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genirq: Introduce msi_domain_alloc/free_irqs()

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Introduce msi_domain_{alloc|free}_irqs() to alloc/free interrupts
from generic MSI irqdomain.

Signed-off-by: Jiang Liu <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: [email protected]
Cc: Bjorn Helgaas <[email protected]>
Cc: Grant Likely <[email protected]>
Cc: Marc Zyngier <[email protected]>
Cc: Yijing Wang <[email protected]>
Cc: Yingjoe Chen <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Matthias Brugger <[email protected]>
Cc: Alexander Gordeev <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Jiang Liu 2014-11-15 22:24:04 +08:00 • committed by Thomas Gleixner
commit d9109698be
2 changed files with 104 additions and 0 deletions
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75
kernel/irq/msi.c
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@ -13,6 +13,9 @@
#include <linux/irqdomain.h>
#include <linux/msi.h>
/* Temparory solution for building, will be removed later */
#include <linux/pci.h>
#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
/**
* msi_domain_set_affinity - Generic affinity setter function for MSI domains
@ -126,6 +129,78 @@ struct irq_domain *msi_create_irq_domain(struct device_node *of_node,
return domain;
}
/**
* msi_domain_alloc_irqs - Allocate interrupts from a MSI interrupt domain
* @domain: The domain to allocate from
* @dev: Pointer to device struct of the device for which the interrupts
* are allocated
* @nvec: The number of interrupts to allocate
*
* Returns 0 on success or an error code.
*/
int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
int nvec)
{
struct msi_domain_info *info = domain->host_data;
struct msi_domain_ops *ops = info->ops;
msi_alloc_info_t arg;
struct msi_desc *desc;
int i, ret, virq = -1;
ret = ops->msi_check(domain, info, dev);
if (ret == 0)
ret = ops->msi_prepare(domain, dev, nvec, &arg);
if (ret)
return ret;
for_each_msi_entry(desc, dev) {
ops->set_desc(&arg, desc);
virq = __irq_domain_alloc_irqs(domain, -1, desc->nvec_used,
dev_to_node(dev), &arg, false);
if (virq < 0) {
ret = -ENOSPC;
if (ops->handle_error)
ret = ops->handle_error(domain, desc, ret);
if (ops->msi_finish)
ops->msi_finish(&arg, ret);
return ret;
}
for (i = 0; i < desc->nvec_used; i++)
irq_set_msi_desc_off(virq, i, desc);
}
if (ops->msi_finish)
ops->msi_finish(&arg, 0);
for_each_msi_entry(desc, dev) {
if (desc->nvec_used == 1)
dev_dbg(dev, "irq %d for MSI\n", virq);
else
dev_dbg(dev, "irq [%d-%d] for MSI\n",
virq, virq + desc->nvec_used - 1);
}
return 0;
}
/**
* msi_domain_free_irqs - Free interrupts from a MSI interrupt @domain associated tp @dev
* @domain: The domain to managing the interrupts
* @dev: Pointer to device struct of the device for which the interrupts
* are free
*/
void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev)
{
struct msi_desc *desc;
for_each_msi_entry(desc, dev) {
irq_domain_free_irqs(desc->irq, desc->nvec_used);
desc->irq = 0;
}
}
/**
* msi_get_domain_info - Get the MSI interrupt domain info for @domain
* @domain: The interrupt domain to retrieve data from