Hi,
Up to kernel 3.10.40, zx1 AGP GART was successfully detected:
[ 15.896075] Linux agpgart interface v0.103
[ 17.272674] agpgart: HP ZX1 IOC: IOPDIR shared with sba_iommu
[ 17.272980] (null): AGP aperture is 512M @ 0x60000000
[ 17.273015] agpgart: Detected HP ZX1 HWP0003 AGP chipset (ioc=fed01000, lba=f
ed28000)
<snip>
[ 29.602989] radeon 0000:80:00.0: putting AGP V2 device into 2x mode
[ 29.603306] radeon 0000:80:00.0: GTT: 512M 0x60000000 - 0x7FFFFFFF
[ 29.603399] [drm] Generation 1 PCI interface in multifunction mode
Starting with kernel 3.11-rc1, zx1 AGP GART is no more detected and my
ATI FireGL X1 AGP graphics adapter is set to PCI mode:
[ 5.442563] Linux agpgart interface v0.103
[ 5.937458] agpgart: HP ZX1 IOC: IOPDIR shared with sba_iommu
[ 5.937491] agpgart: No reserved IO PDIR entry found; GART disabled
<snip>
[ 6.028511] [drm:radeon_agp_init] *ERROR* Unable to acquire AGP: -19
[ 6.028543] [drm] Forcing AGP to PCI mode
[ 6.028631] [drm] Generation 1 PCI interface in multifunction mode
Note: Nevermind the timing, timer frequency isn't the same between the
two runs (250 Hz vs 1000 Hz).
I've managed to nearly bisect the regression. I say nearly, because
some commits made the kernel unbuildable and must be skipped.
So, the offending candidates are:
- 66345d5f79fcfa0214f5d98763643d4ee8e6965d (ACPI / ia64 / sba_iommu:
Use ACPI scan handler for device discovery);
- 24071f472d813fccacc1ef7356b1f41422a1b968 (ACPI / scan: Do not bind
ACPI drivers to objects with scan handlers);
- d9e455f53f6fb93c764de2399c3894bbdfd2caa7 (ACPI / scan: Simplify ACPI
driver probing).
These were merged with 8e9914d5efe460600f5948da7ae4c1b6c038a4c0 (Merge
branch 'acpi-scan').
I bet that the culprit is 66345d5f79fcfa0214f5d98763643d4ee8e6965d as
it is zx1 specific, but I can't verify for sure as reverting it makes
the kernel panics:
IOC IOMMU Driver: probe of HWP0001:00 failed with error -22
Kernel panic - not syncinc: Unable to find SBA IOMMU: Try a generic or
DIG kernel
(Yep, I'm running HP-zx1/sx1000, i.e. CONFIG_IA64_HP_ZX1=y kernel).
What's your opinion ia64 gurus? How to fix the breakage with the zx1
AGP GART detection?
Thanks,
Émeric
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