c3aeda6287
Although some races in runtime PM refcount was fixed by the commit
[664c715573: ALSA: hda - Work around races of power up/down with
runtime PM], there is still a race in the following case:
CPU0: CPU1 :
runtime suspend:
codec->in_pm = 1
snd_hdac_power_up_pm():
pm_runtime_get_sync() skipped
suspend finished:
codec->in_pm = 0
snd_hdac_power_down_pm():
pm_runtime_put_*() is called!
For avoiding this situation, increment in_pm flag atomically when it's
non-zero, and decrement accordingly, to ensure that in_pm is set
consistently for the whole concurrent operations.
Also, since atomic_inc_not_zero() and atomic_dec_if_positive() are
lengthy inline functions, move snd_hdac_power_up_pm() and _down_pm()
to sound/hda/hdac_device.c as no inline functions.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
248 lines
6.6 KiB
C
248 lines
6.6 KiB
C
/*
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* HD-audio core stuff
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*/
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#ifndef __SOUND_HDAUDIO_H
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#define __SOUND_HDAUDIO_H
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#include <linux/device.h>
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#include <sound/hda_verbs.h>
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/* codec node id */
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typedef u16 hda_nid_t;
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struct hdac_bus;
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struct hdac_device;
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struct hdac_driver;
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struct hdac_widget_tree;
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/*
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* exported bus type
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*/
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extern struct bus_type snd_hda_bus_type;
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/*
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* generic arrays
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*/
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struct snd_array {
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unsigned int used;
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unsigned int alloced;
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unsigned int elem_size;
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unsigned int alloc_align;
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void *list;
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};
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/*
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* HD-audio codec base device
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*/
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struct hdac_device {
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struct device dev;
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int type;
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struct hdac_bus *bus;
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unsigned int addr; /* codec address */
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struct list_head list; /* list point for bus codec_list */
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hda_nid_t afg; /* AFG node id */
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hda_nid_t mfg; /* MFG node id */
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/* ids */
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unsigned int vendor_id;
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unsigned int subsystem_id;
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unsigned int revision_id;
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unsigned int afg_function_id;
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unsigned int mfg_function_id;
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unsigned int afg_unsol:1;
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unsigned int mfg_unsol:1;
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unsigned int power_caps; /* FG power caps */
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const char *vendor_name; /* codec vendor name */
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const char *chip_name; /* codec chip name */
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/* verb exec op override */
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int (*exec_verb)(struct hdac_device *dev, unsigned int cmd,
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unsigned int flags, unsigned int *res);
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/* widgets */
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unsigned int num_nodes;
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hda_nid_t start_nid, end_nid;
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/* misc flags */
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atomic_t in_pm; /* suspend/resume being performed */
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/* sysfs */
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struct hdac_widget_tree *widgets;
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/* regmap */
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struct regmap *regmap;
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struct snd_array vendor_verbs;
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bool lazy_cache:1; /* don't wake up for writes */
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bool caps_overwriting:1; /* caps overwrite being in process */
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bool cache_coef:1; /* cache COEF read/write too */
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};
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/* device/driver type used for matching */
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enum {
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HDA_DEV_CORE,
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HDA_DEV_LEGACY,
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};
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/* direction */
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enum {
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HDA_INPUT, HDA_OUTPUT
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};
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#define dev_to_hdac_dev(_dev) container_of(_dev, struct hdac_device, dev)
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int snd_hdac_device_init(struct hdac_device *dev, struct hdac_bus *bus,
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const char *name, unsigned int addr);
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void snd_hdac_device_exit(struct hdac_device *dev);
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int snd_hdac_device_register(struct hdac_device *codec);
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void snd_hdac_device_unregister(struct hdac_device *codec);
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int snd_hdac_refresh_widgets(struct hdac_device *codec);
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unsigned int snd_hdac_make_cmd(struct hdac_device *codec, hda_nid_t nid,
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unsigned int verb, unsigned int parm);
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int snd_hdac_exec_verb(struct hdac_device *codec, unsigned int cmd,
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unsigned int flags, unsigned int *res);
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int snd_hdac_read(struct hdac_device *codec, hda_nid_t nid,
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unsigned int verb, unsigned int parm, unsigned int *res);
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int _snd_hdac_read_parm(struct hdac_device *codec, hda_nid_t nid, int parm,
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unsigned int *res);
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int snd_hdac_read_parm_uncached(struct hdac_device *codec, hda_nid_t nid,
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int parm);
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int snd_hdac_override_parm(struct hdac_device *codec, hda_nid_t nid,
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unsigned int parm, unsigned int val);
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int snd_hdac_get_connections(struct hdac_device *codec, hda_nid_t nid,
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hda_nid_t *conn_list, int max_conns);
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int snd_hdac_get_sub_nodes(struct hdac_device *codec, hda_nid_t nid,
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hda_nid_t *start_id);
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/**
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* snd_hdac_read_parm - read a codec parameter
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* @codec: the codec object
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* @nid: NID to read a parameter
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* @parm: parameter to read
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*
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* Returns -1 for error. If you need to distinguish the error more
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* strictly, use _snd_hdac_read_parm() directly.
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*/
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static inline int snd_hdac_read_parm(struct hdac_device *codec, hda_nid_t nid,
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int parm)
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{
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unsigned int val;
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return _snd_hdac_read_parm(codec, nid, parm, &val) < 0 ? -1 : val;
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}
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#ifdef CONFIG_PM
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void snd_hdac_power_up(struct hdac_device *codec);
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void snd_hdac_power_down(struct hdac_device *codec);
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void snd_hdac_power_up_pm(struct hdac_device *codec);
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void snd_hdac_power_down_pm(struct hdac_device *codec);
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#else
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static inline void snd_hdac_power_up(struct hdac_device *codec) {}
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static inline void snd_hdac_power_down(struct hdac_device *codec) {}
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static inline void snd_hdac_power_up_pm(struct hdac_device *codec) {}
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static inline void snd_hdac_power_down_pm(struct hdac_device *codec) {}
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#endif
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/*
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* HD-audio codec base driver
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*/
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struct hdac_driver {
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struct device_driver driver;
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int type;
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int (*match)(struct hdac_device *dev, struct hdac_driver *drv);
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void (*unsol_event)(struct hdac_device *dev, unsigned int event);
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};
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#define drv_to_hdac_driver(_drv) container_of(_drv, struct hdac_driver, driver)
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/*
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* HD-audio bus base driver
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*/
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struct hdac_bus_ops {
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/* send a single command */
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int (*command)(struct hdac_bus *bus, unsigned int cmd);
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/* get a response from the last command */
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int (*get_response)(struct hdac_bus *bus, unsigned int addr,
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unsigned int *res);
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};
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#define HDA_UNSOL_QUEUE_SIZE 64
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struct hdac_bus {
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struct device *dev;
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const struct hdac_bus_ops *ops;
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/* codec linked list */
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struct list_head codec_list;
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unsigned int num_codecs;
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/* link caddr -> codec */
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struct hdac_device *caddr_tbl[HDA_MAX_CODEC_ADDRESS + 1];
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/* unsolicited event queue */
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u32 unsol_queue[HDA_UNSOL_QUEUE_SIZE * 2]; /* ring buffer */
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unsigned int unsol_rp, unsol_wp;
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struct work_struct unsol_work;
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/* bit flags of powered codecs */
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unsigned long codec_powered;
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/* flags */
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bool sync_write:1; /* sync after verb write */
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/* locks */
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struct mutex cmd_mutex;
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};
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int snd_hdac_bus_init(struct hdac_bus *bus, struct device *dev,
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const struct hdac_bus_ops *ops);
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void snd_hdac_bus_exit(struct hdac_bus *bus);
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int snd_hdac_bus_exec_verb(struct hdac_bus *bus, unsigned int addr,
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unsigned int cmd, unsigned int *res);
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int snd_hdac_bus_exec_verb_unlocked(struct hdac_bus *bus, unsigned int addr,
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unsigned int cmd, unsigned int *res);
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void snd_hdac_bus_queue_event(struct hdac_bus *bus, u32 res, u32 res_ex);
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int snd_hdac_bus_add_device(struct hdac_bus *bus, struct hdac_device *codec);
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void snd_hdac_bus_remove_device(struct hdac_bus *bus,
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struct hdac_device *codec);
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static inline void snd_hdac_codec_link_up(struct hdac_device *codec)
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{
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set_bit(codec->addr, &codec->bus->codec_powered);
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}
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static inline void snd_hdac_codec_link_down(struct hdac_device *codec)
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{
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clear_bit(codec->addr, &codec->bus->codec_powered);
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}
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/*
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* generic array helpers
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*/
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void *snd_array_new(struct snd_array *array);
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void snd_array_free(struct snd_array *array);
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static inline void snd_array_init(struct snd_array *array, unsigned int size,
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unsigned int align)
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{
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array->elem_size = size;
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array->alloc_align = align;
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}
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static inline void *snd_array_elem(struct snd_array *array, unsigned int idx)
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{
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return array->list + idx * array->elem_size;
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}
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static inline unsigned int snd_array_index(struct snd_array *array, void *ptr)
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{
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return (unsigned long)(ptr - array->list) / array->elem_size;
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}
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#endif /* __SOUND_HDAUDIO_H */
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