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Koichiro Den
2579f3f7f5
Implement .db_vector_count() and .db_vector_mask() so NTB core/clients can map doorbell events to per-vector work and avoid the thundering-herd behavior. pci-epf-vntb reserves two slots in db_count: slot 0 for link events and slot 1 which is historically unused. Therefore the number of doorbell vectors is (db_count - 2). Report vectors as 0..N-1 and return BIT_ULL(db_vector) for the corresponding doorbell bit. Build db_valid_mask from a validated vector count so out-of-range db_count values cannot create invalid shifts. Signed-off-by: Koichiro Den <[email protected]> Signed-off-by: Manivannan Sadhasivam <[email protected]> Signed-off-by: Bjorn Helgaas <[email protected]> Reviewed-by: Frank Li <[email protected]> Link: https://patch.msgid.link/[email protected]