nouveau_sgdma.c

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#include <linux/pagemap.h>
#include <linux/slab.h>

#include <subdev/fb.h>

#include "nouveau_drm.h"
#include "nouveau_ttm.h"

struct nouveau_sgdma_be {
    /* this has to be the first field so populate/unpopulated in
     * nouve_bo.c works properly, otherwise have to move them here
     */
    struct ttm_dma_tt ttm;
    struct drm_device *dev;
    struct nouveau_mem *node;
};

static void
nouveau_sgdma_destroy(struct ttm_tt *ttm)
{
    struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;

    if (ttm) {
        ttm_dma_tt_fini(&nvbe->ttm);
        kfree(nvbe);
    }
}

static int
nv04_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
{
    struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
    struct nouveau_mem *node = mem->mm_node;
    u64 size = mem->num_pages << 12;

    if (ttm->sg) {
        node->sg = ttm->sg;
        nouveau_vm_map_sg_table(&node->vma[0], 0, size, node);
    } else {
        node->pages = nvbe->ttm.dma_address;
        nouveau_vm_map_sg(&node->vma[0], 0, size, node);
    }

    nvbe->node = node;
    return 0;
}

static int
nv04_sgdma_unbind(struct ttm_tt *ttm)
{
    struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
    nouveau_vm_unmap(&nvbe->node->vma[0]);
    return 0;
}

static struct ttm_backend_func nv04_sgdma_backend = {
    .bind           = nv04_sgdma_bind,
    .unbind         = nv04_sgdma_unbind,
    .destroy        = nouveau_sgdma_destroy
};

static int
nv50_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
{
    struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
    struct nouveau_mem *node = mem->mm_node;

    /* noop: bound in move_notify() */
    if (ttm->sg) {
        node->sg = ttm->sg;
    } else
        node->pages = nvbe->ttm.dma_address;
    return 0;
}

static int
nv50_sgdma_unbind(struct ttm_tt *ttm)
{
    /* noop: unbound in move_notify() */
    return 0;
}

static struct ttm_backend_func nv50_sgdma_backend = {
    .bind           = nv50_sgdma_bind,
    .unbind         = nv50_sgdma_unbind,
    .destroy        = nouveau_sgdma_destroy
};

struct ttm_tt *
nouveau_sgdma_create_ttm(struct ttm_bo_device *bdev,
             unsigned long size, uint32_t page_flags,
             struct page *dummy_read_page)
{
    struct nouveau_drm *drm = nouveau_bdev(bdev);
    struct nouveau_sgdma_be *nvbe;

    nvbe = kzalloc(sizeof(*nvbe), GFP_KERNEL);
    if (!nvbe)
        return NULL;

    nvbe->dev = drm->dev;
    if (nv_device(drm->device)->card_type < NV_50)
        nvbe->ttm.ttm.func = &nv04_sgdma_backend;
    else
        nvbe->ttm.ttm.func = &nv50_sgdma_backend;

    if (ttm_dma_tt_init(&nvbe->ttm, bdev, size, page_flags, dummy_read_page)) {
        kfree(nvbe);
        return NULL;
    }
    return &nvbe->ttm.ttm;
}