1 // SPDX-License-Identifier: MIT
2 #include <linux/pagemap.h>
3 #include <linux/slab.h>
5 #include "nouveau_drv.h"
6 #include "nouveau_mem.h"
7 #include "nouveau_ttm.h"
9 struct nouveau_sgdma_be {
10 /* this has to be the first field so populate/unpopulated in
11 * nouve_bo.c works properly, otherwise have to move them here
13 struct ttm_dma_tt ttm;
14 struct nouveau_mem *mem;
18 nouveau_sgdma_destroy(struct ttm_tt *ttm)
20 struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
23 ttm_dma_tt_fini(&nvbe->ttm);
29 nv04_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *reg)
31 struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
32 struct nouveau_mem *mem = nouveau_mem(reg);
35 ret = nouveau_mem_host(reg, &nvbe->ttm);
39 ret = nouveau_mem_map(mem, &mem->cli->vmm.vmm, &mem->vma[0]);
41 nouveau_mem_fini(mem);
50 nv04_sgdma_unbind(struct ttm_tt *ttm)
52 struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
53 nouveau_mem_fini(nvbe->mem);
56 static struct ttm_backend_func nv04_sgdma_backend = {
57 .bind = nv04_sgdma_bind,
58 .unbind = nv04_sgdma_unbind,
59 .destroy = nouveau_sgdma_destroy
63 nv50_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *reg)
65 struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
66 struct nouveau_mem *mem = nouveau_mem(reg);
69 ret = nouveau_mem_host(reg, &nvbe->ttm);
77 static struct ttm_backend_func nv50_sgdma_backend = {
78 .bind = nv50_sgdma_bind,
79 .unbind = nv04_sgdma_unbind,
80 .destroy = nouveau_sgdma_destroy
84 nouveau_sgdma_create_ttm(struct ttm_buffer_object *bo, uint32_t page_flags)
86 struct nouveau_drm *drm = nouveau_bdev(bo->bdev);
87 struct nouveau_sgdma_be *nvbe;
89 nvbe = kzalloc(sizeof(*nvbe), GFP_KERNEL);
93 if (drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA)
94 nvbe->ttm.ttm.func = &nv04_sgdma_backend;
96 nvbe->ttm.ttm.func = &nv50_sgdma_backend;
98 if (ttm_dma_tt_init(&nvbe->ttm, bo, page_flags))
100 * A failing ttm_dma_tt_init() will call ttm_tt_destroy()
101 * and thus our nouveau_sgdma_destroy() hook, so we don't need
105 return &nvbe->ttm.ttm;