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genirq/msi: Provide msi_device_populate/destroy_sysfs()

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Add new allocation functions which can be activated by domain info
flags. They store the groups pointer in struct msi_device_data.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20211210221813.988659194@linutronix.de
This commit is contained in:
Thomas Gleixner 2021-12-10 23:19:03 +01:00
parent 686073e9f8
commit bf6e054e0e
2 changed files with 44 additions and 2 deletions
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4
include/linux/msi.h
View file

@ -56,6 +56,8 @@ struct irq_data;
struct msi_desc;
struct pci_dev;
struct platform_msi_priv_data;
struct attribute_group;
void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
#ifdef CONFIG_GENERIC_MSI_IRQ
void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);
@ -174,9 +176,11 @@ struct msi_desc {
/**
* msi_device_data - MSI per device data
* @properties: MSI properties which are interesting to drivers
* @attrs: Pointer to the sysfs attribute group
*/
struct msi_device_data {
unsigned long properties;
const struct attribute_group **attrs;
};
int msi_setup_device_data(struct device *dev);

42
kernel/irq/msi.c
View file

@ -199,6 +199,20 @@ const struct attribute_group **msi_populate_sysfs(struct device *dev)
return ERR_PTR(ret);
}
/**
* msi_device_populate_sysfs - Populate msi_irqs sysfs entries for a device
* @dev: The device (PCI, platform etc) which will get sysfs entries
*/
int msi_device_populate_sysfs(struct device *dev)
{
const struct attribute_group **group = msi_populate_sysfs(dev);
if (IS_ERR(group))
return PTR_ERR(group);
dev->msi.data->attrs = group;
return 0;
}
/**
* msi_destroy_sysfs - Destroy msi_irqs sysfs entries for devices
* @dev: The device(PCI, platform etc) who will remove sysfs entries
@ -225,6 +239,17 @@ void msi_destroy_sysfs(struct device *dev, const struct attribute_group **msi_ir
kfree(msi_irq_groups);
}
}
/**
* msi_device_destroy_sysfs - Destroy msi_irqs sysfs entries for a device
* @dev: The device (PCI, platform etc) for which to remove
* sysfs entries
*/
void msi_device_destroy_sysfs(struct device *dev)
{
msi_destroy_sysfs(dev, dev->msi.data->attrs);
dev->msi.data->attrs = NULL;
}
#endif
#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
@ -672,8 +697,19 @@ int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
{
struct msi_domain_info *info = domain->host_data;
struct msi_domain_ops *ops = info->ops;
int ret;
return ops->domain_alloc_irqs(domain, dev, nvec);
ret = ops->domain_alloc_irqs(domain, dev, nvec);
if (ret)
return ret;
if (!(info->flags & MSI_FLAG_DEV_SYSFS))
return 0;
ret = msi_device_populate_sysfs(dev);
if (ret)
msi_domain_free_irqs(domain, dev);
return ret;
}
void __msi_domain_free_irqs(struct irq_domain *domain, struct device *dev)
@ -712,7 +748,9 @@ void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev)
struct msi_domain_info *info = domain->host_data;
struct msi_domain_ops *ops = info->ops;
return ops->domain_free_irqs(domain, dev);
if (info->flags & MSI_FLAG_DEV_SYSFS)
msi_device_destroy_sysfs(dev);
ops->domain_free_irqs(domain, dev);
}
/**