diff options
Diffstat (limited to 'drivers/pci')
-rw-r--r-- | drivers/pci/msi.c | 122 |
1 files changed, 16 insertions, 106 deletions
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index 27a057409eca..75d1c0dacffa 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -933,7 +933,6 @@ int pci_msi_supported(struct pci_dev * dev) int pci_enable_msi(struct pci_dev* dev) { int pos, temp, status; - u16 control; if (pci_msi_supported(dev) < 0) return -EINVAL; @@ -948,27 +947,8 @@ int pci_enable_msi(struct pci_dev* dev) if (!pos) return -EINVAL; - if (!msi_lookup_vector(dev, PCI_CAP_ID_MSI)) { - /* Lookup Sucess */ - unsigned long flags; + WARN_ON(!msi_lookup_vector(dev, PCI_CAP_ID_MSI)); - pci_read_config_word(dev, msi_control_reg(pos), &control); - if (control & PCI_MSI_FLAGS_ENABLE) - return 0; /* Already in MSI mode */ - spin_lock_irqsave(&msi_lock, flags); - if (!vector_irq[dev->irq]) { - msi_desc[dev->irq]->msi_attrib.state = 0; - vector_irq[dev->irq] = -1; - nr_released_vectors--; - spin_unlock_irqrestore(&msi_lock, flags); - status = msi_register_init(dev, msi_desc[dev->irq]); - if (status == 0) - enable_msi_mode(dev, pos, PCI_CAP_ID_MSI); - return status; - } - spin_unlock_irqrestore(&msi_lock, flags); - dev->irq = temp; - } /* Check whether driver already requested for MSI-X vectors */ pos = pci_find_capability(dev, PCI_CAP_ID_MSIX); if (pos > 0 && !msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) { @@ -1010,6 +990,8 @@ void pci_disable_msi(struct pci_dev* dev) if (!(control & PCI_MSI_FLAGS_ENABLE)) return; + disable_msi_mode(dev, pos, PCI_CAP_ID_MSI); + spin_lock_irqsave(&msi_lock, flags); entry = msi_desc[dev->irq]; if (!entry || !entry->dev || entry->msi_attrib.type != PCI_CAP_ID_MSI) { @@ -1023,14 +1005,12 @@ void pci_disable_msi(struct pci_dev* dev) pci_name(dev), dev->irq); BUG_ON(entry->msi_attrib.state > 0); } else { - vector_irq[dev->irq] = 0; /* free it */ - nr_released_vectors++; default_vector = entry->msi_attrib.default_vector; spin_unlock_irqrestore(&msi_lock, flags); + msi_free_vector(dev, dev->irq, 0); + /* Restore dev->irq to its default pin-assertion vector */ dev->irq = default_vector; - disable_msi_mode(dev, pci_find_capability(dev, PCI_CAP_ID_MSI), - PCI_CAP_ID_MSI); } } @@ -1078,57 +1058,6 @@ static int msi_free_vector(struct pci_dev* dev, int vector, int reassign) return 0; } -static int reroute_msix_table(int head, struct msix_entry *entries, int *nvec) -{ - int vector = head, tail = 0; - int i, j = 0, nr_entries = 0; - void __iomem *base; - unsigned long flags; - - spin_lock_irqsave(&msi_lock, flags); - while (head != tail) { - nr_entries++; - tail = msi_desc[vector]->link.tail; - if (entries[0].entry == msi_desc[vector]->msi_attrib.entry_nr) - j = vector; - vector = tail; - } - if (*nvec > nr_entries) { - spin_unlock_irqrestore(&msi_lock, flags); - *nvec = nr_entries; - return -EINVAL; - } - vector = ((j > 0) ? j : head); - for (i = 0; i < *nvec; i++) { - j = msi_desc[vector]->msi_attrib.entry_nr; - msi_desc[vector]->msi_attrib.state = 0; /* Mark it not active */ - vector_irq[vector] = -1; /* Mark it busy */ - nr_released_vectors--; - entries[i].vector = vector; - if (j != (entries + i)->entry) { - base = msi_desc[vector]->mask_base; - msi_desc[vector]->msi_attrib.entry_nr = - (entries + i)->entry; - writel( readl(base + j * PCI_MSIX_ENTRY_SIZE + - PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET), base + - (entries + i)->entry * PCI_MSIX_ENTRY_SIZE + - PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET); - writel( readl(base + j * PCI_MSIX_ENTRY_SIZE + - PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET), base + - (entries + i)->entry * PCI_MSIX_ENTRY_SIZE + - PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET); - writel( (readl(base + j * PCI_MSIX_ENTRY_SIZE + - PCI_MSIX_ENTRY_DATA_OFFSET) & 0xff00) | vector, - base + (entries+i)->entry*PCI_MSIX_ENTRY_SIZE + - PCI_MSIX_ENTRY_DATA_OFFSET); - } - vector = msi_desc[vector]->link.tail; - } - spin_unlock_irqrestore(&msi_lock, flags); - - return 0; -} - /** * pci_enable_msix - configure device's MSI-X capability structure * @dev: pointer to the pci_dev data structure of MSI-X device function @@ -1163,9 +1092,6 @@ int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec) return -EINVAL; pci_read_config_word(dev, msi_control_reg(pos), &control); - if (control & PCI_MSIX_FLAGS_ENABLE) - return -EINVAL; /* Already in MSI-X mode */ - nr_entries = multi_msix_capable(control); if (nvec > nr_entries) return -EINVAL; @@ -1180,19 +1106,8 @@ int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec) } } temp = dev->irq; - if (!msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) { - /* Lookup Sucess */ - nr_entries = nvec; - /* Reroute MSI-X table */ - if (reroute_msix_table(dev->irq, entries, &nr_entries)) { - /* #requested > #previous-assigned */ - dev->irq = temp; - return nr_entries; - } - dev->irq = temp; - enable_msi_mode(dev, pos, PCI_CAP_ID_MSIX); - return 0; - } + WARN_ON(!msi_lookup_vector(dev, PCI_CAP_ID_MSIX)); + /* Check whether driver already requested for MSI vector */ if (pci_find_capability(dev, PCI_CAP_ID_MSI) > 0 && !msi_lookup_vector(dev, PCI_CAP_ID_MSI)) { @@ -1251,37 +1166,32 @@ void pci_disable_msix(struct pci_dev* dev) if (!(control & PCI_MSIX_FLAGS_ENABLE)) return; + disable_msi_mode(dev, pos, PCI_CAP_ID_MSIX); + temp = dev->irq; if (!msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) { int state, vector, head, tail = 0, warning = 0; unsigned long flags; vector = head = dev->irq; - spin_lock_irqsave(&msi_lock, flags); + dev->irq = temp; /* Restore pin IRQ */ while (head != tail) { + spin_lock_irqsave(&msi_lock, flags); state = msi_desc[vector]->msi_attrib.state; + tail = msi_desc[vector]->link.tail; + spin_unlock_irqrestore(&msi_lock, flags); if (state) warning = 1; - else { - vector_irq[vector] = 0; /* free it */ - nr_released_vectors++; - } - tail = msi_desc[vector]->link.tail; + else if (vector != head) /* Release MSI-X vector */ + msi_free_vector(dev, vector, 0); vector = tail; } - spin_unlock_irqrestore(&msi_lock, flags); + msi_free_vector(dev, vector, 0); if (warning) { - dev->irq = temp; printk(KERN_WARNING "PCI: %s: pci_disable_msix() called without " "free_irq() on all MSI-X vectors\n", pci_name(dev)); BUG_ON(warning > 0); - } else { - dev->irq = temp; - disable_msi_mode(dev, - pci_find_capability(dev, PCI_CAP_ID_MSIX), - PCI_CAP_ID_MSIX); - } } } |