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agp/intel: allow cacheable and GDFT PTEs on ValleyView

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The PTE format is similar to SNB, but we don't support an MLC and don't
need chipset flushing.

Note: I have my questions whether this is right, given that MLC died
for snb & ivb, that ivb has grown a L3$ cache instead (which vlv seems
to have, too) and that the LLC bit here isn't actually LLC, but just
means 'snoop cpu caches'.

But I plan to burn this all with the heat of a thousands suns in my
gtt rework, so who cares ;-)

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
[danvet: Added note.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Jesse Barnes 2012-06-15 11:55:19 -07:00 committed by Daniel Vetter
parent bd9e8413c9
commit e87c46993e
1 changed files with 9 additions and 2 deletions
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11
drivers/char/agp/intel-gtt.c
View file

@ -1183,9 +1183,17 @@ static void gen6_write_entry(dma_addr_t addr, unsigned int entry,
static void valleyview_write_entry(dma_addr_t addr, unsigned int entry,
unsigned int flags)
{
unsigned int type_mask = flags & ~AGP_USER_CACHED_MEMORY_GFDT;
unsigned int gfdt = flags & AGP_USER_CACHED_MEMORY_GFDT;
u32 pte_flags;
pte_flags = GEN6_PTE_UNCACHED | I810_PTE_VALID;
if (type_mask == AGP_USER_MEMORY)
pte_flags = GEN6_PTE_UNCACHED | I810_PTE_VALID;
else {
pte_flags = GEN6_PTE_LLC | I810_PTE_VALID;
if (gfdt)
pte_flags |= GEN6_PTE_GFDT;
}
/* gen6 has bit11-4 for physical addr bit39-32 */
addr |= (addr >> 28) & 0xff0;
@ -1380,7 +1388,6 @@ static const struct intel_gtt_driver valleyview_gtt_driver = {
.write_entry = valleyview_write_entry,
.dma_mask_size = 40,
.check_flags = gen6_check_flags,
.chipset_flush = i9xx_chipset_flush,
};
/* Table to describe Intel GMCH and AGP/PCIE GART drivers. At least one of