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Revision a99b646afa8a02571ea298bedca6592d818229cd authored by dingtianhong on 15 August 2017, 03:23:23 UTC, committed by David S. Miller on 15 August 2017, 05:14:50 UTC 
PCI: Disable PCIe Relaxed Ordering if unsupported
 
When bit4 is set in the PCIe Device Control register, it indicates
whether the device is permitted to use relaxed ordering.
On some platforms using relaxed ordering can have performance issues or
due to erratum can cause data-corruption. In such cases devices must avoid
using relaxed ordering.

The patch adds a new flag PCI_DEV_FLAGS_NO_RELAXED_ORDERING to indicate that
Relaxed Ordering (RO) attribute should not be used for Transaction Layer
Packets (TLP) targeted towards these affected root complexes.

This patch checks if there is any node in the hierarchy that indicates that
using relaxed ordering is not safe. In such cases the patch turns off the
relaxed ordering by clearing the capability for this device.

Signed-off-by: Casey Leedom <leedom@chelsio.com>
Signed-off-by: Ding Tianhong <dingtianhong@huawei.com>
Acked-by: Ashok Raj <ashok.raj@intel.com>
Acked-by: Alexander Duyck <alexander.h.duyck@intel.com>
Acked-by: Casey Leedom <leedom@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Raw File
quirks.h 
#ifndef __USBAUDIO_QUIRKS_H
#define __USBAUDIO_QUIRKS_H

struct audioformat;
struct snd_usb_endpoint;
struct snd_usb_substream;

int snd_usb_create_quirk(struct snd_usb_audio *chip,
			 struct usb_interface *iface,
			 struct usb_driver *driver,
			 const struct snd_usb_audio_quirk *quirk);

int snd_usb_apply_interface_quirk(struct snd_usb_audio *chip,
				  int iface,
				  int altno);

int snd_usb_apply_boot_quirk(struct usb_device *dev,
			     struct usb_interface *intf,
			     const struct snd_usb_audio_quirk *quirk,
			     unsigned int usb_id);

void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
			      struct audioformat *fmt);

bool snd_usb_get_sample_rate_quirk(struct snd_usb_audio *chip);

int snd_usb_is_big_endian_format(struct snd_usb_audio *chip,
				 struct audioformat *fp);

void snd_usb_endpoint_start_quirk(struct snd_usb_endpoint *ep);

void snd_usb_set_interface_quirk(struct usb_device *dev);
void snd_usb_ctl_msg_quirk(struct usb_device *dev, unsigned int pipe,
			   __u8 request, __u8 requesttype, __u16 value,
			   __u16 index, void *data, __u16 size);

int snd_usb_select_mode_quirk(struct snd_usb_substream *subs,
			      struct audioformat *fmt);

u64 snd_usb_interface_dsd_format_quirks(struct snd_usb_audio *chip,
					struct audioformat *fp,
					unsigned int sample_bytes);

#endif /* __USBAUDIO_QUIRKS_H */
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