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drm/i915: Set up an MTRR covering the GTT at driver load.

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We'd love to just be using PAT, but even on chips with PAT it gets disabled
sometimes due to an errata.  It would probably be better to have pat_enabled
exported and only bother with this when !pat_enabled.

Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@linux.ie>
This commit is contained in:
Eric Anholt 2009-01-23 12:57:47 -08:00 committed by Dave Airlie
parent 725e30ad66
commit ab657db12d
3 changed files with 25 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
drivers/gpu/drm/i915/i915_dma.c
View File

@ -966,10 +966,6 @@ static int i915_load_modeset_init(struct drm_device *dev)
if (ret)
goto kfree_devname;
dev_priv->mm.gtt_mapping =
io_mapping_create_wc(dev->agp->base,
dev->agp->agp_info.aper_size * 1024*1024);
/* Allow hardware batchbuffers unless told otherwise.
*/
dev_priv->allow_batchbuffer = 1;
@ -1081,6 +1077,23 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
goto free_priv;
}
dev_priv->mm.gtt_mapping =
io_mapping_create_wc(dev->agp->base,
dev->agp->agp_info.aper_size * 1024*1024);
/* Set up a WC MTRR for non-PAT systems. This is more common than
* one would think, because the kernel disables PAT on first
* generation Core chips because WC PAT gets overridden by a UC
* MTRR if present. Even if a UC MTRR isn't present.
*/
dev_priv->mm.gtt_mtrr = mtrr_add(dev->agp->base,
dev->agp->agp_info.aper_size *
1024 * 1024,
MTRR_TYPE_WRCOMB, 1);
if (dev_priv->mm.gtt_mtrr < 0) {
DRM_INFO("MTRR allocation failed\n. Graphics "
"performance may suffer.\n");
}
#ifdef CONFIG_HIGHMEM64G
/* don't enable GEM on PAE - needs agp + set_memory_* interface fixes */
dev_priv->has_gem = 0;
@ -1145,8 +1158,14 @@ int i915_driver_unload(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
io_mapping_free(dev_priv->mm.gtt_mapping);
if (dev_priv->mm.gtt_mtrr >= 0) {
mtrr_del(dev_priv->mm.gtt_mtrr, dev->agp->base,
dev->agp->agp_info.aper_size * 1024 * 1024);
dev_priv->mm.gtt_mtrr = -1;
}
if (drm_core_check_feature(dev, DRIVER_MODESET)) {
io_mapping_free(dev_priv->mm.gtt_mapping);
drm_irq_uninstall(dev);
}

1
drivers/gpu/drm/i915/i915_drv.h
View File

@ -284,6 +284,7 @@ typedef struct drm_i915_private {
struct drm_mm gtt_space;
struct io_mapping *gtt_mapping;
int gtt_mtrr;
/**
* List of objects currently involved in rendering from the

6
drivers/gpu/drm/i915/i915_gem.c
View File

@ -3229,10 +3229,6 @@ i915_gem_entervt_ioctl(struct drm_device *dev, void *data,
dev_priv->mm.wedged = 0;
}
dev_priv->mm.gtt_mapping = io_mapping_create_wc(dev->agp->base,
dev->agp->agp_info.aper_size
* 1024 * 1024);
mutex_lock(&dev->struct_mutex);
dev_priv->mm.suspended = 0;
@ -3255,7 +3251,6 @@ int
i915_gem_leavevt_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
drm_i915_private_t *dev_priv = dev->dev_private;
int ret;
if (drm_core_check_feature(dev, DRIVER_MODESET))
@ -3264,7 +3259,6 @@ i915_gem_leavevt_ioctl(struct drm_device *dev, void *data,
ret = i915_gem_idle(dev);
drm_irq_uninstall(dev);
io_mapping_free(dev_priv->mm.gtt_mapping);
return ret;
}