Subject: Re: amd-xgbe e0700000.xgmac: DMA-API: device driver tries to sync DMA memory it has not allocated

From: Tom Lendacky <[email-masked]>
Date: Thu, 2 Jul 2015 18:54:55 -0500

On 07/02/2015 02:02 PM, Kim Phillips wrote:
> Hi Tom,
>
> A pristine 4.1 kernel with CONFIG_DMA_API_DEBUG=y produces this call
> trace on an AMD Seattle:
>
> [  112.896576] ------------[ cut here ]------------
> [  112.896591] WARNING: CPU: 2 PID: 1059 at lib/dma-debug.c:1202 check_sync+0x138/0x56c()
> [  112.896597] amd-xgbe e0700000.xgmac: DMA-API: device driver tries to sync DMA memory it has not allocated [device address=0x0000008003d52000] [size=1536 bytes]
> [  112.896600] Modules linked in: cpufreq_stats vfat fat xfs libcrc32c spi_pl022 aes_ce_blk ablk_helper cryptd aes_ce_cipher ghash_ce sha2_ce sha1_ce uio_pdrv_genirq uio fuse
> [  112.896634] CPU: 2 PID: 1059 Comm: sshd Tainted: G        W       4.1.0 #10
> [  112.896638] Hardware name: Default string Default string/Default string, BIOS ROD0082B 06/16/2015
> [  112.896641] Call trace:
> [  112.899086] [<fffffe0000097b20>] dump_backtrace+0x0/0x170
> [  112.899091] [<fffffe0000097cb0>] show_stack+0x20/0x2c
> [  112.899097] [<fffffe0000813da0>] dump_stack+0x8c/0xc4
> [  112.899102] [<fffffe00000c45bc>] warn_slowpath_common+0xa0/0xd8
> [  112.899106] [<fffffe00000c4668>] warn_slowpath_fmt+0x74/0x88
> [  112.899109] [<fffffe0000486f24>] check_sync+0x134/0x56c
> [  112.899113] [<fffffe00004873ac>] debug_dma_sync_single_for_cpu+0x50/0x5c
> [  112.899119] [<fffffe00005b07fc>] xgbe_rx_poll+0x1e0/0x6c0
> [  112.899123] [<fffffe00005b1cdc>] xgbe_one_poll+0x34/0x6c
> [  112.899128] [<fffffe00006a510c>] net_rx_action+0x270/0x504
> [  112.899133] [<fffffe00000c9ba0>] __do_softirq+0x120/0x60c
> [  112.899136] [<fffffe00000ca3fc>] irq_exit+0xa4/0xe4
> [  112.899143] [<fffffe000012d2f8>] __handle_domain_irq+0x74/0xc4
> [  112.899146] [<fffffe00000903ec>] gic_handle_irq+0x38/0x84
> [  112.899150] Exception stack(0xfffffe03de09bbf0 to 0xfffffe03de09bd10)
> [  112.899154] bbe0:                                     1ee64b30 fffffe00 002111e8 fffffe00
> [  112.899158] bc00: de09bd30 fffffe03 0081a668 fffffe00 dd54fa00 fffffe03 de09bcb0 fffffe03
> [  112.899162] bc20: 00000001 ffffffff 00000001 00000000 00000000 00000000 00000000 00000000
> [  112.899166] bc40: 00000000 00000000 002111e8 fffffe00 00000000 00000000 de098000 fffffe03
> [  112.899170] bc60: de09bc10 fffffe03 1d456228 00000000 00000076 00000000 00000008 00000000
> [  112.899174] bc80: 10000000 00077d2a 00000000 001dcd65 00213e98 fffffe00 96ea8f60 000003ff
> [  112.899178] bca0: 65b9a2e2 00000000 1ee64b30 fffffe00 002111e8 fffffe00 1ee64ba0 fffffe00
> [  112.899181] bcc0: 00000041 00000000 1ee10b80 fffffe00 025c58c8 fffffe00 00000003 00000000
> [  112.899185] bce0: 027b6c48 fffffe00 00100077 00000000 02ab0b4b 00000000 de09bd30 fffffe03
> [  112.899188] bd00: 0081a660 fffffe00 de09bd30 fffffe03
> [  112.899192] [<fffffe00000934e8>] el1_irq+0x68/0x100
> [  112.899198] [<fffffe00002111e4>] validate_mm+0x44/0x2d4
> [  112.899203] [<fffffe0000211edc>] vma_link+0x98/0xe0
> [  112.899206] [<fffffe0000213e70>] do_brk+0x2ec/0x314
> [  112.899209] [<fffffe0000213fd4>] SyS_brk+0x13c/0x170
> [  112.899212] ---[ end trace cbf36648db00d232 ]---
>
> Can you look into it?

Sorry about the top posting earlier.  Should have a fix sent to the list
early next week.

Thanks,
Tom

>
> Thanks,
>
> Kim
>
>
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