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path: root/drivers/pci/msi.c
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Diffstat (limited to 'drivers/pci/msi.c')
-rw-r--r--drivers/pci/msi.c46
1 files changed, 28 insertions, 18 deletions
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 79e56906c7f..944e45e4a84 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -313,22 +313,22 @@ static void __pci_restore_msix_state(struct pci_dev *dev)
if (!dev->msix_enabled)
return;
+ BUG_ON(list_empty(&dev->msi_list));
+ entry = list_entry(dev->msi_list.next, struct msi_desc, list);
+ pos = entry->msi_attrib.pos;
+ pci_read_config_word(dev, pos + PCI_MSIX_FLAGS, &control);
/* route the table */
pci_intx_for_msi(dev, 0);
- msix_set_enable(dev, 0);
+ control |= PCI_MSIX_FLAGS_ENABLE | PCI_MSIX_FLAGS_MASKALL;
+ pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control);
list_for_each_entry(entry, &dev->msi_list, list) {
write_msi_msg(entry->irq, &entry->msg);
msix_mask_irq(entry, entry->masked);
}
- BUG_ON(list_empty(&dev->msi_list));
- entry = list_entry(dev->msi_list.next, struct msi_desc, list);
- pos = entry->msi_attrib.pos;
- pci_read_config_word(dev, pos + PCI_MSIX_FLAGS, &control);
control &= ~PCI_MSIX_FLAGS_MASKALL;
- control |= PCI_MSIX_FLAGS_ENABLE;
pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control);
}
@@ -419,11 +419,14 @@ static int msix_capability_init(struct pci_dev *dev,
u8 bir;
void __iomem *base;
- msix_set_enable(dev, 0);/* Ensure msix is disabled as I set it up */
-
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
+ pci_read_config_word(dev, pos + PCI_MSIX_FLAGS, &control);
+
+ /* Ensure MSI-X is disabled while it is set up */
+ control &= ~PCI_MSIX_FLAGS_ENABLE;
+ pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control);
+
/* Request & Map MSI-X table region */
- pci_read_config_word(dev, msi_control_reg(pos), &control);
nr_entries = multi_msix_capable(control);
pci_read_config_dword(dev, msix_table_offset_reg(pos), &table_offset);
@@ -434,7 +437,6 @@ static int msix_capability_init(struct pci_dev *dev,
if (base == NULL)
return -ENOMEM;
- /* MSI-X Table Initialization */
for (i = 0; i < nvec; i++) {
entry = alloc_msi_entry(dev);
if (!entry)
@@ -447,7 +449,6 @@ static int msix_capability_init(struct pci_dev *dev,
entry->msi_attrib.default_irq = dev->irq;
entry->msi_attrib.pos = pos;
entry->mask_base = base;
- msix_mask_irq(entry, 1);
list_add_tail(&entry->list, &dev->msi_list);
}
@@ -472,22 +473,31 @@ static int msix_capability_init(struct pci_dev *dev,
return ret;
}
+ /*
+ * Some devices require MSI-X to be enabled before we can touch the
+ * MSI-X registers. We need to mask all the vectors to prevent
+ * interrupts coming in before they're fully set up.
+ */
+ control |= PCI_MSIX_FLAGS_MASKALL | PCI_MSIX_FLAGS_ENABLE;
+ pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control);
+
i = 0;
list_for_each_entry(entry, &dev->msi_list, list) {
entries[i].vector = entry->irq;
set_irq_msi(entry->irq, entry);
+ j = entries[i].entry;
+ entry->masked = readl(base + j * PCI_MSIX_ENTRY_SIZE +
+ PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET);
+ msix_mask_irq(entry, 1);
i++;
}
- /* Set MSI-X enabled bits */
+
+ /* Set MSI-X enabled bits and unmask the function */
pci_intx_for_msi(dev, 0);
- msix_set_enable(dev, 1);
dev->msix_enabled = 1;
- list_for_each_entry(entry, &dev->msi_list, list) {
- int vector = entry->msi_attrib.entry_nr;
- entry->masked = readl(base + vector * PCI_MSIX_ENTRY_SIZE +
- PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET);
- }
+ control &= ~PCI_MSIX_FLAGS_MASKALL;
+ pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control);
return 0;
}