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firmware: cirrus: cs_dsp: Avoid padding bytes in cs_dsp_coeff_ctl

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Change the order of members in struct cs_dsp_coeff_ctl to avoid
the compiler having to insert alignment padding bytes. On a x86_64
build this saves 16 bytes per control.

- Pointers are collected to the top of the struct (with the exception of
  priv, as noted below), so that they are inherently aligned.
- The set and enable bitflags are placed together so they can be merged.
- priv is placed at the end of the struct - it is for use by the
  client so it is helpful to make it stand out, and since the compiler
  will always pad the struct size to an alignment multiple putting a
  pointer last won't introduce any more padding.
- struct cs_dsp_alg_region is placed at the end, right before priv, for
  the same reasoning as priv.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20220425095159.3044527-1-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Richard Fitzgerald 2022-04-25 10:51:59 +01:00 committed by Mark Brown
parent cc691ba94c
commit 430c350099
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GPG Key ID: 24D68B725D5487D0
1 changed files with 14 additions and 14 deletions
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28
include/linux/firmware/cirrus/cs_dsp.h
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@ -68,36 +68,36 @@ struct cs_dsp_alg_region {
/**
* struct cs_dsp_coeff_ctl - Describes a coefficient control
* @list: List node for internal use
* @dsp: DSP instance associated with this control
* @cache: Cached value of the control
* @fw_name: Name of the firmware
* @subname: Name of the control parsed from the WMFW
* @subname_len: Length of subname
* @alg_region: Logical region associated with this control
* @dsp: DSP instance associated with this control
* @enabled: Flag indicating whether control is enabled
* @list: List node for internal use
* @cache: Cached value of the control
* @offset: Offset of control within alg_region in words
* @len: Length of the cached value in bytes
* @set: Flag indicating the value has been written by the user
* @flags: Bitfield of WMFW_CTL_FLAG_ control flags defined in wmfw.h
* @type: One of the WMFW_CTL_TYPE_ control types defined in wmfw.h
* @flags: Bitfield of WMFW_CTL_FLAG_ control flags defined in wmfw.h
* @set: Flag indicating the value has been written by the user
* @enabled: Flag indicating whether control is enabled
* @alg_region: Logical region associated with this control
* @priv: For use by the client
*/
struct cs_dsp_coeff_ctl {
struct list_head list;
struct cs_dsp *dsp;
void *cache;
const char *fw_name;
/* Subname is needed to match with firmware */
const char *subname;
unsigned int subname_len;
struct cs_dsp_alg_region alg_region;
struct cs_dsp *dsp;
unsigned int enabled:1;
struct list_head list;
void *cache;
unsigned int offset;
size_t len;
unsigned int set:1;
unsigned int flags;
unsigned int type;
unsigned int flags;
unsigned int set:1;
unsigned int enabled:1;
struct cs_dsp_alg_region alg_region;
void *priv;
};