diff options
| author | Koichiro Den <den@valinux.co.jp> | 2026-05-13 11:49:23 +0900 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2026-06-23 11:37:44 -0500 |
| commit | 1fda82e37e00eb679d762756867b2e7508dd73f9 (patch) | |
| tree | 70f3da2f503d62eafcf7c4645d2612925f1b4c17 /drivers | |
| parent | 4fdea8dbb62d746429498e07385a3ba0b0f6d1ab (diff) | |
| download | ath-1fda82e37e00eb679d762756867b2e7508dd73f9.tar.gz | |
NTB: epf: Implement .db_vector_count()/mask() for doorbells
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
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/ntb/hw/epf/ntb_hw_epf.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/ntb/hw/epf/ntb_hw_epf.c b/drivers/ntb/hw/epf/ntb_hw_epf.c index 10618e462229a..af57554728429 100644 --- a/drivers/ntb/hw/epf/ntb_hw_epf.c +++ b/drivers/ntb/hw/epf/ntb_hw_epf.c @@ -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, |