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([2a02:810d:4b3f:de9c:abf:b8ff:feee:998b]) by smtp.gmail.com with ESMTPSA id bm2-20020a0564020b0200b005487d3fb436sm7823433edb.90.2023.11.29.14.08.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Nov 2023 14:08:42 -0800 (PST) From: Danilo Krummrich To: mripard@kernel.org, airlied@gmail.com, daniel@ffwll.ch, frank.binns@imgtec.com, donald.robson@imgtec.com, matt.coster@imgtec.com, sarah.walker@imgtec.com Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Danilo Krummrich , =?UTF-8?q?Christian=20K=C3=B6nig?= Subject: [PATCH drm-misc-next v2 1/2] drm/gpuvm: fall back to drm_exec_lock_obj() Date: Wed, 29 Nov 2023 23:08:00 +0100 Message-ID: <20231129220835.297885-2-dakr@redhat.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231129220835.297885-1-dakr@redhat.com> References: <20231129220835.297885-1-dakr@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Fall back to drm_exec_lock_obj() if num_fences is zero for the drm_gpuvm_prepare_* function family. Otherwise dma_resv_reserve_fences() would actually allocate slots even though num_fences is zero. Cc: Christian K=C3=B6nig Signed-off-by: Danilo Krummrich --- drivers/gpu/drm/drm_gpuvm.c | 43 ++++++++++++++++++++++++++++++++----- include/drm/drm_gpuvm.h | 23 +++----------------- 2 files changed, 41 insertions(+), 25 deletions(-) diff --git a/drivers/gpu/drm/drm_gpuvm.c b/drivers/gpu/drm/drm_gpuvm.c index 54f5e8851de5..07a6676bc4f9 100644 --- a/drivers/gpu/drm/drm_gpuvm.c +++ b/drivers/gpu/drm/drm_gpuvm.c @@ -1085,6 +1085,37 @@ drm_gpuvm_put(struct drm_gpuvm *gpuvm) } EXPORT_SYMBOL_GPL(drm_gpuvm_put); =20 +static int +exec_prepare_obj(struct drm_exec *exec, struct drm_gem_object *obj, + unsigned int num_fences) +{ + return num_fences ? drm_exec_prepare_obj(exec, obj, num_fences) : + drm_exec_lock_obj(exec, obj); +} + +/** + * drm_gpuvm_prepare_vm() - prepare the GPUVMs common dma-resv + * @gpuvm: the &drm_gpuvm + * @exec: the &drm_exec context + * @num_fences: the amount of &dma_fences to reserve + * + * Calls drm_exec_prepare_obj() for the GPUVMs dummy &drm_gem_object; if + * @num_fences is zero drm_exec_lock_obj() is called instead. + * + * Using this function directly, it is the drivers responsibility to call + * drm_exec_init() and drm_exec_fini() accordingly. + * + * Returns: 0 on success, negative error code on failure. + */ +int +drm_gpuvm_prepare_vm(struct drm_gpuvm *gpuvm, + struct drm_exec *exec, + unsigned int num_fences) +{ + return exec_prepare_obj(exec, gpuvm->r_obj, num_fences); +} +EXPORT_SYMBOL_GPL(drm_gpuvm_prepare_vm); + static int __drm_gpuvm_prepare_objects(struct drm_gpuvm *gpuvm, struct drm_exec *exec, @@ -1095,7 +1126,7 @@ __drm_gpuvm_prepare_objects(struct drm_gpuvm *gpuvm, int ret =3D 0; =20 for_each_vm_bo_in_list(gpuvm, extobj, &extobjs, vm_bo) { - ret =3D drm_exec_prepare_obj(exec, vm_bo->obj, num_fences); + ret =3D exec_prepare_obj(exec, vm_bo->obj, num_fences); if (ret) break; } @@ -1116,7 +1147,7 @@ drm_gpuvm_prepare_objects_locked(struct drm_gpuvm *gp= uvm, =20 drm_gpuvm_resv_assert_held(gpuvm); list_for_each_entry(vm_bo, &gpuvm->extobj.list, list.entry.extobj) { - ret =3D drm_exec_prepare_obj(exec, vm_bo->obj, num_fences); + ret =3D exec_prepare_obj(exec, vm_bo->obj, num_fences); if (ret) break; =20 @@ -1134,7 +1165,8 @@ drm_gpuvm_prepare_objects_locked(struct drm_gpuvm *gp= uvm, * @num_fences: the amount of &dma_fences to reserve * * Calls drm_exec_prepare_obj() for all &drm_gem_objects the given - * &drm_gpuvm contains mappings of. + * &drm_gpuvm contains mappings of; if @num_fences is zero drm_exec_lock_o= bj() + * is called instead. * * Using this function directly, it is the drivers responsibility to call * drm_exec_init() and drm_exec_fini() accordingly. @@ -1171,7 +1203,8 @@ EXPORT_SYMBOL_GPL(drm_gpuvm_prepare_objects); * @num_fences: the amount of &dma_fences to reserve * * Calls drm_exec_prepare_obj() for all &drm_gem_objects mapped between @a= ddr - * and @addr + @range. + * and @addr + @range; if @num_fences is zero drm_exec_lock_obj() is called + * instead. * * Returns: 0 on success, negative error code on failure. */ @@ -1186,7 +1219,7 @@ drm_gpuvm_prepare_range(struct drm_gpuvm *gpuvm, stru= ct drm_exec *exec, drm_gpuvm_for_each_va_range(va, gpuvm, addr, end) { struct drm_gem_object *obj =3D va->gem.obj; =20 - ret =3D drm_exec_prepare_obj(exec, obj, num_fences); + ret =3D exec_prepare_obj(exec, obj, num_fences); if (ret) return ret; } diff --git a/include/drm/drm_gpuvm.h b/include/drm/drm_gpuvm.h index f94fec9a8517..b3f82ec7fb17 100644 --- a/include/drm/drm_gpuvm.h +++ b/include/drm/drm_gpuvm.h @@ -544,26 +544,9 @@ struct drm_gpuvm_exec { } extra; }; =20 -/** - * drm_gpuvm_prepare_vm() - prepare the GPUVMs common dma-resv - * @gpuvm: the &drm_gpuvm - * @exec: the &drm_exec context - * @num_fences: the amount of &dma_fences to reserve - * - * Calls drm_exec_prepare_obj() for the GPUVMs dummy &drm_gem_object. - * - * Using this function directly, it is the drivers responsibility to call - * drm_exec_init() and drm_exec_fini() accordingly. - * - * Returns: 0 on success, negative error code on failure. - */ -static inline int -drm_gpuvm_prepare_vm(struct drm_gpuvm *gpuvm, - struct drm_exec *exec, - unsigned int num_fences) -{ - return drm_exec_prepare_obj(exec, gpuvm->r_obj, num_fences); -} +int drm_gpuvm_prepare_vm(struct drm_gpuvm *gpuvm, + struct drm_exec *exec, + unsigned int num_fences); =20 int drm_gpuvm_prepare_objects(struct drm_gpuvm *gpuvm, struct drm_exec *exec, --=20 2.43.0