On 04/13/2011 10:21 AM, Joerg Roedel wrote: > On Wed, Apr 13, 2011 at 08:46:09AM +0200, Ingo Molnar wrote: > First of all, I bisected between v2.6.37-rc2..f005fe12b90c which where > only a couple of patches and merged v2.6.38-rc4 in at every step. There > was no failure found. > Then I tried this again, but this time I merged v2.6.38-rc5 at every > step and was successful. The bad commit in this branch turned out to be > > 1a4a678b12c84db9ae5dce424e0e97f0559bb57c > > which is related to memblock. > > Then I tried to find out which change between 2.6.38-rc4 and 2.6.38-rc5 > is needed to trigger the failure, so I used f005fe12b90c as a base, > bisected between v2.6.38-rc4..v2.6.38-rc5 and merged every bisect step > into the base and tested. Here the bad commit turned out to be > > e6d2e2b2b1e1455df16d68a78f4a3874c7b3ad20 > > which is related to gart. It turned out that the gart aperture on that > box is on another position with these patches. Before it was as > 0xa4000000 and now it is at 0xa0000000. It seems like this has something > to do with the root-cause. > > Reverting commit 1a4a678b12c84db9ae5dce424e0e97f0559bb57c fixes the > problem btw. and booting with iommu=soft also works, but I have no idea > yet why the aperture at that address is a problem (with the patch > reverted the aperture lands at 0x80000000). > > I have put some debug-data online. There is my .config and two > dmesg-files for good (==2.6.39-rc3 + revert) and bad (==2.6.39-rc3) > I also created these dmesg-files again with memblock=debug, maybe that > helps to find the problem. The files are at > > http://www.8bytes.org/~joro/debug/ thanks for the bisecting... so those two patches uncover some problems. [ 0.000000] Checking aperture... [ 0.000000] No AGP bridge found [ 0.000000] Node 0: aperture @ a0000000 size 32 MB [ 0.000000] Aperture pointing to e820 RAM. Ignoring. [ 0.000000] Your BIOS doesn't leave a aperture memory hole [ 0.000000] Please enable the IOMMU option in the BIOS setup [ 0.000000] This costs you 64 MB of RAM [ 0.000000] memblock_x86_reserve_range: [0xa0000000-0xa3ffffff] aperture64 [ 0.000000] Mapping aperture over 65536 KB of RAM @ a0000000 so kernel try to reallocate apperture. because BIOS allocated is pointed to RAM or size is too small. but your radeon does use [0xa0000000, 0xbfffffff) [ 4.281993] radeon 0000:01:05.0: VRAM: 320M 0x00000000C0000000 - 0x00000000D3FFFFFF (320M used) [ 4.290672] radeon 0000:01:05.0: GTT: 512M 0x00000000A0000000 - 0x00000000BFFFFFFF [ 4.298550] [drm] Detected VRAM RAM=320M, BAR=256M [ 4.309857] [drm] RAM width 32bits DDR [ 4.313748] [TTM] Zone kernel: Available graphics memory: 1896524 kiB. [ 4.320379] [TTM] Initializing pool allocator. [ 4.324948] [drm] radeon: 320M of VRAM memory ready [ 4.329832] [drm] radeon: 512M of GTT memory ready. and the one seems working: [ 0.000000] Checking aperture... [ 0.000000] No AGP bridge found [ 0.000000] Node 0: aperture @ a0000000 size 32 MB [ 0.000000] Aperture pointing to e820 RAM. Ignoring. [ 0.000000] Your BIOS doesn't leave a aperture memory hole [ 0.000000] Please enable the IOMMU option in the BIOS setup [ 0.000000] This costs you 64 MB of RAM [ 0.000000] memblock_x86_reserve_range: [0x80000000-0x83ffffff] aperture64 [ 0.000000] Mapping aperture over 65536 KB of RAM @ 80000000 [ 0.000000] memblock_x86_reserve_range: [0xacb6bdc0-0xacb6bddf] BOOTMEM will use different position... [ 4.250159] radeon 0000:01:05.0: VRAM: 320M 0x00000000C0000000 - 0x00000000D3FFFFFF (320M used) [ 4.258830] radeon 0000:01:05.0: GTT: 512M 0x00000000A0000000 - 0x00000000BFFFFFFF [ 4.266742] [drm] Detected VRAM RAM=320M, BAR=256M [ 4.271549] [drm] RAM width 32bits DDR [ 4.275435] [TTM] Zone kernel: Available graphics memory: 1896526 kiB. [ 4.282066] [TTM] Initializing pool allocator. [ 4.282085] usb 7-2: new full speed USB device number 2 using ohci_hcd [ 4.293076] [drm] radeon: 320M of VRAM memory ready [ 4.298277] [drm] radeon: 512M of GTT memory ready. [ 4.303218] [drm] Supports vblank timestamp caching Rev 1 (10.10.2010). [ 4.309854] [drm] Driver supports precise vblank timestamp query. [ 4.315970] [drm] radeon: irq initialized. [ 4.320094] [drm] GART: num cpu pages 131072, num gpu pages 131072 So question is why radeon is using the address [0xa0000000 - 0xc000000], and in E820 it is RAM .... [ 0.000000] BIOS-e820: 0000000000100000 - 00000000acb8d000 (usable) [ 0.000000] BIOS-e820: 00000000acb8d000 - 00000000acb8f000 (reserved) [ 0.000000] BIOS-e820: 00000000acb8f000 - 00000000afce9000 (usable) [ 0.000000] BIOS-e820: 00000000afce9000 - 00000000afd21000 (reserved) [ 0.000000] BIOS-e820: 00000000afd21000 - 00000000afd4f000 (usable) [ 0.000000] BIOS-e820: 00000000afd4f000 - 00000000afdcf000 (reserved) [ 0.000000] BIOS-e820: 00000000afdcf000 - 00000000afecf000 (ACPI NVS) [ 0.000000] BIOS-e820: 00000000afecf000 - 00000000afeff000 (ACPI data) [ 0.000000] BIOS-e820: 00000000afeff000 - 00000000aff00000 (usable) so looks bios program wrong address to the radon card? Thanks Yinghai Lu _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
