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genirq/msi: Add MSI allocation helper and export MSI functions

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MSI 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@amd.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240423111021.1686144-1-nipun.gupta@amd.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Nipun Gupta 2024-04-23 16:40:20 +05:30 committed by Alex Williamson
parent 82b951e6fb
commit 06fe8fd680
2 changed files with 8 additions and 0 deletions
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6
include/linux/msi.h
View file

@ -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)
{

2
kernel/irq/msi.c
View file

@ -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