Bug 12920
| Summary: | savage: mmap2 of /dev/dri/card0 fails with EAGAIN since 2.6.29-rc6 | ||
|---|---|---|---|
| Product: | Platform Specific/Hardware | Reporter: | Alex Villacis Lasso (avillaci) |
| Component: | i386 | Assignee: | platform_i386 |
| Status: | CLOSED CODE_FIX | ||
| Severity: | normal | CC: | rjw, suresh.b.siddha, the.masch, venki |
| Priority: | P1 | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Kernel Version: | 2.6.29-rc6 | Subsystem: | |
| Regression: | Yes | Bisected commit-id: | |
| Bug Depends on: | |||
| Bug Blocks: | 12398 | ||
| Attachments: |
Kernel configuration which succeeds in 2.6.29-rc5 and fails in 2.6.29-rc6 and up.
dmesg output for 2.6.29-rc8 which also shows the bug. Full xorg log when bug happens. strace output that shows EAGAIN as error from mmap2 strace output that shows EAGAIN as error from mmap2 |
||
Created attachment 20642 [details]
Kernel configuration which succeeds in 2.6.29-rc5 and fails in 2.6.29-rc6 and up.
Created attachment 20643 [details]
dmesg output for 2.6.29-rc8 which also shows the bug.
I do not see any message that could point to some particular problem, because similar messages appear in rc5, but I could be wrong.
Created attachment 20644 [details]
Full xorg log when bug happens.
Created attachment 20645 [details]
strace output that shows EAGAIN as error from mmap2
Created attachment 20646 [details]
strace output that shows EAGAIN as error from mmap2
Sorry for double-posting the attachment. I attempted to bisect this bug over the weekend. This is what I got so far: git bisect start # bad: [fec6c6fec3e20637bee5d276fb61dd8b49a3f9cc] Linux 2.6.29-rc7 git bisect bad fec6c6fec3e20637bee5d276fb61dd8b49a3f9cc # good: [d2f8d7ee1a9b4650b4e43325b321801264f7c37a] Linux 2.6.29-rc5 git bisect good d2f8d7ee1a9b4650b4e43325b321801264f7c37a # bad: [ddf9499b3d1e655f212f22b0a703506fcac90b25] x86, Voyager: fix compile by lifting the degeneracy of phys_cpu_present_map git bisect bad ddf9499b3d1e655f212f22b0a703506fcac90b25 # bad: [ba95fd47d177d46743ad94055908d22840370e06] Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block git bisect bad ba95fd47d177d46743ad94055908d22840370e06 # good: [48c0d9ece360ff6001e2ae36aa9b34446d0388a8] Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable git bisect good 48c0d9ece360ff6001e2ae36aa9b34446d0388a8 # bad: [82eb03cfd862a65363fa2826de0dbd5474cfe5e2] cciss: PCI power management reset for kexec git bisect bad 82eb03cfd862a65363fa2826de0dbd5474cfe5e2 # good: [8ce9a75a307e142a8871c649627555e0e4a1eefb] Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip git bisect good 8ce9a75a307e142a8871c649627555e0e4a1eefb I'd take a bet on this being the PAT/mmap breakage again testing latest -tip would be useful: http://people.redhat.com/mingo/tip.git/README in particular the fix below has a chance of resolving it. Ingo ----------------> From 9cdec049389ce2c324fd1ec508a71528a27d4a07 Mon Sep 17 00:00:00 2001 From: Pallipadi, Venkatesh <venkatesh.pallipadi@intel.com> Date: Mon, 23 Mar 2009 12:07:20 -0700 Subject: [PATCH] x86, PAT, PCI: Change vma prot in pci_mmap to reflect inherited prot While looking at the issue in the thread: http://marc.info/?l=dri-devel&m=123606627824556&w=2 noticed a bug in pci PAT code and memory type setting. PCI mmap code did not set the proper protection in vma, when it inherited protection in reserve_memtype. This bug only affects the case where there exists a WC mapping before X does an mmap with /proc or /sys pci interface. This will cause X userlevel mmap from /proc or /sysfs to fail on fork. Reported-by: Kevin Winchester <kjwinchester@gmail.com> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Cc: Jesse Barnes <jbarnes@virtuousgeek.org> Cc: Dave Airlie <airlied@redhat.com> Cc: <stable@kernel.org> LKML-Reference: <20090323190720.GA16831@linux-os.sc.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> --- arch/x86/pci/i386.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c index 5ead808..f234a37 100644 --- a/arch/x86/pci/i386.c +++ b/arch/x86/pci/i386.c @@ -319,6 +319,9 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, return -EINVAL; } flags = new_flags; + vma->vm_page_prot = __pgprot( + (pgprot_val(vma->vm_page_prot) & ~_PAGE_CACHE_MASK) | + flags); } if (((vma->vm_pgoff < max_low_pfn_mapped) || (pwc has a similar problem btw) >
> diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
> index 5ead808..f234a37 100644
> --- a/arch/x86/pci/i386.c
> +++ b/arch/x86/pci/i386.c
> @@ -319,6 +319,9 @@ int pci_mmap_page_range(struct pci_dev *dev, struct
> vm_area_struct *vma,
> return -EINVAL;
> }
> flags = new_flags;
> + vma->vm_page_prot = __pgprot(
> + (pgprot_val(vma->vm_page_prot) & ~_PAGE_CACHE_MASK) |
> + flags);
> }
>
> if (((vma->vm_pgoff < max_low_pfn_mapped) ||
Compiling a full kernel takes too long in my machine (over 6 hours), so I tried manually applying this patch on an already compiled 2.6.29-rc8 checkout. However, it did not fix the problem - the symptoms remain exactly the same.
I have the same problem using archlinux and the latest 2.26.9 kernel of the the distro, I will waiting that the distribution apply the patch. It's work the patch? Bisection points me to the following: be03d9e8022030c16abf534e33e185bfc3d40eef is first bad commit commit be03d9e8022030c16abf534e33e185bfc3d40eef Author: Suresh Siddha <suresh.b.siddha@intel.com> Date: Wed Feb 11 11:20:23 2009 -0800 x86, pat: fix warn_on_once() while mapping 0-1MB range with /dev/mem Jeff Mahoney reported: > With Suse's hwinfo tool, on -tip: > WARNING: at arch/x86/mm/pat.c:637 reserve_pfn_range+0x5b/0x26d() reserve_pfn_range() is not tracking the memory range below 1MB as non-RAM and as such is inconsistent with similar checks in reserve_memtype() and free_memtype() Rename the pagerange_is_ram() to pat_pagerange_is_ram() and add the "track legacy 1MB region as non RAM" condition. And also, fix reserve_pfn_range() to return -EINVAL, when the pfn range is RAM. This is to be consistent with this API design. Reported-and-tested-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> :040000 040000 feb3bf21d762e885284cb1bedb5d2c6c0d16811b b4c2143775386ce15dd49b6749c1f7913d8beb00 M arch I have confirmed that reverting this one patch fixes the issue in both 2.6.29-rc8 and 2.6.29 final. Is there anything else I could do to help fix this problem? Going to try re-applying failing commit, then applying http://marc.info/?l=linux-kernel&m=123691716419111&w=2 to see whether this fixes the issue too. Fix for this issue (http://marc.info/?l=linux-kernel&m=123854290308079&w=2) went into linux-2.6.29.1. Can we please check 2.6.29.1 and close this bug if the issue is resolved? The 2.6.29.1 patch indeed fixes this bug for me. Marking as FIXED. The 2.6.29.1 patch indeed fixes this bug for me. Marking as FIXED. |
Latest working kernel version: 2.6.29-rc5 Earliest failing kernel version: 2.6.29-rc6 Distribution: Fedora 10 i386 Hardware Environment: /proc/cpuinfo: processor : 0 vendor_id : GenuineIntel cpu family : 15 model : 1 model name : Intel(R) Pentium(R) 4 CPU 1.70GHz stepping : 2 cpu MHz : 1700.047 cache size : 256 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pebs bts bogomips : 3400.09 clflush size : 64 power management: /proc/iomem: 00000000-0000ffff : reserved 00010000-0009fbff : System RAM 0009fc00-0009ffff : reserved 000a0000-000bffff : Video RAM area 000c0000-000cbfff : Video ROM 000f0000-000fffff : reserved 000f0000-000fffff : System ROM 00100000-1f7effff : System RAM 00400000-0068676c : Kernel code 0068676d-007eca67 : Kernel data 00838000-00c3fd83 : Kernel bss 1f7f0000-1f7f7fff : ACPI Tables 1f7f8000-1f7fffff : ACPI Non-volatile Storage ceb00000-debfffff : PCI Bus 0000:01 d0000000-d7ffffff : 0000:01:00.0 d0000000-d06effff : vesafb ded00000-deefffff : PCI Bus 0000:01 dee70000-dee7ffff : 0000:01:00.0 dee80000-deefffff : 0000:01:00.0 df000000-df7fffff : 0000:00:09.0 dffe0000-dffe7fff : 0000:00:09.0 dfffee00-dfffeeff : 0000:00:12.0 dfffee00-dfffeeff : via-rhine dfffef00-dfffefff : 0000:00:10.3 dfffef00-dfffefff : ehci_hcd dffff000-dfffffff : 0000:00:09.0 e0000000-efffffff : 0000:00:00.0 fec00000-fec00fff : reserved fee00000-fee00fff : Local APIC fee00000-fee00fff : reserved fff80000-ffffffff : reserved /proc/ioports: 0000-001f : dma1 0020-0021 : pic1 0040-0043 : timer0 0050-0053 : timer1 0060-0060 : keyboard 0064-0064 : keyboard 0070-0071 : rtc0 0080-008f : dma page reg 00a0-00a1 : pic2 00c0-00df : dma2 00f0-00ff : fpu 0170-0177 : 0000:00:11.1 0170-0177 : pata_via 01f0-01f7 : 0000:00:11.1 01f0-01f7 : pata_via 0201-0208 : ns558-pnp 0295-0296 : it87 0295-0296 : it87 0330-0331 : MPU401 UART 0376-0376 : 0000:00:11.1 0376-0376 : pata_via 0378-037a : parport0 03c0-03df : vesafb 03f2-03f2 : floppy 03f4-03f5 : floppy 03f6-03f6 : 0000:00:11.1 03f6-03f6 : pata_via 03f7-03f7 : floppy 03f8-03ff : serial 0400-040f : 0000:00:11.0 0400-0407 : vt596_smbus 0800-087f : 0000:00:11.0 0800-0803 : ACPI PM1a_EVT_BLK 0804-0805 : ACPI PM1a_CNT_BLK 0808-080b : ACPI PM_TMR 0810-0815 : ACPI CPU throttle 0820-0823 : ACPI GPE0_BLK 0cf8-0cff : PCI conf1 cc00-ccff : 0000:00:12.0 cc00-ccff : via-rhine d000-d0ff : 0000:00:11.5 d000-d0ff : VIA8233 d400-d41f : 0000:00:10.0 d400-d41f : uhci_hcd d800-d81f : 0000:00:10.1 d800-d81f : uhci_hcd dc00-dc1f : 0000:00:10.2 dc00-dc1f : uhci_hcd e000-e007 : 0000:00:0b.0 e400-e407 : 0000:00:0b.0 e400-e402 : parport1 e403-e407 : parport1 e800-e81f : 0000:00:0b.0 e800-e807 : serial e808-e80f : serial ec00-ecff : 0000:00:09.0 fc00-fc0f : 0000:00:11.1 fc00-fc0f : pata_via lspci -vvv 00:00.0 Host bridge: VIA Technologies, Inc. P4M266 Host Bridge Subsystem: VIA Technologies, Inc. Device 0000 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort+ >SERR- <PERR- INTx- Latency: 8 Region 0: Memory at e0000000 (32-bit, prefetchable) [size=256M] Capabilities: [a0] AGP version 2.0 Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2,x4 Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP+ GART64- 64bit- FW- Rate=x4 Capabilities: [c0] Power Management version 2 Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) Status: D0 PME-Enable- DSel=0 DScale=0 PME- Kernel driver in use: agpgart-via Kernel modules: via-agp 00:01.0 PCI bridge: VIA Technologies, Inc. VT8633 [Apollo Pro266 AGP] (prog-if 00 [Normal decode]) Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx- Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort+ >SERR- <PERR+ INTx- Latency: 0 Bus: primary=00, secondary=01, subordinate=01, sec-latency=0 I/O behind bridge: 0000f000-00000fff Memory behind bridge: ded00000-deefffff Prefetchable memory behind bridge: ceb00000-debfffff Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR- BridgeCtl: Parity- SERR- NoISA+ VGA+ MAbort- >Reset- FastB2B- PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn- Capabilities: [80] Power Management version 2 Flags: PMEClk- DSI- D1+ D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) Status: D0 PME-Enable- DSel=0 DScale=0 PME- 00:09.0 VGA compatible controller: Oak Technology, Inc OTI-64111 [Spitfire] (rev 10) (prog-if 00 [VGA controller]) Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Interrupt: pin A routed to IRQ 11 Region 0: Memory at dffff000 (32-bit, non-prefetchable) [disabled] [size=4K] Region 1: Memory at df000000 (32-bit, non-prefetchable) [disabled] [size=8M] Region 2: I/O ports at ec00 [disabled] [size=256] Expansion ROM at dffe0000 [disabled] [size=32K] 00:0b.0 Serial controller: Timedia Technology Co Ltd PCI2S550 (Dual 16550 UART) (rev 01) (prog-if 02 [16550]) Subsystem: Timedia Technology Co Ltd Device 5079 Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping+ SERR+ FastB2B- DisINTx- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Interrupt: pin A routed to IRQ 11 Region 0: I/O ports at e800 [size=32] Region 2: I/O ports at e400 [size=8] Region 3: I/O ports at e000 [size=8] Kernel driver in use: serial Kernel modules: parport_pc 00:10.0 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 80) (prog-if 00 [UHCI]) Subsystem: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 32, Cache Line Size: 32 bytes Interrupt: pin A routed to IRQ 5 Region 4: I/O ports at d400 [size=32] Capabilities: [80] Power Management version 2 Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0+,D1+,D2+,D3hot+,D3cold+) Status: D0 PME-Enable- DSel=0 DScale=0 PME- Kernel driver in use: uhci_hcd Kernel modules: uhci-hcd 00:10.1 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 80) (prog-if 00 [UHCI]) Subsystem: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 32, Cache Line Size: 32 bytes Interrupt: pin B routed to IRQ 11 Region 4: I/O ports at d800 [size=32] Capabilities: [80] Power Management version 2 Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0+,D1+,D2+,D3hot+,D3cold+) Status: D0 PME-Enable- DSel=0 DScale=0 PME- Kernel driver in use: uhci_hcd Kernel modules: uhci-hcd 00:10.2 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 80) (prog-if 00 [UHCI]) Subsystem: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 32, Cache Line Size: 32 bytes Interrupt: pin C routed to IRQ 5 Region 4: I/O ports at dc00 [size=32] Capabilities: [80] Power Management version 2 Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0+,D1+,D2+,D3hot+,D3cold+) Status: D0 PME-Enable- DSel=0 DScale=0 PME- Kernel driver in use: uhci_hcd Kernel modules: uhci-hcd 00:10.3 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 82) (prog-if 20 [EHCI]) Subsystem: VIA Technologies, Inc. USB 2.0 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 32, Cache Line Size: 128 bytes Interrupt: pin D routed to IRQ 11 Region 0: Memory at dfffef00 (32-bit, non-prefetchable) [size=256] Capabilities: [80] Power Management version 2 Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0+,D1+,D2+,D3hot+,D3cold+) Status: D0 PME-Enable- DSel=0 DScale=0 PME+ Kernel driver in use: ehci_hcd Kernel modules: ehci-hcd 00:11.0 ISA bridge: VIA Technologies, Inc. VT8235 ISA Bridge Subsystem: VIA Technologies, Inc. KT4AV motherboard Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping+ SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Capabilities: [c0] Power Management version 2 Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) Status: D0 PME-Enable- DSel=0 DScale=0 PME- Kernel modules: via-ircc, i2c-viapro 00:11.1 IDE interface: VIA Technologies, Inc. VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06) (prog-if 8a [Master SecP PriP]) Subsystem: VIA Technologies, Inc. VT82C586/B/VT82C686/A/B/VT8233/A/C/VT8235 PIPC Bus Master IDE Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 32 Interrupt: pin A routed to IRQ 255 Region 0: [virtual] Memory at 000001f0 (32-bit, non-prefetchable) [size=8] Region 1: [virtual] Memory at 000003f0 (type 3, non-prefetchable) [size=1] Region 2: [virtual] Memory at 00000170 (32-bit, non-prefetchable) [size=8] Region 3: [virtual] Memory at 00000370 (type 3, non-prefetchable) [size=1] Region 4: I/O ports at fc00 [size=16] Capabilities: [c0] Power Management version 2 Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) Status: D0 PME-Enable- DSel=0 DScale=0 PME- Kernel driver in use: pata_via 00:11.5 Multimedia audio controller: VIA Technologies, Inc. VT8233/A/8235/8237 AC97 Audio Controller (rev 50) Subsystem: VIA Technologies, Inc. K7VT2 motherboard Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Interrupt: pin C routed to IRQ 5 Region 0: I/O ports at d000 [size=256] Capabilities: [c0] Power Management version 2 Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) Status: D0 PME-Enable- DSel=0 DScale=0 PME- Kernel driver in use: VIA 82xx Audio Kernel modules: snd-via82xx 00:12.0 Ethernet controller: VIA Technologies, Inc. VT6102 [Rhine-II] (rev 74) Subsystem: VIA Technologies, Inc. VT6102 [Rhine II] Embeded Ethernet Controller on VT8235 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 32 (750ns min, 2000ns max), Cache Line Size: 32 bytes Interrupt: pin A routed to IRQ 5 Region 0: I/O ports at cc00 [size=256] Region 1: Memory at dfffee00 (32-bit, non-prefetchable) [size=256] Capabilities: [40] Power Management version 2 Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+) Status: D0 PME-Enable- DSel=0 DScale=0 PME- Kernel driver in use: via-rhine Kernel modules: via-rhine 01:00.0 VGA compatible controller: S3 Inc. VT8375 [ProSavage8 KM266/KL266] (prog-if 00 [VGA controller]) Subsystem: S3 Inc. VT8375 [ProSavage8 KM266/KL266] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 32 (1000ns min, 63750ns max), Cache Line Size: 32 bytes Interrupt: pin A routed to IRQ 5 Region 0: Memory at dee80000 (32-bit, non-prefetchable) [size=512K] Region 1: Memory at d0000000 (32-bit, prefetchable) [size=128M] Expansion ROM at dee70000 [disabled] [size=64K] Capabilities: [dc] Power Management version 2 Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) Status: D0 PME-Enable- DSel=0 DScale=0 PME- Capabilities: [80] AGP version 2.0 Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA- ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x4 Command: RQ=32 ArqSz=0 Cal=0 SBA- AGP+ GART64- 64bit- FW- Rate=x4 Kernel modules: savagefb Software Environment: Linux version 2.6.29-rc8 (alex@karlalex.palosanto.com) (gcc version 4.3.2 20081105 (Red Hat 4.3.2-7) (GCC) ) #1 PREEMPT Sat Mar 21 13:57:36 ECT 2009 If some fields are empty or look unusual you may have an old version. Compare to the current minimal requirements in Documentation/Changes. Linux karlalex.palosanto.com 2.6.29-rc8 #1 PREEMPT Sat Mar 21 13:57:36 ECT 2009 i686 i686 i386 GNU/Linux Gnu C 4.3.2 Gnu make 3.81 binutils 2.18.50.0.9 util-linux 2.14.1 mount support module-init-tools 3.5 e2fsprogs 1.41.4 pcmciautils 014 quota-tools 3.16. PPP 2.4.4 Linux C Library 2.9 Dynamic linker (ldd) 2.9 Procps 3.2.7 Net-tools 1.60 Kbd 1.12 oprofile 0.9.4 Sh-utils 6.12 udev 127 wireless-tools 29 Modules Loaded usb_storage ipv6 fuse savage drm eeprom sco bridge stp llc bnep l2cap bluetooth it87 hwmon_vid hwmon vfat fat dm_multipath uinput ppdev snd_via82xx snd_ac97_codec ac97_bus snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_pcm_oss snd_mixer_oss floppy snd_pcm i2c_viapro pcspkr sr_mod via_rhine i2c_core snd_timer mii snd_page_alloc cdrom via_ircc irda crc_ccitt snd_mpu401 snd_mpu401_uart snd_rawmidi snd_seq_device ns558 snd gameport soundcore parport_pc parport via_agp uhci_hcd ohci_hcd ehci_hcd usbcore Problem Description: A regression was introduced between 2.6.29-rc5 and -rc6 that results in an attempt to mmap2 on /dev/dri/card0 (ProSavageDDRK) to fail with EAGAIN. This hits the X server and results in broken DRI/Mesa support. Steps to reproduce: Get 2.6.29-rc6 or higher and a Savage chipset (don't know about other chipsets) Attempt to start X Report DRI support (from Xorg.0.log) When the bug hits, the following appears on the X log: ---------------- (II) [drm] loaded kernel module for "savage" driver. (II) [drm] DRM interface version 1.3 (II) [drm] DRM open master succeeded. (II) SAVAGE(0): [drm] Using the DRM lock SAREA also for drawables. (II) SAVAGE(0): [drm] framebuffer handle = 0xd0000000 (II) SAVAGE(0): [drm] added 1 reserved context for kernel (II) SAVAGE(0): X context handle = 0x1 (II) SAVAGE(0): [drm] installed DRM signal handler (II) SAVAGE(0): [agp] Mode 0x1f000207 [AGP 0x1106/0x3148; Card 0x5333/0x8d04] (II) SAVAGE(0): [agp] 16384 kB allocated with handle 0x00000001 (II) SAVAGE(0): [agp] command DMA handle = 0xe0000000 (II) SAVAGE(0): [agp] agpTextures handle = 0xe0100000 (II) SAVAGE(0): [drm] aperture handle = 0xd2000000 (II) SAVAGE(0): [drm] Enabling ShadowStatus for DRI. (II) SAVAGE(0): [drm] Status handle = 0x18a12000 (EE) SAVAGE(0): [drm] Could not map status page (II) SAVAGE(0): [drm] removed 1 reserved context for kernel (II) SAVAGE(0): [drm] unmapping 8192 bytes of SAREA 0xe0010000 at 0xb803a000 (II) SAVAGE(0): [drm] Closed DRM master. (II) SAVAGE(0): Resetting ShadowStatus. (EE) SAVAGE(0): DRI isn't enabled ---------------- A strace of the Xorg process shows: open("/dev/dri/card0", O_RDWR|O_LARGEFILE) = 12 write(0, "drmOpenDevice: open result is 12,"..., 39) = 39 ioctl(12, DEVFSDIOC_GET_PROTO_REV, 0x9f89180) = 0 ioctl(12, DEVFSDIOC_GET_PROTO_REV, 0x9f89180) = 0 ... ioctl(12, 0xc0186415, 0xbfe7c678) = 0 write(0, "(II) SAVAGE(0): [drm] Status hand"..., 49) = 49 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_SHARED, 12, 0x14335) = -1 EAGAIN (Resource temporarily unavailable) write(2, "(EE) SAVAGE(0): [drm] Could not m"..., 48) = 48 write(0, "(EE) SAVAGE(0): [drm] Could not m"..., 48) = 48 munmap(0xffffffff, 4096) = -1 EINVAL (Invalid argument)