linux-kernel - [tip: irq/msi] genirq/msi: Use PCI device property

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Date:   Thu, 16 Dec 2021 21:41:13 -0000
From:   "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Michael Kelley <mikelley@...rosoft.com>,
        Nishanth Menon <nm@...com>, Jason Gunthorpe <jgg@...dia.com>,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: irq/msi] genirq/msi: Use PCI device property

The following commit has been merged into the irq/msi branch of tip:

Commit-ID:     6ef7f771de0182141ef1a0863f27b12963e1d184
Gitweb:        https://git.kernel.org/tip/6ef7f771de0182141ef1a0863f27b12963e1d184
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Fri, 10 Dec 2021 23:18:49 +01:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Thu, 16 Dec 2021 22:16:37 +01:00

genirq/msi: Use PCI device property

to determine whether this is MSI or MSIX instead of consulting MSI
descriptors.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Tested-by: Michael Kelley <mikelley@...rosoft.com>
Tested-by: Nishanth Menon <nm@...com>
Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
Link: https://lore.kernel.org/r/20211210221813.434156196@linutronix.de

---
 kernel/irq/msi.c | 17 ++---------------
 1 file changed, 2 insertions(+), 15 deletions(-)

diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index 4a7a7f0..b3f73ef 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -77,21 +77,8 @@ EXPORT_SYMBOL_GPL(get_cached_msi_msg);
 static ssize_t msi_mode_show(struct device *dev, struct device_attribute *attr,
 			     char *buf)
 {
-	struct msi_desc *entry;
-	bool is_msix = false;
-	unsigned long irq;
-	int retval;
-
-	retval = kstrtoul(attr->attr.name, 10, &irq);
-	if (retval)
-		return retval;
-
-	entry = irq_get_msi_desc(irq);
-	if (!entry)
-		return -ENODEV;
-
-	if (dev_is_pci(dev))
-		is_msix = entry->pci.msi_attrib.is_msix;
+	/* MSI vs. MSIX is per device not per interrupt */
+	bool is_msix = dev_is_pci(dev) ? to_pci_dev(dev)->msix_enabled : false;
 
 	return sysfs_emit(buf, "%s\n", is_msix ? "msix" : "msi");
 }