On Thu, Sep 10, 2015 at 10:47:07AM +0100, Felipe Tonello wrote: > Hi, > > I have the following setup: > > DSP (read sensors and read/send MIDI) <- UART -> SOC (imx6) <- USB > MIDI GADGET -> HOST > > When the throughput from the DSP is high, thus causing the throughput > on the USB to be high as well, I get a Kernel Panic saying to increase > the coherent_pool. I've used some crazy sizes like 1M, 4M and even 8M. > Obviously when I increase, it takes longer to crash but it still > crashes. > > I am using linux-fsl 3.14.28. > > The BT as follows: > > [ 193.619701] ERROR: 1024 KiB atomic DMA coherent pool is too small! > [ 193.619701] Please increase it with coherent_pool= kernel parameter! > [ 193.632261] Unable to handle kernel NULL pointer dereference at > virtual address 00000000 > [ 193.640358] pgd = 80004000 > [ 193.643070] [00000000] *pgd=00000000 > [ 193.646670] Internal error: Oops: 817 [#1] PREEMPT SMP ARM > [ 193.652162] Modules linked in:0d 0 :s0n2d:_5s2e.q2_2m1i > snd_seq_midi_event snd_seq_dummy snd_seq snd_soc_cs4272 > snd_soc_fsl_ssi imx_pcm_dma imx_pcm_fiq snd_soc_imx_cs4272 > snd_soc_core snd_compress snd_pcm_dmaengine snd_pcm snd_te > [ 193.689447] CPU: 2 PID: 16 Comm: ksoftirqd/2 Not tainted > 3.14.28-1.0.0_ga+g91cf351 #1 > [ 193.697285] task: ea0a5100 ti: ea0d8000 task.ti: ea0d8000 > [ 193.702708] PC is at _ep_queue.isra.24+0x178/0x480 > [ 193.707508] LR is at 0xc43cee80 > [ 193.710657] pc : [<8039ea38>] lr : [<c43cee80>] psr: 600f0093 > [ 193.710657] sp : ea0d9de0 ip : 6e0ea000 fp : ea0d9e1c > [ 193.722139] r10: 00005000 r9 : ea03c010 r8 : c43d05b4 > [ 193.727369] r7 : 00000000 r6 : 00000004 r5 : ea03c6f4 r4 : c43d0580 > [ 193.733899] r3 : c43d05bc r2 : 00000000 r1 : 00000001 r0 : fffffff4 > [ 193.740433] Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM > Segment kernel > [ 193.747834] Control: 10c5387d Table: 7aca804a DAC: 00000015 > [ 193.753585] Process ksoftirqd/2 (pid: 16, stack limit = 0xea0d8238) > [ 193.759857] Stack: (0xea0d9de0 to 0xea0da000) > [ 193.764225] 9de0: 00000001 eaa72480 a00f0013 c43d05bc ea0d9e24 > 00000003 ea03c6f4 a00f0013 > [ 193.772413] 9e00: c43d0580 ea51a200 ea51a328 ea51a328 ea0d9e3c > ea0d9e20 8039fc30 8039e8cc > [ 193.780598] 9e20: 00000000 00000000 c4467000 c43d0580 ea0d9e7c > ea0d9e40 7f078754 8039fbe8 > [ 193.788784] 9e40: ea03c6f4 ea51a2ec 80009990 6f000000 ea0d9e84 > ea51a330 ea51a334 00000000 > [ 193.796968] 9e60: 80718f40 00000000 ea0d8000 806d82bc ea0d9e8c > ea0d9e80 7f0787a0 7f07832c > [ 193.805153] 9e80: ea0d9ebc ea0d9e90 80031fe4 7f078798 80031f60 > 00000000 00000000 806dc080 > [ 193.826207] 9ec0: ffffffff ea0d9f0c 04208040 806dc0c0 ffffd672 > 80507358 0000000a 80718f40 > [ 193.834392] 9ee0: ea0d8000 806d8458 806dc080 00000002 80053c8c > ea0d8000 ea0870c0 806e9cc8 > [ 193.842576] 9f00: 00000001 00000000 00000000 00000000 ea0d9f34 > ea0d9f20 80032490 800321f0 > [ 193.868396] 9f40: ea087140 ea0870c0 800512e0 00000000 ea0d9fac > ea0d9f60 8004a458 800512ec > [ 193.876582] 9f60: 30b80088 00000001 00000002 ea0870c0 00000000 > 00030003 ea0d9f78 ea0d9f78 > [ 193.884766] 9f80: 00000000 00000000 ea0d9f88 ea0d9f88 ea087140 > 8004a384 00000000 00000000 > [ 193.892952] 9fa0: 00000000 ea0d9fb0 8000ea58 8004a390 00000000 > 00000000 00000000 00000000 > [ 193.901137] 9fc0: 00000000 00000000 00000000 00000000 00000000 > 00000000 00000000 00000000 > [ 193.909322] 9fe0: 00000000 00000000 00000000 00000000 00000013 > 00000000 2001a1a0 61391094 > [ 193.917501] Backtrace: > [ 193.919982] [<8039e8c0>] (_ep_queue.isra.24) from [<8039fc30>] > (ep_queue+0x54/0x88) > [ 193.927643] r10:ea51a328 r9:ea51a328 r8:ea51a200 r7:c43d0580 > r6:a00f0013 r5:ea03c6f4 > [ 193.935554] r4:00000003 > [ 193.938120] [<8039fbdc>] (ep_queue) from [<7f078754>] > (f_midi_transmit+0x434/0x46c [g_midi]) > [ 193.946562] r7:c43d0580 r6:c4467000 r5:00000000 r4:00000000 > [ 193.952299] [<7f078320>] (f_midi_transmit [g_midi]) from > [<7f0787a0>] (f_midi_in_tasklet+0x14/0x18 [g_midi]) > [ 193.962129] r10:806d82bc r9:ea0d8000 r8:00000000 r7:80718f40 > r6:00000000 r5:ea51a334 > [ 193.970039] r4:ea51a330 > [ 193.972609] [<7f07878c>] (f_midi_in_tasklet [g_midi]) from > [<80031fe4>] (tasklet_hi_action+0x84/0x114) > [ 193.981928] [<80031f60>] (tasklet_hi_action) from [<8003232c>] > (__do_softirq+0x148/0x260) > [ 193.990107] r10:40000000 r9:806dc080 r8:00000100 r7:ea0d8000 > r6:806dc080 r5:00000000 > [ 193.998018] r4:00000000 r3:80031f60 > [ 194.001635] [<800321e4>] (__do_softirq) from [<80032490>] > (run_ksoftirqd+0x4c/0x64) > [ 194.009294] r10:00000000 r9:00000000 r8:00000000 r7:00000001 > r6:806e9cc8 r5:ea0870c0 > [ 194.017203] r4:ea0d8000 > [ 194.019773] [<80032444>] (run_ksoftirqd) from [<80051468>] > (smpboot_thread_fn+0x188/0x278) > [ 194.028059] [<800512e0>] (smpboot_thread_fn) from [<8004a458>] > (kthread+0xd4/0xec) > [ 194.035632] r8:00000000 r7:800512e0 r6:ea0870c0 r5:ea087140 > r4:00000000 r3:ea0a5100 > [ 194.043468] [<8004a384>] (kthread) from [<8000ea58>] > (ret_from_fork+0x14/0x3c) > [ 194.050695] r7:00000000 r6:00000000 r5:8004a384 r4:ea087140 > [ 194.056426] Code: e3a01001 e594203c e50b2030 e593200c (e5821000) > [ 194.062529] ---[ end trace d9e83b0561ba691e ]--- > [ 194.067153] Kernel panic - not syncing: Fatal exception in interrupt > > Any help will be very useful. > Hi Felipe, Try to see if dma_pool_free at free_pending_td is much less than dma_pool_alloc at add_td_to_list -- Best Regards, Peter Chen -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
