From: Jerome Glisse jglisse@redhat.com

Virtual address need to be fenced to know when we can safely remove it. This patch also properly clear the pagetable. Previously it was serouisly broken.

v2: For to update pagetable when unbinding bo (don't bailout if bo_va->valid is true). v3: Fix compilation warnings v4: We need a special version for 3.5 because the locking scheme is different btw 3.5 and 3.6. There is no longer cs mutex in 3.6 instead there is a global vm mutex.

This version is for stable 3.5 only.

cc: stable@vger.kernel.org Signed-off-by: Jerome Glisse jglisse@redhat.com --- drivers/gpu/drm/radeon/radeon.h | 1 + drivers/gpu/drm/radeon/radeon_cs.c | 30 +++++++++++++++++++++++++++--- drivers/gpu/drm/radeon/radeon_gart.c | 24 ++++++++++++++++++++++-- drivers/gpu/drm/radeon/radeon_gem.c | 13 ++----------- drivers/gpu/drm/radeon/radeon_object.c | 6 +----- 5 files changed, 53 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h index fefcca5..01d2a87 100644 --- a/drivers/gpu/drm/radeon/radeon.h +++ b/drivers/gpu/drm/radeon/radeon.h @@ -323,6 +323,7 @@ struct radeon_bo_va { uint64_t soffset; uint64_t eoffset; uint32_t flags; + struct radeon_fence *fence; bool valid; };

diff --git a/drivers/gpu/drm/radeon/radeon_cs.c b/drivers/gpu/drm/radeon/radeon_cs.c index 142f894..3680df0 100644 --- a/drivers/gpu/drm/radeon/radeon_cs.c +++ b/drivers/gpu/drm/radeon/radeon_cs.c @@ -294,6 +294,28 @@ int radeon_cs_parser_init(struct radeon_cs_parser *p, void *data) return 0; }

+static void radeon_bo_vm_fence_va(struct radeon_cs_parser *parser, + struct radeon_fence *fence) +{ + struct radeon_fpriv *fpriv = parser->filp->driver_priv; + struct radeon_vm *vm = &fpriv->vm; + struct radeon_bo_list *lobj; + + if (parser->chunk_ib_idx == -1) + return; + if ((parser->cs_flags & RADEON_CS_USE_VM) == 0) + return; + + list_for_each_entry(lobj, &parser->validated, tv.head) { + struct radeon_bo_va *bo_va; + struct radeon_bo *rbo = lobj->bo; + + bo_va = radeon_bo_va(rbo, vm); + radeon_fence_unref(&bo_va->fence); + bo_va->fence = radeon_fence_ref(fence); + } +} + /** * cs_parser_fini() - clean parser states * @parser: parser structure holding parsing context. @@ -306,11 +328,14 @@ static void radeon_cs_parser_fini(struct radeon_cs_parser *parser, int error) { unsigned i;

- if (!error) + if (!error) { + /* fence all bo va before ttm_eu_fence_buffer_objects so bo are still reserved */ + radeon_bo_vm_fence_va(parser, parser->ib.fence); ttm_eu_fence_buffer_objects(&parser->validated, parser->ib.fence); - else + } else { ttm_eu_backoff_reservation(&parser->validated); + }

if (parser->relocs != NULL) { for (i = 0; i < parser->nrelocs; i++) { @@ -407,7 +432,6 @@ static int radeon_cs_ib_vm_chunk(struct radeon_device *rdev,

if (parser->chunk_ib_idx == -1) return 0; - if ((parser->cs_flags & RADEON_CS_USE_VM) == 0) return 0;

diff --git a/drivers/gpu/drm/radeon/radeon_gart.c b/drivers/gpu/drm/radeon/radeon_gart.c index 84b648a..f651f22 100644 --- a/drivers/gpu/drm/radeon/radeon_gart.c +++ b/drivers/gpu/drm/radeon/radeon_gart.c @@ -564,7 +564,7 @@ int radeon_vm_bo_update_pte(struct radeon_device *rdev, return -EINVAL; }

- if (bo_va->valid) + if (bo_va->valid && mem) return 0;

ngpu_pages = radeon_bo_ngpu_pages(bo); @@ -597,11 +597,27 @@ int radeon_vm_bo_rmv(struct radeon_device *rdev, struct radeon_bo *bo) { struct radeon_bo_va *bo_va; + int r;

bo_va = radeon_bo_va(bo, vm); if (bo_va == NULL) return 0;

+ /* wait for va use to end */ + while (bo_va->fence) { + r = radeon_fence_wait(bo_va->fence, false); + if (r) { + DRM_ERROR("error while waiting for fence: %d\n", r); + } + if (r == -EDEADLK) { + r = radeon_gpu_reset(rdev); + if (!r) + continue; + } + break; + } + radeon_fence_unref(&bo_va->fence); + radeon_mutex_lock(&rdev->cs_mutex); mutex_lock(&vm->mutex); radeon_vm_bo_update_pte(rdev, vm, bo, NULL); @@ -661,12 +677,15 @@ void radeon_vm_fini(struct radeon_device *rdev, struct radeon_vm *vm) radeon_vm_unbind_locked(rdev, vm); radeon_mutex_unlock(&rdev->cs_mutex);

- /* remove all bo */ + /* remove all bo at this point non are busy any more because unbind + * waited for the last vm fence to signal + */ r = radeon_bo_reserve(rdev->ring_tmp_bo.bo, false); if (!r) { bo_va = radeon_bo_va(rdev->ring_tmp_bo.bo, vm); list_del_init(&bo_va->bo_list); list_del_init(&bo_va->vm_list); + radeon_fence_unref(&bo_va->fence); radeon_bo_unreserve(rdev->ring_tmp_bo.bo); kfree(bo_va); } @@ -678,6 +697,7 @@ void radeon_vm_fini(struct radeon_device *rdev, struct radeon_vm *vm) r = radeon_bo_reserve(bo_va->bo, false); if (!r) { list_del_init(&bo_va->bo_list); + radeon_fence_unref(&bo_va->fence); radeon_bo_unreserve(bo_va->bo); kfree(bo_va); } diff --git a/drivers/gpu/drm/radeon/radeon_gem.c b/drivers/gpu/drm/radeon/radeon_gem.c index 21ec9f5..12207d9 100644 --- a/drivers/gpu/drm/radeon/radeon_gem.c +++ b/drivers/gpu/drm/radeon/radeon_gem.c @@ -134,25 +134,16 @@ void radeon_gem_object_close(struct drm_gem_object *obj, struct radeon_device *rdev = rbo->rdev; struct radeon_fpriv *fpriv = file_priv->driver_priv; struct radeon_vm *vm = &fpriv->vm; - struct radeon_bo_va *bo_va, *tmp;

if (rdev->family < CHIP_CAYMAN) { return; }

if (radeon_bo_reserve(rbo, false)) { + dev_err(rdev->dev, "leaking bo va because we fail to reserve bo\n"); return; } - list_for_each_entry_safe(bo_va, tmp, &rbo->va, bo_list) { - if (bo_va->vm == vm) { - /* remove from this vm address space */ - mutex_lock(&vm->mutex); - list_del(&bo_va->vm_list); - mutex_unlock(&vm->mutex); - list_del(&bo_va->bo_list); - kfree(bo_va); - } - } + radeon_vm_bo_rmv(rdev, vm, rbo); radeon_bo_unreserve(rbo); }

diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c index 830f1a7..1b2289f 100644 --- a/drivers/gpu/drm/radeon/radeon_object.c +++ b/drivers/gpu/drm/radeon/radeon_object.c @@ -52,11 +52,7 @@ void radeon_bo_clear_va(struct radeon_bo *bo)

list_for_each_entry_safe(bo_va, tmp, &bo->va, bo_list) { /* remove from all vm address space */ - mutex_lock(&bo_va->vm->mutex); - list_del(&bo_va->vm_list); - mutex_unlock(&bo_va->vm->mutex); - list_del(&bo_va->bo_list); - kfree(bo_va); + radeon_vm_bo_rmv(bo->rdev, bo_va->vm, bo); } }