Line data    Source code

       1             : /* SPDX-License-Identifier: GPL-2.0 */
       2             : 
       3             : #include <linux/pci.h>
       4             : #include <linux/msi.h>
       5             : 
       6             : #define msix_table_size(flags)  ((flags & PCI_MSIX_FLAGS_QSIZE) + 1)
       7             : 
       8             : extern int pci_msi_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
       9             : extern void pci_msi_teardown_msi_irqs(struct pci_dev *dev);
      10             : 
      11             : #ifdef CONFIG_PCI_MSI_ARCH_FALLBACKS
      12             : extern int pci_msi_legacy_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
      13             : extern void pci_msi_legacy_teardown_msi_irqs(struct pci_dev *dev);
      14             : #else
      15           0 : static inline int pci_msi_legacy_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
      16             : {
      17           0 :         WARN_ON_ONCE(1);
      18           0 :         return -ENODEV;
      19             : }
      20             : 
      21           0 : static inline void pci_msi_legacy_teardown_msi_irqs(struct pci_dev *dev)
      22             : {
      23           0 :         WARN_ON_ONCE(1);
      24           0 : }
      25             : #endif
      26             : 
      27             : /*
      28             :  * PCI 2.3 does not specify mask bits for each MSI interrupt.  Attempting to
      29             :  * mask all MSI interrupts by clearing the MSI enable bit does not work
      30             :  * reliably as devices without an INTx disable bit will then generate a
      31             :  * level IRQ which will never be cleared.
      32             :  */
      33             : static inline __attribute_const__ u32 msi_multi_mask(struct msi_desc *desc)
      34             : {
      35             :         /* Don't shift by >= width of type */
      36           0 :         if (desc->pci.msi_attrib.multi_cap >= 5)
      37             :                 return 0xffffffff;
      38           0 :         return (1 << (1 << desc->pci.msi_attrib.multi_cap)) - 1;
      39             : }