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intel/agp: rewrite GTT on resume

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On my Intel chipset (965GM), the GTT is entirely erased across
suspend/resume.  This patch simply re-plays the current mapping at resume
time to restore the table.=20

I noticed this once I started relying on persistent GTT mappings across VT
switch in our GEM work -- the old X server and DRM code carefully unbind
all memory from the GTT on VT switch, but GEM does not bother.

I placed the list management and rewrite code in the generic layer on the
assumption that it will be needed on other hardware, but I did not add the
rewrite call to anything other than the Intel resume function.

Keep a list of current GATT mappings.  At resume time, rewrite them into
the GATT.  This is needed on Intel (at least) as the entire GATT is
cleared across suspend/resume.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Keith Packard <keithp@keithp.com>
Cc: Dave Jones <davej@codemonkey.org.uk>
Cc: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Keith Packard
2008-07-31 15:48:07 +10:00
committed by Dave Airlie
parent e3cf69511a
commit a8c84df9f7
5 changed files with 43 additions and 0 deletions
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5
drivers/char/agp/intel-agp.c
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@@ -2244,6 +2244,7 @@ static void __devexit agp_intel_remove(struct pci_dev *pdev)
static int agp_intel_resume(struct pci_dev *pdev)
{
struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
int ret_val;
pci_restore_state(pdev);
@@ -2271,6 +2272,10 @@ static int agp_intel_resume(struct pci_dev *pdev)
else if (bridge->driver == &intel_i965_driver)
intel_i915_configure();
ret_val = agp_rebind_memory();
if (ret_val != 0)
return ret_val;
return 0;
}
#endif