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drm/nv50: allocate page for unknown PFB object in nv50_fb.c

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Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2010-11-15 12:50:50 +10:00
parent e41115d0ad
commit 20f63afe98
2 changed files with 56 additions and 1 deletions
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1
drivers/gpu/drm/nouveau/nouveau_drv.h
View File

@ -311,6 +311,7 @@ struct nouveau_timer_engine {
struct nouveau_fb_engine {
int num_tiles;
struct drm_mm tag_heap;
void *priv;
int (*init)(struct drm_device *dev);
void (*takedown)(struct drm_device *dev);

56
drivers/gpu/drm/nouveau/nv50_fb.c
View File

@ -3,16 +3,58 @@
#include "nouveau_drv.h"
#include "nouveau_drm.h"
struct nv50_fb_priv {
struct page *r100c08_page;
dma_addr_t r100c08;
};
static int
nv50_fb_create(struct drm_device *dev)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nv50_fb_priv *priv;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->r100c08_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
if (!priv->r100c08_page) {
kfree(priv);
return -ENOMEM;
}
priv->r100c08 = pci_map_page(dev->pdev, priv->r100c08_page, 0,
PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
if (pci_dma_mapping_error(dev->pdev, priv->r100c08)) {
__free_page(priv->r100c08_page);
kfree(priv);
return -EFAULT;
}
dev_priv->engine.fb.priv = priv;
return 0;
}
int
nv50_fb_init(struct drm_device *dev)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nv50_fb_priv *priv;
int ret;
if (!dev_priv->engine.fb.priv) {
ret = nv50_fb_create(dev);
if (ret)
return ret;
}
priv = dev_priv->engine.fb.priv;
/* Not a clue what this is exactly. Without pointing it at a
* scratch page, VRAM->GART blits with M2MF (as in DDX DFS)
* cause IOMMU "read from address 0" errors (rh#561267)
*/
nv_wr32(dev, 0x100c08, dev_priv->gart_info.sg_dummy_bus >> 8);
nv_wr32(dev, 0x100c08, priv->r100c08 >> 8);
/* This is needed to get meaningful information from 100c90
* on traps. No idea what these values mean exactly. */
@ -36,6 +78,18 @@ nv50_fb_init(struct drm_device *dev)
void
nv50_fb_takedown(struct drm_device *dev)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nv50_fb_priv *priv;
priv = dev_priv->engine.fb.priv;
if (!priv)
return;
dev_priv->engine.fb.priv = NULL;
pci_unmap_page(dev->pdev, priv->r100c08, PAGE_SIZE,
PCI_DMA_BIDIRECTIONAL);
__free_page(priv->r100c08_page);
kfree(priv);
}
void