drm/i915: Mark the context and address space as closed

[linux/fpc-iii.git] / drivers / gpu / drm / i915 / i915_drv.c

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

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

#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include <drm/i915_drm.h>

#include "i915_drv.h"
#include "i915_trace.h"
#include "i915_vgpu.h"
#include "intel_drv.h"

static struct drm_driver driver;

static unsigned int i915_load_fail_count;

bool __i915_inject_load_failure(const char *func, int line)
{
        if (i915_load_fail_count >= i915.inject_load_failure)
                return false;

        if (++i915_load_fail_count == i915.inject_load_failure) {
                DRM_INFO("Injecting failure at checkpoint %u [%s:%d]\n",
                         i915.inject_load_failure, func, line);
                return true;
        }

        return false;
}

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

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

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

        va_start(args, fmt);

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

        dev_printk(level, dev, "[" DRM_NAME ":%ps] %pV",
                   __builtin_return_address(0), &vaf);

        if (is_error && !shown_bug_once) {
                dev_notice(dev, "%s", FDO_BUG_MSG);
                shown_bug_once = true;
        }

        va_end(args);
}

static bool i915_error_injected(struct drm_i915_private *dev_priv)
{
        return i915.inject_load_failure &&
               i915_load_fail_count == i915.inject_load_failure;
}

#define i915_load_error(dev_priv, fmt, ...)                                  \
        __i915_printk(dev_priv,                                              \
                      i915_error_injected(dev_priv) ? KERN_DEBUG : KERN_ERR, \
                      fmt, ##__VA_ARGS__)


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;
}

static void intel_detect_pch(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        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_KBP_DEVICE_ID_TYPE) {
                                dev_priv->pch_type = PCH_KBP;
                                DRM_DEBUG_KMS("Found KabyPoint PCH\n");
                                WARN_ON(!IS_KABYLAKE(dev));
                        } else if ((id == INTEL_PCH_P2X_DEVICE_ID_TYPE) ||
                                   (id == INTEL_PCH_P3X_DEVICE_ID_TYPE) ||
                                   ((id == INTEL_PCH_QEMU_DEVICE_ID_TYPE) &&
                                    pch->subsystem_vendor ==
                                            PCI_SUBVENDOR_ID_REDHAT_QUMRANET &&
                                    pch->subsystem_device ==
                                            PCI_SUBDEVICE_ID_QEMU)) {
                                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);
}

static int i915_getparam(struct drm_device *dev, void *data,
                         struct drm_file *file_priv)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        drm_i915_getparam_t *param = data;
        int value;

        switch (param->param) {
        case I915_PARAM_IRQ_ACTIVE:
        case I915_PARAM_ALLOW_BATCHBUFFER:
        case I915_PARAM_LAST_DISPATCH:
                /* Reject all old ums/dri params. */
                return -ENODEV;
        case I915_PARAM_CHIPSET_ID:
                value = dev->pdev->device;
                break;
        case I915_PARAM_REVISION:
                value = dev->pdev->revision;
                break;
        case I915_PARAM_HAS_GEM:
                value = 1;
                break;
        case I915_PARAM_NUM_FENCES_AVAIL:
                value = dev_priv->num_fence_regs;
                break;
        case I915_PARAM_HAS_OVERLAY:
                value = dev_priv->overlay ? 1 : 0;
                break;
        case I915_PARAM_HAS_PAGEFLIPPING:
                value = 1;
                break;
        case I915_PARAM_HAS_EXECBUF2:
                /* depends on GEM */
                value = 1;
                break;
        case I915_PARAM_HAS_BSD:
                value = intel_engine_initialized(&dev_priv->engine[VCS]);
                break;
        case I915_PARAM_HAS_BLT:
                value = intel_engine_initialized(&dev_priv->engine[BCS]);
                break;
        case I915_PARAM_HAS_VEBOX:
                value = intel_engine_initialized(&dev_priv->engine[VECS]);
                break;
        case I915_PARAM_HAS_BSD2:
                value = intel_engine_initialized(&dev_priv->engine[VCS2]);
                break;
        case I915_PARAM_HAS_RELAXED_FENCING:
                value = 1;
                break;
        case I915_PARAM_HAS_COHERENT_RINGS:
                value = 1;
                break;
        case I915_PARAM_HAS_EXEC_CONSTANTS:
                value = INTEL_INFO(dev)->gen >= 4;
                break;
        case I915_PARAM_HAS_RELAXED_DELTA:
                value = 1;
                break;
        case I915_PARAM_HAS_GEN7_SOL_RESET:
                value = 1;
                break;
        case I915_PARAM_HAS_LLC:
                value = HAS_LLC(dev);
                break;
        case I915_PARAM_HAS_WT:
                value = HAS_WT(dev);
                break;
        case I915_PARAM_HAS_ALIASING_PPGTT:
                value = USES_PPGTT(dev);
                break;
        case I915_PARAM_HAS_WAIT_TIMEOUT:
                value = 1;
                break;
        case I915_PARAM_HAS_SEMAPHORES:
                value = i915.semaphores;
                break;
        case I915_PARAM_HAS_PRIME_VMAP_FLUSH:
                value = 1;
                break;
        case I915_PARAM_HAS_SECURE_BATCHES:
                value = capable(CAP_SYS_ADMIN);
                break;
        case I915_PARAM_HAS_PINNED_BATCHES:
                value = 1;
                break;
        case I915_PARAM_HAS_EXEC_NO_RELOC:
                value = 1;
                break;
        case I915_PARAM_HAS_EXEC_HANDLE_LUT:
                value = 1;
                break;
        case I915_PARAM_CMD_PARSER_VERSION:
                value = i915_cmd_parser_get_version(dev_priv);
                break;
        case I915_PARAM_HAS_COHERENT_PHYS_GTT:
                value = 1;
                break;
        case I915_PARAM_MMAP_VERSION:
                value = 1;
                break;
        case I915_PARAM_SUBSLICE_TOTAL:
                value = INTEL_INFO(dev)->subslice_total;
                if (!value)
                        return -ENODEV;
                break;
        case I915_PARAM_EU_TOTAL:
                value = INTEL_INFO(dev)->eu_total;
                if (!value)
                        return -ENODEV;
                break;
        case I915_PARAM_HAS_GPU_RESET:
                value = i915.enable_hangcheck && intel_has_gpu_reset(dev_priv);
                break;
        case I915_PARAM_HAS_RESOURCE_STREAMER:
                value = HAS_RESOURCE_STREAMER(dev);
                break;
        case I915_PARAM_HAS_EXEC_SOFTPIN:
                value = 1;
                break;
        case I915_PARAM_HAS_POOLED_EU:
                value = HAS_POOLED_EU(dev);
                break;
        case I915_PARAM_MIN_EU_IN_POOL:
                value = INTEL_INFO(dev)->min_eu_in_pool;
                break;
        default:
                DRM_DEBUG("Unknown parameter %d\n", param->param);
                return -EINVAL;
        }

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

        return 0;
}

static int i915_get_bridge_dev(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);

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

/* Allocate space for the MCH regs if needed, return nonzero on error */
static int
intel_alloc_mchbar_resource(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        int reg = INTEL_INFO(dev)->gen >= 4 ? MCHBAR_I965 : MCHBAR_I915;
        u32 temp_lo, temp_hi = 0;
        u64 mchbar_addr;
        int ret;

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

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

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

        if (INTEL_INFO(dev)->gen >= 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_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        int mchbar_reg = INTEL_INFO(dev)->gen >= 4 ? MCHBAR_I965 : MCHBAR_I915;
        u32 temp;
        bool enabled;

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

        dev_priv->mchbar_need_disable = false;

        if (IS_I915G(dev) || IS_I915GM(dev)) {
                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))
                return;

        dev_priv->mchbar_need_disable = true;

        /* Space is allocated or reserved, so enable it. */
        if (IS_I915G(dev) || IS_I915GM(dev)) {
                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_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        int mchbar_reg = INTEL_INFO(dev)->gen >= 4 ? MCHBAR_I965 : MCHBAR_I915;

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

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

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

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

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

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

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

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

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

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

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

static void i915_gem_fini(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);

        /*
         * Neither the BIOS, ourselves or any other kernel
         * expects the system to be in execlists mode on startup,
         * so we need to reset the GPU back to legacy mode. And the only
         * known way to disable logical contexts is through a GPU reset.
         *
         * So in order to leave the system in a known default configuration,
         * always reset the GPU upon unload. Afterwards we then clean up the
         * GEM state tracking, flushing off the requests and leaving the
         * system in a known idle state.
         *
         * Note that is of the upmost importance that the GPU is idle and
         * all stray writes are flushed *before* we dismantle the backing
         * storage for the pinned objects.
         *
         * However, since we are uncertain that reseting the GPU on older
         * machines is a good idea, we don't - just in case it leaves the
         * machine in an unusable condition.
         */
        if (HAS_HW_CONTEXTS(dev)) {
                int reset = intel_gpu_reset(dev_priv, ALL_ENGINES);
                WARN_ON(reset && reset != -ENODEV);
        }

        mutex_lock(&dev->struct_mutex);
        i915_gem_reset(dev);
        i915_gem_cleanup_engines(dev);
        i915_gem_context_fini(dev);
        mutex_unlock(&dev->struct_mutex);

        WARN_ON(!list_empty(&to_i915(dev)->context_list));
}

static int i915_load_modeset_init(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        int ret;

        if (i915_inject_load_failure())
                return -ENODEV;

        ret = intel_bios_init(dev_priv);
        if (ret)
                DRM_INFO("failed to find VBIOS tables\n");

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

        intel_register_dsm_handler();

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

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

        intel_power_domains_init_hw(dev_priv, false);

        intel_csr_ucode_init(dev_priv);

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

        intel_setup_gmbus(dev);

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

        intel_guc_init(dev);

        ret = i915_gem_init(dev);
        if (ret)
                goto cleanup_irq;

        intel_modeset_gem_init(dev);

        if (INTEL_INFO(dev)->num_pipes == 0)
                return 0;

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

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

        drm_kms_helper_poll_init(dev);

        return 0;

cleanup_gem:
        i915_gem_fini(dev);
cleanup_irq:
        intel_guc_fini(dev);
        drm_irq_uninstall(dev);
        intel_teardown_gmbus(dev);
cleanup_csr:
        intel_csr_ucode_fini(dev_priv);
        intel_power_domains_fini(dev_priv);
        vga_switcheroo_unregister_client(dev->pdev);
cleanup_vga_client:
        vga_client_register(dev->pdev, NULL, NULL, NULL);
out:
        return ret;
}

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

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

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

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

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

        kfree(ap);

        return ret;
}
#else
static int i915_kick_out_firmware_fb(struct drm_i915_private *dev_priv)
{
        return 0;
}
#endif

#if !defined(CONFIG_VGA_CONSOLE)
static int i915_kick_out_vgacon(struct drm_i915_private *dev_priv)
{
        return 0;
}
#elif !defined(CONFIG_DUMMY_CONSOLE)
static int i915_kick_out_vgacon(struct drm_i915_private *dev_priv)
{
        return -ENODEV;
}
#else
static int i915_kick_out_vgacon(struct drm_i915_private *dev_priv)
{
        int ret = 0;

        DRM_INFO("Replacing VGA console driver\n");

        console_lock();
        if (con_is_bound(&vga_con))
                ret = do_take_over_console(&dummy_con, 0, MAX_NR_CONSOLES - 1, 1);
        if (ret == 0) {
                ret = do_unregister_con_driver(&vga_con);

                /* Ignore "already unregistered". */
                if (ret == -ENODEV)
                        ret = 0;
        }
        console_unlock();

        return ret;
}
#endif

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

static int i915_workqueues_init(struct drm_i915_private *dev_priv)
{
        /*
         * The i915 workqueue is primarily used for batched retirement of
         * requests (and thus managing bo) once the task has been completed
         * by the GPU. i915_gem_retire_requests() is called directly when we
         * need high-priority retirement, such as waiting for an explicit
         * bo.
         *
         * It is also used for periodic low-priority events, such as
         * idle-timers and recording error state.
         *
         * All tasks on the workqueue are expected to acquire the dev mutex
         * so there is no point in running more than one instance of the
         * workqueue at any time.  Use an ordered one.
         */
        dev_priv->wq = alloc_ordered_workqueue("i915", 0);
        if (dev_priv->wq == NULL)
                goto out_err;

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

        return 0;

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

        return -ENOMEM;
}

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

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

        if (i915_inject_load_failure())
                return -ENODEV;

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

        BUG_ON(device_info->gen > sizeof(device_info->gen_mask) * BITS_PER_BYTE);
        device_info->gen_mask = BIT(device_info->gen - 1);

        spin_lock_init(&dev_priv->irq_lock);
        spin_lock_init(&dev_priv->gpu_error.lock);
        mutex_init(&dev_priv->backlight_lock);
        spin_lock_init(&dev_priv->uncore.lock);
        spin_lock_init(&dev_priv->mm.object_stat_lock);
        spin_lock_init(&dev_priv->mmio_flip_lock);
        mutex_init(&dev_priv->sb_lock);
        mutex_init(&dev_priv->modeset_restore_lock);
        mutex_init(&dev_priv->av_mutex);
        mutex_init(&dev_priv->wm.wm_mutex);
        mutex_init(&dev_priv->pps_mutex);

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

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

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

        intel_pm_setup(&dev_priv->drm);
        intel_init_dpio(dev_priv);
        intel_power_domains_init(dev_priv);
        intel_irq_init(dev_priv);
        intel_init_display_hooks(dev_priv);
        intel_init_clock_gating_hooks(dev_priv);
        intel_init_audio_hooks(dev_priv);
        i915_gem_load_init(&dev_priv->drm);

        intel_display_crc_init(&dev_priv->drm);

        intel_device_info_dump(dev_priv);

        /* Not all pre-production machines fall into this category, only the
         * very first ones. Almost everything should work, except for maybe
         * suspend/resume. And we don't implement workarounds that affect only
         * pre-production machines. */
        if (IS_HSW_EARLY_SDV(dev_priv))
                DRM_INFO("This is an early pre-production Haswell machine. "
                         "It may not be fully functional.\n");

        return 0;

err_workqueues:
        i915_workqueues_cleanup(dev_priv);
        return ret;
}

/**
 * i915_driver_cleanup_early - cleanup the setup done in i915_driver_init_early()
 * @dev_priv: device private
 */
static void i915_driver_cleanup_early(struct drm_i915_private *dev_priv)
{
        i915_gem_load_cleanup(&dev_priv->drm);
        i915_workqueues_cleanup(dev_priv);
}

static int i915_mmio_setup(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        int mmio_bar;
        int mmio_size;

        mmio_bar = IS_GEN2(dev) ? 1 : 0;
        /*
         * Before gen4, the registers and the GTT are behind different BARs.
         * However, from gen4 onwards, the registers and the GTT are shared
         * in the same BAR, so we want to restrict this ioremap from
         * clobbering the GTT which we want ioremap_wc instead. Fortunately,
         * the register BAR remains the same size for all the earlier
         * generations up to Ironlake.
         */
        if (INTEL_INFO(dev)->gen < 5)
                mmio_size = 512 * 1024;
        else
                mmio_size = 2 * 1024 * 1024;
        dev_priv->regs = pci_iomap(dev->pdev, mmio_bar, mmio_size);
        if (dev_priv->regs == NULL) {
                DRM_ERROR("failed to map registers\n");

                return -EIO;
        }

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

        return 0;
}

static void i915_mmio_cleanup(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);

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

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

        if (i915_inject_load_failure())
                return -ENODEV;

        if (i915_get_bridge_dev(dev))
                return -EIO;

        ret = i915_mmio_setup(dev);
        if (ret < 0)
                goto put_bridge;

        intel_uncore_init(dev_priv);

        return 0;

put_bridge:
        pci_dev_put(dev_priv->bridge_dev);

        return ret;
}

/**
 * i915_driver_cleanup_mmio - cleanup the setup done in i915_driver_init_mmio()
 * @dev_priv: device private
 */
static void i915_driver_cleanup_mmio(struct drm_i915_private *dev_priv)
{
        struct drm_device *dev = &dev_priv->drm;

        intel_uncore_fini(dev_priv);
        i915_mmio_cleanup(dev);
        pci_dev_put(dev_priv->bridge_dev);
}

static void intel_sanitize_options(struct drm_i915_private *dev_priv)
{
        i915.enable_execlists =
                intel_sanitize_enable_execlists(dev_priv,
                                                i915.enable_execlists);

        /*
         * i915.enable_ppgtt is read-only, so do an early pass to validate the
         * user's requested state against the hardware/driver capabilities.  We
         * do this now so that we can print out any log messages once rather
         * than every time we check intel_enable_ppgtt().
         */
        i915.enable_ppgtt =
                intel_sanitize_enable_ppgtt(dev_priv, i915.enable_ppgtt);
        DRM_DEBUG_DRIVER("ppgtt mode: %i\n", i915.enable_ppgtt);

        i915.semaphores = intel_sanitize_semaphores(dev_priv, i915.semaphores);
        DRM_DEBUG_DRIVER("use GPU sempahores? %s\n", yesno(i915.semaphores));
}

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

        if (i915_inject_load_failure())
                return -ENODEV;

        intel_device_info_runtime_init(dev_priv);

        intel_sanitize_options(dev_priv);

        ret = i915_ggtt_probe_hw(dev_priv);
        if (ret)
                return ret;

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

        ret = i915_kick_out_vgacon(dev_priv);
        if (ret) {
                DRM_ERROR("failed to remove conflicting VGA console\n");
                goto out_ggtt;
        }

        ret = i915_ggtt_init_hw(dev_priv);
        if (ret)
                return ret;

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

        pci_set_master(dev->pdev);

        /* overlay on gen2 is broken and can't address above 1G */
        if (IS_GEN2(dev)) {
                ret = dma_set_coherent_mask(&dev->pdev->dev, DMA_BIT_MASK(30));
                if (ret) {
                        DRM_ERROR("failed to set DMA mask\n");

                        goto out_ggtt;
                }
        }

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

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

                        goto out_ggtt;
                }
        }

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

        intel_uncore_sanitize(dev_priv);

        intel_opregion_setup(dev_priv);

        i915_gem_load_init_fences(dev_priv);

        /* On the 945G/GM, the chipset reports the MSI capability on the
         * integrated graphics even though the support isn't actually there
         * according to the published specs.  It doesn't appear to function
         * correctly in testing on 945G.
         * This may be a side effect of MSI having been made available for PEG
         * and the registers being closely associated.
         *
         * According to chipset errata, on the 965GM, MSI interrupts may
         * be lost or delayed, but we use them anyways to avoid
         * stuck interrupts on some machines.
         */
        if (!IS_I945G(dev) && !IS_I945GM(dev)) {
                if (pci_enable_msi(dev->pdev) < 0)
                        DRM_DEBUG_DRIVER("can't enable MSI");
        }

        return 0;

out_ggtt:
        i915_ggtt_cleanup_hw(dev_priv);

        return ret;
}

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

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

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

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

        i915_gem_shrinker_init(dev_priv);

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

        /* Reveal our presence to userspace */
        if (drm_dev_register(dev, 0) == 0) {
                i915_debugfs_register(dev_priv);
                i915_setup_sysfs(dev);
        } else
                DRM_ERROR("Failed to register driver for userspace access!\n");

        if (INTEL_INFO(dev_priv)->num_pipes) {
                /* Must be done after probing outputs */
                intel_opregion_register(dev_priv);
                acpi_video_register();
        }

        if (IS_GEN5(dev_priv))
                intel_gpu_ips_init(dev_priv);

        i915_audio_component_init(dev_priv);

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

/**
 * 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_audio_component_cleanup(dev_priv);

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

        i915_teardown_sysfs(&dev_priv->drm);
        i915_debugfs_unregister(dev_priv);
        drm_dev_unregister(&dev_priv->drm);

        i915_gem_shrinker_cleanup(dev_priv);
}

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

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

        ret = -ENOMEM;
        dev_priv = kzalloc(sizeof(*dev_priv), GFP_KERNEL);
        if (dev_priv)
                ret = drm_dev_init(&dev_priv->drm, &driver, &pdev->dev);
        if (ret) {
                dev_printk(KERN_ERR, &pdev->dev,
                           "[" DRM_NAME ":%s] allocation failed\n", __func__);
                kfree(dev_priv);
                return ret;
        }

        dev_priv->drm.pdev = pdev;
        dev_priv->drm.dev_private = dev_priv;

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

        pci_set_drvdata(pdev, &dev_priv->drm);

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

        intel_runtime_pm_get(dev_priv);

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

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

        /*
         * TODO: move the vblank init and parts of modeset init steps into one
         * of the i915_driver_init_/i915_driver_register functions according
         * to the role/effect of the given init step.
         */
        if (INTEL_INFO(dev_priv)->num_pipes) {
                ret = drm_vblank_init(&dev_priv->drm,
                                      INTEL_INFO(dev_priv)->num_pipes);
                if (ret)
                        goto out_cleanup_hw;
        }

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

        i915_driver_register(dev_priv);

        intel_runtime_pm_enable(dev_priv);

        intel_runtime_pm_put(dev_priv);

        return 0;

out_cleanup_vblank:
        drm_vblank_cleanup(&dev_priv->drm);
out_cleanup_hw:
        i915_driver_cleanup_hw(dev_priv);
out_cleanup_mmio:
        i915_driver_cleanup_mmio(dev_priv);
out_runtime_pm_put:
        intel_runtime_pm_put(dev_priv);
        i915_driver_cleanup_early(dev_priv);
out_pci_disable:
        pci_disable_device(pdev);
out_free_priv:
        i915_load_error(dev_priv, "Device initialization failed (%d)\n", ret);
        drm_dev_unref(&dev_priv->drm);
        return ret;
}

void i915_driver_unload(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);

        intel_fbdev_fini(dev);

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

        intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);

        i915_driver_unregister(dev_priv);

        drm_vblank_cleanup(dev);

        intel_modeset_cleanup(dev);

        /*
         * free the memory space allocated for the child device
         * config parsed from VBT
         */
        if (dev_priv->vbt.child_dev && dev_priv->vbt.child_dev_num) {
                kfree(dev_priv->vbt.child_dev);
                dev_priv->vbt.child_dev = NULL;
                dev_priv->vbt.child_dev_num = 0;
        }
        kfree(dev_priv->vbt.sdvo_lvds_vbt_mode);
        dev_priv->vbt.sdvo_lvds_vbt_mode = NULL;
        kfree(dev_priv->vbt.lfp_lvds_vbt_mode);
        dev_priv->vbt.lfp_lvds_vbt_mode = NULL;

        vga_switcheroo_unregister_client(dev->pdev);
        vga_client_register(dev->pdev, NULL, NULL, NULL);

        intel_csr_ucode_fini(dev_priv);

        /* Free error state after interrupts are fully disabled. */
        cancel_delayed_work_sync(&dev_priv->gpu_error.hangcheck_work);
        i915_destroy_error_state(dev);

        /* Flush any outstanding unpin_work. */
        drain_workqueue(dev_priv->wq);

        intel_guc_fini(dev);
        i915_gem_fini(dev);
        intel_fbc_cleanup_cfb(dev_priv);

        intel_power_domains_fini(dev_priv);

        i915_driver_cleanup_hw(dev_priv);
        i915_driver_cleanup_mmio(dev_priv);

        intel_display_power_put(dev_priv, POWER_DOMAIN_INIT);

        i915_driver_cleanup_early(dev_priv);
}

static int i915_driver_open(struct drm_device *dev, struct drm_file *file)
{
        int ret;

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

        return 0;
}

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

static void i915_driver_preclose(struct drm_device *dev, struct drm_file *file)
{
        mutex_lock(&dev->struct_mutex);
        i915_gem_context_close(dev, file);
        i915_gem_release(dev, file);
        mutex_unlock(&dev->struct_mutex);
}

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

        kfree(file_priv);
}

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

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

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

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

static int i915_drm_suspend(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        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_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_priv, opregion_target_state);

        intel_uncore_forcewake_reset(dev_priv, false);
        intel_opregion_unregister(dev_priv);

        intel_fbdev_set_suspend(dev, FBINFO_STATE_SUSPENDED, true);

        dev_priv->suspend_count++;

        intel_display_set_init_power(dev_priv, false);

        intel_csr_ucode_suspend(dev_priv);

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 = to_i915(drm_dev);
        bool fw_csr;
        int ret;

        disable_rpm_wakeref_asserts(dev_priv);

        fw_csr = !IS_BROXTON(dev_priv) &&
                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 = 0;
        if (IS_BROXTON(dev_priv))
                bxt_enable_dc9(dev_priv);
        else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
                hsw_enable_pc8(dev_priv);
        else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
                ret = vlv_suspend_complete(dev_priv);

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

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

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

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

        return i915_drm_suspend_late(dev, false);
}

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

        disable_rpm_wakeref_asserts(dev_priv);

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

        intel_csr_ucode_resume(dev_priv);

        i915_gem_resume(dev);

        i915_restore_state(dev);
        intel_opregion_setup(dev_priv);

        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_priv);
        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_register(dev_priv);

        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_priv, PCI_D0);

        intel_autoenable_gt_powersave(dev_priv);
        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 = to_i915(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(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_priv, true);

        if (IS_BROXTON(dev_priv)) {
                if (!dev_priv->suspended_to_idle)
                        gen9_sanitize_dc_state(dev_priv);
                bxt_disable_dc9(dev_priv);
        } else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
                hsw_disable_pc8(dev_priv);
        }

        intel_uncore_sanitize(dev_priv);

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

        enable_rpm_wakeref_asserts(dev_priv);

out:
        dev_priv->suspended_to_idle = false;

        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_i915_private *dev_priv)
{
        struct drm_device *dev = &dev_priv->drm;
        struct i915_gpu_error *error = &dev_priv->gpu_error;
        unsigned reset_counter;
        int ret;

        mutex_lock(&dev->struct_mutex);

        /* Clear any previous failed attempts at recovery. Time to try again. */
        atomic_andnot(I915_WEDGED, &error->reset_counter);

        /* Clear the reset-in-progress flag and increment the reset epoch. */
        reset_counter = atomic_inc_return(&error->reset_counter);
        if (WARN_ON(__i915_reset_in_progress(reset_counter))) {
                ret = -EIO;
                goto error;
        }

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

        i915_gem_reset(dev);

        ret = intel_gpu_reset(dev_priv, ALL_ENGINES);
        if (ret) {
                if (ret != -ENODEV)
                        DRM_ERROR("Failed to reset chip: %i\n", ret);
                else
                        DRM_DEBUG_DRIVER("GPU reset disabled\n");
                goto error;
        }

        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).
         */
        ret = i915_gem_init_hw(dev);
        if (ret) {
                DRM_ERROR("Failed hw init on reset %d\n", ret);
                goto error;
        }

        mutex_unlock(&dev->struct_mutex);

        /*
         * 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.
         */
        intel_autoenable_gt_powersave(dev_priv);

        return 0;

error:
        atomic_or(I915_WEDGED, &error->reset_counter);
        mutex_unlock(&dev->struct_mutex);
        return ret;
}

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) {
                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)->drm;

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

        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)->drm;

        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)->drm;

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

        return i915_drm_resume(drm_dev);
}

/* freeze: before creating the hibernation_image */
static int i915_pm_freeze(struct device *dev)
{
        return i915_pm_suspend(dev);
}

static int i915_pm_freeze_late(struct device *dev)
{
        int ret;

        ret = i915_pm_suspend_late(dev);
        if (ret)
                return ret;

        ret = i915_gem_freeze_late(dev_to_i915(dev));
        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 *dev)
{
        return i915_pm_resume_early(dev);
}

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

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

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

/*
 * 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;

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

        if (!force_on)
                return 0;

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

        return err;
}

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

        err = intel_wait_for_register(dev_priv,
                                      VLV_GTLC_PW_STATUS,
                                      VLV_GTLC_ALLOWWAKEACK,
                                      allow,
                                      1);
        if (err)
                DRM_ERROR("timeout disabling GT waking\n");

        return err;
}

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;
        if ((I915_READ(VLV_GTLC_PW_STATUS) & mask) == val)
                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 = intel_wait_for_register(dev_priv,
                                      VLV_GTLC_PW_STATUS, mask, val,
                                      3);
        if (err)
                DRM_ERROR("timeout waiting for GT wells to go %s\n",
                          onoff(wait_for_on));

        return err;
}

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))
                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->drm;
        int err;
        int ret;

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

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

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

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

        vlv_check_no_gt_access(dev_priv);

        if (rpm_resume) {
                intel_init_clock_gating(dev);
                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 = to_i915(dev);
        int ret;

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

        intel_guc_suspend(dev);

        intel_runtime_pm_disable_interrupts(dev_priv);

        ret = 0;
        if (IS_BROXTON(dev_priv)) {
                bxt_display_core_uninit(dev_priv);
                bxt_enable_dc9(dev_priv);
        } else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
                hsw_enable_pc8(dev_priv);
        } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
                ret = vlv_suspend_complete(dev_priv);
        }

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

                enable_rpm_wakeref_asserts(dev_priv);

                return ret;
        }

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

        assert_forcewakes_inactive(dev_priv);

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

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

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

        if (WARN_ON_ONCE(!HAS_RUNTIME_PM(dev)))
                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_priv, 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)) {
                bxt_disable_dc9(dev_priv);
                bxt_display_core_init(dev_priv, true);
                if (dev_priv->csr.dmc_payload &&
                    (dev_priv->csr.allowed_dc_mask & DC_STATE_EN_UPTO_DC5))
                        gen9_enable_dc5(dev_priv);
        } else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
                hsw_disable_pc8(dev_priv);
        } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
                ret = vlv_resume_prepare(dev_priv, true);
        }

        /*
         * 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);

        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);

        enable_rpm_wakeref_asserts(dev_priv);

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

        return ret;
}

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

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

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

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

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

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

static const struct drm_ioctl_desc i915_ioctls[] = {
        DRM_IOCTL_DEF_DRV(I915_INIT, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF_DRV(I915_FLUSH, drm_noop, DRM_AUTH),
        DRM_IOCTL_DEF_DRV(I915_FLIP, drm_noop, DRM_AUTH),
        DRM_IOCTL_DEF_DRV(I915_BATCHBUFFER, drm_noop, DRM_AUTH),
        DRM_IOCTL_DEF_DRV(I915_IRQ_EMIT, drm_noop, DRM_AUTH),
        DRM_IOCTL_DEF_DRV(I915_IRQ_WAIT, drm_noop, DRM_AUTH),
        DRM_IOCTL_DEF_DRV(I915_GETPARAM, i915_getparam, DRM_AUTH|DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_SETPARAM, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF_DRV(I915_ALLOC, drm_noop, DRM_AUTH),
        DRM_IOCTL_DEF_DRV(I915_FREE, drm_noop, DRM_AUTH),
        DRM_IOCTL_DEF_DRV(I915_INIT_HEAP, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF_DRV(I915_CMDBUFFER, drm_noop, DRM_AUTH),
        DRM_IOCTL_DEF_DRV(I915_DESTROY_HEAP,  drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF_DRV(I915_SET_VBLANK_PIPE,  drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF_DRV(I915_GET_VBLANK_PIPE,  drm_noop, DRM_AUTH),
        DRM_IOCTL_DEF_DRV(I915_VBLANK_SWAP, drm_noop, DRM_AUTH),
        DRM_IOCTL_DEF_DRV(I915_HWS_ADDR, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF_DRV(I915_GEM_INIT, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF_DRV(I915_GEM_EXECBUFFER, i915_gem_execbuffer, DRM_AUTH),
        DRM_IOCTL_DEF_DRV(I915_GEM_EXECBUFFER2, i915_gem_execbuffer2, DRM_AUTH|DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_PIN, i915_gem_reject_pin_ioctl, DRM_AUTH|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF_DRV(I915_GEM_UNPIN, i915_gem_reject_pin_ioctl, DRM_AUTH|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF_DRV(I915_GEM_BUSY, i915_gem_busy_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_SET_CACHING, i915_gem_set_caching_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_GET_CACHING, i915_gem_get_caching_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_THROTTLE, i915_gem_throttle_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_ENTERVT, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF_DRV(I915_GEM_LEAVEVT, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF_DRV(I915_GEM_CREATE, i915_gem_create_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_PREAD, i915_gem_pread_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_PWRITE, i915_gem_pwrite_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_MMAP, i915_gem_mmap_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_MMAP_GTT, i915_gem_mmap_gtt_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_SET_DOMAIN, i915_gem_set_domain_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_SW_FINISH, i915_gem_sw_finish_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_SET_TILING, i915_gem_set_tiling, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_GET_TILING, i915_gem_get_tiling, 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, 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_CONTROL_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_OVERLAY_ATTRS, intel_overlay_attrs_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_SET_SPRITE_COLORKEY, intel_sprite_set_colorkey, DRM_MASTER|DRM_CONTROL_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GET_SPRITE_COLORKEY, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_WAIT, i915_gem_wait_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_CONTEXT_CREATE, i915_gem_context_create_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_CONTEXT_DESTROY, i915_gem_context_destroy_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_REG_READ, i915_reg_read_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GET_RESET_STATS, i915_gem_context_reset_stats_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_USERPTR, i915_gem_userptr_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_CONTEXT_GETPARAM, i915_gem_context_getparam_ioctl, DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_CONTEXT_SETPARAM, i915_gem_context_setparam_ioctl, DRM_RENDER_ALLOW),
};

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,
        .open = i915_driver_open,
        .lastclose = i915_driver_lastclose,
        .preclose = i915_driver_preclose,
        .postclose = i915_driver_postclose,
        .set_busid = drm_pci_set_busid,

        .gem_close_object = i915_gem_close_object,
        .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,
        .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,
};