ahci: use pci_alloc_irq_vectors
Use the new pci_alloc_irq_vectors API to allocate MSI-X and MSI vectors. The big advantage over the old code is that we can use the same API for MSI and MSI-X, and that we don't need to store the MSI-X vector mapping in driver-private data structures. This first conversion keeps the probe order as-is: MSI-X multi vector, MSI multi vector, MSI single vector, MSI-X single vector and last a single least legacy interrupt line. There is one small change of behavior: we now check the "MSI Revert to Single Message" flag for MSI-X in addition to MSI. Because the API to find the Linux IRQ number for a MSI/MSI-X vector is PCI specific, but libahaci is bus-agnostic I had to a get_irq_vector function pointer to struct ahci_host_priv. The alternative would be to move the multi-vector case of ahci_host_activate to ahci.c and just call ata_host_activate directly from the others users of ahci_host_activate. Signed-off-by:Christoph Hellwig <hch@lst.de> Signed-off-by:
Tejun Heo <tj@kernel.org>
parent
2536524a
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