ata: start separating SATA specific code from libata-core.c
Start separating SATA specific code from libata-core.c: * move following functions to libata-sata.c: - ata_tf_to_fis() - ata_tf_from_fis() - sata_link_scr_lpm() - ata_slave_link_init() - sata_lpm_ignore_phy_events() * group above functions together in <linux/libata.h> * include libata-sata.c in the build when CONFIG_SATA_HOST=y Code size savings on m68k arch using (modified) atari_defconfig: text data bss dec hex filename before: 37582 572 40 38194 9532 drivers/ata/libata-core.o after: 36762 572 40 37374 91fe 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
Jens Axboe
Родитель
4c9029e7d0
Коммит
7fe183c773
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@ -123,6 +123,7 @@ obj-$(CONFIG_PATA_LEGACY) += pata_legacy.o
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libata-y := libata-core.o libata-scsi.o libata-eh.o \
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libata-transport.o libata-trace.o
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libata-$(CONFIG_SATA_HOST) += libata-sata.o
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libata-$(CONFIG_ATA_SFF) += libata-sff.o
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libata-$(CONFIG_SATA_PMP) += libata-pmp.o
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libata-$(CONFIG_ATA_ACPI) += libata-acpi.o
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@ -531,81 +531,6 @@ int atapi_cmd_type(u8 opcode)
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}
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EXPORT_SYMBOL_GPL(atapi_cmd_type);
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/**
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* ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
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* @tf: Taskfile to convert
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* @pmp: Port multiplier port
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* @is_cmd: This FIS is for command
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* @fis: Buffer into which data will output
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*
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* Converts a standard ATA taskfile to a Serial ATA
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* FIS structure (Register - Host to Device).
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*
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* LOCKING:
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* Inherited from caller.
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*/
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void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
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{
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fis[0] = 0x27; /* Register - Host to Device FIS */
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fis[1] = pmp & 0xf; /* Port multiplier number*/
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if (is_cmd)
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fis[1] |= (1 << 7); /* bit 7 indicates Command FIS */
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fis[2] = tf->command;
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fis[3] = tf->feature;
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fis[4] = tf->lbal;
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fis[5] = tf->lbam;
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fis[6] = tf->lbah;
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fis[7] = tf->device;
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fis[8] = tf->hob_lbal;
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fis[9] = tf->hob_lbam;
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fis[10] = tf->hob_lbah;
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fis[11] = tf->hob_feature;
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fis[12] = tf->nsect;
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fis[13] = tf->hob_nsect;
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fis[14] = 0;
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fis[15] = tf->ctl;
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fis[16] = tf->auxiliary & 0xff;
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fis[17] = (tf->auxiliary >> 8) & 0xff;
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fis[18] = (tf->auxiliary >> 16) & 0xff;
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fis[19] = (tf->auxiliary >> 24) & 0xff;
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}
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EXPORT_SYMBOL_GPL(ata_tf_to_fis);
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/**
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* ata_tf_from_fis - Convert SATA FIS to ATA taskfile
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* @fis: Buffer from which data will be input
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* @tf: Taskfile to output
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*
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* Converts a serial ATA FIS structure to a standard ATA taskfile.
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*
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* LOCKING:
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* Inherited from caller.
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*/
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void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
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{
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tf->command = fis[2]; /* status */
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tf->feature = fis[3]; /* error */
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tf->lbal = fis[4];
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tf->lbam = fis[5];
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tf->lbah = fis[6];
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tf->device = fis[7];
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tf->hob_lbal = fis[8];
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tf->hob_lbam = fis[9];
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tf->hob_lbah = fis[10];
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tf->nsect = fis[12];
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tf->hob_nsect = fis[13];
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}
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EXPORT_SYMBOL_GPL(ata_tf_from_fis);
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static const u8 ata_rw_cmds[] = {
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/* pio multi */
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ATA_CMD_READ_MULTI,
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@ -3779,81 +3704,6 @@ int sata_link_resume(struct ata_link *link, const unsigned long *params,
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}
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EXPORT_SYMBOL_GPL(sata_link_resume);
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/**
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* sata_link_scr_lpm - manipulate SControl IPM and SPM fields
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* @link: ATA link to manipulate SControl for
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* @policy: LPM policy to configure
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* @spm_wakeup: initiate LPM transition to active state
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*
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* Manipulate the IPM field of the SControl register of @link
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* according to @policy. If @policy is ATA_LPM_MAX_POWER and
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* @spm_wakeup is %true, the SPM field is manipulated to wake up
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* the link. This function also clears PHYRDY_CHG before
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* returning.
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*
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* LOCKING:
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* EH context.
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*
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* RETURNS:
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* 0 on success, -errno otherwise.
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*/
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int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
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bool spm_wakeup)
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{
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struct ata_eh_context *ehc = &link->eh_context;
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bool woken_up = false;
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u32 scontrol;
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int rc;
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rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
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if (rc)
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return rc;
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switch (policy) {
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case ATA_LPM_MAX_POWER:
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/* disable all LPM transitions */
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scontrol |= (0x7 << 8);
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/* initiate transition to active state */
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if (spm_wakeup) {
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scontrol |= (0x4 << 12);
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woken_up = true;
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}
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break;
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case ATA_LPM_MED_POWER:
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/* allow LPM to PARTIAL */
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scontrol &= ~(0x1 << 8);
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scontrol |= (0x6 << 8);
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break;
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case ATA_LPM_MED_POWER_WITH_DIPM:
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case ATA_LPM_MIN_POWER_WITH_PARTIAL:
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case ATA_LPM_MIN_POWER:
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if (ata_link_nr_enabled(link) > 0)
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/* no restrictions on LPM transitions */
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scontrol &= ~(0x7 << 8);
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else {
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/* empty port, power off */
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scontrol &= ~0xf;
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scontrol |= (0x1 << 2);
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}
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break;
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default:
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WARN_ON(1);
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}
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rc = sata_scr_write(link, SCR_CONTROL, scontrol);
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if (rc)
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return rc;
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/* give the link time to transit out of LPM state */
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if (woken_up)
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msleep(10);
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/* clear PHYRDY_CHG from SError */
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ehc->i.serror &= ~SERR_PHYRDY_CHG;
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return sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
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}
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EXPORT_SYMBOL_GPL(sata_link_scr_lpm);
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/**
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* ata_std_prereset - prepare for reset
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* @link: ATA link to be reset
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@ -6118,69 +5968,6 @@ struct ata_host *ata_host_alloc_pinfo(struct device *dev,
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}
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EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
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/**
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* ata_slave_link_init - initialize slave link
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* @ap: port to initialize slave link for
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*
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* Create and initialize slave link for @ap. This enables slave
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* link handling on the port.
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*
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* In libata, a port contains links and a link contains devices.
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* There is single host link but if a PMP is attached to it,
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* there can be multiple fan-out links. On SATA, there's usually
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* a single device connected to a link but PATA and SATA
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* controllers emulating TF based interface can have two - master
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* and slave.
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*
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* However, there are a few controllers which don't fit into this
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* abstraction too well - SATA controllers which emulate TF
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* interface with both master and slave devices but also have
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* separate SCR register sets for each device. These controllers
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* need separate links for physical link handling
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* (e.g. onlineness, link speed) but should be treated like a
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* traditional M/S controller for everything else (e.g. command
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* issue, softreset).
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*
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* slave_link is libata's way of handling this class of
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* controllers without impacting core layer too much. For
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* anything other than physical link handling, the default host
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* link is used for both master and slave. For physical link
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* handling, separate @ap->slave_link is used. All dirty details
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* are implemented inside libata core layer. From LLD's POV, the
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* only difference is that prereset, hardreset and postreset are
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* called once more for the slave link, so the reset sequence
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* looks like the following.
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*
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* prereset(M) -> prereset(S) -> hardreset(M) -> hardreset(S) ->
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* softreset(M) -> postreset(M) -> postreset(S)
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*
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* Note that softreset is called only for the master. Softreset
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* resets both M/S by definition, so SRST on master should handle
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* both (the standard method will work just fine).
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*
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* LOCKING:
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* Should be called before host is registered.
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*
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* RETURNS:
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* 0 on success, -errno on failure.
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*/
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int ata_slave_link_init(struct ata_port *ap)
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{
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struct ata_link *link;
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WARN_ON(ap->slave_link);
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WARN_ON(ap->flags & ATA_FLAG_PMP);
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link = kzalloc(sizeof(*link), GFP_KERNEL);
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if (!link)
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return -ENOMEM;
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ata_link_init(ap, link, 1);
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ap->slave_link = link;
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return 0;
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}
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EXPORT_SYMBOL_GPL(ata_slave_link_init);
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static void ata_host_stop(struct device *gendev, void *res)
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{
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struct ata_host *host = dev_get_drvdata(gendev);
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@ -7106,38 +6893,6 @@ u32 ata_wait_register(struct ata_port *ap, void __iomem *reg, u32 mask, u32 val,
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}
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EXPORT_SYMBOL_GPL(ata_wait_register);
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/**
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* sata_lpm_ignore_phy_events - test if PHY event should be ignored
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* @link: Link receiving the event
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*
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* Test whether the received PHY event has to be ignored or not.
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*
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* LOCKING:
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* None:
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*
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* RETURNS:
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* True if the event has to be ignored.
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*/
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bool sata_lpm_ignore_phy_events(struct ata_link *link)
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{
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unsigned long lpm_timeout = link->last_lpm_change +
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msecs_to_jiffies(ATA_TMOUT_SPURIOUS_PHY);
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/* if LPM is enabled, PHYRDY doesn't mean anything */
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if (link->lpm_policy > ATA_LPM_MAX_POWER)
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return true;
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/* ignore the first PHY event after the LPM policy changed
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* as it is might be spurious
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*/
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if ((link->flags & ATA_LFLAG_CHANGED) &&
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time_before(jiffies, lpm_timeout))
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return true;
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return false;
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}
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EXPORT_SYMBOL_GPL(sata_lpm_ignore_phy_events);
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/*
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* Dummy port_ops
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*/
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@ -0,0 +1,258 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* SATA specific part of ATA helper library
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*
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* Copyright 2003-2004 Red Hat, Inc. All rights reserved.
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* Copyright 2003-2004 Jeff Garzik
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/libata.h>
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#include "libata.h"
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/**
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* ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
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* @tf: Taskfile to convert
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* @pmp: Port multiplier port
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* @is_cmd: This FIS is for command
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* @fis: Buffer into which data will output
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*
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* Converts a standard ATA taskfile to a Serial ATA
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* FIS structure (Register - Host to Device).
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*
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* LOCKING:
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* Inherited from caller.
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*/
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void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
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{
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fis[0] = 0x27; /* Register - Host to Device FIS */
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fis[1] = pmp & 0xf; /* Port multiplier number*/
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if (is_cmd)
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fis[1] |= (1 << 7); /* bit 7 indicates Command FIS */
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fis[2] = tf->command;
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fis[3] = tf->feature;
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fis[4] = tf->lbal;
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fis[5] = tf->lbam;
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fis[6] = tf->lbah;
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fis[7] = tf->device;
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fis[8] = tf->hob_lbal;
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fis[9] = tf->hob_lbam;
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fis[10] = tf->hob_lbah;
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fis[11] = tf->hob_feature;
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fis[12] = tf->nsect;
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fis[13] = tf->hob_nsect;
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fis[14] = 0;
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fis[15] = tf->ctl;
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fis[16] = tf->auxiliary & 0xff;
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fis[17] = (tf->auxiliary >> 8) & 0xff;
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fis[18] = (tf->auxiliary >> 16) & 0xff;
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fis[19] = (tf->auxiliary >> 24) & 0xff;
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}
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EXPORT_SYMBOL_GPL(ata_tf_to_fis);
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/**
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* ata_tf_from_fis - Convert SATA FIS to ATA taskfile
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* @fis: Buffer from which data will be input
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* @tf: Taskfile to output
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*
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* Converts a serial ATA FIS structure to a standard ATA taskfile.
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*
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* LOCKING:
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* Inherited from caller.
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*/
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void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
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{
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tf->command = fis[2]; /* status */
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tf->feature = fis[3]; /* error */
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tf->lbal = fis[4];
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tf->lbam = fis[5];
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tf->lbah = fis[6];
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tf->device = fis[7];
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tf->hob_lbal = fis[8];
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tf->hob_lbam = fis[9];
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tf->hob_lbah = fis[10];
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tf->nsect = fis[12];
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tf->hob_nsect = fis[13];
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}
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EXPORT_SYMBOL_GPL(ata_tf_from_fis);
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/**
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* sata_link_scr_lpm - manipulate SControl IPM and SPM fields
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* @link: ATA link to manipulate SControl for
|
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* @policy: LPM policy to configure
|
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* @spm_wakeup: initiate LPM transition to active state
|
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*
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* Manipulate the IPM field of the SControl register of @link
|
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* according to @policy. If @policy is ATA_LPM_MAX_POWER and
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* @spm_wakeup is %true, the SPM field is manipulated to wake up
|
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* the link. This function also clears PHYRDY_CHG before
|
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* returning.
|
||||
*
|
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* LOCKING:
|
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* EH context.
|
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*
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* RETURNS:
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* 0 on success, -errno otherwise.
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*/
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int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
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bool spm_wakeup)
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{
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struct ata_eh_context *ehc = &link->eh_context;
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bool woken_up = false;
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u32 scontrol;
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int rc;
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rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
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if (rc)
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return rc;
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switch (policy) {
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case ATA_LPM_MAX_POWER:
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/* disable all LPM transitions */
|
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scontrol |= (0x7 << 8);
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/* initiate transition to active state */
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if (spm_wakeup) {
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scontrol |= (0x4 << 12);
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woken_up = true;
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}
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break;
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case ATA_LPM_MED_POWER:
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/* allow LPM to PARTIAL */
|
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scontrol &= ~(0x1 << 8);
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scontrol |= (0x6 << 8);
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break;
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case ATA_LPM_MED_POWER_WITH_DIPM:
|
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case ATA_LPM_MIN_POWER_WITH_PARTIAL:
|
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case ATA_LPM_MIN_POWER:
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if (ata_link_nr_enabled(link) > 0)
|
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/* no restrictions on LPM transitions */
|
||||
scontrol &= ~(0x7 << 8);
|
||||
else {
|
||||
/* empty port, power off */
|
||||
scontrol &= ~0xf;
|
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scontrol |= (0x1 << 2);
|
||||
}
|
||||
break;
|
||||
default:
|
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WARN_ON(1);
|
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}
|
||||
|
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rc = sata_scr_write(link, SCR_CONTROL, scontrol);
|
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if (rc)
|
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return rc;
|
||||
|
||||
/* give the link time to transit out of LPM state */
|
||||
if (woken_up)
|
||||
msleep(10);
|
||||
|
||||
/* clear PHYRDY_CHG from SError */
|
||||
ehc->i.serror &= ~SERR_PHYRDY_CHG;
|
||||
return sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(sata_link_scr_lpm);
|
||||
|
||||
/**
|
||||
* ata_slave_link_init - initialize slave link
|
||||
* @ap: port to initialize slave link for
|
||||
*
|
||||
* Create and initialize slave link for @ap. This enables slave
|
||||
* link handling on the port.
|
||||
*
|
||||
* In libata, a port contains links and a link contains devices.
|
||||
* There is single host link but if a PMP is attached to it,
|
||||
* there can be multiple fan-out links. On SATA, there's usually
|
||||
* a single device connected to a link but PATA and SATA
|
||||
* controllers emulating TF based interface can have two - master
|
||||
* and slave.
|
||||
*
|
||||
* However, there are a few controllers which don't fit into this
|
||||
* abstraction too well - SATA controllers which emulate TF
|
||||
* interface with both master and slave devices but also have
|
||||
* separate SCR register sets for each device. These controllers
|
||||
* need separate links for physical link handling
|
||||
* (e.g. onlineness, link speed) but should be treated like a
|
||||
* traditional M/S controller for everything else (e.g. command
|
||||
* issue, softreset).
|
||||
*
|
||||
* slave_link is libata's way of handling this class of
|
||||
* controllers without impacting core layer too much. For
|
||||
* anything other than physical link handling, the default host
|
||||
* link is used for both master and slave. For physical link
|
||||
* handling, separate @ap->slave_link is used. All dirty details
|
||||
* are implemented inside libata core layer. From LLD's POV, the
|
||||
* only difference is that prereset, hardreset and postreset are
|
||||
* called once more for the slave link, so the reset sequence
|
||||
* looks like the following.
|
||||
*
|
||||
* prereset(M) -> prereset(S) -> hardreset(M) -> hardreset(S) ->
|
||||
* softreset(M) -> postreset(M) -> postreset(S)
|
||||
*
|
||||
* Note that softreset is called only for the master. Softreset
|
||||
* resets both M/S by definition, so SRST on master should handle
|
||||
* both (the standard method will work just fine).
|
||||
*
|
||||
* LOCKING:
|
||||
* Should be called before host is registered.
|
||||
*
|
||||
* RETURNS:
|
||||
* 0 on success, -errno on failure.
|
||||
*/
|
||||
int ata_slave_link_init(struct ata_port *ap)
|
||||
{
|
||||
struct ata_link *link;
|
||||
|
||||
WARN_ON(ap->slave_link);
|
||||
WARN_ON(ap->flags & ATA_FLAG_PMP);
|
||||
|
||||
link = kzalloc(sizeof(*link), GFP_KERNEL);
|
||||
if (!link)
|
||||
return -ENOMEM;
|
||||
|
||||
ata_link_init(ap, link, 1);
|
||||
ap->slave_link = link;
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ata_slave_link_init);
|
||||
|
||||
/**
|
||||
* sata_lpm_ignore_phy_events - test if PHY event should be ignored
|
||||
* @link: Link receiving the event
|
||||
*
|
||||
* Test whether the received PHY event has to be ignored or not.
|
||||
*
|
||||
* LOCKING:
|
||||
* None:
|
||||
*
|
||||
* RETURNS:
|
||||
* True if the event has to be ignored.
|
||||
*/
|
||||
bool sata_lpm_ignore_phy_events(struct ata_link *link)
|
||||
{
|
||||
unsigned long lpm_timeout = link->last_lpm_change +
|
||||
msecs_to_jiffies(ATA_TMOUT_SPURIOUS_PHY);
|
||||
|
||||
/* if LPM is enabled, PHYRDY doesn't mean anything */
|
||||
if (link->lpm_policy > ATA_LPM_MAX_POWER)
|
||||
return true;
|
||||
|
||||
/* ignore the first PHY event after the LPM policy changed
|
||||
* as it is might be spurious
|
||||
*/
|
||||
if ((link->flags & ATA_LFLAG_CHANGED) &&
|
||||
time_before(jiffies, lpm_timeout))
|
||||
return true;
|
||||
|
||||
return false;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(sata_lpm_ignore_phy_events);
|
||||
|
|
@ -1082,8 +1082,6 @@ extern int sata_link_debounce(struct ata_link *link,
|
|||
const unsigned long *params, unsigned long deadline);
|
||||
extern int sata_link_resume(struct ata_link *link, const unsigned long *params,
|
||||
unsigned long deadline);
|
||||
extern int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
|
||||
bool spm_wakeup);
|
||||
extern int sata_link_hardreset(struct ata_link *link,
|
||||
const unsigned long *timing, unsigned long deadline,
|
||||
bool *online, int (*check_ready)(struct ata_link *));
|
||||
|
|
@ -1094,7 +1092,6 @@ extern void ata_std_postreset(struct ata_link *link, unsigned int *classes);
|
|||
extern struct ata_host *ata_host_alloc(struct device *dev, int max_ports);
|
||||
extern struct ata_host *ata_host_alloc_pinfo(struct device *dev,
|
||||
const struct ata_port_info * const * ppi, int n_ports);
|
||||
extern int ata_slave_link_init(struct ata_port *ap);
|
||||
extern void ata_host_get(struct ata_host *host);
|
||||
extern void ata_host_put(struct ata_host *host);
|
||||
extern int ata_host_start(struct ata_host *host);
|
||||
|
|
@ -1152,9 +1149,6 @@ extern void ata_msleep(struct ata_port *ap, unsigned int msecs);
|
|||
extern u32 ata_wait_register(struct ata_port *ap, void __iomem *reg, u32 mask,
|
||||
u32 val, unsigned long interval, unsigned long timeout);
|
||||
extern int atapi_cmd_type(u8 opcode);
|
||||
extern void ata_tf_to_fis(const struct ata_taskfile *tf,
|
||||
u8 pmp, int is_cmd, u8 *fis);
|
||||
extern void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf);
|
||||
extern unsigned long ata_pack_xfermask(unsigned long pio_mask,
|
||||
unsigned long mwdma_mask, unsigned long udma_mask);
|
||||
extern void ata_unpack_xfermask(unsigned long xfer_mask,
|
||||
|
|
@ -1195,6 +1189,16 @@ extern struct ata_device *ata_dev_pair(struct ata_device *adev);
|
|||
extern int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev);
|
||||
extern void ata_scsi_port_error_handler(struct Scsi_Host *host, struct ata_port *ap);
|
||||
extern void ata_scsi_cmd_error_handler(struct Scsi_Host *host, struct ata_port *ap, struct list_head *eh_q);
|
||||
|
||||
/*
|
||||
* SATA specific code - drivers/ata/libata-sata.c
|
||||
*/
|
||||
extern int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
|
||||
bool spm_wakeup);
|
||||
extern int ata_slave_link_init(struct ata_port *ap);
|
||||
extern void ata_tf_to_fis(const struct ata_taskfile *tf,
|
||||
u8 pmp, int is_cmd, u8 *fis);
|
||||
extern void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf);
|
||||
extern bool sata_lpm_ignore_phy_events(struct ata_link *link);
|
||||
|
||||
extern int ata_cable_40wire(struct ata_port *ap);
|
||||
|
|
|
|||
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