(2010/07/31 7:34), Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@xxxxxxx>
> Subject: PCI / PCIe: Disable PCIe port services during port initialization
>
> In principle PCIe port services may be enabled by the BIOS, so it's
> better to disable them during port initialization to avoid spurious
> events from being generated.
>
> Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
> ---
> drivers/pci/pcie/portdrv_core.c | 29 ++++++++++++++++++++++++++---
> 1 file changed, 26 insertions(+), 3 deletions(-)
>
> Index: linux-2.6/drivers/pci/pcie/portdrv_core.c
> ===================================================================
> --- linux-2.6.orig/drivers/pci/pcie/portdrv_core.c
> +++ linux-2.6/drivers/pci/pcie/portdrv_core.c
> @@ -256,20 +256,43 @@ static int get_port_device_capability(st
> /* Hot-Plug Capable */
> if ((cap_mask & PCIE_PORT_SERVICE_HP) && (reg16 & PCI_EXP_FLAGS_SLOT)) {
> pci_read_config_dword(dev, pos + PCI_EXP_SLTCAP, ®32);
> - if (reg32 & PCI_EXP_SLTCAP_HPC)
> + if (reg32 & PCI_EXP_SLTCAP_HPC) {
> services |= PCIE_PORT_SERVICE_HP;
> + /*
> + * Disable hot-plug interrupts in case they have been
> + * enabled by the BIOS and the hot-plug service driver
> + * is not loaded.
> + */
> + pos += PCI_EXP_SLTCTL;
> + pci_read_config_word(dev, pos, ®16);
> + reg16 &= ~(PCI_EXP_SLTCTL_CCIE | PCI_EXP_SLTCTL_HPIE);
> + pci_write_config_word(dev, pos, reg16);
> + }
> }
> /* AER capable */
> if ((cap_mask & PCIE_PORT_SERVICE_AER)
> - && pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR))
> + && pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR)) {
> services |= PCIE_PORT_SERVICE_AER;
> + /*
> + * Disable AER on this port in case it's been enabled by the
> + * BIOS (the AER service driver will enable it when necessary).
> + */
> + pci_disable_pcie_error_reporting(dev);
> + }
> /* VC support */
> if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_VC))
> services |= PCIE_PORT_SERVICE_VC;
> /* Root ports are capable of generating PME too */
> if ((cap_mask & PCIE_PORT_SERVICE_PME)
> - && dev->pcie_type == PCI_EXP_TYPE_ROOT_PORT)
> + && dev->pcie_type == PCI_EXP_TYPE_ROOT_PORT) {
> services |= PCIE_PORT_SERVICE_PME;
> + /*
> + * Disable PME interrupt on this port in case it's been enabled
> + * by the BIOS (the PME service driver will enable it when
> + * necessary).
> + */
> + pcie_pme_interrupt_enable(dev, false);
> + }
>
> return services;
> }
>
I believe that comments described well are always welcomed.
Reviewed-by: Hidetoshi Seto <seto.hidetoshi@xxxxxxxxxxxxxx>
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