[cascardo/linux.git] / drivers / gpu / drm / amd / amdgpu / amdgpu_device.c

/*
 * Copyright 2008 Advanced Micro Devices, Inc.
 * Copyright 2008 Red Hat Inc.
 * Copyright 2009 Jerome Glisse.
 *
 * 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, sublicense,
 * 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 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 NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
 *
 * Authors: Dave Airlie
 *          Alex Deucher
 *          Jerome Glisse
 */
#include <linux/kthread.h>
#include <linux/console.h>
#include <linux/slab.h>
#include <linux/debugfs.h>
#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include <drm/amdgpu_drm.h>
#include <linux/vgaarb.h>
#include <linux/vga_switcheroo.h>
#include <linux/efi.h>
#include "amdgpu.h"
#include "amdgpu_trace.h"
#include "amdgpu_i2c.h"
#include "atom.h"
#include "amdgpu_atombios.h"
#include "amd_pcie.h"
#ifdef CONFIG_DRM_AMDGPU_SI
#include "si.h"
#endif
#ifdef CONFIG_DRM_AMDGPU_CIK
#include "cik.h"
#endif
#include "vi.h"
#include "bif/bif_4_1_d.h"
#include <linux/pci.h>
#include <linux/firmware.h>

static int amdgpu_debugfs_regs_init(struct amdgpu_device *adev);
static void amdgpu_debugfs_regs_cleanup(struct amdgpu_device *adev);

static const char *amdgpu_asic_name[] = {
        "TAHITI",
        "PITCAIRN",
        "VERDE",
        "OLAND",
        "HAINAN",
        "BONAIRE",
        "KAVERI",
        "KABINI",
        "HAWAII",
        "MULLINS",
        "TOPAZ",
        "TONGA",
        "FIJI",
        "CARRIZO",
        "STONEY",
        "POLARIS10",
        "POLARIS11",
        "LAST",
};

bool amdgpu_device_is_px(struct drm_device *dev)
{
        struct amdgpu_device *adev = dev->dev_private;

        if (adev->flags & AMD_IS_PX)
                return true;
        return false;
}

/*
 * MMIO register access helper functions.
 */
uint32_t amdgpu_mm_rreg(struct amdgpu_device *adev, uint32_t reg,
                        bool always_indirect)
{
        uint32_t ret;

        if ((reg * 4) < adev->rmmio_size && !always_indirect)
                ret = readl(((void __iomem *)adev->rmmio) + (reg * 4));
        else {
                unsigned long flags;

                spin_lock_irqsave(&adev->mmio_idx_lock, flags);
                writel((reg * 4), ((void __iomem *)adev->rmmio) + (mmMM_INDEX * 4));
                ret = readl(((void __iomem *)adev->rmmio) + (mmMM_DATA * 4));
                spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
        }
        trace_amdgpu_mm_rreg(adev->pdev->device, reg, ret);
        return ret;
}

void amdgpu_mm_wreg(struct amdgpu_device *adev, uint32_t reg, uint32_t v,
                    bool always_indirect)
{
        trace_amdgpu_mm_wreg(adev->pdev->device, reg, v);

        if ((reg * 4) < adev->rmmio_size && !always_indirect)
                writel(v, ((void __iomem *)adev->rmmio) + (reg * 4));
        else {
                unsigned long flags;

                spin_lock_irqsave(&adev->mmio_idx_lock, flags);
                writel((reg * 4), ((void __iomem *)adev->rmmio) + (mmMM_INDEX * 4));
                writel(v, ((void __iomem *)adev->rmmio) + (mmMM_DATA * 4));
                spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
        }
}

u32 amdgpu_io_rreg(struct amdgpu_device *adev, u32 reg)
{
        if ((reg * 4) < adev->rio_mem_size)
                return ioread32(adev->rio_mem + (reg * 4));
        else {
                iowrite32((reg * 4), adev->rio_mem + (mmMM_INDEX * 4));
                return ioread32(adev->rio_mem + (mmMM_DATA * 4));
        }
}

void amdgpu_io_wreg(struct amdgpu_device *adev, u32 reg, u32 v)
{

        if ((reg * 4) < adev->rio_mem_size)
                iowrite32(v, adev->rio_mem + (reg * 4));
        else {
                iowrite32((reg * 4), adev->rio_mem + (mmMM_INDEX * 4));
                iowrite32(v, adev->rio_mem + (mmMM_DATA * 4));
        }
}

/**
 * amdgpu_mm_rdoorbell - read a doorbell dword
 *
 * @adev: amdgpu_device pointer
 * @index: doorbell index
 *
 * Returns the value in the doorbell aperture at the
 * requested doorbell index (CIK).
 */
u32 amdgpu_mm_rdoorbell(struct amdgpu_device *adev, u32 index)
{
        if (index < adev->doorbell.num_doorbells) {
                return readl(adev->doorbell.ptr + index);
        } else {
                DRM_ERROR("reading beyond doorbell aperture: 0x%08x!\n", index);
                return 0;
        }
}

/**
 * amdgpu_mm_wdoorbell - write a doorbell dword
 *
 * @adev: amdgpu_device pointer
 * @index: doorbell index
 * @v: value to write
 *
 * Writes @v to the doorbell aperture at the
 * requested doorbell index (CIK).
 */
void amdgpu_mm_wdoorbell(struct amdgpu_device *adev, u32 index, u32 v)
{
        if (index < adev->doorbell.num_doorbells) {
                writel(v, adev->doorbell.ptr + index);
        } else {
                DRM_ERROR("writing beyond doorbell aperture: 0x%08x!\n", index);
        }
}

/**
 * amdgpu_invalid_rreg - dummy reg read function
 *
 * @adev: amdgpu device pointer
 * @reg: offset of register
 *
 * Dummy register read function.  Used for register blocks
 * that certain asics don't have (all asics).
 * Returns the value in the register.
 */
static uint32_t amdgpu_invalid_rreg(struct amdgpu_device *adev, uint32_t reg)
{
        DRM_ERROR("Invalid callback to read register 0x%04X\n", reg);
        BUG();
        return 0;
}

/**
 * amdgpu_invalid_wreg - dummy reg write function
 *
 * @adev: amdgpu device pointer
 * @reg: offset of register
 * @v: value to write to the register
 *
 * Dummy register read function.  Used for register blocks
 * that certain asics don't have (all asics).
 */
static void amdgpu_invalid_wreg(struct amdgpu_device *adev, uint32_t reg, uint32_t v)
{
        DRM_ERROR("Invalid callback to write register 0x%04X with 0x%08X\n",
                  reg, v);
        BUG();
}

/**
 * amdgpu_block_invalid_rreg - dummy reg read function
 *
 * @adev: amdgpu device pointer
 * @block: offset of instance
 * @reg: offset of register
 *
 * Dummy register read function.  Used for register blocks
 * that certain asics don't have (all asics).
 * Returns the value in the register.
 */
static uint32_t amdgpu_block_invalid_rreg(struct amdgpu_device *adev,
                                          uint32_t block, uint32_t reg)
{
        DRM_ERROR("Invalid callback to read register 0x%04X in block 0x%04X\n",
                  reg, block);
        BUG();
        return 0;
}

/**
 * amdgpu_block_invalid_wreg - dummy reg write function
 *
 * @adev: amdgpu device pointer
 * @block: offset of instance
 * @reg: offset of register
 * @v: value to write to the register
 *
 * Dummy register read function.  Used for register blocks
 * that certain asics don't have (all asics).
 */
static void amdgpu_block_invalid_wreg(struct amdgpu_device *adev,
                                      uint32_t block,
                                      uint32_t reg, uint32_t v)
{
        DRM_ERROR("Invalid block callback to write register 0x%04X in block 0x%04X with 0x%08X\n",
                  reg, block, v);
        BUG();
}

static int amdgpu_vram_scratch_init(struct amdgpu_device *adev)
{
        int r;

        if (adev->vram_scratch.robj == NULL) {
                r = amdgpu_bo_create(adev, AMDGPU_GPU_PAGE_SIZE,
                                     PAGE_SIZE, true, AMDGPU_GEM_DOMAIN_VRAM,
                                     AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED,
                                     NULL, NULL, &adev->vram_scratch.robj);
                if (r) {
                        return r;
                }
        }

        r = amdgpu_bo_reserve(adev->vram_scratch.robj, false);
        if (unlikely(r != 0))
                return r;
        r = amdgpu_bo_pin(adev->vram_scratch.robj,
                          AMDGPU_GEM_DOMAIN_VRAM, &adev->vram_scratch.gpu_addr);
        if (r) {
                amdgpu_bo_unreserve(adev->vram_scratch.robj);
                return r;
        }
        r = amdgpu_bo_kmap(adev->vram_scratch.robj,
                                (void **)&adev->vram_scratch.ptr);
        if (r)
                amdgpu_bo_unpin(adev->vram_scratch.robj);
        amdgpu_bo_unreserve(adev->vram_scratch.robj);

        return r;
}

static void amdgpu_vram_scratch_fini(struct amdgpu_device *adev)
{
        int r;

        if (adev->vram_scratch.robj == NULL) {
                return;
        }
        r = amdgpu_bo_reserve(adev->vram_scratch.robj, false);
        if (likely(r == 0)) {
                amdgpu_bo_kunmap(adev->vram_scratch.robj);
                amdgpu_bo_unpin(adev->vram_scratch.robj);
                amdgpu_bo_unreserve(adev->vram_scratch.robj);
        }
        amdgpu_bo_unref(&adev->vram_scratch.robj);
}

/**
 * amdgpu_program_register_sequence - program an array of registers.
 *
 * @adev: amdgpu_device pointer
 * @registers: pointer to the register array
 * @array_size: size of the register array
 *
 * Programs an array or registers with and and or masks.
 * This is a helper for setting golden registers.
 */
void amdgpu_program_register_sequence(struct amdgpu_device *adev,
                                      const u32 *registers,
                                      const u32 array_size)
{
        u32 tmp, reg, and_mask, or_mask;
        int i;

        if (array_size % 3)
                return;

        for (i = 0; i < array_size; i +=3) {
                reg = registers[i + 0];
                and_mask = registers[i + 1];
                or_mask = registers[i + 2];

                if (and_mask == 0xffffffff) {
                        tmp = or_mask;
                } else {
                        tmp = RREG32(reg);
                        tmp &= ~and_mask;
                        tmp |= or_mask;
                }
                WREG32(reg, tmp);
        }
}

void amdgpu_pci_config_reset(struct amdgpu_device *adev)
{
        pci_write_config_dword(adev->pdev, 0x7c, AMDGPU_ASIC_RESET_DATA);
}

/*
 * GPU doorbell aperture helpers function.
 */
/**
 * amdgpu_doorbell_init - Init doorbell driver information.
 *
 * @adev: amdgpu_device pointer
 *
 * Init doorbell driver information (CIK)
 * Returns 0 on success, error on failure.
 */
static int amdgpu_doorbell_init(struct amdgpu_device *adev)
{
        /* doorbell bar mapping */
        adev->doorbell.base = pci_resource_start(adev->pdev, 2);
        adev->doorbell.size = pci_resource_len(adev->pdev, 2);

        adev->doorbell.num_doorbells = min_t(u32, adev->doorbell.size / sizeof(u32),
                                             AMDGPU_DOORBELL_MAX_ASSIGNMENT+1);
        if (adev->doorbell.num_doorbells == 0)
                return -EINVAL;

        adev->doorbell.ptr = ioremap(adev->doorbell.base, adev->doorbell.num_doorbells * sizeof(u32));
        if (adev->doorbell.ptr == NULL) {
                return -ENOMEM;
        }
        DRM_INFO("doorbell mmio base: 0x%08X\n", (uint32_t)adev->doorbell.base);
        DRM_INFO("doorbell mmio size: %u\n", (unsigned)adev->doorbell.size);

        return 0;
}

/**
 * amdgpu_doorbell_fini - Tear down doorbell driver information.
 *
 * @adev: amdgpu_device pointer
 *
 * Tear down doorbell driver information (CIK)
 */
static void amdgpu_doorbell_fini(struct amdgpu_device *adev)
{
        iounmap(adev->doorbell.ptr);
        adev->doorbell.ptr = NULL;
}

/**
 * amdgpu_doorbell_get_kfd_info - Report doorbell configuration required to
 *                                setup amdkfd
 *
 * @adev: amdgpu_device pointer
 * @aperture_base: output returning doorbell aperture base physical address
 * @aperture_size: output returning doorbell aperture size in bytes
 * @start_offset: output returning # of doorbell bytes reserved for amdgpu.
 *
 * amdgpu and amdkfd share the doorbell aperture. amdgpu sets it up,
 * takes doorbells required for its own rings and reports the setup to amdkfd.
 * amdgpu reserved doorbells are at the start of the doorbell aperture.
 */
void amdgpu_doorbell_get_kfd_info(struct amdgpu_device *adev,
                                phys_addr_t *aperture_base,
                                size_t *aperture_size,
                                size_t *start_offset)
{
        /*
         * The first num_doorbells are used by amdgpu.
         * amdkfd takes whatever's left in the aperture.
         */
        if (adev->doorbell.size > adev->doorbell.num_doorbells * sizeof(u32)) {
                *aperture_base = adev->doorbell.base;
                *aperture_size = adev->doorbell.size;
                *start_offset = adev->doorbell.num_doorbells * sizeof(u32);
        } else {
                *aperture_base = 0;
                *aperture_size = 0;
                *start_offset = 0;
        }
}

/*
 * amdgpu_wb_*()
 * Writeback is the the method by which the the GPU updates special pages
 * in memory with the status of certain GPU events (fences, ring pointers,
 * etc.).
 */

/**
 * amdgpu_wb_fini - Disable Writeback and free memory
 *
 * @adev: amdgpu_device pointer
 *
 * Disables Writeback and frees the Writeback memory (all asics).
 * Used at driver shutdown.
 */
static void amdgpu_wb_fini(struct amdgpu_device *adev)
{
        if (adev->wb.wb_obj) {
                if (!amdgpu_bo_reserve(adev->wb.wb_obj, false)) {
                        amdgpu_bo_kunmap(adev->wb.wb_obj);
                        amdgpu_bo_unpin(adev->wb.wb_obj);
                        amdgpu_bo_unreserve(adev->wb.wb_obj);
                }
                amdgpu_bo_unref(&adev->wb.wb_obj);
                adev->wb.wb = NULL;
                adev->wb.wb_obj = NULL;
        }
}

/**
 * amdgpu_wb_init- Init Writeback driver info and allocate memory
 *
 * @adev: amdgpu_device pointer
 *
 * Disables Writeback and frees the Writeback memory (all asics).
 * Used at driver startup.
 * Returns 0 on success or an -error on failure.
 */
static int amdgpu_wb_init(struct amdgpu_device *adev)
{
        int r;

        if (adev->wb.wb_obj == NULL) {
                r = amdgpu_bo_create(adev, AMDGPU_MAX_WB * 4, PAGE_SIZE, true,
                                     AMDGPU_GEM_DOMAIN_GTT, 0,  NULL, NULL,
                                     &adev->wb.wb_obj);
                if (r) {
                        dev_warn(adev->dev, "(%d) create WB bo failed\n", r);
                        return r;
                }
                r = amdgpu_bo_reserve(adev->wb.wb_obj, false);
                if (unlikely(r != 0)) {
                        amdgpu_wb_fini(adev);
                        return r;
                }
                r = amdgpu_bo_pin(adev->wb.wb_obj, AMDGPU_GEM_DOMAIN_GTT,
                                &adev->wb.gpu_addr);
                if (r) {
                        amdgpu_bo_unreserve(adev->wb.wb_obj);
                        dev_warn(adev->dev, "(%d) pin WB bo failed\n", r);
                        amdgpu_wb_fini(adev);
                        return r;
                }
                r = amdgpu_bo_kmap(adev->wb.wb_obj, (void **)&adev->wb.wb);
                amdgpu_bo_unreserve(adev->wb.wb_obj);
                if (r) {
                        dev_warn(adev->dev, "(%d) map WB bo failed\n", r);
                        amdgpu_wb_fini(adev);
                        return r;
                }

                adev->wb.num_wb = AMDGPU_MAX_WB;
                memset(&adev->wb.used, 0, sizeof(adev->wb.used));

                /* clear wb memory */
                memset((char *)adev->wb.wb, 0, AMDGPU_GPU_PAGE_SIZE);
        }

        return 0;
}

/**
 * amdgpu_wb_get - Allocate a wb entry
 *
 * @adev: amdgpu_device pointer
 * @wb: wb index
 *
 * Allocate a wb slot for use by the driver (all asics).
 * Returns 0 on success or -EINVAL on failure.
 */
int amdgpu_wb_get(struct amdgpu_device *adev, u32 *wb)
{
        unsigned long offset = find_first_zero_bit(adev->wb.used, adev->wb.num_wb);
        if (offset < adev->wb.num_wb) {
                __set_bit(offset, adev->wb.used);
                *wb = offset;
                return 0;
        } else {
                return -EINVAL;
        }
}

/**
 * amdgpu_wb_free - Free a wb entry
 *
 * @adev: amdgpu_device pointer
 * @wb: wb index
 *
 * Free a wb slot allocated for use by the driver (all asics)
 */
void amdgpu_wb_free(struct amdgpu_device *adev, u32 wb)
{
        if (wb < adev->wb.num_wb)
                __clear_bit(wb, adev->wb.used);
}

/**
 * amdgpu_vram_location - try to find VRAM location
 * @adev: amdgpu device structure holding all necessary informations
 * @mc: memory controller structure holding memory informations
 * @base: base address at which to put VRAM
 *
 * Function will place try to place VRAM at base address provided
 * as parameter (which is so far either PCI aperture address or
 * for IGP TOM base address).
 *
 * If there is not enough space to fit the unvisible VRAM in the 32bits
 * address space then we limit the VRAM size to the aperture.
 *
 * Note: We don't explicitly enforce VRAM start to be aligned on VRAM size,
 * this shouldn't be a problem as we are using the PCI aperture as a reference.
 * Otherwise this would be needed for rv280, all r3xx, and all r4xx, but
 * not IGP.
 *
 * Note: we use mc_vram_size as on some board we need to program the mc to
 * cover the whole aperture even if VRAM size is inferior to aperture size
 * Novell bug 204882 + along with lots of ubuntu ones
 *
 * Note: when limiting vram it's safe to overwritte real_vram_size because
 * we are not in case where real_vram_size is inferior to mc_vram_size (ie
 * note afected by bogus hw of Novell bug 204882 + along with lots of ubuntu
 * ones)
 *
 * Note: IGP TOM addr should be the same as the aperture addr, we don't
 * explicitly check for that thought.
 *
 * FIXME: when reducing VRAM size align new size on power of 2.
 */
void amdgpu_vram_location(struct amdgpu_device *adev, struct amdgpu_mc *mc, u64 base)
{
        uint64_t limit = (uint64_t)amdgpu_vram_limit << 20;

        mc->vram_start = base;
        if (mc->mc_vram_size > (adev->mc.mc_mask - base + 1)) {
                dev_warn(adev->dev, "limiting VRAM to PCI aperture size\n");
                mc->real_vram_size = mc->aper_size;
                mc->mc_vram_size = mc->aper_size;
        }
        mc->vram_end = mc->vram_start + mc->mc_vram_size - 1;
        if (limit && limit < mc->real_vram_size)
                mc->real_vram_size = limit;
        dev_info(adev->dev, "VRAM: %lluM 0x%016llX - 0x%016llX (%lluM used)\n",
                        mc->mc_vram_size >> 20, mc->vram_start,
                        mc->vram_end, mc->real_vram_size >> 20);
}

/**
 * amdgpu_gtt_location - try to find GTT location
 * @adev: amdgpu device structure holding all necessary informations
 * @mc: memory controller structure holding memory informations
 *
 * Function will place try to place GTT before or after VRAM.
 *
 * If GTT size is bigger than space left then we ajust GTT size.
 * Thus function will never fails.
 *
 * FIXME: when reducing GTT size align new size on power of 2.
 */
void amdgpu_gtt_location(struct amdgpu_device *adev, struct amdgpu_mc *mc)
{
        u64 size_af, size_bf;

        size_af = ((adev->mc.mc_mask - mc->vram_end) + mc->gtt_base_align) & ~mc->gtt_base_align;
        size_bf = mc->vram_start & ~mc->gtt_base_align;
        if (size_bf > size_af) {
                if (mc->gtt_size > size_bf) {
                        dev_warn(adev->dev, "limiting GTT\n");
                        mc->gtt_size = size_bf;
                }
                mc->gtt_start = (mc->vram_start & ~mc->gtt_base_align) - mc->gtt_size;
        } else {
                if (mc->gtt_size > size_af) {
                        dev_warn(adev->dev, "limiting GTT\n");
                        mc->gtt_size = size_af;
                }
                mc->gtt_start = (mc->vram_end + 1 + mc->gtt_base_align) & ~mc->gtt_base_align;
        }
        mc->gtt_end = mc->gtt_start + mc->gtt_size - 1;
        dev_info(adev->dev, "GTT: %lluM 0x%016llX - 0x%016llX\n",
                        mc->gtt_size >> 20, mc->gtt_start, mc->gtt_end);
}

/*
 * GPU helpers function.
 */
/**
 * amdgpu_card_posted - check if the hw has already been initialized
 *
 * @adev: amdgpu_device pointer
 *
 * Check if the asic has been initialized (all asics).
 * Used at driver startup.
 * Returns true if initialized or false if not.
 */
bool amdgpu_card_posted(struct amdgpu_device *adev)
{
        uint32_t reg;

        /* then check MEM_SIZE, in case the crtcs are off */
        reg = RREG32(mmCONFIG_MEMSIZE);

        if (reg)
                return true;

        return false;

}

static bool amdgpu_vpost_needed(struct amdgpu_device *adev)
{
        if (amdgpu_sriov_vf(adev))
                return false;

        if (amdgpu_passthrough(adev)) {
                /* for FIJI: In whole GPU pass-through virtualization case
                 * old smc fw won't clear some registers (e.g. MEM_SIZE, BIOS_SCRATCH)
                 * so amdgpu_card_posted return false and driver will incorrectly skip vPost.
                 * but if we force vPost do in pass-through case, the driver reload will hang.
                 * whether doing vPost depends on amdgpu_card_posted if smc version is above
                 * 00160e00 for FIJI.
                 */
                if (adev->asic_type == CHIP_FIJI) {
                        int err;
                        uint32_t fw_ver;
                        err = request_firmware(&adev->pm.fw, "amdgpu/fiji_smc.bin", adev->dev);
                        /* force vPost if error occured */
                        if (err)
                                return true;

                        fw_ver = *((uint32_t *)adev->pm.fw->data + 69);
                        if (fw_ver >= 0x00160e00)
                                return !amdgpu_card_posted(adev);
                }
        } else {
                /* in bare-metal case, amdgpu_card_posted return false
                 * after system reboot/boot, and return true if driver
                 * reloaded.
                 * we shouldn't do vPost after driver reload otherwise GPU
                 * could hang.
                 */
                if (amdgpu_card_posted(adev))
                        return false;
        }

        /* we assume vPost is neede for all other cases */
        return true;
}

/**
 * amdgpu_dummy_page_init - init dummy page used by the driver
 *
 * @adev: amdgpu_device pointer
 *
 * Allocate the dummy page used by the driver (all asics).
 * This dummy page is used by the driver as a filler for gart entries
 * when pages are taken out of the GART
 * Returns 0 on sucess, -ENOMEM on failure.
 */
int amdgpu_dummy_page_init(struct amdgpu_device *adev)
{
        if (adev->dummy_page.page)
                return 0;
        adev->dummy_page.page = alloc_page(GFP_DMA32 | GFP_KERNEL | __GFP_ZERO);
        if (adev->dummy_page.page == NULL)
                return -ENOMEM;
        adev->dummy_page.addr = pci_map_page(adev->pdev, adev->dummy_page.page,
                                        0, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
        if (pci_dma_mapping_error(adev->pdev, adev->dummy_page.addr)) {
                dev_err(&adev->pdev->dev, "Failed to DMA MAP the dummy page\n");
                __free_page(adev->dummy_page.page);
                adev->dummy_page.page = NULL;
                return -ENOMEM;
        }
        return 0;
}

/**
 * amdgpu_dummy_page_fini - free dummy page used by the driver
 *
 * @adev: amdgpu_device pointer
 *
 * Frees the dummy page used by the driver (all asics).
 */
void amdgpu_dummy_page_fini(struct amdgpu_device *adev)
{
        if (adev->dummy_page.page == NULL)
                return;
        pci_unmap_page(adev->pdev, adev->dummy_page.addr,
                        PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
        __free_page(adev->dummy_page.page);
        adev->dummy_page.page = NULL;
}


/* ATOM accessor methods */
/*
 * ATOM is an interpreted byte code stored in tables in the vbios.  The
 * driver registers callbacks to access registers and the interpreter
 * in the driver parses the tables and executes then to program specific
 * actions (set display modes, asic init, etc.).  See amdgpu_atombios.c,
 * atombios.h, and atom.c
 */

/**
 * cail_pll_read - read PLL register
 *
 * @info: atom card_info pointer
 * @reg: PLL register offset
 *
 * Provides a PLL register accessor for the atom interpreter (r4xx+).
 * Returns the value of the PLL register.
 */
static uint32_t cail_pll_read(struct card_info *info, uint32_t reg)
{
        return 0;
}

/**
 * cail_pll_write - write PLL register
 *
 * @info: atom card_info pointer
 * @reg: PLL register offset
 * @val: value to write to the pll register
 *
 * Provides a PLL register accessor for the atom interpreter (r4xx+).
 */
static void cail_pll_write(struct card_info *info, uint32_t reg, uint32_t val)
{

}

/**
 * cail_mc_read - read MC (Memory Controller) register
 *
 * @info: atom card_info pointer
 * @reg: MC register offset
 *
 * Provides an MC register accessor for the atom interpreter (r4xx+).
 * Returns the value of the MC register.
 */
static uint32_t cail_mc_read(struct card_info *info, uint32_t reg)
{
        return 0;
}

/**
 * cail_mc_write - write MC (Memory Controller) register
 *
 * @info: atom card_info pointer
 * @reg: MC register offset
 * @val: value to write to the pll register
 *
 * Provides a MC register accessor for the atom interpreter (r4xx+).
 */
static void cail_mc_write(struct card_info *info, uint32_t reg, uint32_t val)
{

}

/**
 * cail_reg_write - write MMIO register
 *
 * @info: atom card_info pointer
 * @reg: MMIO register offset
 * @val: value to write to the pll register
 *
 * Provides a MMIO register accessor for the atom interpreter (r4xx+).
 */
static void cail_reg_write(struct card_info *info, uint32_t reg, uint32_t val)
{
        struct amdgpu_device *adev = info->dev->dev_private;

        WREG32(reg, val);
}

/**
 * cail_reg_read - read MMIO register
 *
 * @info: atom card_info pointer
 * @reg: MMIO register offset
 *
 * Provides an MMIO register accessor for the atom interpreter (r4xx+).
 * Returns the value of the MMIO register.
 */
static uint32_t cail_reg_read(struct card_info *info, uint32_t reg)
{
        struct amdgpu_device *adev = info->dev->dev_private;
        uint32_t r;

        r = RREG32(reg);
        return r;
}

/**
 * cail_ioreg_write - write IO register
 *
 * @info: atom card_info pointer
 * @reg: IO register offset
 * @val: value to write to the pll register
 *
 * Provides a IO register accessor for the atom interpreter (r4xx+).
 */
static void cail_ioreg_write(struct card_info *info, uint32_t reg, uint32_t val)
{
        struct amdgpu_device *adev = info->dev->dev_private;

        WREG32_IO(reg, val);
}

/**
 * cail_ioreg_read - read IO register
 *
 * @info: atom card_info pointer
 * @reg: IO register offset
 *
 * Provides an IO register accessor for the atom interpreter (r4xx+).
 * Returns the value of the IO register.
 */
static uint32_t cail_ioreg_read(struct card_info *info, uint32_t reg)
{
        struct amdgpu_device *adev = info->dev->dev_private;
        uint32_t r;

        r = RREG32_IO(reg);
        return r;
}

/**
 * amdgpu_atombios_fini - free the driver info and callbacks for atombios
 *
 * @adev: amdgpu_device pointer
 *
 * Frees the driver info and register access callbacks for the ATOM
 * interpreter (r4xx+).
 * Called at driver shutdown.
 */
static void amdgpu_atombios_fini(struct amdgpu_device *adev)
{
        if (adev->mode_info.atom_context) {
                kfree(adev->mode_info.atom_context->scratch);
                kfree(adev->mode_info.atom_context->iio);
        }
        kfree(adev->mode_info.atom_context);
        adev->mode_info.atom_context = NULL;
        kfree(adev->mode_info.atom_card_info);
        adev->mode_info.atom_card_info = NULL;
}

/**
 * amdgpu_atombios_init - init the driver info and callbacks for atombios
 *
 * @adev: amdgpu_device pointer
 *
 * Initializes the driver info and register access callbacks for the
 * ATOM interpreter (r4xx+).
 * Returns 0 on sucess, -ENOMEM on failure.
 * Called at driver startup.
 */
static int amdgpu_atombios_init(struct amdgpu_device *adev)
{
        struct card_info *atom_card_info =
            kzalloc(sizeof(struct card_info), GFP_KERNEL);

        if (!atom_card_info)
                return -ENOMEM;

        adev->mode_info.atom_card_info = atom_card_info;
        atom_card_info->dev = adev->ddev;
        atom_card_info->reg_read = cail_reg_read;
        atom_card_info->reg_write = cail_reg_write;
        /* needed for iio ops */
        if (adev->rio_mem) {
                atom_card_info->ioreg_read = cail_ioreg_read;
                atom_card_info->ioreg_write = cail_ioreg_write;
        } else {
                DRM_ERROR("Unable to find PCI I/O BAR; using MMIO for ATOM IIO\n");
                atom_card_info->ioreg_read = cail_reg_read;
                atom_card_info->ioreg_write = cail_reg_write;
        }
        atom_card_info->mc_read = cail_mc_read;
        atom_card_info->mc_write = cail_mc_write;
        atom_card_info->pll_read = cail_pll_read;
        atom_card_info->pll_write = cail_pll_write;

        adev->mode_info.atom_context = amdgpu_atom_parse(atom_card_info, adev->bios);
        if (!adev->mode_info.atom_context) {
                amdgpu_atombios_fini(adev);
                return -ENOMEM;
        }

        mutex_init(&adev->mode_info.atom_context->mutex);
        amdgpu_atombios_scratch_regs_init(adev);
        amdgpu_atom_allocate_fb_scratch(adev->mode_info.atom_context);
        return 0;
}

/* if we get transitioned to only one device, take VGA back */
/**
 * amdgpu_vga_set_decode - enable/disable vga decode
 *
 * @cookie: amdgpu_device pointer
 * @state: enable/disable vga decode
 *
 * Enable/disable vga decode (all asics).
 * Returns VGA resource flags.
 */
static unsigned int amdgpu_vga_set_decode(void *cookie, bool state)
{
        struct amdgpu_device *adev = cookie;
        amdgpu_asic_set_vga_state(adev, 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;
}

/**
 * amdgpu_check_pot_argument - check that argument is a power of two
 *
 * @arg: value to check
 *
 * Validates that a certain argument is a power of two (all asics).
 * Returns true if argument is valid.
 */
static bool amdgpu_check_pot_argument(int arg)
{
        return (arg & (arg - 1)) == 0;
}

/**
 * amdgpu_check_arguments - validate module params
 *
 * @adev: amdgpu_device pointer
 *
 * Validates certain module parameters and updates
 * the associated values used by the driver (all asics).
 */
static void amdgpu_check_arguments(struct amdgpu_device *adev)
{
        if (amdgpu_sched_jobs < 4) {
                dev_warn(adev->dev, "sched jobs (%d) must be at least 4\n",
                         amdgpu_sched_jobs);
                amdgpu_sched_jobs = 4;
        } else if (!amdgpu_check_pot_argument(amdgpu_sched_jobs)){
                dev_warn(adev->dev, "sched jobs (%d) must be a power of 2\n",
                         amdgpu_sched_jobs);
                amdgpu_sched_jobs = roundup_pow_of_two(amdgpu_sched_jobs);
        }

        if (amdgpu_gart_size != -1) {
                /* gtt size must be greater or equal to 32M */
                if (amdgpu_gart_size < 32) {
                        dev_warn(adev->dev, "gart size (%d) too small\n",
                                 amdgpu_gart_size);
                        amdgpu_gart_size = -1;
                }
        }

        if (!amdgpu_check_pot_argument(amdgpu_vm_size)) {
                dev_warn(adev->dev, "VM size (%d) must be a power of 2\n",
                         amdgpu_vm_size);
                amdgpu_vm_size = 8;
        }

        if (amdgpu_vm_size < 1) {
                dev_warn(adev->dev, "VM size (%d) too small, min is 1GB\n",
                         amdgpu_vm_size);
                amdgpu_vm_size = 8;
        }

        /*
         * Max GPUVM size for Cayman, SI and CI are 40 bits.
         */
        if (amdgpu_vm_size > 1024) {
                dev_warn(adev->dev, "VM size (%d) too large, max is 1TB\n",
                         amdgpu_vm_size);
                amdgpu_vm_size = 8;
        }

        /* defines number of bits in page table versus page directory,
         * a page is 4KB so we have 12 bits offset, minimum 9 bits in the
         * page table and the remaining bits are in the page directory */
        if (amdgpu_vm_block_size == -1) {

                /* Total bits covered by PD + PTs */
                unsigned bits = ilog2(amdgpu_vm_size) + 18;

                /* Make sure the PD is 4K in size up to 8GB address space.
                   Above that split equal between PD and PTs */
                if (amdgpu_vm_size <= 8)
                        amdgpu_vm_block_size = bits - 9;
                else
                        amdgpu_vm_block_size = (bits + 3) / 2;

        } else if (amdgpu_vm_block_size < 9) {
                dev_warn(adev->dev, "VM page table size (%d) too small\n",
                         amdgpu_vm_block_size);
                amdgpu_vm_block_size = 9;
        }

        if (amdgpu_vm_block_size > 24 ||
            (amdgpu_vm_size * 1024) < (1ull << amdgpu_vm_block_size)) {
                dev_warn(adev->dev, "VM page table size (%d) too large\n",
                         amdgpu_vm_block_size);
                amdgpu_vm_block_size = 9;
        }
}

/**
 * amdgpu_switcheroo_set_state - set switcheroo state
 *
 * @pdev: pci dev pointer
 * @state: vga_switcheroo state
 *
 * Callback for the switcheroo driver.  Suspends or resumes the
 * the asics before or after it is powered up using ACPI methods.
 */
static void amdgpu_switcheroo_set_state(struct pci_dev *pdev, enum vga_switcheroo_state state)
{
        struct drm_device *dev = pci_get_drvdata(pdev);

        if (amdgpu_device_is_px(dev) && state == VGA_SWITCHEROO_OFF)
                return;

        if (state == VGA_SWITCHEROO_ON) {
                unsigned d3_delay = dev->pdev->d3_delay;

                printk(KERN_INFO "amdgpu: switched on\n");
                /* don't suspend or resume card normally */
                dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;

                amdgpu_device_resume(dev, true, true);

                dev->pdev->d3_delay = d3_delay;

                dev->switch_power_state = DRM_SWITCH_POWER_ON;
                drm_kms_helper_poll_enable(dev);
        } else {
                printk(KERN_INFO "amdgpu: switched off\n");
                drm_kms_helper_poll_disable(dev);
                dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
                amdgpu_device_suspend(dev, true, true);
                dev->switch_power_state = DRM_SWITCH_POWER_OFF;
        }
}

/**
 * amdgpu_switcheroo_can_switch - see if switcheroo state can change
 *
 * @pdev: pci dev pointer
 *
 * Callback for the switcheroo driver.  Check of the switcheroo
 * state can be changed.
 * Returns true if the state can be changed, false if not.
 */
static bool amdgpu_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 amdgpu_switcheroo_ops = {
        .set_gpu_state = amdgpu_switcheroo_set_state,
        .reprobe = NULL,
        .can_switch = amdgpu_switcheroo_can_switch,
};

int amdgpu_set_clockgating_state(struct amdgpu_device *adev,
                                  enum amd_ip_block_type block_type,
                                  enum amd_clockgating_state state)
{
        int i, r = 0;

        for (i = 0; i < adev->num_ip_blocks; i++) {
                if (!adev->ip_block_status[i].valid)
                        continue;
                if (adev->ip_blocks[i].type == block_type) {
                        r = adev->ip_blocks[i].funcs->set_clockgating_state((void *)adev,
                                                                            state);
                        if (r)
                                return r;
                        break;
                }
        }
        return r;
}

int amdgpu_set_powergating_state(struct amdgpu_device *adev,
                                  enum amd_ip_block_type block_type,
                                  enum amd_powergating_state state)
{
        int i, r = 0;

        for (i = 0; i < adev->num_ip_blocks; i++) {
                if (!adev->ip_block_status[i].valid)
                        continue;
                if (adev->ip_blocks[i].type == block_type) {
                        r = adev->ip_blocks[i].funcs->set_powergating_state((void *)adev,
                                                                            state);
                        if (r)
                                return r;
                        break;
                }
        }
        return r;
}

int amdgpu_wait_for_idle(struct amdgpu_device *adev,
                         enum amd_ip_block_type block_type)
{
        int i, r;

        for (i = 0; i < adev->num_ip_blocks; i++) {
                if (!adev->ip_block_status[i].valid)
                        continue;
                if (adev->ip_blocks[i].type == block_type) {
                        r = adev->ip_blocks[i].funcs->wait_for_idle((void *)adev);
                        if (r)
                                return r;
                        break;
                }
        }
        return 0;

}

bool amdgpu_is_idle(struct amdgpu_device *adev,
                    enum amd_ip_block_type block_type)
{
        int i;

        for (i = 0; i < adev->num_ip_blocks; i++) {
                if (!adev->ip_block_status[i].valid)
                        continue;
                if (adev->ip_blocks[i].type == block_type)
                        return adev->ip_blocks[i].funcs->is_idle((void *)adev);
        }
        return true;

}

const struct amdgpu_ip_block_version * amdgpu_get_ip_block(
                                        struct amdgpu_device *adev,
                                        enum amd_ip_block_type type)
{
        int i;

        for (i = 0; i < adev->num_ip_blocks; i++)
                if (adev->ip_blocks[i].type == type)
                        return &adev->ip_blocks[i];

        return NULL;
}

/**
 * amdgpu_ip_block_version_cmp
 *
 * @adev: amdgpu_device pointer
 * @type: enum amd_ip_block_type
 * @major: major version
 * @minor: minor version
 *
 * return 0 if equal or greater
 * return 1 if smaller or the ip_block doesn't exist
 */
int amdgpu_ip_block_version_cmp(struct amdgpu_device *adev,
                                enum amd_ip_block_type type,
                                u32 major, u32 minor)
{
        const struct amdgpu_ip_block_version *ip_block;
        ip_block = amdgpu_get_ip_block(adev, type);

        if (ip_block && ((ip_block->major > major) ||
                        ((ip_block->major == major) &&
                        (ip_block->minor >= minor))))
                return 0;

        return 1;
}

static void amdgpu_whether_enable_virtual_display(struct amdgpu_device *adev)
{
        adev->enable_virtual_display = false;

        if (amdgpu_virtual_display) {
                struct drm_device *ddev = adev->ddev;
                const char *pci_address_name = pci_name(ddev->pdev);
                char *pciaddstr, *pciaddstr_tmp, *pciaddname;

                pciaddstr = kstrdup(amdgpu_virtual_display, GFP_KERNEL);
                pciaddstr_tmp = pciaddstr;
                while ((pciaddname = strsep(&pciaddstr_tmp, ";"))) {
                        if (!strcmp(pci_address_name, pciaddname)) {
                                adev->enable_virtual_display = true;
                                break;
                        }
                }

                DRM_INFO("virtual display string:%s, %s:virtual_display:%d\n",
                                 amdgpu_virtual_display, pci_address_name,
                                 adev->enable_virtual_display);

                kfree(pciaddstr);
        }
}

static int amdgpu_early_init(struct amdgpu_device *adev)
{
        int i, r;

        amdgpu_whether_enable_virtual_display(adev);

        switch (adev->asic_type) {
        case CHIP_TOPAZ:
        case CHIP_TONGA:
        case CHIP_FIJI:
        case CHIP_POLARIS11:
        case CHIP_POLARIS10:
        case CHIP_CARRIZO:
        case CHIP_STONEY:
                if (adev->asic_type == CHIP_CARRIZO || adev->asic_type == CHIP_STONEY)
                        adev->family = AMDGPU_FAMILY_CZ;
                else
                        adev->family = AMDGPU_FAMILY_VI;

                r = vi_set_ip_blocks(adev);
                if (r)
                        return r;
                break;
#ifdef CONFIG_DRM_AMDGPU_SI
        case CHIP_VERDE:
        case CHIP_TAHITI:
        case CHIP_PITCAIRN:
        case CHIP_OLAND:
        case CHIP_HAINAN:
                adev->family = AMDGPU_FAMILY_SI;
                r = si_set_ip_blocks(adev);
                if (r)
                        return r;
                break;
#endif
#ifdef CONFIG_DRM_AMDGPU_CIK
        case CHIP_BONAIRE:
        case CHIP_HAWAII:
        case CHIP_KAVERI:
        case CHIP_KABINI:
        case CHIP_MULLINS:
                if ((adev->asic_type == CHIP_BONAIRE) || (adev->asic_type == CHIP_HAWAII))
                        adev->family = AMDGPU_FAMILY_CI;
                else
                        adev->family = AMDGPU_FAMILY_KV;

                r = cik_set_ip_blocks(adev);
                if (r)
                        return r;
                break;
#endif
        default:
                /* FIXME: not supported yet */
                return -EINVAL;
        }

        adev->ip_block_status = kcalloc(adev->num_ip_blocks,
                                        sizeof(struct amdgpu_ip_block_status), GFP_KERNEL);
        if (adev->ip_block_status == NULL)
                return -ENOMEM;

        if (adev->ip_blocks == NULL) {
                DRM_ERROR("No IP blocks found!\n");
                return r;
        }

        for (i = 0; i < adev->num_ip_blocks; i++) {
                if ((amdgpu_ip_block_mask & (1 << i)) == 0) {
                        DRM_ERROR("disabled ip block: %d\n", i);
                        adev->ip_block_status[i].valid = false;
                } else {
                        if (adev->ip_blocks[i].funcs->early_init) {
                                r = adev->ip_blocks[i].funcs->early_init((void *)adev);
                                if (r == -ENOENT) {
                                        adev->ip_block_status[i].valid = false;
                                } else if (r) {
                                        DRM_ERROR("early_init of IP block <%s> failed %d\n", adev->ip_blocks[i].funcs->name, r);
                                        return r;
                                } else {
                                        adev->ip_block_status[i].valid = true;
                                }
                        } else {
                                adev->ip_block_status[i].valid = true;
                        }
                }
        }

        adev->cg_flags &= amdgpu_cg_mask;
        adev->pg_flags &= amdgpu_pg_mask;

        return 0;
}

static int amdgpu_init(struct amdgpu_device *adev)
{
        int i, r;

        for (i = 0; i < adev->num_ip_blocks; i++) {
                if (!adev->ip_block_status[i].valid)
                        continue;
                r = adev->ip_blocks[i].funcs->sw_init((void *)adev);
                if (r) {
                        DRM_ERROR("sw_init of IP block <%s> failed %d\n", adev->ip_blocks[i].funcs->name, r);
                        return r;
                }
                adev->ip_block_status[i].sw = true;
                /* need to do gmc hw init early so we can allocate gpu mem */
                if (adev->ip_blocks[i].type == AMD_IP_BLOCK_TYPE_GMC) {
                        r = amdgpu_vram_scratch_init(adev);
                        if (r) {
                                DRM_ERROR("amdgpu_vram_scratch_init failed %d\n", r);
                                return r;
                        }
                        r = adev->ip_blocks[i].funcs->hw_init((void *)adev);
                        if (r) {
                                DRM_ERROR("hw_init %d failed %d\n", i, r);
                                return r;
                        }
                        r = amdgpu_wb_init(adev);
                        if (r) {
                                DRM_ERROR("amdgpu_wb_init failed %d\n", r);
                                return r;
                        }
                        adev->ip_block_status[i].hw = true;
                }
        }

        for (i = 0; i < adev->num_ip_blocks; i++) {
                if (!adev->ip_block_status[i].sw)
                        continue;
                /* gmc hw init is done early */
                if (adev->ip_blocks[i].type == AMD_IP_BLOCK_TYPE_GMC)
                        continue;
                r = adev->ip_blocks[i].funcs->hw_init((void *)adev);
                if (r) {
                        DRM_ERROR("hw_init of IP block <%s> failed %d\n", adev->ip_blocks[i].funcs->name, r);
                        return r;
                }
                adev->ip_block_status[i].hw = true;
        }

        return 0;
}

static int amdgpu_late_init(struct amdgpu_device *adev)
{
        int i = 0, r;

        for (i = 0; i < adev->num_ip_blocks; i++) {
                if (!adev->ip_block_status[i].valid)
                        continue;
                if (adev->ip_blocks[i].funcs->late_init) {
                        r = adev->ip_blocks[i].funcs->late_init((void *)adev);
                        if (r) {
                                DRM_ERROR("late_init of IP block <%s> failed %d\n", adev->ip_blocks[i].funcs->name, r);
                                return r;
                        }
                        adev->ip_block_status[i].late_initialized = true;
                }
                /* skip CG for VCE/UVD, it's handled specially */
                if (adev->ip_blocks[i].type != AMD_IP_BLOCK_TYPE_UVD &&
                    adev->ip_blocks[i].type != AMD_IP_BLOCK_TYPE_VCE) {
                        /* enable clockgating to save power */
                        r = adev->ip_blocks[i].funcs->set_clockgating_state((void *)adev,
                                                                            AMD_CG_STATE_GATE);
                        if (r) {
                                DRM_ERROR("set_clockgating_state(gate) of IP block <%s> failed %d\n",
                                          adev->ip_blocks[i].funcs->name, r);
                                return r;
                        }
                }
        }

        return 0;
}

static int amdgpu_fini(struct amdgpu_device *adev)
{
        int i, r;

        for (i = adev->num_ip_blocks - 1; i >= 0; i--) {
                if (!adev->ip_block_status[i].hw)
                        continue;
                if (adev->ip_blocks[i].type == AMD_IP_BLOCK_TYPE_GMC) {
                        amdgpu_wb_fini(adev);
                        amdgpu_vram_scratch_fini(adev);
                }
                /* ungate blocks before hw fini so that we can shutdown the blocks safely */
                r = adev->ip_blocks[i].funcs->set_clockgating_state((void *)adev,
                                                                    AMD_CG_STATE_UNGATE);
                if (r) {
                        DRM_ERROR("set_clockgating_state(ungate) of IP block <%s> failed %d\n", adev->ip_blocks[i].funcs->name, r);
                        return r;
                }
                r = adev->ip_blocks[i].funcs->hw_fini((void *)adev);
                /* XXX handle errors */
                if (r) {
                        DRM_DEBUG("hw_fini of IP block <%s> failed %d\n", adev->ip_blocks[i].funcs->name, r);
                }
                adev->ip_block_status[i].hw = false;
        }

        for (i = adev->num_ip_blocks - 1; i >= 0; i--) {
                if (!adev->ip_block_status[i].sw)
                        continue;
                r = adev->ip_blocks[i].funcs->sw_fini((void *)adev);
                /* XXX handle errors */
                if (r) {
                        DRM_DEBUG("sw_fini of IP block <%s> failed %d\n", adev->ip_blocks[i].funcs->name, r);
                }
                adev->ip_block_status[i].sw = false;
                adev->ip_block_status[i].valid = false;
        }

        for (i = adev->num_ip_blocks - 1; i >= 0; i--) {
                if (!adev->ip_block_status[i].late_initialized)
                        continue;
                if (adev->ip_blocks[i].funcs->late_fini)
                        adev->ip_blocks[i].funcs->late_fini((void *)adev);
                adev->ip_block_status[i].late_initialized = false;
        }

        return 0;
}

static int amdgpu_suspend(struct amdgpu_device *adev)
{
        int i, r;

        /* ungate SMC block first */
        r = amdgpu_set_clockgating_state(adev, AMD_IP_BLOCK_TYPE_SMC,
                                         AMD_CG_STATE_UNGATE);
        if (r) {
                DRM_ERROR("set_clockgating_state(ungate) SMC failed %d\n",r);
        }

        for (i = adev->num_ip_blocks - 1; i >= 0; i--) {
                if (!adev->ip_block_status[i].valid)
                        continue;
                /* ungate blocks so that suspend can properly shut them down */
                if (i != AMD_IP_BLOCK_TYPE_SMC) {
                        r = adev->ip_blocks[i].funcs->set_clockgating_state((void *)adev,
                                                                            AMD_CG_STATE_UNGATE);
                        if (r) {
                                DRM_ERROR("set_clockgating_state(ungate) of IP block <%s> failed %d\n", adev->ip_blocks[i].funcs->name, r);
                        }
                }
                /* XXX handle errors */
                r = adev->ip_blocks[i].funcs->suspend(adev);
                /* XXX handle errors */
                if (r) {
                        DRM_ERROR("suspend of IP block <%s> failed %d\n", adev->ip_blocks[i].funcs->name, r);
                }
        }

        return 0;
}

static int amdgpu_resume(struct amdgpu_device *adev)
{
        int i, r;

        for (i = 0; i < adev->num_ip_blocks; i++) {
                if (!adev->ip_block_status[i].valid)
                        continue;
                r = adev->ip_blocks[i].funcs->resume(adev);
                if (r) {
                        DRM_ERROR("resume of IP block <%s> failed %d\n", adev->ip_blocks[i].funcs->name, r);
                        return r;
                }
        }

        return 0;
}

static void amdgpu_device_detect_sriov_bios(struct amdgpu_device *adev)
{
        if (amdgpu_atombios_has_gpu_virtualization_table(adev))
                adev->virtualization.virtual_caps |= AMDGPU_SRIOV_CAPS_SRIOV_VBIOS;
}

/**
 * amdgpu_device_init - initialize the driver
 *
 * @adev: amdgpu_device pointer
 * @pdev: drm dev pointer
 * @pdev: pci dev pointer
 * @flags: driver flags
 *
 * Initializes the driver info and hw (all asics).
 * Returns 0 for success or an error on failure.
 * Called at driver startup.
 */
int amdgpu_device_init(struct amdgpu_device *adev,
                       struct drm_device *ddev,
                       struct pci_dev *pdev,
                       uint32_t flags)
{
        int r, i;
        bool runtime = false;
        u32 max_MBps;

        adev->shutdown = false;
        adev->dev = &pdev->dev;
        adev->ddev = ddev;
        adev->pdev = pdev;
        adev->flags = flags;
        adev->asic_type = flags & AMD_ASIC_MASK;
        adev->is_atom_bios = false;
        adev->usec_timeout = AMDGPU_MAX_USEC_TIMEOUT;
        adev->mc.gtt_size = 512 * 1024 * 1024;
        adev->accel_working = false;
        adev->num_rings = 0;
        adev->mman.buffer_funcs = NULL;
        adev->mman.buffer_funcs_ring = NULL;
        adev->vm_manager.vm_pte_funcs = NULL;
        adev->vm_manager.vm_pte_num_rings = 0;
        adev->gart.gart_funcs = NULL;
        adev->fence_context = fence_context_alloc(AMDGPU_MAX_RINGS);

        adev->smc_rreg = &amdgpu_invalid_rreg;
        adev->smc_wreg = &amdgpu_invalid_wreg;
        adev->pcie_rreg = &amdgpu_invalid_rreg;
        adev->pcie_wreg = &amdgpu_invalid_wreg;
        adev->pciep_rreg = &amdgpu_invalid_rreg;
        adev->pciep_wreg = &amdgpu_invalid_wreg;
        adev->uvd_ctx_rreg = &amdgpu_invalid_rreg;
        adev->uvd_ctx_wreg = &amdgpu_invalid_wreg;
        adev->didt_rreg = &amdgpu_invalid_rreg;
        adev->didt_wreg = &amdgpu_invalid_wreg;
        adev->gc_cac_rreg = &amdgpu_invalid_rreg;
        adev->gc_cac_wreg = &amdgpu_invalid_wreg;
        adev->audio_endpt_rreg = &amdgpu_block_invalid_rreg;
        adev->audio_endpt_wreg = &amdgpu_block_invalid_wreg;


        DRM_INFO("initializing kernel modesetting (%s 0x%04X:0x%04X 0x%04X:0x%04X 0x%02X).\n",
                 amdgpu_asic_name[adev->asic_type], pdev->vendor, pdev->device,
                 pdev->subsystem_vendor, pdev->subsystem_device, pdev->revision);

        /* mutex initialization are all done here so we
         * can recall function without having locking issues */
        mutex_init(&adev->vm_manager.lock);
        atomic_set(&adev->irq.ih.lock, 0);
        mutex_init(&adev->pm.mutex);
        mutex_init(&adev->gfx.gpu_clock_mutex);
        mutex_init(&adev->srbm_mutex);
        mutex_init(&adev->grbm_idx_mutex);
        mutex_init(&adev->mn_lock);
        hash_init(adev->mn_hash);

        amdgpu_check_arguments(adev);

        /* Registers mapping */
        /* TODO: block userspace mapping of io register */
        spin_lock_init(&adev->mmio_idx_lock);
        spin_lock_init(&adev->smc_idx_lock);
        spin_lock_init(&adev->pcie_idx_lock);
        spin_lock_init(&adev->uvd_ctx_idx_lock);
        spin_lock_init(&adev->didt_idx_lock);
        spin_lock_init(&adev->gc_cac_idx_lock);
        spin_lock_init(&adev->audio_endpt_idx_lock);
        spin_lock_init(&adev->mm_stats.lock);

        INIT_LIST_HEAD(&adev->shadow_list);
        mutex_init(&adev->shadow_list_lock);

        INIT_LIST_HEAD(&adev->gtt_list);
        spin_lock_init(&adev->gtt_list_lock);

        if (adev->asic_type >= CHIP_BONAIRE) {
                adev->rmmio_base = pci_resource_start(adev->pdev, 5);
                adev->rmmio_size = pci_resource_len(adev->pdev, 5);
        } else {
                adev->rmmio_base = pci_resource_start(adev->pdev, 2);
                adev->rmmio_size = pci_resource_len(adev->pdev, 2);
        }

        adev->rmmio = ioremap(adev->rmmio_base, adev->rmmio_size);
        if (adev->rmmio == NULL) {
                return -ENOMEM;
        }
        DRM_INFO("register mmio base: 0x%08X\n", (uint32_t)adev->rmmio_base);
        DRM_INFO("register mmio size: %u\n", (unsigned)adev->rmmio_size);

        if (adev->asic_type >= CHIP_BONAIRE)
                /* doorbell bar mapping */
                amdgpu_doorbell_init(adev);

        /* io port mapping */
        for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
                if (pci_resource_flags(adev->pdev, i) & IORESOURCE_IO) {
                        adev->rio_mem_size = pci_resource_len(adev->pdev, i);
                        adev->rio_mem = pci_iomap(adev->pdev, i, adev->rio_mem_size);
                        break;
                }
        }
        if (adev->rio_mem == NULL)
                DRM_ERROR("Unable to find PCI I/O BAR\n");

        /* early init functions */
        r = amdgpu_early_init(adev);
        if (r)
                return r;

        /* if we have > 1 VGA cards, then disable the amdgpu VGA resources */
        /* this will fail for cards that aren't VGA class devices, just
         * ignore it */
        vga_client_register(adev->pdev, adev, NULL, amdgpu_vga_set_decode);

        if (amdgpu_runtime_pm == 1)
                runtime = true;
        if (amdgpu_device_is_px(ddev))
                runtime = true;
        vga_switcheroo_register_client(adev->pdev, &amdgpu_switcheroo_ops, runtime);
        if (runtime)
                vga_switcheroo_init_domain_pm_ops(adev->dev, &adev->vga_pm_domain);

        /* Read BIOS */
        if (!amdgpu_get_bios(adev)) {
                r = -EINVAL;
                goto failed;
        }
        /* Must be an ATOMBIOS */
        if (!adev->is_atom_bios) {
                dev_err(adev->dev, "Expecting atombios for GPU\n");
                r = -EINVAL;
                goto failed;
        }
        r = amdgpu_atombios_init(adev);
        if (r) {
                dev_err(adev->dev, "amdgpu_atombios_init failed\n");
                goto failed;
        }

        /* detect if we are with an SRIOV vbios */
        amdgpu_device_detect_sriov_bios(adev);

        /* Post card if necessary */
        if (amdgpu_vpost_needed(adev)) {
                if (!adev->bios) {
                        dev_err(adev->dev, "no vBIOS found\n");
                        r = -EINVAL;
                        goto failed;
                }
                DRM_INFO("GPU posting now...\n");
                r = amdgpu_atom_asic_init(adev->mode_info.atom_context);
                if (r) {
                        dev_err(adev->dev, "gpu post error!\n");
                        goto failed;
                }
        } else {
                DRM_INFO("GPU post is not needed\n");
        }

        /* Initialize clocks */
        r = amdgpu_atombios_get_clock_info(adev);
        if (r) {
                dev_err(adev->dev, "amdgpu_atombios_get_clock_info failed\n");
                goto failed;
        }
        /* init i2c buses */
        amdgpu_atombios_i2c_init(adev);

        /* Fence driver */
        r = amdgpu_fence_driver_init(adev);
        if (r) {
                dev_err(adev->dev, "amdgpu_fence_driver_init failed\n");
                goto failed;
        }

        /* init the mode config */
        drm_mode_config_init(adev->ddev);

        r = amdgpu_init(adev);
        if (r) {
                dev_err(adev->dev, "amdgpu_init failed\n");
                amdgpu_fini(adev);
                goto failed;
        }

        adev->accel_working = true;

        /* Initialize the buffer migration limit. */
        if (amdgpu_moverate >= 0)
                max_MBps = amdgpu_moverate;
        else
                max_MBps = 8; /* Allow 8 MB/s. */
        /* Get a log2 for easy divisions. */
        adev->mm_stats.log2_max_MBps = ilog2(max(1u, max_MBps));

        amdgpu_fbdev_init(adev);

        r = amdgpu_ib_pool_init(adev);
        if (r) {
                dev_err(adev->dev, "IB initialization failed (%d).\n", r);
                goto failed;
        }

        r = amdgpu_ib_ring_tests(adev);
        if (r)
                DRM_ERROR("ib ring test failed (%d).\n", r);

        r = amdgpu_gem_debugfs_init(adev);
        if (r) {
                DRM_ERROR("registering gem debugfs failed (%d).\n", r);
        }

        r = amdgpu_debugfs_regs_init(adev);
        if (r) {
                DRM_ERROR("registering register debugfs failed (%d).\n", r);
        }

        r = amdgpu_debugfs_firmware_init(adev);
        if (r) {
                DRM_ERROR("registering firmware debugfs failed (%d).\n", r);
                return r;
        }

        if ((amdgpu_testing & 1)) {
                if (adev->accel_working)
                        amdgpu_test_moves(adev);
                else
                        DRM_INFO("amdgpu: acceleration disabled, skipping move tests\n");
        }
        if ((amdgpu_testing & 2)) {
                if (adev->accel_working)
                        amdgpu_test_syncing(adev);
                else
                        DRM_INFO("amdgpu: acceleration disabled, skipping sync tests\n");
        }
        if (amdgpu_benchmarking) {
                if (adev->accel_working)
                        amdgpu_benchmark(adev, amdgpu_benchmarking);
                else
                        DRM_INFO("amdgpu: acceleration disabled, skipping benchmarks\n");
        }

        /* enable clockgating, etc. after ib tests, etc. since some blocks require
         * explicit gating rather than handling it automatically.
         */
        r = amdgpu_late_init(adev);
        if (r) {
                dev_err(adev->dev, "amdgpu_late_init failed\n");
                goto failed;
        }

        return 0;

failed:
        if (runtime)
                vga_switcheroo_fini_domain_pm_ops(adev->dev);
        return r;
}

static void amdgpu_debugfs_remove_files(struct amdgpu_device *adev);

/**
 * amdgpu_device_fini - tear down the driver
 *
 * @adev: amdgpu_device pointer
 *
 * Tear down the driver info (all asics).
 * Called at driver shutdown.
 */
void amdgpu_device_fini(struct amdgpu_device *adev)
{
        int r;

        DRM_INFO("amdgpu: finishing device.\n");
        adev->shutdown = true;
        /* evict vram memory */
        amdgpu_bo_evict_vram(adev);
        amdgpu_ib_pool_fini(adev);
        amdgpu_fence_driver_fini(adev);
        drm_crtc_force_disable_all(adev->ddev);
        amdgpu_fbdev_fini(adev);
        r = amdgpu_fini(adev);
        kfree(adev->ip_block_status);
        adev->ip_block_status = NULL;
        adev->accel_working = false;
        /* free i2c buses */
        amdgpu_i2c_fini(adev);
        amdgpu_atombios_fini(adev);
        kfree(adev->bios);
        adev->bios = NULL;
        vga_switcheroo_unregister_client(adev->pdev);
        if (adev->flags & AMD_IS_PX)
                vga_switcheroo_fini_domain_pm_ops(adev->dev);
        vga_client_register(adev->pdev, NULL, NULL, NULL);
        if (adev->rio_mem)
                pci_iounmap(adev->pdev, adev->rio_mem);
        adev->rio_mem = NULL;
        iounmap(adev->rmmio);
        adev->rmmio = NULL;
        if (adev->asic_type >= CHIP_BONAIRE)
                amdgpu_doorbell_fini(adev);
        amdgpu_debugfs_regs_cleanup(adev);
        amdgpu_debugfs_remove_files(adev);
}


/*
 * Suspend & resume.
 */
/**
 * amdgpu_device_suspend - initiate device suspend
 *
 * @pdev: drm dev pointer
 * @state: suspend state
 *
 * Puts the hw in the suspend state (all asics).
 * Returns 0 for success or an error on failure.
 * Called at driver suspend.
 */
int amdgpu_device_suspend(struct drm_device *dev, bool suspend, bool fbcon)
{
        struct amdgpu_device *adev;
        struct drm_crtc *crtc;
        struct drm_connector *connector;
        int r;

        if (dev == NULL || dev->dev_private == NULL) {
                return -ENODEV;
        }

        adev = dev->dev_private;

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

        drm_kms_helper_poll_disable(dev);

        /* turn off display hw */
        drm_modeset_lock_all(dev);
        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
                drm_helper_connector_dpms(connector, DRM_MODE_DPMS_OFF);
        }
        drm_modeset_unlock_all(dev);

        /* unpin the front buffers and cursors */
        list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
                struct amdgpu_crtc *amdgpu_crtc = to_amdgpu_crtc(crtc);
                struct amdgpu_framebuffer *rfb = to_amdgpu_framebuffer(crtc->primary->fb);
                struct amdgpu_bo *robj;

                if (amdgpu_crtc->cursor_bo) {
                        struct amdgpu_bo *aobj = gem_to_amdgpu_bo(amdgpu_crtc->cursor_bo);
                        r = amdgpu_bo_reserve(aobj, false);
                        if (r == 0) {
                                amdgpu_bo_unpin(aobj);
                                amdgpu_bo_unreserve(aobj);
                        }
                }

                if (rfb == NULL || rfb->obj == NULL) {
                        continue;
                }
                robj = gem_to_amdgpu_bo(rfb->obj);
                /* don't unpin kernel fb objects */
                if (!amdgpu_fbdev_robj_is_fb(adev, robj)) {
                        r = amdgpu_bo_reserve(robj, false);
                        if (r == 0) {
                                amdgpu_bo_unpin(robj);
                                amdgpu_bo_unreserve(robj);
                        }
                }
        }
        /* evict vram memory */
        amdgpu_bo_evict_vram(adev);

        amdgpu_fence_driver_suspend(adev);

        r = amdgpu_suspend(adev);

        /* evict remaining vram memory */
        amdgpu_bo_evict_vram(adev);

        pci_save_state(dev->pdev);
        if (suspend) {
                /* Shut down the device */
                pci_disable_device(dev->pdev);
                pci_set_power_state(dev->pdev, PCI_D3hot);
        } else {
                r = amdgpu_asic_reset(adev);
                if (r)
                        DRM_ERROR("amdgpu asic reset failed\n");
        }

        if (fbcon) {
                console_lock();
                amdgpu_fbdev_set_suspend(adev, 1);
                console_unlock();
        }
        return 0;
}

/**
 * amdgpu_device_resume - initiate device resume
 *
 * @pdev: drm dev pointer
 *
 * Bring the hw back to operating state (all asics).
 * Returns 0 for success or an error on failure.
 * Called at driver resume.
 */
int amdgpu_device_resume(struct drm_device *dev, bool resume, bool fbcon)
{
        struct drm_connector *connector;
        struct amdgpu_device *adev = dev->dev_private;
        struct drm_crtc *crtc;
        int r;

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

        if (fbcon)
                console_lock();

        if (resume) {
                pci_set_power_state(dev->pdev, PCI_D0);
                pci_restore_state(dev->pdev);
                r = pci_enable_device(dev->pdev);
                if (r) {
                        if (fbcon)
                                console_unlock();
                        return r;
                }
        }

        /* post card */
        if (!amdgpu_card_posted(adev) || !resume) {
                r = amdgpu_atom_asic_init(adev->mode_info.atom_context);
                if (r)
                        DRM_ERROR("amdgpu asic init failed\n");
        }

        r = amdgpu_resume(adev);
        if (r)
                DRM_ERROR("amdgpu_resume failed (%d).\n", r);

        amdgpu_fence_driver_resume(adev);

        if (resume) {
                r = amdgpu_ib_ring_tests(adev);
                if (r)
                        DRM_ERROR("ib ring test failed (%d).\n", r);
        }

        r = amdgpu_late_init(adev);
        if (r)
                return r;

        /* pin cursors */
        list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
                struct amdgpu_crtc *amdgpu_crtc = to_amdgpu_crtc(crtc);

                if (amdgpu_crtc->cursor_bo) {
                        struct amdgpu_bo *aobj = gem_to_amdgpu_bo(amdgpu_crtc->cursor_bo);
                        r = amdgpu_bo_reserve(aobj, false);
                        if (r == 0) {
                                r = amdgpu_bo_pin(aobj,
                                                  AMDGPU_GEM_DOMAIN_VRAM,
                                                  &amdgpu_crtc->cursor_addr);
                                if (r != 0)
                                        DRM_ERROR("Failed to pin cursor BO (%d)\n", r);
                                amdgpu_bo_unreserve(aobj);
                        }
                }
        }

        /* blat the mode back in */
        if (fbcon) {
                drm_helper_resume_force_mode(dev);
                /* turn on display hw */
                drm_modeset_lock_all(dev);
                list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
                        drm_helper_connector_dpms(connector, DRM_MODE_DPMS_ON);
                }
                drm_modeset_unlock_all(dev);
        }

        drm_kms_helper_poll_enable(dev);

        /*
         * Most of the connector probing functions try to acquire runtime pm
         * refs to ensure that the GPU is powered on when connector polling is
         * performed. Since we're calling this from a runtime PM callback,
         * trying to acquire rpm refs will cause us to deadlock.
         *
         * Since we're guaranteed to be holding the rpm lock, it's safe to
         * temporarily disable the rpm helpers so this doesn't deadlock us.
         */
#ifdef CONFIG_PM
        dev->dev->power.disable_depth++;
#endif
        drm_helper_hpd_irq_event(dev);
#ifdef CONFIG_PM
        dev->dev->power.disable_depth--;
#endif

        if (fbcon) {
                amdgpu_fbdev_set_suspend(adev, 0);
                console_unlock();
        }

        return 0;
}

static bool amdgpu_check_soft_reset(struct amdgpu_device *adev)
{
        int i;
        bool asic_hang = false;

        for (i = 0; i < adev->num_ip_blocks; i++) {
                if (!adev->ip_block_status[i].valid)
                        continue;
                if (adev->ip_blocks[i].funcs->check_soft_reset)
                        adev->ip_block_status[i].hang =
                                adev->ip_blocks[i].funcs->check_soft_reset(adev);
                if (adev->ip_block_status[i].hang) {
                        DRM_INFO("IP block:%d is hang!\n", i);
                        asic_hang = true;
                }
        }
        return asic_hang;
}

static int amdgpu_pre_soft_reset(struct amdgpu_device *adev)
{
        int i, r = 0;

        for (i = 0; i < adev->num_ip_blocks; i++) {
                if (!adev->ip_block_status[i].valid)
                        continue;
                if (adev->ip_block_status[i].hang &&
                    adev->ip_blocks[i].funcs->pre_soft_reset) {
                        r = adev->ip_blocks[i].funcs->pre_soft_reset(adev);
                        if (r)
                                return r;
                }
        }

        return 0;
}

static bool amdgpu_need_full_reset(struct amdgpu_device *adev)
{
        int i;

        for (i = 0; i < adev->num_ip_blocks; i++) {
                if (!adev->ip_block_status[i].valid)
                        continue;
                if ((adev->ip_blocks[i].type == AMD_IP_BLOCK_TYPE_GMC) ||
                    (adev->ip_blocks[i].type == AMD_IP_BLOCK_TYPE_SMC) ||
                    (adev->ip_blocks[i].type == AMD_IP_BLOCK_TYPE_ACP) ||
                    (adev->ip_blocks[i].type == AMD_IP_BLOCK_TYPE_DCE)) {
                        if (adev->ip_block_status[i].hang) {
                                DRM_INFO("Some block need full reset!\n");
                                return true;
                        }
                }
        }
        return false;
}

static int amdgpu_soft_reset(struct amdgpu_device *adev)
{
        int i, r = 0;

        for (i = 0; i < adev->num_ip_blocks; i++) {
                if (!adev->ip_block_status[i].valid)
                        continue;
                if (adev->ip_block_status[i].hang &&
                    adev->ip_blocks[i].funcs->soft_reset) {
                        r = adev->ip_blocks[i].funcs->soft_reset(adev);
                        if (r)
                                return r;
                }
        }

        return 0;
}

static int amdgpu_post_soft_reset(struct amdgpu_device *adev)
{
        int i, r = 0;

        for (i = 0; i < adev->num_ip_blocks; i++) {
                if (!adev->ip_block_status[i].valid)
                        continue;
                if (adev->ip_block_status[i].hang &&
                    adev->ip_blocks[i].funcs->post_soft_reset)
                        r = adev->ip_blocks[i].funcs->post_soft_reset(adev);
                if (r)
                        return r;
        }

        return 0;
}

bool amdgpu_need_backup(struct amdgpu_device *adev)
{
        if (adev->flags & AMD_IS_APU)
                return false;

        return amdgpu_lockup_timeout > 0 ? true : false;
}

static int amdgpu_recover_vram_from_shadow(struct amdgpu_device *adev,
                                           struct amdgpu_ring *ring,
                                           struct amdgpu_bo *bo,
                                           struct fence **fence)
{
        uint32_t domain;
        int r;

       if (!bo->shadow)
               return 0;

       r = amdgpu_bo_reserve(bo, false);
       if (r)
               return r;
       domain = amdgpu_mem_type_to_domain(bo->tbo.mem.mem_type);
       /* if bo has been evicted, then no need to recover */
       if (domain == AMDGPU_GEM_DOMAIN_VRAM) {
               r = amdgpu_bo_restore_from_shadow(adev, ring, bo,
                                                 NULL, fence, true);
               if (r) {
                       DRM_ERROR("recover page table failed!\n");
                       goto err;
               }
       }
err:
       amdgpu_bo_unreserve(bo);
       return r;
}

/**
 * amdgpu_gpu_reset - reset the asic
 *
 * @adev: amdgpu device pointer
 *
 * Attempt the reset the GPU if it has hung (all asics).
 * Returns 0 for success or an error on failure.
 */
int amdgpu_gpu_reset(struct amdgpu_device *adev)
{
        int i, r;
        int resched;
        bool need_full_reset;

        if (!amdgpu_check_soft_reset(adev)) {
                DRM_INFO("No hardware hang detected. Did some blocks stall?\n");
                return 0;
        }

        atomic_inc(&adev->gpu_reset_counter);

        /* block TTM */
        resched = ttm_bo_lock_delayed_workqueue(&adev->mman.bdev);

        /* block scheduler */
        for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
                struct amdgpu_ring *ring = adev->rings[i];

                if (!ring)
                        continue;
                kthread_park(ring->sched.thread);
                amd_sched_hw_job_reset(&ring->sched);
        }
        /* after all hw jobs are reset, hw fence is meaningless, so force_completion */
        amdgpu_fence_driver_force_completion(adev);

        need_full_reset = amdgpu_need_full_reset(adev);

        if (!need_full_reset) {
                amdgpu_pre_soft_reset(adev);
                r = amdgpu_soft_reset(adev);
                amdgpu_post_soft_reset(adev);
                if (r || amdgpu_check_soft_reset(adev)) {
                        DRM_INFO("soft reset failed, will fallback to full reset!\n");
                        need_full_reset = true;
                }
        }

        if (need_full_reset) {
                /* save scratch */
                amdgpu_atombios_scratch_regs_save(adev);
                r = amdgpu_suspend(adev);

retry:
                /* Disable fb access */
                if (adev->mode_info.num_crtc) {
                        struct amdgpu_mode_mc_save save;
                        amdgpu_display_stop_mc_access(adev, &save);
                        amdgpu_wait_for_idle(adev, AMD_IP_BLOCK_TYPE_GMC);
                }

                r = amdgpu_asic_reset(adev);
                /* post card */
                amdgpu_atom_asic_init(adev->mode_info.atom_context);

                if (!r) {
                        dev_info(adev->dev, "GPU reset succeeded, trying to resume\n");
                        r = amdgpu_resume(adev);
                }
                /* restore scratch */
                amdgpu_atombios_scratch_regs_restore(adev);
        }
        if (!r) {
                amdgpu_irq_gpu_reset_resume_helper(adev);
                if (need_full_reset && amdgpu_need_backup(adev)) {
                        r = amdgpu_ttm_recover_gart(adev);
                        if (r)
                                DRM_ERROR("gart recovery failed!!!\n");
                }
                r = amdgpu_ib_ring_tests(adev);
                if (r) {
                        dev_err(adev->dev, "ib ring test failed (%d).\n", r);
                        r = amdgpu_suspend(adev);
                        need_full_reset = true;
                        goto retry;
                }
                /**
                 * recovery vm page tables, since we cannot depend on VRAM is
                 * consistent after gpu full reset.
                 */
                if (need_full_reset && amdgpu_need_backup(adev)) {
                        struct amdgpu_ring *ring = adev->mman.buffer_funcs_ring;
                        struct amdgpu_bo *bo, *tmp;
                        struct fence *fence = NULL, *next = NULL;

                        DRM_INFO("recover vram bo from shadow\n");
                        mutex_lock(&adev->shadow_list_lock);
                        list_for_each_entry_safe(bo, tmp, &adev->shadow_list, shadow_list) {
                                amdgpu_recover_vram_from_shadow(adev, ring, bo, &next);
                                if (fence) {
                                        r = fence_wait(fence, false);
                                        if (r) {
                                                WARN(r, "recovery from shadow isn't comleted\n");
                                                break;
                                        }
                                }

                                fence_put(fence);
                                fence = next;
                        }
                        mutex_unlock(&adev->shadow_list_lock);
                        if (fence) {
                                r = fence_wait(fence, false);
                                if (r)
                                        WARN(r, "recovery from shadow isn't comleted\n");
                        }
                        fence_put(fence);
                }
                for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
                        struct amdgpu_ring *ring = adev->rings[i];
                        if (!ring)
                                continue;

                        amd_sched_job_recovery(&ring->sched);
                        kthread_unpark(ring->sched.thread);
                }
        } else {
                dev_err(adev->dev, "asic resume failed (%d).\n", r);
                for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
                        if (adev->rings[i]) {
                                kthread_unpark(adev->rings[i]->sched.thread);
                        }
                }
        }

        drm_helper_resume_force_mode(adev->ddev);

        ttm_bo_unlock_delayed_workqueue(&adev->mman.bdev, resched);
        if (r) {
                /* bad news, how to tell it to userspace ? */
                dev_info(adev->dev, "GPU reset failed\n");
        }

        return r;
}

void amdgpu_get_pcie_info(struct amdgpu_device *adev)
{
        u32 mask;
        int ret;

        if (amdgpu_pcie_gen_cap)
                adev->pm.pcie_gen_mask = amdgpu_pcie_gen_cap;

        if (amdgpu_pcie_lane_cap)
                adev->pm.pcie_mlw_mask = amdgpu_pcie_lane_cap;

        /* covers APUs as well */
        if (pci_is_root_bus(adev->pdev->bus)) {
                if (adev->pm.pcie_gen_mask == 0)
                        adev->pm.pcie_gen_mask = AMDGPU_DEFAULT_PCIE_GEN_MASK;
                if (adev->pm.pcie_mlw_mask == 0)
                        adev->pm.pcie_mlw_mask = AMDGPU_DEFAULT_PCIE_MLW_MASK;
                return;
        }

        if (adev->pm.pcie_gen_mask == 0) {
                ret = drm_pcie_get_speed_cap_mask(adev->ddev, &mask);
                if (!ret) {
                        adev->pm.pcie_gen_mask = (CAIL_ASIC_PCIE_LINK_SPEED_SUPPORT_GEN1 |
                                                  CAIL_ASIC_PCIE_LINK_SPEED_SUPPORT_GEN2 |
                                                  CAIL_ASIC_PCIE_LINK_SPEED_SUPPORT_GEN3);

                        if (mask & DRM_PCIE_SPEED_25)
                                adev->pm.pcie_gen_mask |= CAIL_PCIE_LINK_SPEED_SUPPORT_GEN1;
                        if (mask & DRM_PCIE_SPEED_50)
                                adev->pm.pcie_gen_mask |= CAIL_PCIE_LINK_SPEED_SUPPORT_GEN2;
                        if (mask & DRM_PCIE_SPEED_80)
                                adev->pm.pcie_gen_mask |= CAIL_PCIE_LINK_SPEED_SUPPORT_GEN3;
                } else {
                        adev->pm.pcie_gen_mask = AMDGPU_DEFAULT_PCIE_GEN_MASK;
                }
        }
        if (adev->pm.pcie_mlw_mask == 0) {
                ret = drm_pcie_get_max_link_width(adev->ddev, &mask);
                if (!ret) {
                        switch (mask) {
                        case 32:
                                adev->pm.pcie_mlw_mask = (CAIL_PCIE_LINK_WIDTH_SUPPORT_X32 |
                                                          CAIL_PCIE_LINK_WIDTH_SUPPORT_X16 |
                                                          CAIL_PCIE_LINK_WIDTH_SUPPORT_X12 |
                                                          CAIL_PCIE_LINK_WIDTH_SUPPORT_X8 |
                                                          CAIL_PCIE_LINK_WIDTH_SUPPORT_X4 |
                                                          CAIL_PCIE_LINK_WIDTH_SUPPORT_X2 |
                                                          CAIL_PCIE_LINK_WIDTH_SUPPORT_X1);
                                break;
                        case 16:
                                adev->pm.pcie_mlw_mask = (CAIL_PCIE_LINK_WIDTH_SUPPORT_X16 |
                                                          CAIL_PCIE_LINK_WIDTH_SUPPORT_X12 |
                                                          CAIL_PCIE_LINK_WIDTH_SUPPORT_X8 |
                                                          CAIL_PCIE_LINK_WIDTH_SUPPORT_X4 |
                                                          CAIL_PCIE_LINK_WIDTH_SUPPORT_X2 |
                                                          CAIL_PCIE_LINK_WIDTH_SUPPORT_X1);
                                break;
                        case 12:
                                adev->pm.pcie_mlw_mask = (CAIL_PCIE_LINK_WIDTH_SUPPORT_X12 |
                                                          CAIL_PCIE_LINK_WIDTH_SUPPORT_X8 |
                                                          CAIL_PCIE_LINK_WIDTH_SUPPORT_X4 |
                                                          CAIL_PCIE_LINK_WIDTH_SUPPORT_X2 |
                                                          CAIL_PCIE_LINK_WIDTH_SUPPORT_X1);
                                break;
                        case 8:
                                adev->pm.pcie_mlw_mask = (CAIL_PCIE_LINK_WIDTH_SUPPORT_X8 |
                                                          CAIL_PCIE_LINK_WIDTH_SUPPORT_X4 |
                                                          CAIL_PCIE_LINK_WIDTH_SUPPORT_X2 |
                                                          CAIL_PCIE_LINK_WIDTH_SUPPORT_X1);
                                break;
                        case 4:
                                adev->pm.pcie_mlw_mask = (CAIL_PCIE_LINK_WIDTH_SUPPORT_X4 |
                                                          CAIL_PCIE_LINK_WIDTH_SUPPORT_X2 |
                                                          CAIL_PCIE_LINK_WIDTH_SUPPORT_X1);
                                break;
                        case 2:
                                adev->pm.pcie_mlw_mask = (CAIL_PCIE_LINK_WIDTH_SUPPORT_X2 |
                                                          CAIL_PCIE_LINK_WIDTH_SUPPORT_X1);
                                break;
                        case 1:
                                adev->pm.pcie_mlw_mask = CAIL_PCIE_LINK_WIDTH_SUPPORT_X1;
                                break;
                        default:
                                break;
                        }
                } else {
                        adev->pm.pcie_mlw_mask = AMDGPU_DEFAULT_PCIE_MLW_MASK;
                }
        }
}

/*
 * Debugfs
 */
int amdgpu_debugfs_add_files(struct amdgpu_device *adev,
                             const struct drm_info_list *files,
                             unsigned nfiles)
{
        unsigned i;

        for (i = 0; i < adev->debugfs_count; i++) {
                if (adev->debugfs[i].files == files) {
                        /* Already registered */
                        return 0;
                }
        }

        i = adev->debugfs_count + 1;
        if (i > AMDGPU_DEBUGFS_MAX_COMPONENTS) {
                DRM_ERROR("Reached maximum number of debugfs components.\n");
                DRM_ERROR("Report so we increase "
                          "AMDGPU_DEBUGFS_MAX_COMPONENTS.\n");
                return -EINVAL;
        }
        adev->debugfs[adev->debugfs_count].files = files;
        adev->debugfs[adev->debugfs_count].num_files = nfiles;
        adev->debugfs_count = i;
#if defined(CONFIG_DEBUG_FS)
        drm_debugfs_create_files(files, nfiles,
                                 adev->ddev->control->debugfs_root,
                                 adev->ddev->control);
        drm_debugfs_create_files(files, nfiles,
                                 adev->ddev->primary->debugfs_root,
                                 adev->ddev->primary);
#endif
        return 0;
}

static void amdgpu_debugfs_remove_files(struct amdgpu_device *adev)
{
#if defined(CONFIG_DEBUG_FS)
        unsigned i;

        for (i = 0; i < adev->debugfs_count; i++) {
                drm_debugfs_remove_files(adev->debugfs[i].files,
                                         adev->debugfs[i].num_files,
                                         adev->ddev->control);
                drm_debugfs_remove_files(adev->debugfs[i].files,
                                         adev->debugfs[i].num_files,
                                         adev->ddev->primary);
        }
#endif
}

#if defined(CONFIG_DEBUG_FS)

static ssize_t amdgpu_debugfs_regs_read(struct file *f, char __user *buf,
                                        size_t size, loff_t *pos)
{
        struct amdgpu_device *adev = f->f_inode->i_private;
        ssize_t result = 0;
        int r;
        bool pm_pg_lock, use_bank;
        unsigned instance_bank, sh_bank, se_bank;

        if (size & 0x3 || *pos & 0x3)
                return -EINVAL;

        /* are we reading registers for which a PG lock is necessary? */
        pm_pg_lock = (*pos >> 23) & 1;

        if (*pos & (1ULL << 62)) {
                se_bank = (*pos >> 24) & 0x3FF;
                sh_bank = (*pos >> 34) & 0x3FF;
                instance_bank = (*pos >> 44) & 0x3FF;
                use_bank = 1;
        } else {
                use_bank = 0;
        }

        *pos &= 0x3FFFF;

        if (use_bank) {
                if (sh_bank >= adev->gfx.config.max_sh_per_se ||
                    se_bank >= adev->gfx.config.max_shader_engines)
                        return -EINVAL;
                mutex_lock(&adev->grbm_idx_mutex);
                amdgpu_gfx_select_se_sh(adev, se_bank,
                                        sh_bank, instance_bank);
        }

        if (pm_pg_lock)
                mutex_lock(&adev->pm.mutex);

        while (size) {
                uint32_t value;

                if (*pos > adev->rmmio_size)
                        goto end;

                value = RREG32(*pos >> 2);
                r = put_user(value, (uint32_t *)buf);
                if (r) {
                        result = r;
                        goto end;
                }

                result += 4;
                buf += 4;
                *pos += 4;
                size -= 4;
        }

end:
        if (use_bank) {
                amdgpu_gfx_select_se_sh(adev, 0xffffffff, 0xffffffff, 0xffffffff);
                mutex_unlock(&adev->grbm_idx_mutex);
        }

        if (pm_pg_lock)
                mutex_unlock(&adev->pm.mutex);

        return result;
}

static ssize_t amdgpu_debugfs_regs_write(struct file *f, const char __user *buf,
                                         size_t size, loff_t *pos)
{
        struct amdgpu_device *adev = f->f_inode->i_private;
        ssize_t result = 0;
        int r;

        if (size & 0x3 || *pos & 0x3)
                return -EINVAL;

        while (size) {
                uint32_t value;

                if (*pos > adev->rmmio_size)
                        return result;

                r = get_user(value, (uint32_t *)buf);
                if (r)
                        return r;

                WREG32(*pos >> 2, value);

                result += 4;
                buf += 4;
                *pos += 4;
                size -= 4;
        }

        return result;
}

static ssize_t amdgpu_debugfs_regs_pcie_read(struct file *f, char __user *buf,
                                        size_t size, loff_t *pos)
{
        struct amdgpu_device *adev = f->f_inode->i_private;
        ssize_t result = 0;
        int r;

        if (size & 0x3 || *pos & 0x3)
                return -EINVAL;

        while (size) {
                uint32_t value;

                value = RREG32_PCIE(*pos >> 2);
                r = put_user(value, (uint32_t *)buf);
                if (r)
                        return r;

                result += 4;
                buf += 4;
                *pos += 4;
                size -= 4;
        }

        return result;
}

static ssize_t amdgpu_debugfs_regs_pcie_write(struct file *f, const char __user *buf,
                                         size_t size, loff_t *pos)
{
        struct amdgpu_device *adev = f->f_inode->i_private;
        ssize_t result = 0;
        int r;

        if (size & 0x3 || *pos & 0x3)
                return -EINVAL;

        while (size) {
                uint32_t value;

                r = get_user(value, (uint32_t *)buf);
                if (r)
                        return r;

                WREG32_PCIE(*pos >> 2, value);

                result += 4;
                buf += 4;
                *pos += 4;
                size -= 4;
        }

        return result;
}

static ssize_t amdgpu_debugfs_regs_didt_read(struct file *f, char __user *buf,
                                        size_t size, loff_t *pos)
{
        struct amdgpu_device *adev = f->f_inode->i_private;
        ssize_t result = 0;
        int r;

        if (size & 0x3 || *pos & 0x3)
                return -EINVAL;

        while (size) {
                uint32_t value;

                value = RREG32_DIDT(*pos >> 2);
                r = put_user(value, (uint32_t *)buf);
                if (r)
                        return r;

                result += 4;
                buf += 4;
                *pos += 4;
                size -= 4;
        }

        return result;
}

static ssize_t amdgpu_debugfs_regs_didt_write(struct file *f, const char __user *buf,
                                         size_t size, loff_t *pos)
{
        struct amdgpu_device *adev = f->f_inode->i_private;
        ssize_t result = 0;
        int r;

        if (size & 0x3 || *pos & 0x3)
                return -EINVAL;

        while (size) {
                uint32_t value;

                r = get_user(value, (uint32_t *)buf);
                if (r)
                        return r;

                WREG32_DIDT(*pos >> 2, value);

                result += 4;
                buf += 4;
                *pos += 4;
                size -= 4;
        }

        return result;
}

static ssize_t amdgpu_debugfs_regs_smc_read(struct file *f, char __user *buf,
                                        size_t size, loff_t *pos)
{
        struct amdgpu_device *adev = f->f_inode->i_private;
        ssize_t result = 0;
        int r;

        if (size & 0x3 || *pos & 0x3)
                return -EINVAL;

        while (size) {
                uint32_t value;

                value = RREG32_SMC(*pos);
                r = put_user(value, (uint32_t *)buf);
                if (r)
                        return r;

                result += 4;
                buf += 4;
                *pos += 4;
                size -= 4;
        }

        return result;
}

static ssize_t amdgpu_debugfs_regs_smc_write(struct file *f, const char __user *buf,
                                         size_t size, loff_t *pos)
{
        struct amdgpu_device *adev = f->f_inode->i_private;
        ssize_t result = 0;
        int r;

        if (size & 0x3 || *pos & 0x3)
                return -EINVAL;

        while (size) {
                uint32_t value;

                r = get_user(value, (uint32_t *)buf);
                if (r)
                        return r;

                WREG32_SMC(*pos, value);

                result += 4;
                buf += 4;
                *pos += 4;
                size -= 4;
        }

        return result;
}

static ssize_t amdgpu_debugfs_gca_config_read(struct file *f, char __user *buf,
                                        size_t size, loff_t *pos)
{
        struct amdgpu_device *adev = f->f_inode->i_private;
        ssize_t result = 0;
        int r;
        uint32_t *config, no_regs = 0;

        if (size & 0x3 || *pos & 0x3)
                return -EINVAL;

        config = kmalloc_array(256, sizeof(*config), GFP_KERNEL);
        if (!config)
                return -ENOMEM;

        /* version, increment each time something is added */
        config[no_regs++] = 2;
        config[no_regs++] = adev->gfx.config.max_shader_engines;
        config[no_regs++] = adev->gfx.config.max_tile_pipes;
        config[no_regs++] = adev->gfx.config.max_cu_per_sh;
        config[no_regs++] = adev->gfx.config.max_sh_per_se;
        config[no_regs++] = adev->gfx.config.max_backends_per_se;
        config[no_regs++] = adev->gfx.config.max_texture_channel_caches;
        config[no_regs++] = adev->gfx.config.max_gprs;
        config[no_regs++] = adev->gfx.config.max_gs_threads;
        config[no_regs++] = adev->gfx.config.max_hw_contexts;
        config[no_regs++] = adev->gfx.config.sc_prim_fifo_size_frontend;
        config[no_regs++] = adev->gfx.config.sc_prim_fifo_size_backend;
        config[no_regs++] = adev->gfx.config.sc_hiz_tile_fifo_size;
        config[no_regs++] = adev->gfx.config.sc_earlyz_tile_fifo_size;
        config[no_regs++] = adev->gfx.config.num_tile_pipes;
        config[no_regs++] = adev->gfx.config.backend_enable_mask;
        config[no_regs++] = adev->gfx.config.mem_max_burst_length_bytes;
        config[no_regs++] = adev->gfx.config.mem_row_size_in_kb;
        config[no_regs++] = adev->gfx.config.shader_engine_tile_size;
        config[no_regs++] = adev->gfx.config.num_gpus;
        config[no_regs++] = adev->gfx.config.multi_gpu_tile_size;
        config[no_regs++] = adev->gfx.config.mc_arb_ramcfg;
        config[no_regs++] = adev->gfx.config.gb_addr_config;
        config[no_regs++] = adev->gfx.config.num_rbs;

        /* rev==1 */
        config[no_regs++] = adev->rev_id;
        config[no_regs++] = adev->pg_flags;
        config[no_regs++] = adev->cg_flags;

        /* rev==2 */
        config[no_regs++] = adev->family;
        config[no_regs++] = adev->external_rev_id;

        while (size && (*pos < no_regs * 4)) {
                uint32_t value;

                value = config[*pos >> 2];
                r = put_user(value, (uint32_t *)buf);
                if (r) {
                        kfree(config);
                        return r;
                }

                result += 4;
                buf += 4;
                *pos += 4;
                size -= 4;
        }

        kfree(config);
        return result;
}

static ssize_t amdgpu_debugfs_sensor_read(struct file *f, char __user *buf,
                                        size_t size, loff_t *pos)
{
        struct amdgpu_device *adev = f->f_inode->i_private;
        int idx, r;
        int32_t value;

        if (size != 4 || *pos & 0x3)
                return -EINVAL;

        /* convert offset to sensor number */
        idx = *pos >> 2;

        if (adev->powerplay.pp_funcs && adev->powerplay.pp_funcs->read_sensor)
                r = adev->powerplay.pp_funcs->read_sensor(adev->powerplay.pp_handle, idx, &value);
        else
                return -EINVAL;

        if (!r)
                r = put_user(value, (int32_t *)buf);

        return !r ? 4 : r;
}

static const struct file_operations amdgpu_debugfs_regs_fops = {
        .owner = THIS_MODULE,
        .read = amdgpu_debugfs_regs_read,
        .write = amdgpu_debugfs_regs_write,
        .llseek = default_llseek
};
static const struct file_operations amdgpu_debugfs_regs_didt_fops = {
        .owner = THIS_MODULE,
        .read = amdgpu_debugfs_regs_didt_read,
        .write = amdgpu_debugfs_regs_didt_write,
        .llseek = default_llseek
};
static const struct file_operations amdgpu_debugfs_regs_pcie_fops = {
        .owner = THIS_MODULE,
        .read = amdgpu_debugfs_regs_pcie_read,
        .write = amdgpu_debugfs_regs_pcie_write,
        .llseek = default_llseek
};
static const struct file_operations amdgpu_debugfs_regs_smc_fops = {
        .owner = THIS_MODULE,
        .read = amdgpu_debugfs_regs_smc_read,
        .write = amdgpu_debugfs_regs_smc_write,
        .llseek = default_llseek
};

static const struct file_operations amdgpu_debugfs_gca_config_fops = {
        .owner = THIS_MODULE,
        .read = amdgpu_debugfs_gca_config_read,
        .llseek = default_llseek
};

static const struct file_operations amdgpu_debugfs_sensors_fops = {
        .owner = THIS_MODULE,
        .read = amdgpu_debugfs_sensor_read,
        .llseek = default_llseek
};

static const struct file_operations *debugfs_regs[] = {
        &amdgpu_debugfs_regs_fops,
        &amdgpu_debugfs_regs_didt_fops,
        &amdgpu_debugfs_regs_pcie_fops,
        &amdgpu_debugfs_regs_smc_fops,
        &amdgpu_debugfs_gca_config_fops,
        &amdgpu_debugfs_sensors_fops,
};

static const char *debugfs_regs_names[] = {
        "amdgpu_regs",
        "amdgpu_regs_didt",
        "amdgpu_regs_pcie",
        "amdgpu_regs_smc",
        "amdgpu_gca_config",
        "amdgpu_sensors",
};

static int amdgpu_debugfs_regs_init(struct amdgpu_device *adev)
{
        struct drm_minor *minor = adev->ddev->primary;
        struct dentry *ent, *root = minor->debugfs_root;
        unsigned i, j;

        for (i = 0; i < ARRAY_SIZE(debugfs_regs); i++) {
                ent = debugfs_create_file(debugfs_regs_names[i],
                                          S_IFREG | S_IRUGO, root,
                                          adev, debugfs_regs[i]);
                if (IS_ERR(ent)) {
                        for (j = 0; j < i; j++) {
                                debugfs_remove(adev->debugfs_regs[i]);
                                adev->debugfs_regs[i] = NULL;
                        }
                        return PTR_ERR(ent);
                }

                if (!i)
                        i_size_write(ent->d_inode, adev->rmmio_size);
                adev->debugfs_regs[i] = ent;
        }

        return 0;
}

static void amdgpu_debugfs_regs_cleanup(struct amdgpu_device *adev)
{
        unsigned i;

        for (i = 0; i < ARRAY_SIZE(debugfs_regs); i++) {
                if (adev->debugfs_regs[i]) {
                        debugfs_remove(adev->debugfs_regs[i]);
                        adev->debugfs_regs[i] = NULL;
                }
        }
}

int amdgpu_debugfs_init(struct drm_minor *minor)
{
        return 0;
}

void amdgpu_debugfs_cleanup(struct drm_minor *minor)
{
}
#else
static int amdgpu_debugfs_regs_init(struct amdgpu_device *adev)
{
        return 0;
}
static void amdgpu_debugfs_regs_cleanup(struct amdgpu_device *adev) { }
#endif