Commit 3d708895 authored by Qian Cai's avatar Qian Cai Committed by Joerg Roedel

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: default avatarQian Cai <cai@lca.pw>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 93d05155
...@@ -2547,7 +2547,9 @@ static int map_sg(struct device *dev, struct scatterlist *sglist, ...@@ -2547,7 +2547,9 @@ static int map_sg(struct device *dev, struct scatterlist *sglist,
bus_addr = address + s->dma_address + (j << PAGE_SHIFT); bus_addr = address + s->dma_address + (j << PAGE_SHIFT);
phys_addr = (sg_phys(s) & PAGE_MASK) + (j << PAGE_SHIFT); phys_addr = (sg_phys(s) & PAGE_MASK) + (j << PAGE_SHIFT);
ret = iommu_map_page(domain, bus_addr, phys_addr, PAGE_SIZE, prot, GFP_ATOMIC); ret = iommu_map_page(domain, bus_addr, phys_addr,
PAGE_SIZE, prot,
GFP_ATOMIC | __GFP_NOWARN);
if (ret) if (ret)
goto out_unmap; goto out_unmap;
......
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