drivers/s390/cio/chp.h

Source file repositories/reference/linux-study-clean/drivers/s390/cio/chp.h

File Facts

System
Linux kernel
Corpus path
drivers/s390/cio/chp.h
Extension
.h
Size
2008 bytes
Lines
79
Domain
Driver Families
Bucket
drivers/s390
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct chp_link {
	struct chp_id chpid;
	u32 fla_mask;
	u16 fla;
};

static inline int chp_test_bit(u8 *bitmap, int num)
{
	int byte = num >> 3;
	int mask = 128 >> (num & 7);

	return (bitmap[byte] & mask) ? 1 : 0;
}


struct channel_path {
	struct device dev;
	struct chp_id chpid;
	struct mutex lock; /* Serialize access to below members. */
	int state;
	struct channel_path_desc_fmt0 desc;
	struct channel_path_desc_fmt1 desc_fmt1;
	struct channel_path_desc_fmt3 desc_fmt3;
	/* Channel-measurement related stuff: */
	int cmg;
	int shared;
	int extended;
	unsigned long speed;
	struct cmg_chars cmg_chars;
	struct cmg_cmcb cmcb;
};

/* Return channel_path struct for given chpid. */
static inline struct channel_path *chpid_to_chp(struct chp_id chpid)
{
	return css_by_id(chpid.cssid)->chps[chpid.id];
}

int chp_get_status(struct chp_id chpid);
u8 chp_get_sch_opm(struct subchannel *sch);
int chp_is_registered(struct chp_id chpid);
struct channel_path_desc_fmt0 *chp_get_chp_desc(struct chp_id chpid);
void chp_remove_cmg_attr(struct channel_path *chp);
int chp_add_cmg_attr(struct channel_path *chp);
int chp_update_desc(struct channel_path *chp);
int chp_new(struct chp_id chpid);
void chp_cfg_schedule(struct chp_id chpid, int configure);
void chp_cfg_cancel_deconfigure(struct chp_id chpid);
int chp_info_get_status(struct chp_id chpid);
int chp_ssd_get_mask(struct chsc_ssd_info *, struct chp_link *);
#endif /* S390_CHP_H */

Annotation

Implementation Notes