linux-kernel - [PATCH v7 4/6] PCI: dwc: Advertise dynamic inbound mapping support

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Message-ID: <20260113162719.3710268-5-den@valinux.co.jp>
Date: Wed, 14 Jan 2026 01:27:17 +0900
From: Koichiro Den <den@...inux.co.jp>
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Subject: [PATCH v7 4/6] PCI: dwc: Advertise dynamic inbound mapping support

The DesignWare EP core has supported updating the inbound iATU mapping
for an already configured BAR (i.e. allowing pci_epc_set_bar() to be
called again without a prior pci_epc_clear_bar()) since
commit 4284c88fff0e ("PCI: designware-ep: Allow pci_epc_set_bar() update
inbound map address").

Now that the EPC layer exposes this capability via the
dynamic_inbound_mapping feature bit, set the bit centrally in the
DesignWare EP layer so that all DWC-based EP glue drivers report it
consistently, without duplicating the same flag in each individual
driver.

No functional change intended. This only advertises existing behavior to
EPF drivers.

Suggested-by: Niklas Cassel <cassel@...nel.org>
Signed-off-by: Koichiro Den <den@...inux.co.jp>
---
 drivers/pci/controller/dwc/pcie-designware-ep.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index 1195d401df19..0e5a8d200b00 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -626,11 +626,19 @@ static const struct pci_epc_features*
 dw_pcie_ep_get_features(struct pci_epc *epc, u8 func_no, u8 vfunc_no)
 {
 	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
+	struct pci_epc_features *features;
 
 	if (!ep->ops->get_features)
 		return NULL;
 
-	return ep->ops->get_features(ep);
+	features = ep->ops->get_features(ep);
+	if (!features)
+		return NULL;
+
+	/* All DWC-based glue drivers support dynamic inbound mapping */
+	features->dynamic_inbound_mapping = true;
+
+	return features;
 }
 
 static const struct pci_epc_ops epc_ops = {
-- 
2.51.0