linux-kernel - [patch V4 04/21] irqchip/irq-msi-lib: Prepare for PCI MSI/MSIX

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Date: Sun, 23 Jun 2024 17:18:38 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: linux-arm-kernel@...ts.infradead.org,
 linux-pci@...r.kernel.org,
 maz@...nel.org,
 tglx@...utronix.de,
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Subject: [patch V4 04/21] irqchip/irq-msi-lib: Prepare for PCI MSI/MSIX

From: Thomas Gleixner <tglx@...utronix.de>

Add the bus tokens for DOMAIN_BUS_PCI_DEVICE_MSI and
DOMAIN_BUS_PCI_DEVICE_MSIX to the common child init
function.

Provide the match mask which can be used by parent domain
implementation so the bitmask based child bus token match
works.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@...utronix.de>
Signed-off-by: Shivamurthy Shastri <shivamurthy.shastri@...utronix.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>


---
v3: removed pci_device_msi_mask_unmask_parent_enable call as there is no
more global static key.
---
 drivers/irqchip/irq-msi-lib.c | 6 ++++++
 drivers/irqchip/irq-msi-lib.h | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/irqchip/irq-msi-lib.c b/drivers/irqchip/irq-msi-lib.c
index acbccf8f7f5b..0b359c5d8c6c 100644
--- a/drivers/irqchip/irq-msi-lib.c
+++ b/drivers/irqchip/irq-msi-lib.c
@@ -48,6 +48,12 @@ bool msi_lib_init_dev_msi_info(struct device *dev, struct irq_domain *domain,
 
 	/* Is the target domain bus token supported? */
 	switch(info->bus_token) {
+	case DOMAIN_BUS_PCI_DEVICE_MSI:
+	case DOMAIN_BUS_PCI_DEVICE_MSIX:
+		if (WARN_ON_ONCE(!IS_ENABLED(CONFIG_PCI_MSI)))
+			return false;
+
+		break;
 	default:
 		/*
 		 * This should never be reached. See
diff --git a/drivers/irqchip/irq-msi-lib.h b/drivers/irqchip/irq-msi-lib.h
index f0706cc28264..525aa5284a99 100644
--- a/drivers/irqchip/irq-msi-lib.h
+++ b/drivers/irqchip/irq-msi-lib.h
@@ -9,6 +9,12 @@
 #include <linux/irqdomain.h>
 #include <linux/msi.h>
 
+#ifdef CONFIG_PCI_MSI
+#define MATCH_PCI_MSI		BIT(DOMAIN_BUS_PCI_MSI)
+#else
+#define MATCH_PCI_MSI		(0)
+#endif
+
 int msi_lib_irq_domain_select(struct irq_domain *d, struct irq_fwspec *fwspec,
 			      enum irq_domain_bus_token bus_token);
 
-- 
2.34.1