diff options
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/xe/xe_configfs.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/drivers/gpu/drm/xe/xe_configfs.c b/drivers/gpu/drm/xe/xe_configfs.c index beade13efbae..139663423185 100644 --- a/drivers/gpu/drm/xe/xe_configfs.c +++ b/drivers/gpu/drm/xe/xe_configfs.c @@ -126,8 +126,20 @@ * not intended for normal execution and will taint the kernel with TAINT_TEST * when used. * - * Currently this is implemented only for post and mid context restore. - * Examples: + * The syntax allows to pass straight instructions to be executed by the engine + * in a batch buffer or set specific registers. + * + * #. Generic instruction:: + * + * <engine-class> cmd <instr> [[dword0] [dword1] [...]] + * + * #. Simple register setting:: + * + * <engine-class> reg <address> <value> + * + * Commands are saved per engine class: all instances of that class will execute + * those commands during context switch. The instruction, dword arguments, + * addresses and values are in hex format like in the examples below. * * #. Execute a LRI command to write 0xDEADBEEF to register 0x4f10 after the * normal context restore:: @@ -154,7 +166,8 @@ * When using multiple lines, make sure to use a command that is * implemented with a single write syscall, like HEREDOC. * - * These attributes can only be set before binding to the device. + * Currently this is implemented only for post and mid context restore and + * these attributes can only be set before binding to the device. * * Remove devices * ============== |