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mmio: Limit the uc- mapping to only map the registers

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In the future, we may like to enable wc mapping of at least the GATT,
and so causing a conflict if we attempt to map the entire bar as uc-
here. Obviously we need a better fallback plan, but for the moment only
attempt to map the portion of the pci space that we use for register
access.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2012-08-26 21:22:15 +01:00 committed by Daniel Vetter
parent a4783f9485
commit 7a02aa4cbf
1 changed files with 14 additions and 6 deletions
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20
lib/intel_mmio.c
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@ -80,8 +80,8 @@ intel_map_file(char *file)
void
intel_get_mmio(struct pci_device *pci_dev)
{
uint32_t devid;
int mmio_bar;
uint32_t devid, gen;
int mmio_bar, mmio_size;
int error;
devid = pci_dev->device_id;
@ -90,11 +90,19 @@ intel_get_mmio(struct pci_device *pci_dev)
else
mmio_bar = 0;
gen = intel_gen(devid);
if (gen < 3)
mmio_size = 64*1024;
else if (gen < 5)
mmio_size = 512*1024;
else
mmio_size = 2*1024*1024;
error = pci_device_map_range (pci_dev,
pci_dev->regions[mmio_bar].base_addr,
pci_dev->regions[mmio_bar].size,
PCI_DEV_MAP_FLAG_WRITABLE,
&mmio);
pci_dev->regions[mmio_bar].base_addr,
mmio_size,
PCI_DEV_MAP_FLAG_WRITABLE,
&mmio);
if (error != 0) {
fprintf(stderr, "Couldn't map MMIO region: %s\n",