linux-kernel - [patch 07/10] PCI/MSI: Make free related functions range based

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Date:   Sat, 27 Nov 2021 02:25:08 +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>,
        Michael Ellerman <mpe@...erman.id.au>,
        Andrew Cooper <amc96@....ac.uk>,
        Juergen Gross <jgross@...e.com>, linux-pci@...r.kernel.org,
        xen-devel@...ts.xenproject.org
Subject: [patch 07/10] PCI/MSI: Make free related functions range based

In preparation of runtime expandable PCI/MSI-X vectors convert the related
free functions to take ranges instead of assuming a zero based vector
space.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 drivers/pci/msi/irqdomain.c |    5 ++---
 drivers/pci/msi/msi.c       |   24 ++++++++++++++++--------
 drivers/pci/msi/msi.h       |    2 +-
 3 files changed, 19 insertions(+), 12 deletions(-)

--- a/drivers/pci/msi/irqdomain.c
+++ b/drivers/pci/msi/irqdomain.c
@@ -19,14 +19,13 @@ int pci_msi_setup_msi_irqs(struct pci_de
 	return pci_msi_legacy_setup_msi_irqs(dev, range->ndesc, type);
 }
 
-void pci_msi_teardown_msi_irqs(struct pci_dev *dev)
+void pci_msi_teardown_msi_irqs(struct pci_dev *dev, struct msi_range *range)
 {
-	struct msi_range range = { .first = 0, .last = UINT_MAX, };
 	struct irq_domain *domain;
 
 	domain = dev_get_msi_domain(&dev->dev);
 	if (domain && irq_domain_is_hierarchy(domain))
-		msi_domain_free_irqs_descs_locked(domain, &dev->dev, &range);
+		msi_domain_free_irqs_descs_locked(domain, &dev->dev, range);
 	else
 		pci_msi_legacy_teardown_msi_irqs(dev);
 }
--- a/drivers/pci/msi/msi.c
+++ b/drivers/pci/msi/msi.c
@@ -222,9 +222,12 @@ void pci_write_msi_msg(unsigned int irq,
 }
 EXPORT_SYMBOL_GPL(pci_write_msi_msg);
 
-static void free_msi_irqs(struct pci_dev *dev)
+static void free_msi_irqs(struct pci_dev *dev, struct msi_range *range, bool shutdown)
 {
-	pci_msi_teardown_msi_irqs(dev);
+	pci_msi_teardown_msi_irqs(dev, range);
+
+	if (!shutdown)
+		return;
 
 	if (dev->msix_base) {
 		iounmap(dev->msix_base);
@@ -443,7 +446,7 @@ static int msi_capability_init(struct pc
 
 err:
 	pci_msi_unmask(entry, msi_multi_mask(entry));
-	free_msi_irqs(dev);
+	free_msi_irqs(dev, &range, true);
 unlock:
 	msi_unlock_descs(&dev->dev);
 	kfree(masks);
@@ -538,7 +541,7 @@ static void msix_mask_all(void __iomem *
 
 static int msix_setup_interrupts(struct pci_dev *dev, void __iomem *base,
 				 struct msi_range *range, struct msix_entry *entries,
-				 struct irq_affinity *affd)
+				 struct irq_affinity *affd, bool expand)
 {
 	struct irq_affinity_desc *masks = NULL;
 	int ret;
@@ -566,7 +569,8 @@ static int msix_setup_interrupts(struct
 	goto out_unlock;
 
 out_free:
-	free_msi_irqs(dev);
+	free_msi_irqs(dev, range, !expand);
+
 out_unlock:
 	msi_unlock_descs(&dev->dev);
 	kfree(masks);
@@ -614,7 +618,7 @@ static int msix_capability_init(struct p
 	/* Ensure that all table entries are masked. */
 	msix_mask_all(base, tsize);
 
-	ret = msix_setup_interrupts(dev, base, &range, entries, affd);
+	ret = msix_setup_interrupts(dev, base, &range, entries, affd, false);
 	if (ret)
 		goto out_disable;
 
@@ -728,12 +732,14 @@ static void pci_msi_shutdown(struct pci_
 
 void pci_disable_msi(struct pci_dev *dev)
 {
+	struct msi_range range = { .first = 0, .last = 0, };
+
 	if (!pci_msi_enable || !dev || !dev->msi_enabled)
 		return;
 
 	msi_lock_descs(&dev->dev);
 	pci_msi_shutdown(dev);
-	free_msi_irqs(dev);
+	free_msi_irqs(dev, &range, true);
 	msi_unlock_descs(&dev->dev);
 }
 EXPORT_SYMBOL(pci_disable_msi);
@@ -817,12 +823,14 @@ static void pci_msix_shutdown(struct pci
 
 void pci_disable_msix(struct pci_dev *dev)
 {
+	struct msi_range range = { .first = 0, .last = UINT_MAX, };
+
 	if (!pci_msi_enable || !dev || !dev->msix_enabled)
 		return;
 
 	msi_lock_descs(&dev->dev);
 	pci_msix_shutdown(dev);
-	free_msi_irqs(dev);
+	free_msi_irqs(dev, &range, true);
 	msi_unlock_descs(&dev->dev);
 }
 EXPORT_SYMBOL(pci_disable_msix);
--- a/drivers/pci/msi/msi.h
+++ b/drivers/pci/msi/msi.h
@@ -6,7 +6,7 @@
 #define msix_table_size(flags)	((flags & PCI_MSIX_FLAGS_QSIZE) + 1)
 
 extern int pci_msi_setup_msi_irqs(struct pci_dev *dev, struct msi_range *range, int type);
-extern void pci_msi_teardown_msi_irqs(struct pci_dev *dev);
+extern void pci_msi_teardown_msi_irqs(struct pci_dev *dev, struct msi_range *range);
 
 #ifdef CONFIG_PCI_MSI_ARCH_FALLBACKS
 extern int pci_msi_legacy_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);