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dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=nvidia.com; Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 12.22.5.238 as permitted sender) receiver=protection.outlook.com; client-ip=12.22.5.238; helo=mail.nvidia.com; Received: from mail.nvidia.com (12.22.5.238) by DM6NAM11FT017.mail.protection.outlook.com (10.13.172.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.20.4930.15 via Frontend Transport; Wed, 26 Jan 2022 19:40:45 +0000 Received: from rnnvmail201.nvidia.com (10.129.68.8) by DRHQMAIL105.nvidia.com (10.27.9.14) with Microsoft SMTP Server (TLS) id 15.0.1497.18; Wed, 26 Jan 2022 19:40:44 +0000 Received: from nvidia.com (10.126.230.35) by rnnvmail201.nvidia.com (10.129.68.8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.9; Wed, 26 Jan 2022 11:40:43 -0800 From: To: CC: Elena Agostini Subject: [PATCH v5 1/2] gpudev: expose GPU memory to CPU Date: Thu, 27 Jan 2022 03:50:28 +0000 Message-ID: <20220127035029.12920-1-eagostini@nvidia.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220104023408.13379-1-eagostini@nvidia.com> References: <20220104023408.13379-1-eagostini@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.126.230.35] X-ClientProxiedBy: drhqmail202.nvidia.com (10.126.190.181) To rnnvmail201.nvidia.com (10.129.68.8) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 0ec8a66f-1537-4684-556c-08d9e103bf22 X-MS-TrafficTypeDiagnostic: SJ0PR12MB5609:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:9508; 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GPU memory has to be allocated via rte_gpu_mem_alloc(). This patch allows the gpudev library to map (and unmap), through the GPU driver, a chunk of GPU memory and to return a memory pointer usable by the CPU to access the GPU memory area. Signed-off-by: Elena Agostini --- doc/guides/prog_guide/gpudev.rst | 9 +++++ drivers/gpu/cuda/cuda.c | 2 ++ lib/gpudev/gpudev.c | 61 ++++++++++++++++++++++++++++++++ lib/gpudev/gpudev_driver.h | 6 ++++ lib/gpudev/rte_gpudev.h | 49 +++++++++++++++++++++++++ lib/gpudev/version.map | 2 ++ 6 files changed, 129 insertions(+) diff --git a/doc/guides/prog_guide/gpudev.rst b/doc/guides/prog_guide/gpudev.rst index ff4626812b..b774ec77f9 100644 --- a/doc/guides/prog_guide/gpudev.rst +++ b/doc/guides/prog_guide/gpudev.rst @@ -73,6 +73,15 @@ Later, it's also possible to unregister that memory with gpudev. CPU memory registered outside of the gpudev library (e.g. with GPU specific library) cannot be unregistered by the gpudev library. +CPU mapping +~~~~~~~~~~~~~~~~~~~ + +gpudev can map into the CPU address space a GPU memory address allocated with gpudev. +gpudev returns a pointer the CPU can use to access (ready or write) GPU memory. +Later, it's also possible to unmap that memory with gpudev. +GPU memory CPU mapped outside of the gpudev library (e.g. with GPU specific library) +cannot be unmapped by the gpudev library. + Memory Barrier ~~~~~~~~~~~~~~ diff --git a/drivers/gpu/cuda/cuda.c b/drivers/gpu/cuda/cuda.c index 0ece1bb612..408b659fce 100644 --- a/drivers/gpu/cuda/cuda.c +++ b/drivers/gpu/cuda/cuda.c @@ -1177,6 +1177,8 @@ cuda_gpu_probe(__rte_unused struct rte_pci_driver *pci_drv, struct rte_pci_devic dev->ops.mem_free = cuda_mem_free; dev->ops.mem_register = cuda_mem_register; dev->ops.mem_unregister = cuda_mem_unregister; + dev->ops.mem_cpu_map = NULL; + dev->ops.mem_cpu_unmap = NULL; dev->ops.wmb = cuda_wmb; rte_gpu_complete_new(dev); diff --git a/lib/gpudev/gpudev.c b/lib/gpudev/gpudev.c index 59e2169292..ce92d63257 100644 --- a/lib/gpudev/gpudev.c +++ b/lib/gpudev/gpudev.c @@ -640,6 +640,67 @@ rte_gpu_mem_unregister(int16_t dev_id, void *ptr) return GPU_DRV_RET(dev->ops.mem_unregister(dev, ptr)); } +void * +rte_gpu_mem_cpu_map(int16_t dev_id, size_t size, void *ptr) +{ + struct rte_gpu *dev; + void *ptr_out; + int ret; + + dev = gpu_get_by_id(dev_id); + if (dev == NULL) { + GPU_LOG(ERR, "mem CPU map for invalid device ID %d", dev_id); + rte_errno = ENODEV; + return NULL; + } + + if (dev->ops.mem_cpu_map == NULL) { + GPU_LOG(ERR, "mem CPU map not supported"); + rte_errno = ENOTSUP; + return NULL; + } + + if (ptr == NULL || size == 0) /* dry-run */ + return NULL; + + ret = GPU_DRV_RET(dev->ops.mem_cpu_map(dev, size, ptr, &ptr_out)); + + switch (ret) { + case 0: + return ptr_out; + case -ENOMEM: + case -E2BIG: + rte_errno = -ret; + return NULL; + default: + rte_errno = -EPERM; + return NULL; + } +} + +int +rte_gpu_mem_cpu_unmap(int16_t dev_id, void *ptr) +{ + struct rte_gpu *dev; + + dev = gpu_get_by_id(dev_id); + if (dev == NULL) { + GPU_LOG(ERR, "cpu_unmap mem for invalid device ID %d", dev_id); + rte_errno = ENODEV; + return -rte_errno; + } + + if (dev->ops.mem_cpu_unmap == NULL) { + rte_errno = ENOTSUP; + return -rte_errno; + } + + if (ptr == NULL) /* dry-run */ + return 0; + + return GPU_DRV_RET(dev->ops.mem_cpu_unmap(dev, ptr)); +} + int rte_gpu_wmb(int16_t dev_id) { diff --git a/lib/gpudev/gpudev_driver.h b/lib/gpudev/gpudev_driver.h index 0ed7478e9b..0e55b00bfe 100644 --- a/lib/gpudev/gpudev_driver.h +++ b/lib/gpudev/gpudev_driver.h @@ -31,6 +31,8 @@ typedef int (rte_gpu_mem_alloc_t)(struct rte_gpu *dev, size_t size, unsigned int typedef int (rte_gpu_mem_free_t)(struct rte_gpu *dev, void *ptr); typedef int (rte_gpu_mem_register_t)(struct rte_gpu *dev, size_t size, void *ptr); typedef int (rte_gpu_mem_unregister_t)(struct rte_gpu *dev, void *ptr); +typedef int (rte_gpu_mem_cpu_map_t)(struct rte_gpu *dev, size_t size, void *ptr_in, void **ptr_out); +typedef int (rte_gpu_mem_cpu_unmap_t)(struct rte_gpu *dev, void *ptr); typedef int (rte_gpu_wmb_t)(struct rte_gpu *dev); struct rte_gpu_ops { @@ -46,6 +48,10 @@ struct rte_gpu_ops { rte_gpu_mem_register_t *mem_register; /* Unregister CPU memory from device. */ rte_gpu_mem_unregister_t *mem_unregister; + /* Map GPU memory for CPU visibility. */ + rte_gpu_mem_cpu_map_t *mem_cpu_map; + /* Unmap GPU memory for CPU visibility. */ + rte_gpu_mem_cpu_unmap_t *mem_cpu_unmap; /* Enforce GPU write memory barrier. */ rte_gpu_wmb_t *wmb; }; diff --git a/lib/gpudev/rte_gpudev.h b/lib/gpudev/rte_gpudev.h index ff3ca78c89..5cc4eb5828 100644 --- a/lib/gpudev/rte_gpudev.h +++ b/lib/gpudev/rte_gpudev.h @@ -452,6 +452,55 @@ int rte_gpu_mem_register(int16_t dev_id, size_t size, void *ptr); __rte_experimental int rte_gpu_mem_unregister(int16_t dev_id, void *ptr); +/** + * @warning + * @b EXPERIMENTAL: this API may change without prior notice. + * + * Map a chunk of GPU memory to make it accessible from the CPU + * using the memory pointer returned by the function. + * GPU memory has to be allocated via rte_gpu_mem_alloc(). + * + * @param dev_id + * Device ID requiring mapped memory. + * @param size + * Number of bytes to map. + * Requesting 0 will do nothing. + * @param ptr + * Pointer to the GPU memory area to be mapped. + * NULL is a no-op accepted value. + + * @return + * A pointer to the mapped GPU memory usable by the CPU, otherwise NULL and rte_errno is set: + * - ENODEV if invalid dev_id + * - ENOTSUP if operation not supported by the driver + * - E2BIG if size is higher than limit + * - ENOMEM if out of space + * - EPERM if driver error + */ +__rte_experimental +void *rte_gpu_mem_cpu_map(int16_t dev_id, size_t size, void *ptr); + +/** + * @warning + * @b EXPERIMENTAL: this API may change without prior notice. + * + * Unmap a chunk of GPU memory previously mapped with rte_gpu_mem_cpu_map() + * + * @param dev_id + * Reference device ID. + * @param ptr + * Pointer to the memory area to be unmapped. + * NULL is a no-op accepted value. + * + * @return + * 0 on success, -rte_errno otherwise: + * - ENODEV if invalid dev_id + * - ENOTSUP if operation not supported by the driver + * - EPERM if driver error + */ +__rte_experimental +int rte_gpu_mem_cpu_unmap(int16_t dev_id, void *ptr); + /** * @warning * @b EXPERIMENTAL: this API may change without prior notice. diff --git a/lib/gpudev/version.map b/lib/gpudev/version.map index 2e414c65cc..5bc5d154cd 100644 --- a/lib/gpudev/version.map +++ b/lib/gpudev/version.map @@ -20,8 +20,10 @@ EXPERIMENTAL { rte_gpu_init; rte_gpu_is_valid; rte_gpu_mem_alloc; + rte_gpu_mem_cpu_map; rte_gpu_mem_free; rte_gpu_mem_register; + rte_gpu_mem_cpu_unmap; rte_gpu_mem_unregister; rte_gpu_wmb; }; -- 2.17.1