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Message-ID: <20240827130707.298477-5-yung-chuan.liao@linux.intel.com>
Date: Tue, 27 Aug 2024 21:06:57 +0800
From: Bard Liao <yung-chuan.liao@...ux.intel.com>
To: linux-sound@...r.kernel.org,
vkoul@...nel.org
Cc: vinod.koul@...aro.org,
linux-kernel@...r.kernel.org,
pierre-louis.bossart@...ux.intel.com,
bard.liao@...el.com
Subject: [PATCH 04/14] soundwire: optimize sdw_bus structure
From: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
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@...ux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@...ux.intel.com>
---
include/linux/soundwire/sdw.h | 79 ++++++++++++++++++-----------------
1 file changed, 41 insertions(+), 38 deletions(-)
diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h
index 2caea7345c3e..6fcf122c1831 100644
--- a/include/linux/soundwire/sdw.h
+++ b/include/linux/soundwire/sdw.h
@@ -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;
- 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 mutex bus_lock;
+ struct list_head slaves;
struct lock_class_key msg_lock_key;
- int (*compute_params)(struct sdw_bus *bus);
+ 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_bus_params params;
struct sdw_master_prop prop;
void *vendor_specific_prop;
- struct list_head m_rt_list;
-#ifdef CONFIG_DEBUG_FS
- struct dentry *debugfs;
-#endif
- struct irq_chip irq_chip;
- struct irq_domain *domain;
- struct sdw_defer defer_msg;
+ int hw_sync_min_links;
+ int controller_id;
+ unsigned int link_id;
+ int id;
+ int (*compute_params)(struct sdw_bus *bus);
+ 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
bool multi_link;
- int hw_sync_min_links;
- int stream_refcount;
};
int sdw_bus_master_add(struct sdw_bus *bus, struct device *parent,
--
2.43.0
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