diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2021-12-11 01:19:20 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2021-12-17 00:16:40 +0300 |
| commit | 7a823443e9b4ed1ff4a3026d184f09d23fd6d9c9 (patch) | |
| tree | dcd2f1d55b5def2178f495208170863bb37e6877 /drivers/pci/msi | |
| parent | 173ffad79d177d9a91fbf3be6bf67ca81e0f765a (diff) | |
| download | linux-7a823443e9b4ed1ff4a3026d184f09d23fd6d9c9.tar.xz | |
PCI/MSI: Provide MSI_FLAG_MSIX_CONTIGUOUS
Provide a domain info flag which makes the core code check for a contiguous
MSI-X index on allocation. That's simpler than checking it at some other
domain callback in architecture code.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/20211210221814.662401116@linutronix.de
Diffstat (limited to 'drivers/pci/msi')
| -rw-r--r-- | drivers/pci/msi/irqdomain.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/pci/msi/irqdomain.c b/drivers/pci/msi/irqdomain.c index 422420276d6f..180b2a18dc19 100644 --- a/drivers/pci/msi/irqdomain.c +++ b/drivers/pci/msi/irqdomain.c @@ -89,9 +89,21 @@ static int pci_msi_domain_check_cap(struct irq_domain *domain, if (pci_msi_desc_is_multi_msi(desc) && !(info->flags & MSI_FLAG_MULTI_PCI_MSI)) return 1; - else if (desc->pci.msi_attrib.is_msix && !(info->flags & MSI_FLAG_PCI_MSIX)) - return -ENOTSUPP; + if (desc->pci.msi_attrib.is_msix) { + if (!(info->flags & MSI_FLAG_PCI_MSIX)) + return -ENOTSUPP; + + if (info->flags & MSI_FLAG_MSIX_CONTIGUOUS) { + unsigned int idx = 0; + + /* Check for gaps in the entry indices */ + for_each_msi_entry(desc, dev) { + if (desc->msi_index != idx++) + return -ENOTSUPP; + } + } + } return 0; } |