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drm/i915: Flush everything on switching to the kernel_context 

Even though all rendering should have been flushed at the end of the
previous requests, add an extra flush after switching to the
kernel_context. As the switch to the kernel_context is used when idling
the gpu (e.g. suspend), having an extra layer of paranoia to ensure
everything is flushed to memory seems sensible.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171126214856.23702-1-chris@chris-wilson.co.uk
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
This commit is contained in:
Chris Wilson 2017-11-26 21:48:56 +00:00
parent fd94d53e55
commit c82297fcfa
1 changed files with 8 additions and 1 deletions
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9
drivers/gpu/drm/i915/i915_gem_context.c
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@ -620,7 +620,14 @@ int i915_gem_switch_to_kernel_context(struct drm_i915_private *dev_priv)
GFP_KERNEL);
}
i915_add_request(req);
/*
* Force a flush after the switch to ensure that all rendering
* and operations prior to switching to the kernel context hits
* memory. This should be guaranteed by the previous request,
* but an extra layer of paranoia before we declare the system
* idle (on suspend etc) is advisable!
*/
__i915_add_request(req, true);
}
return 0;