diff options
Diffstat (limited to 'drivers/pci/msi.c')
| -rw-r--r-- | drivers/pci/msi.c | 101 |
1 files changed, 41 insertions, 60 deletions
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index 955ab7990c5b..13f3d3037272 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -10,7 +10,6 @@ #include <linux/mm.h> #include <linux/irq.h> #include <linux/interrupt.h> -#include <linux/init.h> #include <linux/export.h> #include <linux/ioport.h> #include <linux/pci.h> @@ -414,7 +413,7 @@ static void free_msi_irqs(struct pci_dev *dev) if (dev->msi_irq_groups) { sysfs_remove_groups(&dev->dev.kobj, dev->msi_irq_groups); msi_attrs = dev->msi_irq_groups[0]->attrs; - list_for_each_entry(entry, &dev->msi_list, list) { + while (msi_attrs[count]) { dev_attr = container_of(msi_attrs[count], struct device_attribute, attr); kfree(dev_attr->attr.name); @@ -544,22 +543,18 @@ static int populate_msi_sysfs(struct pci_dev *pdev) if (!msi_attrs) return -ENOMEM; list_for_each_entry(entry, &pdev->msi_list, list) { - char *name = kmalloc(20, GFP_KERNEL); - if (!name) - goto error_attrs; - msi_dev_attr = kzalloc(sizeof(*msi_dev_attr), GFP_KERNEL); - if (!msi_dev_attr) { - kfree(name); + if (!msi_dev_attr) goto error_attrs; - } + msi_attrs[count] = &msi_dev_attr->attr; - sprintf(name, "%d", entry->irq); sysfs_attr_init(&msi_dev_attr->attr); - msi_dev_attr->attr.name = name; + 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; - msi_attrs[count] = &msi_dev_attr->attr; ++count; } @@ -883,50 +878,6 @@ int pci_msi_vec_count(struct pci_dev *dev) } EXPORT_SYMBOL(pci_msi_vec_count); -/** - * pci_enable_msi_block - configure device's MSI capability structure - * @dev: device to configure - * @nvec: number of interrupts to configure - * - * Allocate IRQs for a device with the MSI capability. - * This function returns a negative errno if an error occurs. If it - * is unable to allocate the number of interrupts requested, it returns - * the number of interrupts it might be able to allocate. If it successfully - * allocates at least the number of interrupts requested, it returns 0 and - * updates the @dev's irq member to the lowest new interrupt number; the - * other interrupt numbers allocated to this device are consecutive. - */ -int pci_enable_msi_block(struct pci_dev *dev, int nvec) -{ - int status, maxvec; - - if (dev->current_state != PCI_D0) - return -EINVAL; - - maxvec = pci_msi_vec_count(dev); - if (maxvec < 0) - return maxvec; - if (nvec > maxvec) - return maxvec; - - status = pci_msi_check_device(dev, nvec, PCI_CAP_ID_MSI); - if (status) - return status; - - WARN_ON(!!dev->msi_enabled); - - /* Check whether driver already requested MSI-X irqs */ - if (dev->msix_enabled) { - dev_info(&dev->dev, "can't enable MSI " - "(MSI-X already enabled)\n"); - return -EINVAL; - } - - status = msi_capability_init(dev, nvec); - return status; -} -EXPORT_SYMBOL(pci_enable_msi_block); - void pci_msi_shutdown(struct pci_dev *dev) { struct msi_desc *desc; @@ -1029,8 +980,7 @@ int pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries, int nvec) /* Check whether driver already requested for MSI irq */ if (dev->msi_enabled) { - dev_info(&dev->dev, "can't enable MSI-X " - "(MSI IRQ already assigned)\n"); + dev_info(&dev->dev, "can't enable MSI-X (MSI IRQ already assigned)\n"); return -EINVAL; } status = msix_capability_init(dev, entries, nvec); @@ -1132,14 +1082,45 @@ void pci_msi_init_pci_dev(struct pci_dev *dev) **/ int pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec) { - int nvec = maxvec; + int nvec; int rc; + if (dev->current_state != PCI_D0) + return -EINVAL; + + WARN_ON(!!dev->msi_enabled); + + /* Check whether driver already requested MSI-X irqs */ + if (dev->msix_enabled) { + dev_info(&dev->dev, + "can't enable MSI (MSI-X already enabled)\n"); + return -EINVAL; + } + if (maxvec < minvec) return -ERANGE; + nvec = pci_msi_vec_count(dev); + if (nvec < 0) + return nvec; + else if (nvec < minvec) + return -EINVAL; + else if (nvec > maxvec) + nvec = maxvec; + + do { + rc = pci_msi_check_device(dev, nvec, PCI_CAP_ID_MSI); + if (rc < 0) { + return rc; + } else if (rc > 0) { + if (rc < minvec) + return -ENOSPC; + nvec = rc; + } + } while (rc); + do { - rc = pci_enable_msi_block(dev, nvec); + rc = msi_capability_init(dev, nvec); if (rc < 0) { return rc; } else if (rc > 0) { |