Hello, I am trying to setup kernel 2.6.16.16 with ALSA to work on an embedded platform (ARM XScale IXP425, originally network appliance). While I am now able to setup a basic board support package with a recent kernel (2.6.16.16) and basic hardware support, I encountered fundamental problems with ALSA on the target platform. Basically, I am getting lots of page faults and other symptoms when accessing the ALSA API. According to my research this may be a well known problem with non-coherent architectures and ALSA DMA access and I/O mapping. This is just a blind guess (since it is the only hint that I have found on the web). Although everyone and everything suggest that ARM / ALSA / DMA coherency has been fixed years ago - at the end ALSA still does not work here and I have no clue where to search. I also stumbled across this issue on MIPS mailing list yesterday, there is an ALSA patch for this architecture and this one is very recent: http://www.spinics.net/lists/mips/msg22773.html History for reference: http://thread.gmane.org/gmane.linux.alsa.devel/12676/focus=12711 http://lkml.org/lkml/2004/2/29/74 I would like to donate all required hardware if I can find someone who wants to help and is capable of debugging this, e.g.: - samples of the embedded board ( http://www.gateworks.com/avila_gw2348_4.htm ) - passive MiniPCI-to-PCI adapters for testing - active (PCI-bridge) MiniPCI-to-PCI adapters (in order to get various standard PCI boards working) - some PCI soundcards (VT1712, VT1724, pro-audio RME Digi96/8) - USB sound card Any help is appreciated! Regards Lars ##################################################################### # error descriptions ##################################################################### I see two types of failure: 1) PCI audio device drivers exit with snd_pcm_mmap_data_nopage (see below) 2) USB audio driver plays for some seconds (reporting underruns) and will then fail: # /usr/local/bin/aplay /home/lars/tori-test-48k.wav Playing WAVE '/home/lars/tori-test-48k.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo underrun!!! (at least 4.662 ms long) underrun!!! (at least 0.134 ms long) underrun!!! (at least 25.856 ms long) underrun!!! (at least 0.138 ms long) underrun!!! (at least 5.296 ms long) ... aplay: pcm_write:1222: write error: Input/output error timeout: still 12 active urbs.. # usb 1-2: USB disconnect, address 2 Playback via USB audio will also produce stack traces from either khubd or pdflush (see below). PCI and USB problems might be completely unrelated: Looking at the USB audio driver, I think they did not use ALSA API for memory allocation and I/O mapping - instead they create URBs allocated by the USB core. ##################################################################### # PCI audio device (snd_ice1724) ##################################################################### Unable to handle kernel paging request at virtual address cc33cc37 pgd = c3bd4000 [cc33cc37] *pgd=00000000 Internal error: Oops: f3 [#1] Modules linked in: "snd_ice1724" "snd_ac97_codec" "snd_ac97_bus" "snd_ice17xx_ak4xxx" "snd_ak4xxx_adda" "snd_ak4114" "snd_mpu401_uart" "snd_usb_audio" "snd_usb_lib" "snd_rawmidi" "snd_hwdep" "snd_pcm_oss" "snd_pcm" "snd_timer" "snd_page_alloc" "snd_mixer_oss" "snd" "ixp400_eth" ixp400 CPU: 0 PC is at snd_pcm_mmap_data_nopage+0xc0/0xe4 ["snd_pcm"] LR is at 0x4034a000 pc : [<bf103358>] lr : [<4034a000>] Tainted: PF sp : c380de58 ip : cc33cc33 fp : c380de6c r10: c0021060 r9 : 00000800 r8 : 4034a000 r7 : c3421b80 r6 : c3ad5b1c r5 : c380de9c r4 : c3460c00 r3 : 00000093 r2 : 00000013 r1 : 00000000 r0 : c1af9040 Flags: nzcv IRQs off FIQs on Mode SVC_32 Segment user Control: 39FF Table: 03BD4000 DAC: 00000015 Process aplay (pid: 89, stack limit = 0xc380c198) Stack: (0xc380de58 to 0xc380e000) de40: 00000000 00000000 de60: c380dec8 c380de70 c006d9a0 bf1032a4 00000000 00000000 c0668bc0 c3c19020 de80: c0668bc0 c380dec8 c380de94 00000000 00000000 c3c8e000 c3bd5008 00000002 dea0: ffffffeb c3db73e0 c3ad5b1c c0021060 c0021094 c380dfb0 4034a000 c380df04 dec0: c380decc c003206c c006d6fc ffffffe7 0002ac00 00000800 00000817 ffffffff dee0: c037a164 00000817 c380dfb0 4034a000 4006f9f4 400d6eb4 c380dfac c380df08 df00: c00322dc c0031f98 c037bf08 c3445720 ffffffe7 0002ac00 00000000 c002ad24 df20: 400d6eb4 c380df40 c380df34 bf102d18 bf1023a4 c380df5c c380df44 c00904a8 df40: bf102cf8 00000004 c3445720 0002ac00 c380df84 c380df60 c0090784 c0090478 df60: c380df7c c380df70 c3445720 fffffff7 c0844123 00000036 c380dfa4 c380df88 df80: c00907e4 c0090500 00000000 ffffffff 00033880 0000176f 00000004 00000008 dfa0: 00000000 c380dfb0 c002ab28 c00322ac 00000040 00000000 00001770 00000000 dfc0: 4034a000 00033880 0000176f 00000004 00000008 4006f9f4 400d6eb4 00000000 dfe0: 00000020 bedcdab4 0001f108 4006f880 00000010 ffffffff 33cc33cc 33cc33cc Backtrace: [<bf103298>] (snd_pcm_mmap_data_nopage+0x0/0xe4 ["snd_pcm"]) from [<c006d9a0>] (__handle_mm_fault+0x2b0/0x810) r5 = 00000000 r4 = 00000000 [<c006d6f0>] (__handle_mm_fault+0x0/0x810) from [<c003206c>] (do_page_fault+0xe0/0x214) [<c0031f8c>] (do_page_fault+0x0/0x214) from [<c00322dc>] (do_DataAbort+0x3c/0xa0) [<c00322a0>] (do_DataAbort+0x0/0xa0) from [<c002ab28>] (ret_from_exception+0x0/0x10) r8 = 00000008 r7 = 00000004 r6 = 0000176F r5 = 00033880 r4 = FFFFFFFF Code: 1590c00c e10f2000 e3823080 e121f003 (e59c3004) ##################################################################### # USB audio device (snd_usb_audio), trace 1 ##################################################################### Unable to handle kernel paging request at virtual address 000040c0 pgd = c0004000 [000040c0] *pgd=00000000 Internal error: Oops: 0 [#1] Modules linked in: "snd_ice1724" "snd_ac97_codec" "snd_ac97_bus" "snd_ice17xx_ak4xxx" "snd_ak4xxx_adda" "snd_ak4114" "snd_mpu401_uart" "snd_usb_audio" "snd_usb_lib" "snd_rawmidi" "snd_hwdep" "snd_pcm_oss" "snd_pcm" "snd_timer" "snd_page_alloc" "snd_mixer_oss" "snd" "ixp400_eth" ixp400 CPU: 0 PC is at 0x40c0 LR is at __wake_up_common+0x50/0x78 pc : [<000040c0>] lr : [<c003dda4>] Tainted: PF sp : c0549de8 ip : c0000039 fp : c0549e10 r10: 00000003 r9 : c0549e2c r8 : 00000000 r7 : 000040c0 r6 : c00000c8 r5 : 000038c0 r4 : 00000001 r3 : c0549e2c r2 : 00000000 r1 : 00000003 r0 : c0000039 Flags: Nzcv IRQs off FIQs on Mode SVC_32 Segment kernel Control: 39FF Table: 007E8000 DAC: 00000017 Process pdflush (pid: 11, stack limit = 0xc0548198) Stack: (0xc0549de8 to 0xc054a000) 9de0: 80000013 00000003 c3e7cbbc c06ccc00 c3e7cc70 c0549f28 9e00: 00000000 c0549e28 c0549e14 c003ddf8 c003dd60 c0549e2c c3e7ccf4 c0549e40 9e20: c0549e2c c0054efc c003ddd8 c3e7ccf4 00000003 c0549e58 c0549e44 c0054f28 9e40: c0054ed8 00000001 00000000 c0549e68 c0549e5c c0097ca8 c0054f10 c0549ecc 9e60: c0549e6c c00a0ac8 c0097c9c c03e0868 0000001f 00040000 c0549eb4 c0549e88 9e80: c002bbb8 c004633c 00040000 c0549f28 ffffffff 0000001f c0549eb8 c0549ea8 9ea0: c010b13c c06ccc00 c3e7cbbc c066f1ac c0548000 c0549f28 c06ccc94 00000000 9ec0: c0549efc c0549ed0 c00a0f60 c00a07b4 ffffc58e c06ccc00 c06ccc3c c037d400 9ee0: c0549f28 c0549f28 00000000 fffffffc c0549f1c c0549f00 c00a11f8 c00a0d74 9f00: 00000449 ffffc782 c037bf08 c037cce8 c0549f80 c0549f20 c0066138 c00a1190 9f20: ffffb9d6 c03e1d70 00000000 00000000 c0549f20 00000400 00000000 00000000 9f40: 00000000 00000000 00000000 a0000000 00000008 00000000 000001da 00000000 9f60: 00000001 c0548000 c0549f88 c037cd34 c037bf08 c0549fc0 c0549f84 c0066c94 9f80: c0066088 00000001 c04b8060 c006607c 00000000 c0549f94 c0549f94 ffffc39a 9fa0: 00000000 c0548000 c04bbf64 c0066b34 00000001 c0549ff4 c0549fc4 c00548e0 9fc0: c0066b40 00000001 ffffffff ffffffff 00000000 00000000 00000000 00000000 9fe0: 00000000 00000000 00000000 c0549ff8 c004364c c0054800 76c4319c 134033ec Backtrace: [<c003dd54>] (__wake_up_common+0x0/0x78) from [<c003ddf8>] (__wake_up+0x2c/0x34) [<c003ddcc>] (__wake_up+0x0/0x34) from [<c0054efc>] (__wake_up_bit+0x30/0x38) r4 = C3E7CCF4 [<c0054ecc>] (__wake_up_bit+0x0/0x38) from [<c0054f28>] (wake_up_bit+0x24/0x28) [<c0054f04>] (wake_up_bit+0x0/0x28) from [<c0097ca8>] (wake_up_inode+0x18/0x1c) r5 = 00000000 r4 = 00000001 [<c0097c90>] (wake_up_inode+0x0/0x1c) from [<c00a0ac8>] (__writeback_single_inode+0x320/0x350) [<c00a07a8>] (__writeback_single_inode+0x0/0x350) from [<c00a0f60>] (sync_sb_inodes+0x1f8/0x2bc) [<c00a0d68>] (sync_sb_inodes+0x0/0x2bc) from [<c00a11f8>] (writeback_inodes+0x74/0xa4) [<c00a1184>] (writeback_inodes+0x0/0xa4) from [<c0066138>] (wb_kupdate+0xbc/0x138) r7 = C037CCE8 r6 = C037BF08 r5 = FFFFC782 r4 = 00000449 [<c006607c>] (wb_kupdate+0x0/0x138) from [<c0066c94>] (pdflush+0x160/0x234) r8 = C037BF08 r7 = C037CD34 r6 = C0549F88 r5 = C0548000 r4 = 00000001 [<c0066b34>] (pdflush+0x0/0x234) from [<c00548e0>] (kthread+0xec/0x11c) r8 = 00000001 r7 = C0066B34 r6 = C04BBF64 r5 = C0548000 r4 = 00000000 [<c00547f4>] (kthread+0x0/0x11c) from [<c004364c>] (do_exit+0x0/0x7b8) Code: bad PC value. ##################################################################### # USB audio device (snd_usb_audio), trace 2 ##################################################################### Unable to handle kernel paging request at virtual address 000040c0 pgd = c0004000 [000040c0] *pgd=00000000 Internal error: Oops: 0 [#1] Modules linked in: snd_usb_audio snd_usb_lib snd_rawmidi snd_hwdep snd_pcm_oss snd_pcm snd_timer snd_page_alloc snd_mixer_oss snd ixp400_eth ixp400 CPU: 0 PC is at 0x40c0 LR is at __wake_up_common+0x50/0x7c pc : [<000040c0>] lr : [<c003e21c>] Tainted: P sp : c0539d44 ip : c0000039 fp : c0539d6c r10: 00000003 r9 : c0539d88 r8 : 00000000 r7 : 00000001 r6 : c00000c8 r5 : 000040c0 r4 : 000038c0 r3 : c0539d88 r2 : 00000000 r1 : 00000003 r0 : c0000039 Flags: Nzcv IRQs off FIQs on Mode SVC_32 Segment kernel Control: 39FF Table: 03A1C000 DAC: 00000017 Process khubd (pid: 18, stack limit = 0xc0538194) Stack: (0xc0539d44 to 0xc053a000) 9d40: 80000013 00000003 c0673cc8 c038f698 c04e3000 c04e3000 00000002 9d60: c0539d84 c0539d70 c003e274 c003e1d8 c0539d88 c06aa390 c0539d9c c0539d88 9d80: c0056a4c c003e254 c06aa390 00000003 c0539db4 c0539da0 c0056a78 c0056a28 9da0: 00000000 c06aa28c c0539dc4 c0539db8 c009547c c0056a60 c0539ddc c0539dc8 9dc0: c0095a08 c0095470 c06aa28c c06732b0 c0539df0 c0539de0 c0094a90 c0095954 9de0: c06aa2fc c0539e00 c0539df4 c0093b18 c0094a1c c0539e28 c0539e04 c0262e14 9e00: c0093a80 c038f6c8 c06ae400 c06ae400 c038f698 c04e3000 00000002 c0539ee0 9e20: c0539e2c c02632bc c0262d40 c01e4c38 c0539e5c c0539e40 c01e405c c01e3fd0 9e40: c0697ee0 c01e407c c06ae400 c038f698 c0539e6c c0539e60 c01e4090 c01e3ff4 9e60: c0539e84 c0539e70 c01e4ca8 c01e4088 c0697ec0 c06ae400 c0539e94 c0539e88 9e80: c01e3fe0 c01e4c38 c0539ea4 c0539e98 c020ce04 c01e3fd0 c0539eb8 c0539ea8 9ea0: c020d3c4 c020cdf8 c038f688 c0539ee0 c0539ebc c0261dc0 c020d3b4 c01e4088 9ec0: c038f6c8 c06ae400 00000002 c038f698 c04e3000 c0539f00 c0539ee4 c0261e70 9ee0: c0262fb0 c06ae440 ffffffff c06ae400 c04e3240 c0539f10 c0539f04 c026203c 9f00: c0261e1c c0539f30 c0539f14 c0256d40 c026202c 00000501 00000000 c0671320 9f20: 00000003 c0539fc0 c0539f34 c0258a9c c0256c88 c0539f40 00000008 c067139d 9f40: c067134c c0671350 00000000 00000009 c06afa14 c04e3000 c06afa14 c06afa00 9f60: 00000000 c04dda60 c0056920 c0539f80 c0539f80 00000000 c04dda60 c0056920 9f80: c0539f80 c0539f80 00000000 05010000 00030501 c04ddb88 00000000 c0538000 9fa0: c04b3f5c c0258228 00000001 00000000 fffffffc c0539ff4 c0539fc4 c0056408 9fc0: c0258234 00000001 ffffffff ffffffff 00000000 00000000 00000000 00000000 9fe0: 00000000 00000000 00000000 c0539ff8 c00434e0 c005630c 76c4319c 134033ec Backtrace: [<c003e1cc>] (__wake_up_common+0x0/0x7c) from [<c003e274>] (__wake_up+0x2c/0x34) [<c003e248>] (__wake_up+0x0/0x34) from [<c0056a4c>] (__wake_up_bit+0x30/0x38) r4 = C06AA390 [<c0056a1c>] (__wake_up_bit+0x0/0x38) from [<c0056a78>] (wake_up_bit+0x24/0x28) [<c0056a54>] (wake_up_bit+0x0/0x28) from [<c009547c>] (wake_up_inode+0x18/0x1c) r5 = C06AA28C r4 = 00000000 [<c0095464>] (wake_up_inode+0x0/0x1c) from [<c0095a08>] (generic_delete_inode+0xc0/0xf4) [<c0095948>] (generic_delete_inode+0x0/0xf4) from [<c0094a90>] (iput+0x80/0x98) r5 = C06732B0 r4 = C06AA28C [<c0094a10>] (iput+0x0/0x98) from [<c0093b18>] (d_delete+0xa4/0xb8) r4 = C06AA2FC [<c0093a74>] (d_delete+0x0/0xb8) from [<c0262e14>] (fs_remove_file+0xe0/0x200) [<c0262d34>] (fs_remove_file+0x0/0x200) from [<c02632bc>] (usbfs_notify+0x318/0x3ac)[<c0262fa4>] (usbfs_notify+0x0/0x3ac) from [<c0261e70>] (usb_notifier_call_chain+0x60/0xa0) r8 = C04E3000 r7 = C038F698 r6 = 00000002 r5 = C06AE400 r4 = C038F6C8 [<c0261e10>] (usb_notifier_call_chain+0x0/0xa0) from [<c026203c>] (usb_notify_remove_device+0x1c/0x24) r7 = C04E3240 r6 = C06AE400 r5 = FFFFFFFF r4 = C06AE440 [<c0262020>] (usb_notify_remove_device+0x0/0x24) from [<c0256d40>] (usb_disconnect+0xc4/0x184) [<c0256c7c>] (usb_disconnect+0x0/0x184) from [<c0258a9c>] (hub_thread+0x874/0xbf8) r7 = 00000003 r6 = C0671320 r5 = 00000000 r4 = 00000501 [<c0258228>] (hub_thread+0x0/0xbf8) from [<c0056408>] (kthread+0x108/0x134) [<c0056300>] (kthread+0x0/0x134) from [<c00434e0>] (do_exit+0x0/0xb74) Code: bad PC value. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-devel
