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| author |  Chris Wilson <chris@chris-wilson.co.uk>
| 2016-10-28 13:58:56 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk>
| 2016-10-28 20:53:56 +0100 |
| commit | 28176ef4cfa510e5f1498bbf39ff1e4afd0b085d (patch) | |
| tree | 65e94485cfbda077bc642d2e7fbf1a2d291a323d /drivers/gpu/drm/i915/i915_drv.h | |
| parent | drm/i915: Convert breadcrumbs spinlock to be irqsafe (diff) | |
| download | linux-28176ef4cfa510e5f1498bbf39ff1e4afd0b085d.tar.gz linux-28176ef4cfa510e5f1498bbf39ff1e4afd0b085d.tar.bz2 linux-28176ef4cfa510e5f1498bbf39ff1e4afd0b085d.zip | |
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 <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161028125858.23563-33-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/i915_drv.h')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_drv.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 8b987f772d47..eacb144af29e 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -2092,6 +2092,7 @@ struct drm_i915_private { struct list_head timelines; struct i915_gem_timeline global_timeline; + u32 active_requests; /** * Is the GPU currently considered idle, or busy executing @@ -2100,7 +2101,6 @@ struct drm_i915_private { * In order to reduce the effect on performance, there * is a slight delay before we do so. */ - unsigned int active_engines; bool awake; /** |