The patch titled
intel-agp.c: fix crash when accessing nonexistent GTT entries in i915
has been added to the -mm tree. Its filename is
intel-agpc-fix-crash-when-accessing-nonexistent-gtt-entries-in-i915.patch
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------------------------------------------------------
Subject: intel-agp.c: fix crash when accessing nonexistent GTT entries in i915
From: Miguel Ojeda <miguel.ojeda.sandonis@xxxxxxxxx>
Commit fc61901373987ad61851ed001fe971f3ee8d96a3 ("agp/intel-agp: Clear
entire GTT on startup") (included since 2.6.32.4) crashes (locks up) the
82915G/GV/910GL Controller when intel-agp.c tries to access nonexistent
GTT entries at:
- for (i = intel_private.gtt_entries; i < current_size->num_entries; i++) {
+ for (i = intel_private.gtt_entries; i < intel_private.gtt_total_size; i++) {
Rationale: I915 (gma900) has 128 MB of video memory (maximum), as per
intel.com (
http://www.intel.com/support/graphics/intel915g/sb/CS-012579.htm ) and
lscpi:
00:02.0 VGA compatible controller: Intel Corporation 82915G/GV/910GL Integrated Graphics Controller (rev 04) (prog-if 00 [VGA controller])
Subsystem: Intel Corporation Device 4147
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0
Interrupt: pin A routed to IRQ 11
Region 0: Memory at ff480000 (32-bit, non-prefetchable) [size=512K]
Region 1: I/O ports at ec00 [size=8]
Region 2: Memory at d8000000 (32-bit, prefetchable) [size=128M]
Region 3: Memory at ff440000 (32-bit, non-prefetchable) [size=256K]
Capabilities: <access denied>
AFAIK, that implies that its gtt_total_size (in pages) should be 32K (as
num_entries showed before the commit) instead of 64K.
Note: The IS_I915 macro includes 945; however, only GMA900 (I915) had 128
MB as the maximum AFAIK. Therefore, I divided the IS_I915 macro. I do
not know about the "E7221" (please check).
How to reproduce: Access kernel.org in iceweasel (Debian Lenny) and the X
server will crash. Sometimes, the kernel freezes.
The fix should be applied to stable series, as well as 2.6.33 and
2.6.34-rc1.
Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@xxxxxxxxx>
Cc: David Woodhouse <David.Woodhouse@xxxxxxxxx>
Cc: Eric Anholt <eric@xxxxxxxxxx>
Cc: Zhenyu Wang <zhenyuw@xxxxxxxxxxxxxxx>
Cc: Dave Airlie <airlied@xxxxxxxx>
Cc: <stable@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/char/agp/intel-agp.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff -puN drivers/char/agp/intel-agp.c~intel-agpc-fix-crash-when-accessing-nonexistent-gtt-entries-in-i915 drivers/char/agp/intel-agp.c
--- a/drivers/char/agp/intel-agp.c~intel-agpc-fix-crash-when-accessing-nonexistent-gtt-entries-in-i915
+++ a/drivers/char/agp/intel-agp.c
@@ -74,11 +74,11 @@ EXPORT_SYMBOL(intel_agp_enabled);
#define PCI_DEVICE_ID_INTEL_SANDYBRIDGE_M_HB 0x0104
#define PCI_DEVICE_ID_INTEL_SANDYBRIDGE_M_IG 0x0106
-/* cover 915 and 945 variants */
#define IS_I915 (agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_E7221_HB || \
agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_82915G_HB || \
- agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_82915GM_HB || \
- agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_82945G_HB || \
+ agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_82915GM_HB)
+
+#define IS_I945 (agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_82945G_HB || \
agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_82945GM_HB || \
agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_82945GME_HB)
@@ -824,14 +824,14 @@ static void intel_i830_init_gtt_entries(
break;
case I915_GMCH_GMS_STOLEN_48M:
/* Check it's really I915G */
- if (IS_I915 || IS_I965 || IS_G33 || IS_G4X)
+ if (IS_I915 || IS_I945 || IS_I965 || IS_G33 || IS_G4X)
gtt_entries = MB(48) - KB(size);
else
gtt_entries = 0;
break;
case I915_GMCH_GMS_STOLEN_64M:
/* Check it's really I915G */
- if (IS_I915 || IS_I965 || IS_G33 || IS_G4X)
+ if (IS_I915 || IS_I945 || IS_I965 || IS_G33 || IS_G4X)
gtt_entries = MB(64) - KB(size);
else
gtt_entries = 0;
@@ -1400,6 +1400,8 @@ static int intel_i915_create_gatt_table(
if (IS_G33)
gtt_map_size = 1024 * 1024; /* 1M on G33 */
+ else if (IS_I915)
+ gtt_map_size = 128 * 1024; /* 128K on I915 */
intel_private.gtt = ioremap(temp2, gtt_map_size);
if (!intel_private.gtt)
return -ENOMEM;
diff -puN /dev/null /dev/null
_
Patches currently in -mm which might be from miguel.ojeda.sandonis@xxxxxxxxx are
intel-agpc-fix-crash-when-accessing-nonexistent-gtt-entries-in-i915.patch
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