On Wed, Nov 16, 2022 at 06:02:30PM +0100, Thomas Gleixner wrote: > On Wed, Nov 16 2022 at 07:52, Ashok Raj wrote: > > On Fri, Nov 11, 2022 at 02:54:17PM +0100, Thomas Gleixner wrote: > >> PCI/Multi-MSI is MSI specific and not supported for MSI-X. > >> > >> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> > >> --- > >> drivers/iommu/intel/irq_remapping.c | 3 +-- > >> 1 file changed, 1 insertion(+), 2 deletions(-) > >> > >> --- a/drivers/iommu/intel/irq_remapping.c > >> +++ b/drivers/iommu/intel/irq_remapping.c > >> @@ -1334,8 +1334,7 @@ static int intel_irq_remapping_alloc(str > >> > >> if (!info || !iommu) > >> return -EINVAL; > >> - if (nr_irqs > 1 && info->type != X86_IRQ_ALLOC_TYPE_PCI_MSI && > >> - info->type != X86_IRQ_ALLOC_TYPE_PCI_MSIX) > >> + if (nr_irqs > 1 && info->type != X86_IRQ_ALLOC_TYPE_PCI_MSI) > >> return -EINVAL; > >> > >> /* > >> > > > > This check is only making sure that when multi-msi is requested that the > > type has to be either MSI/MSIX. > > MSI-X does not support multi vector allocations on a single entry. > > > Wouldn't this change return -EINVAL when type = MSIX? > > Rightfully so. MSIX vectors are allocated one by one. Has been that way > forever. > I thought why block multi-vector allocation on MSIX, but if there is no use case makes perfect sense. Thanks for the clarification. Reviewed-by: Ashok Raj <ashok.raj@xxxxxxxxx>
