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From 14bdd0d36f5284108468bb73afd50726b07c7a84 Mon Sep 17 00:00:00 2001
From: Kyle McMartin <kyle@phobos.i.jkkm.org>
Date: Mon, 29 Mar 2010 23:43:49 -0400
Subject: linux-2.6-defaults-pci_no_msi
---
Documentation/kernel-parameters.txt | 3 +++
drivers/pci/Kconfig | 12 ++++++++++++
drivers/pci/msi.c | 9 +++++++++
drivers/pci/pci.c | 2 ++
drivers/pci/pci.h | 2 ++
5 files changed, 28 insertions(+), 0 deletions(-)
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index e4cbca5..8154a0f 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1911,6 +1911,9 @@ and is between 256 and 4096 characters. It is defined in the file
check_enable_amd_mmconf [X86] check for and enable
properly configured MMIO access to PCI
config space on AMD family 10h CPU
+ msi [MSI] If the PCI_MSI kernel config parameter is
+ enabled, this kernel boot option can be used to
+ enable the use of MSI interrupts system-wide.
nomsi [MSI] If the PCI_MSI kernel config parameter is
enabled, this kernel boot option can be used to
disable the use of MSI interrupts system-wide.
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index 7858a11..b12fcad 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -21,6 +21,18 @@ config PCI_MSI
If you don't know what to do here, say Y.
+config PCI_MSI_DEFAULT_ON
+ def_bool y
+ prompt "Use Message Signaled Interrupts by default"
+ depends on PCI_MSI
+ help
+ Selecting this option will enable use of PCI MSI where applicable
+ by default. Support for MSI can be disabled through the use of the
+ pci=nomsi boot flag. Conversely, if this option is not selected,
+ support for PCI MSI can be enabled by passing the pci=msi flag.
+
+ If you don't know what to do here, say N.
+
config PCI_DEBUG
bool "PCI Debugging"
depends on PCI && DEBUG_KERNEL
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index f9cf317..6b0539a 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -22,7 +22,11 @@
#include "pci.h"
#include "msi.h"
+#ifdef CONFIG_PCI_MSI_DEFAULT_ON
static int pci_msi_enable = 1;
+#else
+static int pci_msi_enable = 0;
+#endif /*CONFIG_PCI_MSI_DEFAULT_ON*/
/* Arch hooks */
@@ -836,6 +840,11 @@ int pci_msi_enabled(void)
}
EXPORT_SYMBOL(pci_msi_enabled);
+void pci_yes_msi(void)
+{
+ pci_msi_enable = 1;
+}
+
void pci_msi_init_pci_dev(struct pci_dev *dev)
{
INIT_LIST_HEAD(&dev->msi_list);
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 1531f3a..3cb332b 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -2983,6 +2983,8 @@ static int __init pci_setup(char *str)
if (*str && (str = pcibios_setup(str)) && *str) {
if (!strcmp(str, "nomsi")) {
pci_no_msi();
+ } else if (!strcmp(str, "msi")) {
+ pci_yes_msi();
} else if (!strcmp(str, "noaer")) {
pci_no_aer();
} else if (!strcmp(str, "nodomains")) {
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 4eb10f4..caa051e 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -122,9 +122,11 @@ extern unsigned int pci_pm_d3_delay;
#ifdef CONFIG_PCI_MSI
void pci_no_msi(void);
+void pci_yes_msi(void);
extern void pci_msi_init_pci_dev(struct pci_dev *dev);
#else
static inline void pci_no_msi(void) { }
+static inline void pci_yes_msi(void) { }
static inline void pci_msi_init_pci_dev(struct pci_dev *dev) { }
#endif
--
1.7.0.1
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