From 28176ef4cfa510e5f1498bbf39ff1e4afd0b085d Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Fri, 28 Oct 2016 13:58:56 +0100 Subject: drm/i915: Reserve space in the global seqno during request allocation A restriction on our global seqno is that they cannot wrap, and that we cannot use the value 0. This allows us to detect when a request has not yet been submitted, its global seqno is still 0, and ensures that hardware semaphores are monotonic as required by older hardware. To meet these restrictions when we defer the assignment of the global seqno, we must check that we have an available slot in the global seqno space during request construction. If that test fails, we wait for all requests to be completed and reset the hardware back to 0. Signed-off-by: Chris Wilson Reviewed-by: Joonas Lahtinen Link: http://patchwork.freedesktop.org/patch/msgid/20161028125858.23563-33-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/i915_debugfs.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'drivers/gpu/drm/i915/i915_debugfs.c') diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index 1723a1f5b20e..9bef6f55f99d 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -552,7 +552,7 @@ static int i915_gem_pageflip_info(struct seq_file *m, void *data) seq_printf(m, "Flip queued on %s at seqno %x, next seqno %x [current breadcrumb %x], completed? %d\n", engine->name, i915_gem_request_get_seqno(work->flip_queued_req), - dev_priv->gt.global_timeline.next_seqno, + atomic_read(&dev_priv->gt.global_timeline.next_seqno), intel_engine_get_seqno(engine), i915_gem_request_completed(work->flip_queued_req)); } else @@ -1046,7 +1046,7 @@ i915_next_seqno_get(void *data, u64 *val) { struct drm_i915_private *dev_priv = data; - *val = READ_ONCE(dev_priv->gt.global_timeline.next_seqno); + *val = atomic_read(&dev_priv->gt.global_timeline.next_seqno); return 0; } @@ -2277,8 +2277,8 @@ static int i915_rps_boost_info(struct seq_file *m, void *data) struct drm_file *file; seq_printf(m, "RPS enabled? %d\n", dev_priv->rps.enabled); - seq_printf(m, "GPU busy? %s [%x]\n", - yesno(dev_priv->gt.awake), dev_priv->gt.active_engines); + seq_printf(m, "GPU busy? %s [%d requests]\n", + yesno(dev_priv->gt.awake), dev_priv->gt.active_requests); seq_printf(m, "CPU waiting? %d\n", count_irq_waiters(dev_priv)); seq_printf(m, "Frequency requested %d\n", intel_gpu_freq(dev_priv, dev_priv->rps.cur_freq)); @@ -2313,7 +2313,7 @@ static int i915_rps_boost_info(struct seq_file *m, void *data) if (INTEL_GEN(dev_priv) >= 6 && dev_priv->rps.enabled && - dev_priv->gt.active_engines) { + dev_priv->gt.active_requests) { u32 rpup, rpupei; u32 rpdown, rpdownei; -- cgit v1.2.3