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drm/i915: the intel gtt is _not_ an agp bridge! 

So don't call it like that.

Also rip out a confusing comment and instead explain what's really
going on.

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter 2012-03-26 09:45:41 +02:00
parent 644ec02b5d
commit 9021f284e9
1 changed files with 9 additions and 15 deletions
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24
drivers/gpu/drm/i915/i915_dma.c
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@ -1957,7 +1957,7 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
{
struct drm_i915_private *dev_priv;
int ret = 0, mmio_bar;
uint32_t agp_size;
uint32_t aperture_size;
/* i915 has 4 more counters */
dev->counters += 4;
@ -2011,16 +2011,16 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
goto out_rmmap;
}
agp_size = dev_priv->mm.gtt->gtt_mappable_entries << PAGE_SHIFT;
aperture_size = dev_priv->mm.gtt->gtt_mappable_entries << PAGE_SHIFT;
dev_priv->mm.gtt_mapping =
io_mapping_create_wc(dev->agp->base, agp_size);
io_mapping_create_wc(dev->agp->base, aperture_size);
if (dev_priv->mm.gtt_mapping == NULL) {
ret = -EIO;
goto out_rmmap;
}
i915_mtrr_setup(dev_priv, dev->agp->base, agp_size);
i915_mtrr_setup(dev_priv, dev->agp->base, aperture_size);
/* The i915 workqueue is primarily used for batched retirement of
* requests (and thus managing bo) once the task has been completed
@ -2272,7 +2272,7 @@ int i915_driver_open(struct drm_device *dev, struct drm_file *file)
* mode setting case, we want to restore the kernel's initial mode (just
* in case the last client left us in a bad state).
*
* Additionally, in the non-mode setting case, we'll tear down the AGP
* Additionally, in the non-mode setting case, we'll tear down the GTT
* and DMA structures, since the kernel won't be using them, and clea
* up any GEM state.
*/
@ -2350,16 +2350,10 @@ struct drm_ioctl_desc i915_ioctls[] = {
int i915_max_ioctl = DRM_ARRAY_SIZE(i915_ioctls);
/**
* Determine if the device really is AGP or not.
*
* All Intel graphics chipsets are treated as AGP, even if they are really
* PCI-e.
*
* \param dev The device to be tested.
*
* \returns
* A value of 1 is always retured to indictate every i9x5 is AGP.
/*
* This is really ugly: Because old userspace abused the linux agp interface to
* manage the gtt, we need to claim that all intel devices are agp. For
* otherwise the drm core refuses to initialize the agp support code.
*/
int i915_driver_device_is_agp(struct drm_device * dev)
{