mirror of
https://github.com/torvalds/linux
synced 2024-09-21 11:38:48 +00:00
c39fae1416
Apparently, some machines may have problems with PCI run-time power management if MSIs are used for the native PCIe PME signaling. In particular, on the MSI Wind U-100 PCIe PME interrupts are not generated by a PCIe root port after a resume from suspend to RAM, if the system wake-up was triggered by a PME from the device attached to this port. [It doesn't help to free the interrupt on suspend and request it back on resume, even if that is done along with disabling the MSI and re-enabling it, respectively.] However, if INTx interrupts are used for this purpose on the same machine, everything works just fine. For this reason, add a kernel command line switch allowing one to request that MSIs be not used for the native PCIe PME signaling, introduce a DMI table allowing us to blacklist machines that need this switch to be set by default and put the MSI Wind U-100 into this table. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
/*
|
|
* File: portdrv.h
|
|
* Purpose: PCI Express Port Bus Driver's Internal Data Structures
|
|
*
|
|
* Copyright (C) 2004 Intel
|
|
* Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
|
|
*/
|
|
|
|
#ifndef _PORTDRV_H_
|
|
#define _PORTDRV_H_
|
|
|
|
#include <linux/compiler.h>
|
|
|
|
#define PCIE_PORT_DEVICE_MAXSERVICES 4
|
|
/*
|
|
* According to the PCI Express Base Specification 2.0, the indices of
|
|
* the MSI-X table entires used by port services must not exceed 31
|
|
*/
|
|
#define PCIE_PORT_MAX_MSIX_ENTRIES 32
|
|
|
|
#define get_descriptor_id(type, service) (((type - 4) << 4) | service)
|
|
|
|
extern struct bus_type pcie_port_bus_type;
|
|
extern int pcie_port_device_register(struct pci_dev *dev);
|
|
#ifdef CONFIG_PM
|
|
extern int pcie_port_device_suspend(struct device *dev);
|
|
extern int pcie_port_device_resume(struct device *dev);
|
|
#endif
|
|
extern void pcie_port_device_remove(struct pci_dev *dev);
|
|
extern int __must_check pcie_port_bus_register(void);
|
|
extern void pcie_port_bus_unregister(void);
|
|
|
|
#ifdef CONFIG_PCIE_PME
|
|
extern bool pcie_pme_msi_disabled;
|
|
|
|
static inline void pcie_pme_disable_msi(void)
|
|
{
|
|
pcie_pme_msi_disabled = true;
|
|
}
|
|
|
|
static inline bool pcie_pme_no_msi(void)
|
|
{
|
|
return pcie_pme_msi_disabled;
|
|
}
|
|
#else /* !CONFIG_PCIE_PME */
|
|
static inline void pcie_pme_disable_msi(void) {}
|
|
static inline bool pcie_pme_no_msi(void) { return false; }
|
|
#endif /* !CONFIG_PCIE_PME */
|
|
|
|
#endif /* _PORTDRV_H_ */
|