Hi, It took a little bit longer to integrate the patch, as I didn't figure out first how to implement the __dma_mmap_coherent() function for PPC systems with CONFIG_NOT_COHERENT_CACHE defined. :) Unfortunately my system still crashes within snd_pcm_mmap_data_nopage() (sound/core/pcm_native.c), as you can see below. I guess it tries to remap a DMA buffer allocated by the not cache coherent DMA memory allocation function in arch/ppc/kernel/dma-mapping.c. Jun 28 21:59:30 localhost kernel: [ 199.869609] Using dma_mmap_coherent for mmaping DMA buffer! Jun 28 21:59:30 localhost kernel: [ 199.925075] Oops: kernel access of bad area, sig: 11 [#1] Jun 28 21:59:30 localhost kernel: [ 199.925106] NIP: E226FF44 LR: E226FF94 CTR: E226FEA4 Jun 28 21:59:30 localhost kernel: [ 199.925116] REGS: d2577d30 TRAP: 0600 Not tainted (2.6.16.16-a1-2) Jun 28 21:59:30 localhost kernel: [ 199.925121] MSR: 00009032 <EE,ME,IR,DR> CR: 44048444 XER: 00000000 Jun 28 21:59:30 localhost kernel: [ 199.925134] DAR: 99A9999D, DSISR: 00000120 Jun 28 21:59:30 localhost kernel: [ 199.925140] TASK = d242cd10[4338] 'totem' THREAD: d2576000 Jun 28 21:59:30 localhost kernel: [ 199.925144] GPR00: 99A9999D D2577DE0 D242CD10 C0C826A0 00000000 D2577E08 D275F000 D36DC328 Jun 28 21:59:30 localhost kernel: [ 199.925158] GPR08: 02000000 00004000 00000000 99A99999 84048444 10054698 00000000 10196A58 Jun 28 21:59:30 localhost kernel: [ 199.925172] GPR16: 00000000 00000000 00000000 D36DC328 02000000 329FE000 00000000 00000000 Jun 28 21:59:30 localhost kernel: [ 199.925184] GPR24: DE5A6B20 DFA63C80 329FE000 DFA63C80 D20AD804 D275F7F8 D2576000 D2577E08 Jun 28 21:59:30 localhost kernel: [ 199.925199] NIP [E226FF44] snd_pcm_mmap_data_nopage+0xa0/0x12c [snd_pcm] Jun 28 21:59:30 localhost kernel: [ 199.925300] LR [E226FF94] snd_pcm_mmap_data_nopage+0xf0/0x12c [snd_pcm] Jun 28 21:59:30 localhost kernel: [ 199.925325] Call Trace: Jun 28 21:59:30 localhost kernel: [ 199.925330] [D2577DE0] [C0010050] update_mmu_cache+0xe4/0xf4 (unreliable) Jun 28 21:59:30 localhost kernel: [ 199.925361] [D2577E00] [C004F1D8] do_no_page+0xa4/0x6a4 Jun 28 21:59:30 localhost kernel: [ 199.925387] [D2577E60] [C004FA24] __handle_mm_fault+0x12c/0x328 Jun 28 21:59:30 localhost kernel: [ 199.925398] [D2577E90] [C000F740] do_page_fault+0x140/0x384 Jun 28 21:59:30 localhost kernel: [ 199.925407] [D2577F40] [C0004AC0] handle_page_fault+0xc/0x80 Jun 28 21:59:30 localhost kernel: [ 199.925423] Instruction dump: Jun 28 21:59:30 localhost kernel: [ 199.925427] 812a0218 3d60c038 800b938c 7d292214 3d294000 5529c9f4 7c604a14 80030000 Jun 28 21:59:30 localhost kernel: [ 199.925441] 7c6b1b78 70094000 40820044 380b0004 <7d200028> 31290001 7d20012d 40a2fff4 Comments? Thanks! Gerhard -------- Original-Nachricht -------- Datum: Wed, 14 Jun 2006 16:42:48 +0200 Von: Takashi Iwai <tiwai@xxxxxxx> An: Gerhard Pircher <gerhard_pircher@xxxxxxx> Betreff: Re: RFC: dma_mmap_coherent() for powerpc/ppc architecture and ALSA? > At Mon, 12 Jun 2006 16:42:54 +0200, > Gerhard Pircher wrote: > > > > > > But as far as I understand this would require a rewrite of all the > > > > ALSA drivers (or at least a rewrite of the ALSA's DMA helper > > > > functions). > > > > > > Yes. The change of ALSA side has been also on my tree. But it was > > > still pending since I'm not satisfied with the design yet. > > > If you're interested in it, let me know. I'll post the patch. > > > > Yes, please! Then I can test, if the dma_mmap_coherent() patch works on > > my non cache coherent powerpc machine. > > For using dma_mmap_coherent(), the patch below should suffice. > (Also you need to enable HAVE_DMA_MMAP_COHERENT there not only for > ARM.) > > > Do you think the DMA Layer/ALSA patches will go upstream in one of > > the next ALSA/Linux kernel versions? > > Definitely no 2.6.18 material yet. > > > Takashi -- Echte DSL-Flatrate dauerhaft für 0,- Euro*! "Feel free" mit GMX DSL! http://www.gmx.net/de/go/dsl Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-devel
