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genirq/msi: Provide helpers to return Linux IRQ/dev_msi hw IRQ number 

commit 84ede51031d8df62a94b4014294e81ff25b502fb Intel-BKC.

Add new helpers to get the Linux IRQ number and device specific index
for given device-relative vector so that the drivers don't need to
allocate their own arrays to keep track of the vectors and hwirq for
the multi vector device MSI case.

Reviewed-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Megha Dey <megha.dey@intel.com>
Signed-off-by: Chen Zhuo <sagazchen@tencent.com>
Signed-off-by: Xinghui Li <korantli@tencent.com>
This commit is contained in:
Dave Jiang 2021-02-19 14:36:44 -07:00 committed by Jianping Liu
parent 928af4084c
commit 6d52dbbfd2
2 changed files with 50 additions and 0 deletions
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2
include/linux/msi.h
View File

@ -455,6 +455,8 @@ struct irq_domain *platform_msi_create_irq_domain(struct fwnode_handle *fwnode,
int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec,
irq_write_msi_msg_t write_msi_msg);
void platform_msi_domain_free_irqs(struct device *dev);
int dev_msi_irq_vector(struct device *dev, unsigned int nr);
int dev_msi_hwirq(struct device *dev, unsigned int nr);
/* When an MSI domain is used as an intermediate domain */
int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev,

48
kernel/irq/msi.c
View File

@ -718,4 +718,52 @@ struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain)
return (struct msi_domain_info *)domain->host_data;
}
/**
* get_dev_msi_entry - Get the nth device MSI entry
* @dev: device to operate on
* @nr: device-relative interrupt vector index (0-based).
*
* Return the nth dev_msi entry
*/
static struct msi_desc *get_dev_msi_entry(struct device *dev, unsigned int nr)
{
struct msi_desc *entry;
int i = 0;
for_each_msi_entry(entry, dev) {
if (i == nr)
return entry;
i++;
}
WARN_ON_ONCE(!entry);
return entry;
}
/**
* dev_msi_irq_vector - Get the Linux IRQ number of a device vector
* @dev: device to operate on
* @nr: device-relative interrupt vector index (0-based).
*
* Returns the Linux IRQ number of a device vector.
*/
int dev_msi_irq_vector(struct device *dev, unsigned int nr)
{
return get_dev_msi_entry(dev, nr)->irq;
}
EXPORT_SYMBOL_GPL(dev_msi_irq_vector);
/**
* dev_msi_hwirq - Get the device MSI hw IRQ number of a device vector
* @dev: device to operate on
* @nr: device-relative interrupt vector index (0-based).
*
* Return the dev_msi hw IRQ number of a device vector.
*/
int dev_msi_hwirq(struct device *dev, unsigned int nr)
{
return get_dev_msi_entry(dev, nr)->device_msi.hwirq;
}
EXPORT_SYMBOL_GPL(dev_msi_hwirq);
#endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */