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    SubjectRe: Linux 3.8-rc4
    From
    On Tue, Jan 22, 2013 at 9:36 AM, Deucher, Alexander
    <Alexander.Deucher@amd.com> wrote:
    >> -----Original Message-----
    >> From: Shuah Khan [mailto:shuahkhan@gmail.com]
    >> Sent: Tuesday, January 22, 2013 11:15 AM
    >> To: Deucher, Alexander
    >> Cc: Linus Torvalds; Linux Kernel Mailing List
    >> Subject: Re: Linux 3.8-rc4
    >>
    >> On Sat, Jan 19, 2013 at 9:44 AM, Deucher, Alexander
    >> <Alexander.Deucher@amd.com> wrote:
    >> >> -----Original Message-----
    >> >> From: Shuah Khan [mailto:shuahkhan@gmail.com]
    >> >> Sent: Friday, January 18, 2013 7:40 PM
    >> >> To: Linus Torvalds; Deucher, Alexander
    >> >> Cc: Linux Kernel Mailing List
    >> >> Subject: Re: Linux 3.8-rc4
    >> >>
    >> >> On Fri, Jan 18, 2013 at 3:37 PM, Shuah Khan <shuahkhan@gmail.com>
    >> wrote:
    >> >> > On Fri, Jan 18, 2013 at 10:51 AM, Shuah Khan <shuahkhan@gmail.com>
    >> >> wrote:
    >> >>
    >> >> >
    >> >> > ok. I bisected the DMAR faults and it points to the following commit:
    >> >> >
    >> >> > 909d9eb67f1e4e39f2ea88e96bde03d560cde3eb
    >> >> >
    >> >> > This commit as I recall, fixed the crash problem I was seeing back in
    >> >> > 3.8-rc1. Reverting to see if crash problem reappears.
    >> >>
    >> >> Confirming that with this commit reverted crash problem re-appeared.
    >> >> With this commit, DMAR faults show up.
    >> >
    >> > I'm not quite sure what's going on with your system. At this point it's
    >> probably best to just disable the DMA ring on these cards until we sort out
    >> what's going on. The attached patch disables the use of the DMA ring. Let
    >> me know if it fixes the issues you are seeing.
    >> >
    >>
    >> I applied this patch to 3.8-rc4 and didn't fix the DMAR faults.
    >
    > Are you getting continuous DMAR faults or just when while the module is being loaded?
    >
    > Alex

    During module initialization, I think might be actually right after
    RV620 Microcode loading attempt: dmesg excerpts starting from radeoan
    init:

    [ 22.150520] [drm] radeon defaulting to kernel modesetting.
    [ 22.150524] [drm] radeon kernel modesetting enabled.
    [ 22.150793] [drm] initializing kernel modesetting (RV620 0x1002:0x95C4 0x103C
    :0x30DC).
    [ 22.150815] [drm] register mmio base: 0x90300000
    [ 22.150817] [drm] register mmio size: 65536
    [ 22.150918] ATOM BIOS: HP
    [ 22.150941] radeon 0000:01:00.0: VRAM: 128M 0x0000000000000000 - 0x0000000007
    FFFFFF (128M used)
    [ 22.150943] radeon 0000:01:00.0: GTT: 512M 0x0000000008000000 - 0x0000000027F
    FFFFF
    [ 22.153790] [drm] Detected VRAM RAM=128M, BAR=128M
    [ 22.153793] [drm] RAM width 64bits DDR
    [ 22.153850] [TTM] Zone kernel: Available graphics memory: 989986 kiB
    [ 22.153852] [TTM] Initializing pool allocator
    [ 22.153857] [TTM] Initializing DMA pool allocator
    [ 22.153884] [drm] radeon: 128M of VRAM memory ready
    [ 22.153885] [drm] radeon: 512M of GTT memory ready.
    [ 22.153902] [drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
    [ 22.153903] [drm] Driver supports precise vblank timestamp query.
    [ 22.153947] radeon 0000:01:00.0: irq 51 for MSI/MSI-X
    [ 22.153958] radeon 0000:01:00.0: radeon: using MSI.
    [ 22.153988] [drm] radeon: irq initialized.
    [ 22.154034] [drm] GART: num cpu pages 131072, num gpu pages 131072
    [ 22.154796] [drm] probing gen 2 caps for device 8086:2a41 = 1/0

    [ 22.154969] [drm] Loading RV620 Microcode

    [ 22.218044] dmar: DRHD: handling fault status reg 3
    [ 22.218054] dmar: DMAR:[DMA Read] Request device [01:00.0] fault
    addr 80000000
    [ 22.218054] DMAR:[fault reason 06] PTE Read access is not set
    [ 22.218083] dmar: DRHD: handling fault status reg 3
    [ 22.218089] dmar: DMAR:[DMA Read] Request device [01:00.0] fault
    addr 80002000
    [ 22.218089] DMAR:[fault reason 06] PTE Read access is not set
    [ 22.218123] dmar: DRHD: handling fault status reg 3
    [ 22.218128] dmar: DMAR:[DMA Read] Request device [01:00.0] fault
    addr 80004000
    [ 22.218128] DMAR:[fault reason 06] PTE Read access is not set
    [ 22.218155] dmar: DRHD: handling fault status reg 3
    [ 22.218159] dmar: DMAR:[DMA Read] Request device [01:00.0] fault
    addr 80006000
    [ 22.218159] DMAR:[fault reason 06] PTE Read access is not set
    [ 22.218169] dmar: DRHD: handling fault status reg 3
    [ 22.218173] dmar: DMAR:[DMA Read] Request device [01:00.0] fault
    addr 80007000
    [ 22.218173] DMAR:[fault reason 06] PTE Read access is not set
    [ 22.218191] dmar: DRHD: handling fault status reg 3

    tons of these and then:


    [ 22.236419] [drm] PCIE GART of 512M enabled (table at 0x0000000000040000).
    [ 22.236479] radeon 0000:01:00.0: WB enabled
    [ 22.236483] radeon 0000:01:00.0: fence driver on ring 0 use gpu
    addr 0x0000000008
    000c00 and cpu addr 0xffff88002f436c00
    [ 22.236485] radeon 0000:01:00.0: fence driver on ring 3 use gpu
    addr 0x0000000008
    000c0c and cpu addr 0xffff88002f436c0c
    [ 22.270041] [drm] ring test on 0 succeeded in 1 usecs
    [ 22.270099] [drm] ring test on 3 succeeded in 1 usecs
    [ 22.272156] [drm] ib test on ring 0 succeeded in 0 usecs
    [ 22.272170] [drm] ib test on ring 3 succeeded in 0 usecs
    [ 22.272705] [drm] radeon atom DIG backlight initialized
    [ 22.272707] [drm] Radeon Display Connectors
    [ 22.272708] [drm] Connector 0:
    [ 22.272710] [drm] LVDS-1
    [ 22.272711] [drm] Encoders:
    [ 22.272712] [drm] LCD1: INTERNAL_KLDSCP_LVTMA
    [ 22.272713] [drm] Connector 1:
    [ 22.272714] [drm] VGA-1
    [ 22.272716] [drm] DDC: 0x7e40 0x7e40 0x7e44 0x7e44 0x7e48 0x7e48
    0x7e4c 0x7e4c
    [ 22.272717] [drm] Encoders:
    [ 22.272718] [drm] CRT1: INTERNAL_KLDSCP_DAC1
    [ 22.272719] [drm] Connector 2:
    [ 22.272720] [drm] DVI-D-1
    [ 22.272721] [drm] HPD1
    [ 22.272723] [drm] DDC: 0x7e60 0x7e60 0x7e64 0x7e64 0x7e68 0x7e68
    0x7e6c 0x7e6c
    [ 22.272724] [drm] Encoders:
    [ 22.272725] [drm] DFP1: INTERNAL_UNIPHY
    [ 22.272758] [drm] radeon: power management initialized
    [ 23.232093] fbcon: radeondrmfb (fb0) is primary device
    [ 23.496217] Console: switching to colour frame buffer device 180x56
    [ 23.499083] radeon 0000:01:00.0: fb0: radeondrmfb frame buffer device
    [ 23.499085] radeon 0000:01:00.0: registered panic notifier
    [ 23.499100] [drm] Initialized radeon 2.28.0 20080528 for
    0000:01:00.0 on minor 0


    Attaching entire dmesg as well:

    -- Shuah
    [unhandled content-type:application/octet-stream]
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