> -----Original Message----- > From: Daniel Vetter [mailto:daniel.vet...@ffwll.ch] > Sent: Monday, August 04, 2014 3:19 PM > To: Intel Graphics Development > Cc: Daniel Vetter; Thierry, Michel; Ville Syrjälä > Subject: [PATCH] drm/i915: Initialize the aliasing ppgtt as part of global gtt > > Stuffing this into the context setup code doesn't make a lot of sense. > Also reusing the real ppgtt setup code makes even less sense since the > aliasing ppgtt isn't a real address space. Leaving all that stuff > unitialized will make sure that we catch any abusers promptly. > > This is also a prep work to clean up the context->ppgtt link. > > v2: Fix up the logic fail, I've fumbled it so badly to completely > disable ppgtt on gen6. Spotted by Ville and Michel. Also move around > the pde write into the gen6 init function, since otherwise it won't > work at all. > > Cc: "Thierry, Michel" <michel.thie...@intel.com> > Cc: Ville Syrjälä <ville.syrj...@linux.intel.com> > Signed-off-by: Daniel Vetter <daniel.vet...@ffwll.ch> > --- > drivers/gpu/drm/i915/i915_gem_context.c | 13 +--------- > drivers/gpu/drm/i915/i915_gem_gtt.c | 42 +++++++++++++++++++++++- > --------- > 2 files changed, 31 insertions(+), 24 deletions(-) > > diff --git a/drivers/gpu/drm/i915/i915_gem_context.c > b/drivers/gpu/drm/i915/i915_gem_context.c > index 3b8367aa8404..7a455fcee3a7 100644 > --- a/drivers/gpu/drm/i915/i915_gem_context.c > +++ b/drivers/gpu/drm/i915/i915_gem_context.c > @@ -276,17 +276,6 @@ i915_gem_create_context(struct drm_device *dev, > goto err_unpin; > } else > ctx->vm = &ppgtt->base; > - > - /* This case is reserved for the global default context and > - * should only happen once. */ > - if (is_global_default_ctx) { > - if (WARN_ON(dev_priv->mm.aliasing_ppgtt)) { > - ret = -EEXIST; > - goto err_unpin; > - } > - > - dev_priv->mm.aliasing_ppgtt = ppgtt; > - }
I expect some problems with full ppgtt & this (in some places, the driver is
still making some decisions based on dev_priv->mm.aliasing_ppgtt, which now
will be null).
Should I address these problems in a subsequent patch?
> } else if (USES_PPGTT(dev)) {
> /* For platforms which only have aliasing PPGTT, we fake the
> * address space and refcounting. */
> @@ -361,7 +350,7 @@ int i915_gem_context_init(struct drm_device *dev)
> }
> }
>
> - ctx = i915_gem_create_context(dev, NULL, USES_PPGTT(dev));
> + ctx = i915_gem_create_context(dev, NULL,
> USES_FULL_PPGTT(dev));
> if (IS_ERR(ctx)) {
> DRM_ERROR("Failed to create default global context (error
> %ld)\n",
> PTR_ERR(ctx));
> }
>
> --
> 1.9.3
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