linux-kernel - [PATCH AUTOSEL 6.12 101/486] PCI: dwc: Use resource start as ioremap() input in dw_pcie_pme_turn

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Message-Id: <20250505223922.2682012-101-sashal@kernel.org>
Date: Mon,  5 May 2025 18:32:57 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Frank Li <Frank.Li@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Sasha Levin <sashal@...nel.org>,
	jingoohan1@...il.com,
	manivannan.sadhasivam@...aro.org,
	lpieralisi@...nel.org,
	kw@...ux.com,
	linux-pci@...r.kernel.org
Subject: [PATCH AUTOSEL 6.12 101/486] PCI: dwc: Use resource start as ioremap() input in dw_pcie_pme_turn_off()

From: Frank Li <Frank.Li@....com>

[ Upstream commit 8f4a489b370e6612700aa16b9e4373b2d85d7503 ]

The msg_res region translates writes into PCIe Message TLPs. Previously we
mapped this region using atu.cpu_addr, the input address programmed into
the ATU.

"cpu_addr" is a misnomer because when a bus fabric translates addresses
between the CPU and the ATU, the ATU input address is different from the
CPU address.  A future patch will rename "cpu_addr" and correct the value
to be the ATU input address instead of the CPU physical address.

Map the msg_res region before writing to it using the msg_res resource
start, a CPU physical address.

Link: https://lore.kernel.org/r/20250315201548.858189-2-helgaas@kernel.org
Signed-off-by: Frank Li <Frank.Li@....com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/pci/controller/dwc/pcie-designware-host.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 120e2aca5164a..d428457d9c432 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -902,7 +902,7 @@ static int dw_pcie_pme_turn_off(struct dw_pcie *pci)
 	if (ret)
 		return ret;
 
-	mem = ioremap(atu.cpu_addr, pci->region_align);
+	mem = ioremap(pci->pp.msg_res->start, pci->region_align);
 	if (!mem)
 		return -ENOMEM;
 
-- 
2.39.5