linux-kernel - [patch 27/39] PCI/MSI: Move pci_disable

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20221111122015.156785224@linutronix.de>
Date:   Fri, 11 Nov 2022 14:54:58 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>, linux-pci@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Marc Zyngier <maz@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Ashok Raj <ashok.raj@...el.com>, Jon Mason <jdmason@...zu.us>,
        Allen Hubbe <allenbh@...il.com>,
        "Ahmed S. Darwish" <darwi@...utronix.de>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        linuxppc-dev@...ts.ozlabs.org
Subject: [patch 27/39] PCI/MSI: Move pci_disable_msix() to api.c

From: Ahmed S. Darwish <darwi@...utronix.de>

To distangle the maze in msi.c, all exported device-driver MSI APIs are
now to be grouped in one file, api.c.

Move pci_disable_msix() and make its kernel-doc comprehensive.

Signed-off-by: Ahmed S. Darwish <darwi@...utronix.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 drivers/pci/msi/api.c | 24 ++++++++++++++++++++++++
 drivers/pci/msi/msi.c | 14 +-------------
 drivers/pci/msi/msi.h |  1 +
 3 files changed, 26 insertions(+), 13 deletions(-)
---
diff --git a/drivers/pci/msi/api.c b/drivers/pci/msi/api.c
index 83ea38ffa116..653a61868ae6 100644
--- a/drivers/pci/msi/api.c
+++ b/drivers/pci/msi/api.c
@@ -112,6 +112,30 @@ int pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries,
 EXPORT_SYMBOL(pci_enable_msix_range);
 
 /**
+ * pci_disable_msix() - Disable MSI-X interrupt mode on device
+ * @dev: the PCI device to operate on
+ *
+ * Legacy device driver API to disable MSI-X interrupt mode on device,
+ * free earlier-allocated interrupt vectors, and restore INTx emulation.
+ * The PCI device Linux IRQ (@dev->irq) is restored to its default pin
+ * assertion IRQ. This is the cleanup pair of pci_enable_msix_range().
+ *
+ * NOTE: The newer pci_alloc_irq_vectors() / pci_free_irq_vectors() API
+ * pair should, in general, be used instead.
+ */
+void pci_disable_msix(struct pci_dev *dev)
+{
+	if (!pci_msi_enabled() || !dev || !dev->msix_enabled)
+		return;
+
+	msi_lock_descs(&dev->dev);
+	pci_msix_shutdown(dev);
+	pci_free_msi_irqs(dev);
+	msi_unlock_descs(&dev->dev);
+}
+EXPORT_SYMBOL(pci_disable_msix);
+
+/**
  * pci_alloc_irq_vectors() - Allocate multiple device interrupt vectors
  * @dev:      the PCI device to operate on
  * @min_vecs: minimum required number of vectors (must be >= 1)
diff --git a/drivers/pci/msi/msi.c b/drivers/pci/msi/msi.c
index 1226d66da992..6fa90d07d2e4 100644
--- a/drivers/pci/msi/msi.c
+++ b/drivers/pci/msi/msi.c
@@ -736,7 +736,7 @@ static int __pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries,
 	return msix_capability_init(dev, entries, nvec, affd);
 }
 
-static void pci_msix_shutdown(struct pci_dev *dev)
+void pci_msix_shutdown(struct pci_dev *dev)
 {
 	struct msi_desc *desc;
 
@@ -758,18 +758,6 @@ static void pci_msix_shutdown(struct pci_dev *dev)
 	pcibios_alloc_irq(dev);
 }
 
-void pci_disable_msix(struct pci_dev *dev)
-{
-	if (!pci_msi_enable || !dev || !dev->msix_enabled)
-		return;
-
-	msi_lock_descs(&dev->dev);
-	pci_msix_shutdown(dev);
-	pci_free_msi_irqs(dev);
-	msi_unlock_descs(&dev->dev);
-}
-EXPORT_SYMBOL(pci_disable_msix);
-
 int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
 			   struct irq_affinity *affd)
 {
diff --git a/drivers/pci/msi/msi.h b/drivers/pci/msi/msi.h
index 8c4a5289432d..77e2587f7e4f 100644
--- a/drivers/pci/msi/msi.h
+++ b/drivers/pci/msi/msi.h
@@ -86,6 +86,7 @@ static inline __attribute_const__ u32 msi_multi_mask(struct msi_desc *desc)
 
 /* MSI internal functions invoked from the public APIs */
 void pci_msi_shutdown(struct pci_dev *dev);
+void pci_msix_shutdown(struct pci_dev *dev);
 void pci_free_msi_irqs(struct pci_dev *dev);
 int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec, struct irq_affinity *affd);
 int __pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries, int minvec,