linux-kernel - [PATCH v8 2/2] add wrapper msi allocation API and export msi functions

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Message-ID: <20240223092447.65564-2-nipun.gupta@amd.com>
Date: Fri, 23 Feb 2024 14:54:47 +0530
From: Nipun Gupta <nipun.gupta@....com>
To: <gregkh@...uxfoundation.org>, <maz@...nel.org>, <tglx@...utronix.de>,
	<jgg@...pe.ca>, <linux-kernel@...r.kernel.org>
CC: <git@....com>, <harpreet.anand@....com>,
	<pieter.jansen-van-vuuren@....com>, <nikhil.agarwal@....com>,
	<michal.simek@....com>, <abhijit.gangurde@....com>, <srivatsa@...il.mit.edu>,
	Nipun Gupta <nipun.gupta@....com>
Subject: [PATCH v8 2/2] add wrapper msi allocation API and export msi functions

MSI functions can be for allocation and free can be directly
used by the device drivers without any wrapper provided by
bus drivers. So export these MSI functions.

Also, add a wrapper API to allocate MSIs providing only the
number of IRQ's rather than range for simpler driver usage.

Signed-off-by: Nipun Gupta <nipun.gupta@....com>
---
 include/linux/msi.h | 6 ++++++
 kernel/irq/msi.c    | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/include/linux/msi.h b/include/linux/msi.h
index 26d07e23052e..765a65581a66 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -676,6 +676,12 @@ int platform_device_msi_init_and_alloc_irqs(struct device *dev, unsigned int nve
 void platform_device_msi_free_irqs_all(struct device *dev);
 
 bool msi_device_has_isolated_msi(struct device *dev);
+
+static inline int msi_domain_alloc_irqs(struct device *dev, unsigned int domid, int nirqs)
+{
+	return msi_domain_alloc_irqs_range(dev, domid, 0, nirqs - 1);
+}
+
 #else /* CONFIG_GENERIC_MSI_IRQ */
 static inline bool msi_device_has_isolated_msi(struct device *dev)
 {
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index f90952ebc494..2024f89baea4 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -1434,6 +1434,7 @@ int msi_domain_alloc_irqs_range(struct device *dev, unsigned int domid,
 	msi_unlock_descs(dev);
 	return ret;
 }
+EXPORT_SYMBOL_GPL(msi_domain_alloc_irqs_range);
 
 /**
  * msi_domain_alloc_irqs_all_locked - Allocate all interrupts from a MSI interrupt domain
@@ -1680,6 +1681,7 @@ void msi_domain_free_irqs_range(struct device *dev, unsigned int domid,
 	msi_domain_free_irqs_range_locked(dev, domid, first, last);
 	msi_unlock_descs(dev);
 }
+EXPORT_SYMBOL_GPL(msi_domain_free_irqs_all);
 
 /**
  * msi_domain_free_irqs_all_locked - Free all interrupts from a MSI interrupt domain
-- 
2.34.1