mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-13 18:49:22 -04:00
Code Issues Packages Projects Releases Wiki Activity

soundwire: optimize sdw_bus structure

Browse Source 
The sdw_bus structure has seen multiple additions over the years. It's
one of the most used structures in this subsystem, so there's merit in
reshuffling the members a bit with 'pahole' to reduce holes and
structures across cache lines.

before:

struct sdw_bus {
	struct device *            dev;                  /*     0     8 */
	struct sdw_master_device * md;                   /*     8     8 */
	int                        controller_id;        /*    16     4 */
	unsigned int               link_id;              /*    20     4 */
	int                        id;                   /*    24     4 */

	/* XXX 4 bytes hole, try to pack */

	struct list_head           slaves;               /*    32    16 */
	long unsigned int          assigned[1];          /*    48     8 */
	struct mutex               bus_lock;             /*    56   160 */
	/* --- cacheline 3 boundary (192 bytes) was 24 bytes ago --- */
	struct lock_class_key      bus_lock_key;         /*   216    16 */
	struct mutex               msg_lock;             /*   232   160 */
	/* --- cacheline 6 boundary (384 bytes) was 8 bytes ago --- */
	struct lock_class_key      msg_lock_key;         /*   392    16 */
	int                        (*compute_params)(struct sdw_bus *); /*   408     8 */
	const struct sdw_master_ops  * ops;              /*   416     8 */
	const struct sdw_master_port_ops  * port_ops;    /*   424     8 */
	struct sdw_bus_params      params;               /*   432    36 */

	/* XXX 4 bytes hole, try to pack */

	/* --- cacheline 7 boundary (448 bytes) was 24 bytes ago --- */
	struct sdw_master_prop     prop;                 /*   472    72 */

	/* XXX last struct has 6 bytes of padding */

	/* --- cacheline 8 boundary (512 bytes) was 32 bytes ago --- */
	void *                     vendor_specific_prop; /*   544     8 */
	struct list_head           m_rt_list;            /*   552    16 */
	struct dentry *            debugfs;              /*   568     8 */
	/* --- cacheline 9 boundary (576 bytes) --- */
	struct irq_chip            irq_chip;             /*   576   264 */
	/* --- cacheline 13 boundary (832 bytes) was 8 bytes ago --- */
	struct irq_domain *        domain;               /*   840     8 */
	struct sdw_defer           defer_msg;            /*   848   112 */
	/* --- cacheline 15 boundary (960 bytes) --- */
	unsigned int               clk_stop_timeout;     /*   960     4 */
	u32                        bank_switch_timeout;  /*   964     4 */
	bool                       multi_link;           /*   968     1 */

	/* XXX 3 bytes hole, try to pack */

	int                        hw_sync_min_links;    /*   972     4 */
	int                        stream_refcount;      /*   976     4 */

	/* size: 984, cachelines: 16, members: 27 */
	/* sum members: 969, holes: 3, sum holes: 11 */
	/* padding: 4 */
	/* paddings: 1, sum paddings: 6 */
	/* last cacheline: 24 bytes */
};

after:

struct sdw_bus {
	struct device *            dev;                  /*     0     8 */
	struct sdw_master_device * md;                   /*     8     8 */
	struct lock_class_key      bus_lock_key;         /*    16    16 */
	struct mutex               bus_lock;             /*    32   160 */
	/* --- cacheline 3 boundary (192 bytes) --- */
	struct list_head           slaves;               /*   192    16 */
	struct lock_class_key      msg_lock_key;         /*   208    16 */
	struct mutex               msg_lock;             /*   224   160 */
	/* --- cacheline 6 boundary (384 bytes) --- */
	struct list_head           m_rt_list;            /*   384    16 */
	struct sdw_defer           defer_msg;            /*   400   112 */
	/* --- cacheline 8 boundary (512 bytes) --- */
	struct sdw_bus_params      params;               /*   512    36 */
	int                        stream_refcount;      /*   548     4 */
	const struct sdw_master_ops  * ops;              /*   552     8 */
	const struct sdw_master_port_ops  * port_ops;    /*   560     8 */
	struct sdw_master_prop     prop;                 /*   568    72 */

	/* XXX last struct has 6 bytes of padding */

	/* --- cacheline 10 boundary (640 bytes) --- */
	void *                     vendor_specific_prop; /*   640     8 */
	int                        hw_sync_min_links;    /*   648     4 */
	int                        controller_id;        /*   652     4 */
	unsigned int               link_id;              /*   656     4 */
	int                        id;                   /*   660     4 */
	int                        (*compute_params)(struct sdw_bus *); /*   664     8 */
	long unsigned int          assigned[1];          /*   672     8 */
	unsigned int               clk_stop_timeout;     /*   680     4 */
	u32                        bank_switch_timeout;  /*   684     4 */
	struct irq_chip            irq_chip;             /*   688   264 */
	/* --- cacheline 14 boundary (896 bytes) was 56 bytes ago --- */
	struct irq_domain *        domain;               /*   952     8 */
	/* --- cacheline 15 boundary (960 bytes) --- */
	struct dentry *            debugfs;              /*   960     8 */
	bool                       multi_link;           /*   968     1 */

	/* size: 976, cachelines: 16, members: 27 */
	/* padding: 7 */
	/* paddings: 1, sum paddings: 6 */
	/* last cacheline: 16 bytes */
};

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20241003070650.62787-5-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Pierre-Louis Bossart
2024-10-03 15:06:40 +08:00
committed by Vinod Koul
parent 6cb2c15643
commit 0a323dad1c
1 changed files with 42 additions and 39 deletions
Download Patch File Download Diff File Expand all files Collapse all files

81
include/linux/soundwire/sdw.h
View File

@@ -871,68 +871,71 @@ struct sdw_master_ops {
* struct sdw_bus - SoundWire bus
* @dev: Shortcut to &bus->md->dev to avoid changing the entire code.
* @md: Master device
* @controller_id: system-unique controller ID. If set to -1, the bus @id will be used.
* @link_id: Link id number, can be 0 to N, unique for each Controller
* @id: bus system-wide unique id
* @slaves: list of Slaves on this bus
* @assigned: Bitmap for Slave device numbers.
* Bit set implies used number, bit clear implies unused number.
* @bus_lock_key: bus lock key associated to @bus_lock
* @bus_lock: bus lock
* @slaves: list of Slaves on this bus
* @msg_lock_key: message lock key associated to @msg_lock
* @msg_lock: message lock
* @compute_params: points to Bus resource management implementation
* @ops: Master callback ops
* @port_ops: Master port callback ops
* @params: Current bus parameters
* @prop: Master properties
* @vendor_specific_prop: pointer to non-standard properties
* @m_rt_list: List of Master instance of all stream(s) running on Bus. This
* is used to compute and program bus bandwidth, clock, frame shape,
* transport and port parameters
* @debugfs: Bus debugfs
* @domain: IRQ domain
* @defer_msg: Defer message
* @clk_stop_timeout: Clock stop timeout computed
* @bank_switch_timeout: Bank switch timeout computed
* @multi_link: Store bus property that indicates if multi links
* are supported. This flag is populated by drivers after reading
* appropriate firmware (ACPI/DT).
* @params: Current bus parameters
* @stream_refcount: number of streams currently using this bus
* @ops: Master callback ops
* @port_ops: Master port callback ops
* @prop: Master properties
* @vendor_specific_prop: pointer to non-standard properties
* @hw_sync_min_links: Number of links used by a stream above which
* hardware-based synchronization is required. This value is only
* meaningful if multi_link is set. If set to 1, hardware-based
* synchronization will be used even if a stream only uses a single
* SoundWire segment.
* @stream_refcount: number of streams currently using this bus
* @controller_id: system-unique controller ID. If set to -1, the bus @id will be used.
* @link_id: Link id number, can be 0 to N, unique for each Controller
* @id: bus system-wide unique id
* @compute_params: points to Bus resource management implementation
* @assigned: Bitmap for Slave device numbers.
* Bit set implies used number, bit clear implies unused number.
* @clk_stop_timeout: Clock stop timeout computed
* @bank_switch_timeout: Bank switch timeout computed
* @domain: IRQ domain
* @irq_chip: IRQ chip
* @debugfs: Bus debugfs (optional)
* @multi_link: Store bus property that indicates if multi links
* are supported. This flag is populated by drivers after reading
* appropriate firmware (ACPI/DT).
*/
struct sdw_bus {
struct device *dev;
struct sdw_master_device *md;
struct lock_class_key bus_lock_key;
struct mutex bus_lock;
struct list_head slaves;
struct lock_class_key msg_lock_key;
struct mutex msg_lock;
struct list_head m_rt_list;
struct sdw_defer defer_msg;
struct sdw_bus_params params;
int stream_refcount;
const struct sdw_master_ops *ops;
const struct sdw_master_port_ops *port_ops;
struct sdw_master_prop prop;
void *vendor_specific_prop;
int hw_sync_min_links;
int controller_id;
unsigned int link_id;
int id;
struct list_head slaves;
DECLARE_BITMAP(assigned, SDW_MAX_DEVICES);
struct mutex bus_lock;
struct lock_class_key bus_lock_key;
struct mutex msg_lock;
struct lock_class_key msg_lock_key;
int (*compute_params)(struct sdw_bus *bus);
const struct sdw_master_ops *ops;
const struct sdw_master_port_ops *port_ops;
struct sdw_bus_params params;
struct sdw_master_prop prop;
void *vendor_specific_prop;
struct list_head m_rt_list;
DECLARE_BITMAP(assigned, SDW_MAX_DEVICES);
unsigned int clk_stop_timeout;
u32 bank_switch_timeout;
struct irq_chip irq_chip;
struct irq_domain *domain;
#ifdef CONFIG_DEBUG_FS
struct dentry *debugfs;
#endif
struct irq_chip irq_chip;
struct irq_domain *domain;
struct sdw_defer defer_msg;
unsigned int clk_stop_timeout;
u32 bank_switch_timeout;
bool multi_link;
int hw_sync_min_links;
int stream_refcount;
};
int sdw_bus_master_add(struct sdw_bus *bus, struct device *parent,