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Revision 8f4fd86aa5d6aa122619623910065d236592e37c authored by David Woodhouse on 06 January 2021, 15:39:55 UTC, committed by Juergen Gross on 13 January 2021, 15:12:03 UTC 
xen: Set platform PCI device INTX affinity to CPU0
 
With INTX or GSI delivery, Xen uses the event channel structures of CPU0.

If the interrupt gets handled by Linux on a different CPU, then no events
are seen as pending. Rather than introducing locking to allow other CPUs
to process CPU0's events, just ensure that the PCI interrupts happens
only on CPU0.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Link: https://lore.kernel.org/r/20210106153958.584169-3-dwmw2@infradead.org
Signed-off-by: Juergen Gross <jgross@suse.com>
1 parent 3499ba8
Raw File
sysfs.c 
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * PPS sysfs support
 *
 * Copyright (C) 2007-2009   Rodolfo Giometti <giometti@linux.it>
 */


#include <linux/device.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/pps_kernel.h>

/*
 * Attribute functions
 */

static ssize_t assert_show(struct device *dev, struct device_attribute *attr,
			   char *buf)
{
	struct pps_device *pps = dev_get_drvdata(dev);

	if (!(pps->info.mode & PPS_CAPTUREASSERT))
		return 0;

	return sprintf(buf, "%lld.%09d#%d\n",
			(long long) pps->assert_tu.sec, pps->assert_tu.nsec,
			pps->assert_sequence);
}
static DEVICE_ATTR_RO(assert);

static ssize_t clear_show(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	struct pps_device *pps = dev_get_drvdata(dev);

	if (!(pps->info.mode & PPS_CAPTURECLEAR))
		return 0;

	return sprintf(buf, "%lld.%09d#%d\n",
			(long long) pps->clear_tu.sec, pps->clear_tu.nsec,
			pps->clear_sequence);
}
static DEVICE_ATTR_RO(clear);

static ssize_t mode_show(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct pps_device *pps = dev_get_drvdata(dev);

	return sprintf(buf, "%4x\n", pps->info.mode);
}
static DEVICE_ATTR_RO(mode);

static ssize_t echo_show(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct pps_device *pps = dev_get_drvdata(dev);

	return sprintf(buf, "%d\n", !!pps->info.echo);
}
static DEVICE_ATTR_RO(echo);

static ssize_t name_show(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct pps_device *pps = dev_get_drvdata(dev);

	return sprintf(buf, "%s\n", pps->info.name);
}
static DEVICE_ATTR_RO(name);

static ssize_t path_show(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct pps_device *pps = dev_get_drvdata(dev);

	return sprintf(buf, "%s\n", pps->info.path);
}
static DEVICE_ATTR_RO(path);

static struct attribute *pps_attrs[] = {
	&dev_attr_assert.attr,
	&dev_attr_clear.attr,
	&dev_attr_mode.attr,
	&dev_attr_echo.attr,
	&dev_attr_name.attr,
	&dev_attr_path.attr,
	NULL,
};

static const struct attribute_group pps_group = {
	.attrs = pps_attrs,
};

const struct attribute_group *pps_groups[] = {
	&pps_group,
	NULL,
};
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