/* 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/module.h>
#include <linux/oom.h>
#include <linux/pci.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/pnp.h>
#include <linux/slab.h>
#include <linux/string_helpers.h>
#include <linux/vga_switcheroo.h>
#include <linux/vt.h>

#include <drm/drm_aperture.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_ioctl.h>
#include <drm/drm_managed.h>
#include <drm/drm_probe_helper.h>

#include "display/intel_acpi.h"
#include "display/intel_bw.h"
#include "display/intel_cdclk.h"
#include "display/intel_display_types.h"
#include "display/intel_dmc.h"
#include "display/intel_dp.h"
#include "display/intel_dpt.h"
#include "display/intel_fbdev.h"
#include "display/intel_hotplug.h"
#include "display/intel_overlay.h"
#include "display/intel_pch_refclk.h"
#include "display/intel_pipe_crc.h"
#include "display/intel_pps.h"
#include "display/intel_sprite.h"
#include "display/intel_vga.h"

#include "gem/i915_gem_context.h"
#include "gem/i915_gem_create.h"
#include "gem/i915_gem_dmabuf.h"
#include "gem/i915_gem_ioctls.h"
#include "gem/i915_gem_mman.h"
#include "gem/i915_gem_pm.h"
#include "gt/intel_gt.h"
#include "gt/intel_gt_pm.h"
#include "gt/intel_rc6.h"

#include "pxp/intel_pxp_pm.h"

#include "i915_file_private.h"
#include "i915_debugfs.h"
#include "i915_driver.h"
#include "i915_drm_client.h"
#include "i915_drv.h"
#include "i915_getparam.h"
#include "i915_ioc32.h"
#include "i915_ioctl.h"
#include "i915_irq.h"
#include "i915_memcpy.h"
#include "i915_perf.h"
#include "i915_query.h"
#include "i915_suspend.h"
#include "i915_switcheroo.h"
#include "i915_sysfs.h"
#include "i915_utils.h"
#include "i915_vgpu.h"
#include "intel_dram.h"
#include "intel_gvt.h"
#include "intel_memory_region.h"
#include "intel_pci_config.h"
#include "intel_pcode.h"
#include "intel_pm.h"
#include "intel_region_ttm.h"
#include "vlv_suspend.h"

static const struct drm_driver i915_drm_driver;

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

        dev_priv->bridge_dev =
                pci_get_domain_bus_and_slot(domain, 0, PCI_DEVFN(0, 0));
        if (!dev_priv->bridge_dev) {
                drm_err(&dev_priv->drm, "bridge device not found\n");
                return -EIO;
        }
        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 = GRAPHICS_VER(dev_priv) >= 4 ? MCHBAR_I965 : MCHBAR_I915;
        u32 temp_lo, temp_hi = 0;
        u64 mchbar_addr;
        int ret;

        if (GRAPHICS_VER(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_dbg(&dev_priv->drm, "failed bus alloc: %d\n", ret);
                dev_priv->mch_res.start = 0;
                return ret;
        }

        if (GRAPHICS_VER(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 = GRAPHICS_VER(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 = GRAPHICS_VER(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);
}

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_err(&dev_priv->drm, "Failed to allocate workqueues.\n");

        return -ENOMEM;
}

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_SKYLAKE(dev_priv) && INTEL_REVID(dev_priv) < 0x6;
        pre |= IS_BROXTON(dev_priv) && INTEL_REVID(dev_priv) < 0xA;
        pre |= IS_KABYLAKE(dev_priv) && INTEL_REVID(dev_priv) < 0x1;
        pre |= IS_GEMINILAKE(dev_priv) && INTEL_REVID(dev_priv) < 0x3;
        pre |= IS_ICELAKE(dev_priv) && INTEL_REVID(dev_priv) < 0x7;

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

static void sanitize_gpu(struct drm_i915_private *i915)
{
        if (!INTEL_INFO(i915)->gpu_reset_clobbers_display)
                __intel_gt_reset(to_gt(i915), ALL_ENGINES);
}

/**
 * i915_driver_early_probe - 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_early_probe(struct drm_i915_private *dev_priv)
{
        int ret = 0;

        if (i915_inject_probe_failure(dev_priv))
                return -ENODEV;

        intel_device_info_subplatform_init(dev_priv);
        intel_step_init(dev_priv);

        intel_uncore_mmio_debug_init_early(&dev_priv->mmio_debug);

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

        mutex_init(&dev_priv->sb_lock);
        cpu_latency_qos_add_request(&dev_priv->sb_qos, PM_QOS_DEFAULT_VALUE);

        mutex_init(&dev_priv->audio.mutex);
        mutex_init(&dev_priv->wm.wm_mutex);
        mutex_init(&dev_priv->pps_mutex);
        mutex_init(&dev_priv->hdcp_comp_mutex);

        i915_memcpy_init_early(dev_priv);
        intel_runtime_pm_init_early(&dev_priv->runtime_pm);

        ret = i915_workqueues_init(dev_priv);
        if (ret < 0)
                return ret;

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

        ret = intel_region_ttm_device_init(dev_priv);
        if (ret)
                goto err_ttm;

        intel_wopcm_init_early(&dev_priv->wopcm);

        intel_root_gt_init_early(dev_priv);

        i915_drm_clients_init(&dev_priv->clients, dev_priv);

        i915_gem_init_early(dev_priv);

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

        intel_pm_setup(dev_priv);
        ret = intel_power_domains_init(dev_priv);
        if (ret < 0)
                goto err_gem;
        intel_irq_init(dev_priv);
        intel_init_display_hooks(dev_priv);
        intel_init_clock_gating_hooks(dev_priv);

        intel_detect_preproduction_hw(dev_priv);

        return 0;

err_gem:
        i915_gem_cleanup_early(dev_priv);
        intel_gt_driver_late_release_all(dev_priv);
        i915_drm_clients_fini(&dev_priv->clients);
        intel_region_ttm_device_fini(dev_priv);
err_ttm:
        vlv_suspend_cleanup(dev_priv);
err_workqueues:
        i915_workqueues_cleanup(dev_priv);
        return ret;
}

/**
 * i915_driver_late_release - cleanup the setup done in
 *                             i915_driver_early_probe()
 * @dev_priv: device private
 */
static void i915_driver_late_release(struct drm_i915_private *dev_priv)
{
        intel_irq_fini(dev_priv);
        intel_power_domains_cleanup(dev_priv);
        i915_gem_cleanup_early(dev_priv);
        intel_gt_driver_late_release_all(dev_priv);
        i915_drm_clients_fini(&dev_priv->clients);
        intel_region_ttm_device_fini(dev_priv);
        vlv_suspend_cleanup(dev_priv);
        i915_workqueues_cleanup(dev_priv);

        cpu_latency_qos_remove_request(&dev_priv->sb_qos);
        mutex_destroy(&dev_priv->sb_lock);

        i915_params_free(&dev_priv->params);
}

/**
 * i915_driver_mmio_probe - 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_mmio_probe(struct drm_i915_private *dev_priv)
{
        int ret;

        if (i915_inject_probe_failure(dev_priv))
                return -ENODEV;

        ret = i915_get_bridge_dev(dev_priv);
        if (ret < 0)
                return ret;

        ret = intel_uncore_init_mmio(&dev_priv->uncore);
        if (ret)
                return ret;

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

        ret = intel_gt_init_mmio(to_gt(dev_priv));
        if (ret)
                goto err_uncore;

        /* As early as possible, scrub existing GPU state before clobbering */
        sanitize_gpu(dev_priv);

        return 0;

err_uncore:
        intel_teardown_mchbar(dev_priv);
        intel_uncore_fini_mmio(&dev_priv->uncore);
        pci_dev_put(dev_priv->bridge_dev);

        return ret;
}

/**
 * i915_driver_mmio_release - cleanup the setup done in i915_driver_mmio_probe()
 * @dev_priv: device private
 */
static void i915_driver_mmio_release(struct drm_i915_private *dev_priv)
{
        intel_teardown_mchbar(dev_priv);
        intel_uncore_fini_mmio(&dev_priv->uncore);
        pci_dev_put(dev_priv->bridge_dev);
}

/**
 * i915_set_dma_info - set all relevant PCI dma info as configured for the
 * platform
 * @i915: valid i915 instance
 *
 * Set the dma max segment size, device and coherent masks.  The dma mask set
 * needs to occur before i915_ggtt_probe_hw.
 *
 * A couple of platforms have special needs.  Address them as well.
 *
 */
static int i915_set_dma_info(struct drm_i915_private *i915)
{
        unsigned int mask_size = INTEL_INFO(i915)->dma_mask_size;
        int ret;

        GEM_BUG_ON(!mask_size);

        /*
         * We don't have a max segment size, so set it to the max so sg's
         * debugging layer doesn't complain
         */
        dma_set_max_seg_size(i915->drm.dev, UINT_MAX);

        ret = dma_set_mask(i915->drm.dev, DMA_BIT_MASK(mask_size));
        if (ret)
                goto mask_err;

        /* overlay on gen2 is broken and can't address above 1G */
        if (GRAPHICS_VER(i915) == 2)
                mask_size = 30;

        /*
         * 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(i915) || IS_I965GM(i915))
                mask_size = 32;

        ret = dma_set_coherent_mask(i915->drm.dev, DMA_BIT_MASK(mask_size));
        if (ret)
                goto mask_err;

        return 0;

mask_err:
        drm_err(&i915->drm, "Can't set DMA mask/consistent mask (%d)\n", ret);
        return ret;
}

/**
 * i915_driver_hw_probe - 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_hw_probe(struct drm_i915_private *dev_priv)
{
        struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
        struct pci_dev *root_pdev;
        int ret;

        if (i915_inject_probe_failure(dev_priv))
                return -ENODEV;

        if (HAS_PPGTT(dev_priv)) {
                if (intel_vgpu_active(dev_priv) &&
                    !intel_vgpu_has_full_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;
                }
        }

        /* needs to be done before ggtt probe */
        intel_dram_edram_detect(dev_priv);

        ret = i915_set_dma_info(dev_priv);
        if (ret)
                return ret;

        i915_perf_init(dev_priv);

        ret = intel_gt_assign_ggtt(to_gt(dev_priv));
        if (ret)
                goto err_perf;

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

        ret = drm_aperture_remove_conflicting_pci_framebuffers(pdev, dev_priv->drm.driver);
        if (ret)
                goto err_ggtt;

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

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

        ret = intel_gt_tiles_init(dev_priv);
        if (ret)
                goto err_mem_regions;

        ret = i915_ggtt_enable_hw(dev_priv);
        if (ret) {
                drm_err(&dev_priv->drm, "failed to enable GGTT\n");
                goto err_mem_regions;
        }

        pci_set_master(pdev);

        /* 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 (GRAPHICS_VER(dev_priv) >= 5) {
                if (pci_enable_msi(pdev) < 0)
                        drm_dbg(&dev_priv->drm, "can't enable MSI");
        }

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

        intel_opregion_setup(dev_priv);

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

        /*
         * Fill the dram structure to get the system dram info. This will be
         * used for memory latency calculation.
         */
        intel_dram_detect(dev_priv);

        intel_bw_init_hw(dev_priv);

        /*
         * FIXME: Temporary hammer to avoid freezing the machine on our DGFX
         * This should be totally removed when we handle the pci states properly
         * on runtime PM and on s2idle cases.
         */
        root_pdev = pcie_find_root_port(pdev);
        if (root_pdev)
                pci_d3cold_disable(root_pdev);

        return 0;

err_msi:
        if (pdev->msi_enabled)
                pci_disable_msi(pdev);
err_mem_regions:
        intel_memory_regions_driver_release(dev_priv);
err_ggtt:
        i915_ggtt_driver_release(dev_priv);
        i915_gem_drain_freed_objects(dev_priv);
        i915_ggtt_driver_late_release(dev_priv);
err_perf:
        i915_perf_fini(dev_priv);
        return ret;
}

/**
 * i915_driver_hw_remove - cleanup the setup done in i915_driver_hw_probe()
 * @dev_priv: device private
 */
static void i915_driver_hw_remove(struct drm_i915_private *dev_priv)
{
        struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
        struct pci_dev *root_pdev;

        i915_perf_fini(dev_priv);

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

        root_pdev = pcie_find_root_port(pdev);
        if (root_pdev)
                pci_d3cold_enable(root_pdev);
}

/**
 * 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_driver_register(dev_priv);
        i915_pmu_register(dev_priv);

        intel_vgpu_register(dev_priv);

        /* Reveal our presence to userspace */
        if (drm_dev_register(dev, 0)) {
                drm_err(&dev_priv->drm,
                        "Failed to register driver for userspace access!\n");
                return;
        }

        i915_debugfs_register(dev_priv);
        i915_setup_sysfs(dev_priv);

        /* Depends on sysfs having been initialized */
        i915_perf_register(dev_priv);

        intel_gt_driver_register(to_gt(dev_priv));

        intel_display_driver_register(dev_priv);

        intel_power_domains_enable(dev_priv);
        intel_runtime_pm_enable(&dev_priv->runtime_pm);

        intel_register_dsm_handler();

        if (i915_switcheroo_register(dev_priv))
                drm_err(&dev_priv->drm, "Failed to register vga switcheroo!\n");
}

/**
 * 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)
{
        i915_switcheroo_unregister(dev_priv);

        intel_unregister_dsm_handler();

        intel_runtime_pm_disable(&dev_priv->runtime_pm);
        intel_power_domains_disable(dev_priv);

        intel_display_driver_unregister(dev_priv);

        intel_gt_driver_unregister(to_gt(dev_priv));

        i915_perf_unregister(dev_priv);
        i915_pmu_unregister(dev_priv);

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

        i915_gem_driver_unregister(dev_priv);
}

void
i915_print_iommu_status(struct drm_i915_private *i915, struct drm_printer *p)
{
        drm_printf(p, "iommu: %s\n",
                   str_enabled_disabled(i915_vtd_active(i915)));
}

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

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

                intel_device_info_print_static(INTEL_INFO(dev_priv), &p);
                intel_device_info_print_runtime(RUNTIME_INFO(dev_priv), &p);
                i915_print_iommu_status(dev_priv, &p);
                intel_gt_info_print(&to_gt(dev_priv)->info, &p);
        }

        if (IS_ENABLED(CONFIG_DRM_I915_DEBUG))
                drm_info(&dev_priv->drm, "DRM_I915_DEBUG enabled\n");
        if (IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM))
                drm_info(&dev_priv->drm, "DRM_I915_DEBUG_GEM enabled\n");
        if (IS_ENABLED(CONFIG_DRM_I915_DEBUG_RUNTIME_PM))
                drm_info(&dev_priv->drm,
                         "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;

        i915 = devm_drm_dev_alloc(&pdev->dev, &i915_drm_driver,
                                  struct drm_i915_private, drm);
        if (IS_ERR(i915))
                return i915;

        pci_set_drvdata(pdev, i915);

        /* Device parameters start as a copy of module parameters. */
        i915_params_copy(&i915->params, &i915_modparams);

        /* 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;

        return i915;
}

/**
 * i915_driver_probe - setup chip and create an initial config
 * @pdev: PCI device
 * @ent: matching PCI ID entry
 *
 * The driver probe 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_probe(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 *i915;
        int ret;

        i915 = i915_driver_create(pdev, ent);
        if (IS_ERR(i915))
                return PTR_ERR(i915);

        /* Disable nuclear pageflip by default on pre-ILK */
        if (!i915->params.nuclear_pageflip && match_info->graphics.ver < 5)
                i915->drm.driver_features &= ~DRIVER_ATOMIC;

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

        ret = i915_driver_early_probe(i915);
        if (ret < 0)
                goto out_pci_disable;

        disable_rpm_wakeref_asserts(&i915->runtime_pm);

        intel_vgpu_detect(i915);

        ret = intel_gt_probe_all(i915);
        if (ret < 0)
                goto out_runtime_pm_put;

        ret = i915_driver_mmio_probe(i915);
        if (ret < 0)
                goto out_tiles_cleanup;

        ret = i915_driver_hw_probe(i915);
        if (ret < 0)
                goto out_cleanup_mmio;

        ret = intel_modeset_init_noirq(i915);
        if (ret < 0)
                goto out_cleanup_hw;

        ret = intel_irq_install(i915);
        if (ret)
                goto out_cleanup_modeset;

        ret = intel_modeset_init_nogem(i915);
        if (ret)
                goto out_cleanup_irq;

        ret = i915_gem_init(i915);
        if (ret)
                goto out_cleanup_modeset2;

        ret = intel_modeset_init(i915);
        if (ret)
                goto out_cleanup_gem;

        i915_driver_register(i915);

        enable_rpm_wakeref_asserts(&i915->runtime_pm);

        i915_welcome_messages(i915);

        i915->do_release = true;

        return 0;

out_cleanup_gem:
        i915_gem_suspend(i915);
        i915_gem_driver_remove(i915);
        i915_gem_driver_release(i915);
out_cleanup_modeset2:
        /* FIXME clean up the error path */
        intel_modeset_driver_remove(i915);
        intel_irq_uninstall(i915);
        intel_modeset_driver_remove_noirq(i915);
        goto out_cleanup_modeset;
out_cleanup_irq:
        intel_irq_uninstall(i915);
out_cleanup_modeset:
        intel_modeset_driver_remove_nogem(i915);
out_cleanup_hw:
        i915_driver_hw_remove(i915);
        intel_memory_regions_driver_release(i915);
        i915_ggtt_driver_release(i915);
        i915_gem_drain_freed_objects(i915);
        i915_ggtt_driver_late_release(i915);
out_cleanup_mmio:
        i915_driver_mmio_release(i915);
out_tiles_cleanup:
        intel_gt_release_all(i915);
out_runtime_pm_put:
        enable_rpm_wakeref_asserts(&i915->runtime_pm);
        i915_driver_late_release(i915);
out_pci_disable:
        pci_disable_device(pdev);
out_fini:
        i915_probe_error(i915, "Device initialization failed (%d)\n", ret);
        return ret;
}

void i915_driver_remove(struct drm_i915_private *i915)
{
        disable_rpm_wakeref_asserts(&i915->runtime_pm);

        i915_driver_unregister(i915);

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

        i915_gem_suspend(i915);

        intel_gvt_driver_remove(i915);

        intel_modeset_driver_remove(i915);

        intel_irq_uninstall(i915);

        intel_modeset_driver_remove_noirq(i915);

        i915_reset_error_state(i915);
        i915_gem_driver_remove(i915);

        intel_modeset_driver_remove_nogem(i915);

        i915_driver_hw_remove(i915);

        enable_rpm_wakeref_asserts(&i915->runtime_pm);
}

static void i915_driver_release(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_runtime_pm *rpm = &dev_priv->runtime_pm;

        if (!dev_priv->do_release)
                return;

        disable_rpm_wakeref_asserts(rpm);

        i915_gem_driver_release(dev_priv);

        intel_memory_regions_driver_release(dev_priv);
        i915_ggtt_driver_release(dev_priv);
        i915_gem_drain_freed_objects(dev_priv);
        i915_ggtt_driver_late_release(dev_priv);

        i915_driver_mmio_release(dev_priv);

        enable_rpm_wakeref_asserts(rpm);
        intel_runtime_pm_driver_release(rpm);

        i915_driver_late_release(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)
{
        struct drm_i915_private *i915 = to_i915(dev);

        intel_fbdev_restore_mode(dev);

        if (HAS_DISPLAY(i915))
                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;

        i915_gem_context_close(file);
        i915_drm_client_put(file_priv->client);

        kfree_rcu(file_priv, rcu);

        /* Catch up with all the deferred frees from "this" client */
        i915_gem_flush_free_objects(to_i915(dev));
}

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

        if (!HAS_DISPLAY(dev_priv))
                return;

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

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

        if (!HAS_DISPLAY(dev_priv))
                return;

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

void i915_driver_shutdown(struct drm_i915_private *i915)
{
        disable_rpm_wakeref_asserts(&i915->runtime_pm);
        intel_runtime_pm_disable(&i915->runtime_pm);
        intel_power_domains_disable(i915);

        i915_gem_suspend(i915);

        if (HAS_DISPLAY(i915)) {
                drm_kms_helper_poll_disable(&i915->drm);

                drm_atomic_helper_shutdown(&i915->drm);
        }

        intel_dp_mst_suspend(i915);

        intel_runtime_pm_disable_interrupts(i915);
        intel_hpd_cancel_work(i915);

        intel_suspend_encoders(i915);
        intel_shutdown_encoders(i915);

        intel_dmc_ucode_suspend(i915);

        /*
         * The only requirement is to reboot with display DC states disabled,
         * for now leaving all display power wells in the INIT power domain
         * enabled.
         *
         * TODO:
         * - unify the pci_driver::shutdown sequence here with the
         *   pci_driver.driver.pm.poweroff,poweroff_late sequence.
         * - unify the driver remove and system/runtime suspend sequences with
         *   the above unified shutdown/poweroff sequence.
         */
        intel_power_domains_driver_remove(i915);
        enable_rpm_wakeref_asserts(&i915->runtime_pm);

        intel_runtime_pm_driver_release(&i915->runtime_pm);
}

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);

        /*
         * 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.
         */
        return i915_gem_backup_suspend(i915);
}

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

        disable_rpm_wakeref_asserts(&dev_priv->runtime_pm);

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

        /* Must be called before GGTT is suspended. */
        intel_dpt_suspend(dev_priv);
        i915_ggtt_suspend(to_gt(dev_priv)->ggtt);

        i915_save_display(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_dmc_ucode_suspend(dev_priv);

        enable_rpm_wakeref_asserts(&dev_priv->runtime_pm);

        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 = to_pci_dev(dev_priv->drm.dev);
        struct intel_runtime_pm *rpm = &dev_priv->runtime_pm;
        int ret;

        disable_rpm_wakeref_asserts(rpm);

        i915_gem_suspend_late(dev_priv);

        intel_uncore_suspend(&dev_priv->uncore);

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

        intel_display_power_suspend_late(dev_priv);

        ret = vlv_suspend_complete(dev_priv);
        if (ret) {
                drm_err(&dev_priv->drm, "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 && GRAPHICS_VER(dev_priv) < 6))
                pci_set_power_state(pdev, PCI_D3hot);

out:
        enable_rpm_wakeref_asserts(rpm);
        if (!dev_priv->uncore.user_forcewake_count)
                intel_runtime_pm_driver_release(rpm);

        return ret;
}

int i915_driver_suspend_switcheroo(struct drm_i915_private *i915,
                                   pm_message_t state)
{
        int error;

        if (drm_WARN_ON_ONCE(&i915->drm, state.event != PM_EVENT_SUSPEND &&
                             state.event != PM_EVENT_FREEZE))
                return -EINVAL;

        if (i915->drm.switch_power_state == DRM_SWITCH_POWER_OFF)
                return 0;

        error = i915_drm_suspend(&i915->drm);
        if (error)
                return error;

        return i915_drm_suspend_late(&i915->drm, 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->runtime_pm);

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

        sanitize_gpu(dev_priv);

        ret = i915_ggtt_enable_hw(dev_priv);
        if (ret)
                drm_err(&dev_priv->drm, "failed to re-enable GGTT\n");

        i915_ggtt_resume(to_gt(dev_priv)->ggtt);
        /* Must be called after GGTT is resumed. */
        intel_dpt_resume(dev_priv);

        intel_dmc_ucode_resume(dev_priv);

        i915_restore_display(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);

        if (HAS_DISPLAY(dev_priv))
                drm_mode_config_reset(dev);

        i915_gem_resume(dev_priv);

        intel_modeset_init_hw(dev_priv);
        intel_init_clock_gating(dev_priv);
        intel_hpd_init(dev_priv);

        /* MST sideband requires HPD interrupts enabled */
        intel_dp_mst_resume(dev_priv);
        intel_display_resume(dev);

        intel_hpd_poll_disable(dev_priv);
        if (HAS_DISPLAY(dev_priv))
                drm_kms_helper_poll_enable(dev);

        intel_opregion_resume(dev_priv);

        intel_fbdev_set_suspend(dev, FBINFO_STATE_RUNNING, false);

        intel_power_domains_enable(dev_priv);

        intel_gvt_resume(dev_priv);

        enable_rpm_wakeref_asserts(&dev_priv->runtime_pm);

        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 = to_pci_dev(dev_priv->drm.dev);
        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_err(&dev_priv->drm,
                        "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->runtime_pm);

        ret = vlv_resume_prepare(dev_priv, false);
        if (ret)
                drm_err(&dev_priv->drm,
                        "Resume prepare failed: %d, continuing anyway\n", ret);

        intel_uncore_resume_early(&dev_priv->uncore);

        intel_gt_check_and_clear_faults(to_gt(dev_priv));

        intel_display_power_resume_early(dev_priv);

        intel_power_domains_resume(dev_priv);

        enable_rpm_wakeref_asserts(&dev_priv->runtime_pm);

        return ret;
}

int i915_driver_resume_switcheroo(struct drm_i915_private *i915)
{
        int ret;

        if (i915->drm.switch_power_state == DRM_SWITCH_POWER_OFF)
                return 0;

        ret = i915_drm_resume_early(&i915->drm);
        if (ret)
                return ret;

        return i915_drm_resume(&i915->drm);
}

static int i915_pm_prepare(struct device *kdev)
{
        struct drm_i915_private *i915 = kdev_to_i915(kdev);

        if (!i915) {
                dev_err(kdev, "DRM not initialized, aborting suspend.\n");
                return -ENODEV;
        }

        if (i915->drm.switch_power_state == DRM_SWITCH_POWER_OFF)
                return 0;

        return i915_drm_prepare(&i915->drm);
}

static int i915_pm_suspend(struct device *kdev)
{
        struct drm_i915_private *i915 = kdev_to_i915(kdev);

        if (!i915) {
                dev_err(kdev, "DRM not initialized, aborting suspend.\n");
                return -ENODEV;
        }

        if (i915->drm.switch_power_state == DRM_SWITCH_POWER_OFF)
                return 0;

        return i915_drm_suspend(&i915->drm);
}

static int i915_pm_suspend_late(struct device *kdev)
{
        struct drm_i915_private *i915 = kdev_to_i915(kdev);

        /*
         * 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 (i915->drm.switch_power_state == DRM_SWITCH_POWER_OFF)
                return 0;

        return i915_drm_suspend_late(&i915->drm, false);
}

static int i915_pm_poweroff_late(struct device *kdev)
{
        struct drm_i915_private *i915 = kdev_to_i915(kdev);

        if (i915->drm.switch_power_state == DRM_SWITCH_POWER_OFF)
                return 0;

        return i915_drm_suspend_late(&i915->drm, true);
}

static int i915_pm_resume_early(struct device *kdev)
{
        struct drm_i915_private *i915 = kdev_to_i915(kdev);

        if (i915->drm.switch_power_state == DRM_SWITCH_POWER_OFF)
                return 0;

        return i915_drm_resume_early(&i915->drm);
}

static int i915_pm_resume(struct device *kdev)
{
        struct drm_i915_private *i915 = kdev_to_i915(kdev);

        if (i915->drm.switch_power_state == DRM_SWITCH_POWER_OFF)
                return 0;

        return i915_drm_resume(&i915->drm);
}

/* freeze: before creating the hibernation_image */
static int i915_pm_freeze(struct device *kdev)
{
        struct drm_i915_private *i915 = kdev_to_i915(kdev);
        int ret;

        if (i915->drm.switch_power_state != DRM_SWITCH_POWER_OFF) {
                ret = i915_drm_suspend(&i915->drm);
                if (ret)
                        return ret;
        }

        ret = i915_gem_freeze(i915);
        if (ret)
                return ret;

        return 0;
}

static int i915_pm_freeze_late(struct device *kdev)
{
        struct drm_i915_private *i915 = kdev_to_i915(kdev);
        int ret;

        if (i915->drm.switch_power_state != DRM_SWITCH_POWER_OFF) {
                ret = i915_drm_suspend_late(&i915->drm, true);
                if (ret)
                        return ret;
        }

        ret = i915_gem_freeze_late(i915);
        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);
}

static int intel_runtime_suspend(struct device *kdev)
{
        struct drm_i915_private *dev_priv = kdev_to_i915(kdev);
        struct intel_runtime_pm *rpm = &dev_priv->runtime_pm;
        int ret;

        if (drm_WARN_ON_ONCE(&dev_priv->drm, !HAS_RUNTIME_PM(dev_priv)))
                return -ENODEV;

        drm_dbg_kms(&dev_priv->drm, "Suspending device\n");

        disable_rpm_wakeref_asserts(rpm);

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

        intel_gt_runtime_suspend(to_gt(dev_priv));

        intel_runtime_pm_disable_interrupts(dev_priv);

        intel_uncore_suspend(&dev_priv->uncore);

        intel_display_power_suspend(dev_priv);

        ret = vlv_suspend_complete(dev_priv);
        if (ret) {
                drm_err(&dev_priv->drm,
                        "Runtime suspend failed, disabling it (%d)\n", ret);
                intel_uncore_runtime_resume(&dev_priv->uncore);

                intel_runtime_pm_enable_interrupts(dev_priv);

                intel_gt_runtime_resume(to_gt(dev_priv));

                enable_rpm_wakeref_asserts(rpm);

                return ret;
        }

        enable_rpm_wakeref_asserts(rpm);
        intel_runtime_pm_driver_release(rpm);

        if (intel_uncore_arm_unclaimed_mmio_detection(&dev_priv->uncore))
                drm_err(&dev_priv->drm,
                        "Unclaimed access detected prior to suspending\n");

        rpm->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->uncore);

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

        drm_dbg_kms(&dev_priv->drm, "Device suspended\n");
        return 0;
}

static int intel_runtime_resume(struct device *kdev)
{
        struct drm_i915_private *dev_priv = kdev_to_i915(kdev);
        struct intel_runtime_pm *rpm = &dev_priv->runtime_pm;
        int ret;

        if (drm_WARN_ON_ONCE(&dev_priv->drm, !HAS_RUNTIME_PM(dev_priv)))
                return -ENODEV;

        drm_dbg_kms(&dev_priv->drm, "Resuming device\n");

        drm_WARN_ON_ONCE(&dev_priv->drm, atomic_read(&rpm->wakeref_count));
        disable_rpm_wakeref_asserts(rpm);

        intel_opregion_notify_adapter(dev_priv, PCI_D0);
        rpm->suspended = false;
        if (intel_uncore_unclaimed_mmio(&dev_priv->uncore))
                drm_dbg(&dev_priv->drm,
                        "Unclaimed access during suspend, bios?\n");

        intel_display_power_resume(dev_priv);

        ret = vlv_resume_prepare(dev_priv, true);

        intel_uncore_runtime_resume(&dev_priv->uncore);

        intel_runtime_pm_enable_interrupts(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).
         */
        intel_gt_runtime_resume(to_gt(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_hpd_poll_disable(dev_priv);
        }

        intel_enable_ipc(dev_priv);

        enable_rpm_wakeref_asserts(rpm);

        if (ret)
                drm_err(&dev_priv->drm,
                        "Runtime resume failed, disabling it (%d)\n", ret);
        else
                drm_dbg_kms(&dev_priv->drm, "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 file_operations i915_driver_fops = {
        .owner = THIS_MODULE,
        .open = drm_open,
        .release = drm_release_noglobal,
        .unlocked_ioctl = drm_ioctl,
        .mmap = i915_gem_mmap,
        .poll = drm_poll,
        .read = drm_read,
        .compat_ioctl = i915_ioc32_compat_ioctl,
        .llseek = noop_llseek,
#ifdef CONFIG_PROC_FS
        .show_fdinfo = i915_drm_client_fdinfo,
#endif
};

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_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, drm_invalid_op, DRM_AUTH),
        DRM_IOCTL_DEF_DRV(I915_GEM_EXECBUFFER2_WR, i915_gem_execbuffer2_ioctl, 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_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_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_CREATE_EXT, i915_gem_create_ext_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_OFFSET, i915_gem_mmap_offset_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_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_CONTEXT_CREATE_EXT, 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_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_PERF_REMOVE_CONFIG, i915_perf_remove_config_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_QUERY, i915_query_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_VM_CREATE, i915_gem_vm_create_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_VM_DESTROY, i915_gem_vm_destroy_ioctl, DRM_RENDER_ALLOW),
};

/*
 * Interface history:
 *
 * 1.1: Original.
 * 1.2: Add Power Management
 * 1.3: Add vblank support
 * 1.4: Fix cmdbuffer path, add heap destroy
 * 1.5: Add vblank pipe configuration
 * 1.6: - New ioctl for scheduling buffer swaps on vertical blank
 *      - Support vertical blank on secondary display pipe
 */
#define DRIVER_MAJOR            1
#define DRIVER_MINOR            6
#define DRIVER_PATCHLEVEL       0

static const struct drm_driver i915_drm_driver = {
        /* Don't use MTRRs here; the Xserver or userspace app should
         * deal with them for Intel hardware.
         */
        .driver_features =
            DRIVER_GEM |
            DRIVER_RENDER | DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_SYNCOBJ |
            DRIVER_SYNCOBJ_TIMELINE,
        .release = i915_driver_release,
        .open = i915_driver_open,
        .lastclose = i915_driver_lastclose,
        .postclose = i915_driver_postclose,

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

        .dumb_create = i915_gem_dumb_create,
        .dumb_map_offset = i915_gem_dumb_mmap_offset,

        .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,
};