linux-kernel - [RFC PATCH v2 27/27] NTB: epf: Add an additional memory window (MW2) barno mapping on Renesas R-Car

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Message-ID: <20251129160405.2568284-28-den@valinux.co.jp>
Date: Sun, 30 Nov 2025 01:04:05 +0900
From: Koichiro Den <den@...inux.co.jp>
To: ntb@...ts.linux.dev,
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Subject: [RFC PATCH v2 27/27] NTB: epf: Add an additional memory window (MW2) barno mapping on Renesas R-Car

To enable remote eDMA mode on NTB transport, one additional memory
window is required. Since a single BAR can now be split into multiple
memory windows, add MW2 to BAR2 on R-Car.

For pci_epf_vntb configfs settings, users who want to use MW2 (e.g. to
enable remote eDMA mode for NTB transport as mentioned above) may
configure as follows:

  $ echo 2       > functions/pci_epf_vntb/func1/pci_epf_vntb.0/num_mws
  $ echo 0xE0000 > functions/pci_epf_vntb/func1/pci_epf_vntb.0/mw1
  $ echo 0x20000 > functions/pci_epf_vntb/func1/pci_epf_vntb.0/mw2
  $ echo 0xE0000 > functions/pci_epf_vntb/func1/pci_epf_vntb.0/mw2_offset
  $ echo 2       > functions/pci_epf_vntb/func1/pci_epf_vntb.0/mw1_bar
  $ echo 2       > functions/pci_epf_vntb/func1/pci_epf_vntb.0/mw2_bar

Signed-off-by: Koichiro Den <den@...inux.co.jp>
---
 drivers/ntb/hw/epf/ntb_hw_epf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ntb/hw/epf/ntb_hw_epf.c b/drivers/ntb/hw/epf/ntb_hw_epf.c
index 21eb26b2f7cc..19a4c07bbc8f 100644
--- a/drivers/ntb/hw/epf/ntb_hw_epf.c
+++ b/drivers/ntb/hw/epf/ntb_hw_epf.c
@@ -792,7 +792,7 @@ static const enum pci_barno rcar_barno[NTB_BAR_NUM] = {
 	[BAR_PEER_SPAD]	= BAR_0,
 	[BAR_DB]	= BAR_4,
 	[BAR_MW1]	= BAR_2,
-	[BAR_MW2]	= NO_BAR,
+	[BAR_MW2]	= BAR_2,
 	[BAR_MW3]	= NO_BAR,
 	[BAR_MW4]	= NO_BAR,
 };
-- 
2.48.1