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PCI/DPC: Enable DPC only if AER is available

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The "Determination of DPC Control" implementation note in PCIe r4.0, sec
6.1.10, recommends the operating system always link DPC control to the
control of AER, as the two functionalities are strongly connected.

To avoid conflicts over whether platform firmware or the OS controls DPC,
enable DPC only if AER is enabled in the OS, and the device's error
handling does not have firmware-first AER handling.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <helgaas@kernel.org>
This commit is contained in:
Keith Busch 2018-01-24 17:03:18 -06:00 committed by Bjorn Helgaas
parent aa6ca5a9d7
commit eed85ff4c0
3 changed files with 7 additions and 3 deletions
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2
drivers/pci/pcie/Kconfig
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@ -92,7 +92,7 @@ config PCIE_PME
config PCIE_DPC
bool "PCIe Downstream Port Containment support"
depends on PCIEPORTBUS
depends on PCIEPORTBUS && PCIEAER
default n
help
This enables PCI Express Downstream Port Containment (DPC)

4
drivers/pci/pcie/pcie-dpc.c
View File

@ -15,6 +15,7 @@
#include <linux/pci.h>
#include <linux/pcieport_if.h>
#include "../pci.h"
#include "aer/aerdrv.h"
struct rp_pio_header_log_regs {
u32 dw0;
@ -309,6 +310,9 @@ static int dpc_probe(struct pcie_device *dev)
int status;
u16 ctl, cap;
if (pcie_aer_get_firmware_first(pdev))
return -ENOTSUPP;
dpc = devm_kzalloc(device, sizeof(*dpc), GFP_KERNEL);
if (!dpc)
return -ENOMEM;

4
drivers/pci/pcie/portdrv_core.c
View File

@ -216,9 +216,9 @@ static int get_port_device_capability(struct pci_dev *dev)
return 0;
cap_mask = PCIE_PORT_SERVICE_PME | PCIE_PORT_SERVICE_HP
| PCIE_PORT_SERVICE_VC | PCIE_PORT_SERVICE_DPC;
| PCIE_PORT_SERVICE_VC;
if (pci_aer_available())
cap_mask |= PCIE_PORT_SERVICE_AER;
cap_mask |= PCIE_PORT_SERVICE_AER | PCIE_PORT_SERVICE_DPC;
if (pcie_ports_auto)
pcie_port_platform_notify(dev, &cap_mask);