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