PCI/MSI: Use msi_desc::msi_index

The usage of msi_desc::pci::entry_nr is confusing at best. It's the index
into the MSI[X] descriptor table.

Use msi_desc::msi_index which is shared between all MSI incarnations
instead of having a PCI specific storage for no value.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/20211210221814.602911509@linutronix.de

diff --git a/arch/powerpc/platforms/pseries/msi.c b/arch/powerpc/platforms/pseries/msi.c
index dc8cf36..27cd1fb 100644 (file)
--- a/arch/powerpc/platforms/pseries/msi.c
+++ b/arch/powerpc/platforms/pseries/msi.c
@@ -332,7 +332,7 @@ static int check_msix_entries(struct pci_dev *pdev)
 
        expected = 0;
        for_each_pci_msi_entry(entry, pdev) {
-               if (entry->pci.msi_attrib.entry_nr != expected) {
+               if (entry->msi_index != expected) {
                        pr_debug("rtas_msi: bad MSI-X entries.\n");
                        return -EINVAL;
                }
@@ -579,7 +579,7 @@ static int pseries_irq_domain_alloc(struct irq_domain *domain, unsigned int virq
        int hwirq;
        int i, ret;
 
-       hwirq = rtas_query_irq_number(pci_get_pdn(pdev), desc->pci.msi_attrib.entry_nr);
+       hwirq = rtas_query_irq_number(pci_get_pdn(pdev), desc->msi_index);
        if (hwirq < 0) {
                dev_err(&pdev->dev, "Failed to query HW IRQ: %d\n", hwirq);
                return hwirq;

diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index bfd87b4..ded0320 100644 (file)
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -306,7 +306,7 @@ static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
                                return -EINVAL;
 
                        map_irq.table_base = pci_resource_start(dev, bir);
-                       map_irq.entry_nr = msidesc->pci.msi_attrib.entry_nr;
+                       map_irq.entry_nr = msidesc->msi_index;
                }
 
                ret = -EINVAL;

diff --git a/drivers/pci/msi/irqdomain.c b/drivers/pci/msi/irqdomain.c
index 26b23a1..4224202 100644 (file)
--- a/drivers/pci/msi/irqdomain.c
+++ b/drivers/pci/msi/irqdomain.c
@@ -57,7 +57,7 @@ static irq_hw_number_t pci_msi_domain_calc_hwirq(struct msi_desc *desc)
 {
        struct pci_dev *dev = msi_desc_to_pci_dev(desc);
 
-       return (irq_hw_number_t)desc->pci.msi_attrib.entry_nr |
+       return (irq_hw_number_t)desc->msi_index |
                pci_dev_id(dev) << 11 |
                (pci_domain_nr(dev->bus) & 0xFFFFFFFF) << 27;
 }

diff --git a/drivers/pci/msi/msi.c b/drivers/pci/msi/msi.c
index 76c15be..8fb4dd2 100644 (file)
--- a/drivers/pci/msi/msi.c
+++ b/drivers/pci/msi/msi.c
@@ -44,7 +44,7 @@ static inline void pci_msi_unmask(struct msi_desc *desc, u32 mask)
 
 static inline void __iomem *pci_msix_desc_addr(struct msi_desc *desc)
 {
-       return desc->pci.mask_base + desc->pci.msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE;
+       return desc->pci.mask_base + desc->msi_index * PCI_MSIX_ENTRY_SIZE;
 }
 
 /*
@@ -394,13 +394,10 @@ msi_setup_entry(struct pci_dev *dev, int nvec, struct irq_affinity *affd)
        if (dev->dev_flags & PCI_DEV_FLAGS_HAS_MSI_MASKING)
                control |= PCI_MSI_FLAGS_MASKBIT;
 
-       entry->pci.msi_attrib.is_msix   = 0;
-       entry->pci.msi_attrib.is_64             = !!(control & PCI_MSI_FLAGS_64BIT);
-       entry->pci.msi_attrib.is_virtual    = 0;
-       entry->pci.msi_attrib.entry_nr  = 0;
+       entry->pci.msi_attrib.is_64     = !!(control & PCI_MSI_FLAGS_64BIT);
        entry->pci.msi_attrib.can_mask  = !pci_msi_ignore_mask &&
                                          !!(control & PCI_MSI_FLAGS_MASKBIT);
-       entry->pci.msi_attrib.default_irq       = dev->irq;     /* Save IOAPIC IRQ */
+       entry->pci.msi_attrib.default_irq = dev->irq;
        entry->pci.msi_attrib.multi_cap = (control & PCI_MSI_FLAGS_QMASK) >> 1;
        entry->pci.msi_attrib.multiple  = ilog2(__roundup_pow_of_two(nvec));
 
@@ -542,12 +539,11 @@ static int msix_setup_entries(struct pci_dev *dev, void __iomem *base,
                entry->pci.msi_attrib.is_64     = 1;
 
                if (entries)
-                       entry->pci.msi_attrib.entry_nr = entries[i].entry;
+                       entry->msi_index = entries[i].entry;
                else
-                       entry->pci.msi_attrib.entry_nr = i;
+                       entry->msi_index = i;
 
-               entry->pci.msi_attrib.is_virtual =
-                       entry->pci.msi_attrib.entry_nr >= vec_count;
+               entry->pci.msi_attrib.is_virtual = entry->msi_index >= vec_count;
 
                entry->pci.msi_attrib.can_mask  = !pci_msi_ignore_mask &&
                                                  !entry->pci.msi_attrib.is_virtual;
@@ -1088,7 +1084,7 @@ int pci_irq_vector(struct pci_dev *dev, unsigned int nr)
                struct msi_desc *entry;
 
                for_each_pci_msi_entry(entry, dev) {
-                       if (entry->pci.msi_attrib.entry_nr == nr)
+                       if (entry->msi_index == nr)
                                return entry->irq;
                }
                WARN_ON_ONCE(1);
@@ -1127,7 +1123,7 @@ const struct cpumask *pci_irq_get_affinity(struct pci_dev *dev, int nr)
                struct msi_desc *entry;
 
                for_each_pci_msi_entry(entry, dev) {
-                       if (entry->pci.msi_attrib.entry_nr == nr)
+                       if (entry->msi_index == nr)
                                return &entry->affinity->mask;
                }
                WARN_ON_ONCE(1);

diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
index 699cc95..bacf511 100644 (file)
--- a/drivers/pci/xen-pcifront.c
+++ b/drivers/pci/xen-pcifront.c
@@ -263,7 +263,7 @@ static int pci_frontend_enable_msix(struct pci_dev *dev,
 
        i = 0;
        for_each_pci_msi_entry(entry, dev) {
-               op.msix_entries[i].entry = entry->pci.msi_attrib.entry_nr;
+               op.msix_entries[i].entry = entry->msi_index;
                /* Vector is useless at this point. */
                op.msix_entries[i].vector = -1;
                i++;

diff --git a/include/linux/msi.h b/include/linux/msi.h
index 45ec5d0..b3d3b0b 100644 (file)
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -80,7 +80,6 @@ typedef void (*irq_write_msi_msg_t)(struct msi_desc *desc,
  * @multi_cap: [PCI MSI/X] log2 num of messages supported
  * @can_mask:  [PCI MSI/X] Masking supported?
  * @is_64:     [PCI MSI/X] Address size: 0=32bit 1=64bit
- * @entry_nr:  [PCI MSI/X] Entry which is described by this descriptor
  * @default_irq:[PCI MSI/X] The default pre-assigned non-MSI irq
  * @mask_pos:  [PCI MSI]   Mask register position
  * @mask_base: [PCI MSI-X] Mask register base address
@@ -97,7 +96,6 @@ struct pci_msi_desc {
                u8      can_mask        : 1;
                u8      is_64           : 1;
                u8      is_virtual      : 1;
-               u16     entry_nr;
                unsigned default_irq;
        } msi_attrib;
        union {