linux-kernel - [patch V2 03/36] PCI/MSI: Allocate MSI device data on first use

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Date:   Mon,  6 Dec 2021 23:39:00 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Bjorn Helgaas <helgaas@...nel.org>, Marc Zygnier <maz@...nel.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Megha Dey <megha.dey@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, linux-pci@...r.kernel.org,
        Cedric Le Goater <clg@...d.org>,
        xen-devel@...ts.xenproject.org, Juergen Gross <jgross@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Will Deacon <will@...nel.org>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        iommu@...ts.linux-foundation.org, dmaengine@...r.kernel.org,
        Stuart Yoder <stuyoder@...il.com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Nishanth Menon <nm@...com>, Tero Kristo <kristo@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Vinod Koul <vkoul@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Robin Murphy <robin.murphy@....com>,
        Sinan Kaya <okaya@...nel.org>
Subject: [patch V2 03/36] PCI/MSI: Allocate MSI device data on first use

Allocate MSI device data on first use, i.e. when a PCI driver invokes one
of the PCI/MSI enablement functions.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
---
 drivers/pci/msi/msi.c |   20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

--- a/drivers/pci/msi/msi.c
+++ b/drivers/pci/msi/msi.c
@@ -889,10 +889,12 @@ static int __pci_enable_msi_range(struct
 /* deprecated, don't use */
 int pci_enable_msi(struct pci_dev *dev)
 {
-	int rc = __pci_enable_msi_range(dev, 1, 1, NULL);
-	if (rc < 0)
-		return rc;
-	return 0;
+	int rc = msi_setup_device_data(&dev->dev);
+
+	if (!rc)
+		rc = __pci_enable_msi_range(dev, 1, 1, NULL);
+
+	return rc < 0 ? rc : 0;
 }
 EXPORT_SYMBOL(pci_enable_msi);
 
@@ -947,7 +949,11 @@ static int __pci_enable_msix_range(struc
 int pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries,
 		int minvec, int maxvec)
 {
-	return __pci_enable_msix_range(dev, entries, minvec, maxvec, NULL, 0);
+	int ret = msi_setup_device_data(&dev->dev);
+
+	if (!ret)
+		ret = __pci_enable_msix_range(dev, entries, minvec, maxvec, NULL, 0);
+	return ret;
 }
 EXPORT_SYMBOL(pci_enable_msix_range);
 
@@ -974,8 +980,12 @@ int pci_alloc_irq_vectors_affinity(struc
 				   struct irq_affinity *affd)
 {
 	struct irq_affinity msi_default_affd = {0};
+	int ret = msi_setup_device_data(&dev->dev);
 	int nvecs = -ENOSPC;
 
+	if (ret)
+		return ret;
+
 	if (flags & PCI_IRQ_AFFINITY) {
 		if (!affd)
 			affd = &msi_default_affd;