/* i915_drv.c -- i830,i845,i855,i865,i915 driver -*- linux-c -*-
 */
/*
 *
 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

#include <linux/acpi.h>
#include <linux/device.h>
#include <linux/oom.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/pnp.h>
#include <linux/slab.h>
#include <linux/vgaarb.h>
#include <linux/vga_switcheroo.h>
#include <linux/vt.h>
#include <acpi/video.h>

#include <drm/drm_atomic_helper.h>
#include <drm/drm_ioctl.h>
#include <drm/drm_irq.h>
#include <drm/drm_probe_helper.h>
#include <drm/i915_drm.h>

#include "i915_drv.h"
#include "i915_trace.h"
#include "i915_pmu.h"
#include "i915_reset.h"
#include "i915_query.h"
#include "i915_vgpu.h"
#include "intel_drv.h"
#include "intel_uc.h"
#include "intel_workarounds.h"

static struct drm_driver driver;

#if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
static unsigned int i915_load_fail_count;

bool __i915_inject_load_failure(const char *func, int line)
{
        if (i915_load_fail_count >= i915_modparams.inject_load_failure)
                return false;

        if (++i915_load_fail_count == i915_modparams.inject_load_failure) {
                DRM_INFO("Injecting failure at checkpoint %u [%s:%d]\n",
                         i915_modparams.inject_load_failure, func, line);
                i915_modparams.inject_load_failure = 0;
                return true;
        }

        return false;
}

bool i915_error_injected(void)
{
        return i915_load_fail_count && !i915_modparams.inject_load_failure;
}

#endif

#define FDO_BUG_URL "https://bugs.freedesktop.org/enter_bug.cgi?product=DRI"
#define FDO_BUG_MSG "Please file a bug at " FDO_BUG_URL " against DRM/Intel " \
                    "providing the dmesg log by booting with drm.debug=0xf"

void
__i915_printk(struct drm_i915_private *dev_priv, const char *level,
              const char *fmt, ...)
{
        static bool shown_bug_once;
        struct device *kdev = dev_priv->drm.dev;
        bool is_error = level[1] <= KERN_ERR[1];
        bool is_debug = level[1] == KERN_DEBUG[1];
        struct va_format vaf;
        va_list args;

        if (is_debug && !(drm_debug & DRM_UT_DRIVER))
                return;

        va_start(args, fmt);

        vaf.fmt = fmt;
        vaf.va = &args;

        if (is_error)
                dev_printk(level, kdev, "%pV", &vaf);
        else
                dev_printk(level, kdev, "[" DRM_NAME ":%ps] %pV",
                           __builtin_return_address(0), &vaf);

        va_end(args);

        if (is_error && !shown_bug_once) {
                /*
                 * Ask the user to file a bug report for the error, except
                 * if they may have caused the bug by fiddling with unsafe
                 * module parameters.
                 */
                if (!test_taint(TAINT_USER))
                        dev_notice(kdev, "%s", FDO_BUG_MSG);
                shown_bug_once = true;
        }
}

/* Map PCH device id to PCH type, or PCH_NONE if unknown. */
static enum intel_pch
intel_pch_type(const struct drm_i915_private *dev_priv, unsigned short id)
{
        switch (id) {
        case INTEL_PCH_IBX_DEVICE_ID_TYPE:
                DRM_DEBUG_KMS("Found Ibex Peak PCH\n");
                WARN_ON(!IS_GEN(dev_priv, 5));
                return PCH_IBX;
        case INTEL_PCH_CPT_DEVICE_ID_TYPE:
                DRM_DEBUG_KMS("Found CougarPoint PCH\n");
                WARN_ON(!IS_GEN(dev_priv, 6) && !IS_IVYBRIDGE(dev_priv));
                return PCH_CPT;
        case INTEL_PCH_PPT_DEVICE_ID_TYPE:
                DRM_DEBUG_KMS("Found PantherPoint PCH\n");
                WARN_ON(!IS_GEN(dev_priv, 6) && !IS_IVYBRIDGE(dev_priv));
                /* PantherPoint is CPT compatible */
                return PCH_CPT;
        case INTEL_PCH_LPT_DEVICE_ID_TYPE:
                DRM_DEBUG_KMS("Found LynxPoint PCH\n");
                WARN_ON(!IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
                WARN_ON(IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv));
                return PCH_LPT;
        case INTEL_PCH_LPT_LP_DEVICE_ID_TYPE:
                DRM_DEBUG_KMS("Found LynxPoint LP PCH\n");
                WARN_ON(!IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
                WARN_ON(!IS_HSW_ULT(dev_priv) && !IS_BDW_ULT(dev_priv));
                return PCH_LPT;
        case INTEL_PCH_WPT_DEVICE_ID_TYPE:
                DRM_DEBUG_KMS("Found WildcatPoint PCH\n");
                WARN_ON(!IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
                WARN_ON(IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv));
                /* WildcatPoint is LPT compatible */
                return PCH_LPT;
        case INTEL_PCH_WPT_LP_DEVICE_ID_TYPE:
                DRM_DEBUG_KMS("Found WildcatPoint LP PCH\n");
                WARN_ON(!IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
                WARN_ON(!IS_HSW_ULT(dev_priv) && !IS_BDW_ULT(dev_priv));
                /* WildcatPoint is LPT compatible */
                return PCH_LPT;
        case INTEL_PCH_SPT_DEVICE_ID_TYPE:
                DRM_DEBUG_KMS("Found SunrisePoint PCH\n");
                WARN_ON(!IS_SKYLAKE(dev_priv) && !IS_KABYLAKE(dev_priv));
                return PCH_SPT;
        case INTEL_PCH_SPT_LP_DEVICE_ID_TYPE:
                DRM_DEBUG_KMS("Found SunrisePoint LP PCH\n");
                WARN_ON(!IS_SKYLAKE(dev_priv) && !IS_KABYLAKE(dev_priv));
                return PCH_SPT;
        case INTEL_PCH_KBP_DEVICE_ID_TYPE:
                DRM_DEBUG_KMS("Found Kaby Lake PCH (KBP)\n");
                WARN_ON(!IS_SKYLAKE(dev_priv) && !IS_KABYLAKE(dev_priv) &&
                        !IS_COFFEELAKE(dev_priv));
                return PCH_KBP;
        case INTEL_PCH_CNP_DEVICE_ID_TYPE:
                DRM_DEBUG_KMS("Found Cannon Lake PCH (CNP)\n");
                WARN_ON(!IS_CANNONLAKE(dev_priv) && !IS_COFFEELAKE(dev_priv));
                return PCH_CNP;
        case INTEL_PCH_CNP_LP_DEVICE_ID_TYPE:
                DRM_DEBUG_KMS("Found Cannon Lake LP PCH (CNP-LP)\n");
                WARN_ON(!IS_CANNONLAKE(dev_priv) && !IS_COFFEELAKE(dev_priv));
                return PCH_CNP;
        case INTEL_PCH_ICP_DEVICE_ID_TYPE:
                DRM_DEBUG_KMS("Found Ice Lake PCH\n");
                WARN_ON(!IS_ICELAKE(dev_priv));
                return PCH_ICP;
        default:
                return PCH_NONE;
        }
}

static bool intel_is_virt_pch(unsigned short id,
                              unsigned short svendor, unsigned short sdevice)
{
        return (id == INTEL_PCH_P2X_DEVICE_ID_TYPE ||
                id == INTEL_PCH_P3X_DEVICE_ID_TYPE ||
                (id == INTEL_PCH_QEMU_DEVICE_ID_TYPE &&
                 svendor == PCI_SUBVENDOR_ID_REDHAT_QUMRANET &&
                 sdevice == PCI_SUBDEVICE_ID_QEMU));
}

static unsigned short
intel_virt_detect_pch(const struct drm_i915_private *dev_priv)
{
        unsigned short id = 0;

        /*
         * In a virtualized passthrough environment we can be in a
         * setup where the ISA bridge is not able to be passed through.
         * In this case, a south bridge can be emulated and we have to
         * make an educated guess as to which PCH is really there.
         */

        if (IS_GEN(dev_priv, 5))
                id = INTEL_PCH_IBX_DEVICE_ID_TYPE;
        else if (IS_GEN(dev_priv, 6) || IS_IVYBRIDGE(dev_priv))
                id = INTEL_PCH_CPT_DEVICE_ID_TYPE;
        else if (IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv))
                id = INTEL_PCH_LPT_LP_DEVICE_ID_TYPE;
        else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
                id = INTEL_PCH_LPT_DEVICE_ID_TYPE;
        else if (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv))
                id = INTEL_PCH_SPT_DEVICE_ID_TYPE;
        else if (IS_COFFEELAKE(dev_priv) || IS_CANNONLAKE(dev_priv))
                id = INTEL_PCH_CNP_DEVICE_ID_TYPE;
        else if (IS_ICELAKE(dev_priv))
                id = INTEL_PCH_ICP_DEVICE_ID_TYPE;

        if (id)
                DRM_DEBUG_KMS("Assuming PCH ID %04x\n", id);
        else
                DRM_DEBUG_KMS("Assuming no PCH\n");

        return id;
}

static void intel_detect_pch(struct drm_i915_private *dev_priv)
{
        struct pci_dev *pch = NULL;

        /*
         * The reason to probe ISA bridge instead of Dev31:Fun0 is to
         * make graphics device passthrough work easy for VMM, that only
         * need to expose ISA bridge to let driver know the real hardware
         * underneath. This is a requirement from virtualization team.
         *
         * In some virtualized environments (e.g. XEN), there is irrelevant
         * ISA bridge in the system. To work reliably, we should scan trhough
         * all the ISA bridge devices and check for the first match, instead
         * of only checking the first one.
         */
        while ((pch = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, pch))) {
                unsigned short id;
                enum intel_pch pch_type;

                if (pch->vendor != PCI_VENDOR_ID_INTEL)
                        continue;

                id = pch->device & INTEL_PCH_DEVICE_ID_MASK;

                pch_type = intel_pch_type(dev_priv, id);
                if (pch_type != PCH_NONE) {
                        dev_priv->pch_type = pch_type;
                        dev_priv->pch_id = id;
                        break;
                } else if (intel_is_virt_pch(id, pch->subsystem_vendor,
                                         pch->subsystem_device)) {
                        id = intel_virt_detect_pch(dev_priv);
                        pch_type = intel_pch_type(dev_priv, id);

                        /* Sanity check virtual PCH id */
                        if (WARN_ON(id && pch_type == PCH_NONE))
                                id = 0;

                        dev_priv->pch_type = pch_type;
                        dev_priv->pch_id = id;
                        break;
                }
        }

        /*
         * Use PCH_NOP (PCH but no South Display) for PCH platforms without
         * display.
         */
        if (pch && !HAS_DISPLAY(dev_priv)) {
                DRM_DEBUG_KMS("Display disabled, reverting to NOP PCH\n");
                dev_priv->pch_type = PCH_NOP;
                dev_priv->pch_id = 0;
        }

        if (!pch)
                DRM_DEBUG_KMS("No PCH found.\n");

        pci_dev_put(pch);
}

static int i915_getparam_ioctl(struct drm_device *dev, void *data,
                               struct drm_file *file_priv)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct pci_dev *pdev = dev_priv->drm.pdev;
        drm_i915_getparam_t *param = data;
        int value;

        switch (param->param) {
        case I915_PARAM_IRQ_ACTIVE:
        case I915_PARAM_ALLOW_BATCHBUFFER:
        case I915_PARAM_LAST_DISPATCH:
        case I915_PARAM_HAS_EXEC_CONSTANTS:
                /* Reject all old ums/dri params. */
                return -ENODEV;
        case I915_PARAM_CHIPSET_ID:
                value = pdev->device;
                break;
        case I915_PARAM_REVISION:
                value = pdev->revision;
                break;
        case I915_PARAM_NUM_FENCES_AVAIL:
                value = dev_priv->num_fence_regs;
                break;
        case I915_PARAM_HAS_OVERLAY:
                value = dev_priv->overlay ? 1 : 0;
                break;
        case I915_PARAM_HAS_BSD:
                value = !!dev_priv->engine[VCS];
                break;
        case I915_PARAM_HAS_BLT:
                value = !!dev_priv->engine[BCS];
                break;
        case I915_PARAM_HAS_VEBOX:
                value = !!dev_priv->engine[VECS];
                break;
        case I915_PARAM_HAS_BSD2:
                value = !!dev_priv->engine[VCS2];
                break;
        case I915_PARAM_HAS_LLC:
                value = HAS_LLC(dev_priv);
                break;
        case I915_PARAM_HAS_WT:
                value = HAS_WT(dev_priv);
                break;
        case I915_PARAM_HAS_ALIASING_PPGTT:
                value = min_t(int, INTEL_PPGTT(dev_priv), I915_GEM_PPGTT_FULL);
                break;
        case I915_PARAM_HAS_SEMAPHORES:
                value = 0;
                break;
        case I915_PARAM_HAS_SECURE_BATCHES:
                value = capable(CAP_SYS_ADMIN);
                break;
        case I915_PARAM_CMD_PARSER_VERSION:
                value = i915_cmd_parser_get_version(dev_priv);
                break;
        case I915_PARAM_SUBSLICE_TOTAL:
                value = sseu_subslice_total(&RUNTIME_INFO(dev_priv)->sseu);
                if (!value)
                        return -ENODEV;
                break;
        case I915_PARAM_EU_TOTAL:
                value = RUNTIME_INFO(dev_priv)->sseu.eu_total;
                if (!value)
                        return -ENODEV;
                break;
        case I915_PARAM_HAS_GPU_RESET:
                value = i915_modparams.enable_hangcheck &&
                        intel_has_gpu_reset(dev_priv);
                if (value && intel_has_reset_engine(dev_priv))
                        value = 2;
                break;
        case I915_PARAM_HAS_RESOURCE_STREAMER:
                value = 0;
                break;
        case I915_PARAM_HAS_POOLED_EU:
                value = HAS_POOLED_EU(dev_priv);
                break;
        case I915_PARAM_MIN_EU_IN_POOL:
                value = RUNTIME_INFO(dev_priv)->sseu.min_eu_in_pool;
                break;
        case I915_PARAM_HUC_STATUS:
                value = intel_huc_check_status(&dev_priv->huc);
                if (value < 0)
                        return value;
                break;
        case I915_PARAM_MMAP_GTT_VERSION:
                /* Though we've started our numbering from 1, and so class all
                 * earlier versions as 0, in effect their value is undefined as
                 * the ioctl will report EINVAL for the unknown param!
                 */
                value = i915_gem_mmap_gtt_version();
                break;
        case I915_PARAM_HAS_SCHEDULER:
                value = dev_priv->caps.scheduler;
                break;

        case I915_PARAM_MMAP_VERSION:
                /* Remember to bump this if the version changes! */
        case I915_PARAM_HAS_GEM:
        case I915_PARAM_HAS_PAGEFLIPPING:
        case I915_PARAM_HAS_EXECBUF2: /* depends on GEM */
        case I915_PARAM_HAS_RELAXED_FENCING:
        case I915_PARAM_HAS_COHERENT_RINGS:
        case I915_PARAM_HAS_RELAXED_DELTA:
        case I915_PARAM_HAS_GEN7_SOL_RESET:
        case I915_PARAM_HAS_WAIT_TIMEOUT:
        case I915_PARAM_HAS_PRIME_VMAP_FLUSH:
        case I915_PARAM_HAS_PINNED_BATCHES:
        case I915_PARAM_HAS_EXEC_NO_RELOC:
        case I915_PARAM_HAS_EXEC_HANDLE_LUT:
        case I915_PARAM_HAS_COHERENT_PHYS_GTT:
        case I915_PARAM_HAS_EXEC_SOFTPIN:
        case I915_PARAM_HAS_EXEC_ASYNC:
        case I915_PARAM_HAS_EXEC_FENCE:
        case I915_PARAM_HAS_EXEC_CAPTURE:
        case I915_PARAM_HAS_EXEC_BATCH_FIRST:
        case I915_PARAM_HAS_EXEC_FENCE_ARRAY:
                /* For the time being all of these are always true;
                 * if some supported hardware does not have one of these
                 * features this value needs to be provided from
                 * INTEL_INFO(), a feature macro, or similar.
                 */
                value = 1;
                break;
        case I915_PARAM_HAS_CONTEXT_ISOLATION:
                value = intel_engines_has_context_isolation(dev_priv);
                break;
        case I915_PARAM_SLICE_MASK:
                value = RUNTIME_INFO(dev_priv)->sseu.slice_mask;
                if (!value)
                        return -ENODEV;
                break;
        case I915_PARAM_SUBSLICE_MASK:
                value = RUNTIME_INFO(dev_priv)->sseu.subslice_mask[0];
                if (!value)
                        return -ENODEV;
                break;
        case I915_PARAM_CS_TIMESTAMP_FREQUENCY:
                value = 1000 * RUNTIME_INFO(dev_priv)->cs_timestamp_frequency_khz;
                break;
        case I915_PARAM_MMAP_GTT_COHERENT:
                value = INTEL_INFO(dev_priv)->has_coherent_ggtt;
                break;
        default:
                DRM_DEBUG("Unknown parameter %d\n", param->param);
                return -EINVAL;
        }

        if (put_user(value, param->value))
                return -EFAULT;

        return 0;
}

static int i915_get_bridge_dev(struct drm_i915_private *dev_priv)
{
        int domain = pci_domain_nr(dev_priv->drm.pdev->bus);

        dev_priv->bridge_dev =
                pci_get_domain_bus_and_slot(domain, 0, PCI_DEVFN(0, 0));
        if (!dev_priv->bridge_dev) {
                DRM_ERROR("bridge device not found\n");
                return -1;
        }
        return 0;
}

/* Allocate space for the MCH regs if needed, return nonzero on error */
static int
intel_alloc_mchbar_resource(struct drm_i915_private *dev_priv)
{
        int reg = INTEL_GEN(dev_priv) >= 4 ? MCHBAR_I965 : MCHBAR_I915;
        u32 temp_lo, temp_hi = 0;
        u64 mchbar_addr;
        int ret;

        if (INTEL_GEN(dev_priv) >= 4)
                pci_read_config_dword(dev_priv->bridge_dev, reg + 4, &temp_hi);
        pci_read_config_dword(dev_priv->bridge_dev, reg, &temp_lo);
        mchbar_addr = ((u64)temp_hi << 32) | temp_lo;

        /* If ACPI doesn't have it, assume we need to allocate it ourselves */
#ifdef CONFIG_PNP
        if (mchbar_addr &&
            pnp_range_reserved(mchbar_addr, mchbar_addr + MCHBAR_SIZE))
                return 0;
#endif

        /* Get some space for it */
        dev_priv->mch_res.name = "i915 MCHBAR";
        dev_priv->mch_res.flags = IORESOURCE_MEM;
        ret = pci_bus_alloc_resource(dev_priv->bridge_dev->bus,
                                     &dev_priv->mch_res,
                                     MCHBAR_SIZE, MCHBAR_SIZE,
                                     PCIBIOS_MIN_MEM,
                                     0, pcibios_align_resource,
                                     dev_priv->bridge_dev);
        if (ret) {
                DRM_DEBUG_DRIVER("failed bus alloc: %d\n", ret);
                dev_priv->mch_res.start = 0;
                return ret;
        }

        if (INTEL_GEN(dev_priv) >= 4)
                pci_write_config_dword(dev_priv->bridge_dev, reg + 4,
                                       upper_32_bits(dev_priv->mch_res.start));

        pci_write_config_dword(dev_priv->bridge_dev, reg,
                               lower_32_bits(dev_priv->mch_res.start));
        return 0;
}

/* Setup MCHBAR if possible, return true if we should disable it again */
static void
intel_setup_mchbar(struct drm_i915_private *dev_priv)
{
        int mchbar_reg = INTEL_GEN(dev_priv) >= 4 ? MCHBAR_I965 : MCHBAR_I915;
        u32 temp;
        bool enabled;

        if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
                return;

        dev_priv->mchbar_need_disable = false;

        if (IS_I915G(dev_priv) || IS_I915GM(dev_priv)) {
                pci_read_config_dword(dev_priv->bridge_dev, DEVEN, &temp);
                enabled = !!(temp & DEVEN_MCHBAR_EN);
        } else {
                pci_read_config_dword(dev_priv->bridge_dev, mchbar_reg, &temp);
                enabled = temp & 1;
        }

        /* If it's already enabled, don't have to do anything */
        if (enabled)
                return;

        if (intel_alloc_mchbar_resource(dev_priv))
                return;

        dev_priv->mchbar_need_disable = true;

        /* Space is allocated or reserved, so enable it. */
        if (IS_I915G(dev_priv) || IS_I915GM(dev_priv)) {
                pci_write_config_dword(dev_priv->bridge_dev, DEVEN,
                                       temp | DEVEN_MCHBAR_EN);
        } else {
                pci_read_config_dword(dev_priv->bridge_dev, mchbar_reg, &temp);
                pci_write_config_dword(dev_priv->bridge_dev, mchbar_reg, temp | 1);
        }
}

static void
intel_teardown_mchbar(struct drm_i915_private *dev_priv)
{
        int mchbar_reg = INTEL_GEN(dev_priv) >= 4 ? MCHBAR_I965 : MCHBAR_I915;

        if (dev_priv->mchbar_need_disable) {
                if (IS_I915G(dev_priv) || IS_I915GM(dev_priv)) {
                        u32 deven_val;

                        pci_read_config_dword(dev_priv->bridge_dev, DEVEN,
                                              &deven_val);
                        deven_val &= ~DEVEN_MCHBAR_EN;
                        pci_write_config_dword(dev_priv->bridge_dev, DEVEN,
                                               deven_val);
                } else {
                        u32 mchbar_val;

                        pci_read_config_dword(dev_priv->bridge_dev, mchbar_reg,
                                              &mchbar_val);
                        mchbar_val &= ~1;
                        pci_write_config_dword(dev_priv->bridge_dev, mchbar_reg,
                                               mchbar_val);
                }
        }

        if (dev_priv->mch_res.start)
                release_resource(&dev_priv->mch_res);
}

/* true = enable decode, false = disable decoder */
static unsigned int i915_vga_set_decode(void *cookie, bool state)
{
        struct drm_i915_private *dev_priv = cookie;

        intel_modeset_vga_set_state(dev_priv, state);
        if (state)
                return VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM |
                       VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
        else
                return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
}

static int i915_resume_switcheroo(struct drm_device *dev);
static int i915_suspend_switcheroo(struct drm_device *dev, pm_message_t state);

static void i915_switcheroo_set_state(struct pci_dev *pdev, enum vga_switcheroo_state state)
{
        struct drm_device *dev = pci_get_drvdata(pdev);
        pm_message_t pmm = { .event = PM_EVENT_SUSPEND };

        if (state == VGA_SWITCHEROO_ON) {
                pr_info("switched on\n");
                dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
                /* i915 resume handler doesn't set to D0 */
                pci_set_power_state(pdev, PCI_D0);
                i915_resume_switcheroo(dev);
                dev->switch_power_state = DRM_SWITCH_POWER_ON;
        } else {
                pr_info("switched off\n");
                dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
                i915_suspend_switcheroo(dev, pmm);
                dev->switch_power_state = DRM_SWITCH_POWER_OFF;
        }
}

static bool i915_switcheroo_can_switch(struct pci_dev *pdev)
{
        struct drm_device *dev = pci_get_drvdata(pdev);

        /*
         * FIXME: open_count is protected by drm_global_mutex but that would lead to
         * locking inversion with the driver load path. And the access here is
         * completely racy anyway. So don't bother with locking for now.
         */
        return dev->open_count == 0;
}

static const struct vga_switcheroo_client_ops i915_switcheroo_ops = {
        .set_gpu_state = i915_switcheroo_set_state,
        .reprobe = NULL,
        .can_switch = i915_switcheroo_can_switch,
};

static int i915_load_modeset_init(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct pci_dev *pdev = dev_priv->drm.pdev;
        int ret;

        if (i915_inject_load_failure())
                return -ENODEV;

        if (HAS_DISPLAY(dev_priv)) {
                ret = drm_vblank_init(&dev_priv->drm,
                                      INTEL_INFO(dev_priv)->num_pipes);
                if (ret)
                        goto out;
        }

        intel_bios_init(dev_priv);

        /* If we have > 1 VGA cards, then we need to arbitrate access
         * to the common VGA resources.
         *
         * If we are a secondary display controller (!PCI_DISPLAY_CLASS_VGA),
         * then we do not take part in VGA arbitration and the
         * vga_client_register() fails with -ENODEV.
         */
        ret = vga_client_register(pdev, dev_priv, NULL, i915_vga_set_decode);
        if (ret && ret != -ENODEV)
                goto out;

        intel_register_dsm_handler();

        ret = vga_switcheroo_register_client(pdev, &i915_switcheroo_ops, false);
        if (ret)
                goto cleanup_vga_client;

        /* must happen before intel_power_domains_init_hw() on VLV/CHV */
        intel_update_rawclk(dev_priv);

        intel_power_domains_init_hw(dev_priv, false);

        intel_csr_ucode_init(dev_priv);

        ret = intel_irq_install(dev_priv);
        if (ret)
                goto cleanup_csr;

        intel_setup_gmbus(dev_priv);

        /* Important: The output setup functions called by modeset_init need
         * working irqs for e.g. gmbus and dp aux transfers. */
        ret = intel_modeset_init(dev);
        if (ret)
                goto cleanup_irq;

        ret = i915_gem_init(dev_priv);
        if (ret)
                goto cleanup_modeset;

        intel_overlay_setup(dev_priv);

        if (!HAS_DISPLAY(dev_priv))
                return 0;

        ret = intel_fbdev_init(dev);
        if (ret)
                goto cleanup_gem;

        /* Only enable hotplug handling once the fbdev is fully set up. */
        intel_hpd_init(dev_priv);

        intel_init_ipc(dev_priv);

        return 0;

cleanup_gem:
        if (i915_gem_suspend(dev_priv))
                DRM_ERROR("failed to idle hardware; continuing to unload!\n");
        i915_gem_fini(dev_priv);
cleanup_modeset:
        intel_modeset_cleanup(dev);
cleanup_irq:
        drm_irq_uninstall(dev);
        intel_teardown_gmbus(dev_priv);
cleanup_csr:
        intel_csr_ucode_fini(dev_priv);
        intel_power_domains_fini_hw(dev_priv);
        vga_switcheroo_unregister_client(pdev);
cleanup_vga_client:
        vga_client_register(pdev, NULL, NULL, NULL);
out:
        return ret;
}

static int i915_kick_out_firmware_fb(struct drm_i915_private *dev_priv)
{
        struct apertures_struct *ap;
        struct pci_dev *pdev = dev_priv->drm.pdev;
        struct i915_ggtt *ggtt = &dev_priv->ggtt;
        bool primary;
        int ret;

        ap = alloc_apertures(1);
        if (!ap)
                return -ENOMEM;

        ap->ranges[0].base = ggtt->gmadr.start;
        ap->ranges[0].size = ggtt->mappable_end;

        primary =
                pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW;

        ret = drm_fb_helper_remove_conflicting_framebuffers(ap, "inteldrmfb", primary);

        kfree(ap);

        return ret;
}

static void intel_init_dpio(struct drm_i915_private *dev_priv)
{
        /*
         * IOSF_PORT_DPIO is used for VLV x2 PHY (DP/HDMI B and C),
         * CHV x1 PHY (DP/HDMI D)
         * IOSF_PORT_DPIO_2 is used for CHV x2 PHY (DP/HDMI B and C)
         */
        if (IS_CHERRYVIEW(dev_priv)) {
                DPIO_PHY_IOSF_PORT(DPIO_PHY0) = IOSF_PORT_DPIO_2;
                DPIO_PHY_IOSF_PORT(DPIO_PHY1) = IOSF_PORT_DPIO;
        } else if (IS_VALLEYVIEW(dev_priv)) {
                DPIO_PHY_IOSF_PORT(DPIO_PHY0) = IOSF_PORT_DPIO;
        }
}

static int i915_workqueues_init(struct drm_i915_private *dev_priv)
{
        /*
         * The i915 workqueue is primarily used for batched retirement of
         * requests (and thus managing bo) once the task has been completed
         * by the GPU. i915_retire_requests() is called directly when we
         * need high-priority retirement, such as waiting for an explicit
         * bo.
         *
         * It is also used for periodic low-priority events, such as
         * idle-timers and recording error state.
         *
         * All tasks on the workqueue are expected to acquire the dev mutex
         * so there is no point in running more than one instance of the
         * workqueue at any time.  Use an ordered one.
         */
        dev_priv->wq = alloc_ordered_workqueue("i915", 0);
        if (dev_priv->wq == NULL)
                goto out_err;

        dev_priv->hotplug.dp_wq = alloc_ordered_workqueue("i915-dp", 0);
        if (dev_priv->hotplug.dp_wq == NULL)
                goto out_free_wq;

        return 0;

out_free_wq:
        destroy_workqueue(dev_priv->wq);
out_err:
        DRM_ERROR("Failed to allocate workqueues.\n");

        return -ENOMEM;
}

static void i915_engines_cleanup(struct drm_i915_private *i915)
{
        struct intel_engine_cs *engine;
        enum intel_engine_id id;

        for_each_engine(engine, i915, id)
                kfree(engine);
}

static void i915_workqueues_cleanup(struct drm_i915_private *dev_priv)
{
        destroy_workqueue(dev_priv->hotplug.dp_wq);
        destroy_workqueue(dev_priv->wq);
}

/*
 * We don't keep the workarounds for pre-production hardware, so we expect our
 * driver to fail on these machines in one way or another. A little warning on
 * dmesg may help both the user and the bug triagers.
 *
 * Our policy for removing pre-production workarounds is to keep the
 * current gen workarounds as a guide to the bring-up of the next gen
 * (workarounds have a habit of persisting!). Anything older than that
 * should be removed along with the complications they introduce.
 */
static void intel_detect_preproduction_hw(struct drm_i915_private *dev_priv)
{
        bool pre = false;

        pre |= IS_HSW_EARLY_SDV(dev_priv);
        pre |= IS_SKL_REVID(dev_priv, 0, SKL_REVID_F0);
        pre |= IS_BXT_REVID(dev_priv, 0, BXT_REVID_B_LAST);
        pre |= IS_KBL_REVID(dev_priv, 0, KBL_REVID_A0);

        if (pre) {
                DRM_ERROR("This is a pre-production stepping. "
                          "It may not be fully functional.\n");
                add_taint(TAINT_MACHINE_CHECK, LOCKDEP_STILL_OK);
        }
}

/**
 * i915_driver_init_early - setup state not requiring device access
 * @dev_priv: device private
 *
 * Initialize everything that is a "SW-only" state, that is state not
 * requiring accessing the device or exposing the driver via kernel internal
 * or userspace interfaces. Example steps belonging here: lock initialization,
 * system memory allocation, setting up device specific attributes and
 * function hooks not requiring accessing the device.
 */
static int i915_driver_init_early(struct drm_i915_private *dev_priv)
{
        int ret = 0;

        if (i915_inject_load_failure())
                return -ENODEV;

        spin_lock_init(&dev_priv->irq_lock);
        spin_lock_init(&dev_priv->gpu_error.lock);
        mutex_init(&dev_priv->backlight_lock);
        spin_lock_init(&dev_priv->uncore.lock);

        mutex_init(&dev_priv->sb_lock);
        mutex_init(&dev_priv->av_mutex);
        mutex_init(&dev_priv->wm.wm_mutex);
        mutex_init(&dev_priv->pps_mutex);

        i915_memcpy_init_early(dev_priv);
        intel_runtime_pm_init_early(dev_priv);

        ret = i915_workqueues_init(dev_priv);
        if (ret < 0)
                goto err_engines;

        ret = i915_gem_init_early(dev_priv);
        if (ret < 0)
                goto err_workqueues;

        /* This must be called before any calls to HAS_PCH_* */
        intel_detect_pch(dev_priv);

        intel_wopcm_init_early(&dev_priv->wopcm);
        intel_uc_init_early(dev_priv);
        intel_pm_setup(dev_priv);
        intel_init_dpio(dev_priv);
        ret = intel_power_domains_init(dev_priv);
        if (ret < 0)
                goto err_uc;
        intel_irq_init(dev_priv);
        intel_hangcheck_init(dev_priv);
        intel_init_display_hooks(dev_priv);
        intel_init_clock_gating_hooks(dev_priv);
        intel_init_audio_hooks(dev_priv);
        intel_display_crc_init(dev_priv);

        intel_detect_preproduction_hw(dev_priv);

        return 0;

err_uc:
        intel_uc_cleanup_early(dev_priv);
        i915_gem_cleanup_early(dev_priv);
err_workqueues:
        i915_workqueues_cleanup(dev_priv);
err_engines:
        i915_engines_cleanup(dev_priv);
        return ret;
}

/**
 * i915_driver_cleanup_early - cleanup the setup done in i915_driver_init_early()
 * @dev_priv: device private
 */
static void i915_driver_cleanup_early(struct drm_i915_private *dev_priv)
{
        intel_irq_fini(dev_priv);
        intel_power_domains_cleanup(dev_priv);
        intel_uc_cleanup_early(dev_priv);
        i915_gem_cleanup_early(dev_priv);
        i915_workqueues_cleanup(dev_priv);
        i915_engines_cleanup(dev_priv);
}

static int i915_mmio_setup(struct drm_i915_private *dev_priv)
{
        struct pci_dev *pdev = dev_priv->drm.pdev;
        int mmio_bar;
        int mmio_size;

        mmio_bar = IS_GEN(dev_priv, 2) ? 1 : 0;
        /*
         * Before gen4, the registers and the GTT are behind different BARs.
         * However, from gen4 onwards, the registers and the GTT are shared
         * in the same BAR, so we want to restrict this ioremap from
         * clobbering the GTT which we want ioremap_wc instead. Fortunately,
         * the register BAR remains the same size for all the earlier
         * generations up to Ironlake.
         */
        if (INTEL_GEN(dev_priv) < 5)
                mmio_size = 512 * 1024;
        else
                mmio_size = 2 * 1024 * 1024;
        dev_priv->regs = pci_iomap(pdev, mmio_bar, mmio_size);
        if (dev_priv->regs == NULL) {
                DRM_ERROR("failed to map registers\n");

                return -EIO;
        }

        /* Try to make sure MCHBAR is enabled before poking at it */
        intel_setup_mchbar(dev_priv);

        return 0;
}

static void i915_mmio_cleanup(struct drm_i915_private *dev_priv)
{
        struct pci_dev *pdev = dev_priv->drm.pdev;

        intel_teardown_mchbar(dev_priv);
        pci_iounmap(pdev, dev_priv->regs);
}

/**
 * i915_driver_init_mmio - setup device MMIO
 * @dev_priv: device private
 *
 * Setup minimal device state necessary for MMIO accesses later in the
 * initialization sequence. The setup here should avoid any other device-wide
 * side effects or exposing the driver via kernel internal or user space
 * interfaces.
 */
static int i915_driver_init_mmio(struct drm_i915_private *dev_priv)
{
        int ret;

        if (i915_inject_load_failure())
                return -ENODEV;

        if (i915_get_bridge_dev(dev_priv))
                return -EIO;

        ret = i915_mmio_setup(dev_priv);
        if (ret < 0)
                goto err_bridge;

        intel_uncore_init(dev_priv);

        intel_device_info_init_mmio(dev_priv);

        intel_uncore_prune(dev_priv);

        intel_uc_init_mmio(dev_priv);

        ret = intel_engines_init_mmio(dev_priv);
        if (ret)
                goto err_uncore;

        i915_gem_init_mmio(dev_priv);

        return 0;

err_uncore:
        intel_uncore_fini(dev_priv);
        i915_mmio_cleanup(dev_priv);
err_bridge:
        pci_dev_put(dev_priv->bridge_dev);

        return ret;
}

/**
 * i915_driver_cleanup_mmio - cleanup the setup done in i915_driver_init_mmio()
 * @dev_priv: device private
 */
static void i915_driver_cleanup_mmio(struct drm_i915_private *dev_priv)
{
        intel_uncore_fini(dev_priv);
        i915_mmio_cleanup(dev_priv);
        pci_dev_put(dev_priv->bridge_dev);
}

static void intel_sanitize_options(struct drm_i915_private *dev_priv)
{
        intel_gvt_sanitize_options(dev_priv);
}

static enum dram_rank skl_get_dimm_rank(u8 size, u32 rank)
{
        if (size == 0)
                return I915_DRAM_RANK_INVALID;
        if (rank == SKL_DRAM_RANK_SINGLE)
                return I915_DRAM_RANK_SINGLE;
        else if (rank == SKL_DRAM_RANK_DUAL)
                return I915_DRAM_RANK_DUAL;

        return I915_DRAM_RANK_INVALID;
}

static bool
skl_is_16gb_dimm(enum dram_rank rank, u8 size, u8 width)
{
        if (rank == I915_DRAM_RANK_SINGLE && width == 8 && size == 16)
                return true;
        else if (rank == I915_DRAM_RANK_DUAL && width == 8 && size == 32)
                return true;
        else if (rank == SKL_DRAM_RANK_SINGLE && width == 16 && size == 8)
                return true;
        else if (rank == SKL_DRAM_RANK_DUAL && width == 16 && size == 16)
                return true;

        return false;
}

static int
skl_dram_get_channel_info(struct dram_channel_info *ch, u32 val)
{
        u32 tmp_l, tmp_s;
        u32 s_val = val >> SKL_DRAM_S_SHIFT;

        if (!val)
                return -EINVAL;

        tmp_l = val & SKL_DRAM_SIZE_MASK;
        tmp_s = s_val & SKL_DRAM_SIZE_MASK;

        if (tmp_l == 0 && tmp_s == 0)
                return -EINVAL;

        ch->l_info.size = tmp_l;
        ch->s_info.size = tmp_s;

        tmp_l = (val & SKL_DRAM_WIDTH_MASK) >> SKL_DRAM_WIDTH_SHIFT;
        tmp_s = (s_val & SKL_DRAM_WIDTH_MASK) >> SKL_DRAM_WIDTH_SHIFT;
        ch->l_info.width = (1 << tmp_l) * 8;
        ch->s_info.width = (1 << tmp_s) * 8;

        tmp_l = val & SKL_DRAM_RANK_MASK;
        tmp_s = s_val & SKL_DRAM_RANK_MASK;
        ch->l_info.rank = skl_get_dimm_rank(ch->l_info.size, tmp_l);
        ch->s_info.rank = skl_get_dimm_rank(ch->s_info.size, tmp_s);

        if (ch->l_info.rank == I915_DRAM_RANK_DUAL ||
            ch->s_info.rank == I915_DRAM_RANK_DUAL)
                ch->rank = I915_DRAM_RANK_DUAL;
        else if (ch->l_info.rank == I915_DRAM_RANK_SINGLE &&
                 ch->s_info.rank == I915_DRAM_RANK_SINGLE)
                ch->rank = I915_DRAM_RANK_DUAL;
        else
                ch->rank = I915_DRAM_RANK_SINGLE;

        ch->is_16gb_dimm = skl_is_16gb_dimm(ch->l_info.rank, ch->l_info.size,
                                            ch->l_info.width) ||
                           skl_is_16gb_dimm(ch->s_info.rank, ch->s_info.size,
                                            ch->s_info.width);

        DRM_DEBUG_KMS("(size:width:rank) L(%dGB:X%d:%s) S(%dGB:X%d:%s)\n",
                      ch->l_info.size, ch->l_info.width,
                      ch->l_info.rank ? "dual" : "single",
                      ch->s_info.size, ch->s_info.width,
                      ch->s_info.rank ? "dual" : "single");

        return 0;
}

static bool
intel_is_dram_symmetric(u32 val_ch0, u32 val_ch1,
                        struct dram_channel_info *ch0)
{
        return (val_ch0 == val_ch1 &&
                (ch0->s_info.size == 0 ||
                 (ch0->l_info.size == ch0->s_info.size &&
                  ch0->l_info.width == ch0->s_info.width &&
                  ch0->l_info.rank == ch0->s_info.rank)));
}

static int
skl_dram_get_channels_info(struct drm_i915_private *dev_priv)
{
        struct dram_info *dram_info = &dev_priv->dram_info;
        struct dram_channel_info ch0, ch1;
        u32 val_ch0, val_ch1;
        int ret;

        val_ch0 = I915_READ(SKL_MAD_DIMM_CH0_0_0_0_MCHBAR_MCMAIN);
        ret = skl_dram_get_channel_info(&ch0, val_ch0);
        if (ret == 0)
                dram_info->num_channels++;

        val_ch1 = I915_READ(SKL_MAD_DIMM_CH1_0_0_0_MCHBAR_MCMAIN);
        ret = skl_dram_get_channel_info(&ch1, val_ch1);
        if (ret == 0)
                dram_info->num_channels++;

        if (dram_info->num_channels == 0) {
                DRM_INFO("Number of memory channels is zero\n");
                return -EINVAL;
        }

        /*
         * If any of the channel is single rank channel, worst case output
         * will be same as if single rank memory, so consider single rank
         * memory.
         */
        if (ch0.rank == I915_DRAM_RANK_SINGLE ||
            ch1.rank == I915_DRAM_RANK_SINGLE)
                dram_info->rank = I915_DRAM_RANK_SINGLE;
        else
                dram_info->rank = max(ch0.rank, ch1.rank);

        if (dram_info->rank == I915_DRAM_RANK_INVALID) {
                DRM_INFO("couldn't get memory rank information\n");
                return -EINVAL;
        }

        dram_info->is_16gb_dimm = ch0.is_16gb_dimm || ch1.is_16gb_dimm;

        dev_priv->dram_info.symmetric_memory = intel_is_dram_symmetric(val_ch0,
                                                                       val_ch1,
                                                                       &ch0);

        DRM_DEBUG_KMS("memory configuration is %sSymmetric memory\n",
                      dev_priv->dram_info.symmetric_memory ? "" : "not ");
        return 0;
}

static int
skl_get_dram_info(struct drm_i915_private *dev_priv)
{
        struct dram_info *dram_info = &dev_priv->dram_info;
        u32 mem_freq_khz, val;
        int ret;

        ret = skl_dram_get_channels_info(dev_priv);
        if (ret)
                return ret;

        val = I915_READ(SKL_MC_BIOS_DATA_0_0_0_MCHBAR_PCU);
        mem_freq_khz = DIV_ROUND_UP((val & SKL_REQ_DATA_MASK) *
                                    SKL_MEMORY_FREQ_MULTIPLIER_HZ, 1000);

        dram_info->bandwidth_kbps = dram_info->num_channels *
                                                        mem_freq_khz * 8;

        if (dram_info->bandwidth_kbps == 0) {
                DRM_INFO("Couldn't get system memory bandwidth\n");
                return -EINVAL;
        }

        dram_info->valid = true;
        return 0;
}

static int
bxt_get_dram_info(struct drm_i915_private *dev_priv)
{
        struct dram_info *dram_info = &dev_priv->dram_info;
        u32 dram_channels;
        u32 mem_freq_khz, val;
        u8 num_active_channels;
        int i;

        val = I915_READ(BXT_P_CR_MC_BIOS_REQ_0_0_0);
        mem_freq_khz = DIV_ROUND_UP((val & BXT_REQ_DATA_MASK) *
                                    BXT_MEMORY_FREQ_MULTIPLIER_HZ, 1000);

        dram_channels = val & BXT_DRAM_CHANNEL_ACTIVE_MASK;
        num_active_channels = hweight32(dram_channels);

        /* Each active bit represents 4-byte channel */
        dram_info->bandwidth_kbps = (mem_freq_khz * num_active_channels * 4);

        if (dram_info->bandwidth_kbps == 0) {
                DRM_INFO("Couldn't get system memory bandwidth\n");
                return -EINVAL;
        }

        /*
         * Now read each DUNIT8/9/10/11 to check the rank of each dimms.
         */
        for (i = BXT_D_CR_DRP0_DUNIT_START; i <= BXT_D_CR_DRP0_DUNIT_END; i++) {
                u8 size, width;
                enum dram_rank rank;
                u32 tmp;

                val = I915_READ(BXT_D_CR_DRP0_DUNIT(i));
                if (val == 0xFFFFFFFF)
                        continue;

                dram_info->num_channels++;
                tmp = val & BXT_DRAM_RANK_MASK;

                if (tmp == BXT_DRAM_RANK_SINGLE)
                        rank = I915_DRAM_RANK_SINGLE;
                else if (tmp == BXT_DRAM_RANK_DUAL)
                        rank = I915_DRAM_RANK_DUAL;
                else
                        rank = I915_DRAM_RANK_INVALID;

                tmp = val & BXT_DRAM_SIZE_MASK;
                if (tmp == BXT_DRAM_SIZE_4GB)
                        size = 4;
                else if (tmp == BXT_DRAM_SIZE_6GB)
                        size = 6;
                else if (tmp == BXT_DRAM_SIZE_8GB)
                        size = 8;
                else if (tmp == BXT_DRAM_SIZE_12GB)
                        size = 12;
                else if (tmp == BXT_DRAM_SIZE_16GB)
                        size = 16;
                else
                        size = 0;

                tmp = (val & BXT_DRAM_WIDTH_MASK) >> BXT_DRAM_WIDTH_SHIFT;
                width = (1 << tmp) * 8;
                DRM_DEBUG_KMS("dram size:%dGB width:X%d rank:%s\n", size,
                              width, rank == I915_DRAM_RANK_SINGLE ? "single" :
                              rank == I915_DRAM_RANK_DUAL ? "dual" : "unknown");

                /*
                 * If any of the channel is single rank channel,
                 * worst case output will be same as if single rank
                 * memory, so consider single rank memory.
                 */
                if (dram_info->rank == I915_DRAM_RANK_INVALID)
                        dram_info->rank = rank;
                else if (rank == I915_DRAM_RANK_SINGLE)
                        dram_info->rank = I915_DRAM_RANK_SINGLE;
        }

        if (dram_info->rank == I915_DRAM_RANK_INVALID) {
                DRM_INFO("couldn't get memory rank information\n");
                return -EINVAL;
        }

        dram_info->valid = true;
        return 0;
}

static void
intel_get_dram_info(struct drm_i915_private *dev_priv)
{
        struct dram_info *dram_info = &dev_priv->dram_info;
        char bandwidth_str[32];
        int ret;

        dram_info->valid = false;
        dram_info->rank = I915_DRAM_RANK_INVALID;
        dram_info->bandwidth_kbps = 0;
        dram_info->num_channels = 0;

        /*
         * Assume 16Gb DIMMs are present until proven otherwise.
         * This is only used for the level 0 watermark latency
         * w/a which does not apply to bxt/glk.
         */
        dram_info->is_16gb_dimm = !IS_GEN9_LP(dev_priv);

        if (INTEL_GEN(dev_priv) < 9 || IS_GEMINILAKE(dev_priv))
                return;

        /* Need to calculate bandwidth only for Gen9 */
        if (IS_BROXTON(dev_priv))
                ret = bxt_get_dram_info(dev_priv);
        else if (IS_GEN(dev_priv, 9))
                ret = skl_get_dram_info(dev_priv);
        else
                ret = skl_dram_get_channels_info(dev_priv);
        if (ret)
                return;

        if (dram_info->bandwidth_kbps)
                sprintf(bandwidth_str, "%d KBps", dram_info->bandwidth_kbps);
        else
                sprintf(bandwidth_str, "unknown");
        DRM_DEBUG_KMS("DRAM bandwidth:%s, total-channels: %u\n",
                      bandwidth_str, dram_info->num_channels);
        DRM_DEBUG_KMS("DRAM rank: %s rank 16GB-dimm:%s\n",
                      (dram_info->rank == I915_DRAM_RANK_DUAL) ?
                      "dual" : "single", yesno(dram_info->is_16gb_dimm));
}

/**
 * i915_driver_init_hw - setup state requiring device access
 * @dev_priv: device private
 *
 * Setup state that requires accessing the device, but doesn't require
 * exposing the driver via kernel internal or userspace interfaces.
 */
static int i915_driver_init_hw(struct drm_i915_private *dev_priv)
{
        struct pci_dev *pdev = dev_priv->drm.pdev;
        int ret;

        if (i915_inject_load_failure())
                return -ENODEV;

        intel_device_info_runtime_init(dev_priv);

        if (HAS_PPGTT(dev_priv)) {
                if (intel_vgpu_active(dev_priv) &&
                    !intel_vgpu_has_full_48bit_ppgtt(dev_priv)) {
                        i915_report_error(dev_priv,
                                          "incompatible vGPU found, support for isolated ppGTT required\n");
                        return -ENXIO;
                }
        }

        if (HAS_EXECLISTS(dev_priv)) {
                /*
                 * Older GVT emulation depends upon intercepting CSB mmio,
                 * which we no longer use, preferring to use the HWSP cache
                 * instead.
                 */
                if (intel_vgpu_active(dev_priv) &&
                    !intel_vgpu_has_hwsp_emulation(dev_priv)) {
                        i915_report_error(dev_priv,
                                          "old vGPU host found, support for HWSP emulation required\n");
                        return -ENXIO;
                }
        }

        intel_sanitize_options(dev_priv);

        i915_perf_init(dev_priv);

        ret = i915_ggtt_probe_hw(dev_priv);
        if (ret)
                goto err_perf;

        /*
         * WARNING: Apparently we must kick fbdev drivers before vgacon,
         * otherwise the vga fbdev driver falls over.
         */
        ret = i915_kick_out_firmware_fb(dev_priv);
        if (ret) {
                DRM_ERROR("failed to remove conflicting framebuffer drivers\n");
                goto err_ggtt;
        }

        ret = vga_remove_vgacon(pdev);
        if (ret) {
                DRM_ERROR("failed to remove conflicting VGA console\n");
                goto err_ggtt;
        }

        ret = i915_ggtt_init_hw(dev_priv);
        if (ret)
                goto err_ggtt;

        ret = i915_ggtt_enable_hw(dev_priv);
        if (ret) {
                DRM_ERROR("failed to enable GGTT\n");
                goto err_ggtt;
        }

        pci_set_master(pdev);

        /* overlay on gen2 is broken and can't address above 1G */
        if (IS_GEN(dev_priv, 2)) {
                ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(30));
                if (ret) {
                        DRM_ERROR("failed to set DMA mask\n");

                        goto err_ggtt;
                }
        }

        /* 965GM sometimes incorrectly writes to hardware status page (HWS)
         * using 32bit addressing, overwriting memory if HWS is located
         * above 4GB.
         *
         * The documentation also mentions an issue with undefined
         * behaviour if any general state is accessed within a page above 4GB,
         * which also needs to be handled carefully.
         */
        if (IS_I965G(dev_priv) || IS_I965GM(dev_priv)) {
                ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));

                if (ret) {
                        DRM_ERROR("failed to set DMA mask\n");

                        goto err_ggtt;
                }
        }

        pm_qos_add_request(&dev_priv->pm_qos, PM_QOS_CPU_DMA_LATENCY,
                           PM_QOS_DEFAULT_VALUE);

        intel_uncore_sanitize(dev_priv);

        intel_gt_init_workarounds(dev_priv);
        i915_gem_load_init_fences(dev_priv);

        /* On the 945G/GM, the chipset reports the MSI capability on the
         * integrated graphics even though the support isn't actually there
         * according to the published specs.  It doesn't appear to function
         * correctly in testing on 945G.
         * This may be a side effect of MSI having been made available for PEG
         * and the registers being closely associated.
         *
         * According to chipset errata, on the 965GM, MSI interrupts may
         * be lost or delayed, and was defeatured. MSI interrupts seem to
         * get lost on g4x as well, and interrupt delivery seems to stay
         * properly dead afterwards. So we'll just disable them for all
         * pre-gen5 chipsets.
         *
         * dp aux and gmbus irq on gen4 seems to be able to generate legacy
         * interrupts even when in MSI mode. This results in spurious
         * interrupt warnings if the legacy irq no. is shared with another
         * device. The kernel then disables that interrupt source and so
         * prevents the other device from working properly.
         */
        if (INTEL_GEN(dev_priv) >= 5) {
                if (pci_enable_msi(pdev) < 0)
                        DRM_DEBUG_DRIVER("can't enable MSI");
        }

        ret = intel_gvt_init(dev_priv);
        if (ret)
                goto err_msi;

        intel_opregion_setup(dev_priv);
        /*
         * Fill the dram structure to get the system raw bandwidth and
         * dram info. This will be used for memory latency calculation.
         */
        intel_get_dram_info(dev_priv);


        return 0;

err_msi:
        if (pdev->msi_enabled)
                pci_disable_msi(pdev);
        pm_qos_remove_request(&dev_priv->pm_qos);
err_ggtt:
        i915_ggtt_cleanup_hw(dev_priv);
err_perf:
        i915_perf_fini(dev_priv);
        return ret;
}

/**
 * i915_driver_cleanup_hw - cleanup the setup done in i915_driver_init_hw()
 * @dev_priv: device private
 */
static void i915_driver_cleanup_hw(struct drm_i915_private *dev_priv)
{
        struct pci_dev *pdev = dev_priv->drm.pdev;

        i915_perf_fini(dev_priv);

        if (pdev->msi_enabled)
                pci_disable_msi(pdev);

        pm_qos_remove_request(&dev_priv->pm_qos);
        i915_ggtt_cleanup_hw(dev_priv);
}

/**
 * i915_driver_register - register the driver with the rest of the system
 * @dev_priv: device private
 *
 * Perform any steps necessary to make the driver available via kernel
 * internal or userspace interfaces.
 */
static void i915_driver_register(struct drm_i915_private *dev_priv)
{
        struct drm_device *dev = &dev_priv->drm;

        i915_gem_shrinker_register(dev_priv);
        i915_pmu_register(dev_priv);

        /*
         * Notify a valid surface after modesetting,
         * when running inside a VM.
         */
        if (intel_vgpu_active(dev_priv))
                I915_WRITE(vgtif_reg(display_ready), VGT_DRV_DISPLAY_READY);

        /* Reveal our presence to userspace */
        if (drm_dev_register(dev, 0) == 0) {
                i915_debugfs_register(dev_priv);
                i915_setup_sysfs(dev_priv);

                /* Depends on sysfs having been initialized */
                i915_perf_register(dev_priv);
        } else
                DRM_ERROR("Failed to register driver for userspace access!\n");

        if (HAS_DISPLAY(dev_priv)) {
                /* Must be done after probing outputs */
                intel_opregion_register(dev_priv);
                acpi_video_register();
        }

        if (IS_GEN(dev_priv, 5))
                intel_gpu_ips_init(dev_priv);

        intel_audio_init(dev_priv);

        /*
         * Some ports require correctly set-up hpd registers for detection to
         * work properly (leading to ghost connected connector status), e.g. VGA
         * on gm45.  Hence we can only set up the initial fbdev config after hpd
         * irqs are fully enabled. We do it last so that the async config
         * cannot run before the connectors are registered.
         */
        intel_fbdev_initial_config_async(dev);

        /*
         * We need to coordinate the hotplugs with the asynchronous fbdev
         * configuration, for which we use the fbdev->async_cookie.
         */
        if (HAS_DISPLAY(dev_priv))
                drm_kms_helper_poll_init(dev);

        intel_power_domains_enable(dev_priv);
        intel_runtime_pm_enable(dev_priv);
}

/**
 * i915_driver_unregister - cleanup the registration done in i915_driver_regiser()
 * @dev_priv: device private
 */
static void i915_driver_unregister(struct drm_i915_private *dev_priv)
{
        intel_runtime_pm_disable(dev_priv);
        intel_power_domains_disable(dev_priv);

        intel_fbdev_unregister(dev_priv);
        intel_audio_deinit(dev_priv);

        /*
         * After flushing the fbdev (incl. a late async config which will
         * have delayed queuing of a hotplug event), then flush the hotplug
         * events.
         */
        drm_kms_helper_poll_fini(&dev_priv->drm);

        intel_gpu_ips_teardown();
        acpi_video_unregister();
        intel_opregion_unregister(dev_priv);

        i915_perf_unregister(dev_priv);
        i915_pmu_unregister(dev_priv);

        i915_teardown_sysfs(dev_priv);
        drm_dev_unregister(&dev_priv->drm);

        i915_gem_shrinker_unregister(dev_priv);
}

static void i915_welcome_messages(struct drm_i915_private *dev_priv)
{
        if (drm_debug & DRM_UT_DRIVER) {
                struct drm_printer p = drm_debug_printer("i915 device info:");

                drm_printf(&p, "pciid=0x%04x rev=0x%02x platform=%s gen=%i\n",
                           INTEL_DEVID(dev_priv),
                           INTEL_REVID(dev_priv),
                           intel_platform_name(INTEL_INFO(dev_priv)->platform),
                           INTEL_GEN(dev_priv));

                intel_device_info_dump_flags(INTEL_INFO(dev_priv), &p);
                intel_device_info_dump_runtime(RUNTIME_INFO(dev_priv), &p);
        }

        if (IS_ENABLED(CONFIG_DRM_I915_DEBUG))
                DRM_INFO("DRM_I915_DEBUG enabled\n");
        if (IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM))
                DRM_INFO("DRM_I915_DEBUG_GEM enabled\n");
        if (IS_ENABLED(CONFIG_DRM_I915_DEBUG_RUNTIME_PM))
                DRM_INFO("DRM_I915_DEBUG_RUNTIME_PM enabled\n");
}

static struct drm_i915_private *
i915_driver_create(struct pci_dev *pdev, const struct pci_device_id *ent)
{
        const struct intel_device_info *match_info =
                (struct intel_device_info *)ent->driver_data;
        struct intel_device_info *device_info;
        struct drm_i915_private *i915;
        int err;

        i915 = kzalloc(sizeof(*i915), GFP_KERNEL);
        if (!i915)
                return ERR_PTR(-ENOMEM);

        err = drm_dev_init(&i915->drm, &driver, &pdev->dev);
        if (err) {
                kfree(i915);
                return ERR_PTR(err);
        }

        i915->drm.pdev = pdev;
        i915->drm.dev_private = i915;
        pci_set_drvdata(pdev, &i915->drm);

        /* Setup the write-once "constant" device info */
        device_info = mkwrite_device_info(i915);
        memcpy(device_info, match_info, sizeof(*device_info));
        RUNTIME_INFO(i915)->device_id = pdev->device;

        BUILD_BUG_ON(INTEL_MAX_PLATFORMS >
                     BITS_PER_TYPE(device_info->platform_mask));
        BUG_ON(device_info->gen > BITS_PER_TYPE(device_info->gen_mask));

        return i915;
}

static void i915_driver_destroy(struct drm_i915_private *i915)
{
        struct pci_dev *pdev = i915->drm.pdev;

        drm_dev_fini(&i915->drm);
        kfree(i915);

        /* And make sure we never chase our dangling pointer from pci_dev */
        pci_set_drvdata(pdev, NULL);
}

/**
 * i915_driver_load - setup chip and create an initial config
 * @pdev: PCI device
 * @ent: matching PCI ID entry
 *
 * The driver load routine has to do several things:
 *   - drive output discovery via intel_modeset_init()
 *   - initialize the memory manager
 *   - allocate initial config memory
 *   - setup the DRM framebuffer with the allocated memory
 */
int i915_driver_load(struct pci_dev *pdev, const struct pci_device_id *ent)
{
        const struct intel_device_info *match_info =
                (struct intel_device_info *)ent->driver_data;
        struct drm_i915_private *dev_priv;
        int ret;

        dev_priv = i915_driver_create(pdev, ent);
        if (IS_ERR(dev_priv))
                return PTR_ERR(dev_priv);

        /* Disable nuclear pageflip by default on pre-ILK */
        if (!i915_modparams.nuclear_pageflip && match_info->gen < 5)
                dev_priv->drm.driver_features &= ~DRIVER_ATOMIC;

        ret = pci_enable_device(pdev);
        if (ret)
                goto out_fini;

        ret = i915_driver_init_early(dev_priv);
        if (ret < 0)
                goto out_pci_disable;

        disable_rpm_wakeref_asserts(dev_priv);

        ret = i915_driver_init_mmio(dev_priv);
        if (ret < 0)
                goto out_runtime_pm_put;

        ret = i915_driver_init_hw(dev_priv);
        if (ret < 0)
                goto out_cleanup_mmio;

        ret = i915_load_modeset_init(&dev_priv->drm);
        if (ret < 0)
                goto out_cleanup_hw;

        i915_driver_register(dev_priv);

        enable_rpm_wakeref_asserts(dev_priv);

        i915_welcome_messages(dev_priv);

        return 0;

out_cleanup_hw:
        i915_driver_cleanup_hw(dev_priv);
out_cleanup_mmio:
        i915_driver_cleanup_mmio(dev_priv);
out_runtime_pm_put:
        enable_rpm_wakeref_asserts(dev_priv);
        i915_driver_cleanup_early(dev_priv);
out_pci_disable:
        pci_disable_device(pdev);
out_fini:
        i915_load_error(dev_priv, "Device initialization failed (%d)\n", ret);
        i915_driver_destroy(dev_priv);
        return ret;
}

void i915_driver_unload(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct pci_dev *pdev = dev_priv->drm.pdev;

        disable_rpm_wakeref_asserts(dev_priv);

        i915_driver_unregister(dev_priv);

        /* Flush any external code that still may be under the RCU lock */
        synchronize_rcu();

        if (i915_gem_suspend(dev_priv))
                DRM_ERROR("failed to idle hardware; continuing to unload!\n");

        drm_atomic_helper_shutdown(dev);

        intel_gvt_cleanup(dev_priv);

        intel_modeset_cleanup(dev);

        intel_bios_cleanup(dev_priv);

        vga_switcheroo_unregister_client(pdev);
        vga_client_register(pdev, NULL, NULL, NULL);

        intel_csr_ucode_fini(dev_priv);

        /* Free error state after interrupts are fully disabled. */
        cancel_delayed_work_sync(&dev_priv->gpu_error.hangcheck_work);
        i915_reset_error_state(dev_priv);

        i915_gem_fini(dev_priv);

        intel_power_domains_fini_hw(dev_priv);

        i915_driver_cleanup_hw(dev_priv);
        i915_driver_cleanup_mmio(dev_priv);

        enable_rpm_wakeref_asserts(dev_priv);
        intel_runtime_pm_cleanup(dev_priv);
}

static void i915_driver_release(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);

        i915_driver_cleanup_early(dev_priv);
        i915_driver_destroy(dev_priv);
}

static int i915_driver_open(struct drm_device *dev, struct drm_file *file)
{
        struct drm_i915_private *i915 = to_i915(dev);
        int ret;

        ret = i915_gem_open(i915, file);
        if (ret)
                return ret;

        return 0;
}

/**
 * i915_driver_lastclose - clean up after all DRM clients have exited
 * @dev: DRM device
 *
 * Take care of cleaning up after all DRM clients have exited.  In the
 * mode setting case, we want to restore the kernel's initial mode (just
 * in case the last client left us in a bad state).
 *
 * Additionally, in the non-mode setting case, we'll tear down the GTT
 * and DMA structures, since the kernel won't be using them, and clea
 * up any GEM state.
 */
static void i915_driver_lastclose(struct drm_device *dev)
{
        intel_fbdev_restore_mode(dev);
        vga_switcheroo_process_delayed_switch();
}

static void i915_driver_postclose(struct drm_device *dev, struct drm_file *file)
{
        struct drm_i915_file_private *file_priv = file->driver_priv;

        mutex_lock(&dev->struct_mutex);
        i915_gem_context_close(file);
        i915_gem_release(dev, file);
        mutex_unlock(&dev->struct_mutex);

        kfree(file_priv);
}

static void intel_suspend_encoders(struct drm_i915_private *dev_priv)
{
        struct drm_device *dev = &dev_priv->drm;
        struct intel_encoder *encoder;

        drm_modeset_lock_all(dev);
        for_each_intel_encoder(dev, encoder)
                if (encoder->suspend)
                        encoder->suspend(encoder);
        drm_modeset_unlock_all(dev);
}

static int vlv_resume_prepare(struct drm_i915_private *dev_priv,
                              bool rpm_resume);
static int vlv_suspend_complete(struct drm_i915_private *dev_priv);

static bool suspend_to_idle(struct drm_i915_private *dev_priv)
{
#if IS_ENABLED(CONFIG_ACPI_SLEEP)
        if (acpi_target_system_state() < ACPI_STATE_S3)
                return true;
#endif
        return false;
}

static int i915_drm_prepare(struct drm_device *dev)
{
        struct drm_i915_private *i915 = to_i915(dev);
        int err;

        /*
         * NB intel_display_suspend() may issue new requests after we've
         * ostensibly marked the GPU as ready-to-sleep here. We need to
         * split out that work and pull it forward so that after point,
         * the GPU is not woken again.
         */
        err = i915_gem_suspend(i915);
        if (err)
                dev_err(&i915->drm.pdev->dev,
                        "GEM idle failed, suspend/resume might fail\n");

        return err;
}

static int i915_drm_suspend(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct pci_dev *pdev = dev_priv->drm.pdev;
        pci_power_t opregion_target_state;

        disable_rpm_wakeref_asserts(dev_priv);

        /* We do a lot of poking in a lot of registers, make sure they work
         * properly. */
        intel_power_domains_disable(dev_priv);

        drm_kms_helper_poll_disable(dev);

        pci_save_state(pdev);

        intel_display_suspend(dev);

        intel_dp_mst_suspend(dev_priv);

        intel_runtime_pm_disable_interrupts(dev_priv);
        intel_hpd_cancel_work(dev_priv);

        intel_suspend_encoders(dev_priv);

        intel_suspend_hw(dev_priv);

        i915_gem_suspend_gtt_mappings(dev_priv);

        i915_save_state(dev_priv);

        opregion_target_state = suspend_to_idle(dev_priv) ? PCI_D1 : PCI_D3cold;
        intel_opregion_suspend(dev_priv, opregion_target_state);

        intel_fbdev_set_suspend(dev, FBINFO_STATE_SUSPENDED, true);

        dev_priv->suspend_count++;

        intel_csr_ucode_suspend(dev_priv);

        enable_rpm_wakeref_asserts(dev_priv);

        return 0;
}

static enum i915_drm_suspend_mode
get_suspend_mode(struct drm_i915_private *dev_priv, bool hibernate)
{
        if (hibernate)
                return I915_DRM_SUSPEND_HIBERNATE;

        if (suspend_to_idle(dev_priv))
                return I915_DRM_SUSPEND_IDLE;

        return I915_DRM_SUSPEND_MEM;
}

static int i915_drm_suspend_late(struct drm_device *dev, bool hibernation)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct pci_dev *pdev = dev_priv->drm.pdev;
        int ret;

        disable_rpm_wakeref_asserts(dev_priv);

        i915_gem_suspend_late(dev_priv);

        intel_uncore_suspend(dev_priv);

        intel_power_domains_suspend(dev_priv,
                                    get_suspend_mode(dev_priv, hibernation));

        ret = 0;
        if (INTEL_GEN(dev_priv) >= 11 || IS_GEN9_LP(dev_priv))
                bxt_enable_dc9(dev_priv);
        else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
                hsw_enable_pc8(dev_priv);
        else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
                ret = vlv_suspend_complete(dev_priv);

        if (ret) {
                DRM_ERROR("Suspend complete failed: %d\n", ret);
                intel_power_domains_resume(dev_priv);

                goto out;
        }

        pci_disable_device(pdev);
        /*
         * During hibernation on some platforms the BIOS may try to access
         * the device even though it's already in D3 and hang the machine. So
         * leave the device in D0 on those platforms and hope the BIOS will
         * power down the device properly. The issue was seen on multiple old
         * GENs with different BIOS vendors, so having an explicit blacklist
         * is inpractical; apply the workaround on everything pre GEN6. The
         * platforms where the issue was seen:
         * Lenovo Thinkpad X301, X61s, X60, T60, X41
         * Fujitsu FSC S7110
         * Acer Aspire 1830T
         */
        if (!(hibernation && INTEL_GEN(dev_priv) < 6))
                pci_set_power_state(pdev, PCI_D3hot);

out:
        enable_rpm_wakeref_asserts(dev_priv);
        if (!dev_priv->uncore.user_forcewake.count)
                intel_runtime_pm_cleanup(dev_priv);

        return ret;
}

static int i915_suspend_switcheroo(struct drm_device *dev, pm_message_t state)
{
        int error;

        if (!dev) {
                DRM_ERROR("dev: %p\n", dev);
                DRM_ERROR("DRM not initialized, aborting suspend.\n");
                return -ENODEV;
        }

        if (WARN_ON_ONCE(state.event != PM_EVENT_SUSPEND &&
                         state.event != PM_EVENT_FREEZE))
                return -EINVAL;

        if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
                return 0;

        error = i915_drm_suspend(dev);
        if (error)
                return error;

        return i915_drm_suspend_late(dev, false);
}

static int i915_drm_resume(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        int ret;

        disable_rpm_wakeref_asserts(dev_priv);
        intel_sanitize_gt_powersave(dev_priv);

        i915_gem_sanitize(dev_priv);

        ret = i915_ggtt_enable_hw(dev_priv);
        if (ret)
                DRM_ERROR("failed to re-enable GGTT\n");

        intel_csr_ucode_resume(dev_priv);

        i915_restore_state(dev_priv);
        intel_pps_unlock_regs_wa(dev_priv);

        intel_init_pch_refclk(dev_priv);

        /*
         * Interrupts have to be enabled before any batches are run. If not the
         * GPU will hang. i915_gem_init_hw() will initiate batches to
         * update/restore the context.
         *
         * drm_mode_config_reset() needs AUX interrupts.
         *
         * Modeset enabling in intel_modeset_init_hw() also needs working
         * interrupts.
         */
        intel_runtime_pm_enable_interrupts(dev_priv);

        drm_mode_config_reset(dev);

        i915_gem_resume(dev_priv);

        intel_modeset_init_hw(dev);
        intel_init_clock_gating(dev_priv);

        spin_lock_irq(&dev_priv->irq_lock);
        if (dev_priv->display.hpd_irq_setup)
                dev_priv->display.hpd_irq_setup(dev_priv);
        spin_unlock_irq(&dev_priv->irq_lock);

        intel_dp_mst_resume(dev_priv);

        intel_display_resume(dev);

        drm_kms_helper_poll_enable(dev);

        /*
         * ... but also need to make sure that hotplug processing
         * doesn't cause havoc. Like in the driver load code we don't
         * bother with the tiny race here where we might lose hotplug
         * notifications.
         * */
        intel_hpd_init(dev_priv);

        intel_opregion_resume(dev_priv);

        intel_fbdev_set_suspend(dev, FBINFO_STATE_RUNNING, false);

        intel_power_domains_enable(dev_priv);

        enable_rpm_wakeref_asserts(dev_priv);

        return 0;
}

static int i915_drm_resume_early(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct pci_dev *pdev = dev_priv->drm.pdev;
        int ret;

        /*
         * We have a resume ordering issue with the snd-hda driver also
         * requiring our device to be power up. Due to the lack of a
         * parent/child relationship we currently solve this with an early
         * resume hook.
         *
         * FIXME: This should be solved with a special hdmi sink device or
         * similar so that power domains can be employed.
         */

        /*
         * Note that we need to set the power state explicitly, since we
         * powered off the device during freeze and the PCI core won't power
         * it back up for us during thaw. Powering off the device during
         * freeze is not a hard requirement though, and during the
         * suspend/resume phases the PCI core makes sure we get here with the
         * device powered on. So in case we change our freeze logic and keep
         * the device powered we can also remove the following set power state
         * call.
         */
        ret = pci_set_power_state(pdev, PCI_D0);
        if (ret) {
                DRM_ERROR("failed to set PCI D0 power state (%d)\n", ret);
                return ret;
        }

        /*
         * Note that pci_enable_device() first enables any parent bridge
         * device and only then sets the power state for this device. The
         * bridge enabling is a nop though, since bridge devices are resumed
         * first. The order of enabling power and enabling the device is
         * imposed by the PCI core as described above, so here we preserve the
         * same order for the freeze/thaw phases.
         *
         * TODO: eventually we should remove pci_disable_device() /
         * pci_enable_enable_device() from suspend/resume. Due to how they
         * depend on the device enable refcount we can't anyway depend on them
         * disabling/enabling the device.
         */
        if (pci_enable_device(pdev))
                return -EIO;

        pci_set_master(pdev);

        disable_rpm_wakeref_asserts(dev_priv);

        if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
                ret = vlv_resume_prepare(dev_priv, false);
        if (ret)
                DRM_ERROR("Resume prepare failed: %d, continuing anyway\n",
                          ret);

        intel_uncore_resume_early(dev_priv);

        if (INTEL_GEN(dev_priv) >= 11 || IS_GEN9_LP(dev_priv)) {
                gen9_sanitize_dc_state(dev_priv);
                bxt_disable_dc9(dev_priv);
        } else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
                hsw_disable_pc8(dev_priv);
        }

        intel_uncore_sanitize(dev_priv);

        intel_power_domains_resume(dev_priv);

        intel_engines_sanitize(dev_priv, true);

        enable_rpm_wakeref_asserts(dev_priv);

        return ret;
}

static int i915_resume_switcheroo(struct drm_device *dev)
{
        int ret;

        if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
                return 0;

        ret = i915_drm_resume_early(dev);
        if (ret)
                return ret;

        return i915_drm_resume(dev);
}

static int i915_pm_prepare(struct device *kdev)
{
        struct pci_dev *pdev = to_pci_dev(kdev);
        struct drm_device *dev = pci_get_drvdata(pdev);

        if (!dev) {
                dev_err(kdev, "DRM not initialized, aborting suspend.\n");
                return -ENODEV;
        }

        if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
                return 0;

        return i915_drm_prepare(dev);
}

static int i915_pm_suspend(struct device *kdev)
{
        struct pci_dev *pdev = to_pci_dev(kdev);
        struct drm_device *dev = pci_get_drvdata(pdev);

        if (!dev) {
                dev_err(kdev, "DRM not initialized, aborting suspend.\n");
                return -ENODEV;
        }

        if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
                return 0;

        return i915_drm_suspend(dev);
}

static int i915_pm_suspend_late(struct device *kdev)
{
        struct drm_device *dev = &kdev_to_i915(kdev)->drm;

        /*
         * We have a suspend ordering issue with the snd-hda driver also
         * requiring our device to be power up. Due to the lack of a
         * parent/child relationship we currently solve this with an late
         * suspend hook.
         *
         * FIXME: This should be solved with a special hdmi sink device or
         * similar so that power domains can be employed.
         */
        if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
                return 0;

        return i915_drm_suspend_late(dev, false);
}

static int i915_pm_poweroff_late(struct device *kdev)
{
        struct drm_device *dev = &kdev_to_i915(kdev)->drm;

        if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
                return 0;

        return i915_drm_suspend_late(dev, true);
}

static int i915_pm_resume_early(struct device *kdev)
{
        struct drm_device *dev = &kdev_to_i915(kdev)->drm;

        if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
                return 0;

        return i915_drm_resume_early(dev);
}

static int i915_pm_resume(struct device *kdev)
{
        struct drm_device *dev = &kdev_to_i915(kdev)->drm;

        if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
                return 0;

        return i915_drm_resume(dev);
}

/* freeze: before creating the hibernation_image */
static int i915_pm_freeze(struct device *kdev)
{
        struct drm_device *dev = &kdev_to_i915(kdev)->drm;
        int ret;

        if (dev->switch_power_state != DRM_SWITCH_POWER_OFF) {
                ret = i915_drm_suspend(dev);
                if (ret)
                        return ret;
        }

        ret = i915_gem_freeze(kdev_to_i915(kdev));
        if (ret)
                return ret;

        return 0;
}

static int i915_pm_freeze_late(struct device *kdev)
{
        struct drm_device *dev = &kdev_to_i915(kdev)->drm;
        int ret;

        if (dev->switch_power_state != DRM_SWITCH_POWER_OFF) {
                ret = i915_drm_suspend_late(dev, true);
                if (ret)
                        return ret;
        }

        ret = i915_gem_freeze_late(kdev_to_i915(kdev));
        if (ret)
                return ret;

        return 0;
}

/* thaw: called after creating the hibernation image, but before turning off. */
static int i915_pm_thaw_early(struct device *kdev)
{
        return i915_pm_resume_early(kdev);
}

static int i915_pm_thaw(struct device *kdev)
{
        return i915_pm_resume(kdev);
}

/* restore: called after loading the hibernation image. */
static int i915_pm_restore_early(struct device *kdev)
{
        return i915_pm_resume_early(kdev);
}

static int i915_pm_restore(struct device *kdev)
{
        return i915_pm_resume(kdev);
}

/*
 * Save all Gunit registers that may be lost after a D3 and a subsequent
 * S0i[R123] transition. The list of registers needing a save/restore is
 * defined in the VLV2_S0IXRegs document. This documents marks all Gunit
 * registers in the following way:
 * - Driver: saved/restored by the driver
 * - Punit : saved/restored by the Punit firmware
 * - No, w/o marking: no need to save/restore, since the register is R/O or
 *                    used internally by the HW in a way that doesn't depend
 *                    keeping the content across a suspend/resume.
 * - Debug : used for debugging
 *
 * We save/restore all registers marked with 'Driver', with the following
 * exceptions:
 * - Registers out of use, including also registers marked with 'Debug'.
 *   These have no effect on the driver's operation, so we don't save/restore
 *   them to reduce the overhead.
 * - Registers that are fully setup by an initialization function called from
 *   the resume path. For example many clock gating and RPS/RC6 registers.
 * - Registers that provide the right functionality with their reset defaults.
 *
 * TODO: Except for registers that based on the above 3 criteria can be safely
 * ignored, we save/restore all others, practically treating the HW context as
 * a black-box for the driver. Further investigation is needed to reduce the
 * saved/restored registers even further, by following the same 3 criteria.
 */
static void vlv_save_gunit_s0ix_state(struct drm_i915_private *dev_priv)
{
        struct vlv_s0ix_state *s = &dev_priv->vlv_s0ix_state;
        int i;

        /* GAM 0x4000-0x4770 */
        s->wr_watermark         = I915_READ(GEN7_WR_WATERMARK);
        s->gfx_prio_ctrl        = I915_READ(GEN7_GFX_PRIO_CTRL);
        s->arb_mode             = I915_READ(ARB_MODE);
        s->gfx_pend_tlb0        = I915_READ(GEN7_GFX_PEND_TLB0);
        s->gfx_pend_tlb1        = I915_READ(GEN7_GFX_PEND_TLB1);

        for (i = 0; i < ARRAY_SIZE(s->lra_limits); i++)
                s->lra_limits[i] = I915_READ(GEN7_LRA_LIMITS(i));

        s->media_max_req_count  = I915_READ(GEN7_MEDIA_MAX_REQ_COUNT);
        s->gfx_max_req_count    = I915_READ(GEN7_GFX_MAX_REQ_COUNT);

        s->render_hwsp          = I915_READ(RENDER_HWS_PGA_GEN7);
        s->ecochk               = I915_READ(GAM_ECOCHK);
        s->bsd_hwsp             = I915_READ(BSD_HWS_PGA_GEN7);
        s->blt_hwsp             = I915_READ(BLT_HWS_PGA_GEN7);

        s->tlb_rd_addr          = I915_READ(GEN7_TLB_RD_ADDR);

        /* MBC 0x9024-0x91D0, 0x8500 */
        s->g3dctl               = I915_READ(VLV_G3DCTL);
        s->gsckgctl             = I915_READ(VLV_GSCKGCTL);
        s->mbctl                = I915_READ(GEN6_MBCTL);

        /* GCP 0x9400-0x9424, 0x8100-0x810C */
        s->ucgctl1              = I915_READ(GEN6_UCGCTL1);
        s->ucgctl3              = I915_READ(GEN6_UCGCTL3);
        s->rcgctl1              = I915_READ(GEN6_RCGCTL1);
        s->rcgctl2              = I915_READ(GEN6_RCGCTL2);
        s->rstctl               = I915_READ(GEN6_RSTCTL);
        s->misccpctl            = I915_READ(GEN7_MISCCPCTL);

        /* GPM 0xA000-0xAA84, 0x8000-0x80FC */
        s->gfxpause             = I915_READ(GEN6_GFXPAUSE);
        s->rpdeuhwtc            = I915_READ(GEN6_RPDEUHWTC);
        s->rpdeuc               = I915_READ(GEN6_RPDEUC);
        s->ecobus               = I915_READ(ECOBUS);
        s->pwrdwnupctl          = I915_READ(VLV_PWRDWNUPCTL);
        s->rp_down_timeout      = I915_READ(GEN6_RP_DOWN_TIMEOUT);
        s->rp_deucsw            = I915_READ(GEN6_RPDEUCSW);
        s->rcubmabdtmr          = I915_READ(GEN6_RCUBMABDTMR);
        s->rcedata              = I915_READ(VLV_RCEDATA);
        s->spare2gh             = I915_READ(VLV_SPAREG2H);

        /* Display CZ domain, 0x4400C-0x4402C, 0x4F000-0x4F11F */
        s->gt_imr               = I915_READ(GTIMR);
        s->gt_ier               = I915_READ(GTIER);
        s->pm_imr               = I915_READ(GEN6_PMIMR);
        s->pm_ier               = I915_READ(GEN6_PMIER);

        for (i = 0; i < ARRAY_SIZE(s->gt_scratch); i++)
                s->gt_scratch[i] = I915_READ(GEN7_GT_SCRATCH(i));

        /* GT SA CZ domain, 0x100000-0x138124 */
        s->tilectl              = I915_READ(TILECTL);
        s->gt_fifoctl           = I915_READ(GTFIFOCTL);
        s->gtlc_wake_ctrl       = I915_READ(VLV_GTLC_WAKE_CTRL);
        s->gtlc_survive         = I915_READ(VLV_GTLC_SURVIVABILITY_REG);
        s->pmwgicz              = I915_READ(VLV_PMWGICZ);

        /* Gunit-Display CZ domain, 0x182028-0x1821CF */
        s->gu_ctl0              = I915_READ(VLV_GU_CTL0);
        s->gu_ctl1              = I915_READ(VLV_GU_CTL1);
        s->pcbr                 = I915_READ(VLV_PCBR);
        s->clock_gate_dis2      = I915_READ(VLV_GUNIT_CLOCK_GATE2);

        /*
         * Not saving any of:
         * DFT,         0x9800-0x9EC0
         * SARB,        0xB000-0xB1FC
         * GAC,         0x5208-0x524C, 0x14000-0x14C000
         * PCI CFG
         */
}

static void vlv_restore_gunit_s0ix_state(struct drm_i915_private *dev_priv)
{
        struct vlv_s0ix_state *s = &dev_priv->vlv_s0ix_state;
        u32 val;
        int i;

        /* GAM 0x4000-0x4770 */
        I915_WRITE(GEN7_WR_WATERMARK,   s->wr_watermark);
        I915_WRITE(GEN7_GFX_PRIO_CTRL,  s->gfx_prio_ctrl);
        I915_WRITE(ARB_MODE,            s->arb_mode | (0xffff << 16));
        I915_WRITE(GEN7_GFX_PEND_TLB0,  s->gfx_pend_tlb0);
        I915_WRITE(GEN7_GFX_PEND_TLB1,  s->gfx_pend_tlb1);

        for (i = 0; i < ARRAY_SIZE(s->lra_limits); i++)
                I915_WRITE(GEN7_LRA_LIMITS(i), s->lra_limits[i]);

        I915_WRITE(GEN7_MEDIA_MAX_REQ_COUNT, s->media_max_req_count);
        I915_WRITE(GEN7_GFX_MAX_REQ_COUNT, s->gfx_max_req_count);

        I915_WRITE(RENDER_HWS_PGA_GEN7, s->render_hwsp);
        I915_WRITE(GAM_ECOCHK,          s->ecochk);
        I915_WRITE(BSD_HWS_PGA_GEN7,    s->bsd_hwsp);
        I915_WRITE(BLT_HWS_PGA_GEN7,    s->blt_hwsp);

        I915_WRITE(GEN7_TLB_RD_ADDR,    s->tlb_rd_addr);

        /* MBC 0x9024-0x91D0, 0x8500 */
        I915_WRITE(VLV_G3DCTL,          s->g3dctl);
        I915_WRITE(VLV_GSCKGCTL,        s->gsckgctl);
        I915_WRITE(GEN6_MBCTL,          s->mbctl);

        /* GCP 0x9400-0x9424, 0x8100-0x810C */
        I915_WRITE(GEN6_UCGCTL1,        s->ucgctl1);
        I915_WRITE(GEN6_UCGCTL3,        s->ucgctl3);
        I915_WRITE(GEN6_RCGCTL1,        s->rcgctl1);
        I915_WRITE(GEN6_RCGCTL2,        s->rcgctl2);
        I915_WRITE(GEN6_RSTCTL,         s->rstctl);
        I915_WRITE(GEN7_MISCCPCTL,      s->misccpctl);

        /* GPM 0xA000-0xAA84, 0x8000-0x80FC */
        I915_WRITE(GEN6_GFXPAUSE,       s->gfxpause);
        I915_WRITE(GEN6_RPDEUHWTC,      s->rpdeuhwtc);
        I915_WRITE(GEN6_RPDEUC,         s->rpdeuc);
        I915_WRITE(ECOBUS,              s->ecobus);
        I915_WRITE(VLV_PWRDWNUPCTL,     s->pwrdwnupctl);
        I915_WRITE(GEN6_RP_DOWN_TIMEOUT,s->rp_down_timeout);
        I915_WRITE(GEN6_RPDEUCSW,       s->rp_deucsw);
        I915_WRITE(GEN6_RCUBMABDTMR,    s->rcubmabdtmr);
        I915_WRITE(VLV_RCEDATA,         s->rcedata);
        I915_WRITE(VLV_SPAREG2H,        s->spare2gh);

        /* Display CZ domain, 0x4400C-0x4402C, 0x4F000-0x4F11F */
        I915_WRITE(GTIMR,               s->gt_imr);
        I915_WRITE(GTIER,               s->gt_ier);
        I915_WRITE(GEN6_PMIMR,          s->pm_imr);
        I915_WRITE(GEN6_PMIER,          s->pm_ier);

        for (i = 0; i < ARRAY_SIZE(s->gt_scratch); i++)
                I915_WRITE(GEN7_GT_SCRATCH(i), s->gt_scratch[i]);

        /* GT SA CZ domain, 0x100000-0x138124 */
        I915_WRITE(TILECTL,                     s->tilectl);
        I915_WRITE(GTFIFOCTL,                   s->gt_fifoctl);
        /*
         * Preserve the GT allow wake and GFX force clock bit, they are not
         * be restored, as they are used to control the s0ix suspend/resume
         * sequence by the caller.
         */
        val = I915_READ(VLV_GTLC_WAKE_CTRL);
        val &= VLV_GTLC_ALLOWWAKEREQ;
        val |= s->gtlc_wake_ctrl & ~VLV_GTLC_ALLOWWAKEREQ;
        I915_WRITE(VLV_GTLC_WAKE_CTRL, val);

        val = I915_READ(VLV_GTLC_SURVIVABILITY_REG);
        val &= VLV_GFX_CLK_FORCE_ON_BIT;
        val |= s->gtlc_survive & ~VLV_GFX_CLK_FORCE_ON_BIT;
        I915_WRITE(VLV_GTLC_SURVIVABILITY_REG, val);

        I915_WRITE(VLV_PMWGICZ,                 s->pmwgicz);

        /* Gunit-Display CZ domain, 0x182028-0x1821CF */
        I915_WRITE(VLV_GU_CTL0,                 s->gu_ctl0);
        I915_WRITE(VLV_GU_CTL1,                 s->gu_ctl1);
        I915_WRITE(VLV_PCBR,                    s->pcbr);
        I915_WRITE(VLV_GUNIT_CLOCK_GATE2,       s->clock_gate_dis2);
}

static int vlv_wait_for_pw_status(struct drm_i915_private *dev_priv,
                                  u32 mask, u32 val)
{
        i915_reg_t reg = VLV_GTLC_PW_STATUS;
        u32 reg_value;
        int ret;

        /* The HW does not like us polling for PW_STATUS frequently, so
         * use the sleeping loop rather than risk the busy spin within
         * intel_wait_for_register().
         *
         * Transitioning between RC6 states should be at most 2ms (see
         * valleyview_enable_rps) so use a 3ms timeout.
         */
        ret = wait_for(((reg_value = I915_READ_NOTRACE(reg)) & mask) == val, 3);

        /* just trace the final value */
        trace_i915_reg_rw(false, reg, reg_value, sizeof(reg_value), true);

        return ret;
}

int vlv_force_gfx_clock(struct drm_i915_private *dev_priv, bool force_on)
{
        u32 val;
        int err;

        val = I915_READ(VLV_GTLC_SURVIVABILITY_REG);
        val &= ~VLV_GFX_CLK_FORCE_ON_BIT;
        if (force_on)
                val |= VLV_GFX_CLK_FORCE_ON_BIT;
        I915_WRITE(VLV_GTLC_SURVIVABILITY_REG, val);

        if (!force_on)
                return 0;

        err = intel_wait_for_register(dev_priv,
                                      VLV_GTLC_SURVIVABILITY_REG,
                                      VLV_GFX_CLK_STATUS_BIT,
                                      VLV_GFX_CLK_STATUS_BIT,
                                      20);
        if (err)
                DRM_ERROR("timeout waiting for GFX clock force-on (%08x)\n",
                          I915_READ(VLV_GTLC_SURVIVABILITY_REG));

        return err;
}

static int vlv_allow_gt_wake(struct drm_i915_private *dev_priv, bool allow)
{
        u32 mask;
        u32 val;
        int err;

        val = I915_READ(VLV_GTLC_WAKE_CTRL);
        val &= ~VLV_GTLC_ALLOWWAKEREQ;
        if (allow)
                val |= VLV_GTLC_ALLOWWAKEREQ;
        I915_WRITE(VLV_GTLC_WAKE_CTRL, val);
        POSTING_READ(VLV_GTLC_WAKE_CTRL);

        mask = VLV_GTLC_ALLOWWAKEACK;
        val = allow ? mask : 0;

        err = vlv_wait_for_pw_status(dev_priv, mask, val);
        if (err)
                DRM_ERROR("timeout disabling GT waking\n");

        return err;
}

static void vlv_wait_for_gt_wells(struct drm_i915_private *dev_priv,
                                  bool wait_for_on)
{
        u32 mask;
        u32 val;

        mask = VLV_GTLC_PW_MEDIA_STATUS_MASK | VLV_GTLC_PW_RENDER_STATUS_MASK;
        val = wait_for_on ? mask : 0;

        /*
         * RC6 transitioning can be delayed up to 2 msec (see
         * valleyview_enable_rps), use 3 msec for safety.
         *
         * This can fail to turn off the rc6 if the GPU is stuck after a failed
         * reset and we are trying to force the machine to sleep.
         */
        if (vlv_wait_for_pw_status(dev_priv, mask, val))
                DRM_DEBUG_DRIVER("timeout waiting for GT wells to go %s\n",
                                 onoff(wait_for_on));
}

static void vlv_check_no_gt_access(struct drm_i915_private *dev_priv)
{
        if (!(I915_READ(VLV_GTLC_PW_STATUS) & VLV_GTLC_ALLOWWAKEERR))
                return;

        DRM_DEBUG_DRIVER("GT register access while GT waking disabled\n");
        I915_WRITE(VLV_GTLC_PW_STATUS, VLV_GTLC_ALLOWWAKEERR);
}

static int vlv_suspend_complete(struct drm_i915_private *dev_priv)
{
        u32 mask;
        int err;

        /*
         * Bspec defines the following GT well on flags as debug only, so
         * don't treat them as hard failures.
         */
        vlv_wait_for_gt_wells(dev_priv, false);

        mask = VLV_GTLC_RENDER_CTX_EXISTS | VLV_GTLC_MEDIA_CTX_EXISTS;
        WARN_ON((I915_READ(VLV_GTLC_WAKE_CTRL) & mask) != mask);

        vlv_check_no_gt_access(dev_priv);

        err = vlv_force_gfx_clock(dev_priv, true);
        if (err)
                goto err1;

        err = vlv_allow_gt_wake(dev_priv, false);
        if (err)
                goto err2;

        if (!IS_CHERRYVIEW(dev_priv))
                vlv_save_gunit_s0ix_state(dev_priv);

        err = vlv_force_gfx_clock(dev_priv, false);
        if (err)
                goto err2;

        return 0;

err2:
        /* For safety always re-enable waking and disable gfx clock forcing */
        vlv_allow_gt_wake(dev_priv, true);
err1:
        vlv_force_gfx_clock(dev_priv, false);

        return err;
}

static int vlv_resume_prepare(struct drm_i915_private *dev_priv,
                                bool rpm_resume)
{
        int err;
        int ret;

        /*
         * If any of the steps fail just try to continue, that's the best we
         * can do at this point. Return the first error code (which will also
         * leave RPM permanently disabled).
         */
        ret = vlv_force_gfx_clock(dev_priv, true);

        if (!IS_CHERRYVIEW(dev_priv))
                vlv_restore_gunit_s0ix_state(dev_priv);

        err = vlv_allow_gt_wake(dev_priv, true);
        if (!ret)
                ret = err;

        err = vlv_force_gfx_clock(dev_priv, false);
        if (!ret)
                ret = err;

        vlv_check_no_gt_access(dev_priv);

        if (rpm_resume)
                intel_init_clock_gating(dev_priv);

        return ret;
}

static int intel_runtime_suspend(struct device *kdev)
{
        struct pci_dev *pdev = to_pci_dev(kdev);
        struct drm_device *dev = pci_get_drvdata(pdev);
        struct drm_i915_private *dev_priv = to_i915(dev);
        int ret;

        if (WARN_ON_ONCE(!(dev_priv->gt_pm.rc6.enabled && HAS_RC6(dev_priv))))
                return -ENODEV;

        if (WARN_ON_ONCE(!HAS_RUNTIME_PM(dev_priv)))
                return -ENODEV;

        DRM_DEBUG_KMS("Suspending device\n");

        disable_rpm_wakeref_asserts(dev_priv);

        /*
         * We are safe here against re-faults, since the fault handler takes
         * an RPM reference.
         */
        i915_gem_runtime_suspend(dev_priv);

        intel_uc_suspend(dev_priv);

        intel_runtime_pm_disable_interrupts(dev_priv);

        intel_uncore_suspend(dev_priv);

        ret = 0;
        if (INTEL_GEN(dev_priv) >= 11) {
                icl_display_core_uninit(dev_priv);
                bxt_enable_dc9(dev_priv);
        } else if (IS_GEN9_LP(dev_priv)) {
                bxt_display_core_uninit(dev_priv);
                bxt_enable_dc9(dev_priv);
        } else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
                hsw_enable_pc8(dev_priv);
        } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
                ret = vlv_suspend_complete(dev_priv);
        }

        if (ret) {
                DRM_ERROR("Runtime suspend failed, disabling it (%d)\n", ret);
                intel_uncore_runtime_resume(dev_priv);

                intel_runtime_pm_enable_interrupts(dev_priv);

                intel_uc_resume(dev_priv);

                i915_gem_init_swizzling(dev_priv);
                i915_gem_restore_fences(dev_priv);

                enable_rpm_wakeref_asserts(dev_priv);

                return ret;
        }

        enable_rpm_wakeref_asserts(dev_priv);
        intel_runtime_pm_cleanup(dev_priv);

        if (intel_uncore_arm_unclaimed_mmio_detection(dev_priv))
                DRM_ERROR("Unclaimed access detected prior to suspending\n");

        dev_priv->runtime_pm.suspended = true;

        /*
         * FIXME: We really should find a document that references the arguments
         * used below!
         */
        if (IS_BROADWELL(dev_priv)) {
                /*
                 * On Broadwell, if we use PCI_D1 the PCH DDI ports will stop
                 * being detected, and the call we do at intel_runtime_resume()
                 * won't be able to restore them. Since PCI_D3hot matches the
                 * actual specification and appears to be working, use it.
                 */
                intel_opregion_notify_adapter(dev_priv, PCI_D3hot);
        } else {
                /*
                 * current versions of firmware which depend on this opregion
                 * notification have repurposed the D1 definition to mean
                 * "runtime suspended" vs. what you would normally expect (D3)
                 * to distinguish it from notifications that might be sent via
                 * the suspend path.
                 */
                intel_opregion_notify_adapter(dev_priv, PCI_D1);
        }

        assert_forcewakes_inactive(dev_priv);

        if (!IS_VALLEYVIEW(dev_priv) && !IS_CHERRYVIEW(dev_priv))
                intel_hpd_poll_init(dev_priv);

        DRM_DEBUG_KMS("Device suspended\n");
        return 0;
}

static int intel_runtime_resume(struct device *kdev)
{
        struct pci_dev *pdev = to_pci_dev(kdev);
        struct drm_device *dev = pci_get_drvdata(pdev);
        struct drm_i915_private *dev_priv = to_i915(dev);
        int ret = 0;

        if (WARN_ON_ONCE(!HAS_RUNTIME_PM(dev_priv)))
                return -ENODEV;

        DRM_DEBUG_KMS("Resuming device\n");

        WARN_ON_ONCE(atomic_read(&dev_priv->runtime_pm.wakeref_count));
        disable_rpm_wakeref_asserts(dev_priv);

        intel_opregion_notify_adapter(dev_priv, PCI_D0);
        dev_priv->runtime_pm.suspended = false;
        if (intel_uncore_unclaimed_mmio(dev_priv))
                DRM_DEBUG_DRIVER("Unclaimed access during suspend, bios?\n");

        if (INTEL_GEN(dev_priv) >= 11) {
                bxt_disable_dc9(dev_priv);
                icl_display_core_init(dev_priv, true);
                if (dev_priv->csr.dmc_payload) {
                        if (dev_priv->csr.allowed_dc_mask &
                            DC_STATE_EN_UPTO_DC6)
                                skl_enable_dc6(dev_priv);
                        else if (dev_priv->csr.allowed_dc_mask &
                                 DC_STATE_EN_UPTO_DC5)
                                gen9_enable_dc5(dev_priv);
                }
        } else if (IS_GEN9_LP(dev_priv)) {
                bxt_disable_dc9(dev_priv);
                bxt_display_core_init(dev_priv, true);
                if (dev_priv->csr.dmc_payload &&
                    (dev_priv->csr.allowed_dc_mask & DC_STATE_EN_UPTO_DC5))
                        gen9_enable_dc5(dev_priv);
        } else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
                hsw_disable_pc8(dev_priv);
        } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
                ret = vlv_resume_prepare(dev_priv, true);
        }

        intel_uncore_runtime_resume(dev_priv);

        intel_runtime_pm_enable_interrupts(dev_priv);

        intel_uc_resume(dev_priv);

        /*
         * No point of rolling back things in case of an error, as the best
         * we can do is to hope that things will still work (and disable RPM).
         */
        i915_gem_init_swizzling(dev_priv);
        i915_gem_restore_fences(dev_priv);

        /*
         * On VLV/CHV display interrupts are part of the display
         * power well, so hpd is reinitialized from there. For
         * everyone else do it here.
         */
        if (!IS_VALLEYVIEW(dev_priv) && !IS_CHERRYVIEW(dev_priv))
                intel_hpd_init(dev_priv);

        intel_enable_ipc(dev_priv);

        enable_rpm_wakeref_asserts(dev_priv);

        if (ret)
                DRM_ERROR("Runtime resume failed, disabling it (%d)\n", ret);
        else
                DRM_DEBUG_KMS("Device resumed\n");

        return ret;
}

const struct dev_pm_ops i915_pm_ops = {
        /*
         * S0ix (via system suspend) and S3 event handlers [PMSG_SUSPEND,
         * PMSG_RESUME]
         */
        .prepare = i915_pm_prepare,
        .suspend = i915_pm_suspend,
        .suspend_late = i915_pm_suspend_late,
        .resume_early = i915_pm_resume_early,
        .resume = i915_pm_resume,

        /*
         * S4 event handlers
         * @freeze, @freeze_late    : called (1) before creating the
         *                            hibernation image [PMSG_FREEZE] and
         *                            (2) after rebooting, before restoring
         *                            the image [PMSG_QUIESCE]
         * @thaw, @thaw_early       : called (1) after creating the hibernation
         *                            image, before writing it [PMSG_THAW]
         *                            and (2) after failing to create or
         *                            restore the image [PMSG_RECOVER]
         * @poweroff, @poweroff_late: called after writing the hibernation
         *                            image, before rebooting [PMSG_HIBERNATE]
         * @restore, @restore_early : called after rebooting and restoring the
         *                            hibernation image [PMSG_RESTORE]
         */
        .freeze = i915_pm_freeze,
        .freeze_late = i915_pm_freeze_late,
        .thaw_early = i915_pm_thaw_early,
        .thaw = i915_pm_thaw,
        .poweroff = i915_pm_suspend,
        .poweroff_late = i915_pm_poweroff_late,
        .restore_early = i915_pm_restore_early,
        .restore = i915_pm_restore,

        /* S0ix (via runtime suspend) event handlers */
        .runtime_suspend = intel_runtime_suspend,
        .runtime_resume = intel_runtime_resume,
};

static const struct vm_operations_struct i915_gem_vm_ops = {
        .fault = i915_gem_fault,
        .open = drm_gem_vm_open,
        .close = drm_gem_vm_close,
};

static const struct file_operations i915_driver_fops = {
        .owner = THIS_MODULE,
        .open = drm_open,
        .release = drm_release,
        .unlocked_ioctl = drm_ioctl,
        .mmap = drm_gem_mmap,
        .poll = drm_poll,
        .read = drm_read,
        .compat_ioctl = i915_compat_ioctl,
        .llseek = noop_llseek,
};

static int
i915_gem_reject_pin_ioctl(struct drm_device *dev, void *data,
                          struct drm_file *file)
{
        return -ENODEV;
}

static const struct drm_ioctl_desc i915_ioctls[] = {
        DRM_IOCTL_DEF_DRV(I915_INIT, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF_DRV(I915_FLUSH, drm_noop, DRM_AUTH),
        DRM_IOCTL_DEF_DRV(I915_FLIP, drm_noop, DRM_AUTH),
        DRM_IOCTL_DEF_DRV(I915_BATCHBUFFER, drm_noop, DRM_AUTH),
        DRM_IOCTL_DEF_DRV(I915_IRQ_EMIT, drm_noop, DRM_AUTH),
        DRM_IOCTL_DEF_DRV(I915_IRQ_WAIT, drm_noop, DRM_AUTH),
        DRM_IOCTL_DEF_DRV(I915_GETPARAM, i915_getparam_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_SETPARAM, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF_DRV(I915_ALLOC, drm_noop, DRM_AUTH),
        DRM_IOCTL_DEF_DRV(I915_FREE, drm_noop, DRM_AUTH),
        DRM_IOCTL_DEF_DRV(I915_INIT_HEAP, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF_DRV(I915_CMDBUFFER, drm_noop, DRM_AUTH),
        DRM_IOCTL_DEF_DRV(I915_DESTROY_HEAP,  drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF_DRV(I915_SET_VBLANK_PIPE,  drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF_DRV(I915_GET_VBLANK_PIPE,  drm_noop, DRM_AUTH),
        DRM_IOCTL_DEF_DRV(I915_VBLANK_SWAP, drm_noop, DRM_AUTH),
        DRM_IOCTL_DEF_DRV(I915_HWS_ADDR, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF_DRV(I915_GEM_INIT, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF_DRV(I915_GEM_EXECBUFFER, i915_gem_execbuffer_ioctl, DRM_AUTH),
        DRM_IOCTL_DEF_DRV(I915_GEM_EXECBUFFER2_WR, i915_gem_execbuffer2_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_PIN, i915_gem_reject_pin_ioctl, DRM_AUTH|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF_DRV(I915_GEM_UNPIN, i915_gem_reject_pin_ioctl, DRM_AUTH|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF_DRV(I915_GEM_BUSY, i915_gem_busy_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_SET_CACHING, i915_gem_set_caching_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_GET_CACHING, i915_gem_get_caching_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_THROTTLE, i915_gem_throttle_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_ENTERVT, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF_DRV(I915_GEM_LEAVEVT, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF_DRV(I915_GEM_CREATE, i915_gem_create_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_PREAD, i915_gem_pread_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_PWRITE, i915_gem_pwrite_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_MMAP, i915_gem_mmap_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_MMAP_GTT, i915_gem_mmap_gtt_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_SET_DOMAIN, i915_gem_set_domain_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_SW_FINISH, i915_gem_sw_finish_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_SET_TILING, i915_gem_set_tiling_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_GET_TILING, i915_gem_get_tiling_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_GET_APERTURE, i915_gem_get_aperture_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GET_PIPE_FROM_CRTC_ID, intel_get_pipe_from_crtc_id_ioctl, 0),
        DRM_IOCTL_DEF_DRV(I915_GEM_MADVISE, i915_gem_madvise_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_OVERLAY_PUT_IMAGE, intel_overlay_put_image_ioctl, DRM_MASTER),
        DRM_IOCTL_DEF_DRV(I915_OVERLAY_ATTRS, intel_overlay_attrs_ioctl, DRM_MASTER),
        DRM_IOCTL_DEF_DRV(I915_SET_SPRITE_COLORKEY, intel_sprite_set_colorkey_ioctl, DRM_MASTER),
        DRM_IOCTL_DEF_DRV(I915_GET_SPRITE_COLORKEY, drm_noop, DRM_MASTER),
        DRM_IOCTL_DEF_DRV(I915_GEM_WAIT, i915_gem_wait_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_CONTEXT_CREATE, i915_gem_context_create_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_CONTEXT_DESTROY, i915_gem_context_destroy_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_REG_READ, i915_reg_read_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GET_RESET_STATS, i915_gem_context_reset_stats_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_USERPTR, i915_gem_userptr_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_CONTEXT_GETPARAM, i915_gem_context_getparam_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_CONTEXT_SETPARAM, i915_gem_context_setparam_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_PERF_OPEN, i915_perf_open_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_PERF_ADD_CONFIG, i915_perf_add_config_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_PERF_REMOVE_CONFIG, i915_perf_remove_config_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_QUERY, i915_query_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
};

static struct drm_driver driver = {
        /* Don't use MTRRs here; the Xserver or userspace app should
         * deal with them for Intel hardware.
         */
        .driver_features =
            DRIVER_GEM | DRIVER_PRIME |
            DRIVER_RENDER | DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_SYNCOBJ,
        .release = i915_driver_release,
        .open = i915_driver_open,
        .lastclose = i915_driver_lastclose,
        .postclose = i915_driver_postclose,

        .gem_close_object = i915_gem_close_object,
        .gem_free_object_unlocked = i915_gem_free_object,
        .gem_vm_ops = &i915_gem_vm_ops,

        .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
        .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
        .gem_prime_export = i915_gem_prime_export,
        .gem_prime_import = i915_gem_prime_import,

        .dumb_create = i915_gem_dumb_create,
        .dumb_map_offset = i915_gem_mmap_gtt,
        .ioctls = i915_ioctls,
        .num_ioctls = ARRAY_SIZE(i915_ioctls),
        .fops = &i915_driver_fops,
        .name = DRIVER_NAME,
        .desc = DRIVER_DESC,
        .date = DRIVER_DATE,
        .major = DRIVER_MAJOR,
        .minor = DRIVER_MINOR,
        .patchlevel = DRIVER_PATCHLEVEL,
};

#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
#include "selftests/mock_drm.c"
#endif