linux-kernel - [PATCH] intr-remap: allow disabling source id checking

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Date:	Fri, 23 Oct 2009 18:26:06 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	Weidong Han <weidong.han@...el.com>
Cc:	Suresh Siddha <suresh.b.siddha@...el.com>,
	iommu@...ts.linux-foundation.org,
	David Woodhouse <dwmw2@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] intr-remap: allow disabling source id checking

Allow users to disable source id checking.  This is really a debugging aid
for broken BIOS setups.

Signed-off-by: Chris Wright <chrisw@...s-sol.org>
---
 Documentation/kernel-parameters.txt |    7 +++++++
 drivers/pci/intr_remapping.c        |   20 ++++++++++++++++++++
 2 files changed, 27 insertions(+), 0 deletions(-)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 6fa7292..344256c 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -982,6 +982,12 @@ and is between 256 and 4096 characters. It is defined in the file
 			result in a hardware IOTLB flush operation as opposed
 			to batching them for performance.
 
+	intremap=	[X86-64, Intel-IOMMU]
+			Format: { on (default) | off | nosid }
+			on	enable Interrupt Remapping (default) 
+			off	disable Interrupt Remapping
+			nosid	disable Source ID checking
+
 	inttest=	[IA64]
 
 	iomem=		Disable strict checking of access to MMIO memory
@@ -1691,6 +1697,7 @@ and is between 256 and 4096 characters. It is defined in the file
 
 	nointremap	[X86-64, Intel-IOMMU] Do not enable interrupt
 			remapping.
+			[Deprecated - use intremap=off]
 
 	nointroute	[IA-64]
 
diff --git a/drivers/pci/intr_remapping.c b/drivers/pci/intr_remapping.c
index 0ed78a7..136bb6e 100644
--- a/drivers/pci/intr_remapping.c
+++ b/drivers/pci/intr_remapping.c
@@ -18,6 +18,8 @@ static int ir_ioapic_num;
 int intr_remapping_enabled;
 
 static int disable_intremap;
+static int disable_sourceid_checking;
+
 static __init int setup_nointremap(char *str)
 {
 	disable_intremap = 1;
@@ -25,6 +27,22 @@ static __init int setup_nointremap(char *str)
 }
 early_param("nointremap", setup_nointremap);
 
+static __init int setup_intremap(char *str)
+{
+	if (!str)
+		return -EINVAL;
+		
+	if (!strncmp(str, "on", 2))
+		disable_intremap = 0;
+	else if (!strncmp(str, "off", 3))
+		disable_intremap = 1;
+	else if (!strncmp(str, "nosid", 5))
+		disable_sourceid_checking = 1;
+
+	return 0;
+}
+early_param("intremap", setup_intremap);
+
 struct irq_2_iommu {
 	struct intel_iommu *iommu;
 	u16 irte_index;
@@ -440,6 +458,8 @@ int free_irte(int irq)
 static void set_irte_sid(struct irte *irte, unsigned int svt,
 			 unsigned int sq, unsigned int sid)
 {
+	if (disable_sourceid_checking)
+		svt = SVT_NO_VERIFY;
 	irte->svt = svt;
 	irte->sq = sq;
 	irte->sid = sid;
--
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