Commit 0e4ccb150 added two __weak arch functions arch_msix_mask_irq()
and arch_msi_mask_irq() to fix a bug found when running xen in x86.
Introduced these two funcntions make MSI code complex. And mask/unmask
is the irq actions related to interrupt controller, should not use
weak arch functions to override mask/unmask interfaces. This patch
reverted commit 0e4ccb150 and export struct irq_chip msi_chip, modify
msi_chip-irq_mask/irq_unmask() in xen init functions to fix this
bug for simplicity. Also this is preparation for using struct
msi_chip instead of weak arch MSI functions in all platforms.
Signed-off-by: Yijing Wang wangyij...@huawei.com
CC: Konrad Rzeszutek Wilk konrad.w...@oracle.com
---
arch/x86/include/asm/apic.h |4
arch/x86/include/asm/x86_init.h |3 ---
arch/x86/kernel/apic/io_apic.c |2 +-
arch/x86/kernel/x86_init.c | 10 --
arch/x86/pci/xen.c | 16 ++--
drivers/pci/msi.c | 22 ++
include/linux/msi.h |4 ++--
7 files changed, 19 insertions(+), 42 deletions(-)
diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index 465b309..47a5f94 100644
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -43,6 +43,10 @@ static inline void generic_apic_probe(void)
}
#endif
+#ifdef CONFIG_PCI_MSI
+extern struct irq_chip msi_chip;
+#endif
+
#ifdef CONFIG_X86_LOCAL_APIC
extern unsigned int apic_verbosity;
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index e45e4da..f58a9c7 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -172,7 +172,6 @@ struct x86_platform_ops {
struct pci_dev;
struct msi_msg;
-struct msi_desc;
struct x86_msi_ops {
int (*setup_msi_irqs)(struct pci_dev *dev, int nvec, int type);
@@ -183,8 +182,6 @@ struct x86_msi_ops {
void (*teardown_msi_irqs)(struct pci_dev *dev);
void (*restore_msi_irqs)(struct pci_dev *dev);
int (*setup_hpet_msi)(unsigned int irq, unsigned int id);
- u32 (*msi_mask_irq)(struct msi_desc *desc, u32 mask, u32 flag);
- u32 (*msix_mask_irq)(struct msi_desc *desc, u32 flag);
};
struct IO_APIC_route_entry;
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index e877cfb..2a2ec28 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -3161,7 +3161,7 @@ msi_set_affinity(struct irq_data *data, const struct
cpumask *mask, bool force)
* IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
* which implement the MSI or MSI-X Capability Structure.
*/
-static struct irq_chip msi_chip = {
+struct irq_chip msi_chip = {
.name = PCI-MSI,
.irq_unmask = unmask_msi_irq,
.irq_mask = mask_msi_irq,
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index e48b674..234b072 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -116,8 +116,6 @@ struct x86_msi_ops x86_msi = {
.teardown_msi_irqs = default_teardown_msi_irqs,
.restore_msi_irqs = default_restore_msi_irqs,
.setup_hpet_msi = default_setup_hpet_msi,
- .msi_mask_irq = default_msi_mask_irq,
- .msix_mask_irq = default_msix_mask_irq,
};
/* MSI arch specific hooks */
@@ -140,14 +138,6 @@ void arch_restore_msi_irqs(struct pci_dev *dev)
{
x86_msi.restore_msi_irqs(dev);
}
-u32 arch_msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag)
-{
- return x86_msi.msi_mask_irq(desc, mask, flag);
-}
-u32 arch_msix_mask_irq(struct msi_desc *desc, u32 flag)
-{
- return x86_msi.msix_mask_irq(desc, flag);
-}
#endif
struct x86_io_apic_ops x86_io_apic_ops = {
diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index ad03739..84c2fce 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -394,13 +394,9 @@ static void xen_teardown_msi_irq(unsigned int irq)
{
xen_destroy_irq(irq);
}
-static u32 xen_nop_msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag)
-{
- return 0;
-}
-static u32 xen_nop_msix_mask_irq(struct msi_desc *desc, u32 flag)
+
+void xen_nop_msi_mask(struct irq_data *data)
{
- return 0;
}
#endif
@@ -425,8 +421,8 @@ int __init pci_xen_init(void)
x86_msi.setup_msi_irqs = xen_setup_msi_irqs;
x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs;
- x86_msi.msi_mask_irq = xen_nop_msi_mask_irq;
- x86_msi.msix_mask_irq = xen_nop_msix_mask_irq;
+ msi_chip.irq_mask = xen_nop_msi_mask;
+ msi_chip.irq_unmask = xen_nop_msi_mask;
#endif
return 0;
}
@@ -506,8 +502,8 @@ int __init pci_xen_initial_domain(void)
x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs;
x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
x86_msi.restore_msi_irqs =
