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| author | Qian Cai <cai@lca.pw> | 2019-08-28 17:39:43 -0400 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2019-08-30 12:50:57 +0200 |
| commit | 3d708895325b78506e8daf00ef31549476e8586a (patch) | |
| tree | 13b6ca3ee41dfe19dd6b4ad5652af1798120e7c5 /Documentation/devicetree | |
| parent | 93d051550ee02eaff9a2541d825605a7bd778027 (diff) | |
| download | linux-3d708895325b78506e8daf00ef31549476e8586a.tar.bz2 | |
iommu/amd: Silence warnings under memory pressure
When running heavy memory pressure workloads, the system is throwing
endless warnings,
smartpqi 0000:23:00.0: AMD-Vi: IOMMU mapping error in map_sg (io-pages:
5 reason: -12)
Hardware name: HPE ProLiant DL385 Gen10/ProLiant DL385 Gen10, BIOS A40
07/10/2019
swapper/10: page allocation failure: order:0, mode:0xa20(GFP_ATOMIC),
nodemask=(null),cpuset=/,mems_allowed=0,4
Call Trace:
<IRQ>
dump_stack+0x62/0x9a
warn_alloc.cold.43+0x8a/0x148
__alloc_pages_nodemask+0x1a5c/0x1bb0
get_zeroed_page+0x16/0x20
iommu_map_page+0x477/0x540
map_sg+0x1ce/0x2f0
scsi_dma_map+0xc6/0x160
pqi_raid_submit_scsi_cmd_with_io_request+0x1c3/0x470 [smartpqi]
do_IRQ+0x81/0x170
common_interrupt+0xf/0xf
</IRQ>
because the allocation could fail from iommu_map_page(), and the volume
of this call could be huge which may generate a lot of serial console
output and cosumes all CPUs.
Fix it by silencing the warning in this call site, and there is still a
dev_err() later to notify the failure.
Signed-off-by: Qian Cai <cai@lca.pw>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'Documentation/devicetree')
0 files changed, 0 insertions, 0 deletions