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drm/i915: Use the precomputed value for whether to enable command parsing 

As i915.enable_cmd_parser is an unsafe option, make it read-only at
runtime. Now that it is constant, we can use the value determined during
initialisation as to whether we need the cmdparser at execbuffer time.

v2: Remove the inline for its single user, it is clear enough (and
shorter) without!

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161124125851.6615-1-chris@chris-wilson.co.uk
hifive-unleashed-5.1
Chris Wilson 2016-11-24 12:58:51 +00:00
parent 9607ae7971
commit 41736a8e33
5 changed files with 6 additions and 28 deletions
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23
drivers/gpu/drm/i915/i915_cmd_parser.c
View File

@ -1131,27 +1131,6 @@ unpin_src:
return dst;
}
/**
* intel_engine_needs_cmd_parser() - should a given engine use software
* command parsing?
* @engine: the engine in question
*
* Only certain platforms require software batch buffer command parsing, and
* only when enabled via module parameter.
*
* Return: true if the engine requires software command parsing
*/
bool intel_engine_needs_cmd_parser(struct intel_engine_cs *engine)
{
if (!engine->needs_cmd_parser)
return false;
if (!USES_PPGTT(engine->i915))
return false;
return (i915.enable_cmd_parser == 1);
}
static bool check_cmd(const struct intel_engine_cs *engine,
const struct drm_i915_cmd_descriptor *desc,
const u32 *cmd, u32 length,
@ -1375,7 +1354,7 @@ int i915_cmd_parser_get_version(struct drm_i915_private *dev_priv)
/* If the command parser is not enabled, report 0 - unsupported */
for_each_engine(engine, dev_priv, id) {
if (intel_engine_needs_cmd_parser(engine)) {
if (engine->needs_cmd_parser) {
active = true;
break;
}

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

@ -3452,7 +3452,6 @@ const char *i915_cache_level_str(struct drm_i915_private *i915, int type);
int i915_cmd_parser_get_version(struct drm_i915_private *dev_priv);
void intel_engine_init_cmd_parser(struct intel_engine_cs *engine);
void intel_engine_cleanup_cmd_parser(struct intel_engine_cs *engine);
bool intel_engine_needs_cmd_parser(struct intel_engine_cs *engine);
int intel_engine_cmd_parser(struct intel_engine_cs *engine,
struct drm_i915_gem_object *batch_obj,
struct drm_i915_gem_object *shadow_batch_obj,

2
drivers/gpu/drm/i915/i915_gem_execbuffer.c
View File

@ -1713,7 +1713,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
}
params->args_batch_start_offset = args->batch_start_offset;
if (intel_engine_needs_cmd_parser(engine) && args->batch_len) {
if (engine->needs_cmd_parser && args->batch_len) {
struct i915_vma *vma;
vma = i915_gem_execbuffer_parse(engine, &shadow_exec_entry,

6
drivers/gpu/drm/i915/i915_params.c
View File

@ -50,7 +50,7 @@ struct i915_params i915 __read_mostly = {
.error_capture = true,
.invert_brightness = 0,
.disable_display = 0,
.enable_cmd_parser = 1,
.enable_cmd_parser = true,
.use_mmio_flip = 0,
.mmio_debug = 0,
.verbose_state_checks = 1,
@ -188,9 +188,9 @@ MODULE_PARM_DESC(invert_brightness,
module_param_named(disable_display, i915.disable_display, bool, 0400);
MODULE_PARM_DESC(disable_display, "Disable display (default: false)");
module_param_named_unsafe(enable_cmd_parser, i915.enable_cmd_parser, int, 0600);
module_param_named_unsafe(enable_cmd_parser, i915.enable_cmd_parser, bool, 0400);
MODULE_PARM_DESC(enable_cmd_parser,
"Enable command parsing (1=enabled [default], 0=disabled)");
"Enable command parsing (true=enabled [default], false=disabled)");
module_param_named_unsafe(use_mmio_flip, i915.use_mmio_flip, int, 0600);
MODULE_PARM_DESC(use_mmio_flip,

2
drivers/gpu/drm/i915/i915_params.h
View File

@ -44,7 +44,6 @@ struct i915_params {
int disable_power_well;
int enable_ips;
int invert_brightness;
int enable_cmd_parser;
int enable_guc_loading;
int enable_guc_submission;
int guc_log_level;
@ -53,6 +52,7 @@ struct i915_params {
int edp_vswing;
unsigned int inject_load_failure;
/* leave bools at the end to not create holes */
bool enable_cmd_parser;
bool enable_hangcheck;
bool fastboot;
bool prefault_disable;