/*
 * Freescale SSI ALSA SoC Digital Audio Interface (DAI) debugging functions
 *
 * Copyright 2014 Markus Pargmann <mpa@pengutronix.de>, Pengutronix
 *
 * Splitted from fsl_ssi.c
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2.  This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 */

#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/kernel.h>

#include "fsl_ssi.h"

void fsl_ssi_dbg_isr(struct fsl_ssi_dbg *dbg, u32 sisr)
{
	if (sisr & CCSR_SSI_SISR_RFRC)
		dbg->stats.rfrc++;

	if (sisr & CCSR_SSI_SISR_TFRC)
		dbg->stats.tfrc++;

	if (sisr & CCSR_SSI_SISR_CMDAU)
		dbg->stats.cmdau++;

	if (sisr & CCSR_SSI_SISR_CMDDU)
		dbg->stats.cmddu++;

	if (sisr & CCSR_SSI_SISR_RXT)
		dbg->stats.rxt++;

	if (sisr & CCSR_SSI_SISR_RDR1)
		dbg->stats.rdr1++;

	if (sisr & CCSR_SSI_SISR_RDR0)
		dbg->stats.rdr0++;

	if (sisr & CCSR_SSI_SISR_TDE1)
		dbg->stats.tde1++;

	if (sisr & CCSR_SSI_SISR_TDE0)
		dbg->stats.tde0++;

	if (sisr & CCSR_SSI_SISR_ROE1)
		dbg->stats.roe1++;

	if (sisr & CCSR_SSI_SISR_ROE0)
		dbg->stats.roe0++;

	if (sisr & CCSR_SSI_SISR_TUE1)
		dbg->stats.tue1++;

	if (sisr & CCSR_SSI_SISR_TUE0)
		dbg->stats.tue0++;

	if (sisr & CCSR_SSI_SISR_TFS)
		dbg->stats.tfs++;

	if (sisr & CCSR_SSI_SISR_RFS)
		dbg->stats.rfs++;

	if (sisr & CCSR_SSI_SISR_TLS)
		dbg->stats.tls++;

	if (sisr & CCSR_SSI_SISR_RLS)
		dbg->stats.rls++;

	if (sisr & CCSR_SSI_SISR_RFF1)
		dbg->stats.rff1++;

	if (sisr & CCSR_SSI_SISR_RFF0)
		dbg->stats.rff0++;

	if (sisr & CCSR_SSI_SISR_TFE1)
		dbg->stats.tfe1++;

	if (sisr & CCSR_SSI_SISR_TFE0)
		dbg->stats.tfe0++;
}

/* Show the statistics of a flag only if its interrupt is enabled.  The
 * compiler will optimze this code to a no-op if the interrupt is not
 * enabled.
 */
#define SIER_SHOW(flag, name) \
	do { \
		if (CCSR_SSI_SIER_##flag) \
			seq_printf(s, #name "=%u\n", ssi_dbg->stats.name); \
	} while (0)


/**
 * fsl_sysfs_ssi_show: display SSI statistics
 *
 * Display the statistics for the current SSI device.  To avoid confusion,
 * we only show those counts that are enabled.
 */
static int fsl_ssi_stats_show(struct seq_file *s, void *unused)
{
	struct fsl_ssi_dbg *ssi_dbg = s->private;

	SIER_SHOW(RFRC_EN, rfrc);
	SIER_SHOW(TFRC_EN, tfrc);
	SIER_SHOW(CMDAU_EN, cmdau);
	SIER_SHOW(CMDDU_EN, cmddu);
	SIER_SHOW(RXT_EN, rxt);
	SIER_SHOW(RDR1_EN, rdr1);
	SIER_SHOW(RDR0_EN, rdr0);
	SIER_SHOW(TDE1_EN, tde1);
	SIER_SHOW(TDE0_EN, tde0);
	SIER_SHOW(ROE1_EN, roe1);
	SIER_SHOW(ROE0_EN, roe0);
	SIER_SHOW(TUE1_EN, tue1);
	SIER_SHOW(TUE0_EN, tue0);
	SIER_SHOW(TFS_EN, tfs);
	SIER_SHOW(RFS_EN, rfs);
	SIER_SHOW(TLS_EN, tls);
	SIER_SHOW(RLS_EN, rls);
	SIER_SHOW(RFF1_EN, rff1);
	SIER_SHOW(RFF0_EN, rff0);
	SIER_SHOW(TFE1_EN, tfe1);
	SIER_SHOW(TFE0_EN, tfe0);

	return 0;
}

static int fsl_ssi_stats_open(struct inode *inode, struct file *file)
{
	return single_open(file, fsl_ssi_stats_show, inode->i_private);
}

static const struct file_operations fsl_ssi_stats_ops = {
	.open = fsl_ssi_stats_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

int fsl_ssi_debugfs_create(struct fsl_ssi_dbg *ssi_dbg, struct device *dev)
{
	ssi_dbg->dbg_dir = debugfs_create_dir(dev_name(dev), NULL);
	if (!ssi_dbg->dbg_dir)
		return -ENOMEM;

	ssi_dbg->dbg_stats = debugfs_create_file("stats", S_IRUGO,
			ssi_dbg->dbg_dir, ssi_dbg, &fsl_ssi_stats_ops);
	if (!ssi_dbg->dbg_stats) {
		debugfs_remove(ssi_dbg->dbg_dir);
		return -ENOMEM;
	}

	return 0;
}

void fsl_ssi_debugfs_remove(struct fsl_ssi_dbg *ssi_dbg)
{
	debugfs_remove(ssi_dbg->dbg_stats);
	debugfs_remove(ssi_dbg->dbg_dir);
}
lue='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Dexuan Cui &lt;decui@microsoft.com&gt;</td><td class='right'>2017-01-28 11:46:02 -0700</td></tr>
<tr><th>committer</th><td>Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;</td><td class='right'>2017-01-31 10:59:48 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/pci/vx222?id=433e19cf33d34bb6751c874a9c00980552fe508c'>433e19cf33d34bb6751c874a9c00980552fe508c</a> (<a href='/cgit.cgi/linux/net-next.git/patch/sound/pci/vx222?id=433e19cf33d34bb6751c874a9c00980552fe508c'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=433e19cf33d34bb6751c874a9c00980552fe508c'>ce6547ef2987fbb289fa28f03536328a42781651</a> /<a href='/cgit.cgi/linux/net-next.git/tree/sound/pci/vx222?id=433e19cf33d34bb6751c874a9c00980552fe508c'>sound/pci/vx222</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/pci/vx222?id=191e885a2e130e639bb0c8ee350d7047294f2ce6'>191e885a2e130e639bb0c8ee350d7047294f2ce6</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound/pci/vx222?id=433e19cf33d34bb6751c874a9c00980552fe508c&amp;id2=191e885a2e130e639bb0c8ee350d7047294f2ce6'>diff</a>)</td></tr></table>
<div class='commit-subject'>Drivers: hv: vmbus: finally fix hv_need_to_signal_on_read()</div><div class='commit-msg'>Commit a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in
hv_need_to_signal_on_read()")
added the proper mb(), but removed the test "prev_write_sz &lt; pending_sz"
when making the signal decision.

As a result, the guest can signal the host unnecessarily,
and then the host can throttle the guest because the host
thinks the guest is buggy or malicious; finally the user
running stress test can perceive intermittent freeze of
the guest.

This patch brings back the test, and properly handles the
in-place consumption APIs used by NetVSC (see get_next_pkt_raw(),
put_pkt_raw() and commit_rd_index()).

Fixes: a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in
hv_need_to_signal_on_read()")

Signed-off-by: Dexuan Cui &lt;decui@microsoft.com&gt;
Reported-by: Rolf Neugebauer &lt;rolf.neugebauer@docker.com&gt;
Tested-by: Rolf Neugebauer &lt;rolf.neugebauer@docker.com&gt;
Cc: "K. Y. Srinivasan" &lt;kys@microsoft.com&gt;
Cc: Haiyang Zhang &lt;haiyangz@microsoft.com&gt;
Cc: Stephen Hemminger &lt;sthemmin@microsoft.com&gt;
Cc: &lt;stable@vger.kernel.org&gt;
Signed-off-by: K. Y. Srinivasan &lt;kys@microsoft.com&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=433e19cf33d34bb6751c874a9c00980552fe508c'>Diffstat</a> (limited to 'sound/pci/vx222')</div><table summary='diffstat' class='diffstat'>