From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Introduce an x86 specific indirect mechanism to setup MSIs.
The MSI setup functions become function pointers in an x86_msi_ops
struct, that defaults to the implementation in io_apic.c and msi.c.
[v2: Use HAVE_DEFAULT_* knobs]
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: x86@xxxxxxxxxx
Cc: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
---
arch/x86/include/asm/pci.h | 33 +++++++++++++++++++++++++++++++--
arch/x86/include/asm/x86_init.h | 9 +++++++++
arch/x86/kernel/apic/io_apic.c | 4 ++--
arch/x86/kernel/x86_init.c | 7 +++++++
4 files changed, 49 insertions(+), 4 deletions(-)
diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
index d395540..ca0437c 100644
--- a/arch/x86/include/asm/pci.h
+++ b/arch/x86/include/asm/pci.h
@@ -7,6 +7,7 @@
#include <linux/string.h>
#include <asm/scatterlist.h>
#include <asm/io.h>
+#include <asm/x86_init.h>
#ifdef __KERNEL__
@@ -94,8 +95,36 @@ static inline void early_quirks(void) { }
extern void pci_iommu_alloc(void);
-/* MSI arch hook */
-#define arch_setup_msi_irqs arch_setup_msi_irqs
+#ifdef CONFIG_PCI_MSI
+/* MSI arch specific hooks */
+static inline int x86_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
+{
+ return x86_msi.setup_msi_irqs(dev, nvec, type);
+}
+
+static inline void x86_teardown_msi_irqs(struct pci_dev *dev)
+{
+ x86_msi.teardown_msi_irqs(dev);
+}
+
+static inline void x86_teardown_msi_irq(unsigned int irq)
+{
+ x86_msi.teardown_msi_irq(irq);
+}
+#define arch_setup_msi_irqs x86_setup_msi_irqs
+#define arch_teardown_msi_irqs x86_teardown_msi_irqs
+#define arch_teardown_msi_irq x86_teardown_msi_irq
+/* implemented in arch/x86/kernel/apic/io_apic. */
+int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
+void native_teardown_msi_irq(unsigned int irq);
+/* default to the implementation in drivers/lib/msi.c */
+#define HAVE_DEFAULT_MSI_TEARDOWN_IRQS
+void default_teardown_msi_irqs(struct pci_dev *dev);
+#else
+#define native_setup_msi_irqs NULL
+#define native_teardown_msi_irq NULL
+#define default_teardown_msi_irqs NULL
+#endif
#define PCI_DMA_BUS_IS_PHYS (dma_ops->is_phys)
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index baa579c..64642ad 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -154,9 +154,18 @@ struct x86_platform_ops {
int (*i8042_detect)(void);
};
+struct pci_dev;
+
+struct x86_msi_ops {
+ int (*setup_msi_irqs)(struct pci_dev *dev, int nvec, int type);
+ void (*teardown_msi_irq)(unsigned int irq);
+ void (*teardown_msi_irqs)(struct pci_dev *dev);
+};
+
extern struct x86_init_ops x86_init;
extern struct x86_cpuinit_ops x86_cpuinit;
extern struct x86_platform_ops x86_platform;
+extern struct x86_msi_ops x86_msi;
extern void x86_init_noop(void);
extern void x86_init_uint_noop(unsigned int unused);
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 4c9b2b9..1bfc6d1 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -3533,7 +3533,7 @@ static int setup_msi_irq(struct pci_dev *dev, struct
msi_desc *msidesc, int irq)
return 0;
}
-int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
+int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
{
unsigned int irq;
int ret, sub_handle;
@@ -3594,7 +3594,7 @@ error:
return ret;
}
-void arch_teardown_msi_irq(unsigned int irq)
+void native_teardown_msi_irq(unsigned int irq)
{
destroy_irq(irq);
}
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index cd6da6b..ceb2911 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -6,10 +6,12 @@
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/module.h>
+#include <linux/pci.h>
#include <asm/bios_ebda.h>
#include <asm/paravirt.h>
#include <asm/pci_x86.h>
+#include <asm/pci.h>
#include <asm/mpspec.h>
#include <asm/setup.h>
#include <asm/apic.h>
@@ -99,3 +101,8 @@ struct x86_platform_ops x86_platform = {
};
EXPORT_SYMBOL_GPL(x86_platform);
+struct x86_msi_ops x86_msi = {
+ .setup_msi_irqs = native_setup_msi_irqs,
+ .teardown_msi_irq = native_teardown_msi_irq,
+ .teardown_msi_irqs = default_teardown_msi_irqs,
+};
--
1.7.0.4
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