return -1;
}
+static int
+gpu_mem_cpu_map(uint16_t gpu_id)
+{
+ void *ptr_gpu = NULL;
+ void *ptr_cpu = NULL;
+ size_t buf_bytes = 1024;
+ unsigned int align = 4096;
+ int ret;
+
+ printf("\n=======> TEST: Map GPU memory for CPU visibility\n\n");
+
+ /* Alloc memory on GPU 0 with 4kB alignment */
+ ptr_gpu = rte_gpu_mem_alloc(gpu_id, buf_bytes, align);
+ if (ptr_gpu == NULL) {
+ fprintf(stderr, "rte_gpu_mem_alloc GPU memory returned error\n");
+ goto error;
+ }
+ printf("GPU memory allocated at 0x%p size is %zd bytes\n",
+ ptr_gpu, buf_bytes);
+
+ ptr_cpu = rte_gpu_mem_cpu_map(gpu_id, buf_bytes, ptr_gpu);
+ if (ptr_cpu == NULL) {
+ fprintf(stderr, "rte_gpu_mem_cpu_map returned error\n");
+ goto error;
+ }
+ printf("GPU memory mapped for CPU access at 0x%p\n", ptr_cpu);
+
+ ((uint8_t *)ptr_cpu)[0] = 0x4;
+ ((uint8_t *)ptr_cpu)[1] = 0x5;
+ ((uint8_t *)ptr_cpu)[2] = 0x6;
+
+ printf("GPU memory first 3 bytes set from CPU: %x %x %x\n",
+ ((uint8_t *)ptr_cpu)[0],
+ ((uint8_t *)ptr_cpu)[1],
+ ((uint8_t *)ptr_cpu)[2]);
+
+ ret = rte_gpu_mem_cpu_unmap(gpu_id, ptr_cpu);
+ if (ret < 0) {
+ fprintf(stderr, "rte_gpu_mem_cpu_unmap returned error %d\n", ret);
+ goto error;
+ }
+ printf("GPU memory mapped for CPU access at 0x%p\n", ptr_cpu);
+
+ ret = rte_gpu_mem_free(gpu_id, ptr_gpu);
+ if (ret < 0) {
+ fprintf(stderr, "rte_gpu_mem_free returned error %d\n", ret);
+ goto error;
+ }
+ printf("GPU memory 0x%p freed\n", ptr_gpu);
+
+ printf("\n=======> TEST: PASSED\n");
+ return 0;
+
+error:
+
+ rte_gpu_mem_cpu_unmap(gpu_id, ptr_cpu);
+ rte_gpu_mem_free(gpu_id, ptr_gpu);
+
+ printf("\n=======> TEST: FAILED\n");
+ return -1;
+}
+
static int
create_update_comm_flag(uint16_t gpu_id)
{
*/
alloc_gpu_memory(gpu_id);
register_cpu_memory(gpu_id);
+ gpu_mem_cpu_map(gpu_id);
/**
* Communication items test
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
~~~~~~~~~~~~~~
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);
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)
{
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 {
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;
};
__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.
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;
};
git.droids-corp.org / dpdk.git / commitdiff