iommu: Permit iommu.strict for AMD and Intel drivers

Permit AMD and intel drivers to use iommu.strict.

Note that both respective params are deprecated in kernel-parameters.txt .

Signed-off-by: John Garry <john.garry@huawei.com>

Documentation/admin-guide/kernel-parameters.txt

@@ -290,7 +290,8 @@
 	amd_iommu=	[HW,X86-64]
 			Pass parameters to the AMD IOMMU driver in the system.
 			Possible values are:
-			fullflush - enable flushing of IO/TLB entries when
+			fullflush - Deprecated, use iommu.strict instead.
+				    Enable flushing of IO/TLB entries when
 				    they are unmapped. Otherwise they are
 				    flushed before they will be reused, which
 				    is a lot of faster
@@ -1948,6 +1949,7 @@
 			this case, gfx device will use physical address for
 			DMA.
 		strict [Default Off]
+			Deprecated, use iommu.strict instead.
 			With this option on every unmap_single operation will
 			result in a hardware IOTLB flush operation as opposed
 			to batching them for performance.
@@ -2043,7 +2045,7 @@
 			  forcing Dual Address Cycle for PCI cards supporting
 			  greater than 32-bit addressing.
 
-	iommu.strict=	[ARM64] Configure TLB invalidation behaviour
+	iommu.strict=	[ARM64, X86] Configure TLB invalidation behaviour
 			Format: { "0" | "1" }
 			0 - Lazy mode.
 			  Request that DMA unmap operations use deferred

drivers/iommu/amd/init.c

@@ -3097,8 +3097,10 @@ static int __init parse_amd_iommu_intr(char *str)
 static int __init parse_amd_iommu_options(char *str)
 {
 	for (; *str; ++str) {
-		if (strncmp(str, "fullflush", 9) == 0)
+		if (strncmp(str, "fullflush", 9) == 0) {
+			pr_warn("amd_iommu=fullflush deprecated; use iommu.strict instead\n");
 			iommu_set_dma_strict(true);
+		}
 		if (strncmp(str, "force_enable", 12) == 0)
 			amd_iommu_force_enable = true;
 		if (strncmp(str, "off", 3) == 0)

drivers/iommu/intel/iommu.c

@@ -453,6 +453,7 @@ static int __init intel_iommu_setup(char *str)
 			pr_warn("intel_iommu=forcedac deprecated; use iommu.forcedac instead\n");
 			iommu_dma_forcedac = true;
 		} else if (!strncmp(str, "strict", 6)) {
+			pr_warn("intel_iommu=strict deprecated; use iommu.strict instead\n");
 			iommu_set_dma_strict(true);
 		} else if (!strncmp(str, "sp_off", 6)) {
 			pr_info("Disable supported super page\n");