iommu/amd: Document ivrs_ioapic and ivrs_hpet parameters

Document the new kernel commandline parameters in the appropriate file. Reviewed-by: Shuah Khan <shuahkhan@gmail.com> Signed-off-by: Joerg Roedel <joro@8bytes.org>

iommu/amd: Document ivrs_ioapic and ivrs_hpet parameters
Document the new kernel commandline parameters in the appropriate file. Reviewed-by: Shuah Khan <shuahkhan@gmail.com> Signed-off-by: Joerg Roedel <joro@8bytes.org>
Joerg Roedel
1 parent dfbb6d476d
Showing 1 changed file with 14 additions and 0 deletions Side-by-side Diff
Documentation/kernel-parameters.txt
@@ -1226,6 +1226,20 @@
  
 	iucv=		[HW,NET]
  
+	ivrs_ioapic	[HW,X86_64]
+			Provide an override to the IOAPIC-ID<->DEVICE-ID
+			mapping provided in the IVRS ACPI table. For
+			example, to map IOAPIC-ID decimal 10 to
+			PCI device 00:14.0 write the parameter as:
+				ivrs_ioapic[10]=00:14.0
+
+	ivrs_hpet	[HW,X86_64]
+			Provide an override to the HPET-ID<->DEVICE-ID
+			mapping provided in the IVRS ACPI table. For
+			example, to map HPET-ID decimal 0 to
+			PCI device 00:14.0 write the parameter as:
+				ivrs_hpet[0]=00:14.0
+
 	js=		[HW,JOY] Analog joystick
 			See Documentation/input/joystick.txt.
...	...	@@ -1226,6 +1226,20 @@
1226	1226
1227	1227	iucv= [HW,NET]
1228	1228
	1229	+ ivrs_ioapic [HW,X86_64]
	1230	+ Provide an override to the IOAPIC-ID<->DEVICE-ID
	1231	+ mapping provided in the IVRS ACPI table. For
	1232	+ example, to map IOAPIC-ID decimal 10 to
	1233	+ PCI device 00:14.0 write the parameter as:
	1234	+ ivrs_ioapic[10]=00:14.0
	1235	+
	1236	+ ivrs_hpet [HW,X86_64]
	1237	+ Provide an override to the HPET-ID<->DEVICE-ID
	1238	+ mapping provided in the IVRS ACPI table. For
	1239	+ example, to map HPET-ID decimal 0 to
	1240	+ PCI device 00:14.0 write the parameter as:
	1241	+ ivrs_hpet[0]=00:14.0
	1242	+
1229	1243	js= [HW,JOY] Analog joystick
1230	1244	See Documentation/input/joystick.txt.
1231	1245