linux-kernel - [PATCH 3/6] PCI: pci-bridge-emul: Add definitions for missing capabilities registers

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Message-Id: <20211124155944.1290-4-pali@kernel.org>
Date:   Wed, 24 Nov 2021 16:59:41 +0100
From:   Pali Rohár <pali@...nel.org>
To:     Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Marek Behún <kabel@...nel.org>
Cc:     linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/6] PCI: pci-bridge-emul: Add definitions for missing capabilities registers

pci-bridge-emul driver already allocates buffer for capabilities up to the
PCI_EXP_SLTSTA2 register, but does not define bit access behavior for these
registers. Fix it by adding missing definitions.

Signed-off-by: Pali Rohár <pali@...nel.org>
Reviewed-by: Marek Behún <kabel@...nel.org>
Fixes: 23a5fba4d941 ("PCI: Introduce PCI bridge emulated config space common logic")
Cc: stable@...r.kernel.org
---
 drivers/pci/pci-bridge-emul.c | 43 +++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/drivers/pci/pci-bridge-emul.c b/drivers/pci/pci-bridge-emul.c
index 0cbb4e3ca827..31ff7448bded 100644
--- a/drivers/pci/pci-bridge-emul.c
+++ b/drivers/pci/pci-bridge-emul.c
@@ -256,6 +256,49 @@ struct pci_bridge_reg_behavior pcie_cap_regs_behavior[PCI_CAP_PCIE_SIZEOF / 4] =
 		.ro = GENMASK(15, 0) | PCI_EXP_RTSTA_PENDING,
 		.w1c = PCI_EXP_RTSTA_PME,
 	},
+
+	[PCI_EXP_DEVCAP2 / 4] = {
+		/*
+		 * Device capabilities 2 register has reserved bits [30:27].
+		 * Also bits [26:24] are reserved for non-upstream ports.
+		 */
+		.ro = BIT(31) | GENMASK(23, 0),
+	},
+
+	[PCI_EXP_DEVCTL2 / 4] = {
+		/*
+		 * Device control 2 register is RW. Bit 11 is reserved for
+		 * non-upstream ports.
+		 *
+		 * Device status 2 register is reserved.
+		 */
+		.rw = GENMASK(15, 12) | GENMASK(10, 0),
+	},
+
+	[PCI_EXP_LNKCAP2 / 4] = {
+		/* Link capabilities 2 register has reserved bits [30:25] and 0. */
+		.ro = BIT(31) | GENMASK(24, 1),
+	},
+
+	[PCI_EXP_LNKCTL2 / 4] = {
+		/*
+		 * Link control 2 register is RW.
+		 *
+		 * Link status 2 register has bits 5, 15 W1C;
+		 * bits 10, 11 reserved and others are RO.
+		 */
+		.rw = GENMASK(15, 0),
+		.w1c = (BIT(15) | BIT(5)) << 16,
+		.ro = (GENMASK(14, 12) | GENMASK(9, 6) | GENMASK(4, 0)) << 16,
+	},
+
+	[PCI_EXP_SLTCAP2 / 4] = {
+		/* Slot capabilities 2 register is reserved. */
+	},
+
+	[PCI_EXP_SLTCTL2 / 4] = {
+		/* Both Slot control 2 and Slot status 2 registers are reserved. */
+	},
 };
 
 /*
-- 
2.20.1