diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_drv.h')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_drv.h | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index 30f791f89d64..9848e8eb0074 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -41,20 +41,21 @@ #include <drm/drm_atomic.h> /** - * _wait_for - magic (register) wait macro + * __wait_for - magic wait macro * - * Does the right thing for modeset paths when run under kdgb or similar atomic - * contexts. Note that it's important that we check the condition again after - * having timed out, since the timeout could be due to preemption or similar and - * we've never had a chance to check the condition before the timeout. + * Macro to help avoid open coding check/wait/timeout patterns. Note that it's + * important that we check the condition again after having timed out, since the + * timeout could be due to preemption or similar and we've never had a chance to + * check the condition before the timeout. */ -#define _wait_for(COND, US, Wmin, Wmax) ({ \ +#define __wait_for(OP, COND, US, Wmin, Wmax) ({ \ unsigned long timeout__ = jiffies + usecs_to_jiffies(US) + 1; \ long wait__ = (Wmin); /* recommended min for usleep is 10 us */ \ int ret__; \ might_sleep(); \ for (;;) { \ bool expired__ = time_after(jiffies, timeout__); \ + OP; \ if (COND) { \ ret__ = 0; \ break; \ @@ -70,7 +71,9 @@ ret__; \ }) -#define wait_for(COND, MS) _wait_for((COND), (MS) * 1000, 10, 1000) +#define _wait_for(COND, US, Wmin, Wmax) __wait_for(, (COND), (US), (Wmin), \ + (Wmax)) +#define wait_for(COND, MS) _wait_for((COND), (MS) * 1000, 10, 1000) /* If CONFIG_PREEMPT_COUNT is disabled, in_atomic() always reports false. */ #if defined(CONFIG_DRM_I915_DEBUG) && defined(CONFIG_PREEMPT_COUNT) |
