cirrus_ttm.c

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/*
 * Copyright 2012 Red Hat Inc.
 *
 * 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: Dave Airlie <[email protected]>
 */
#include <drm/drmP.h>
#include "cirrus_drv.h"
#include <ttm/ttm_page_alloc.h>

static inline struct cirrus_device *
cirrus_bdev(struct ttm_bo_device *bd)
{
    return container_of(bd, struct cirrus_device, ttm.bdev);
}

static int
cirrus_ttm_mem_global_init(struct drm_global_reference *ref)
{
    return ttm_mem_global_init(ref->object);
}

static void
cirrus_ttm_mem_global_release(struct drm_global_reference *ref)
{
    ttm_mem_global_release(ref->object);
}

static int cirrus_ttm_global_init(struct cirrus_device *cirrus)
{
    struct drm_global_reference *global_ref;
    int r;

    global_ref = &cirrus->ttm.mem_global_ref;
    global_ref->global_type = DRM_GLOBAL_TTM_MEM;
    global_ref->size = sizeof(struct ttm_mem_global);
    global_ref->init = &cirrus_ttm_mem_global_init;
    global_ref->release = &cirrus_ttm_mem_global_release;
    r = drm_global_item_ref(global_ref);
    if (r != 0) {
        DRM_ERROR("Failed setting up TTM memory accounting "
              "subsystem.\n");
        return r;
    }

    cirrus->ttm.bo_global_ref.mem_glob =
        cirrus->ttm.mem_global_ref.object;
    global_ref = &cirrus->ttm.bo_global_ref.ref;
    global_ref->global_type = DRM_GLOBAL_TTM_BO;
    global_ref->size = sizeof(struct ttm_bo_global);
    global_ref->init = &ttm_bo_global_init;
    global_ref->release = &ttm_bo_global_release;
    r = drm_global_item_ref(global_ref);
    if (r != 0) {
        DRM_ERROR("Failed setting up TTM BO subsystem.\n");
        drm_global_item_unref(&cirrus->ttm.mem_global_ref);
        return r;
    }
    return 0;
}

void
cirrus_ttm_global_release(struct cirrus_device *cirrus)
{
    if (cirrus->ttm.mem_global_ref.release == NULL)
        return;

    drm_global_item_unref(&cirrus->ttm.bo_global_ref.ref);
    drm_global_item_unref(&cirrus->ttm.mem_global_ref);
    cirrus->ttm.mem_global_ref.release = NULL;
}


static void cirrus_bo_ttm_destroy(struct ttm_buffer_object *tbo)
{
    struct cirrus_bo *bo;

    bo = container_of(tbo, struct cirrus_bo, bo);

    drm_gem_object_release(&bo->gem);
    kfree(bo);
}

bool cirrus_ttm_bo_is_cirrus_bo(struct ttm_buffer_object *bo)
{
    if (bo->destroy == &cirrus_bo_ttm_destroy)
        return true;
    return false;
}

static int
cirrus_bo_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
             struct ttm_mem_type_manager *man)
{
    switch (type) {
    case TTM_PL_SYSTEM:
        man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
        man->available_caching = TTM_PL_MASK_CACHING;
        man->default_caching = TTM_PL_FLAG_CACHED;
        break;
    case TTM_PL_VRAM:
        man->func = &ttm_bo_manager_func;
        man->flags = TTM_MEMTYPE_FLAG_FIXED |
            TTM_MEMTYPE_FLAG_MAPPABLE;
        man->available_caching = TTM_PL_FLAG_UNCACHED |
            TTM_PL_FLAG_WC;
        man->default_caching = TTM_PL_FLAG_WC;
        break;
    default:
        DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
        return -EINVAL;
    }
    return 0;
}

static void
cirrus_bo_evict_flags(struct ttm_buffer_object *bo, struct ttm_placement *pl)
{
    struct cirrus_bo *cirrusbo = cirrus_bo(bo);

    if (!cirrus_ttm_bo_is_cirrus_bo(bo))
        return;

    cirrus_ttm_placement(cirrusbo, TTM_PL_FLAG_SYSTEM);
    *pl = cirrusbo->placement;
}

static int cirrus_bo_verify_access(struct ttm_buffer_object *bo, struct file *filp)
{
    return 0;
}

static int cirrus_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
                  struct ttm_mem_reg *mem)
{
    struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
    struct cirrus_device *cirrus = cirrus_bdev(bdev);

    mem->bus.addr = NULL;
    mem->bus.offset = 0;
    mem->bus.size = mem->num_pages << PAGE_SHIFT;
    mem->bus.base = 0;
    mem->bus.is_iomem = false;
    if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
        return -EINVAL;
    switch (mem->mem_type) {
    case TTM_PL_SYSTEM:
        /* system memory */
        return 0;
    case TTM_PL_VRAM:
        mem->bus.offset = mem->start << PAGE_SHIFT;
        mem->bus.base = pci_resource_start(cirrus->dev->pdev, 0);
        mem->bus.is_iomem = true;
        break;
    default:
        return -EINVAL;
        break;
    }
    return 0;
}

static void cirrus_ttm_io_mem_free(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
{
}

static int cirrus_bo_move(struct ttm_buffer_object *bo,
               bool evict, bool interruptible,
               bool no_wait_reserve, bool no_wait_gpu,
               struct ttm_mem_reg *new_mem)
{
    int r;
    r = ttm_bo_move_memcpy(bo, evict, no_wait_reserve, no_wait_gpu, new_mem);
    return r;
}


static void cirrus_ttm_backend_destroy(struct ttm_tt *tt)
{
    ttm_tt_fini(tt);
    kfree(tt);
}

static struct ttm_backend_func cirrus_tt_backend_func = {
    .destroy = &cirrus_ttm_backend_destroy,
};


struct ttm_tt *cirrus_ttm_tt_create(struct ttm_bo_device *bdev,
                 unsigned long size, uint32_t page_flags,
                 struct page *dummy_read_page)
{
    struct ttm_tt *tt;

    tt = kzalloc(sizeof(struct ttm_tt), GFP_KERNEL);
    if (tt == NULL)
        return NULL;
    tt->func = &cirrus_tt_backend_func;
    if (ttm_tt_init(tt, bdev, size, page_flags, dummy_read_page)) {
        kfree(tt);
        return NULL;
    }
    return tt;
}

static int cirrus_ttm_tt_populate(struct ttm_tt *ttm)
{
    return ttm_pool_populate(ttm);
}

static void cirrus_ttm_tt_unpopulate(struct ttm_tt *ttm)
{
    ttm_pool_unpopulate(ttm);
}

struct ttm_bo_driver cirrus_bo_driver = {
    .ttm_tt_create = cirrus_ttm_tt_create,
    .ttm_tt_populate = cirrus_ttm_tt_populate,
    .ttm_tt_unpopulate = cirrus_ttm_tt_unpopulate,
    .init_mem_type = cirrus_bo_init_mem_type,
    .evict_flags = cirrus_bo_evict_flags,
    .move = cirrus_bo_move,
    .verify_access = cirrus_bo_verify_access,
    .io_mem_reserve = &cirrus_ttm_io_mem_reserve,
    .io_mem_free = &cirrus_ttm_io_mem_free,
};

int cirrus_mm_init(struct cirrus_device *cirrus)
{
    int ret;
    struct drm_device *dev = cirrus->dev;
    struct ttm_bo_device *bdev = &cirrus->ttm.bdev;

    ret = cirrus_ttm_global_init(cirrus);
    if (ret)
        return ret;

    ret = ttm_bo_device_init(&cirrus->ttm.bdev,
                 cirrus->ttm.bo_global_ref.ref.object,
                 &cirrus_bo_driver, DRM_FILE_PAGE_OFFSET,
                 true);
    if (ret) {
        DRM_ERROR("Error initialising bo driver; %d\n", ret);
        return ret;
    }

    ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
                 cirrus->mc.vram_size >> PAGE_SHIFT);
    if (ret) {
        DRM_ERROR("Failed ttm VRAM init: %d\n", ret);
        return ret;
    }

    cirrus->fb_mtrr = drm_mtrr_add(pci_resource_start(dev->pdev, 0),
                    pci_resource_len(dev->pdev, 0),
                    DRM_MTRR_WC);

    cirrus->mm_inited = true;
    return 0;
}

void cirrus_mm_fini(struct cirrus_device *cirrus)
{
    struct drm_device *dev = cirrus->dev;

    if (!cirrus->mm_inited)
        return;

    ttm_bo_device_release(&cirrus->ttm.bdev);

    cirrus_ttm_global_release(cirrus);

    if (cirrus->fb_mtrr >= 0) {
        drm_mtrr_del(cirrus->fb_mtrr,
                 pci_resource_start(dev->pdev, 0),
                 pci_resource_len(dev->pdev, 0), DRM_MTRR_WC);
        cirrus->fb_mtrr = -1;
    }
}

void cirrus_ttm_placement(struct cirrus_bo *bo, int domain)
{
    u32 c = 0;
    bo->placement.fpfn = 0;
    bo->placement.lpfn = 0;
    bo->placement.placement = bo->placements;
    bo->placement.busy_placement = bo->placements;
    if (domain & TTM_PL_FLAG_VRAM)
        bo->placements[c++] = TTM_PL_FLAG_WC | TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_VRAM;
    if (domain & TTM_PL_FLAG_SYSTEM)
        bo->placements[c++] = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM;
    if (!c)
        bo->placements[c++] = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM;
    bo->placement.num_placement = c;
    bo->placement.num_busy_placement = c;
}

int cirrus_bo_reserve(struct cirrus_bo *bo, bool no_wait)
{
    int ret;

    ret = ttm_bo_reserve(&bo->bo, true, no_wait, false, 0);
    if (ret) {
        if (ret != -ERESTARTSYS)
            DRM_ERROR("reserve failed %p\n", bo);
        return ret;
    }
    return 0;
}

void cirrus_bo_unreserve(struct cirrus_bo *bo)
{
    ttm_bo_unreserve(&bo->bo);
}

int cirrus_bo_create(struct drm_device *dev, int size, int align,
          uint32_t flags, struct cirrus_bo **pcirrusbo)
{
    struct cirrus_device *cirrus = dev->dev_private;
    struct cirrus_bo *cirrusbo;
    size_t acc_size;
    int ret;

    cirrusbo = kzalloc(sizeof(struct cirrus_bo), GFP_KERNEL);
    if (!cirrusbo)
        return -ENOMEM;

    ret = drm_gem_object_init(dev, &cirrusbo->gem, size);
    if (ret) {
        kfree(cirrusbo);
        return ret;
    }

    cirrusbo->gem.driver_private = NULL;
    cirrusbo->bo.bdev = &cirrus->ttm.bdev;

    cirrus_ttm_placement(cirrusbo, TTM_PL_FLAG_VRAM | TTM_PL_FLAG_SYSTEM);

    acc_size = ttm_bo_dma_acc_size(&cirrus->ttm.bdev, size,
                       sizeof(struct cirrus_bo));

    ret = ttm_bo_init(&cirrus->ttm.bdev, &cirrusbo->bo, size,
              ttm_bo_type_device, &cirrusbo->placement,
              align >> PAGE_SHIFT, 0, false, NULL, acc_size,
              NULL, cirrus_bo_ttm_destroy);
    if (ret)
        return ret;

    *pcirrusbo = cirrusbo;
    return 0;
}

static inline u64 cirrus_bo_gpu_offset(struct cirrus_bo *bo)
{
    return bo->bo.offset;
}

int cirrus_bo_pin(struct cirrus_bo *bo, u32 pl_flag, u64 *gpu_addr)
{
    int i, ret;

    if (bo->pin_count) {
        bo->pin_count++;
        if (gpu_addr)
            *gpu_addr = cirrus_bo_gpu_offset(bo);
    }

    cirrus_ttm_placement(bo, pl_flag);
    for (i = 0; i < bo->placement.num_placement; i++)
        bo->placements[i] |= TTM_PL_FLAG_NO_EVICT;
    ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false, false);
    if (ret)
        return ret;

    bo->pin_count = 1;
    if (gpu_addr)
        *gpu_addr = cirrus_bo_gpu_offset(bo);
    return 0;
}

int cirrus_bo_unpin(struct cirrus_bo *bo)
{
    int i, ret;
    if (!bo->pin_count) {
        DRM_ERROR("unpin bad %p\n", bo);
        return 0;
    }
    bo->pin_count--;
    if (bo->pin_count)
        return 0;

    for (i = 0; i < bo->placement.num_placement ; i++)
        bo->placements[i] &= ~TTM_PL_FLAG_NO_EVICT;
    ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false, false);
    if (ret)
        return ret;

    return 0;
}

int cirrus_bo_push_sysram(struct cirrus_bo *bo)
{
    int i, ret;
    if (!bo->pin_count) {
        DRM_ERROR("unpin bad %p\n", bo);
        return 0;
    }
    bo->pin_count--;
    if (bo->pin_count)
        return 0;

    if (bo->kmap.virtual)
        ttm_bo_kunmap(&bo->kmap);

    cirrus_ttm_placement(bo, TTM_PL_FLAG_SYSTEM);
    for (i = 0; i < bo->placement.num_placement ; i++)
        bo->placements[i] |= TTM_PL_FLAG_NO_EVICT;

    ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false, false);
    if (ret) {
        DRM_ERROR("pushing to VRAM failed\n");
        return ret;
    }
    return 0;
}

int cirrus_mmap(struct file *filp, struct vm_area_struct *vma)
{
    struct drm_file *file_priv;
    struct cirrus_device *cirrus;

    if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
        return drm_mmap(filp, vma);

    file_priv = filp->private_data;
    cirrus = file_priv->minor->dev->dev_private;
    return ttm_bo_mmap(filp, vma, &cirrus->ttm.bdev);
}