[xen staging] x86/msi: Change __msi_set_enable() to take pci_sbdf_t

[patchbot@xxxxxxx]

commit 250d87dc3ff9ebcb77da65e2999ace6b378862d7
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Sun Feb 2 13:48:40 2025 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Tue Feb 25 13:30:55 2025 +0000

    x86/msi: Change __msi_set_enable() to take pci_sbdf_t
    
    This removes the unnecessary work of splitting a 32-bit number across
    4 registers, and recombining later.  Bloat-o-meter reports:
    
      add/remove: 0/0 grow/shrink: 0/9 up/down: 0/-295 (-295)
      Function                                     old     new   delta
      enable_iommu                                1748    1732     -16
      iommu_msi_unmask                              98      81     -17
      iommu_msi_mask                               100      83     -17
      disable_iommu                                286     269     -17
      __msi_set_enable                              81      50     -31
      __pci_disable_msi                            178     146     -32
      pci_cleanup_msi                              268     229     -39
      pci_enable_msi                              1063    1019     -44
      pci_restore_msi_state                       1116    1034     -82
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/include/asm/msi.h           |  2 +-
 xen/arch/x86/msi.c                       | 14 ++++----------
 xen/drivers/passthrough/amd/iommu_init.c |  5 +++--
 3 files changed, 8 insertions(+), 13 deletions(-)

diff --git a/xen/arch/x86/include/asm/msi.h b/xen/arch/x86/include/asm/msi.h
index 7f9e531f73..378b85ee94 100644
--- a/xen/arch/x86/include/asm/msi.h
+++ b/xen/arch/x86/include/asm/msi.h
@@ -238,7 +238,7 @@ struct arch_msix {
 void early_msi_init(void);
 void msi_compose_msg(unsigned vector, const cpumask_t *cpu_mask,
                      struct msi_msg *msg);
-void __msi_set_enable(u16 seg, u8 bus, u8 slot, u8 func, int pos, int enable);
+void __msi_set_enable(pci_sbdf_t sbdf, int pos, int enable);
 void cf_check mask_msi_irq(struct irq_desc *desc);
 void cf_check unmask_msi_irq(struct irq_desc *desc);
 void guest_mask_msi_irq(struct irq_desc *desc, bool mask);
diff --git a/xen/arch/x86/msi.c b/xen/arch/x86/msi.c
index c9fe942c46..bf5b71822e 100644
--- a/xen/arch/x86/msi.c
+++ b/xen/arch/x86/msi.c
@@ -267,28 +267,22 @@ void cf_check set_msi_affinity(struct irq_desc *desc, 
const cpumask_t *mask)
     write_msi_msg(msi_desc, &msg);
 }
 
-void __msi_set_enable(u16 seg, u8 bus, u8 slot, u8 func, int pos, int enable)
+void __msi_set_enable(pci_sbdf_t sbdf, int pos, int enable)
 {
-    uint16_t control = pci_conf_read16(PCI_SBDF(seg, bus, slot, func),
-                                       pos + PCI_MSI_FLAGS);
+    uint16_t control = pci_conf_read16(sbdf, pos + PCI_MSI_FLAGS);
 
     control &= ~PCI_MSI_FLAGS_ENABLE;
     if ( enable )
         control |= PCI_MSI_FLAGS_ENABLE;
-    pci_conf_write16(PCI_SBDF(seg, bus, slot, func),
-                     pos + PCI_MSI_FLAGS, control);
+    pci_conf_write16(sbdf, pos + PCI_MSI_FLAGS, control);
 }
 
 static void msi_set_enable(struct pci_dev *dev, int enable)
 {
     unsigned int pos = dev->msi_pos;
-    u16 seg = dev->seg;
-    u8 bus = dev->bus;
-    u8 slot = PCI_SLOT(dev->devfn);
-    u8 func = PCI_FUNC(dev->devfn);
 
     if ( pos )
-        __msi_set_enable(seg, bus, slot, func, pos, enable);
+        __msi_set_enable(dev->sbdf, pos, enable);
 }
 
 static void msix_set_enable(struct pci_dev *dev, int enable)
diff --git a/xen/drivers/passthrough/amd/iommu_init.c 
b/xen/drivers/passthrough/amd/iommu_init.c
index 934adc5abe..bb25b55c85 100644
--- a/xen/drivers/passthrough/amd/iommu_init.c
+++ b/xen/drivers/passthrough/amd/iommu_init.c
@@ -409,8 +409,9 @@ static void iommu_reset_log(struct amd_iommu *iommu,
 
 static void amd_iommu_msi_enable(struct amd_iommu *iommu, int flag)
 {
-    __msi_set_enable(iommu->seg, PCI_BUS(iommu->bdf), PCI_SLOT(iommu->bdf),
-                     PCI_FUNC(iommu->bdf), iommu->msi.msi_attrib.pos, flag);
+    pci_sbdf_t sbdf = { .seg = iommu->seg, .bdf = iommu->bdf };
+
+    __msi_set_enable(sbdf, iommu->msi.msi_attrib.pos, flag);
 }
 
 static void cf_check iommu_msi_unmask(struct irq_desc *desc)
--
generated by git-patchbot for /home/xen/git/xen.git#staging