diff options
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/msi.c | 53 | ||||
| -rw-r--r-- | drivers/pci/msi.h | 11 |
2 files changed, 8 insertions, 56 deletions
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index 6d9de026e141..a32e75a4417e 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -29,8 +29,6 @@ static kmem_cache_t* msi_cachep; static int pci_msi_enable = 1; static int last_alloc_vector; static int nr_released_vectors; -static int nr_reserved_vectors = NR_HP_RESERVED_VECTORS; -static int nr_msix_devices; #ifndef CONFIG_X86_IO_APIC int vector_irq[NR_VECTORS] = { [0 ... NR_VECTORS - 1] = -1}; @@ -534,11 +532,6 @@ void pci_scan_msi_device(struct pci_dev *dev) { if (!dev) return; - - if (pci_find_capability(dev, PCI_CAP_ID_MSIX) > 0) - nr_msix_devices++; - else if (pci_find_capability(dev, PCI_CAP_ID_MSI) > 0) - nr_reserved_vectors++; } #ifdef CONFIG_PM @@ -869,13 +862,19 @@ static int msix_capability_init(struct pci_dev *dev, attach_msi_entry(entry, vector); } if (i != nvec) { + int avail = i - 1; i--; for (; i >= 0; i--) { vector = (entries + i)->vector; msi_free_vector(dev, vector, 0); (entries + i)->vector = 0; } - return -EBUSY; + /* If we had some success report the number of irqs + * we succeeded in setting up. + */ + if (avail <= 0) + avail = -EBUSY; + return avail; } /* Set MSI-X enabled bits */ enable_msi_mode(dev, pos, PCI_CAP_ID_MSIX); @@ -954,14 +953,6 @@ int pci_enable_msi(struct pci_dev* dev) return -EINVAL; } status = msi_capability_init(dev); - if (!status) { - if (!pos) - nr_reserved_vectors--; /* Only MSI capable */ - else if (nr_msix_devices > 0) - nr_msix_devices--; /* Both MSI and MSI-X capable, - but choose enabling MSI */ - } - return status; } @@ -1070,10 +1061,9 @@ static int msi_free_vector(struct pci_dev* dev, int vector, int reassign) **/ int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec) { - int status, pos, nr_entries, free_vectors; + int status, pos, nr_entries; int i, j, temp; u16 control; - unsigned long flags; if (!entries || pci_msi_supported(dev) < 0) return -EINVAL; @@ -1112,34 +1102,7 @@ int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec) dev->irq = temp; return -EINVAL; } - - spin_lock_irqsave(&msi_lock, flags); - /* - * msi_lock is provided to ensure that enough vectors resources are - * available before granting. - */ - free_vectors = pci_vector_resources(last_alloc_vector, - nr_released_vectors); - /* Ensure that each MSI/MSI-X device has one vector reserved by - default to avoid any MSI-X driver to take all available - resources */ - free_vectors -= nr_reserved_vectors; - /* Find the average of free vectors among MSI-X devices */ - if (nr_msix_devices > 0) - free_vectors /= nr_msix_devices; - spin_unlock_irqrestore(&msi_lock, flags); - - if (nvec > free_vectors) { - if (free_vectors > 0) - return free_vectors; - else - return -EBUSY; - } - status = msix_capability_init(dev, entries, nvec); - if (!status && nr_msix_devices > 0) - nr_msix_devices--; - return status; } diff --git a/drivers/pci/msi.h b/drivers/pci/msi.h index 3519eca50d8a..6793241f3884 100644 --- a/drivers/pci/msi.h +++ b/drivers/pci/msi.h @@ -8,19 +8,8 @@ #include <asm/msi.h> -/* - * Assume the maximum number of hot plug slots supported by the system is about - * ten. The worstcase is that each of these slots is hot-added with a device, - * which has two MSI/MSI-X capable functions. To avoid any MSI-X driver, which - * attempts to request all available vectors, NR_HP_RESERVED_VECTORS is defined - * as below to ensure at least one message is assigned to each detected MSI/ - * MSI-X device function. - */ -#define NR_HP_RESERVED_VECTORS 20 - extern int vector_irq[NR_VECTORS]; extern void (*interrupt[NR_IRQS])(void); -extern int pci_vector_resources(int last, int nr_released); /* * MSI-X Address Register |