diff options
Diffstat (limited to '')
-rw-r--r-- | drivers/pci/msi/msi.h | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/pci/msi/msi.h b/drivers/pci/msi/msi.h new file mode 100644 index 000000000..dbeff066b --- /dev/null +++ b/drivers/pci/msi/msi.h @@ -0,0 +1,39 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#include <linux/pci.h> +#include <linux/msi.h> + +#define msix_table_size(flags) ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) + +extern int pci_msi_setup_msi_irqs(struct pci_dev *dev, int nvec, int type); +extern void pci_msi_teardown_msi_irqs(struct pci_dev *dev); + +#ifdef CONFIG_PCI_MSI_ARCH_FALLBACKS +extern int pci_msi_legacy_setup_msi_irqs(struct pci_dev *dev, int nvec, int type); +extern void pci_msi_legacy_teardown_msi_irqs(struct pci_dev *dev); +#else +static inline int pci_msi_legacy_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) +{ + WARN_ON_ONCE(1); + return -ENODEV; +} + +static inline void pci_msi_legacy_teardown_msi_irqs(struct pci_dev *dev) +{ + WARN_ON_ONCE(1); +} +#endif + +/* + * PCI 2.3 does not specify mask bits for each MSI interrupt. Attempting to + * mask all MSI interrupts by clearing the MSI enable bit does not work + * reliably as devices without an INTx disable bit will then generate a + * level IRQ which will never be cleared. + */ +static inline __attribute_const__ u32 msi_multi_mask(struct msi_desc *desc) +{ + /* Don't shift by >= width of type */ + if (desc->pci.msi_attrib.multi_cap >= 5) + return 0xffffffff; + return (1 << (1 << desc->pci.msi_attrib.multi_cap)) - 1; +} |