[patch V2 35/46] x86/irq: Cleanup the arch_*_msi_irqs() leftovers

[Thomas Gleixner <tglx@xxxxxxxxxxxxx>]

From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

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@xxxxxxxxxxxxx>
---
V2: Adjust to the PCI_MSI_ARCH_FALLBACK change, i.e. remove it instead
    of selecting the disabler.
---
 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(-)

--- 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
--- 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>
 
--- 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);
 };
--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -182,28 +182,6 @@ static struct irq_chip pci_msi_controlle
        .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)
 {
--- 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);
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -402,11 +402,6 @@ static void xen_pv_teardown_msi_irqs(str
        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(voi
                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.