[PATCH v4 07/28] x86, irq: Show MSI-X in /proc/interrupt

[Yinghai Lu <yinghai@kernel.org>]

Now MSI-X is shown as MSI in /proc/interrupt.

We could use new added irq_print_chip() interface to append -X for MSI-X.

After this patch, we will have PCI-MSI-X-edge IR-PCI-MSI-X-edge for MSI-X
instead of PCI-MSI-edge IR-PCI-MSI-edge in the /proc/interrupt.

-v2: do not need to check if msi_desc is null in msi_irq_print_chip().

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
---
 arch/x86/kernel/apic/io_apic.c | 7 +++++++
 drivers/iommu/irq_remapping.c  | 5 ++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 119fdf8..cf320fb 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -3087,6 +3087,12 @@ msi_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force)
 	return IRQ_SET_MASK_OK_NOCOPY;
 }
 
+static void msi_irq_print_chip(struct irq_data *data, struct seq_file *p)
+{
+	seq_printf(p, " %s%s", data->chip->name,
+			data->msi_desc->msi_attrib.is_msix ? "-X" : "");
+}
+
 /*
  * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
  * which implement the MSI or MSI-X Capability Structure.
@@ -3098,6 +3104,7 @@ struct irq_chip msi_chip = {
 	.irq_ack		= ack_apic_edge,
 	.irq_set_affinity	= msi_set_affinity,
 	.irq_retrigger		= ioapic_retrigger_irq,
+	.irq_print_chip		= msi_irq_print_chip,
 };
 
 int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc,
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index 8e4e3af..6893d75 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -372,7 +372,10 @@ static void ir_ack_apic_level(struct irq_data *data)
 
 static void ir_print_prefix(struct irq_data *data, struct seq_file *p)
 {
-	seq_printf(p, " IR-%s", data->chip->name);
+	seq_printf(p, " IR-%s%s", data->chip->name,
+			data->msi_desc ?
+			 (data->msi_desc->msi_attrib.is_msix ? "-X" : "")
+			 : "");
 }
 
 static void __init irq_remap_modify_chip_defaults(struct irq_chip *chip)
-- 
1.8.1.4