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i915: Initialize hardware status page at device load when possible.

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Some chips were unstable with repeated setup/teardown of the hardware status
page.

Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Keith Packard 2008-07-30 13:03:43 -07:00 committed by Dave Airlie
parent d3a6d4467c
commit 398c9cb20b
1 changed files with 57 additions and 29 deletions
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86
drivers/gpu/drm/i915/i915_dma.c
View file

@ -71,6 +71,52 @@ int i915_wait_ring(struct drm_device * dev, int n, const char *caller)
return -EBUSY;
}
/**
* Sets up the hardware status page for devices that need a physical address
* in the register.
*/
int i915_init_phys_hws(struct drm_device *dev)
{
drm_i915_private_t *dev_priv = dev->dev_private;
/* Program Hardware Status Page */
dev_priv->status_page_dmah =
drm_pci_alloc(dev, PAGE_SIZE, PAGE_SIZE, 0xffffffff);
if (!dev_priv->status_page_dmah) {
DRM_ERROR("Can not allocate hardware status page\n");
return -ENOMEM;
}
dev_priv->hw_status_page = dev_priv->status_page_dmah->vaddr;
dev_priv->dma_status_page = dev_priv->status_page_dmah->busaddr;
memset(dev_priv->hw_status_page, 0, PAGE_SIZE);
I915_WRITE(HWS_PGA, dev_priv->dma_status_page);
DRM_DEBUG("Enabled hardware status page\n");
return 0;
}
/**
* Frees the hardware status page, whether it's a physical address or a virtual
* address set up by the X Server.
*/
void i915_free_hws(struct drm_device *dev)
{
drm_i915_private_t *dev_priv = dev->dev_private;
if (dev_priv->status_page_dmah) {
drm_pci_free(dev, dev_priv->status_page_dmah);
dev_priv->status_page_dmah = NULL;
}
if (dev_priv->status_gfx_addr) {
dev_priv->status_gfx_addr = 0;
drm_core_ioremapfree(&dev_priv->hws_map, dev);
}
/* Need to rewrite hardware status page */
I915_WRITE(HWS_PGA, 0x1ffff000);
}
void i915_kernel_lost_context(struct drm_device * dev)
{
drm_i915_private_t *dev_priv = dev->dev_private;
@ -103,18 +149,9 @@ static int i915_dma_cleanup(struct drm_device * dev)
dev_priv->ring.map.size = 0;
}
if (dev_priv->status_page_dmah) {
drm_pci_free(dev, dev_priv->status_page_dmah);
dev_priv->status_page_dmah = NULL;
/* Need to rewrite hardware status page */
I915_WRITE(HWS_PGA, 0x1ffff000);
}
if (dev_priv->status_gfx_addr) {
dev_priv->status_gfx_addr = 0;
drm_core_ioremapfree(&dev_priv->hws_map, dev);
I915_WRITE(HWS_PGA, 0x1ffff000);
}
/* Clear the HWS virtual address at teardown */
if (I915_NEED_GFX_HWS(dev))
i915_free_hws(dev);
return 0;
}
@ -165,23 +202,6 @@ static int i915_initialize(struct drm_device * dev, drm_i915_init_t * init)
*/
dev_priv->allow_batchbuffer = 1;
/* Program Hardware Status Page */
if (!I915_NEED_GFX_HWS(dev)) {
dev_priv->status_page_dmah =
drm_pci_alloc(dev, PAGE_SIZE, PAGE_SIZE, 0xffffffff);
if (!dev_priv->status_page_dmah) {
i915_dma_cleanup(dev);
DRM_ERROR("Can not allocate hardware status page\n");
return -ENOMEM;
}
dev_priv->hw_status_page = dev_priv->status_page_dmah->vaddr;
dev_priv->dma_status_page = dev_priv->status_page_dmah->busaddr;
memset(dev_priv->hw_status_page, 0, PAGE_SIZE);
I915_WRITE(HWS_PGA, dev_priv->dma_status_page);
}
DRM_DEBUG("Enabled hardware status page\n");
return 0;
}
@ -773,6 +793,12 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
_DRM_KERNEL | _DRM_DRIVER,
&dev_priv->mmio_map);
/* Init HWS */
if (!I915_NEED_GFX_HWS(dev)) {
ret = i915_init_phys_hws(dev);
if (ret != 0)
return ret;
}
/* On the 945G/GM, the chipset reports the MSI capability on the
* integrated graphics even though the support isn't actually there
@ -796,6 +822,8 @@ int i915_driver_unload(struct drm_device *dev)
if (dev->pdev->msi_enabled)
pci_disable_msi(dev->pdev);
i915_free_hws(dev);
if (dev_priv->mmio_map)
drm_rmmap(dev, dev_priv->mmio_map);