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authorThomas Gleixner <tglx@linutronix.de>2021-12-11 01:19:20 +0300
committerThomas Gleixner <tglx@linutronix.de>2021-12-17 00:16:40 +0300
commit7a823443e9b4ed1ff4a3026d184f09d23fd6d9c9 (patch)
treedcd2f1d55b5def2178f495208170863bb37e6877 /drivers/pci/msi
parent173ffad79d177d9a91fbf3be6bf67ca81e0f765a (diff)
downloadlinux-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.c16
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;
}