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ata: move *sata_set_spd*() to libata-sata.c 

* move *sata_set_spd*() to libata-sata.c

* add static inlines for CONFIG_SATA_HOST=n case

Code size savings on m68k arch using (modified) atari_defconfig:

   text    data     bss     dec     hex filename
before:
  32842     572      40   33458    82ae drivers/ata/libata-core.o
after:
  32812     572      40   33428    8290 drivers/ata/libata-core.o

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2020-03-26 16:58:13 +01:00 committed by Jens Axboe
parent 6eab1bc0ee
commit ab4117cf24
4 changed files with 90 additions and 82 deletions
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81
drivers/ata/libata-core.c
View File

@ -3050,87 +3050,6 @@ int sata_down_spd_limit(struct ata_link *link, u32 spd_limit)
return 0;
}
static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
{
struct ata_link *host_link = &link->ap->link;
u32 limit, target, spd;
limit = link->sata_spd_limit;
/* Don't configure downstream link faster than upstream link.
* It doesn't speed up anything and some PMPs choke on such
* configuration.
*/
if (!ata_is_host_link(link) && host_link->sata_spd)
limit &= (1 << host_link->sata_spd) - 1;
if (limit == UINT_MAX)
target = 0;
else
target = fls(limit);
spd = (*scontrol >> 4) & 0xf;
*scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
return spd != target;
}
/**
* sata_set_spd_needed - is SATA spd configuration needed
* @link: Link in question
*
* Test whether the spd limit in SControl matches
* @link->sata_spd_limit. This function is used to determine
* whether hardreset is necessary to apply SATA spd
* configuration.
*
* LOCKING:
* Inherited from caller.
*
* RETURNS:
* 1 if SATA spd configuration is needed, 0 otherwise.
*/
static int sata_set_spd_needed(struct ata_link *link)
{
u32 scontrol;
if (sata_scr_read(link, SCR_CONTROL, &scontrol))
return 1;
return __sata_set_spd_needed(link, &scontrol);
}
/**
* sata_set_spd - set SATA spd according to spd limit
* @link: Link to set SATA spd for
*
* Set SATA spd of @link according to sata_spd_limit.
*
* LOCKING:
* Inherited from caller.
*
* RETURNS:
* 0 if spd doesn't need to be changed, 1 if spd has been
* changed. Negative errno if SCR registers are inaccessible.
*/
int sata_set_spd(struct ata_link *link)
{
u32 scontrol;
int rc;
if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
return rc;
if (!__sata_set_spd_needed(link, &scontrol))
return 0;
if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
return rc;
return 1;
}
EXPORT_SYMBOL_GPL(sata_set_spd);
#ifdef CONFIG_ATA_ACPI
/**
* ata_timing_cycle2mode - find xfer mode for the specified cycle duration

81
drivers/ata/libata-sata.c
View File

@ -271,6 +271,87 @@ int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
}
EXPORT_SYMBOL_GPL(sata_link_scr_lpm);
static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
{
struct ata_link *host_link = &link->ap->link;
u32 limit, target, spd;
limit = link->sata_spd_limit;
/* Don't configure downstream link faster than upstream link.
* It doesn't speed up anything and some PMPs choke on such
* configuration.
*/
if (!ata_is_host_link(link) && host_link->sata_spd)
limit &= (1 << host_link->sata_spd) - 1;
if (limit == UINT_MAX)
target = 0;
else
target = fls(limit);
spd = (*scontrol >> 4) & 0xf;
*scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
return spd != target;
}
/**
* sata_set_spd_needed - is SATA spd configuration needed
* @link: Link in question
*
* Test whether the spd limit in SControl matches
* @link->sata_spd_limit. This function is used to determine
* whether hardreset is necessary to apply SATA spd
* configuration.
*
* LOCKING:
* Inherited from caller.
*
* RETURNS:
* 1 if SATA spd configuration is needed, 0 otherwise.
*/
int sata_set_spd_needed(struct ata_link *link)
{
u32 scontrol;
if (sata_scr_read(link, SCR_CONTROL, &scontrol))
return 1;
return __sata_set_spd_needed(link, &scontrol);
}
/**
* sata_set_spd - set SATA spd according to spd limit
* @link: Link to set SATA spd for
*
* Set SATA spd of @link according to sata_spd_limit.
*
* LOCKING:
* Inherited from caller.
*
* RETURNS:
* 0 if spd doesn't need to be changed, 1 if spd has been
* changed. Negative errno if SCR registers are inaccessible.
*/
int sata_set_spd(struct ata_link *link)
{
u32 scontrol;
int rc;
if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
return rc;
if (!__sata_set_spd_needed(link, &scontrol))
return 0;
if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
return rc;
return 1;
}
EXPORT_SYMBOL_GPL(sata_set_spd);
/**
* ata_slave_link_init - initialize slave link
* @ap: port to initialize slave link for

7
drivers/ata/libata.h
View File

@ -87,6 +87,13 @@ extern unsigned int ata_read_log_page(struct ata_device *dev, u8 log,
#define to_ata_port(d) container_of(d, struct ata_port, tdev)
/* libata-sata.c */
#ifdef CONFIG_SATA_HOST
int sata_set_spd_needed(struct ata_link *link);
#else
static inline int sata_set_spd_needed(struct ata_link *link) { return 1; }
#endif
/* libata-acpi.c */
#ifdef CONFIG_ATA_ACPI
extern unsigned int ata_acpi_gtf_filter;

3
include/linux/libata.h
View File

@ -1074,7 +1074,6 @@ static inline int ata_port_is_dummy(struct ata_port *ap)
return ap->ops == &ata_dummy_port_ops;
}
extern int sata_set_spd(struct ata_link *link);
extern int ata_std_prereset(struct ata_link *link, unsigned long deadline);
extern int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
int (*check_ready)(struct ata_link *link));
@ -1194,6 +1193,7 @@ extern int sata_scr_valid(struct ata_link *link);
extern int sata_scr_read(struct ata_link *link, int reg, u32 *val);
extern int sata_scr_write(struct ata_link *link, int reg, u32 val);
extern int sata_scr_write_flush(struct ata_link *link, int reg, u32 val);
extern int sata_set_spd(struct ata_link *link);
#else
static inline int sata_scr_valid(struct ata_link *link) { return 0; }
static inline int sata_scr_read(struct ata_link *link, int reg, u32 *val)
@ -1208,6 +1208,7 @@ static inline int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
{
return -EOPNOTSUPP;
}
static inline int sata_set_spd(struct ata_link *link) { return -EOPNOTSUPP; }
#endif
extern int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
bool spm_wakeup);