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genirq/msi: Provide domain flags to allocate/free MSI descriptors automatically

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Provide domain info flags which tell the core to allocate simple
descriptors or to free descriptors when the interrupts are freed and
implement the required functionality.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20211206210747.928198636@linutronix.de
This commit is contained in:
Thomas Gleixner 2021-12-06 23:51:12 +01:00
parent 6029052536
commit 645474e2ce
2 changed files with 65 additions and 0 deletions
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17
include/linux/msi.h
View file

@ -105,6 +105,8 @@ struct pci_msi_desc {
};
};
#define MSI_MAX_INDEX ((unsigned int)USHRT_MAX)
/**
* struct msi_desc - Descriptor structure for MSI based interrupts
* @list: List head for management
@ -248,6 +250,17 @@ static inline void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg)
#endif /* CONFIG_PCI_MSI */
int msi_add_msi_desc(struct device *dev, struct msi_desc *init_desc);
void msi_free_msi_descs_range(struct device *dev, enum msi_desc_filter filter,
unsigned int first_index, unsigned int last_index);
/**
* msi_free_msi_descs - Free MSI descriptors of a device
* @dev: Device to free the descriptors
*/
static inline void msi_free_msi_descs(struct device *dev)
{
msi_free_msi_descs_range(dev, MSI_DESC_ALL, 0, MSI_MAX_INDEX);
}
struct msi_desc *alloc_msi_entry(struct device *dev, int nvec,
const struct irq_affinity_desc *affinity);
@ -408,6 +421,10 @@ enum {
MSI_FLAG_DEV_SYSFS = (1 << 7),
/* MSI-X entries must be contiguous */
MSI_FLAG_MSIX_CONTIGUOUS = (1 << 8),
/* Allocate simple MSI descriptors */
MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS = (1 << 9),
/* Free MSI descriptors */
MSI_FLAG_FREE_MSI_DESCS = (1 << 10),
};
int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,

48
kernel/irq/msi.c
View file

@ -119,6 +119,32 @@ static int msi_add_simple_msi_descs(struct device *dev, unsigned int index, unsi
return -ENOMEM;
}
/**
* msi_free_msi_descs_range - Free MSI descriptors of a device
* @dev: Device to free the descriptors
* @filter: Descriptor state filter
* @first_index: Index to start freeing from
* @last_index: Last index to be freed
*/
void msi_free_msi_descs_range(struct device *dev, enum msi_desc_filter filter,
unsigned int first_index, unsigned int last_index)
{
struct msi_desc *desc;
lockdep_assert_held(&dev->msi.data->mutex);
msi_for_each_desc(desc, dev, filter) {
/*
* Stupid for now to handle MSI device domain until the
* storage is switched over to an xarray.
*/
if (desc->msi_index < first_index || desc->msi_index > last_index)
continue;
list_del(&desc->list);
free_msi_entry(desc);
}
}
void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
{
*msg = entry->msg;
@ -879,6 +905,16 @@ int __msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
return 0;
}
static int msi_domain_add_simple_msi_descs(struct msi_domain_info *info,
struct device *dev,
unsigned int num_descs)
{
if (!(info->flags & MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS))
return 0;
return msi_add_simple_msi_descs(dev, 0, num_descs);
}
/**
* msi_domain_alloc_irqs_descs_locked - Allocate interrupts from a MSI interrupt domain
* @domain: The domain to allocate from
@ -901,6 +937,10 @@ int msi_domain_alloc_irqs_descs_locked(struct irq_domain *domain, struct device
lockdep_assert_held(&dev->msi.data->mutex);
ret = msi_domain_add_simple_msi_descs(info, dev, nvec);
if (ret)
return ret;
ret = ops->domain_alloc_irqs(domain, dev, nvec);
if (ret)
goto cleanup;
@ -962,6 +1002,13 @@ void __msi_domain_free_irqs(struct irq_domain *domain, struct device *dev)
}
}
static void msi_domain_free_msi_descs(struct msi_domain_info *info,
struct device *dev)
{
if (info->flags & MSI_FLAG_FREE_MSI_DESCS)
msi_free_msi_descs(dev);
}
/**
* msi_domain_free_irqs_descs_locked - Free interrupts from a MSI interrupt @domain associated to @dev
* @domain: The domain to managing the interrupts
@ -982,6 +1029,7 @@ void msi_domain_free_irqs_descs_locked(struct irq_domain *domain, struct device
if (info->flags & MSI_FLAG_DEV_SYSFS)
msi_device_destroy_sysfs(dev);
ops->domain_free_irqs(domain, dev);
msi_domain_free_msi_descs(info, dev);
}
/**