[patch RFC 15/38] x86/msi: Use generic MSI domain ops

[Thomas Gleixner <tglx@xxxxxxxxxxxxx>]

pci_msi_get_hwirq() and pci_msi_set_desc are not longer special. Enable the
generic MSI domain ops in the core and PCI MSI code unconditionally and get
rid of the x86 specific implementations in the X86 MSI code and in the
hyperv PCI driver.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Wei Liu <wei.liu@xxxxxxxxxx>
Cc: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>
Cc: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
Cc: linux-pci@xxxxxxxxxxxxxxx
Cc: linux-hyperv@xxxxxxxxxxxxxxx
---
 arch/x86/include/asm/msi.h          |    2 --
 arch/x86/kernel/apic/msi.c          |   15 ---------------
 drivers/pci/controller/pci-hyperv.c |    8 --------
 drivers/pci/msi.c                   |    4 ----
 kernel/irq/msi.c                    |    6 ------
 5 files changed, 35 deletions(-)

--- a/arch/x86/include/asm/msi.h
+++ b/arch/x86/include/asm/msi.h
@@ -9,6 +9,4 @@ typedef struct irq_alloc_info msi_alloc_
 int pci_msi_prepare(struct irq_domain *domain, struct device *dev, int nvec,
                    msi_alloc_info_t *arg);
 
-void pci_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc);
-
 #endif /* _ASM_X86_MSI_H */
--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -204,12 +204,6 @@ void native_teardown_msi_irq(unsigned in
        irq_domain_free_irqs(irq, 1);
 }
 
-static irq_hw_number_t pci_msi_get_hwirq(struct msi_domain_info *info,
-                                        msi_alloc_info_t *arg)
-{
-       return arg->hwirq;
-}
-
 int pci_msi_prepare(struct irq_domain *domain, struct device *dev, int nvec,
                    msi_alloc_info_t *arg)
 {
@@ -228,17 +222,8 @@ int pci_msi_prepare(struct irq_domain *d
 }
 EXPORT_SYMBOL_GPL(pci_msi_prepare);
 
-void pci_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
-{
-       arg->desc = desc;
-       arg->hwirq = pci_msi_domain_calc_hwirq(desc);
-}
-EXPORT_SYMBOL_GPL(pci_msi_set_desc);
-
 static struct msi_domain_ops pci_msi_domain_ops = {
-       .get_hwirq      = pci_msi_get_hwirq,
        .msi_prepare    = pci_msi_prepare,
-       .set_desc       = pci_msi_set_desc,
 };
 
 static struct msi_domain_info pci_msi_domain_info = {
--- a/drivers/pci/controller/pci-hyperv.c
+++ b/drivers/pci/controller/pci-hyperv.c
@@ -1531,16 +1531,8 @@ static struct irq_chip hv_msi_irq_chip =
        .irq_unmask             = hv_irq_unmask,
 };
 
-static irq_hw_number_t hv_msi_domain_ops_get_hwirq(struct msi_domain_info 
*info,
-                                                  msi_alloc_info_t *arg)
-{
-       return arg->hwirq;
-}
-
 static struct msi_domain_ops hv_msi_ops = {
-       .get_hwirq      = hv_msi_domain_ops_get_hwirq,
        .msi_prepare    = pci_msi_prepare,
-       .set_desc       = pci_msi_set_desc,
        .msi_free       = hv_msi_free,
 };
 
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -1401,16 +1401,12 @@ static int pci_msi_domain_handle_error(s
        return error;
 }
 
-#ifdef GENERIC_MSI_DOMAIN_OPS
 static void pci_msi_domain_set_desc(msi_alloc_info_t *arg,
                                    struct msi_desc *desc)
 {
        arg->desc = desc;
        arg->hwirq = pci_msi_domain_calc_hwirq(desc);
 }
-#else
-#define pci_msi_domain_set_desc                NULL
-#endif
 
 static struct msi_domain_ops pci_msi_domain_ops_default = {
        .set_desc       = pci_msi_domain_set_desc,
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -187,7 +187,6 @@ static const struct irq_domain_ops msi_d
        .deactivate     = msi_domain_deactivate,
 };
 
-#ifdef GENERIC_MSI_DOMAIN_OPS
 static irq_hw_number_t msi_domain_ops_get_hwirq(struct msi_domain_info *info,
                                                msi_alloc_info_t *arg)
 {
@@ -206,11 +205,6 @@ static void msi_domain_ops_set_desc(msi_
 {
        arg->desc = desc;
 }
-#else
-#define msi_domain_ops_get_hwirq       NULL
-#define msi_domain_ops_prepare         NULL
-#define msi_domain_ops_set_desc                NULL
-#endif /* !GENERIC_MSI_DOMAIN_OPS */
 
 static int msi_domain_ops_init(struct irq_domain *domain,
                               struct msi_domain_info *info,