linux-kernel - FAILED: Patch "PCI: dwc: endpoint: Fix advertised resizable BAR size" failed to apply to 5.4-stable tree

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Message-ID: <20240327122350.2838878-1-sashal@kernel.org>
Date: Wed, 27 Mar 2024 08:23:49 -0400
From: Sasha Levin <sashal@...nel.org>
To: stable@...r.kernel.org,
	cassel@...nel.org
Cc: Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: FAILED: Patch "PCI: dwc: endpoint: Fix advertised resizable BAR size" failed to apply to 5.4-stable tree

The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@...r.kernel.org>.

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

>From 72e34b8593e08a0ee759b7a038e0b178418ea6f8 Mon Sep 17 00:00:00 2001
From: Niklas Cassel <cassel@...nel.org>
Date: Thu, 7 Mar 2024 12:15:20 +0100
Subject: [PATCH] PCI: dwc: endpoint: Fix advertised resizable BAR size
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The commit message in commit fc9a77040b04 ("PCI: designware-ep: Configure
Resizable BAR cap to advertise the smallest size") claims that it modifies
the Resizable BAR capability to only advertise support for 1 MB size BARs.

However, the commit writes all zeroes to PCI_REBAR_CAP (the register which
contains the possible BAR sizes that a BAR be resized to).

According to the spec, it is illegal to not have a bit set in
PCI_REBAR_CAP, and 1 MB is the smallest size allowed.

Set bit 4 in PCI_REBAR_CAP, so that we actually advertise support for a
1 MB BAR size.

Before:
        Capabilities: [2e8 v1] Physical Resizable BAR
                BAR 0: current size: 1MB
                BAR 1: current size: 1MB
                BAR 2: current size: 1MB
                BAR 3: current size: 1MB
                BAR 4: current size: 1MB
                BAR 5: current size: 1MB
After:
        Capabilities: [2e8 v1] Physical Resizable BAR
                BAR 0: current size: 1MB, supported: 1MB
                BAR 1: current size: 1MB, supported: 1MB
                BAR 2: current size: 1MB, supported: 1MB
                BAR 3: current size: 1MB, supported: 1MB
                BAR 4: current size: 1MB, supported: 1MB
                BAR 5: current size: 1MB, supported: 1MB

Fixes: fc9a77040b04 ("PCI: designware-ep: Configure Resizable BAR cap to advertise the smallest size")
Link: https://lore.kernel.org/linux-pci/20240307111520.3303774-1-cassel@kernel.org
Signed-off-by: Niklas Cassel <cassel@...nel.org>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@...nel.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: <stable@...r.kernel.org> # 5.2
---
 drivers/pci/controller/dwc/pcie-designware-ep.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index 5befed2dc02b7..389daebc43161 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -627,8 +627,13 @@ int dw_pcie_ep_init_complete(struct dw_pcie_ep *ep)
 		nbars = (reg & PCI_REBAR_CTRL_NBAR_MASK) >>
 			PCI_REBAR_CTRL_NBAR_SHIFT;
 
+		/*
+		 * PCIe r6.0, sec 7.8.6.2 require us to support at least one
+		 * size in the range from 1 MB to 512 GB. Advertise support
+		 * for 1 MB BAR size only.
+		 */
 		for (i = 0; i < nbars; i++, offset += PCI_REBAR_CTRL)
-			dw_pcie_writel_dbi(pci, offset + PCI_REBAR_CAP, 0x0);
+			dw_pcie_writel_dbi(pci, offset + PCI_REBAR_CAP, BIT(4));
 	}
 
 	/*
-- 
2.43.0