On Montag, 1. Mai 2017 14:43:27 CEST Adrian Chadd wrote:
> This reverts b057886524be060021e3cfad0ba8458c850330cd in 2015
> which converted this allocation from dma_map_coherent() to
> kzalloc() / dma_map_single().
>
> The current problem manifests when using later model NICs with larger
> (>700KiB) scratch spaces in memory. Although the kzalloc call
> succeeds, the software IOMMU TLB code (via dma_map_single()) panics
> because it can't find 700KiB of linear physmem bounce buffers for DMA.
> Now, this is a bit of a silly failure mode for the dma map API,
> but it's what we currently have to play with.
[....]
>
> Signed-off-by: Adrian Chadd <adrian@xxxxxxxxxxx>
> ---
> drivers/net/wireless/ath/ath10k/wmi.c | 35 ++++++++++-------------------------
> 1 file changed, 10 insertions(+), 25 deletions(-)
Thanks for investigating this. This partial revert fixes following crash for
me with QCA99X0 on amd64 with SWIOMMU:
[ 9.167281] DMA: Out of SW-IOMMU space for 689816 bytes at device 0000:02:00.0
[ 9.174719] Kernel panic - not syncing: DMA: Random memory could be DMA read
[ 9.174719]
[ 9.183560] CPU: 0 PID: 133 Comm: kworker/u32:6 Tainted: P OE 4.9.0-0.bpo.2-amd64 #1 Debian 4.9.13-1~bpo8+1
[ 9.194666] Hardware name: Intel Corporation SandyBridge Platform/ETXe-SC T2 i3-2310E, BIOS CHR2R110 05/12/2011
[ 9.205033] Workqueue: ath10k_aux_wq ath10k_wmi_event_service_ready_work [ath10k_core]
[ 9.213151] 0000000000000000 ffffffffbd329cd5 0000000000000200 ffffa7b5c1247cb8
[ 9.220827] ffffffffbd17bc24 0000000000000008 ffffa7b5c1247cc8 ffffa7b5c1247c60
[ 9.228523] 000000006036bf02 0000000200000018 ffff91fde700dfc8 0000000000000000
[ 9.236177] Call Trace:
[ 9.238692] [<ffffffffbd329cd5>] ? dump_stack+0x5c/0x77
[ 9.244165] [<ffffffffbd17bc24>] ? panic+0xe8/0x236
[ 9.251161] [<ffffffffbd354ffc>] ? swiotlb_map_page+0x16c/0x190
[ 9.259219] [<ffffffffc0c1d3e5>] ? ath10k_wmi_event_service_ready_work+0x4d5/0x680 [ath10k_core]
[ 9.272150] [<ffffffffbd09171b>] ? process_one_work+0x14b/0x410
[ 9.280190] [<ffffffffbd0921d5>] ? worker_thread+0x65/0x4a0
[ 9.287869] [<ffffffffbd092170>] ? rescuer_thread+0x340/0x340
[ 9.295689] [<ffffffffbd0974c0>] ? kthread+0xe0/0x100
[ 9.302742] [<ffffffffbd02476b>] ? __switch_to+0x2bb/0x700
[ 9.310213] [<ffffffffbd0973e0>] ? kthread_park+0x60/0x60
[ 9.317556] [<ffffffffbd5fb675>] ? ret_from_fork+0x25/0x30
[ 9.324992] Kernel Offset: 0x3c000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[ 9.339429] ---[ end Kernel panic - not syncing: DMA: Random memory could be DMA read
[ 9.339429]
[ 9.353900] ------------[ cut here ]------------
[ 9.360274] WARNING: CPU: 0 PID: 133 at /home/zumbi/linux-4.9.13/arch/x86/kernel/smp.c:127 update_process_times+0x40/0x50
[ 9.374724] Modules linked in: tpm_infineon iTCO_wdt iTCO_vendor_support ppdev wl(POE) evdev intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel cryptd intel_cstate intel_uncore ath10k_pci ath10k_core intel_rapl_perf ath mac80211 i2c_kempld btusb btrtl btbcm btintel pcspkr bluetooth cfg80211 serio_raw rfkill snd_hda_codec_realtek snd_hda_codec_generic battery snd_hda_intel parport_pc parport snd_hda_codec i915 snd_hda_core snd_hwdep shpchp video drm_kms_helper snd_pcm snd_timer snd drm soundcore mei_me button mei i2c_i801 i2c_smbus lpc_ich tpm_tis tpm_tis_core ac tpm autofs4 ext4 crc16 jbd2 fscrypto mbcache sg sd_mod ata_generic ahci pata_jmicron libahci kempld_core mfd_core libata ehci_pci ehci_hcd scsi_mod crc32c_intel usbcore psmouse e1000e usb_common igb i2c_algo_bit dca ptp pps_core fan thermal fjes
[ 9.476736] CPU: 0 PID: 133 Comm: kworker/u32:6 Tainted: P OE 4.9.0-0.bpo.2-amd64 #1 Debian 4.9.13-1~bpo8+1
[ 9.491320] Hardware name: Intel Corporation SandyBridge Platform/ETXe-SC T2 i3-2310E, BIOS CHR2R110 05/12/2011
[ 9.505260] Workqueue: ath10k_aux_wq ath10k_wmi_event_service_ready_work [ath10k_core]
[ 9.517103] 0000000000000000 ffffffffbd329cd5 0000000000000000 0000000000000000
[ 9.528682] ffffffffbd0778a4 ffff91fde101a140 0000000000000000 ffffa7b5c1247b98
[ 9.540304] ffffffffbd0f7270 0000000000000003 ffff91fde7012580 ffffffffbd0e7dc0
[ 9.551962] Call Trace:
[ 9.556381] <IRQ> [ 9.558370] [<ffffffffbd329cd5>] ? dump_stack+0x5c/0x77
[ 9.567776] [<ffffffffbd0778a4>] ? __warn+0xc4/0xe0
[ 9.574863] [<ffffffffbd0f7270>] ? tick_sched_do_timer+0x30/0x30
[ 9.583059] [<ffffffffbd0e7dc0>] ? update_process_times+0x40/0x50
[ 9.591302] [<ffffffffbd0f6c80>] ? tick_sched_handle.isra.13+0x20/0x50
[ 9.600021] [<ffffffffbd0f72a8>] ? tick_sched_timer+0x38/0x70
[ 9.607872] [<ffffffffbd0e8a5c>] ? __hrtimer_run_queues+0xdc/0x250
[ 9.616158] [<ffffffffbd0e8ea9>] ? hrtimer_interrupt+0x99/0x190
[ 9.624100] [<ffffffffbd5fdd29>] ? smp_apic_timer_interrupt+0x39/0x50
[ 9.632618] [<ffffffffbd5fd042>] ? apic_timer_interrupt+0x82/0x90
[ 9.640700] <EOI> [ 9.642681] [<ffffffffbd17bd2e>] ? panic+0x1f2/0x236
[ 9.649615] [<ffffffffbd354ffc>] ? swiotlb_map_page+0x16c/0x190
[ 9.657526] [<ffffffffc0c1d3e5>] ? ath10k_wmi_event_service_ready_work+0x4d5/0x680 [ath10k_core]
[ 9.670007] [<ffffffffbd09171b>] ? process_one_work+0x14b/0x410
[ 9.677874] [<ffffffffbd0921d5>] ? worker_thread+0x65/0x4a0
[ 9.685388] [<ffffffffbd092170>] ? rescuer_thread+0x340/0x340
[ 9.693016] [<ffffffffbd0974c0>] ? kthread+0xe0/0x100
[ 9.699914] [<ffffffffbd02476b>] ? __switch_to+0x2bb/0x700
[ 9.707224] [<ffffffffbd0973e0>] ? kthread_park+0x60/0x60
[ 9.714363] [<ffffffffbd5fb675>] ? ret_from_fork+0x25/0x30
[ 9.721589] ---[ end trace 6814c79dfe2a14da ]---
Tested-by: Sven Eckelmann <sven.eckelmann@xxxxxxxxxxxx>
Kind regards,
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