opal/accelerator: Add IPC APIs

Signed-off-by: William Zhang <[email protected]>

Author: wckzhang

opal/mca/accelerator/accelerator.h

@@ -309,6 +309,71 @@ typedef int (*opal_accelerator_base_module_mem_release_fn_t)(
 typedef int (*opal_accelerator_base_module_get_address_range_fn_t)(
     int dev_id, const void *ptr, void **base, size_t *size);
 
+/**
+ * Queries whether the device supports Inter Process Communication
+ * or not. If true, the functions:
+ *
+ * opal_accelerator_base_module_get_ipc_handle_size_fn_t()
+ * opal_accelerator_base_module_get_ipc_handle_fn_t()
+ * opal_accelerator_base_module_open_ipc_handle_fn_t()
+ * opal_accelerator_base_module_close_ipc_handle_fn_t()
+ *
+ * must be implemented.
+ *
+ * @return true              IPC supported
+ * @return false             IPC not supported
+ */
+typedef bool (*opal_accelerator_base_module_is_ipc_enabled_fn_t)(void);
+
+/**
+ * Returns the size of the Inter Process Communication memory handle
+ *
+ * @return size_t            Size of the IPC memory handle
+ */
+typedef size_t (*opal_accelerator_base_module_get_ipc_handle_size_fn_t)(void);
+
+/**
+ * Gets an interprocess memory handle for an existing device memory allocation.
+ *
+ * @param[IN] dev_id         Associated device for the IPC memory handle or
+ *                           MCA_ACCELERATOR_NO_DEVICE_ID
+ * @param[IN] dev_ptr        Base pointer to previously allocated device
+ *                           memory
+ * @param[OUT] handle        Pointer to user allocated mem handle to return
+ *                           the memory handle in.
+ *
+ * @return                   OPAL_SUCCESS or error status on failure
+ *
+ */
+typedef int (*opal_accelerator_base_module_get_ipc_handle_fn_t)(
+    int dev_id, void *dev_ptr, void **handle);
+
+/**
+ * Opens an interprocess memory handle from another process and returns
+ * a device pointer usable in the local process.
+ *
+ * @param[IN] dev_id         Associated device for the IPC memory handle or
+ *                           MCA_ACCELERATOR_NO_DEVICE_ID
+ * @param[IN] handle         IPC memory handle from another process
+ * @param[IN] dev_id         Device ID associated with the IPC memory handle
+ * @param[OUT] dev_ptr       Returned device pointer
+ *
+ * @return                   OPAL_SUCCESS or error status on failure
+ */
+typedef int (*opal_accelerator_base_module_open_ipc_handle_fn_t)(
+    int dev_id, void *handle, void **dev_ptr);
+
+/**
+ * Closes memory mapped with opal_accelerator_base_module_open_ipc_handle_fn_t().
+ *
+ * @param[IN] dev_id         Associated device for the IPC memory handle or
+ *                           MCA_ACCELERATOR_NO_DEVICE_ID
+ * @param[IN] dev_ptr            IPC device pointer returned from
+ *                               opal_accelerator_base_module_open_ipc_handle_fn_t()
+ */
+typedef int (*opal_accelerator_base_module_close_ipc_handle_fn_t)(
+    int dev_id, void *dev_ptr);
+
 /**
  * Page-locks the memory range specified by ptr and size
  *
@@ -394,6 +459,12 @@ typedef struct {
     opal_accelerator_base_module_mem_release_fn_t mem_release;
     opal_accelerator_base_module_get_address_range_fn_t get_address_range;
 
+    opal_accelerator_base_module_is_ipc_enabled_fn_t is_ipc_enabled;
+    opal_accelerator_base_module_get_ipc_handle_size_fn_t get_ipc_handle_size;
+    opal_accelerator_base_module_get_ipc_handle_fn_t get_ipc_handle;
+    opal_accelerator_base_module_open_ipc_handle_fn_t open_ipc_handle;
+    opal_accelerator_base_module_close_ipc_handle_fn_t close_ipc_handle;
+
     opal_accelerator_base_module_host_register_fn_t host_register;
     opal_accelerator_base_module_host_unregister_fn_t host_unregister;