Commit 59b7ed0b authored by Lucas De Marchi's avatar Lucas De Marchi
Browse files

drm/xe/configfs: Improve doc for ctx_restore* attributes 



Spell out the syntax instead of only using examples. Particularly
important the <engine-class> part since that's different than
engines_allowed and may confuse users. The same batch buffer is used for
all engines of a certain class.

Cc: Raag Jadav <raag.jadav@intel.com>
Reviewed-by: default avatarRaag Jadav <raag.jadav@intel.com>
Reviewed-by: default avatarJonathan Cavitt <jonathan.cavitt@intel.com>
Fixes: e2a9854d ("drm/xe/configfs: Allow to select by class only")
Link: https://lore.kernel.org/r/20250924152709.659483-4-lucas.demarchi@intel.com


Signed-off-by: default avatarLucas De Marchi <lucas.demarchi@intel.com>
(cherry picked from commit 47ca7acf)
Signed-off-by: default avatarLucas De Marchi <lucas.demarchi@intel.com>
parent 7646423c

drivers/gpu/drm/xe/xe_configfs.c

+16 −3
Original line number Diff line number Diff line
@@ -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

 * ==============