From: Chris Wilson Date: Sun, 26 Nov 2017 21:48:56 +0000 (+0000) Subject: drm/i915: Flush everything on switching to the kernel_context X-Git-Tag: v4.19~298^2~46^2~1001 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c82297fcfaff2862686094061772070e6763e00c;p=platform%2Fkernel%2Flinux-rpi3.git 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 Cc: Joonas Lahtinen Link: https://patchwork.freedesktop.org/patch/msgid/20171126214856.23702-1-chris@chris-wilson.co.uk Reviewed-by: Joonas Lahtinen --- diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c index aee0f6d..ce3139e 100644 --- a/drivers/gpu/drm/i915/i915_gem_context.c +++ b/drivers/gpu/drm/i915/i915_gem_context.c @@ -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;