This is a note to let you know that I've just added the patch titled
PCI: pci-bridge-emul: Correctly set PCIe capabilities
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
pci-pci-bridge-emul-correctly-set-pcie-capabilities.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1f1050c5e1fefb34ac90a506b43e9da803b5f8f7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@xxxxxxxxxx>
Date: Wed, 24 Nov 2021 16:59:43 +0100
Subject: PCI: pci-bridge-emul: Correctly set PCIe capabilities
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
From: Pali Rohár <pali@xxxxxxxxxx>
commit 1f1050c5e1fefb34ac90a506b43e9da803b5f8f7 upstream.
Older mvebu hardware provides PCIe Capability structure only in version 1.
New mvebu and aardvark hardware provides it in version 2. So do not force
version to 2 in pci_bridge_emul_init() and rather allow drivers to set
correct version. Drivers need to set version in pcie_conf.cap field without
overwriting PCI_CAP_LIST_ID register. Both drivers (mvebu and aardvark) do
not provide slot support yet, so do not set PCI_EXP_FLAGS_SLOT flag.
Link: https://lore.kernel.org/r/20211124155944.1290-6-pali@xxxxxxxxxx
Fixes: 23a5fba4d941 ("PCI: Introduce PCI bridge emulated config space common logic")
Signed-off-by: Pali Rohár <pali@xxxxxxxxxx>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/pci/controller/pci-aardvark.c | 4 +++-
drivers/pci/controller/pci-mvebu.c | 8 ++++++++
drivers/pci/pci-bridge-emul.c | 5 +----
3 files changed, 12 insertions(+), 5 deletions(-)
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -863,7 +863,6 @@ advk_pci_bridge_emul_pcie_conf_read(stru
return PCI_BRIDGE_EMUL_HANDLED;
}
- case PCI_CAP_LIST_ID:
case PCI_EXP_DEVCAP:
case PCI_EXP_DEVCTL:
*value = advk_readl(pcie, PCIE_CORE_PCIEXP_CAP + reg);
@@ -944,6 +943,9 @@ static int advk_sw_pci_bridge_init(struc
/* Support interrupt A for MSI feature */
bridge->conf.intpin = PCIE_CORE_INT_A_ASSERT_ENABLE;
+ /* Aardvark HW provides PCIe Capability structure in version 2 */
+ bridge->pcie_conf.cap = cpu_to_le16(2);
+
/* Indicates supports for Completion Retry Status */
bridge->pcie_conf.rootcap = cpu_to_le16(PCI_EXP_RTCAP_CRSVIS);
--- a/drivers/pci/controller/pci-mvebu.c
+++ b/drivers/pci/controller/pci-mvebu.c
@@ -576,6 +576,8 @@ struct pci_bridge_emul_ops mvebu_pci_bri
static void mvebu_pci_bridge_emul_init(struct mvebu_pcie_port *port)
{
struct pci_bridge_emul *bridge = &port->bridge;
+ u32 pcie_cap = mvebu_readl(port, PCIE_CAP_PCIEXP);
+ u8 pcie_cap_ver = ((pcie_cap >> 16) & PCI_EXP_FLAGS_VERS);
bridge->conf.vendor = PCI_VENDOR_ID_MARVELL;
bridge->conf.device = mvebu_readl(port, PCIE_DEV_ID_OFF) >> 16;
@@ -588,6 +590,12 @@ static void mvebu_pci_bridge_emul_init(s
bridge->conf.iolimit = PCI_IO_RANGE_TYPE_32;
}
+ /*
+ * Older mvebu hardware provides PCIe Capability structure only in
+ * version 1. New hardware provides it in version 2.
+ */
+ bridge->pcie_conf.cap = cpu_to_le16(pcie_cap_ver);
+
bridge->has_pcie = true;
bridge->data = port;
bridge->ops = &mvebu_pci_bridge_emul_ops;
--- a/drivers/pci/pci-bridge-emul.c
+++ b/drivers/pci/pci-bridge-emul.c
@@ -288,10 +288,7 @@ int pci_bridge_emul_init(struct pci_brid
if (bridge->has_pcie) {
bridge->conf.capabilities_pointer = PCI_CAP_PCIE_START;
bridge->pcie_conf.cap_id = PCI_CAP_ID_EXP;
- /* Set PCIe v2, root port, slot support */
- bridge->pcie_conf.cap =
- cpu_to_le16(PCI_EXP_TYPE_ROOT_PORT << 4 | 2 |
- PCI_EXP_FLAGS_SLOT);
+ bridge->pcie_conf.cap |= cpu_to_le16(PCI_EXP_TYPE_ROOT_PORT << 4);
bridge->pcie_cap_regs_behavior =
kmemdup(pcie_cap_regs_behavior,
sizeof(pcie_cap_regs_behavior),
Patches currently in stable-queue which might be from pali@xxxxxxxxxx are
queue-5.4/pci-pci-bridge-emul-correctly-set-pcie-capabilities.patch
queue-5.4/pci-pci-bridge-emul-properly-mark-reserved-pcie-bits-in-pci-config-space.patch
queue-5.4/pci-pci-bridge-emul-set-pci_status_cap_list-for-pcie-device.patch
queue-5.4/arm-dts-armada-38x-add-generic-compatible-to-uart-no.patch
