linux-kernel - [PATCH] genirq/msi: Add the address and data that show MSI/MSIX

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Message-Id: <20250227162821.253020-1-18255117159@163.com>
Date: Fri, 28 Feb 2025 00:28:21 +0800
From: Hans Zhang <18255117159@....com>
To: tglx@...utronix.de
Cc: manivannan.sadhasivam@...aro.org,
	kw@...ux.com,
	kwilczynski@...nel.org,
	bhelgaas@...gle.com,
	cassel@...nel.org,
	linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Hans Zhang <18255117159@....com>
Subject: [PATCH] genirq/msi: Add the address and data that show MSI/MSIX

Add to view the addresses and data stored in the MSI capability or the
addresses and data stored in the MSIX vector table.

e.g.
root@...t:/sys/bus/pci/devices/<dev>/msi_irqs# ls
86  87  88  89
root@...t:/sys/bus/pci/devices/<dev>/msi_irqs# cat *
msix
 address_hi: 0x00000000
 address_lo: 0x0e060040
 msg_data: 0x00000000
msix
 address_hi: 0x00000000
 address_lo: 0x0e060040
 msg_data: 0x00000001
msix
 address_hi: 0x00000000
 address_lo: 0x0e060040
 msg_data: 0x00000002
msix
 address_hi: 0x00000000
 address_lo: 0x0e060040
 msg_data: 0x00000003

Signed-off-by: Hans Zhang <18255117159@....com>
---
 kernel/irq/msi.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index 396a067a8a56..a37a3e535fb8 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -503,8 +503,18 @@ static ssize_t msi_mode_show(struct device *dev, struct device_attribute *attr,
 {
 	/* MSI vs. MSIX is per device not per interrupt */
 	bool is_msix = dev_is_pci(dev) ? to_pci_dev(dev)->msix_enabled : false;
+	struct msi_desc *desc;
+	u32 irq;
+
+	if (kstrtoint(attr->attr.name, 10, &irq) < 0)
+		return 0;
 
-	return sysfs_emit(buf, "%s\n", is_msix ? "msix" : "msi");
+	desc = irq_get_msi_desc(irq);
+	return sysfs_emit(
+		buf,
+		"%s\n address_hi: 0x%08x\n address_lo: 0x%08x\n msg_data: 0x%08x\n",
+		is_msix ? "msix" : "msi", desc->msg.address_hi,
+		desc->msg.address_lo, desc->msg.data);
 }
 
 static void msi_sysfs_remove_desc(struct device *dev, struct msi_desc *desc)

base-commit: dd83757f6e686a2188997cb58b5975f744bb7786
-- 
2.25.1