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NTB: epf: Implement .db_vector_count()/mask() for doorbells

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Implement .db_vector_count() and .db_vector_mask() so NTB core/clients can
map doorbell events to per-vector work.

Report vectors as 0..(db_count - 2) (skipping the unused slot) and return
BIT_ULL(db_vector) for the corresponding doorbell bit. Use
ntb_epf_db_vector_count() for bounds checks in ntb_epf_db_vector_mask(), so
the same lower-bound guard is applied before building the bitmask.

Signed-off-by: Koichiro Den <den@valinux.co.jp>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://patch.msgid.link/20260513024923.451765-13-den@valinux.co.jp
This commit is contained in:
Koichiro Den 2026-05-13 11:49:23 +09:00 committed by Bjorn Helgaas
parent 4fdea8dbb6
commit 1fda82e37e
1 changed files with 32 additions and 0 deletions
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32
drivers/ntb/hw/epf/ntb_hw_epf.c
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@ -434,6 +434,36 @@ static u64 ntb_epf_db_valid_mask(struct ntb_dev *ntb)
return ntb_ndev(ntb)->db_valid_mask;
}
static int ntb_epf_db_vector_count(struct ntb_dev *ntb)
{
struct ntb_epf_dev *ndev = ntb_ndev(ntb);
unsigned int db_count = ndev->db_count;
/*
* db_count includes an extra skipped slot due to the legacy
* doorbell layout. Expose only the real doorbell vectors.
*/
if (db_count < NTB_EPF_MIN_DB_COUNT)
return 0;
return db_count - 1;
}
static u64 ntb_epf_db_vector_mask(struct ntb_dev *ntb, int db_vector)
{
int nr_vec;
/*
* db_count includes one skipped slot in the legacy layout. Valid
* doorbell vectors are therefore [0 .. (db_count - 2)].
*/
nr_vec = ntb_epf_db_vector_count(ntb);
if (db_vector < 0 || db_vector >= nr_vec)
return 0;
return BIT_ULL(db_vector);
}
static int ntb_epf_db_set_mask(struct ntb_dev *ntb, u64 db_bits)
{
return 0;
@ -568,6 +598,8 @@ static const struct ntb_dev_ops ntb_epf_ops = {
.spad_count = ntb_epf_spad_count,
.peer_mw_count = ntb_epf_peer_mw_count,
.db_valid_mask = ntb_epf_db_valid_mask,
.db_vector_count = ntb_epf_db_vector_count,
.db_vector_mask = ntb_epf_db_vector_mask,
.db_set_mask = ntb_epf_db_set_mask,
.mw_set_trans = ntb_epf_mw_set_trans,
.mw_clear_trans = ntb_epf_mw_clear_trans,