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 <[email protected]>
Reviewed-by: Robin Murphy <[email protected]>
---
drivers/iommu/iommu.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 5419c4b9f27a..cf58949cc2f3 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -138,6 +138,11 @@ static int __init iommu_subsys_init(void)
(iommu_cmd_line & IOMMU_CMD_LINE_DMA_API) ?
"(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;
}
subsys_initcall(iommu_subsys_init);
--
2.26.2
On 2021/6/18 19:34, John Garry wrote:
> 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 <[email protected]>
> Reviewed-by: Robin Murphy <[email protected]>
> ---
> drivers/iommu/iommu.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index 5419c4b9f27a..cf58949cc2f3 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -138,6 +138,11 @@ static int __init iommu_subsys_init(void)
> (iommu_cmd_line & IOMMU_CMD_LINE_DMA_API) ?
> "(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;
> }
> subsys_initcall(iommu_subsys_init);
>
Reviewed-by: Lu Baolu <[email protected]>
Best regards,
baolu