From 6118411428a393fb0868bad9025d71875418058b Mon Sep 17 00:00:00 2001 From: Danilo Krummrich Date: Wed, 8 Nov 2023 01:12:36 +0100 Subject: [PATCH] drm/nouveau: make use of the GPUVM's shared dma-resv DRM GEM objects private to a single GPUVM can use a shared dma-resv. Make use of the shared dma-resv of GPUVM rather than a driver specific one. The shared dma-resv originates from a "root" GEM object serving as container for the dma-resv to make it compatible with drm_exec. In order to make sure the object proving the shared dma-resv can't be freed up before the objects making use of it, let every such GEM object take a reference on it. Reviewed-by: Dave Airlie Signed-off-by: Danilo Krummrich Link: https://patchwork.freedesktop.org/patch/msgid/20231108001259.15123-7-dakr@redhat.com --- drivers/gpu/drm/nouveau/nouveau_bo.c | 11 +++++++++-- drivers/gpu/drm/nouveau/nouveau_bo.h | 5 +++++ drivers/gpu/drm/nouveau/nouveau_gem.c | 10 ++++++++-- drivers/gpu/drm/nouveau/nouveau_uvmm.c | 7 ++----- drivers/gpu/drm/nouveau/nouveau_uvmm.h | 1 - 5 files changed, 24 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c index 0f3bd187ede6..7afad86da64b 100644 --- a/drivers/gpu/drm/nouveau/nouveau_bo.c +++ b/drivers/gpu/drm/nouveau/nouveau_bo.c @@ -148,10 +148,17 @@ nouveau_bo_del_ttm(struct ttm_buffer_object *bo) * If nouveau_bo_new() allocated this buffer, the GEM object was never * initialized, so don't attempt to release it. */ - if (bo->base.dev) + if (bo->base.dev) { + /* Gem objects not being shared with other VMs get their + * dma_resv from a root GEM object. + */ + if (nvbo->no_share) + drm_gem_object_put(nvbo->r_obj); + drm_gem_object_release(&bo->base); - else + } else { dma_resv_fini(&bo->base._resv); + } kfree(nvbo); } diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.h b/drivers/gpu/drm/nouveau/nouveau_bo.h index 07f671cf895e..70c551921a9e 100644 --- a/drivers/gpu/drm/nouveau/nouveau_bo.h +++ b/drivers/gpu/drm/nouveau/nouveau_bo.h @@ -26,6 +26,11 @@ struct nouveau_bo { struct list_head entry; int pbbo_index; bool validate_mapped; + + /* Root GEM object we derive the dma_resv of in case this BO is not + * shared between VMs. + */ + struct drm_gem_object *r_obj; bool no_share; /* GPU address space is independent of CPU word size */ diff --git a/drivers/gpu/drm/nouveau/nouveau_gem.c b/drivers/gpu/drm/nouveau/nouveau_gem.c index a0d303e5ce3d..49c2bcbef129 100644 --- a/drivers/gpu/drm/nouveau/nouveau_gem.c +++ b/drivers/gpu/drm/nouveau/nouveau_gem.c @@ -111,7 +111,8 @@ nouveau_gem_object_open(struct drm_gem_object *gem, struct drm_file *file_priv) if (vmm->vmm.object.oclass < NVIF_CLASS_VMM_NV50) return 0; - if (nvbo->no_share && uvmm && &uvmm->resv != nvbo->bo.base.resv) + if (nvbo->no_share && uvmm && + drm_gpuvm_resv(&uvmm->base) != nvbo->bo.base.resv) return -EPERM; ret = ttm_bo_reserve(&nvbo->bo, false, false, NULL); @@ -245,7 +246,7 @@ nouveau_gem_new(struct nouveau_cli *cli, u64 size, int align, uint32_t domain, if (unlikely(!uvmm)) return -EINVAL; - resv = &uvmm->resv; + resv = drm_gpuvm_resv(&uvmm->base); } if (!(domain & (NOUVEAU_GEM_DOMAIN_VRAM | NOUVEAU_GEM_DOMAIN_GART))) @@ -288,6 +289,11 @@ nouveau_gem_new(struct nouveau_cli *cli, u64 size, int align, uint32_t domain, if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_TESLA) nvbo->valid_domains &= domain; + if (nvbo->no_share) { + nvbo->r_obj = drm_gpuvm_resv_obj(&uvmm->base); + drm_gem_object_get(nvbo->r_obj); + } + *pnvbo = nvbo; return 0; } diff --git a/drivers/gpu/drm/nouveau/nouveau_uvmm.c b/drivers/gpu/drm/nouveau/nouveau_uvmm.c index f74bf30bc683..8977a518de96 100644 --- a/drivers/gpu/drm/nouveau/nouveau_uvmm.c +++ b/drivers/gpu/drm/nouveau/nouveau_uvmm.c @@ -1802,7 +1802,6 @@ nouveau_uvmm_init(struct nouveau_uvmm *uvmm, struct nouveau_cli *cli, int ret; mutex_init(&uvmm->mutex); - dma_resv_init(&uvmm->resv); mt_init_flags(&uvmm->region_mt, MT_FLAGS_LOCK_EXTERN); mt_set_external_lock(&uvmm->region_mt, &uvmm->mutex); @@ -1842,14 +1841,14 @@ nouveau_uvmm_init(struct nouveau_uvmm *uvmm, struct nouveau_cli *cli, kernel_managed_addr, kernel_managed_size, NULL, 0, &cli->uvmm.vmm.vmm); if (ret) - goto out_free_gpuva_mgr; + goto out_gpuvm_fini; cli->uvmm.vmm.cli = cli; mutex_unlock(&cli->mutex); return 0; -out_free_gpuva_mgr: +out_gpuvm_fini: drm_gpuvm_destroy(&uvmm->base); out_unlock: mutex_unlock(&cli->mutex); @@ -1907,6 +1906,4 @@ nouveau_uvmm_fini(struct nouveau_uvmm *uvmm) nouveau_vmm_fini(&uvmm->vmm); drm_gpuvm_destroy(&uvmm->base); mutex_unlock(&cli->mutex); - - dma_resv_fini(&uvmm->resv); } diff --git a/drivers/gpu/drm/nouveau/nouveau_uvmm.h b/drivers/gpu/drm/nouveau/nouveau_uvmm.h index 06a0c36de392..22607270fae0 100644 --- a/drivers/gpu/drm/nouveau/nouveau_uvmm.h +++ b/drivers/gpu/drm/nouveau/nouveau_uvmm.h @@ -12,7 +12,6 @@ struct nouveau_uvmm { struct nouveau_vmm vmm; struct maple_tree region_mt; struct mutex mutex; - struct dma_resv resv; bool disabled; };