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iommu: Print strict or lazy mode at init time

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As well as the default domain type, it's useful to know whether strict
or lazy for DMA domains, so add this info in a separate print.

The (stict/lazy) mode may be also set via iommu.strict earlyparm, but
this will be processed prior to iommu_subsys_init(), so that print will be
accurate for drivers which don't set the mode via custom means.

For the drivers which set the mode via custom means - AMD and Intel drivers
- they maintain prints to inform a change in policy or that custom cmdline
methods to change policy are deprecated.

Signed-off-by: John Garry <john.garry@huawei.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/1626088340-5838-3-git-send-email-john.garry@huawei.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
John Garry 2021-07-12 19:12:16 +08:00 committed by Joerg Roedel
parent 1d479f160c
commit d8577d2e33
1 changed files with 5 additions and 0 deletions
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5
drivers/iommu/iommu.c
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@ -139,6 +139,11 @@ static int __init iommu_subsys_init(void)
(iommu_cmd_line & IOMMU_CMD_LINE_DMA_API) ? (iommu_cmd_line & IOMMU_CMD_LINE_DMA_API) ?
"(set via kernel command line)" : ""); "(set via kernel command line)" : "");
pr_info("DMA domain TLB invalidation policy: %s mode %s\n",
iommu_dma_strict ? "strict" : "lazy",
(iommu_cmd_line & IOMMU_CMD_LINE_STRICT) ?
"(set via kernel command line)" : "");
return 0; return 0;
} }
subsys_initcall(iommu_subsys_init); subsys_initcall(iommu_subsys_init);