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drm/i915: Add a CMD_PARSER_VERSION getparam

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So userspace can query the kernel for command parser support.

v2: Add i915_cmd_parser_get_version(), history log, and kerneldoc

OTC-Tracker: AXIA-4631
Change-Id: I58af650db9f6753c2dcac9c54ab432fd31db302f
Signed-off-by: Brad Volkin <bradley.d.volkin@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Brad Volkin 2014-02-18 10:15:56 -08:00 committed by Daniel Vetter
parent 114d4f7008
commit d728c8ef8b
4 changed files with 24 additions and 0 deletions
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19
drivers/gpu/drm/i915/i915_cmd_parser.c
View File

@ -896,3 +896,22 @@ int i915_parse_cmds(struct intel_ring_buffer *ring,
return ret;
}
/**
* i915_cmd_parser_get_version() - get the cmd parser version number
*
* The cmd parser maintains a simple increasing integer version number suitable
* for passing to userspace clients to determine what operations are permitted.
*
* Return: the current version number of the cmd parser
*/
int i915_cmd_parser_get_version(void)
{
/*
* Command parser version history
*
* 1. Initial version. Checks batches and reports violations, but leaves
* hardware parsing enabled (so does not allow new use cases).
*/
return 1;
}

3
drivers/gpu/drm/i915/i915_dma.c
View File

@ -1017,6 +1017,9 @@ static int i915_getparam(struct drm_device *dev, void *data,
case I915_PARAM_HAS_EXEC_HANDLE_LUT:
value = 1;
break;
case I915_PARAM_CMD_PARSER_VERSION:
value = i915_cmd_parser_get_version();
break;
default:
DRM_DEBUG("Unknown parameter %d\n", param->param);
return -EINVAL;

1
drivers/gpu/drm/i915/i915_drv.h
View File

@ -2385,6 +2385,7 @@ void i915_get_extra_instdone(struct drm_device *dev, uint32_t *instdone);
const char *i915_cache_level_str(int type);
/* i915_cmd_parser.c */
int i915_cmd_parser_get_version(void);
void i915_cmd_parser_init_ring(struct intel_ring_buffer *ring);
bool i915_needs_cmd_parser(struct intel_ring_buffer *ring);
int i915_parse_cmds(struct intel_ring_buffer *ring,

1
include/uapi/drm/i915_drm.h
View File

@ -337,6 +337,7 @@ typedef struct drm_i915_irq_wait {
#define I915_PARAM_HAS_EXEC_NO_RELOC 25
#define I915_PARAM_HAS_EXEC_HANDLE_LUT 26
#define I915_PARAM_HAS_WT 27
#define I915_PARAM_CMD_PARSER_VERSION 28
typedef struct drm_i915_getparam {
int param;