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Date:	Mon, 14 Jul 2014 11:21:43 +0200
From:	Daniel Vetter <daniel.vetter@...ll.ch>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	John Stultz <john.stultz@...aro.org>,
	Peter Zijlstra <peterz@...radead.org>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>
Subject: Re: [patch 48/55] drm: i915: Use nsec based interfaces

On Fri, Jul 11, 2014 at 3:45 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
> No point in converting timespecs back and forth.
>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: Daniel Vetter <daniel.vetter@...ll.ch>

I guess simplest to merge together with the new ktime_get_raw_ns.
Acked-by: me for that.
-Daniel

> ---
>  drivers/gpu/drm/i915/i915_drv.h |    2 +-
>  drivers/gpu/drm/i915/i915_gem.c |   33 ++++++++++++---------------------
>  drivers/gpu/drm/i915/intel_pm.c |   12 +++++-------
>  3 files changed, 18 insertions(+), 29 deletions(-)
>
> Index: tip/drivers/gpu/drm/i915/i915_drv.h
> ===================================================================
> --- tip.orig/drivers/gpu/drm/i915/i915_drv.h
> +++ tip/drivers/gpu/drm/i915/i915_drv.h
> @@ -931,7 +931,7 @@ struct intel_ilk_power_mgmt {
>         unsigned long last_time1;
>         unsigned long chipset_power;
>         u64 last_count2;
> -       struct timespec last_time2;
> +       u64 last_time2;
>         unsigned long gfx_power;
>         u8 corr;
>
> Index: tip/drivers/gpu/drm/i915/i915_gem.c
> ===================================================================
> --- tip.orig/drivers/gpu/drm/i915/i915_gem.c
> +++ tip/drivers/gpu/drm/i915/i915_gem.c
> @@ -1149,16 +1149,16 @@ static bool can_wait_boost(struct drm_i9
>  static int __wait_seqno(struct intel_engine_cs *ring, u32 seqno,
>                         unsigned reset_counter,
>                         bool interruptible,
> -                       struct timespec *timeout,
> +                       s64 *timeout,
>                         struct drm_i915_file_private *file_priv)
>  {
>         struct drm_device *dev = ring->dev;
>         struct drm_i915_private *dev_priv = dev->dev_private;
>         const bool irq_test_in_progress =
>                 ACCESS_ONCE(dev_priv->gpu_error.test_irq_rings) & intel_ring_flag(ring);
> -       struct timespec before, now;
>         DEFINE_WAIT(wait);
>         unsigned long timeout_expire;
> +       s64 before, now;
>         int ret;
>
>         WARN(dev_priv->pm.irqs_disabled, "IRQs disabled\n");
> @@ -1166,7 +1166,7 @@ static int __wait_seqno(struct intel_eng
>         if (i915_seqno_passed(ring->get_seqno(ring, true), seqno))
>                 return 0;
>
> -       timeout_expire = timeout ? jiffies + timespec_to_jiffies_timeout(timeout) : 0;
> +       timeout_expire = timeout ? jiffies + nsecs_to_jiffies((u64)timeout) : 0;
>
>         if (INTEL_INFO(dev)->gen >= 6 && can_wait_boost(file_priv)) {
>                 gen6_rps_boost(dev_priv);
> @@ -1181,7 +1181,7 @@ static int __wait_seqno(struct intel_eng
>
>         /* Record current time in case interrupted by signal, or wedged */
>         trace_i915_gem_request_wait_begin(ring, seqno);
> -       getrawmonotonic(&before);
> +       before = ktime_get_raw_ns();
>         for (;;) {
>                 struct timer_list timer;
>
> @@ -1230,7 +1230,7 @@ static int __wait_seqno(struct intel_eng
>                         destroy_timer_on_stack(&timer);
>                 }
>         }
> -       getrawmonotonic(&now);
> +       now = ktime_get_raw_ns();
>         trace_i915_gem_request_wait_end(ring, seqno);
>
>         if (!irq_test_in_progress)
> @@ -1239,10 +1239,9 @@ static int __wait_seqno(struct intel_eng
>         finish_wait(&ring->irq_queue, &wait);
>
>         if (timeout) {
> -               struct timespec sleep_time = timespec_sub(now, before);
> -               *timeout = timespec_sub(*timeout, sleep_time);
> -               if (!timespec_valid(timeout)) /* i.e. negative time remains */
> -                       set_normalized_timespec(timeout, 0, 0);
> +               s64 tres = *timeout - (now - before);
> +
> +               *timeout = tres < 0 ? 0 : tres;
>         }
>
>         return ret;
> @@ -2753,16 +2752,10 @@ i915_gem_wait_ioctl(struct drm_device *d
>         struct drm_i915_gem_wait *args = data;
>         struct drm_i915_gem_object *obj;
>         struct intel_engine_cs *ring = NULL;
> -       struct timespec timeout_stack, *timeout = NULL;
>         unsigned reset_counter;
>         u32 seqno = 0;
>         int ret = 0;
>
> -       if (args->timeout_ns >= 0) {
> -               timeout_stack = ns_to_timespec(args->timeout_ns);
> -               timeout = &timeout_stack;
> -       }
> -
>         ret = i915_mutex_lock_interruptible(dev);
>         if (ret)
>                 return ret;
> @@ -2787,9 +2780,9 @@ i915_gem_wait_ioctl(struct drm_device *d
>                  goto out;
>
>         /* Do this after OLR check to make sure we make forward progress polling
> -        * on this IOCTL with a 0 timeout (like busy ioctl)
> +        * on this IOCTL with a timeout <=0 (like busy ioctl)
>          */
> -       if (!args->timeout_ns) {
> +       if (args->timeout_ns <= 0) {
>                 ret = -ETIME;
>                 goto out;
>         }
> @@ -2798,10 +2791,8 @@ i915_gem_wait_ioctl(struct drm_device *d
>         reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter);
>         mutex_unlock(&dev->struct_mutex);
>
> -       ret = __wait_seqno(ring, seqno, reset_counter, true, timeout, file->driver_priv);
> -       if (timeout)
> -               args->timeout_ns = timespec_to_ns(timeout);
> -       return ret;
> +       return __wait_seqno(ring, seqno, reset_counter, true, &args->timeout_ns,
> +                           file->driver_priv);
>
>  out:
>         drm_gem_object_unreference(&obj->base);
> Index: tip/drivers/gpu/drm/i915/intel_pm.c
> ===================================================================
> --- tip.orig/drivers/gpu/drm/i915/intel_pm.c
> +++ tip/drivers/gpu/drm/i915/intel_pm.c
> @@ -2993,7 +2993,7 @@ static void ironlake_enable_drps(struct
>                 I915_READ(0x112e0);
>         dev_priv->ips.last_time1 = jiffies_to_msecs(jiffies);
>         dev_priv->ips.last_count2 = I915_READ(0x112f4);
> -       getrawmonotonic(&dev_priv->ips.last_time2);
> +       dev_priv->ips.last_time2 = ktime_get_raw_ns();
>
>         spin_unlock_irq(&mchdev_lock);
>  }
> @@ -4314,18 +4314,16 @@ static u16 pvid_to_extvid(struct drm_i91
>
>  static void __i915_update_gfx_val(struct drm_i915_private *dev_priv)
>  {
> -       struct timespec now, diff1;
> -       u64 diff;
> -       unsigned long diffms;
> +       u64 now, diff, diffms;
>         u32 count;
>
>         assert_spin_locked(&mchdev_lock);
>
> -       getrawmonotonic(&now);
> -       diff1 = timespec_sub(now, dev_priv->ips.last_time2);
> +       now = ktime_get_raw_ns();
> +       diffms = now - dev_priv->ips.last_time2;
> +       do_div(diffms, NSEC_PER_MSEC);
>
>         /* Don't divide by 0 */
> -       diffms = diff1.tv_sec * 1000 + diff1.tv_nsec / 1000000;
>         if (!diffms)
>                 return;
>
>
>



-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
--
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