[Intel-gfx] [PATCH v2] drm/i915: Use atomic waits for short non-atomic ones

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

usleep_range is not recommended for waits shorten than 10us.

Make the wait_for_us use the atomic variant for such waits.

To do so we need to reimplement the _wait_for_atomic macro to
be safe with regards to preemption and interrupts.

v2: Reimplement _wait_for_atomic to be irq and preemption safe.
    (Chris Wilson and Imre Deak)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Imre Deak <imre.deak at intel.com>
Cc: Mika Kuoppala <mika.kuoppala at intel.com>
---
 drivers/gpu/drm/i915/intel_drv.h | 46 ++++++++++++++++++++++++++++------------
 1 file changed, 32 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 3156d8df7921..a200fd2be908 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -69,7 +69,6 @@
 })
 
 #define wait_for(COND, MS)	  	_wait_for((COND), (MS) * 1000, 1000)
-#define wait_for_us(COND, US)	  	_wait_for((COND), (US), 1)
 
 /* If CONFIG_PREEMPT_COUNT is disabled, in_atomic() always reports false. */
 #if defined(CONFIG_DRM_I915_DEBUG) && defined(CONFIG_PREEMPT_COUNT)
@@ -78,25 +77,44 @@
 # define _WAIT_FOR_ATOMIC_CHECK do { } while (0)
 #endif
 
-#define _wait_for_atomic(COND, US) ({ \
-	unsigned long end__; \
-	int ret__ = 0; \
+#define _wait_for_atomic(COND, US) \
+({ \
+	int cpu, ret, timeout = (US) * 1000; \
+	u64 base; \
 	_WAIT_FOR_ATOMIC_CHECK; \
 	BUILD_BUG_ON((US) > 50000); \
-	end__ = (local_clock() >> 10) + (US) + 1; \
-	while (!(COND)) { \
-		if (time_after((unsigned long)(local_clock() >> 10), end__)) { \
-			/* Unlike the regular wait_for(), this atomic variant \
-			 * cannot be preempted (and we'll just ignore the issue\
-			 * of irq interruptions) and so we know that no time \
-			 * has passed since the last check of COND and can \
-			 * immediately report the timeout. \
-			 */ \
-			ret__ = -ETIMEDOUT; \
+	preempt_disable(); \
+	cpu = smp_processor_id(); \
+	base = local_clock(); \
+	for (;;) { \
+		u64 now = local_clock(); \
+		preempt_enable(); \
+		if (COND) { \
+			ret = 0; \
+			break; \
+		} \
+		if (now - base >= timeout) { \
+			ret = -ETIMEDOUT; \
 			break; \
 		} \
 		cpu_relax(); \
+		preempt_disable(); \
+		if (unlikely(cpu != smp_processor_id())) { \
+			timeout -= now - base; \
+			cpu = smp_processor_id(); \
+			base = local_clock(); \
+		} \
 	} \
+	ret; \
+})
+
+#define wait_for_us(COND, US) \
+({ \
+	int ret__; \
+	if ((US) > 10) \
+		ret__ = _wait_for((COND), (US), 10); \
+	else \
+		ret__ = _wait_for_atomic((COND), (US)); \
 	ret__; \
 })
 
-- 
1.9.1