PCI/MSI: Export all remapped MSIs to sysfs attributes

irqbalance uses sysfs attributes to populate its internal database, which
is then used to bind the IRQ to the appropriate NUMA node.

On a device accepting multiple MSIs and with interrupt remapping enabled,
only the first IRQ entry is exported in the "msi_irqs" directory.  This
results in irqbalance having no clue of the NUMA affinity for the extra
IRQs, so it can't bind them to the correct node.

Export all MSI interrupts as sysfs attributes when relevant.

[bhelgaas: changelog]
Signed-off-by: Romain Bezut <rbezut@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index d4497141d083a71d5d5206496fee58fbddc5cb13..324a1643fce2e7be334a63248c4ea0d0d8f543ae 100644 (file)
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -475,10 +475,11 @@ static int populate_msi_sysfs(struct pci_dev *pdev)
        int ret = -ENOMEM;
        int num_msi = 0;
        int count = 0;
+       int i;
 
        /* Determine how many msi entries we have */
        for_each_pci_msi_entry(entry, pdev)
-               ++num_msi;
+               num_msi += entry->nvec_used;
        if (!num_msi)
                return 0;
 
@@ -487,19 +488,21 @@ static int populate_msi_sysfs(struct pci_dev *pdev)
        if (!msi_attrs)
                return -ENOMEM;
        for_each_pci_msi_entry(entry, pdev) {
-               msi_dev_attr = kzalloc(sizeof(*msi_dev_attr), GFP_KERNEL);
-               if (!msi_dev_attr)
-                       goto error_attrs;
-               msi_attrs[count] = &msi_dev_attr->attr;
-
-               sysfs_attr_init(&msi_dev_attr->attr);
-               msi_dev_attr->attr.name = kasprintf(GFP_KERNEL, "%d",
-                                                   entry->irq);
-               if (!msi_dev_attr->attr.name)
-                       goto error_attrs;
-               msi_dev_attr->attr.mode = S_IRUGO;
-               msi_dev_attr->show = msi_mode_show;
-               ++count;
+               for (i = 0; i < entry->nvec_used; i++) {
+                       msi_dev_attr = kzalloc(sizeof(*msi_dev_attr), GFP_KERNEL);
+                       if (!msi_dev_attr)
+                               goto error_attrs;
+                       msi_attrs[count] = &msi_dev_attr->attr;
+
+                       sysfs_attr_init(&msi_dev_attr->attr);
+                       msi_dev_attr->attr.name = kasprintf(GFP_KERNEL, "%d",
+                                                           entry->irq + i);
+                       if (!msi_dev_attr->attr.name)
+                               goto error_attrs;
+                       msi_dev_attr->attr.mode = S_IRUGO;
+                       msi_dev_attr->show = msi_mode_show;
+                       ++count;
+               }
        }
 
        msi_irq_group = kzalloc(sizeof(*msi_irq_group), GFP_KERNEL);