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PCI: pci-bridge-emul: Correctly set PCIe capabilities

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commit 1f1050c5e1 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@kernel.org
Fixes: 23a5fba4d9 ("PCI: Introduce PCI bridge emulated config space common logic")
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pali Rohár 2021-11-24 16:59:43 +01:00 committed by Greg Kroah-Hartman
parent ab57ac7299
commit e904b46073
3 changed files with 12 additions and 5 deletions
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4
drivers/pci/controller/pci-aardvark.c
View file

@ -863,7 +863,6 @@ advk_pci_bridge_emul_pcie_conf_read(struct pci_bridge_emul *bridge,
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(struct advk_pcie *pcie)
/* 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);

8
drivers/pci/controller/pci-mvebu.c
View file

@ -576,6 +576,8 @@ struct pci_bridge_emul_ops mvebu_pci_bridge_emul_ops = {
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(struct mvebu_pcie_port *port)
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;

5
drivers/pci/pci-bridge-emul.c
View file

@ -288,10 +288,7 @@ int pci_bridge_emul_init(struct pci_bridge_emul *bridge,
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),