[PATCH] drm/i915: Convert timers to use timer_setup()

* [PATCH] drm/i915: Convert timers to use timer_setup()
@ 2017-10-16 22:55 ` Kees Cook
  0 siblings, 0 replies; 11+ messages in thread
From: Kees Cook @ 2017-10-16 22:55 UTC (permalink / raw)
  To: Daniel Vetter
  Cc: Jani Nikula, David Airlie, Chris Wilson, Joonas Lahtinen,
	Tvrtko Ursulin, Oscar Mateo, intel-gfx, dri-devel, linux-kernel

In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly.

Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Oscar Mateo <oscar.mateo@intel.com>
Cc: intel-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> # for mock_engine
---
This patch includes additional timers since the last time it was sent.
---
 drivers/gpu/drm/i915/i915_sw_fence.c         |  8 +++-----
 drivers/gpu/drm/i915/intel_breadcrumbs.c     | 18 ++++++++----------
 drivers/gpu/drm/i915/selftests/mock_engine.c |  8 +++-----
 3 files changed, 14 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_sw_fence.c b/drivers/gpu/drm/i915/i915_sw_fence.c
index ca33cc08cb07..e8ca67a129d2 100644
--- a/drivers/gpu/drm/i915/i915_sw_fence.c
+++ b/drivers/gpu/drm/i915/i915_sw_fence.c
@@ -369,9 +369,9 @@ struct i915_sw_dma_fence_cb {
 	struct irq_work work;
 };
 
-static void timer_i915_sw_fence_wake(unsigned long data)
+static void timer_i915_sw_fence_wake(struct timer_list *t)
 {
-	struct i915_sw_dma_fence_cb *cb = (struct i915_sw_dma_fence_cb *)data;
+	struct i915_sw_dma_fence_cb *cb = from_timer(cb, t, timer);
 	struct i915_sw_fence *fence;
 
 	fence = xchg(&cb->fence, NULL);
@@ -434,9 +434,7 @@ int i915_sw_fence_await_dma_fence(struct i915_sw_fence *fence,
 	i915_sw_fence_await(fence);
 
 	cb->dma = NULL;
-	__setup_timer(&cb->timer,
-		      timer_i915_sw_fence_wake, (unsigned long)cb,
-		      TIMER_IRQSAFE);
+	timer_setup(&cb->timer, timer_i915_sw_fence_wake, TIMER_IRQSAFE);
 	init_irq_work(&cb->work, irq_i915_sw_fence_work);
 	if (timeout) {
 		cb->dma = dma_fence_get(dma);
diff --git a/drivers/gpu/drm/i915/intel_breadcrumbs.c b/drivers/gpu/drm/i915/intel_breadcrumbs.c
index 29c62d481cef..48e1ba01ccf8 100644
--- a/drivers/gpu/drm/i915/intel_breadcrumbs.c
+++ b/drivers/gpu/drm/i915/intel_breadcrumbs.c
@@ -74,9 +74,10 @@ static noinline void missed_breadcrumb(struct intel_engine_cs *engine)
 	set_bit(engine->id, &engine->i915->gpu_error.missed_irq_rings);
 }
 
-static void intel_breadcrumbs_hangcheck(unsigned long data)
+static void intel_breadcrumbs_hangcheck(struct timer_list *t)
 {
-	struct intel_engine_cs *engine = (struct intel_engine_cs *)data;
+	struct intel_engine_cs *engine = from_timer(engine, t,
+						    breadcrumbs.hangcheck);
 	struct intel_breadcrumbs *b = &engine->breadcrumbs;
 
 	if (!b->irq_armed)
@@ -108,9 +109,10 @@ static void intel_breadcrumbs_hangcheck(unsigned long data)
 	}
 }
 
-static void intel_breadcrumbs_fake_irq(unsigned long data)
+static void intel_breadcrumbs_fake_irq(struct timer_list *t)
 {
-	struct intel_engine_cs *engine = (struct intel_engine_cs *)data;
+	struct intel_engine_cs *engine = from_timer(engine, t,
+						    breadcrumbs.fake_irq);
 	struct intel_breadcrumbs *b = &engine->breadcrumbs;
 
 	/* The timer persists in case we cannot enable interrupts,
@@ -787,12 +789,8 @@ int intel_engine_init_breadcrumbs(struct intel_engine_cs *engine)
 	spin_lock_init(&b->rb_lock);
 	spin_lock_init(&b->irq_lock);
 
-	setup_timer(&b->fake_irq,
-		    intel_breadcrumbs_fake_irq,
-		    (unsigned long)engine);
-	setup_timer(&b->hangcheck,
-		    intel_breadcrumbs_hangcheck,
-		    (unsigned long)engine);
+	timer_setup(&b->fake_irq, intel_breadcrumbs_fake_irq, 0);
+	timer_setup(&b->hangcheck, intel_breadcrumbs_hangcheck, 0);
 
 	/* Spawn a thread to provide a common bottom-half for all signals.
 	 * As this is an asynchronous interface we cannot steal the current
diff --git a/drivers/gpu/drm/i915/selftests/mock_engine.c b/drivers/gpu/drm/i915/selftests/mock_engine.c
index fc0fd7498689..331c2b09869e 100644
--- a/drivers/gpu/drm/i915/selftests/mock_engine.c
+++ b/drivers/gpu/drm/i915/selftests/mock_engine.c
@@ -32,9 +32,9 @@ static struct mock_request *first_request(struct mock_engine *engine)
 					link);
 }
 
-static void hw_delay_complete(unsigned long data)
+static void hw_delay_complete(struct timer_list *t)
 {
-	struct mock_engine *engine = (typeof(engine))data;
+	struct mock_engine *engine = from_timer(engine, t, hw_delay);
 	struct mock_request *request;
 
 	spin_lock(&engine->hw_lock);
@@ -161,9 +161,7 @@ struct intel_engine_cs *mock_engine(struct drm_i915_private *i915,
 
 	/* fake hw queue */
 	spin_lock_init(&engine->hw_lock);
-	setup_timer(&engine->hw_delay,
-		    hw_delay_complete,
-		    (unsigned long)engine);
+	timer_setup(&engine->hw_delay, hw_delay_complete, 0);
 	INIT_LIST_HEAD(&engine->hw_queue);
 
 	return &engine->base;
-- 
2.7.4


-- 
Kees Cook
Pixel Security

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