On 07/21/2015 01:16 PM, Chris Wilson wrote:
userptr requires mmu-notifier for full unprivileged support. Most
systems have mmu-notifier support already enabled as a requirement for
virtualisation support, but we should make the option for i915 to take
advantage of mmu-notifiers explicit (and enable by default so that
regular userspace can take advantage of passing client memory to the
GPU.)
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/Kconfig | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
index eb87e2538861..1e33195e4a12 100644
--- a/drivers/gpu/drm/i915/Kconfig
+++ b/drivers/gpu/drm/i915/Kconfig
@@ -62,3 +62,14 @@ config DRM_I915_PRELIMINARY_HW_SUPPORT
option changes the default for that module option.
If in doubt, say "N".
+
+config DRM_I915_USERPTR
+ bool "Always enable userptr support"
+ depends on DRM_I915
+ select MMU_NOTIFIER
+ default y
+ help
+ This option selects CONFIG_MMU_NOTIFIER if it isn't already
+ selected to enabled full userptr support.
s/enabled/enable/
I think it needs more text under help to explain what are you giving up
if N, or to justify Y in other words. For distro kernels it is
irrelevant but advanced users will want to know.
But since overall I think it is justified, in principle:
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Regards,
Tvrtko
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