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ata: start separating SATA specific code from libata-scsi.c

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Start separating SATA specific code from libata-scsi.c:

* un-static ata_scsi_find_dev()

* move following code to libata-sata.c:
  - SATA only sysfs device attributes handling
  - __ata_change_queue_depth()
  - ata_scsi_change_queue_depth()

* cover with CONFIG_SATA_HOST ifdef SATA only sysfs device
  attributes handling code and ATA_SHT_NCQ() macro in
  <linux/libata.h>

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

   text    data     bss     dec     hex filename
before:
  20702     105     576   21383    5387 drivers/ata/libata-scsi.o
after:
  19137      23     576   19736    4d18 drivers/ata/libata-scsi.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 16:58:18 +01:00 • committed by Jens Axboe
parent 2b384ede71
commit ec811a94c5
4 changed files with 308 additions and 302 deletions
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9
include/linux/libata.h
View file

@ -530,12 +530,14 @@ typedef int (*ata_reset_fn_t)(struct ata_link *link, unsigned int *classes,
unsigned long deadline);
typedef void (*ata_postreset_fn_t)(struct ata_link *link, unsigned int *classes);
extern struct device_attribute dev_attr_link_power_management_policy;
extern struct device_attribute dev_attr_unload_heads;
#ifdef CONFIG_SATA_HOST
extern struct device_attribute dev_attr_link_power_management_policy;
extern struct device_attribute dev_attr_ncq_prio_enable;
extern struct device_attribute dev_attr_em_message_type;
extern struct device_attribute dev_attr_em_message;
extern struct device_attribute dev_attr_sw_activity;
#endif
enum sw_activity {
OFF,
@ -1371,7 +1373,6 @@ extern int ata_link_nr_enabled(struct ata_link *link);
extern const struct ata_port_operations ata_base_port_ops;
extern const struct ata_port_operations sata_port_ops;
extern struct device_attribute *ata_common_sdev_attrs[];
extern struct device_attribute *ata_ncq_sdev_attrs[];
/*
* All sht initializers (BASE, PIO, BMDMA, NCQ) must be instantiated
@ -1399,10 +1400,14 @@ extern struct device_attribute *ata_ncq_sdev_attrs[];
__ATA_BASE_SHT(drv_name), \
.sdev_attrs = ata_common_sdev_attrs
#ifdef CONFIG_SATA_HOST
extern struct device_attribute *ata_ncq_sdev_attrs[];
#define ATA_NCQ_SHT(drv_name) \
__ATA_BASE_SHT(drv_name), \
.sdev_attrs = ata_ncq_sdev_attrs, \
.change_queue_depth = ata_scsi_change_queue_depth
#endif
/*
* PMP helpers