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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
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@@ -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,