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GET /api/patches/103973/?format=api
{ "id": 103973, "url": "http://patches.dpdk.org/api/patches/103973/?format=api", "web_url": "http://patches.dpdk.org/project/dpdk/patch/20211108185805.3887-4-eagostini@nvidia.com/", "project": { "id": 1, "url": "http://patches.dpdk.org/api/projects/1/?format=api", "name": "DPDK", "link_name": "dpdk", "list_id": "dev.dpdk.org", "list_email": "dev@dpdk.org", "web_url": "http://core.dpdk.org", "scm_url": "git://dpdk.org/dpdk", "webscm_url": "http://git.dpdk.org/dpdk", "list_archive_url": "https://inbox.dpdk.org/dev", "list_archive_url_format": "https://inbox.dpdk.org/dev/{}", "commit_url_format": "" }, "msgid": "<20211108185805.3887-4-eagostini@nvidia.com>", "list_archive_url": "https://inbox.dpdk.org/dev/20211108185805.3887-4-eagostini@nvidia.com", "date": "2021-11-08T18:57:59", "name": "[v5,3/9] gpudev: add child device representing a device context", "commit_ref": null, "pull_url": null, "state": "accepted", "archived": true, "hash": "00e5d67c2ffc0b2992439b1d9d5dae4eee845cd8", "submitter": { "id": 1571, "url": "http://patches.dpdk.org/api/people/1571/?format=api", "name": "Elena Agostini", "email": "eagostini@nvidia.com" }, "delegate": { "id": 1, "url": "http://patches.dpdk.org/api/users/1/?format=api", "username": "tmonjalo", "first_name": "Thomas", "last_name": "Monjalon", "email": "thomas@monjalon.net" }, "mbox": "http://patches.dpdk.org/project/dpdk/patch/20211108185805.3887-4-eagostini@nvidia.com/mbox/", "series": [ { "id": 20381, "url": "http://patches.dpdk.org/api/series/20381/?format=api", "web_url": "http://patches.dpdk.org/project/dpdk/list/?series=20381", "date": "2021-11-08T18:57:56", "name": "GPU library", "version": 5, "mbox": "http://patches.dpdk.org/series/20381/mbox/" } ], "comments": "http://patches.dpdk.org/api/patches/103973/comments/", "check": "success", "checks": "http://patches.dpdk.org/api/patches/103973/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<dev-bounces@dpdk.org>", "X-Original-To": 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SFS:(4636009)(46966006)(36840700001)(508600001)(8936002)(4326008)(47076005)(82310400003)(336012)(55016002)(6286002)(86362001)(16526019)(7696005)(8676002)(70206006)(186003)(70586007)(316002)(36860700001)(5660300002)(1076003)(36756003)(2876002)(6916009)(7636003)(356005)(83380400001)(426003)(2906002)(2616005)(26005);\n DIR:OUT; SFP:1101;", "X-OriginatorOrg": "Nvidia.com", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "08 Nov 2021 10:47:04.3958 (UTC)", "X-MS-Exchange-CrossTenant-Network-Message-Id": "\n 50693c8f-c5fb-4652-cc7a-08d9a2a51a5a", "X-MS-Exchange-CrossTenant-Id": "43083d15-7273-40c1-b7db-39efd9ccc17a", "X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp": "\n TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[216.228.112.34];\n Helo=[mail.nvidia.com]", "X-MS-Exchange-CrossTenant-AuthSource": "\n CO1NAM11FT064.eop-nam11.prod.protection.outlook.com", "X-MS-Exchange-CrossTenant-AuthAs": "Anonymous", "X-MS-Exchange-CrossTenant-FromEntityHeader": "HybridOnPrem", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "BY5PR12MB3874", "Subject": "[dpdk-dev] [PATCH v5 3/9] gpudev: add child device representing a\n device context", "X-BeenThere": "dev@dpdk.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "DPDK patches and discussions <dev.dpdk.org>", "List-Unsubscribe": "<https://mails.dpdk.org/options/dev>,\n <mailto:dev-request@dpdk.org?subject=unsubscribe>", "List-Archive": "<http://mails.dpdk.org/archives/dev/>", "List-Post": "<mailto:dev@dpdk.org>", "List-Help": "<mailto:dev-request@dpdk.org?subject=help>", "List-Subscribe": "<https://mails.dpdk.org/listinfo/dev>,\n <mailto:dev-request@dpdk.org?subject=subscribe>", "Errors-To": "dev-bounces@dpdk.org", "Sender": "\"dev\" <dev-bounces@dpdk.org>" }, "content": "From: Thomas Monjalon <thomas@monjalon.net>\n\nThe computing device may operate in some isolated contexts.\nMemory and processing are isolated in a silo represented by\na child device.\nThe context is provided as an opaque by the caller of\nrte_gpu_add_child().\n\nSigned-off-by: Thomas Monjalon <thomas@monjalon.net>\n---\n doc/guides/prog_guide/gpudev.rst | 12 ++++++\n lib/gpudev/gpudev.c | 45 +++++++++++++++++++-\n lib/gpudev/gpudev_driver.h | 2 +-\n lib/gpudev/rte_gpudev.h | 71 +++++++++++++++++++++++++++++---\n lib/gpudev/version.map | 1 +\n 5 files changed, 123 insertions(+), 8 deletions(-)", "diff": "diff --git a/doc/guides/prog_guide/gpudev.rst b/doc/guides/prog_guide/gpudev.rst\nindex 6ea7239159..7694639489 100644\n--- a/doc/guides/prog_guide/gpudev.rst\n+++ b/doc/guides/prog_guide/gpudev.rst\n@@ -34,3 +34,15 @@ This library provides a number of features:\n \n API Overview\n ------------\n+\n+Child Device\n+~~~~~~~~~~~~\n+\n+By default, DPDK PCIe module detects and registers physical GPU devices\n+in the system.\n+With the gpudev library is also possible to add additional non-physical devices\n+through an ``uint64_t`` generic handler (e.g. CUDA Driver context)\n+that will be registered internally by the driver as an additional device (child)\n+connected to a physical device (parent).\n+Each device (parent or child) is represented through a ID\n+required to indicate which device a given operation should be executed on.\ndiff --git a/lib/gpudev/gpudev.c b/lib/gpudev/gpudev.c\nindex 07572ae040..aaf41e6071 100644\n--- a/lib/gpudev/gpudev.c\n+++ b/lib/gpudev/gpudev.c\n@@ -80,13 +80,22 @@ rte_gpu_is_valid(int16_t dev_id)\n \treturn false;\n }\n \n+static bool\n+gpu_match_parent(int16_t dev_id, int16_t parent)\n+{\n+\tif (parent == RTE_GPU_ID_ANY)\n+\t\treturn true;\n+\treturn gpus[dev_id].info.parent == parent;\n+}\n+\n int16_t\n-rte_gpu_find_next(int16_t dev_id)\n+rte_gpu_find_next(int16_t dev_id, int16_t parent)\n {\n \tif (dev_id < 0)\n \t\tdev_id = 0;\n \twhile (dev_id < gpu_max &&\n-\t\t\tgpus[dev_id].state == RTE_GPU_STATE_UNUSED)\n+\t\t\t(gpus[dev_id].state == RTE_GPU_STATE_UNUSED ||\n+\t\t\t!gpu_match_parent(dev_id, parent)))\n \t\tdev_id++;\n \n \tif (dev_id >= gpu_max)\n@@ -177,6 +186,7 @@ rte_gpu_allocate(const char *name)\n \tdev->info.name = dev->name;\n \tdev->info.dev_id = dev_id;\n \tdev->info.numa_node = -1;\n+\tdev->info.parent = RTE_GPU_ID_NONE;\n \tTAILQ_INIT(&dev->callbacks);\n \n \tgpu_count++;\n@@ -185,6 +195,28 @@ rte_gpu_allocate(const char *name)\n \treturn dev;\n }\n \n+int16_t\n+rte_gpu_add_child(const char *name, int16_t parent, uint64_t child_context)\n+{\n+\tstruct rte_gpu *dev;\n+\n+\tif (!rte_gpu_is_valid(parent)) {\n+\t\tGPU_LOG(ERR, \"add child to invalid parent ID %d\", parent);\n+\t\trte_errno = ENODEV;\n+\t\treturn -rte_errno;\n+\t}\n+\n+\tdev = rte_gpu_allocate(name);\n+\tif (dev == NULL)\n+\t\treturn -rte_errno;\n+\n+\tdev->info.parent = parent;\n+\tdev->info.context = child_context;\n+\n+\trte_gpu_complete_new(dev);\n+\treturn dev->info.dev_id;\n+}\n+\n void\n rte_gpu_complete_new(struct rte_gpu *dev)\n {\n@@ -199,10 +231,19 @@ rte_gpu_complete_new(struct rte_gpu *dev)\n int\n rte_gpu_release(struct rte_gpu *dev)\n {\n+\tint16_t dev_id, child;\n+\n \tif (dev == NULL) {\n \t\trte_errno = ENODEV;\n \t\treturn -rte_errno;\n \t}\n+\tdev_id = dev->info.dev_id;\n+\tRTE_GPU_FOREACH_CHILD(child, dev_id) {\n+\t\tGPU_LOG(ERR, \"cannot release device %d with child %d\",\n+\t\t\t\tdev_id, child);\n+\t\trte_errno = EBUSY;\n+\t\treturn -rte_errno;\n+\t}\n \n \tGPU_LOG(DEBUG, \"free device %s (id %d)\",\n \t\t\tdev->info.name, dev->info.dev_id);\ndiff --git a/lib/gpudev/gpudev_driver.h b/lib/gpudev/gpudev_driver.h\nindex 2a7089aa52..4d0077161c 100644\n--- a/lib/gpudev/gpudev_driver.h\n+++ b/lib/gpudev/gpudev_driver.h\n@@ -31,7 +31,7 @@ typedef int (rte_gpu_info_get_t)(struct rte_gpu *dev, struct rte_gpu_info *info)\n struct rte_gpu_ops {\n \t/* Get device info. If NULL, info is just copied. */\n \trte_gpu_info_get_t *dev_info_get;\n-\t/* Close device. */\n+\t/* Close device or child context. */\n \trte_gpu_close_t *dev_close;\n };\n \ndiff --git a/lib/gpudev/rte_gpudev.h b/lib/gpudev/rte_gpudev.h\nindex e1702fbfe4..df75dbdbab 100644\n--- a/lib/gpudev/rte_gpudev.h\n+++ b/lib/gpudev/rte_gpudev.h\n@@ -41,8 +41,12 @@ extern \"C\" {\n struct rte_gpu_info {\n \t/** Unique identifier name. */\n \tconst char *name;\n+\t/** Opaque handler of the device context. */\n+\tuint64_t context;\n \t/** Device ID. */\n \tint16_t dev_id;\n+\t/** ID of the parent device, RTE_GPU_ID_NONE if no parent */\n+\tint16_t parent;\n \t/** Total processors available on device. */\n \tuint32_t processor_count;\n \t/** Total memory available on device. */\n@@ -110,6 +114,33 @@ uint16_t rte_gpu_count_avail(void);\n __rte_experimental\n bool rte_gpu_is_valid(int16_t dev_id);\n \n+/**\n+ * @warning\n+ * @b EXPERIMENTAL: this API may change without prior notice.\n+ *\n+ * Create a virtual device representing a context in the parent device.\n+ *\n+ * @param name\n+ * Unique string to identify the device.\n+ * @param parent\n+ * Device ID of the parent.\n+ * @param child_context\n+ * Opaque context handler.\n+ *\n+ * @return\n+ * Device ID of the new created child, -rte_errno otherwise:\n+ * - EINVAL if empty name\n+ * - ENAMETOOLONG if long name\n+ * - EEXIST if existing device name\n+ * - ENODEV if invalid parent\n+ * - EPERM if secondary process\n+ * - ENOENT if too many devices\n+ * - ENOMEM if out of space\n+ */\n+__rte_experimental\n+int16_t rte_gpu_add_child(const char *name,\n+\t\tint16_t parent, uint64_t child_context);\n+\n /**\n * @warning\n * @b EXPERIMENTAL: this API may change without prior notice.\n@@ -118,13 +149,17 @@ bool rte_gpu_is_valid(int16_t dev_id);\n *\n * @param dev_id\n * The initial device ID to start the research.\n+ * @param parent\n+ * The device ID of the parent.\n+ * RTE_GPU_ID_NONE means no parent.\n+ * RTE_GPU_ID_ANY means no or any parent.\n *\n * @return\n * Next device ID corresponding to a valid and initialized computing device,\n * RTE_GPU_ID_NONE if there is none.\n */\n __rte_experimental\n-int16_t rte_gpu_find_next(int16_t dev_id);\n+int16_t rte_gpu_find_next(int16_t dev_id, int16_t parent);\n \n /**\n * @warning\n@@ -136,15 +171,41 @@ int16_t rte_gpu_find_next(int16_t dev_id);\n * The ID of the next possible valid device, usually 0 to iterate all.\n */\n #define RTE_GPU_FOREACH(dev_id) \\\n-\tfor (dev_id = rte_gpu_find_next(0); \\\n-\t dev_id > 0; \\\n-\t dev_id = rte_gpu_find_next(dev_id + 1))\n+\tRTE_GPU_FOREACH_CHILD(dev_id, RTE_GPU_ID_ANY)\n+\n+/**\n+ * @warning\n+ * @b EXPERIMENTAL: this API may change without prior notice.\n+ *\n+ * Macro to iterate over all valid computing devices having no parent.\n+ *\n+ * @param dev_id\n+ * The ID of the next possible valid device, usually 0 to iterate all.\n+ */\n+#define RTE_GPU_FOREACH_PARENT(dev_id) \\\n+\tRTE_GPU_FOREACH_CHILD(dev_id, RTE_GPU_ID_NONE)\n+\n+/**\n+ * @warning\n+ * @b EXPERIMENTAL: this API may change without prior notice.\n+ *\n+ * Macro to iterate over all valid children of a computing device parent.\n+ *\n+ * @param dev_id\n+ * The ID of the next possible valid device, usually 0 to iterate all.\n+ * @param parent\n+ * The device ID of the parent.\n+ */\n+#define RTE_GPU_FOREACH_CHILD(dev_id, parent) \\\n+\tfor (dev_id = rte_gpu_find_next(0, parent); \\\n+\t dev_id >= 0; \\\n+\t dev_id = rte_gpu_find_next(dev_id + 1, parent))\n \n /**\n * @warning\n * @b EXPERIMENTAL: this API may change without prior notice.\n *\n- * Close device.\n+ * Close device or child context.\n * All resources are released.\n *\n * @param dev_id\ndiff --git a/lib/gpudev/version.map b/lib/gpudev/version.map\nindex b3b6b76c1c..4a934ed933 100644\n--- a/lib/gpudev/version.map\n+++ b/lib/gpudev/version.map\n@@ -2,6 +2,7 @@ EXPERIMENTAL {\n \tglobal:\n \n \t# added in 21.11\n+\trte_gpu_add_child;\n \trte_gpu_callback_register;\n \trte_gpu_callback_unregister;\n \trte_gpu_close;\n", "prefixes": [ "v5", "3/9" ] }