Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> 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: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_debugfs.c | 3 ++-
> drivers/gpu/drm/i915/i915_drv.h | 30 +++++++++++------------
> drivers/gpu/drm/i915/intel_uncore.c | 48 ++++++++++++++++++++++++-------------
> 3 files changed, 48 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index 29bf11d8b620..fcac795d4396 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -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);
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 4c9de7d00eaf..589f91c4e585 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -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; \
> diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
> index aa2e7401efdc..2e79ca129202 100644
> --- a/drivers/gpu/drm/i915/intel_uncore.c
> +++ b/drivers/gpu/drm/i915/intel_uncore.c
> @@ -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;
> }
> @@ -308,7 +320,7 @@ static void intel_uncore_forcewake_reset(struct drm_i915_private *dev_priv,
> if (fw)
> dev_priv->uncore.funcs.force_wake_put(dev_priv, fw);
>
> - fw_domains_reset(dev_priv, FORCEWAKE_ALL);
> + fw_domains_reset(dev_priv, dev_priv->uncore.fw_domains);
>
> if (restore) { /* If reset with a user forcewake, try to restore */
> if (fw)
> @@ -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;
> @@ -1253,9 +1269,9 @@ static void intel_uncore_fw_domains_init(struct drm_i915_private *dev_priv)
> FORCEWAKE_MT, FORCEWAKE_MT_ACK);
>
> spin_lock_irq(&dev_priv->uncore.lock);
> - fw_domains_get_with_thread_status(dev_priv, FORCEWAKE_ALL);
> + fw_domains_get_with_thread_status(dev_priv, FORCEWAKE_RENDER);
Well we are skipping here the unused ones so I guess it fits
to the commit desc.
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
> ecobus = __raw_i915_read32(dev_priv, ECOBUS);
> - fw_domains_put_with_fifo(dev_priv, FORCEWAKE_ALL);
> + fw_domains_put_with_fifo(dev_priv, FORCEWAKE_RENDER);
> spin_unlock_irq(&dev_priv->uncore.lock);
>
> if (!(ecobus & FORCEWAKE_MT_ENABLE)) {
> --
> 2.11.0
>
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