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agp/intel-gtt: export the scratch page dma address 

To implement a PPGTT for drm/i915 that fully aliases the GTT, we also
need to properly alias the scratch page.

Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Tested-by: Chris Wilson <chris@chris-wilson.co.uk>
Tested-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Reviewed-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter 2012-02-09 17:15:44 +01:00
parent 7e3b8737e7
commit 50a4c4a94d
2 changed files with 6 additions and 5 deletions
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9
drivers/char/agp/intel-gtt.c
View File

@ -76,7 +76,6 @@ static struct _intel_private {
struct resource ifp_resource;
int resource_valid;
struct page *scratch_page;
dma_addr_t scratch_page_dma;
} intel_private;
#define INTEL_GTT_GEN intel_private.driver->gen
@ -306,9 +305,9 @@ static int intel_gtt_setup_scratch_page(void)
if (pci_dma_mapping_error(intel_private.pcidev, dma_addr))
return -EINVAL;
intel_private.scratch_page_dma = dma_addr;
intel_private.base.scratch_page_dma = dma_addr;
} else
intel_private.scratch_page_dma = page_to_phys(page);
intel_private.base.scratch_page_dma = page_to_phys(page);
intel_private.scratch_page = page;
@ -631,7 +630,7 @@ static unsigned int intel_gtt_mappable_entries(void)
static void intel_gtt_teardown_scratch_page(void)
{
set_pages_wb(intel_private.scratch_page, 1);
pci_unmap_page(intel_private.pcidev, intel_private.scratch_page_dma,
pci_unmap_page(intel_private.pcidev, intel_private.base.scratch_page_dma,
PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
put_page(intel_private.scratch_page);
__free_page(intel_private.scratch_page);
@ -975,7 +974,7 @@ void intel_gtt_clear_range(unsigned int first_entry, unsigned int num_entries)
unsigned int i;
for (i = first_entry; i < (first_entry + num_entries); i++) {
intel_private.driver->write_entry(intel_private.scratch_page_dma,
intel_private.driver->write_entry(intel_private.base.scratch_page_dma,
i, 0);
}
readl(intel_private.gtt+i-1);

2
include/drm/intel-gtt.h
View File

@ -15,6 +15,8 @@ const struct intel_gtt {
unsigned int needs_dmar : 1;
/* Whether we idle the gpu before mapping/unmapping */
unsigned int do_idle_maps : 1;
/* Share the scratch page dma with ppgtts. */
dma_addr_t scratch_page_dma;
} *intel_gtt_get(void);
void intel_gtt_chipset_flush(void);