From b43d451385ef833e0696032aac2629da04d46c59 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Sat, 24 Jan 2009 00:23:22 +0100 Subject: PCI/PCIe portdrv: Fix allocation of interrupts If MSI-X interrupt mode is used by the PCI Express port driver, too many vectors are allocated and it is not ensured that the right vectors will be used for the right services. Namely, the PCI Express specification states that both PCI Express native PME and PCI Express hotplug will always use the same MSI or MSI-X message for signalling interrupts, which implies that the same vector will be used by both of them. Also, the VC service does not use interrupts at all. Moreover, is not clear which of the vectors allocated by pci_enable_msix() in the current code will be used for PME and hotplug and which of them will be used for AER if all of these services are configured. For these reasons, rework the allocation of interrupts for PCI Express ports so that if MSI-X are enabled, the right vectors will be used for the right purposes. Signed-off-by: Rafael J. Wysocki Reviewed-by: Hidetoshi Seto Signed-off-by: Jesse Barnes --- drivers/pci/pcie/portdrv.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'drivers/pci/pcie/portdrv.h') diff --git a/drivers/pci/pcie/portdrv.h b/drivers/pci/pcie/portdrv.h index ad4d082a0344..5b818bd835ef 100644 --- a/drivers/pci/pcie/portdrv.h +++ b/drivers/pci/pcie/portdrv.h @@ -25,6 +25,12 @@ #define PCIE_CAPABILITIES_REG 0x2 #define PCIE_SLOT_CAPABILITIES_REG 0x14 #define PCIE_PORT_DEVICE_MAXSERVICES 4 +#define PCIE_PORT_MSI_VECTOR_MASK 0x1f +/* + * According to the PCI Express Base Specification 2.0, the indices of the MSI-X + * table entires used by port services must not exceed 31 + */ +#define PCIE_PORT_MAX_MSIX_ENTRIES 32 #define get_descriptor_id(type, service) (((type - 4) << 4) | service) -- cgit v1.2.3