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Subject[tip: x86/irq] x86/irq: Cleanup the arch_*_msi_irqs() leftovers
The following commit has been merged into the x86/irq branch of tip:

Commit-ID: 7ca435cf857dd63d29d5e0b785807f6988788d2f
Gitweb: https://git.kernel.org/tip/7ca435cf857dd63d29d5e0b785807f6988788d2f
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Wed, 26 Aug 2020 13:17:03 +02:00
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Wed, 16 Sep 2020 16:52:38 +02:00

x86/irq: Cleanup the arch_*_msi_irqs() leftovers

Get rid of all the gunk and remove the 'select PCI_MSI_ARCH_FALLBACK' from
the x86 Kconfig so the weak functions in the PCI core are replaced by stubs
which emit a warning, which ensures that any fail to set the irq domain
pointer results in a warning when the device is used.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20200826112334.086003720@linutronix.de
---
arch/x86/Kconfig | 1 -
arch/x86/include/asm/pci.h | 11 -----------
arch/x86/include/asm/x86_init.h | 1 -
arch/x86/kernel/apic/msi.c | 22 ----------------------
arch/x86/kernel/x86_init.c | 18 ------------------
arch/x86/pci/xen.c | 7 -------
6 files changed, 60 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 196e068..7101ac6 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -225,7 +225,6 @@ config X86
select NEED_SG_DMA_LENGTH
select PCI_DOMAINS if PCI
select PCI_LOCKLESS_CONFIG if PCI
- select PCI_MSI_ARCH_FALLBACKS
select PERF_EVENTS
select RTC_LIB
select RTC_MC146818_LIB
diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
index 7ccb338..d2c76c8 100644
--- a/arch/x86/include/asm/pci.h
+++ b/arch/x86/include/asm/pci.h
@@ -105,17 +105,6 @@ static inline void early_quirks(void) { }

extern void pci_iommu_alloc(void);

-#ifdef CONFIG_PCI_MSI
-/* implemented in arch/x86/kernel/apic/io_apic. */
-struct msi_desc;
-int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
-void native_teardown_msi_irq(unsigned int irq);
-void native_restore_msi_irqs(struct pci_dev *dev);
-#else
-#define native_setup_msi_irqs NULL
-#define native_teardown_msi_irq NULL
-#endif
-
/* generic pci stuff */
#include <asm-generic/pci.h>

diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index f96d600..d8b597c 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -277,7 +277,6 @@ 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);
void (*restore_msi_irqs)(struct pci_dev *dev);
};
diff --git a/arch/x86/kernel/apic/msi.c b/arch/x86/kernel/apic/msi.c
index 6fd3337..3b522b0 100644
--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -181,28 +181,6 @@ static struct irq_chip pci_msi_controller = {
.flags = IRQCHIP_SKIP_SET_WAKE,
};

-int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
-{
- struct irq_domain *domain;
- struct irq_alloc_info info;
-
- init_irq_alloc_info(&info, NULL);
- info.type = X86_IRQ_ALLOC_TYPE_PCI_MSI;
-
- domain = irq_remapping_get_irq_domain(&info);
- if (domain == NULL)
- domain = x86_pci_msi_default_domain;
- if (domain == NULL)
- return -ENOSYS;
-
- return msi_domain_alloc_irqs(domain, &dev->dev, nvec);
-}
-
-void native_teardown_msi_irq(unsigned int irq)
-{
- irq_domain_free_irqs(irq, 1);
-}
-
int pci_msi_prepare(struct irq_domain *domain, struct device *dev, int nvec,
msi_alloc_info_t *arg)
{
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index bb44ad8..a3038d8 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -146,28 +146,10 @@ EXPORT_SYMBOL_GPL(x86_platform);

#if defined(CONFIG_PCI_MSI)
struct x86_msi_ops x86_msi __ro_after_init = {
- .setup_msi_irqs = native_setup_msi_irqs,
- .teardown_msi_irq = native_teardown_msi_irq,
- .teardown_msi_irqs = default_teardown_msi_irqs,
.restore_msi_irqs = default_restore_msi_irqs,
};

/* MSI arch specific hooks */
-int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
-{
- return x86_msi.setup_msi_irqs(dev, nvec, type);
-}
-
-void arch_teardown_msi_irqs(struct pci_dev *dev)
-{
- x86_msi.teardown_msi_irqs(dev);
-}
-
-void arch_teardown_msi_irq(unsigned int irq)
-{
- x86_msi.teardown_msi_irq(irq);
-}
-
void arch_restore_msi_irqs(struct pci_dev *dev)
{
x86_msi.restore_msi_irqs(dev);
diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index 161f397..cb90095 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -402,11 +402,6 @@ static void xen_pv_teardown_msi_irqs(struct pci_dev *dev)
xen_teardown_msi_irqs(dev);
}

-static void xen_teardown_msi_irq(unsigned int irq)
-{
- WARN_ON_ONCE(1);
-}
-
static int xen_msi_domain_alloc_irqs(struct irq_domain *domain,
struct device *dev, int nvec)
{
@@ -483,8 +478,6 @@ static __init void xen_setup_pci_msi(void)
return;
}

- x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
-
/*
* Override the PCI/MSI irq domain init function. No point
* in allocating the native domain and never use it.
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