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Commit d2dc94bc authored by Chris Wilson's avatar Chris Wilson
Browse files

drm/i915: Skip unused fw_domains 



Use find-first-set bitop to quickly scan through the fw_domains mask and
skip iterating over unused domains.

v2: Move the WARN into the caller, to prevent compiler warnings in
normal builds.

Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: default avatarMika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170323101944.21627-4-chris@chris-wilson.co.uk
parent cb3600db

drivers/gpu/drm/i915/i915_debugfs.c

+2 −1
Original line number Diff line number Diff line
@@ -1461,9 +1461,10 @@ static int i915_forcewake_domains(struct seq_file *m, void *data) 
{

	struct drm_i915_private *dev_priv = node_to_i915(m->private);

	struct intel_uncore_forcewake_domain *fw_domain;

	unsigned int tmp;



	spin_lock_irq(&dev_priv->uncore.lock);

	for_each_fw_domain(fw_domain, dev_priv) {

	for_each_fw_domain(fw_domain, dev_priv, tmp) {

		seq_printf(m, "%s.wake_count = %u\n",

			   intel_uncore_forcewake_domain_to_str(fw_domain->id),

			   fw_domain->wake_count);

drivers/gpu/drm/i915/i915_drv.h

+14 −16
Original line number Diff line number Diff line
@@ -703,9 +703,9 @@ enum forcewake_domain_id { 
};



enum forcewake_domains {

	FORCEWAKE_RENDER = (1 << FW_DOMAIN_ID_RENDER),

	FORCEWAKE_BLITTER = (1 << FW_DOMAIN_ID_BLITTER),

	FORCEWAKE_MEDIA	= (1 << FW_DOMAIN_ID_MEDIA),

	FORCEWAKE_RENDER = BIT(FW_DOMAIN_ID_RENDER),

	FORCEWAKE_BLITTER = BIT(FW_DOMAIN_ID_BLITTER),

	FORCEWAKE_MEDIA	= BIT(FW_DOMAIN_ID_MEDIA),

	FORCEWAKE_ALL = (FORCEWAKE_RENDER |

			 FORCEWAKE_BLITTER |

			 FORCEWAKE_MEDIA)
@@ -790,15 +790,19 @@ struct intel_uncore { 
	int unclaimed_mmio_check;

};



#define __mask_next_bit(mask) ({					\

	int __idx = ffs(mask) - 1;					\

	mask &= ~BIT(__idx);						\

	__idx;								\

})



/* Iterate over initialised fw domains */

#define for_each_fw_domain_masked(domain__, mask__, dev_priv__) \

	for ((domain__) = &(dev_priv__)->uncore.fw_domain[0]; \

	     (domain__) < &(dev_priv__)->uncore.fw_domain[FW_DOMAIN_ID_COUNT]; \

	     (domain__)++) \

		for_each_if ((mask__) & (domain__)->mask)

#define for_each_fw_domain_masked(domain__, mask__, dev_priv__, tmp__) \

	for (tmp__ = (mask__); \

	     tmp__ ? (domain__ = &(dev_priv__)->uncore.fw_domain[__mask_next_bit(tmp__)]), 1 : 0;)



#define for_each_fw_domain(domain__, dev_priv__) \

	for_each_fw_domain_masked(domain__, FORCEWAKE_ALL, dev_priv__)

#define for_each_fw_domain(domain__, dev_priv__, tmp__) \

	for_each_fw_domain_masked(domain__, (dev_priv__)->uncore.fw_domains, dev_priv__, tmp__)



#define CSR_VERSION(major, minor)	((major) << 16 | (minor))

#define CSR_VERSION_MAJOR(version)	((version) >> 16)
@@ -2581,12 +2585,6 @@ static inline struct drm_i915_private *huc_to_i915(struct intel_huc *huc) 
	     (id__)++) \

		for_each_if ((engine__) = (dev_priv__)->engine[(id__)])



#define __mask_next_bit(mask) ({					\

	int __idx = ffs(mask) - 1;					\

	mask &= ~BIT(__idx);						\

	__idx;								\

})



/* Iterator over subset of engines selected by mask */

#define for_each_engine_masked(engine__, dev_priv__, mask__, tmp__) \

	for (tmp__ = mask__ & INTEL_INFO(dev_priv__)->ring_mask;	\

drivers/gpu/drm/i915/intel_uncore.c

+29 −13
Original line number Diff line number Diff line
@@ -118,13 +118,16 @@ static void 
fw_domains_get(struct drm_i915_private *i915, enum forcewake_domains fw_domains)

{

	struct intel_uncore_forcewake_domain *d;

	unsigned int tmp;



	GEM_BUG_ON(fw_domains & ~i915->uncore.fw_domains);



	for_each_fw_domain_masked(d, fw_domains, i915) {

	for_each_fw_domain_masked(d, fw_domains, i915, tmp) {

		fw_domain_wait_ack_clear(i915, d);

		fw_domain_get(i915, d);

	}



	for_each_fw_domain_masked(d, fw_domains, i915)

	for_each_fw_domain_masked(d, fw_domains, i915, tmp)

		fw_domain_wait_ack(i915, d);



	i915->uncore.fw_domains_active |= fw_domains;
@@ -134,8 +137,11 @@ static void 
fw_domains_put(struct drm_i915_private *i915, enum forcewake_domains fw_domains)

{

	struct intel_uncore_forcewake_domain *d;

	unsigned int tmp;



	GEM_BUG_ON(fw_domains & ~i915->uncore.fw_domains);



	for_each_fw_domain_masked(d, fw_domains, i915) {

	for_each_fw_domain_masked(d, fw_domains, i915, tmp) {

		fw_domain_put(i915, d);

		fw_domain_posting_read(i915, d);

	}
@@ -147,9 +153,10 @@ static void 
fw_domains_posting_read(struct drm_i915_private *i915)

{

	struct intel_uncore_forcewake_domain *d;

	unsigned int tmp;



	/* No need to do for all, just do for first found */

	for_each_fw_domain(d, i915) {

	for_each_fw_domain(d, i915, tmp) {

		fw_domain_posting_read(i915, d);

		break;

	}
@@ -160,11 +167,14 @@ fw_domains_reset(struct drm_i915_private *i915, 
		 enum forcewake_domains fw_domains)

{

	struct intel_uncore_forcewake_domain *d;

	unsigned int tmp;



	if (i915->uncore.fw_domains == 0)

	if (!fw_domains)

		return;



	for_each_fw_domain_masked(d, fw_domains, i915)

	GEM_BUG_ON(fw_domains & ~i915->uncore.fw_domains);



	for_each_fw_domain_masked(d, fw_domains, i915, tmp)

		fw_domain_reset(i915, d);



	fw_domains_posting_read(i915);
@@ -274,9 +284,11 @@ static void intel_uncore_forcewake_reset(struct drm_i915_private *dev_priv, 
	 * timers are run before holding.

	 */

	while (1) {

		unsigned int tmp;



		active_domains = 0;



		for_each_fw_domain(domain, dev_priv) {

		for_each_fw_domain(domain, dev_priv, tmp) {

			if (hrtimer_cancel(&domain->timer) == 0)

				continue;
@@ -285,7 +297,7 @@ static void intel_uncore_forcewake_reset(struct drm_i915_private *dev_priv, 


		spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);



		for_each_fw_domain(domain, dev_priv) {

		for_each_fw_domain(domain, dev_priv, tmp) {

			if (hrtimer_active(&domain->timer))

				active_domains |= domain->mask;

		}
@@ -465,13 +477,13 @@ static void __intel_uncore_forcewake_get(struct drm_i915_private *dev_priv, 
					 enum forcewake_domains fw_domains)

{

	struct intel_uncore_forcewake_domain *domain;

	unsigned int tmp;



	fw_domains &= dev_priv->uncore.fw_domains;



	for_each_fw_domain_masked(domain, fw_domains, dev_priv) {

	for_each_fw_domain_masked(domain, fw_domains, dev_priv, tmp)

		if (domain->wake_count++)

			fw_domains &= ~domain->mask;

	}



	if (fw_domains)

		dev_priv->uncore.funcs.force_wake_get(dev_priv, fw_domains);
@@ -528,10 +540,11 @@ static void __intel_uncore_forcewake_put(struct drm_i915_private *dev_priv, 
					 enum forcewake_domains fw_domains)

{

	struct intel_uncore_forcewake_domain *domain;

	unsigned int tmp;



	fw_domains &= dev_priv->uncore.fw_domains;



	for_each_fw_domain_masked(domain, fw_domains, dev_priv) {

	for_each_fw_domain_masked(domain, fw_domains, dev_priv, tmp) {

		if (WARN_ON(domain->wake_count == 0))

			continue;
@@ -936,8 +949,11 @@ static noinline void ___force_wake_auto(struct drm_i915_private *dev_priv, 
					enum forcewake_domains fw_domains)

{

	struct intel_uncore_forcewake_domain *domain;

	unsigned int tmp;



	GEM_BUG_ON(fw_domains & ~dev_priv->uncore.fw_domains);



	for_each_fw_domain_masked(domain, fw_domains, dev_priv)

	for_each_fw_domain_masked(domain, fw_domains, dev_priv, tmp)

		fw_domain_arm_timer(domain);



	dev_priv->uncore.funcs.force_wake_get(dev_priv, fw_domains);
@@ -1175,7 +1191,7 @@ static void fw_domain_init(struct drm_i915_private *dev_priv, 
	BUILD_BUG_ON(FORCEWAKE_BLITTER != (1 << FW_DOMAIN_ID_BLITTER));

	BUILD_BUG_ON(FORCEWAKE_MEDIA != (1 << FW_DOMAIN_ID_MEDIA));



	d->mask = 1 << domain_id;

	d->mask = BIT(domain_id);



	hrtimer_init(&d->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);

	d->timer.function = intel_uncore_fw_release_timer;