/*
 * i2sbus driver -- private definitions
 *
 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
 *
 * GPL v2, can be found in COPYING.
 */
#ifndef __I2SBUS_H
#define __I2SBUS_H
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/completion.h>

#include <sound/pcm.h>

#include <asm/prom.h>
#include <asm/pmac_feature.h>
#include <asm/dbdma.h>

#include "interface.h"
#include "../soundbus.h"

struct i2sbus_control {
	struct list_head list;
	struct macio_chip *macio;
};

#define MAX_DBDMA_COMMANDS	32

struct dbdma_command_mem {
	dma_addr_t bus_addr;
	dma_addr_t bus_cmd_start;
	struct dbdma_cmd *cmds;
	void *space;
	int size;
	u32 running:1;
	u32 stopping:1;
};

struct pcm_info {
	u32 created:1, /* has this direction been created with alsa? */
	    active:1;  /* is this stream active? */
	/* runtime information */
	struct snd_pcm_substream *substream;
	int current_period;
	u32 frame_count;
	struct dbdma_command_mem dbdma_ring;
	volatile struct dbdma_regs __iomem *dbdma;
	struct completion *stop_completion;
};

enum {
	aoa_resource_i2smmio = 0,
	aoa_resource_txdbdma,
	aoa_resource_rxdbdma,
};

struct i2sbus_dev {
	struct soundbus_dev sound;
	struct macio_dev *macio;
	struct i2sbus_control *control;
	volatile struct i2s_interface_regs __iomem *intfregs;

	struct resource resources[3];
	struct resource *allocated_resource[3];
	int interrupts[3];
	char rnames[3][32];

	/* info about currently active substreams */
	struct pcm_info out, in;
	snd_pcm_format_t format;
	unsigned int rate;

	/* list for a single controller */
	struct list_head item;
	/* number of bus on controller */
	int bus_number;
	/* for use by control layer */
	struct pmf_function *enable,
			    *cell_enable,
			    *cell_disable,
			    *clock_enable,
			    *clock_disable;

	/* locks */
	/* spinlock for low-level interrupt locking */
	spinlock_t low_lock;
	/* mutex for high-level consistency */
	struct mutex lock;
};

#define soundbus_dev_to_i2sbus_dev(sdev) \
		container_of(sdev, struct i2sbus_dev, sound)

/* pcm specific functions */
extern int
i2sbus_attach_codec(struct soundbus_dev *dev, struct snd_card *card,
		    struct codec_info *ci, void *data);
extern void
i2sbus_detach_codec(struct soundbus_dev *dev, void *data);
extern irqreturn_t
i2sbus_tx_intr(int irq, void *devid);
extern irqreturn_t
i2sbus_rx_intr(int irq, void *devid);

extern void i2sbus_wait_for_stop_both(struct i2sbus_dev *i2sdev);
extern void i2sbus_pcm_prepare_both(struct i2sbus_dev *i2sdev);

/* control specific functions */
extern int i2sbus_control_init(struct macio_dev* dev,
			       struct i2sbus_control **c);
extern void i2sbus_control_destroy(struct i2sbus_control *c);
extern int i2sbus_control_add_dev(struct i2sbus_control *c,
				  struct i2sbus_dev *i2sdev);
extern void i2sbus_control_remove_dev(struct i2sbus_control *c,
				      struct i2sbus_dev *i2sdev);
extern int i2sbus_control_enable(struct i2sbus_control *c,
				 struct i2sbus_dev *i2sdev);
extern int i2sbus_control_cell(struct i2sbus_control *c,
			       struct i2sbus_dev *i2sdev,
			       int enable);
extern int i2sbus_control_clock(struct i2sbus_control *c,
				struct i2sbus_dev *i2sdev,
				int enable);
#endif /* __I2SBUS_H */
mp;id=e185934ff94466b4a449165e5f1c164a44d005f2'>sound</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/sound/ak4117.h?h=nds-private-remove&amp;id=e185934ff94466b4a449165e5f1c164a44d005f2'>ak4117.h</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='e185934ff94466b4a449165e5f1c164a44d005f2'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='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>Nicolai Stange &lt;nicstange@gmail.com&gt;</td><td class='right'>2016-12-07 22:21:33 +0100</td></tr>
<tr><th>committer</th><td>Tejun Heo &lt;tj@kernel.org&gt;</td><td class='right'>2016-12-07 16:29:09 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/sound/ak4117.h?h=nds-private-remove&amp;id=e185934ff94466b4a449165e5f1c164a44d005f2'>e185934ff94466b4a449165e5f1c164a44d005f2</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/sound/ak4117.h?id=e185934ff94466b4a449165e5f1c164a44d005f2'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=e185934ff94466b4a449165e5f1c164a44d005f2'>c773d05d4c72292e3babd4ce1a8bd56d965ebb4c</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/sound/ak4117.h?h=nds-private-remove&amp;id=e185934ff94466b4a449165e5f1c164a44d005f2'>include/sound/ak4117.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/sound/ak4117.h?h=nds-private-remove&amp;id=5c3ef39738f74a3759918cc1a1ad099504f9d1b7'>5c3ef39738f74a3759918cc1a1ad099504f9d1b7</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/sound/ak4117.h?h=nds-private-remove&amp;id=e185934ff94466b4a449165e5f1c164a44d005f2&amp;id2=5c3ef39738f74a3759918cc1a1ad099504f9d1b7'>diff</a>)</td></tr></table>
<div class='commit-subject'>libata-scsi: disable SCT Write Same for the moment</div><div class='commit-msg'>SCT Write Same support had been introduced with
commit 7b2030942859 ("libata: Add support for SCT Write Same")

Some problems, namely excessive userspace segfaults, had been reported at

  http://lkml.kernel.org/r/20160908192736.GA4356@gmail.com

This lead to commit 0ce1b18c42a5 ("libata: Some drives failing on
SCT Write Same") which strived to disable SCT Write Same on !ZAC devices.
Due to the way this was done and to the logic in sd_config_write_same(),
this didn't work for those devices that have
-&gt;max_ws_blocks &gt; SD_MAX_WS10_BLOCKS: for these, -&gt;no_write_same and
-&gt;max_write_same_sectors would still be non-zero,
but -&gt;ws10 == -&gt;ws16 == 0. This would cause sd_setup_write_same_cmnd() to
demultiplex REQ_OP_WRITE_SAME requests to WRITE_SAME, and these in turn
aren't supported by libata-scsi:

  EXT4-fs (dm-1): Delayed block allocation failed for inode 2625094 at
                  logical offset 2032 with max blocks 2 with error 121
  EXT4-fs (dm-1): This should not happen!! Data will be lost

121 == EREMOTEIO is what scsi_io_completion() asserts in case of
invalid opcodes.

Back to the original problem of userspace segfaults: this can be tracked
down to ata_format_sct_write_same() overwriting the input page. Sometimes,
this page is ZERO_PAGE(0) which ceases to be filled with zeros from that
point on. Since ZERO_PAGE(0) is used for userspace .bss mappings, code of
the following is doomed:

  static char *a = NULL; /* .bss */
  ...
  if (a)
    *a = 'a';

This problem is not solved by disabling SCT Write Same for !ZAC devices
only.

It can certainly be fixed, but the final release is quite close -- so
disable SCT Write Same for all ATA devices rather than introducing some
SCT key buffer allocation schemes at this point.

Fixes: 7b2030942859 ("libata: Add support for SCT Write Same")
Signed-off-by: Nicolai Stange &lt;nicstange@gmail.com&gt;
Signed-off-by: Tejun Heo &lt;tj@kernel.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=e185934ff94466b4a449165e5f1c164a44d005f2'>Diffstat</a> (limited to 'include/sound/ak4117.h')</div><table summary='diffstat' class='diffstat'>