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drm/nouveau: Fix fallout from reservation object rework 

Commit 019cbd4a4f ("drm/nouveau: Initialize GEM object before TTM
object") introduced a subtle change in how the buffer allocation size is
handled. Prior to that change, the size would get aligned to at least a
page, whereas after that change a non-page-aligned size would get passed
through unmodified. This ultimately causes a BUG_ON() to trigger in
drm_gem_private_object_init() and crashes the system.

Fix this by restoring the code that align the allocation size.

Fixes: 019cbd4a4f ("drm/nouveau: Initialize GEM object before TTM object")
Reported-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Thierry Reding 2019-09-16 16:19:23 +02:00 committed by Ben Skeggs
parent 698c1aa9f8
commit 9ca7f7968b
4 changed files with 17 additions and 13 deletions
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16
drivers/gpu/drm/nouveau/nouveau_bo.c
View File

@ -186,8 +186,8 @@ nouveau_bo_fixup_align(struct nouveau_bo *nvbo, u32 flags,
}
struct nouveau_bo *
nouveau_bo_alloc(struct nouveau_cli *cli, u64 size, u32 flags, u32 tile_mode,
u32 tile_flags)
nouveau_bo_alloc(struct nouveau_cli *cli, u64 *size, int *align, u32 flags,
u32 tile_mode, u32 tile_flags)
{
struct nouveau_drm *drm = cli->drm;
struct nouveau_bo *nvbo;
@ -195,8 +195,8 @@ nouveau_bo_alloc(struct nouveau_cli *cli, u64 size, u32 flags, u32 tile_mode,
struct nvif_vmm *vmm = cli->svm.cli ? &cli->svm.vmm : &cli->vmm.vmm;
int i, pi = -1;
if (!size) {
NV_WARN(drm, "skipped size %016llx\n", size);
if (!*size) {
NV_WARN(drm, "skipped size %016llx\n", *size);
return ERR_PTR(-EINVAL);
}
@ -266,7 +266,7 @@ nouveau_bo_alloc(struct nouveau_cli *cli, u64 size, u32 flags, u32 tile_mode,
pi = i;
/* Stop once the buffer is larger than the current page size. */
if (size >= 1ULL << vmm->page[i].shift)
if (*size >= 1ULL << vmm->page[i].shift)
break;
}
@ -281,6 +281,8 @@ nouveau_bo_alloc(struct nouveau_cli *cli, u64 size, u32 flags, u32 tile_mode,
}
nvbo->page = vmm->page[pi].shift;
nouveau_bo_fixup_align(nvbo, flags, align, size);
return nvbo;
}
@ -294,7 +296,6 @@ nouveau_bo_init(struct nouveau_bo *nvbo, u64 size, int align, u32 flags,
acc_size = ttm_bo_dma_acc_size(nvbo->bo.bdev, size, sizeof(*nvbo));
nouveau_bo_fixup_align(nvbo, flags, &align, &size);
nvbo->bo.mem.num_pages = size >> PAGE_SHIFT;
nouveau_bo_placement_set(nvbo, flags, 0);
@ -318,7 +319,8 @@ nouveau_bo_new(struct nouveau_cli *cli, u64 size, int align,
struct nouveau_bo *nvbo;
int ret;
nvbo = nouveau_bo_alloc(cli, size, flags, tile_mode, tile_flags);
nvbo = nouveau_bo_alloc(cli, &size, &align, flags, tile_mode,
tile_flags);
if (IS_ERR(nvbo))
return PTR_ERR(nvbo);

4
drivers/gpu/drm/nouveau/nouveau_bo.h
View File

@ -71,8 +71,8 @@ nouveau_bo_ref(struct nouveau_bo *ref, struct nouveau_bo **pnvbo)
extern struct ttm_bo_driver nouveau_bo_driver;
void nouveau_bo_move_init(struct nouveau_drm *);
struct nouveau_bo *nouveau_bo_alloc(struct nouveau_cli *, u64 size, u32 flags,
u32 tile_mode, u32 tile_flags);
struct nouveau_bo *nouveau_bo_alloc(struct nouveau_cli *, u64 *size, int *align,
u32 flags, u32 tile_mode, u32 tile_flags);
int nouveau_bo_init(struct nouveau_bo *, u64 size, int align, u32 flags,
struct sg_table *sg, struct dma_resv *robj);
int nouveau_bo_new(struct nouveau_cli *, u64 size, int align, u32 flags,

3
drivers/gpu/drm/nouveau/nouveau_gem.c
View File

@ -188,7 +188,8 @@ nouveau_gem_new(struct nouveau_cli *cli, u64 size, int align, uint32_t domain,
if (domain & NOUVEAU_GEM_DOMAIN_COHERENT)
flags |= TTM_PL_FLAG_UNCACHED;
nvbo = nouveau_bo_alloc(cli, size, flags, tile_mode, tile_flags);
nvbo = nouveau_bo_alloc(cli, &size, &align, flags, tile_mode,
tile_flags);
if (IS_ERR(nvbo))
return PTR_ERR(nvbo);

7
drivers/gpu/drm/nouveau/nouveau_prime.c
View File

@ -62,14 +62,15 @@ struct drm_gem_object *nouveau_gem_prime_import_sg_table(struct drm_device *dev,
struct nouveau_drm *drm = nouveau_drm(dev);
struct nouveau_bo *nvbo;
struct dma_resv *robj = attach->dmabuf->resv;
size_t size = attach->dmabuf->size;
u64 size = attach->dmabuf->size;
u32 flags = 0;
int align = 0;
int ret;
flags = TTM_PL_FLAG_TT;
dma_resv_lock(robj, NULL);
nvbo = nouveau_bo_alloc(&drm->client, size, flags, 0, 0);
nvbo = nouveau_bo_alloc(&drm->client, &size, &align, flags, 0, 0);
dma_resv_unlock(robj);
if (IS_ERR(nvbo))
return ERR_CAST(nvbo);
@ -84,7 +85,7 @@ struct drm_gem_object *nouveau_gem_prime_import_sg_table(struct drm_device *dev,
return ERR_PTR(-ENOMEM);
}
ret = nouveau_bo_init(nvbo, size, 0, flags, sg, robj);
ret = nouveau_bo_init(nvbo, size, align, flags, sg, robj);
if (ret) {
nouveau_bo_ref(NULL, &nvbo);
return ERR_PTR(ret);