linux-kernel - [patch 17/22] PCI/MSI: Split out !IRQDOMAIN code

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Date:   Sat, 27 Nov 2021 02:19:47 +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,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        linuxppc-dev@...ts.ozlabs.org,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-mips@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        sparclinux@...r.kernel.org, x86@...nel.org,
        xen-devel@...ts.xenproject.org, ath11k@...ts.infradead.org,
        Wei Liu <wei.liu@...nel.org>, linux-hyperv@...r.kernel.org,
        Juergen Gross <jgross@...e.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>
Subject: [patch 17/22] PCI/MSI: Split out !IRQDOMAIN code

Split out the non irqdomain code into its own file.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 drivers/pci/msi/Makefile |    5 ++--
 drivers/pci/msi/legacy.c |   51 +++++++++++++++++++++++++++++++++++++++++++++++
 drivers/pci/msi/msi.c    |   46 ------------------------------------------
 3 files changed, 54 insertions(+), 48 deletions(-)

--- a/drivers/pci/msi/Makefile
+++ b/drivers/pci/msi/Makefile
@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0
 #
 # Makefile for the PCI/MSI
-obj-$(CONFIG_PCI)		+= pcidev_msi.o
-obj-$(CONFIG_PCI_MSI)		+= msi.o
+obj-$(CONFIG_PCI)			+= pcidev_msi.o
+obj-$(CONFIG_PCI_MSI)			+= msi.o
+obj-$(CONFIG_PCI_MSI_ARCH_FALLBACKS)	+= legacy.o
--- /dev/null
+++ b/drivers/pci/msi/legacy.c
@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCI Message Signaled Interrupt (MSI).
+ *
+ * Legacy architecture specific setup and teardown mechanism.
+ */
+#include "msi.h"
+
+/* Arch hooks */
+int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
+{
+	return -EINVAL;
+}
+
+void __weak arch_teardown_msi_irq(unsigned int irq)
+{
+}
+
+int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
+{
+	struct msi_desc *desc;
+	int ret;
+
+	/*
+	 * If an architecture wants to support multiple MSI, it needs to
+	 * override arch_setup_msi_irqs()
+	 */
+	if (type == PCI_CAP_ID_MSI && nvec > 1)
+		return 1;
+
+	for_each_pci_msi_entry(desc, dev) {
+		ret = arch_setup_msi_irq(dev, desc);
+		if (ret)
+			return ret < 0 ? ret : -ENOSPC;
+	}
+
+	return 0;
+}
+
+void __weak arch_teardown_msi_irqs(struct pci_dev *dev)
+{
+	struct msi_desc *desc;
+	int i;
+
+	for_each_pci_msi_entry(desc, dev) {
+		if (desc->irq) {
+			for (i = 0; i < entry->nvec_used; i++)
+				arch_teardown_msi_irq(desc->irq + i);
+		}
+	}
+}
--- a/drivers/pci/msi/msi.c
+++ b/drivers/pci/msi/msi.c
@@ -50,52 +50,6 @@ static void pci_msi_teardown_msi_irqs(st
 #define pci_msi_teardown_msi_irqs	arch_teardown_msi_irqs
 #endif
 
-#ifdef CONFIG_PCI_MSI_ARCH_FALLBACKS
-/* Arch hooks */
-int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
-{
-	return -EINVAL;
-}
-
-void __weak arch_teardown_msi_irq(unsigned int irq)
-{
-}
-
-int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
-{
-	struct msi_desc *entry;
-	int ret;
-
-	/*
-	 * If an architecture wants to support multiple MSI, it needs to
-	 * override arch_setup_msi_irqs()
-	 */
-	if (type == PCI_CAP_ID_MSI && nvec > 1)
-		return 1;
-
-	for_each_pci_msi_entry(entry, dev) {
-		ret = arch_setup_msi_irq(dev, entry);
-		if (ret < 0)
-			return ret;
-		if (ret > 0)
-			return -ENOSPC;
-	}
-
-	return 0;
-}
-
-void __weak arch_teardown_msi_irqs(struct pci_dev *dev)
-{
-	int i;
-	struct msi_desc *entry;
-
-	for_each_pci_msi_entry(entry, dev)
-		if (entry->irq)
-			for (i = 0; i < entry->nvec_used; i++)
-				arch_teardown_msi_irq(entry->irq + i);
-}
-#endif /* CONFIG_PCI_MSI_ARCH_FALLBACKS */
-
 /*
  * PCI 2.3 does not specify mask bits for each MSI interrupt.  Attempting to
  * mask all MSI interrupts by clearing the MSI enable bit does not work