linux-kernel - [PATCH v6 1/2] genirq/msi: add wrapper msi allocation API and export msi functions

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Date: Tue, 23 Apr 2024 16:40:20 +0530
From: Nipun Gupta <nipun.gupta@....com>
To: <alex.williamson@...hat.com>, <tglx@...utronix.de>,
	<gregkh@...uxfoundation.org>, <linux-kernel@...r.kernel.org>,
	<kvm@...r.kernel.org>
CC: <maz@...nel.org>, <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 v6 1/2] genirq/msi: add wrapper msi allocation API and export msi functions

SI functions 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 interrupts rather than range for simpler driver usage.

Signed-off-by: Nipun Gupta <nipun.gupta@....com>
Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
---

No change in v5->v6

Changes in v4->v5:
- updated commit description as per the comments.
- Rebased on 6.9-rc1

Changes in v3->v4:
- No change

Changes in v3: 
- New in this patch series. VFIO-CDX uses the new wrapper API 
  msi_domain_alloc_irqs and exported APIs. (This patch is moved
  from CDX interrupt support to vfio-cdx patch, where these APIs
  are used).

 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 84859a9aa091..dc27cf3903d5 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -674,6 +674,12 @@ 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