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genirq/msi: Provide msi_alloc_msi_desc() and a simple allocator

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Provide msi_alloc_msi_desc() which takes a template MSI descriptor for
initializing a newly allocated descriptor. This allows to simplify various
usage sites of alloc_msi_entry() and moves the storage handling into the
core code.

For simple cases where only a linear vector space is required provide
msi_add_simple_msi_descs() which just allocates a linear range of MSI
descriptors and fills msi_desc::msi_index accordingly.

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/20211206210747.873833567@linutronix.de
This commit is contained in:
Thomas Gleixner 2021-12-06 23:51:10 +01:00
parent 1046f71d72
commit 6029052536
2 changed files with 61 additions and 0 deletions
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include/linux/msi.h
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@ -247,6 +247,8 @@ 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);
struct msi_desc *alloc_msi_entry(struct device *dev, int nvec,
const struct irq_affinity_desc *affinity);
void free_msi_entry(struct msi_desc *entry);