[RFC PATCH v4 32/38] NTB: epf: Add an additional memory window (MW2) barno mapping on Renesas R-Car
Koichiro Den <[email protected]>
| Newsgroups | dev.linux.lists.ntb,dev.linux.lists.iommu,org.kernel.vger.dmaengine,org.kernel.vger.linux-devicetree,org.kernel.vger.linux-doc,org.kernel.vger.linux-kernel,org.kernel.vger.linux-kselftest,org.kernel.vger.linux-pci,org.kernel.vger.linux-renesas-soc,org.kernel.vger.netdev |
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| Message-ID | <[email protected]> |
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 <[email protected]> --- 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 2cefe46d2520..007c93e34398 100644 --- a/drivers/ntb/hw/epf/ntb_hw_epf.c +++ b/drivers/ntb/hw/epf/ntb_hw_epf.c @@ -843,7 +843,7 @@ 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, }; -- 2.51.0