linux-kernel - [PATCH v2 1/4] PCI: qcom-ep: Mark BAR0/BAR2 as 64bit BARs and BAR1/BAR3 as RESERVED

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Message-Id: <20241129092415.29437-2-manivannan.sadhasivam@linaro.org>
Date: Fri, 29 Nov 2024 14:54:12 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: kw@...ux.com,
	gregkh@...uxfoundation.org,
	arnd@...db.de,
	lpieralisi@...nel.org,
	shuah@...nel.org
Cc: kishon@...nel.org,
	aman1.gupta@...sung.com,
	p.rajanbabu@...sung.com,
	linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	bhelgaas@...gle.com,
	linux-arm-msm@...r.kernel.org,
	robh@...nel.org,
	linux-kselftest@...r.kernel.org,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	stable+noautosel@...nel.org
Subject: [PATCH v2 1/4] PCI: qcom-ep: Mark BAR0/BAR2 as 64bit BARs and BAR1/BAR3 as RESERVED

On all Qcom endpoint SoCs, BAR0/BAR2 are 64bit BARs by default and software
cannot change the type. So mark the those BARs as 64bit BARs and also mark
the successive BAR1/BAR3 as RESERVED BARs so that the EPF drivers cannot
use them.

Cc: stable+noautosel@...nel.org # depends on patch introducing only_64bit flag
Fixes: f55fee56a631 ("PCI: qcom-ep: Add Qualcomm PCIe Endpoint controller driver")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 drivers/pci/controller/dwc/pcie-qcom-ep.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
index e588fcc54589..f925c4ad4294 100644
--- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
+++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
@@ -823,6 +823,10 @@ static const struct pci_epc_features qcom_pcie_epc_features = {
 	.msi_capable = true,
 	.msix_capable = false,
 	.align = SZ_4K,
+	.bar[BAR_0] = { .only_64bit = true, },
+	.bar[BAR_1] = { .type = BAR_RESERVED, },
+	.bar[BAR_2] = { .only_64bit = true, },
+	.bar[BAR_3] = { .type = BAR_RESERVED, },
 };
 
 static const struct pci_epc_features *
-- 
2.25.1