/*
 * Copyright 2009 Jerome Glisse.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 */
/*
 * Authors:
 *    Jerome Glisse <glisse@freedesktop.org>
 *    Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
 *    Dave Airlie
 */
#include <linux/list.h>
#include <linux/slab.h>
#include <drm/drmP.h>
#include <drm/amdgpu_drm.h>
#include <drm/drm_cache.h>
#include "amdgpu.h"
#include "amdgpu_trace.h"
#include "amdgpu_amdkfd.h"

/**
 * DOC: amdgpu_object
 *
 * This defines the interfaces to operate on an &amdgpu_bo buffer object which
 * represents memory used by driver (VRAM, system memory, etc.). The driver
 * provides DRM/GEM APIs to userspace. DRM/GEM APIs then use these interfaces
 * to create/destroy/set buffer object which are then managed by the kernel TTM
 * memory manager.
 * The interfaces are also used internally by kernel clients, including gfx,
 * uvd, etc. for kernel managed allocations used by the GPU.
 *
 */

/**
 * amdgpu_bo_subtract_pin_size - Remove BO from pin_size accounting
 *
 * @bo: &amdgpu_bo buffer object
 *
 * This function is called when a BO stops being pinned, and updates the
 * &amdgpu_device pin_size values accordingly.
 */
static void amdgpu_bo_subtract_pin_size(struct amdgpu_bo *bo)
{
        struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);

        if (bo->tbo.mem.mem_type == TTM_PL_VRAM) {
                atomic64_sub(amdgpu_bo_size(bo), &adev->vram_pin_size);
                atomic64_sub(amdgpu_vram_mgr_bo_visible_size(bo),
                             &adev->visible_pin_size);
        } else if (bo->tbo.mem.mem_type == TTM_PL_TT) {
                atomic64_sub(amdgpu_bo_size(bo), &adev->gart_pin_size);
        }
}

static void amdgpu_bo_destroy(struct ttm_buffer_object *tbo)
{
        struct amdgpu_device *adev = amdgpu_ttm_adev(tbo->bdev);
        struct amdgpu_bo *bo = ttm_to_amdgpu_bo(tbo);

        if (bo->pin_count > 0)
                amdgpu_bo_subtract_pin_size(bo);

        if (bo->kfd_bo)
                amdgpu_amdkfd_unreserve_memory_limit(bo);

        amdgpu_bo_kunmap(bo);

        if (bo->gem_base.import_attach)
                drm_prime_gem_destroy(&bo->gem_base, bo->tbo.sg);
        drm_gem_object_release(&bo->gem_base);
        amdgpu_bo_unref(&bo->parent);
        if (!list_empty(&bo->shadow_list)) {
                mutex_lock(&adev->shadow_list_lock);
                list_del_init(&bo->shadow_list);
                mutex_unlock(&adev->shadow_list_lock);
        }
        kfree(bo->metadata);
        kfree(bo);
}

/**
 * amdgpu_bo_is_amdgpu_bo - check if the buffer object is an &amdgpu_bo
 * @bo: buffer object to be checked
 *
 * Uses destroy function associated with the object to determine if this is
 * an &amdgpu_bo.
 *
 * Returns:
 * true if the object belongs to &amdgpu_bo, false if not.
 */
bool amdgpu_bo_is_amdgpu_bo(struct ttm_buffer_object *bo)
{
        if (bo->destroy == &amdgpu_bo_destroy)
                return true;
        return false;
}

/**
 * amdgpu_bo_placement_from_domain - set buffer's placement
 * @abo: &amdgpu_bo buffer object whose placement is to be set
 * @domain: requested domain
 *
 * Sets buffer's placement according to requested domain and the buffer's
 * flags.
 */
void amdgpu_bo_placement_from_domain(struct amdgpu_bo *abo, u32 domain)
{
        struct amdgpu_device *adev = amdgpu_ttm_adev(abo->tbo.bdev);
        struct ttm_placement *placement = &abo->placement;
        struct ttm_place *places = abo->placements;
        u64 flags = abo->flags;
        u32 c = 0;

        if (domain & AMDGPU_GEM_DOMAIN_VRAM) {
                unsigned visible_pfn = adev->gmc.visible_vram_size >> PAGE_SHIFT;

                places[c].fpfn = 0;
                places[c].lpfn = 0;
                places[c].flags = TTM_PL_FLAG_WC | TTM_PL_FLAG_UNCACHED |
                        TTM_PL_FLAG_VRAM;

                if (flags & AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED)
                        places[c].lpfn = visible_pfn;
                else
                        places[c].flags |= TTM_PL_FLAG_TOPDOWN;

                if (flags & AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS)
                        places[c].flags |= TTM_PL_FLAG_CONTIGUOUS;
                c++;
        }

        if (domain & AMDGPU_GEM_DOMAIN_GTT) {
                places[c].fpfn = 0;
                places[c].lpfn = 0;
                places[c].flags = TTM_PL_FLAG_TT;
                if (flags & AMDGPU_GEM_CREATE_CPU_GTT_USWC)
                        places[c].flags |= TTM_PL_FLAG_WC |
                                TTM_PL_FLAG_UNCACHED;
                else
                        places[c].flags |= TTM_PL_FLAG_CACHED;
                c++;
        }

        if (domain & AMDGPU_GEM_DOMAIN_CPU) {
                places[c].fpfn = 0;
                places[c].lpfn = 0;
                places[c].flags = TTM_PL_FLAG_SYSTEM;
                if (flags & AMDGPU_GEM_CREATE_CPU_GTT_USWC)
                        places[c].flags |= TTM_PL_FLAG_WC |
                                TTM_PL_FLAG_UNCACHED;
                else
                        places[c].flags |= TTM_PL_FLAG_CACHED;
                c++;
        }

        if (domain & AMDGPU_GEM_DOMAIN_GDS) {
                places[c].fpfn = 0;
                places[c].lpfn = 0;
                places[c].flags = TTM_PL_FLAG_UNCACHED | AMDGPU_PL_FLAG_GDS;
                c++;
        }

        if (domain & AMDGPU_GEM_DOMAIN_GWS) {
                places[c].fpfn = 0;
                places[c].lpfn = 0;
                places[c].flags = TTM_PL_FLAG_UNCACHED | AMDGPU_PL_FLAG_GWS;
                c++;
        }

        if (domain & AMDGPU_GEM_DOMAIN_OA) {
                places[c].fpfn = 0;
                places[c].lpfn = 0;
                places[c].flags = TTM_PL_FLAG_UNCACHED | AMDGPU_PL_FLAG_OA;
                c++;
        }

        if (!c) {
                places[c].fpfn = 0;
                places[c].lpfn = 0;
                places[c].flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM;
                c++;
        }

        BUG_ON(c >= AMDGPU_BO_MAX_PLACEMENTS);

        placement->num_placement = c;
        placement->placement = places;

        placement->num_busy_placement = c;
        placement->busy_placement = places;
}

/**
 * amdgpu_bo_create_reserved - create reserved BO for kernel use
 *
 * @adev: amdgpu device object
 * @size: size for the new BO
 * @align: alignment for the new BO
 * @domain: where to place it
 * @bo_ptr: used to initialize BOs in structures
 * @gpu_addr: GPU addr of the pinned BO
 * @cpu_addr: optional CPU address mapping
 *
 * Allocates and pins a BO for kernel internal use, and returns it still
 * reserved.
 *
 * Note: For bo_ptr new BO is only created if bo_ptr points to NULL.
 *
 * Returns:
 * 0 on success, negative error code otherwise.
 */
int amdgpu_bo_create_reserved(struct amdgpu_device *adev,
                              unsigned long size, int align,
                              u32 domain, struct amdgpu_bo **bo_ptr,
                              u64 *gpu_addr, void **cpu_addr)
{
        struct amdgpu_bo_param bp;
        bool free = false;
        int r;

        if (!size) {
                amdgpu_bo_unref(bo_ptr);
                return 0;
        }

        memset(&bp, 0, sizeof(bp));
        bp.size = size;
        bp.byte_align = align;
        bp.domain = domain;
        bp.flags = AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED |
                AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS;
        bp.type = ttm_bo_type_kernel;
        bp.resv = NULL;

        if (!*bo_ptr) {
                r = amdgpu_bo_create(adev, &bp, bo_ptr);
                if (r) {
                        dev_err(adev->dev, "(%d) failed to allocate kernel bo\n",
                                r);
                        return r;
                }
                free = true;
        }

        r = amdgpu_bo_reserve(*bo_ptr, false);
        if (r) {
                dev_err(adev->dev, "(%d) failed to reserve kernel bo\n", r);
                goto error_free;
        }

        r = amdgpu_bo_pin(*bo_ptr, domain);
        if (r) {
                dev_err(adev->dev, "(%d) kernel bo pin failed\n", r);
                goto error_unreserve;
        }

        r = amdgpu_ttm_alloc_gart(&(*bo_ptr)->tbo);
        if (r) {
                dev_err(adev->dev, "%p bind failed\n", *bo_ptr);
                goto error_unpin;
        }

        if (gpu_addr)
                *gpu_addr = amdgpu_bo_gpu_offset(*bo_ptr);

        if (cpu_addr) {
                r = amdgpu_bo_kmap(*bo_ptr, cpu_addr);
                if (r) {
                        dev_err(adev->dev, "(%d) kernel bo map failed\n", r);
                        goto error_unpin;
                }
        }

        return 0;

error_unpin:
        amdgpu_bo_unpin(*bo_ptr);
error_unreserve:
        amdgpu_bo_unreserve(*bo_ptr);

error_free:
        if (free)
                amdgpu_bo_unref(bo_ptr);

        return r;
}

/**
 * amdgpu_bo_create_kernel - create BO for kernel use
 *
 * @adev: amdgpu device object
 * @size: size for the new BO
 * @align: alignment for the new BO
 * @domain: where to place it
 * @bo_ptr:  used to initialize BOs in structures
 * @gpu_addr: GPU addr of the pinned BO
 * @cpu_addr: optional CPU address mapping
 *
 * Allocates and pins a BO for kernel internal use.
 *
 * Note: For bo_ptr new BO is only created if bo_ptr points to NULL.
 *
 * Returns:
 * 0 on success, negative error code otherwise.
 */
int amdgpu_bo_create_kernel(struct amdgpu_device *adev,
                            unsigned long size, int align,
                            u32 domain, struct amdgpu_bo **bo_ptr,
                            u64 *gpu_addr, void **cpu_addr)
{
        int r;

        r = amdgpu_bo_create_reserved(adev, size, align, domain, bo_ptr,
                                      gpu_addr, cpu_addr);

        if (r)
                return r;

        if (*bo_ptr)
                amdgpu_bo_unreserve(*bo_ptr);

        return 0;
}

/**
 * amdgpu_bo_free_kernel - free BO for kernel use
 *
 * @bo: amdgpu BO to free
 * @gpu_addr: pointer to where the BO's GPU memory space address was stored
 * @cpu_addr: pointer to where the BO's CPU memory space address was stored
 *
 * unmaps and unpin a BO for kernel internal use.
 */
void amdgpu_bo_free_kernel(struct amdgpu_bo **bo, u64 *gpu_addr,
                           void **cpu_addr)
{
        if (*bo == NULL)
                return;

        if (likely(amdgpu_bo_reserve(*bo, true) == 0)) {
                if (cpu_addr)
                        amdgpu_bo_kunmap(*bo);

                amdgpu_bo_unpin(*bo);
                amdgpu_bo_unreserve(*bo);
        }
        amdgpu_bo_unref(bo);

        if (gpu_addr)
                *gpu_addr = 0;

        if (cpu_addr)
                *cpu_addr = NULL;
}

/* Validate bo size is bit bigger then the request domain */
static bool amdgpu_bo_validate_size(struct amdgpu_device *adev,
                                          unsigned long size, u32 domain)
{
        struct ttm_mem_type_manager *man = NULL;

        /*
         * If GTT is part of requested domains the check must succeed to
         * allow fall back to GTT
         */
        if (domain & AMDGPU_GEM_DOMAIN_GTT) {
                man = &adev->mman.bdev.man[TTM_PL_TT];

                if (size < (man->size << PAGE_SHIFT))
                        return true;
                else
                        goto fail;
        }

        if (domain & AMDGPU_GEM_DOMAIN_VRAM) {
                man = &adev->mman.bdev.man[TTM_PL_VRAM];

                if (size < (man->size << PAGE_SHIFT))
                        return true;
                else
                        goto fail;
        }


        /* TODO add more domains checks, such as AMDGPU_GEM_DOMAIN_CPU */
        return true;

fail:
        DRM_DEBUG("BO size %lu > total memory in domain: %llu\n", size,
                  man->size << PAGE_SHIFT);
        return false;
}

static int amdgpu_bo_do_create(struct amdgpu_device *adev,
                               struct amdgpu_bo_param *bp,
                               struct amdgpu_bo **bo_ptr)
{
        struct ttm_operation_ctx ctx = {
                .interruptible = (bp->type != ttm_bo_type_kernel),
                .no_wait_gpu = false,
                .resv = bp->resv,
                .flags = TTM_OPT_FLAG_ALLOW_RES_EVICT
        };
        struct amdgpu_bo *bo;
        unsigned long page_align, size = bp->size;
        size_t acc_size;
        int r;

        /* Note that GDS/GWS/OA allocates 1 page per byte/resource. */
        if (bp->domain & (AMDGPU_GEM_DOMAIN_GWS | AMDGPU_GEM_DOMAIN_OA)) {
                /* GWS and OA don't need any alignment. */
                page_align = bp->byte_align;
                size <<= PAGE_SHIFT;
        } else if (bp->domain & AMDGPU_GEM_DOMAIN_GDS) {
                /* Both size and alignment must be a multiple of 4. */
                page_align = ALIGN(bp->byte_align, 4);
                size = ALIGN(size, 4) << PAGE_SHIFT;
        } else {
                /* Memory should be aligned at least to a page size. */
                page_align = ALIGN(bp->byte_align, PAGE_SIZE) >> PAGE_SHIFT;
                size = ALIGN(size, PAGE_SIZE);
        }

        if (!amdgpu_bo_validate_size(adev, size, bp->domain))
                return -ENOMEM;

        *bo_ptr = NULL;

        acc_size = ttm_bo_dma_acc_size(&adev->mman.bdev, size,
                                       sizeof(struct amdgpu_bo));

        bo = kzalloc(sizeof(struct amdgpu_bo), GFP_KERNEL);
        if (bo == NULL)
                return -ENOMEM;
        drm_gem_private_object_init(adev->ddev, &bo->gem_base, size);
        INIT_LIST_HEAD(&bo->shadow_list);
        bo->vm_bo = NULL;
        bo->preferred_domains = bp->preferred_domain ? bp->preferred_domain :
                bp->domain;
        bo->allowed_domains = bo->preferred_domains;
        if (bp->type != ttm_bo_type_kernel &&
            bo->allowed_domains == AMDGPU_GEM_DOMAIN_VRAM)
                bo->allowed_domains |= AMDGPU_GEM_DOMAIN_GTT;

        bo->flags = bp->flags;

#ifdef CONFIG_X86_32
        /* XXX: Write-combined CPU mappings of GTT seem broken on 32-bit
         * See https://bugs.freedesktop.org/show_bug.cgi?id=84627
         */
        bo->flags &= ~AMDGPU_GEM_CREATE_CPU_GTT_USWC;
#elif defined(CONFIG_X86) && !defined(CONFIG_X86_PAT)
        /* Don't try to enable write-combining when it can't work, or things
         * may be slow
         * See https://bugs.freedesktop.org/show_bug.cgi?id=88758
         */

#ifndef CONFIG_COMPILE_TEST
#warning Please enable CONFIG_MTRR and CONFIG_X86_PAT for better performance \
         thanks to write-combining
#endif

        if (bo->flags & AMDGPU_GEM_CREATE_CPU_GTT_USWC)
                DRM_INFO_ONCE("Please enable CONFIG_MTRR and CONFIG_X86_PAT for "
                              "better performance thanks to write-combining\n");
        bo->flags &= ~AMDGPU_GEM_CREATE_CPU_GTT_USWC;
#else
        /* For architectures that don't support WC memory,
         * mask out the WC flag from the BO
         */
        if (!drm_arch_can_wc_memory())
                bo->flags &= ~AMDGPU_GEM_CREATE_CPU_GTT_USWC;
#endif

        bo->tbo.bdev = &adev->mman.bdev;
        amdgpu_bo_placement_from_domain(bo, bp->domain);
        if (bp->type == ttm_bo_type_kernel)
                bo->tbo.priority = 1;

        r = ttm_bo_init_reserved(&adev->mman.bdev, &bo->tbo, size, bp->type,
                                 &bo->placement, page_align, &ctx, acc_size,
                                 NULL, bp->resv, &amdgpu_bo_destroy);
        if (unlikely(r != 0))
                return r;

        if (!amdgpu_gmc_vram_full_visible(&adev->gmc) &&
            bo->tbo.mem.mem_type == TTM_PL_VRAM &&
            bo->tbo.mem.start < adev->gmc.visible_vram_size >> PAGE_SHIFT)
                amdgpu_cs_report_moved_bytes(adev, ctx.bytes_moved,
                                             ctx.bytes_moved);
        else
                amdgpu_cs_report_moved_bytes(adev, ctx.bytes_moved, 0);

        if (bp->flags & AMDGPU_GEM_CREATE_VRAM_CLEARED &&
            bo->tbo.mem.placement & TTM_PL_FLAG_VRAM) {
                struct dma_fence *fence;

                r = amdgpu_fill_buffer(bo, 0, bo->tbo.resv, &fence);
                if (unlikely(r))
                        goto fail_unreserve;

                amdgpu_bo_fence(bo, fence, false);
                dma_fence_put(bo->tbo.moving);
                bo->tbo.moving = dma_fence_get(fence);
                dma_fence_put(fence);
        }
        if (!bp->resv)
                amdgpu_bo_unreserve(bo);
        *bo_ptr = bo;

        trace_amdgpu_bo_create(bo);

        /* Treat CPU_ACCESS_REQUIRED only as a hint if given by UMD */
        if (bp->type == ttm_bo_type_device)
                bo->flags &= ~AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED;

        return 0;

fail_unreserve:
        if (!bp->resv)
                ww_mutex_unlock(&bo->tbo.resv->lock);
        amdgpu_bo_unref(&bo);
        return r;
}

static int amdgpu_bo_create_shadow(struct amdgpu_device *adev,
                                   unsigned long size,
                                   struct amdgpu_bo *bo)
{
        struct amdgpu_bo_param bp;
        int r;

        if (bo->shadow)
                return 0;

        memset(&bp, 0, sizeof(bp));
        bp.size = size;
        bp.domain = AMDGPU_GEM_DOMAIN_GTT;
        bp.flags = AMDGPU_GEM_CREATE_CPU_GTT_USWC |
                AMDGPU_GEM_CREATE_SHADOW;
        bp.type = ttm_bo_type_kernel;
        bp.resv = bo->tbo.resv;

        r = amdgpu_bo_do_create(adev, &bp, &bo->shadow);
        if (!r) {
                bo->shadow->parent = amdgpu_bo_ref(bo);
                mutex_lock(&adev->shadow_list_lock);
                list_add_tail(&bo->shadow->shadow_list, &adev->shadow_list);
                mutex_unlock(&adev->shadow_list_lock);
        }

        return r;
}

/**
 * amdgpu_bo_create - create an &amdgpu_bo buffer object
 * @adev: amdgpu device object
 * @bp: parameters to be used for the buffer object
 * @bo_ptr: pointer to the buffer object pointer
 *
 * Creates an &amdgpu_bo buffer object; and if requested, also creates a
 * shadow object.
 * Shadow object is used to backup the original buffer object, and is always
 * in GTT.
 *
 * Returns:
 * 0 for success or a negative error code on failure.
 */
int amdgpu_bo_create(struct amdgpu_device *adev,
                     struct amdgpu_bo_param *bp,
                     struct amdgpu_bo **bo_ptr)
{
        u64 flags = bp->flags;
        int r;

        bp->flags = bp->flags & ~AMDGPU_GEM_CREATE_SHADOW;
        r = amdgpu_bo_do_create(adev, bp, bo_ptr);
        if (r)
                return r;

        if ((flags & AMDGPU_GEM_CREATE_SHADOW) && !(adev->flags & AMD_IS_APU)) {
                if (!bp->resv)
                        WARN_ON(reservation_object_lock((*bo_ptr)->tbo.resv,
                                                        NULL));

                r = amdgpu_bo_create_shadow(adev, bp->size, *bo_ptr);

                if (!bp->resv)
                        reservation_object_unlock((*bo_ptr)->tbo.resv);

                if (r)
                        amdgpu_bo_unref(bo_ptr);
        }

        return r;
}

/**
 * amdgpu_bo_validate - validate an &amdgpu_bo buffer object
 * @bo: pointer to the buffer object
 *
 * Sets placement according to domain; and changes placement and caching
 * policy of the buffer object according to the placement.
 * This is used for validating shadow bos.  It calls ttm_bo_validate() to
 * make sure the buffer is resident where it needs to be.
 *
 * Returns:
 * 0 for success or a negative error code on failure.
 */
int amdgpu_bo_validate(struct amdgpu_bo *bo)
{
        struct ttm_operation_ctx ctx = { false, false };
        uint32_t domain;
        int r;

        if (bo->pin_count)
                return 0;

        domain = bo->preferred_domains;

retry:
        amdgpu_bo_placement_from_domain(bo, domain);
        r = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
        if (unlikely(r == -ENOMEM) && domain != bo->allowed_domains) {
                domain = bo->allowed_domains;
                goto retry;
        }

        return r;
}

/**
 * amdgpu_bo_restore_shadow - restore an &amdgpu_bo shadow
 *
 * @shadow: &amdgpu_bo shadow to be restored
 * @fence: dma_fence associated with the operation
 *
 * Copies a buffer object's shadow content back to the object.
 * This is used for recovering a buffer from its shadow in case of a gpu
 * reset where vram context may be lost.
 *
 * Returns:
 * 0 for success or a negative error code on failure.
 */
int amdgpu_bo_restore_shadow(struct amdgpu_bo *shadow, struct dma_fence **fence)

{
        struct amdgpu_device *adev = amdgpu_ttm_adev(shadow->tbo.bdev);
        struct amdgpu_ring *ring = adev->mman.buffer_funcs_ring;
        uint64_t shadow_addr, parent_addr;

        shadow_addr = amdgpu_bo_gpu_offset(shadow);
        parent_addr = amdgpu_bo_gpu_offset(shadow->parent);

        return amdgpu_copy_buffer(ring, shadow_addr, parent_addr,
                                  amdgpu_bo_size(shadow), NULL, fence,
                                  true, false);
}

/**
 * amdgpu_bo_kmap - map an &amdgpu_bo buffer object
 * @bo: &amdgpu_bo buffer object to be mapped
 * @ptr: kernel virtual address to be returned
 *
 * Calls ttm_bo_kmap() to set up the kernel virtual mapping; calls
 * amdgpu_bo_kptr() to get the kernel virtual address.
 *
 * Returns:
 * 0 for success or a negative error code on failure.
 */
int amdgpu_bo_kmap(struct amdgpu_bo *bo, void **ptr)
{
        void *kptr;
        long r;

        if (bo->flags & AMDGPU_GEM_CREATE_NO_CPU_ACCESS)
                return -EPERM;

        kptr = amdgpu_bo_kptr(bo);
        if (kptr) {
                if (ptr)
                        *ptr = kptr;
                return 0;
        }

        r = reservation_object_wait_timeout_rcu(bo->tbo.resv, false, false,
                                                MAX_SCHEDULE_TIMEOUT);
        if (r < 0)
                return r;

        r = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, &bo->kmap);
        if (r)
                return r;

        if (ptr)
                *ptr = amdgpu_bo_kptr(bo);

        return 0;
}

/**
 * amdgpu_bo_kptr - returns a kernel virtual address of the buffer object
 * @bo: &amdgpu_bo buffer object
 *
 * Calls ttm_kmap_obj_virtual() to get the kernel virtual address
 *
 * Returns:
 * the virtual address of a buffer object area.
 */
void *amdgpu_bo_kptr(struct amdgpu_bo *bo)
{
        bool is_iomem;

        return ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
}

/**
 * amdgpu_bo_kunmap - unmap an &amdgpu_bo buffer object
 * @bo: &amdgpu_bo buffer object to be unmapped
 *
 * Unmaps a kernel map set up by amdgpu_bo_kmap().
 */
void amdgpu_bo_kunmap(struct amdgpu_bo *bo)
{
        if (bo->kmap.bo)
                ttm_bo_kunmap(&bo->kmap);
}

/**
 * amdgpu_bo_ref - reference an &amdgpu_bo buffer object
 * @bo: &amdgpu_bo buffer object
 *
 * References the contained &ttm_buffer_object.
 *
 * Returns:
 * a refcounted pointer to the &amdgpu_bo buffer object.
 */
struct amdgpu_bo *amdgpu_bo_ref(struct amdgpu_bo *bo)
{
        if (bo == NULL)
                return NULL;

        ttm_bo_get(&bo->tbo);
        return bo;
}

/**
 * amdgpu_bo_unref - unreference an &amdgpu_bo buffer object
 * @bo: &amdgpu_bo buffer object
 *
 * Unreferences the contained &ttm_buffer_object and clear the pointer
 */
void amdgpu_bo_unref(struct amdgpu_bo **bo)
{
        struct ttm_buffer_object *tbo;

        if ((*bo) == NULL)
                return;

        tbo = &((*bo)->tbo);
        ttm_bo_put(tbo);
        *bo = NULL;
}

/**
 * amdgpu_bo_pin_restricted - pin an &amdgpu_bo buffer object
 * @bo: &amdgpu_bo buffer object to be pinned
 * @domain: domain to be pinned to
 * @min_offset: the start of requested address range
 * @max_offset: the end of requested address range
 *
 * Pins the buffer object according to requested domain and address range. If
 * the memory is unbound gart memory, binds the pages into gart table. Adjusts
 * pin_count and pin_size accordingly.
 *
 * Pinning means to lock pages in memory along with keeping them at a fixed
 * offset. It is required when a buffer can not be moved, for example, when
 * a display buffer is being scanned out.
 *
 * Compared with amdgpu_bo_pin(), this function gives more flexibility on
 * where to pin a buffer if there are specific restrictions on where a buffer
 * must be located.
 *
 * Returns:
 * 0 for success or a negative error code on failure.
 */
int amdgpu_bo_pin_restricted(struct amdgpu_bo *bo, u32 domain,
                             u64 min_offset, u64 max_offset)
{
        struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
        struct ttm_operation_ctx ctx = { false, false };
        int r, i;

        if (amdgpu_ttm_tt_get_usermm(bo->tbo.ttm))
                return -EPERM;

        if (WARN_ON_ONCE(min_offset > max_offset))
                return -EINVAL;

        /* A shared bo cannot be migrated to VRAM */
        if (bo->prime_shared_count) {
                if (domain & AMDGPU_GEM_DOMAIN_GTT)
                        domain = AMDGPU_GEM_DOMAIN_GTT;
                else
                        return -EINVAL;
        }

        /* This assumes only APU display buffers are pinned with (VRAM|GTT).
         * See function amdgpu_display_supported_domains()
         */
        domain = amdgpu_bo_get_preferred_pin_domain(adev, domain);

        if (bo->pin_count) {
                uint32_t mem_type = bo->tbo.mem.mem_type;

                if (!(domain & amdgpu_mem_type_to_domain(mem_type)))
                        return -EINVAL;

                bo->pin_count++;

                if (max_offset != 0) {
                        u64 domain_start = bo->tbo.bdev->man[mem_type].gpu_offset;
                        WARN_ON_ONCE(max_offset <
                                     (amdgpu_bo_gpu_offset(bo) - domain_start));
                }

                return 0;
        }

        bo->flags |= AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS;
        /* force to pin into visible video ram */
        if (!(bo->flags & AMDGPU_GEM_CREATE_NO_CPU_ACCESS))
                bo->flags |= AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED;
        amdgpu_bo_placement_from_domain(bo, domain);
        for (i = 0; i < bo->placement.num_placement; i++) {
                unsigned fpfn, lpfn;

                fpfn = min_offset >> PAGE_SHIFT;
                lpfn = max_offset >> PAGE_SHIFT;

                if (fpfn > bo->placements[i].fpfn)
                        bo->placements[i].fpfn = fpfn;
                if (!bo->placements[i].lpfn ||
                    (lpfn && lpfn < bo->placements[i].lpfn))
                        bo->placements[i].lpfn = lpfn;
                bo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;
        }

        r = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
        if (unlikely(r)) {
                dev_err(adev->dev, "%p pin failed\n", bo);
                goto error;
        }

        bo->pin_count = 1;

        domain = amdgpu_mem_type_to_domain(bo->tbo.mem.mem_type);
        if (domain == AMDGPU_GEM_DOMAIN_VRAM) {
                atomic64_add(amdgpu_bo_size(bo), &adev->vram_pin_size);
                atomic64_add(amdgpu_vram_mgr_bo_visible_size(bo),
                             &adev->visible_pin_size);
        } else if (domain == AMDGPU_GEM_DOMAIN_GTT) {
                atomic64_add(amdgpu_bo_size(bo), &adev->gart_pin_size);
        }

error:
        return r;
}

/**
 * amdgpu_bo_pin - pin an &amdgpu_bo buffer object
 * @bo: &amdgpu_bo buffer object to be pinned
 * @domain: domain to be pinned to
 *
 * A simple wrapper to amdgpu_bo_pin_restricted().
 * Provides a simpler API for buffers that do not have any strict restrictions
 * on where a buffer must be located.
 *
 * Returns:
 * 0 for success or a negative error code on failure.
 */
int amdgpu_bo_pin(struct amdgpu_bo *bo, u32 domain)
{
        return amdgpu_bo_pin_restricted(bo, domain, 0, 0);
}

/**
 * amdgpu_bo_unpin - unpin an &amdgpu_bo buffer object
 * @bo: &amdgpu_bo buffer object to be unpinned
 *
 * Decreases the pin_count, and clears the flags if pin_count reaches 0.
 * Changes placement and pin size accordingly.
 *
 * Returns:
 * 0 for success or a negative error code on failure.
 */
int amdgpu_bo_unpin(struct amdgpu_bo *bo)
{
        struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
        struct ttm_operation_ctx ctx = { false, false };
        int r, i;

        if (WARN_ON_ONCE(!bo->pin_count)) {
                dev_warn(adev->dev, "%p unpin not necessary\n", bo);
                return 0;
        }
        bo->pin_count--;
        if (bo->pin_count)
                return 0;

        amdgpu_bo_subtract_pin_size(bo);

        for (i = 0; i < bo->placement.num_placement; i++) {
                bo->placements[i].lpfn = 0;
                bo->placements[i].flags &= ~TTM_PL_FLAG_NO_EVICT;
        }
        r = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
        if (unlikely(r))
                dev_err(adev->dev, "%p validate failed for unpin\n", bo);

        return r;
}

/**
 * amdgpu_bo_evict_vram - evict VRAM buffers
 * @adev: amdgpu device object
 *
 * Evicts all VRAM buffers on the lru list of the memory type.
 * Mainly used for evicting vram at suspend time.
 *
 * Returns:
 * 0 for success or a negative error code on failure.
 */
int amdgpu_bo_evict_vram(struct amdgpu_device *adev)
{
        /* late 2.6.33 fix IGP hibernate - we need pm ops to do this correct */
#ifndef CONFIG_HIBERNATION
        if (adev->flags & AMD_IS_APU) {
                /* Useless to evict on IGP chips */
                return 0;
        }
#endif
        return ttm_bo_evict_mm(&adev->mman.bdev, TTM_PL_VRAM);
}

static const char *amdgpu_vram_names[] = {
        "UNKNOWN",
        "GDDR1",
        "DDR2",
        "GDDR3",
        "GDDR4",
        "GDDR5",
        "HBM",
        "DDR3",
        "DDR4",
};

/**
 * amdgpu_bo_init - initialize memory manager
 * @adev: amdgpu device object
 *
 * Calls amdgpu_ttm_init() to initialize amdgpu memory manager.
 *
 * Returns:
 * 0 for success or a negative error code on failure.
 */
int amdgpu_bo_init(struct amdgpu_device *adev)
{
        /* reserve PAT memory space to WC for VRAM */
        arch_io_reserve_memtype_wc(adev->gmc.aper_base,
                                   adev->gmc.aper_size);

        /* Add an MTRR for the VRAM */
        adev->gmc.vram_mtrr = arch_phys_wc_add(adev->gmc.aper_base,
                                              adev->gmc.aper_size);
        DRM_INFO("Detected VRAM RAM=%lluM, BAR=%lluM\n",
                 adev->gmc.mc_vram_size >> 20,
                 (unsigned long long)adev->gmc.aper_size >> 20);
        DRM_INFO("RAM width %dbits %s\n",
                 adev->gmc.vram_width, amdgpu_vram_names[adev->gmc.vram_type]);

        return amdgpu_ttm_init(adev);
}

/**
 * amdgpu_bo_late_init - late init
 * @adev: amdgpu device object
 *
 * Calls amdgpu_ttm_late_init() to free resources used earlier during
 * initialization.
 *
 * Returns:
 * 0 for success or a negative error code on failure.
 */
int amdgpu_bo_late_init(struct amdgpu_device *adev)
{
        amdgpu_ttm_late_init(adev);

        return 0;
}

/**
 * amdgpu_bo_fini - tear down memory manager
 * @adev: amdgpu device object
 *
 * Reverses amdgpu_bo_init() to tear down memory manager.
 */
void amdgpu_bo_fini(struct amdgpu_device *adev)
{
        amdgpu_ttm_fini(adev);
        arch_phys_wc_del(adev->gmc.vram_mtrr);
        arch_io_free_memtype_wc(adev->gmc.aper_base, adev->gmc.aper_size);
}

/**
 * amdgpu_bo_fbdev_mmap - mmap fbdev memory
 * @bo: &amdgpu_bo buffer object
 * @vma: vma as input from the fbdev mmap method
 *
 * Calls ttm_fbdev_mmap() to mmap fbdev memory if it is backed by a bo.
 *
 * Returns:
 * 0 for success or a negative error code on failure.
 */
int amdgpu_bo_fbdev_mmap(struct amdgpu_bo *bo,
                             struct vm_area_struct *vma)
{
        return ttm_fbdev_mmap(vma, &bo->tbo);
}

/**
 * amdgpu_bo_set_tiling_flags - set tiling flags
 * @bo: &amdgpu_bo buffer object
 * @tiling_flags: new flags
 *
 * Sets buffer object's tiling flags with the new one. Used by GEM ioctl or
 * kernel driver to set the tiling flags on a buffer.
 *
 * Returns:
 * 0 for success or a negative error code on failure.
 */
int amdgpu_bo_set_tiling_flags(struct amdgpu_bo *bo, u64 tiling_flags)
{
        struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);

        if (adev->family <= AMDGPU_FAMILY_CZ &&
            AMDGPU_TILING_GET(tiling_flags, TILE_SPLIT) > 6)
                return -EINVAL;

        bo->tiling_flags = tiling_flags;
        return 0;
}

/**
 * amdgpu_bo_get_tiling_flags - get tiling flags
 * @bo: &amdgpu_bo buffer object
 * @tiling_flags: returned flags
 *
 * Gets buffer object's tiling flags. Used by GEM ioctl or kernel driver to
 * set the tiling flags on a buffer.
 */
void amdgpu_bo_get_tiling_flags(struct amdgpu_bo *bo, u64 *tiling_flags)
{
        lockdep_assert_held(&bo->tbo.resv->lock.base);

        if (tiling_flags)
                *tiling_flags = bo->tiling_flags;
}

/**
 * amdgpu_bo_set_metadata - set metadata
 * @bo: &amdgpu_bo buffer object
 * @metadata: new metadata
 * @metadata_size: size of the new metadata
 * @flags: flags of the new metadata
 *
 * Sets buffer object's metadata, its size and flags.
 * Used via GEM ioctl.
 *
 * Returns:
 * 0 for success or a negative error code on failure.
 */
int amdgpu_bo_set_metadata (struct amdgpu_bo *bo, void *metadata,
                            uint32_t metadata_size, uint64_t flags)
{
        void *buffer;

        if (!metadata_size) {
                if (bo->metadata_size) {
                        kfree(bo->metadata);
                        bo->metadata = NULL;
                        bo->metadata_size = 0;
                }
                return 0;
        }

        if (metadata == NULL)
                return -EINVAL;

        buffer = kmemdup(metadata, metadata_size, GFP_KERNEL);
        if (buffer == NULL)
                return -ENOMEM;

        kfree(bo->metadata);
        bo->metadata_flags = flags;
        bo->metadata = buffer;
        bo->metadata_size = metadata_size;

        return 0;
}

/**
 * amdgpu_bo_get_metadata - get metadata
 * @bo: &amdgpu_bo buffer object
 * @buffer: returned metadata
 * @buffer_size: size of the buffer
 * @metadata_size: size of the returned metadata
 * @flags: flags of the returned metadata
 *
 * Gets buffer object's metadata, its size and flags. buffer_size shall not be
 * less than metadata_size.
 * Used via GEM ioctl.
 *
 * Returns:
 * 0 for success or a negative error code on failure.
 */
int amdgpu_bo_get_metadata(struct amdgpu_bo *bo, void *buffer,
                           size_t buffer_size, uint32_t *metadata_size,
                           uint64_t *flags)
{
        if (!buffer && !metadata_size)
                return -EINVAL;

        if (buffer) {
                if (buffer_size < bo->metadata_size)
                        return -EINVAL;

                if (bo->metadata_size)
                        memcpy(buffer, bo->metadata, bo->metadata_size);
        }

        if (metadata_size)
                *metadata_size = bo->metadata_size;
        if (flags)
                *flags = bo->metadata_flags;

        return 0;
}

/**
 * amdgpu_bo_move_notify - notification about a memory move
 * @bo: pointer to a buffer object
 * @evict: if this move is evicting the buffer from the graphics address space
 * @new_mem: new information of the bufer object
 *
 * Marks the corresponding &amdgpu_bo buffer object as invalid, also performs
 * bookkeeping.
 * TTM driver callback which is called when ttm moves a buffer.
 */
void amdgpu_bo_move_notify(struct ttm_buffer_object *bo,
                           bool evict,
                           struct ttm_mem_reg *new_mem)
{
        struct amdgpu_device *adev = amdgpu_ttm_adev(bo->bdev);
        struct amdgpu_bo *abo;
        struct ttm_mem_reg *old_mem = &bo->mem;

        if (!amdgpu_bo_is_amdgpu_bo(bo))
                return;

        abo = ttm_to_amdgpu_bo(bo);
        amdgpu_vm_bo_invalidate(adev, abo, evict);

        amdgpu_bo_kunmap(abo);

        /* remember the eviction */
        if (evict)
                atomic64_inc(&adev->num_evictions);

        /* update statistics */
        if (!new_mem)
                return;

        /* move_notify is called before move happens */
        trace_amdgpu_bo_move(abo, new_mem->mem_type, old_mem->mem_type);
}

/**
 * amdgpu_bo_fault_reserve_notify - notification about a memory fault
 * @bo: pointer to a buffer object
 *
 * Notifies the driver we are taking a fault on this BO and have reserved it,
 * also performs bookkeeping.
 * TTM driver callback for dealing with vm faults.
 *
 * Returns:
 * 0 for success or a negative error code on failure.
 */
int amdgpu_bo_fault_reserve_notify(struct ttm_buffer_object *bo)
{
        struct amdgpu_device *adev = amdgpu_ttm_adev(bo->bdev);
        struct ttm_operation_ctx ctx = { false, false };
        struct amdgpu_bo *abo;
        unsigned long offset, size;
        int r;

        if (!amdgpu_bo_is_amdgpu_bo(bo))
                return 0;

        abo = ttm_to_amdgpu_bo(bo);

        /* Remember that this BO was accessed by the CPU */
        abo->flags |= AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED;

        if (bo->mem.mem_type != TTM_PL_VRAM)
                return 0;

        size = bo->mem.num_pages << PAGE_SHIFT;
        offset = bo->mem.start << PAGE_SHIFT;
        if ((offset + size) <= adev->gmc.visible_vram_size)
                return 0;

        /* Can't move a pinned BO to visible VRAM */
        if (abo->pin_count > 0)
                return -EINVAL;

        /* hurrah the memory is not visible ! */
        atomic64_inc(&adev->num_vram_cpu_page_faults);
        amdgpu_bo_placement_from_domain(abo, AMDGPU_GEM_DOMAIN_VRAM |
                                        AMDGPU_GEM_DOMAIN_GTT);

        /* Avoid costly evictions; only set GTT as a busy placement */
        abo->placement.num_busy_placement = 1;
        abo->placement.busy_placement = &abo->placements[1];

        r = ttm_bo_validate(bo, &abo->placement, &ctx);
        if (unlikely(r != 0))
                return r;

        offset = bo->mem.start << PAGE_SHIFT;
        /* this should never happen */
        if (bo->mem.mem_type == TTM_PL_VRAM &&
            (offset + size) > adev->gmc.visible_vram_size)
                return -EINVAL;

        return 0;
}

/**
 * amdgpu_bo_fence - add fence to buffer object
 *
 * @bo: buffer object in question
 * @fence: fence to add
 * @shared: true if fence should be added shared
 *
 */
void amdgpu_bo_fence(struct amdgpu_bo *bo, struct dma_fence *fence,
                     bool shared)
{
        struct reservation_object *resv = bo->tbo.resv;

        if (shared)
                reservation_object_add_shared_fence(resv, fence);
        else
                reservation_object_add_excl_fence(resv, fence);
}

/**
 * amdgpu_sync_wait_resv - Wait for BO reservation fences
 *
 * @bo: buffer object
 * @owner: fence owner
 * @intr: Whether the wait is interruptible
 *
 * Returns:
 * 0 on success, errno otherwise.
 */
int amdgpu_bo_sync_wait(struct amdgpu_bo *bo, void *owner, bool intr)
{
        struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
        struct amdgpu_sync sync;
        int r;

        amdgpu_sync_create(&sync);
        amdgpu_sync_resv(adev, &sync, bo->tbo.resv, owner, false);
        r = amdgpu_sync_wait(&sync, intr);
        amdgpu_sync_free(&sync);

        return r;
}

/**
 * amdgpu_bo_gpu_offset - return GPU offset of bo
 * @bo: amdgpu object for which we query the offset
 *
 * Note: object should either be pinned or reserved when calling this
 * function, it might be useful to add check for this for debugging.
 *
 * Returns:
 * current GPU offset of the object.
 */
u64 amdgpu_bo_gpu_offset(struct amdgpu_bo *bo)
{
        WARN_ON_ONCE(bo->tbo.mem.mem_type == TTM_PL_SYSTEM);
        WARN_ON_ONCE(!ww_mutex_is_locked(&bo->tbo.resv->lock) &&
                     !bo->pin_count && bo->tbo.type != ttm_bo_type_kernel);
        WARN_ON_ONCE(bo->tbo.mem.start == AMDGPU_BO_INVALID_OFFSET);
        WARN_ON_ONCE(bo->tbo.mem.mem_type == TTM_PL_VRAM &&
                     !(bo->flags & AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS));

        return amdgpu_gmc_sign_extend(bo->tbo.offset);
}

/**
 * amdgpu_bo_get_preferred_pin_domain - get preferred domain for scanout
 * @adev: amdgpu device object
 * @domain: allowed :ref:`memory domains <amdgpu_memory_domains>`
 *
 * Returns:
 * Which of the allowed domains is preferred for pinning the BO for scanout.
 */
uint32_t amdgpu_bo_get_preferred_pin_domain(struct amdgpu_device *adev,
                                            uint32_t domain)
{
        if (domain == (AMDGPU_GEM_DOMAIN_VRAM | AMDGPU_GEM_DOMAIN_GTT)) {
                domain = AMDGPU_GEM_DOMAIN_VRAM;
                if (adev->gmc.real_vram_size <= AMDGPU_SG_THRESHOLD)
                        domain = AMDGPU_GEM_DOMAIN_GTT;
        }
        return domain;
}