irq_remapping_cap() was introduced to detect whether irq remapping
supports new features, such as VT-d Posted-Interrupts", according to
commit 959c870f7305 ("iommu, x86: Provide irq_remapping_cap() interface").The VT-d Posted-Interrupts support can be disabled by the command line parameter "intremap=nopost". So, it's better to use irq_remapping_cap() to check if the VT-d Posted-Interrupts is enabled before any Posted Interrupt Descriptor info dump. Cc: Lu Baolu <[email protected]> Cc: Joerg Roedel <[email protected]> Cc: Sohil Mehta <[email protected]> Cc: Jacob Pan <[email protected]> Reported-by: Yi Sun <[email protected]> Signed-off-by: Tina Zhang <[email protected]> --- drivers/iommu/intel/debugfs.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/intel/debugfs.c b/drivers/iommu/intel/debugfs.c index efea7f02abd9..87a4a76866f4 100644 --- a/drivers/iommu/intel/debugfs.c +++ b/drivers/iommu/intel/debugfs.c @@ -516,7 +516,8 @@ static int ir_translation_struct_show(struct seq_file *m, void *unused) seq_puts(m, "****\n\n"); for_each_active_iommu(iommu, drhd) { - if (!cap_pi_support(iommu->cap)) + if (!irq_remapping_cap(IRQ_POSTING_CAP) || + !cap_pi_support(iommu->cap)) continue; seq_printf(m, "Posted Interrupt supported on IOMMU: %s\n", -- 2.25.1 _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
