[v3 26/26] iommu/vt-d: Add a command line parameter for VT-d posted-interrupts

From: Feng Wu
Date: Fri Dec 12 2014 - 10:26:46 EST


Enable VT-d Posted-Interrtups and add a command line
parameter for it.

Signed-off-by: Feng Wu <feng.wu@xxxxxxxxx>
---
Documentation/kernel-parameters.txt | 1 +
drivers/iommu/irq_remapping.c | 12 ++++++++----
2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 838f377..324b790 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1453,6 +1453,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
nosid disable Source ID checking
no_x2apic_optout
BIOS x2APIC opt-out request will be ignored
+ nopost disable Interrupt Posting

iomem= Disable strict checking of access to MMIO memory
strict regions from userspace.
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index b008663..aa3cd23 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -24,7 +24,7 @@ int irq_remap_broken;
int disable_sourceid_checking;
int no_x2apic_optout;

-int disable_irq_post = 1;
+int disable_irq_post = 0;

static struct irq_remap_ops *remap_ops;

@@ -59,14 +59,18 @@ static __init int setup_irqremap(char *str)
return -EINVAL;

while (*str) {
- if (!strncmp(str, "on", 2))
+ if (!strncmp(str, "on", 2)) {
disable_irq_remap = 0;
- else if (!strncmp(str, "off", 3))
+ disable_irq_post = 0;
+ } else if (!strncmp(str, "off", 3)) {
disable_irq_remap = 1;
- else if (!strncmp(str, "nosid", 5))
+ disable_irq_post = 1;
+ } else if (!strncmp(str, "nosid", 5))
disable_sourceid_checking = 1;
else if (!strncmp(str, "no_x2apic_optout", 16))
no_x2apic_optout = 1;
+ else if (!strncmp(str, "nopost", 6))
+ disable_irq_post = 1;

str += strcspn(str, ",");
while (*str == ',')
--
1.9.1

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