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Mon, 14 Oct 2024 14:23:35 +0000 From: Matt Coster To: "dri-devel@lists.freedesktop.org" CC: Brendan King , Frank Binns , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , "linux-kernel@vger.kernel.org" Subject: [PATCH v2 2/2] drm/imagination: Break an object reference loop Thread-Topic: [PATCH v2 2/2] drm/imagination: Break an object reference loop Thread-Index: AQHbHkSnYxB3i+0dE0uMRxpUhCZA3Q== Date: Mon, 14 Oct 2024 14:23:35 +0000 Message-ID: <48476abf-2def-4d83-87a3-8cbd8eb9db3b@imgtec.com> References: In-Reply-To: Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-ms-publictraffictype: Email x-ms-traffictypediagnostic: CWXP265MB3397:EE_|CWLP265MB3569:EE_ x-ms-office365-filtering-correlation-id: 4b0648c9-a2d6-40eb-b8a0-08dcec5bc9d1 x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; ARA:13230040|366016|376014|1800799024|38070700018; x-microsoft-antispam-message-info: =?utf-8?q?Q7rmch8rglUUvwK970XOwwfXuHRCQQ0?= =?utf-8?q?u3ZqDb/BQpmZ+Dp6VEXyjSaKkMDYG5mrPb5KvdDgqGEKhLpjP7GsZUPVMm6HvLgkS?= =?utf-8?q?Er2WucLtHqnYGIz0T4B7rApusvYtezeaYeIfBKcboyk91MVmKxSG1qNnL8F+CarCK?= =?utf-8?q?DDoZCagD8FlGkyEKR17syM7dySe/gOQuijfq9ZW9aVhRsO2BHAwZuw5tjQYe2b+Gt?= =?utf-8?q?ALCzLnmOSfTltB3IjfZtFqvjHgIJLsyEmO+nyanCQZ6oscBrSqPzFn2+PiOl2KwOZ?= =?utf-8?q?HasMKNeo80WpC5wOpX80HwrwNJ1BPcV9J1CmNEcFNYW57jyuGdtzOUyAGOf5fW6QS?= =?utf-8?q?uU0egu3OiUdmud8/x9w6YAM9lGeu0QyN+6rWRB0bL+RfRaokrbbEaHlNf2X3A8Hx3?= =?utf-8?q?IwsawQpNSqFNP80FZiCVwbbOtTFm8EDcbII6Q8RBsaeLd8jltKyiiGRhwDTKR+FIA?= =?utf-8?q?qNiduvrjdlNTqHfrXf84IUUIZxXhfOmpIZ5uOfJlhL9YV14+ek/NSzgVUUu6Ave92?= =?utf-8?q?zhYZpZpn81VMQxMV3fraTlZU4zoIT7zD5J2N2PWZ3bEFgs62bFBqHCwM/zgItUQzx?= =?utf-8?q?ZWWX0sKJMgiaJlocA6S2C/h2rjFlXbsgl8+f2OLB7e3evLfuLysnQvOS44Dq44kRn?= =?utf-8?q?d1laboKIQ3ZRHo9rHp4Cjvj+MKPIRVx9c2i7pbkgZOqttZAOWkUWE4I2i8mGD5bmq?= =?utf-8?q?Eka2Fa4l8GTkrLv3r/bu7lpryqb6Gt8IItho62dSznp4ayxrlBnbVLE1vjW3+KR/z?= =?utf-8?q?RyszS4HX1IaW94R4E/zmbIA0M9vdXWQpcWqmJFkF22qLSZA5wP/oCLt+W6JfKoxlh?= =?utf-8?q?Vu8MytH7JVVsqQRYNa8mnXQOBhZ17eBCRnqitiYF3diDOaXV0TQi6UUSCrrQUxxpZ?= =?utf-8?q?kYkFjDrentJoAksUBJIdwg4hh5QnW9dLtSXh168IqlCw3X49rXpgz/bUuqObwo4LZ?= =?utf-8?q?ErFFgoUlxBOhzo2WD5hBxungY02gFDKFHSPSitxNTSeqWb5NGjuNDr6akfHZFjRte?= =?utf-8?q?wxSn1imTVvJ3+j/VeBu2zGxR3YcGB8M0DFvrZCBoEofkfc2so6E2921Z4I5bN0bDy?= =?utf-8?q?ojF17prOw+RTUw+bwdeuz6mG3HHMK7WLMLH0H32u0XNjumYUiIYMmt7nDxNtfEq24?= =?utf-8?q?BaMI5Y1nxNuV2zHFwyc5cYcN2MuQ8lxVatuSISy3HpSu3SAqSvgQZ4/92Y7/5oyrO?= =?utf-8?q?bGExyEMQTcFzKicvQERn8C8BfmX5xfj57MWlbhqKzTUmZAxvowe0Nj1DhJMLTJFR1?= =?utf-8?q?DMcw46j/LW9YAMXjh1GP99RlxfdKt7BGuvA=3D=3D?= x-forefront-antispam-report: CIP:255.255.255.255; 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no reference counts are involved, as is the case for all the other references in the loop. To break the reference loop during cleanup, free the outstanding VM mappings before destroying the PVR Context associated with the VM context. Signed-off-by: Brendan King Signed-off-by: Matt Coster Reviewed-by: Frank Binns --- Changes in v1 -> v2: - None --- drivers/gpu/drm/imagination/pvr_context.c | 19 +++++++++++++++++++ drivers/gpu/drm/imagination/pvr_context.h | 18 ++++++++++++++++++ drivers/gpu/drm/imagination/pvr_vm.c | 22 ++++++++++++++++++---- drivers/gpu/drm/imagination/pvr_vm.h | 1 + 4 files changed, 56 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/imagination/pvr_context.c b/drivers/gpu/drm/imagination/pvr_context.c index 255c93582734..4cb3494c0bb2 100644 --- a/drivers/gpu/drm/imagination/pvr_context.c +++ b/drivers/gpu/drm/imagination/pvr_context.c @@ -450,11 +450,30 @@ pvr_context_destroy(struct pvr_file *pvr_file, u32 handle) */ void pvr_destroy_contexts_for_file(struct pvr_file *pvr_file) { + struct pvr_device *pvr_dev = pvr_file->pvr_dev; struct pvr_context *ctx; unsigned long handle; xa_for_each(&pvr_file->ctx_handles, handle, ctx) pvr_context_destroy(pvr_file, handle); + + spin_lock(&pvr_dev->ctx_list_lock); + ctx = list_first_entry(&pvr_file->contexts, struct pvr_context, file_link); + + while (!list_entry_is_head(ctx, &pvr_file->contexts, file_link)) { + list_del_init(&ctx->file_link); + + if (pvr_context_get_if_referenced(ctx)) { + spin_unlock(&pvr_dev->ctx_list_lock); + + pvr_vm_unmap_all(ctx->vm_ctx); + + pvr_context_put(ctx); + spin_lock(&pvr_dev->ctx_list_lock); + } + ctx = list_first_entry(&pvr_file->contexts, struct pvr_context, file_link); + } + spin_unlock(&pvr_dev->ctx_list_lock); } /** diff --git a/drivers/gpu/drm/imagination/pvr_context.h b/drivers/gpu/drm/imagination/pvr_context.h index a5b0a82a54a1..07afa179cdf4 100644 --- a/drivers/gpu/drm/imagination/pvr_context.h +++ b/drivers/gpu/drm/imagination/pvr_context.h @@ -126,6 +126,24 @@ pvr_context_get(struct pvr_context *ctx) return ctx; } +/** + * pvr_context_get_if_referenced() - Take an additional reference on a still + * referenced context. + * @ctx: Context pointer. + * + * Call pvr_context_put() to release. + * + * Returns: + * * True on success, or + * * false if no context pointer passed, or the context wasn't still + * * referenced. + */ +static __always_inline bool +pvr_context_get_if_referenced(struct pvr_context *ctx) +{ + return ctx != NULL && kref_get_unless_zero(&ctx->ref_count) != 0; +} + /** * pvr_context_lookup() - Lookup context pointer from handle and file. * @pvr_file: Pointer to pvr_file structure. diff --git a/drivers/gpu/drm/imagination/pvr_vm.c b/drivers/gpu/drm/imagination/pvr_vm.c index 97c0f772ed65..7bd6ba4c6e8a 100644 --- a/drivers/gpu/drm/imagination/pvr_vm.c +++ b/drivers/gpu/drm/imagination/pvr_vm.c @@ -14,6 +14,7 @@ #include #include +#include #include #include #include @@ -597,12 +598,26 @@ pvr_vm_create_context(struct pvr_device *pvr_dev, bool is_userspace_context) } /** - * pvr_vm_context_release() - Teardown a VM context. - * @ref_count: Pointer to reference counter of the VM context. + * pvr_vm_unmap_all() - Unmap all mappings associated with a VM context. + * @vm_ctx: Target VM context. * * This function ensures that no mappings are left dangling by unmapping them * all in order of ascending device-virtual address. */ +void +pvr_vm_unmap_all(struct pvr_vm_context *vm_ctx) +{ + WARN_ON(pvr_vm_unmap(vm_ctx, vm_ctx->gpuvm_mgr.mm_start, + vm_ctx->gpuvm_mgr.mm_range)); +} + +/** + * pvr_vm_context_release() - Teardown a VM context. + * @ref_count: Pointer to reference counter of the VM context. + * + * This function also ensures that no mappings are left dangling by calling + * pvr_vm_unmap_all. + */ static void pvr_vm_context_release(struct kref *ref_count) { @@ -612,8 +627,7 @@ pvr_vm_context_release(struct kref *ref_count) if (vm_ctx->fw_mem_ctx_obj) pvr_fw_object_destroy(vm_ctx->fw_mem_ctx_obj); - WARN_ON(pvr_vm_unmap(vm_ctx, vm_ctx->gpuvm_mgr.mm_start, - vm_ctx->gpuvm_mgr.mm_range)); + pvr_vm_unmap_all(vm_ctx); pvr_mmu_context_destroy(vm_ctx->mmu_ctx); drm_gem_private_object_fini(&vm_ctx->dummy_gem); diff --git a/drivers/gpu/drm/imagination/pvr_vm.h b/drivers/gpu/drm/imagination/pvr_vm.h index f2a6463f2b05..79406243617c 100644 --- a/drivers/gpu/drm/imagination/pvr_vm.h +++ b/drivers/gpu/drm/imagination/pvr_vm.h @@ -39,6 +39,7 @@ int pvr_vm_map(struct pvr_vm_context *vm_ctx, struct pvr_gem_object *pvr_obj, u64 pvr_obj_offset, u64 device_addr, u64 size); int pvr_vm_unmap(struct pvr_vm_context *vm_ctx, u64 device_addr, u64 size); +void pvr_vm_unmap_all(struct pvr_vm_context *vm_ctx); dma_addr_t pvr_vm_get_page_table_root_addr(struct pvr_vm_context *vm_ctx); struct dma_resv *pvr_vm_get_dma_resv(struct pvr_vm_context *vm_ctx);