/* 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/device.h>
#include <linux/acpi.h>
#include <drm/drmP.h>
#include <drm/i915_drm.h>
#include "i915_drv.h"
#include "i915_trace.h"
#include "intel_drv.h"

#include <linux/apple-gmux.h>
#include <linux/console.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/vgaarb.h>
#include <linux/vga_switcheroo.h>
#include <drm/drm_crtc_helper.h>

static struct drm_driver driver;

#define GEN_DEFAULT_PIPEOFFSETS \
        .pipe_offsets = { PIPE_A_OFFSET, PIPE_B_OFFSET, \
                          PIPE_C_OFFSET, PIPE_EDP_OFFSET }, \
        .trans_offsets = { TRANSCODER_A_OFFSET, TRANSCODER_B_OFFSET, \
                           TRANSCODER_C_OFFSET, TRANSCODER_EDP_OFFSET }, \
        .palette_offsets = { PALETTE_A_OFFSET, PALETTE_B_OFFSET }

#define GEN_CHV_PIPEOFFSETS \
        .pipe_offsets = { PIPE_A_OFFSET, PIPE_B_OFFSET, \
                          CHV_PIPE_C_OFFSET }, \
        .trans_offsets = { TRANSCODER_A_OFFSET, TRANSCODER_B_OFFSET, \
                           CHV_TRANSCODER_C_OFFSET, }, \
        .palette_offsets = { PALETTE_A_OFFSET, PALETTE_B_OFFSET, \
                             CHV_PALETTE_C_OFFSET }

#define CURSOR_OFFSETS \
        .cursor_offsets = { CURSOR_A_OFFSET, CURSOR_B_OFFSET, CHV_CURSOR_C_OFFSET }

#define IVB_CURSOR_OFFSETS \
        .cursor_offsets = { CURSOR_A_OFFSET, IVB_CURSOR_B_OFFSET, IVB_CURSOR_C_OFFSET }

static const struct intel_device_info intel_i830_info = {
        .gen = 2, .is_mobile = 1, .cursor_needs_physical = 1, .num_pipes = 2,
        .has_overlay = 1, .overlay_needs_physical = 1,
        .ring_mask = RENDER_RING,
        GEN_DEFAULT_PIPEOFFSETS,
        CURSOR_OFFSETS,
};

static const struct intel_device_info intel_845g_info = {
        .gen = 2, .num_pipes = 1,
        .has_overlay = 1, .overlay_needs_physical = 1,
        .ring_mask = RENDER_RING,
        GEN_DEFAULT_PIPEOFFSETS,
        CURSOR_OFFSETS,
};

static const struct intel_device_info intel_i85x_info = {
        .gen = 2, .is_i85x = 1, .is_mobile = 1, .num_pipes = 2,
        .cursor_needs_physical = 1,
        .has_overlay = 1, .overlay_needs_physical = 1,
        .has_fbc = 1,
        .ring_mask = RENDER_RING,
        GEN_DEFAULT_PIPEOFFSETS,
        CURSOR_OFFSETS,
};

static const struct intel_device_info intel_i865g_info = {
        .gen = 2, .num_pipes = 1,
        .has_overlay = 1, .overlay_needs_physical = 1,
        .ring_mask = RENDER_RING,
        GEN_DEFAULT_PIPEOFFSETS,
        CURSOR_OFFSETS,
};

static const struct intel_device_info intel_i915g_info = {
        .gen = 3, .is_i915g = 1, .cursor_needs_physical = 1, .num_pipes = 2,
        .has_overlay = 1, .overlay_needs_physical = 1,
        .ring_mask = RENDER_RING,
        GEN_DEFAULT_PIPEOFFSETS,
        CURSOR_OFFSETS,
};
static const struct intel_device_info intel_i915gm_info = {
        .gen = 3, .is_mobile = 1, .num_pipes = 2,
        .cursor_needs_physical = 1,
        .has_overlay = 1, .overlay_needs_physical = 1,
        .supports_tv = 1,
        .has_fbc = 1,
        .ring_mask = RENDER_RING,
        GEN_DEFAULT_PIPEOFFSETS,
        CURSOR_OFFSETS,
};
static const struct intel_device_info intel_i945g_info = {
        .gen = 3, .has_hotplug = 1, .cursor_needs_physical = 1, .num_pipes = 2,
        .has_overlay = 1, .overlay_needs_physical = 1,
        .ring_mask = RENDER_RING,
        GEN_DEFAULT_PIPEOFFSETS,
        CURSOR_OFFSETS,
};
static const struct intel_device_info intel_i945gm_info = {
        .gen = 3, .is_i945gm = 1, .is_mobile = 1, .num_pipes = 2,
        .has_hotplug = 1, .cursor_needs_physical = 1,
        .has_overlay = 1, .overlay_needs_physical = 1,
        .supports_tv = 1,
        .has_fbc = 1,
        .ring_mask = RENDER_RING,
        GEN_DEFAULT_PIPEOFFSETS,
        CURSOR_OFFSETS,
};

static const struct intel_device_info intel_i965g_info = {
        .gen = 4, .is_broadwater = 1, .num_pipes = 2,
        .has_hotplug = 1,
        .has_overlay = 1,
        .ring_mask = RENDER_RING,
        GEN_DEFAULT_PIPEOFFSETS,
        CURSOR_OFFSETS,
};

static const struct intel_device_info intel_i965gm_info = {
        .gen = 4, .is_crestline = 1, .num_pipes = 2,
        .is_mobile = 1, .has_fbc = 1, .has_hotplug = 1,
        .has_overlay = 1,
        .supports_tv = 1,
        .ring_mask = RENDER_RING,
        GEN_DEFAULT_PIPEOFFSETS,
        CURSOR_OFFSETS,
};

static const struct intel_device_info intel_g33_info = {
        .gen = 3, .is_g33 = 1, .num_pipes = 2,
        .need_gfx_hws = 1, .has_hotplug = 1,
        .has_overlay = 1,
        .ring_mask = RENDER_RING,
        GEN_DEFAULT_PIPEOFFSETS,
        CURSOR_OFFSETS,
};

static const struct intel_device_info intel_g45_info = {
        .gen = 4, .is_g4x = 1, .need_gfx_hws = 1, .num_pipes = 2,
        .has_pipe_cxsr = 1, .has_hotplug = 1,
        .ring_mask = RENDER_RING | BSD_RING,
        GEN_DEFAULT_PIPEOFFSETS,
        CURSOR_OFFSETS,
};

static const struct intel_device_info intel_gm45_info = {
        .gen = 4, .is_g4x = 1, .num_pipes = 2,
        .is_mobile = 1, .need_gfx_hws = 1, .has_fbc = 1,
        .has_pipe_cxsr = 1, .has_hotplug = 1,
        .supports_tv = 1,
        .ring_mask = RENDER_RING | BSD_RING,
        GEN_DEFAULT_PIPEOFFSETS,
        CURSOR_OFFSETS,
};

static const struct intel_device_info intel_pineview_info = {
        .gen = 3, .is_g33 = 1, .is_pineview = 1, .is_mobile = 1, .num_pipes = 2,
        .need_gfx_hws = 1, .has_hotplug = 1,
        .has_overlay = 1,
        GEN_DEFAULT_PIPEOFFSETS,
        CURSOR_OFFSETS,
};

static const struct intel_device_info intel_ironlake_d_info = {
        .gen = 5, .num_pipes = 2,
        .need_gfx_hws = 1, .has_hotplug = 1,
        .ring_mask = RENDER_RING | BSD_RING,
        GEN_DEFAULT_PIPEOFFSETS,
        CURSOR_OFFSETS,
};

static const struct intel_device_info intel_ironlake_m_info = {
        .gen = 5, .is_mobile = 1, .num_pipes = 2,
        .need_gfx_hws = 1, .has_hotplug = 1,
        .has_fbc = 1,
        .ring_mask = RENDER_RING | BSD_RING,
        GEN_DEFAULT_PIPEOFFSETS,
        CURSOR_OFFSETS,
};

static const struct intel_device_info intel_sandybridge_d_info = {
        .gen = 6, .num_pipes = 2,
        .need_gfx_hws = 1, .has_hotplug = 1,
        .has_fbc = 1,
        .ring_mask = RENDER_RING | BSD_RING | BLT_RING,
        .has_llc = 1,
        GEN_DEFAULT_PIPEOFFSETS,
        CURSOR_OFFSETS,
};

static const struct intel_device_info intel_sandybridge_m_info = {
        .gen = 6, .is_mobile = 1, .num_pipes = 2,
        .need_gfx_hws = 1, .has_hotplug = 1,
        .has_fbc = 1,
        .ring_mask = RENDER_RING | BSD_RING | BLT_RING,
        .has_llc = 1,
        GEN_DEFAULT_PIPEOFFSETS,
        CURSOR_OFFSETS,
};

#define GEN7_FEATURES  \
        .gen = 7, .num_pipes = 3, \
        .need_gfx_hws = 1, .has_hotplug = 1, \
        .has_fbc = 1, \
        .ring_mask = RENDER_RING | BSD_RING | BLT_RING, \
        .has_llc = 1, \
        GEN_DEFAULT_PIPEOFFSETS, \
        IVB_CURSOR_OFFSETS

static const struct intel_device_info intel_ivybridge_d_info = {
        GEN7_FEATURES,
        .is_ivybridge = 1,
};

static const struct intel_device_info intel_ivybridge_m_info = {
        GEN7_FEATURES,
        .is_ivybridge = 1,
        .is_mobile = 1,
};

static const struct intel_device_info intel_ivybridge_q_info = {
        GEN7_FEATURES,
        .is_ivybridge = 1,
        .num_pipes = 0, /* legal, last one wins */
};

#define VLV_FEATURES  \
        .gen = 7, .num_pipes = 2, \
        .need_gfx_hws = 1, .has_hotplug = 1, \
        .ring_mask = RENDER_RING | BSD_RING | BLT_RING, \
        .display_mmio_offset = VLV_DISPLAY_BASE, \
        GEN_DEFAULT_PIPEOFFSETS, \
        CURSOR_OFFSETS

static const struct intel_device_info intel_valleyview_m_info = {
        VLV_FEATURES,
        .is_valleyview = 1,
        .is_mobile = 1,
};

static const struct intel_device_info intel_valleyview_d_info = {
        VLV_FEATURES,
        .is_valleyview = 1,
};

#define HSW_FEATURES  \
        GEN7_FEATURES, \
        .ring_mask = RENDER_RING | BSD_RING | BLT_RING | VEBOX_RING, \
        .has_ddi = 1, \
        .has_fpga_dbg = 1

static const struct intel_device_info intel_haswell_d_info = {
        HSW_FEATURES,
        .is_haswell = 1,
};

static const struct intel_device_info intel_haswell_m_info = {
        HSW_FEATURES,
        .is_haswell = 1,
        .is_mobile = 1,
};

static const struct intel_device_info intel_broadwell_d_info = {
        HSW_FEATURES,
        .gen = 8,
};

static const struct intel_device_info intel_broadwell_m_info = {
        HSW_FEATURES,
        .gen = 8, .is_mobile = 1,
};

static const struct intel_device_info intel_broadwell_gt3d_info = {
        HSW_FEATURES,
        .gen = 8,
        .ring_mask = RENDER_RING | BSD_RING | BLT_RING | VEBOX_RING | BSD2_RING,
};

static const struct intel_device_info intel_broadwell_gt3m_info = {
        HSW_FEATURES,
        .gen = 8, .is_mobile = 1,
        .ring_mask = RENDER_RING | BSD_RING | BLT_RING | VEBOX_RING | BSD2_RING,
};

static const struct intel_device_info intel_cherryview_info = {
        .gen = 8, .num_pipes = 3,
        .need_gfx_hws = 1, .has_hotplug = 1,
        .ring_mask = RENDER_RING | BSD_RING | BLT_RING | VEBOX_RING,
        .is_cherryview = 1,
        .display_mmio_offset = VLV_DISPLAY_BASE,
        GEN_CHV_PIPEOFFSETS,
        CURSOR_OFFSETS,
};

static const struct intel_device_info intel_skylake_info = {
        HSW_FEATURES,
        .is_skylake = 1,
        .gen = 9,
};

static const struct intel_device_info intel_skylake_gt3_info = {
        HSW_FEATURES,
        .is_skylake = 1,
        .gen = 9,
        .ring_mask = RENDER_RING | BSD_RING | BLT_RING | VEBOX_RING | BSD2_RING,
};

static const struct intel_device_info intel_broxton_info = {
        .is_preliminary = 1,
        .is_broxton = 1,
        .gen = 9,
        .need_gfx_hws = 1, .has_hotplug = 1,
        .ring_mask = RENDER_RING | BSD_RING | BLT_RING | VEBOX_RING,
        .num_pipes = 3,
        .has_ddi = 1,
        .has_fpga_dbg = 1,
        .has_fbc = 1,
        GEN_DEFAULT_PIPEOFFSETS,
        IVB_CURSOR_OFFSETS,
};

static const struct intel_device_info intel_kabylake_info = {
        HSW_FEATURES,
        .is_preliminary = 1,
        .is_kabylake = 1,
        .gen = 9,
};

static const struct intel_device_info intel_kabylake_gt3_info = {
        HSW_FEATURES,
        .is_preliminary = 1,
        .is_kabylake = 1,
        .gen = 9,
        .ring_mask = RENDER_RING | BSD_RING | BLT_RING | VEBOX_RING | BSD2_RING,
};

/*
 * Make sure any device matches here are from most specific to most
 * general.  For example, since the Quanta match is based on the subsystem
 * and subvendor IDs, we need it to come before the more general IVB
 * PCI ID matches, otherwise we'll use the wrong info struct above.
 */
static const struct pci_device_id pciidlist[] = {
        INTEL_I830_IDS(&intel_i830_info),
        INTEL_I845G_IDS(&intel_845g_info),
        INTEL_I85X_IDS(&intel_i85x_info),
        INTEL_I865G_IDS(&intel_i865g_info),
        INTEL_I915G_IDS(&intel_i915g_info),
        INTEL_I915GM_IDS(&intel_i915gm_info),
        INTEL_I945G_IDS(&intel_i945g_info),
        INTEL_I945GM_IDS(&intel_i945gm_info),
        INTEL_I965G_IDS(&intel_i965g_info),
        INTEL_G33_IDS(&intel_g33_info),
        INTEL_I965GM_IDS(&intel_i965gm_info),
        INTEL_GM45_IDS(&intel_gm45_info),
        INTEL_G45_IDS(&intel_g45_info),
        INTEL_PINEVIEW_IDS(&intel_pineview_info),
        INTEL_IRONLAKE_D_IDS(&intel_ironlake_d_info),
        INTEL_IRONLAKE_M_IDS(&intel_ironlake_m_info),
        INTEL_SNB_D_IDS(&intel_sandybridge_d_info),
        INTEL_SNB_M_IDS(&intel_sandybridge_m_info),
        INTEL_IVB_Q_IDS(&intel_ivybridge_q_info), /* must be first IVB */
        INTEL_IVB_M_IDS(&intel_ivybridge_m_info),
        INTEL_IVB_D_IDS(&intel_ivybridge_d_info),
        INTEL_HSW_D_IDS(&intel_haswell_d_info),
        INTEL_HSW_M_IDS(&intel_haswell_m_info),
        INTEL_VLV_M_IDS(&intel_valleyview_m_info),
        INTEL_VLV_D_IDS(&intel_valleyview_d_info),
        INTEL_BDW_GT12M_IDS(&intel_broadwell_m_info),
        INTEL_BDW_GT12D_IDS(&intel_broadwell_d_info),
        INTEL_BDW_GT3M_IDS(&intel_broadwell_gt3m_info),
        INTEL_BDW_GT3D_IDS(&intel_broadwell_gt3d_info),
        INTEL_CHV_IDS(&intel_cherryview_info),
        INTEL_SKL_GT1_IDS(&intel_skylake_info),
        INTEL_SKL_GT2_IDS(&intel_skylake_info),
        INTEL_SKL_GT3_IDS(&intel_skylake_gt3_info),
        INTEL_SKL_GT4_IDS(&intel_skylake_gt3_info),
        INTEL_BXT_IDS(&intel_broxton_info),
        INTEL_KBL_GT1_IDS(&intel_kabylake_info),
        INTEL_KBL_GT2_IDS(&intel_kabylake_info),
        INTEL_KBL_GT3_IDS(&intel_kabylake_gt3_info),
        INTEL_KBL_GT4_IDS(&intel_kabylake_gt3_info),
        {0, 0, 0}
};

MODULE_DEVICE_TABLE(pci, pciidlist);

static enum intel_pch intel_virt_detect_pch(struct drm_device *dev)
{
        enum intel_pch ret = PCH_NOP;

        /*
         * 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_GEN5(dev)) {
                ret = PCH_IBX;
                DRM_DEBUG_KMS("Assuming Ibex Peak PCH\n");
        } else if (IS_GEN6(dev) || IS_IVYBRIDGE(dev)) {
                ret = PCH_CPT;
                DRM_DEBUG_KMS("Assuming CouarPoint PCH\n");
        } else if (IS_HASWELL(dev) || IS_BROADWELL(dev)) {
                ret = PCH_LPT;
                DRM_DEBUG_KMS("Assuming LynxPoint PCH\n");
        } else if (IS_SKYLAKE(dev) || IS_KABYLAKE(dev)) {
                ret = PCH_SPT;
                DRM_DEBUG_KMS("Assuming SunrisePoint PCH\n");
        }

        return ret;
}

void intel_detect_pch(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct pci_dev *pch = NULL;

        /* In all current cases, num_pipes is equivalent to the PCH_NOP setting
         * (which really amounts to a PCH but no South Display).
         */
        if (INTEL_INFO(dev)->num_pipes == 0) {
                dev_priv->pch_type = PCH_NOP;
                return;
        }

        /*
         * 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))) {
                if (pch->vendor == PCI_VENDOR_ID_INTEL) {
                        unsigned short id = pch->device & INTEL_PCH_DEVICE_ID_MASK;
                        dev_priv->pch_id = id;

                        if (id == INTEL_PCH_IBX_DEVICE_ID_TYPE) {
                                dev_priv->pch_type = PCH_IBX;
                                DRM_DEBUG_KMS("Found Ibex Peak PCH\n");
                                WARN_ON(!IS_GEN5(dev));
                        } else if (id == INTEL_PCH_CPT_DEVICE_ID_TYPE) {
                                dev_priv->pch_type = PCH_CPT;
                                DRM_DEBUG_KMS("Found CougarPoint PCH\n");
                                WARN_ON(!(IS_GEN6(dev) || IS_IVYBRIDGE(dev)));
                        } else if (id == INTEL_PCH_PPT_DEVICE_ID_TYPE) {
                                /* PantherPoint is CPT compatible */
                                dev_priv->pch_type = PCH_CPT;
                                DRM_DEBUG_KMS("Found PantherPoint PCH\n");
                                WARN_ON(!(IS_GEN6(dev) || IS_IVYBRIDGE(dev)));
                        } else if (id == INTEL_PCH_LPT_DEVICE_ID_TYPE) {
                                dev_priv->pch_type = PCH_LPT;
                                DRM_DEBUG_KMS("Found LynxPoint PCH\n");
                                WARN_ON(!IS_HASWELL(dev) && !IS_BROADWELL(dev));
                                WARN_ON(IS_HSW_ULT(dev) || IS_BDW_ULT(dev));
                        } else if (id == INTEL_PCH_LPT_LP_DEVICE_ID_TYPE) {
                                dev_priv->pch_type = PCH_LPT;
                                DRM_DEBUG_KMS("Found LynxPoint LP PCH\n");
                                WARN_ON(!IS_HASWELL(dev) && !IS_BROADWELL(dev));
                                WARN_ON(!IS_HSW_ULT(dev) && !IS_BDW_ULT(dev));
                        } else if (id == INTEL_PCH_SPT_DEVICE_ID_TYPE) {
                                dev_priv->pch_type = PCH_SPT;
                                DRM_DEBUG_KMS("Found SunrisePoint PCH\n");
                                WARN_ON(!IS_SKYLAKE(dev) &&
                                        !IS_KABYLAKE(dev));
                        } else if (id == INTEL_PCH_SPT_LP_DEVICE_ID_TYPE) {
                                dev_priv->pch_type = PCH_SPT;
                                DRM_DEBUG_KMS("Found SunrisePoint LP PCH\n");
                                WARN_ON(!IS_SKYLAKE(dev) &&
                                        !IS_KABYLAKE(dev));
                        } else if ((id == INTEL_PCH_P2X_DEVICE_ID_TYPE) ||
                                   ((id == INTEL_PCH_QEMU_DEVICE_ID_TYPE) &&
                                    pch->subsystem_vendor == 0x1af4 &&
                                    pch->subsystem_device == 0x1100)) {
                                dev_priv->pch_type = intel_virt_detect_pch(dev);
                        } else
                                continue;

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

        pci_dev_put(pch);
}

bool i915_semaphore_is_enabled(struct drm_device *dev)
{
        if (INTEL_INFO(dev)->gen < 6)
                return false;

        if (i915.semaphores >= 0)
                return i915.semaphores;

        /* TODO: make semaphores and Execlists play nicely together */
        if (i915.enable_execlists)
                return false;

        /* Until we get further testing... */
        if (IS_GEN8(dev))
                return false;

#ifdef CONFIG_INTEL_IOMMU
        /* Enable semaphores on SNB when IO remapping is off */
        if (INTEL_INFO(dev)->gen == 6 && intel_iommu_gfx_mapped)
                return false;
#endif

        return true;
}

static void intel_suspend_encoders(struct drm_i915_private *dev_priv)
{
        struct drm_device *dev = dev_priv->dev;
        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 intel_suspend_complete(struct drm_i915_private *dev_priv);
static int vlv_resume_prepare(struct drm_i915_private *dev_priv,
                              bool rpm_resume);
static int bxt_resume_prepare(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_suspend(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        pci_power_t opregion_target_state;
        int error;

        /* ignore lid events during suspend */
        mutex_lock(&dev_priv->modeset_restore_lock);
        dev_priv->modeset_restore = MODESET_SUSPENDED;
        mutex_unlock(&dev_priv->modeset_restore_lock);

        disable_rpm_wakeref_asserts(dev_priv);

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

        drm_kms_helper_poll_disable(dev);

        pci_save_state(dev->pdev);

        error = i915_gem_suspend(dev);
        if (error) {
                dev_err(&dev->pdev->dev,
                        "GEM idle failed, resume might fail\n");
                goto out;
        }

        intel_guc_suspend(dev);

        intel_suspend_gt_powersave(dev);

        intel_display_suspend(dev);

        intel_dp_mst_suspend(dev);

        intel_runtime_pm_disable_interrupts(dev_priv);
        intel_hpd_cancel_work(dev_priv);

        intel_suspend_encoders(dev_priv);

        intel_suspend_hw(dev);

        i915_gem_suspend_gtt_mappings(dev);

        i915_save_state(dev);

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

        intel_uncore_forcewake_reset(dev, false);
        intel_opregion_fini(dev);

        intel_fbdev_set_suspend(dev, FBINFO_STATE_SUSPENDED, true);

        dev_priv->suspend_count++;

        intel_display_set_init_power(dev_priv, false);

        if (HAS_CSR(dev_priv))
                flush_work(&dev_priv->csr.work);

out:
        enable_rpm_wakeref_asserts(dev_priv);

        return error;
}

static int i915_drm_suspend_late(struct drm_device *drm_dev, bool hibernation)
{
        struct drm_i915_private *dev_priv = drm_dev->dev_private;
        bool fw_csr;
        int ret;

        disable_rpm_wakeref_asserts(dev_priv);

        fw_csr = suspend_to_idle(dev_priv) && dev_priv->csr.dmc_payload;
        /*
         * In case of firmware assisted context save/restore don't manually
         * deinit the power domains. This also means the CSR/DMC firmware will
         * stay active, it will power down any HW resources as required and
         * also enable deeper system power states that would be blocked if the
         * firmware was inactive.
         */
        if (!fw_csr)
                intel_power_domains_suspend(dev_priv);

        ret = intel_suspend_complete(dev_priv);

        if (ret) {
                DRM_ERROR("Suspend complete failed: %d\n", ret);
                if (!fw_csr)
                        intel_power_domains_init_hw(dev_priv, true);

                goto out;
        }

        pci_disable_device(drm_dev->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_INFO(dev_priv)->gen < 6))
                pci_set_power_state(drm_dev->pdev, PCI_D3hot);

        dev_priv->suspended_to_idle = suspend_to_idle(dev_priv);

out:
        enable_rpm_wakeref_asserts(dev_priv);

        return ret;
}

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

        if (!dev || !dev->dev_private) {
                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 = dev->dev_private;

        disable_rpm_wakeref_asserts(dev_priv);

        mutex_lock(&dev->struct_mutex);
        i915_gem_restore_gtt_mappings(dev);
        mutex_unlock(&dev->struct_mutex);

        i915_restore_state(dev);
        intel_opregion_setup(dev);

        intel_init_pch_refclk(dev);
        drm_mode_config_reset(dev);

        /*
         * 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.
         *
         * Modeset enabling in intel_modeset_init_hw() also needs working
         * interrupts.
         */
        intel_runtime_pm_enable_interrupts(dev_priv);

        mutex_lock(&dev->struct_mutex);
        if (i915_gem_init_hw(dev)) {
                DRM_ERROR("failed to re-initialize GPU, declaring wedged!\n");
                        atomic_or(I915_WEDGED, &dev_priv->gpu_error.reset_counter);
        }
        mutex_unlock(&dev->struct_mutex);

        intel_guc_resume(dev);

        intel_modeset_init_hw(dev);

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

        intel_dp_mst_resume(dev);

        intel_display_resume(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 loose hotplug
         * notifications.
         * */
        intel_hpd_init(dev_priv);
        /* Config may have changed between suspend and resume */
        drm_helper_hpd_irq_event(dev);

        intel_opregion_init(dev);

        intel_fbdev_set_suspend(dev, FBINFO_STATE_RUNNING, false);

        mutex_lock(&dev_priv->modeset_restore_lock);
        dev_priv->modeset_restore = MODESET_DONE;
        mutex_unlock(&dev_priv->modeset_restore_lock);

        intel_opregion_notify_adapter(dev, PCI_D0);

        drm_kms_helper_poll_enable(dev);

        enable_rpm_wakeref_asserts(dev_priv);

        return 0;
}

static int i915_drm_resume_early(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        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(dev->pdev, PCI_D0);
        if (ret) {
                DRM_ERROR("failed to set PCI D0 power state (%d)\n", ret);
                goto out;
        }

        /*
         * 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(dev->pdev)) {
                ret = -EIO;
                goto out;
        }

        pci_set_master(dev->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_early_sanitize(dev, true);

        if (IS_BROXTON(dev))
                ret = bxt_resume_prepare(dev_priv);
        else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
                hsw_disable_pc8(dev_priv);

        intel_uncore_sanitize(dev);

        if (!(dev_priv->suspended_to_idle && dev_priv->csr.dmc_payload))
                intel_power_domains_init_hw(dev_priv, true);

out:
        dev_priv->suspended_to_idle = false;

        enable_rpm_wakeref_asserts(dev_priv);

        return ret;
}

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);
}

/**
 * i915_reset - reset chip after a hang
 * @dev: drm device to reset
 *
 * Reset the chip.  Useful if a hang is detected. Returns zero on successful
 * reset or otherwise an error code.
 *
 * Procedure is fairly simple:
 *   - reset the chip using the reset reg
 *   - re-init context state
 *   - re-init hardware status page
 *   - re-init ring buffer
 *   - re-init interrupt state
 *   - re-init display
 */
int i915_reset(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        bool simulated;
        int ret;

        intel_reset_gt_powersave(dev);

        mutex_lock(&dev->struct_mutex);

        i915_gem_reset(dev);

        simulated = dev_priv->gpu_error.stop_rings != 0;

        ret = intel_gpu_reset(dev);

        /* Also reset the gpu hangman. */
        if (simulated) {
                DRM_INFO("Simulated gpu hang, resetting stop_rings\n");
                dev_priv->gpu_error.stop_rings = 0;
                if (ret == -ENODEV) {
                        DRM_INFO("Reset not implemented, but ignoring "
                                 "error for simulated gpu hangs\n");
                        ret = 0;
                }
        }

        if (i915_stop_ring_allow_warn(dev_priv))
                pr_notice("drm/i915: Resetting chip after gpu hang\n");

        if (ret) {
                DRM_ERROR("Failed to reset chip: %i\n", ret);
                mutex_unlock(&dev->struct_mutex);
                return ret;
        }

        intel_overlay_reset(dev_priv);

        /* Ok, now get things going again... */

        /*
         * Everything depends on having the GTT running, so we need to start
         * there.  Fortunately we don't need to do this unless we reset the
         * chip at a PCI level.
         *
         * Next we need to restore the context, but we don't use those
         * yet either...
         *
         * Ring buffer needs to be re-initialized in the KMS case, or if X
         * was running at the time of the reset (i.e. we weren't VT
         * switched away).
         */

        /* Used to prevent gem_check_wedged returning -EAGAIN during gpu reset */
        dev_priv->gpu_error.reload_in_reset = true;

        ret = i915_gem_init_hw(dev);

        dev_priv->gpu_error.reload_in_reset = false;

        mutex_unlock(&dev->struct_mutex);
        if (ret) {
                DRM_ERROR("Failed hw init on reset %d\n", ret);
                return ret;
        }

        /*
         * rps/rc6 re-init is necessary to restore state lost after the
         * reset and the re-install of gt irqs. Skip for ironlake per
         * previous concerns that it doesn't respond well to some forms
         * of re-init after reset.
         */
        if (INTEL_INFO(dev)->gen > 5)
                intel_enable_gt_powersave(dev);

        return 0;
}

static int i915_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
        struct intel_device_info *intel_info =
                (struct intel_device_info *) ent->driver_data;

        if (IS_PRELIMINARY_HW(intel_info) && !i915.preliminary_hw_support) {
                DRM_INFO("This hardware requires preliminary hardware support.\n"
                         "See CONFIG_DRM_I915_PRELIMINARY_HW_SUPPORT, and/or modparam preliminary_hw_support\n");
                return -ENODEV;
        }

        /* Only bind to function 0 of the device. Early generations
         * used function 1 as a placeholder for multi-head. This causes
         * us confusion instead, especially on the systems where both
         * functions have the same PCI-ID!
         */
        if (PCI_FUNC(pdev->devfn))
                return -ENODEV;

        /*
         * apple-gmux is needed on dual GPU MacBook Pro
         * to probe the panel if we're the inactive GPU.
         */

        if (IS_ENABLED(CONFIG_VGA_ARB) && IS_ENABLED(CONFIG_VGA_SWITCHEROO) &&
            apple_gmux_present() && pdev != vga_default_device() &&
            !vga_switcheroo_handler_flags())
                return -EPROBE_DEFER;

        return drm_get_pci_dev(pdev, ent, &driver);
}

static void
i915_pci_remove(struct pci_dev *pdev)
{
        struct drm_device *dev = pci_get_drvdata(pdev);

        drm_put_dev(dev);
}

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

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

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

        return i915_drm_suspend(drm_dev);
}

static int i915_pm_suspend_late(struct device *dev)
{
        struct drm_device *drm_dev = dev_to_i915(dev)->dev;

        /*
         * 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 (drm_dev->switch_power_state == DRM_SWITCH_POWER_OFF)
                return 0;

        return i915_drm_suspend_late(drm_dev, false);
}

static int i915_pm_poweroff_late(struct device *dev)
{
        struct drm_device *drm_dev = dev_to_i915(dev)->dev;

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

        return i915_drm_suspend_late(drm_dev, true);
}

static int i915_pm_resume_early(struct device *dev)
{
        struct drm_device *drm_dev = dev_to_i915(dev)->dev;

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

        return i915_drm_resume_early(drm_dev);
}

static int i915_pm_resume(struct device *dev)
{
        struct drm_device *drm_dev = dev_to_i915(dev)->dev;

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

        return i915_drm_resume(drm_dev);
}

static int hsw_suspend_complete(struct drm_i915_private *dev_priv)
{
        hsw_enable_pc8(dev_priv);

        return 0;
}

static int bxt_suspend_complete(struct drm_i915_private *dev_priv)
{
        struct drm_device *dev = dev_priv->dev;

        /* TODO: when DC5 support is added disable DC5 here. */

        broxton_ddi_phy_uninit(dev);
        broxton_uninit_cdclk(dev);
        bxt_enable_dc9(dev_priv);

        return 0;
}

static int bxt_resume_prepare(struct drm_i915_private *dev_priv)
{
        struct drm_device *dev = dev_priv->dev;

        /* TODO: when CSR FW support is added make sure the FW is loaded */

        bxt_disable_dc9(dev_priv);

        /*
         * TODO: when DC5 support is added enable DC5 here if the CSR FW
         * is available.
         */
        broxton_init_cdclk(dev);
        broxton_ddi_phy_init(dev);

        return 0;
}

/*
 * 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);
}

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

#define COND (I915_READ(VLV_GTLC_SURVIVABILITY_REG) & VLV_GFX_CLK_STATUS_BIT)

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

        return err;
#undef COND
}

static int vlv_allow_gt_wake(struct drm_i915_private *dev_priv, bool allow)
{
        u32 val;
        int err = 0;

        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);

#define COND (!!(I915_READ(VLV_GTLC_PW_STATUS) & VLV_GTLC_ALLOWWAKEACK) == \
              allow)
        err = wait_for(COND, 1);
        if (err)
                DRM_ERROR("timeout disabling GT waking\n");
        return err;
#undef COND
}

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

        mask = VLV_GTLC_PW_MEDIA_STATUS_MASK | VLV_GTLC_PW_RENDER_STATUS_MASK;
        val = wait_for_on ? mask : 0;
#define COND ((I915_READ(VLV_GTLC_PW_STATUS) & mask) == val)
        if (COND)
                return 0;

        DRM_DEBUG_KMS("waiting for GT wells to go %s (%08x)\n",
                      onoff(wait_for_on),
                      I915_READ(VLV_GTLC_PW_STATUS));

        /*
         * RC6 transitioning can be delayed up to 2 msec (see
         * valleyview_enable_rps), use 3 msec for safety.
         */
        err = wait_for(COND, 3);
        if (err)
                DRM_ERROR("timeout waiting for GT wells to go %s\n",
                          onoff(wait_for_on));

        return err;
#undef COND
}

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.
         */
        (void)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->dev))
                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)
{
        struct drm_device *dev = dev_priv->dev;
        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->dev))
                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);
                i915_gem_restore_fences(dev);
        }

        return ret;
}

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

        if (WARN_ON_ONCE(!(dev_priv->rps.enabled && intel_enable_rc6(dev))))
                return -ENODEV;

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

        DRM_DEBUG_KMS("Suspending device\n");

        /*
         * We could deadlock here in case another thread holding struct_mutex
         * calls RPM suspend concurrently, since the RPM suspend will wait
         * first for this RPM suspend to finish. In this case the concurrent
         * RPM resume will be followed by its RPM suspend counterpart. Still
         * for consistency return -EAGAIN, which will reschedule this suspend.
         */
        if (!mutex_trylock(&dev->struct_mutex)) {
                DRM_DEBUG_KMS("device lock contention, deffering suspend\n");
                /*
                 * Bump the expiration timestamp, otherwise the suspend won't
                 * be rescheduled.
                 */
                pm_runtime_mark_last_busy(device);

                return -EAGAIN;
        }

        disable_rpm_wakeref_asserts(dev_priv);

        /*
         * We are safe here against re-faults, since the fault handler takes
         * an RPM reference.
         */
        i915_gem_release_all_mmaps(dev_priv);
        mutex_unlock(&dev->struct_mutex);

        cancel_delayed_work_sync(&dev_priv->gpu_error.hangcheck_work);

        intel_guc_suspend(dev);

        intel_suspend_gt_powersave(dev);
        intel_runtime_pm_disable_interrupts(dev_priv);

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

                enable_rpm_wakeref_asserts(dev_priv);

                return ret;
        }

        intel_uncore_forcewake_reset(dev, false);

        enable_rpm_wakeref_asserts(dev_priv);
        WARN_ON_ONCE(atomic_read(&dev_priv->pm.wakeref_count));

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

        dev_priv->pm.suspended = true;

        /*
         * FIXME: We really should find a document that references the arguments
         * used below!
         */
        if (IS_BROADWELL(dev)) {
                /*
                 * 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, 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, PCI_D1);
        }

        assert_forcewakes_inactive(dev_priv);

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

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

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

        DRM_DEBUG_KMS("Resuming device\n");

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

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

        intel_guc_resume(dev);

        if (IS_GEN6(dev_priv))
                intel_init_pch_refclk(dev);

        if (IS_BROXTON(dev))
                ret = bxt_resume_prepare(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);

        /*
         * 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);
        gen6_update_ring_freq(dev);

        intel_runtime_pm_enable_interrupts(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_gt_powersave(dev);

        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;
}

/*
 * This function implements common functionality of runtime and system
 * suspend sequence.
 */
static int intel_suspend_complete(struct drm_i915_private *dev_priv)
{
        int ret;

        if (IS_BROXTON(dev_priv))
                ret = bxt_suspend_complete(dev_priv);
        else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
                ret = hsw_suspend_complete(dev_priv);
        else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
                ret = vlv_suspend_complete(dev_priv);
        else
                ret = 0;

        return ret;
}

static const struct dev_pm_ops i915_pm_ops = {
        /*
         * S0ix (via system suspend) and S3 event handlers [PMSG_SUSPEND,
         * PMSG_RESUME]
         */
        .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_suspend,
        .freeze_late = i915_pm_suspend_late,
        .thaw_early = i915_pm_resume_early,
        .thaw = i915_pm_resume,
        .poweroff = i915_pm_suspend,
        .poweroff_late = i915_pm_poweroff_late,
        .restore_early = i915_pm_resume_early,
        .restore = i915_pm_resume,

        /* 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,
#ifdef CONFIG_COMPAT
        .compat_ioctl = i915_compat_ioctl,
#endif
        .llseek = noop_llseek,
};

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_HAVE_IRQ | DRIVER_IRQ_SHARED | DRIVER_GEM | DRIVER_PRIME |
            DRIVER_RENDER | DRIVER_MODESET,
        .load = i915_driver_load,
        .unload = i915_driver_unload,
        .open = i915_driver_open,
        .lastclose = i915_driver_lastclose,
        .preclose = i915_driver_preclose,
        .postclose = i915_driver_postclose,
        .set_busid = drm_pci_set_busid,

#if defined(CONFIG_DEBUG_FS)
        .debugfs_init = i915_debugfs_init,
        .debugfs_cleanup = i915_debugfs_cleanup,
#endif
        .gem_free_object = 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,
        .dumb_destroy = drm_gem_dumb_destroy,
        .ioctls = i915_ioctls,
        .fops = &i915_driver_fops,
        .name = DRIVER_NAME,
        .desc = DRIVER_DESC,
        .date = DRIVER_DATE,
        .major = DRIVER_MAJOR,
        .minor = DRIVER_MINOR,
        .patchlevel = DRIVER_PATCHLEVEL,
};

static struct pci_driver i915_pci_driver = {
        .name = DRIVER_NAME,
        .id_table = pciidlist,
        .probe = i915_pci_probe,
        .remove = i915_pci_remove,
        .driver.pm = &i915_pm_ops,
};

static int __init i915_init(void)
{
        driver.num_ioctls = i915_max_ioctl;

        /*
         * Enable KMS by default, unless explicitly overriden by
         * either the i915.modeset prarameter or by the
         * vga_text_mode_force boot option.
         */

        if (i915.modeset == 0)
                driver.driver_features &= ~DRIVER_MODESET;

#ifdef CONFIG_VGA_CONSOLE
        if (vgacon_text_force() && i915.modeset == -1)
                driver.driver_features &= ~DRIVER_MODESET;
#endif

        if (!(driver.driver_features & DRIVER_MODESET)) {
                /* Silently fail loading to not upset userspace. */
                DRM_DEBUG_DRIVER("KMS and UMS disabled.\n");
                return 0;
        }

        if (i915.nuclear_pageflip)
                driver.driver_features |= DRIVER_ATOMIC;

        return drm_pci_init(&driver, &i915_pci_driver);
}

static void __exit i915_exit(void)
{
        if (!(driver.driver_features & DRIVER_MODESET))
                return; /* Never loaded a driver. */

        drm_pci_exit(&driver, &i915_pci_driver);
}

module_init(i915_init);
module_exit(i915_exit);

MODULE_AUTHOR("Tungsten Graphics, Inc.");
MODULE_AUTHOR("Intel Corporation");

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL and additional rights");