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NTB: epf: Make db_valid_mask cover only real doorbell bits

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ndev->db_count includes an unused doorbell slot due to the legacy extra
offset in the peer doorbell path. db_valid_mask must cover only the real
doorbell bits and exclude the unused slot.

Set db_valid_mask to BIT_ULL(db_count - 1) - 1.

Fixes: 812ce2f8d1 ("NTB: Add support for EPF PCI Non-Transparent Bridge")
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: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://patch.msgid.link/20260513024923.451765-10-den@valinux.co.jp
This commit is contained in:
Koichiro Den 2026-05-13 11:49:20 +09:00 committed by Bjorn Helgaas
parent 84af8a5f5e
commit 6eb7e28f1f
1 changed files with 5 additions and 1 deletions
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6
drivers/ntb/hw/epf/ntb_hw_epf.c
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@ -580,7 +580,11 @@ static int ntb_epf_init_dev(struct ntb_epf_dev *ndev)
return ret;
}
ndev->db_valid_mask = BIT_ULL(ndev->db_count) - 1;
/*
* ndev->db_count includes an extra skipped slot due to the legacy
* doorbell layout, hence -1.
*/
ndev->db_valid_mask = BIT_ULL(ndev->db_count - 1) - 1;
ndev->mw_count = readl(ndev->ctrl_reg + NTB_EPF_MW_COUNT);
ndev->spad_count = readl(ndev->ctrl_reg + NTB_EPF_SPAD_COUNT);