From 09ac4fcb3f255e9225967c75f5893325c116cdbe Mon Sep 17 00:00:00 2001 From: Felix Kuehling Date: Thu, 13 Jul 2017 17:01:16 -0400 Subject: drm/ttm: Implement vm_operations_struct.access v2 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Allows gdb to access contents of user mode mapped BOs. System memory is handled by TTM using kmap. Other memory pools require a new driver callback in ttm_bo_driver. v2: * kmap only one page at a time * swap in BO if needed * make driver callback more generic to handle private memory pools * document callback return value * WARN_ON -> WARN_ON_ONCE Signed-off-by: Felix Kuehling Reviewed-by: Christian König Reviewed-by: Michel Dänzer Signed-off-by: Alex Deucher --- include/drm/ttm/ttm_bo_driver.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'include/drm') diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h index 990d529f823c..d30850e07936 100644 --- a/include/drm/ttm/ttm_bo_driver.h +++ b/include/drm/ttm/ttm_bo_driver.h @@ -472,6 +472,23 @@ struct ttm_bo_driver { */ unsigned long (*io_mem_pfn)(struct ttm_buffer_object *bo, unsigned long page_offset); + + /** + * Read/write memory buffers for ptrace access + * + * @bo: the BO to access + * @offset: the offset from the start of the BO + * @buf: pointer to source/destination buffer + * @len: number of bytes to copy + * @write: whether to read (0) from or write (non-0) to BO + * + * If successful, this function should return the number of + * bytes copied, -EIO otherwise. If the number of bytes + * returned is < len, the function may be called again with + * the remainder of the buffer to copy. + */ + int (*access_memory)(struct ttm_buffer_object *bo, unsigned long offset, + void *buf, int len, int write); }; /** -- cgit v1.2.3