From: Tejun Heo Date: Mon, 7 Apr 2008 13:47:19 +0000 (+0900) Subject: libata: implement and use sata_std_hardreset() X-Git-Tag: v2.6.26-rc1~1150^2~29 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=57c9efdfb3cee5d4564fcb5f70555e2edb1bc52a;p=linux-2.6 libata: implement and use sata_std_hardreset() Implement sata_std_hardreset(), which simply wraps around sata_link_hardreset(). sata_std_hardreset() becomes new standard hardreset method for sata_port_ops and sata_sff_hardreset() moves from ata_base_port_ops to ata_sff_port_ops, which is where it really belongs. ata_is_builtin_hardreset() is added so that both ata_std_error_handler() and ata_sff_error_handler() skip both builtin hardresets if SCR isn't accessible. piix_sidpr_hardreset() in ata_piix.c is identical to sata_std_hardreset() in functionality and got replaced with the standard function. Signed-off-by: Tejun Heo --- diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c index f59a55bfad..b7c38eeb49 100644 --- a/drivers/ata/ata_piix.c +++ b/drivers/ata/ata_piix.c @@ -165,8 +165,6 @@ static void piix_set_dmamode(struct ata_port *ap, struct ata_device *adev); static void ich_set_dmamode(struct ata_port *ap, struct ata_device *adev); static int ich_pata_cable_detect(struct ata_port *ap); static u8 piix_vmw_bmdma_status(struct ata_port *ap); -static int piix_sidpr_hardreset(struct ata_link *link, unsigned int *class, - unsigned long deadline); static int piix_sidpr_scr_read(struct ata_port *ap, unsigned int reg, u32 *val); static int piix_sidpr_scr_write(struct ata_port *ap, unsigned int reg, u32 val); #ifdef CONFIG_PM @@ -319,7 +317,7 @@ static struct ata_port_operations piix_sata_ops = { static struct ata_port_operations piix_sidpr_sata_ops = { .inherits = &piix_sata_ops, - .hardreset = piix_sidpr_hardreset, + .hardreset = sata_std_hardreset, .scr_read = piix_sidpr_scr_read, .scr_write = piix_sidpr_scr_write, }; @@ -1015,29 +1013,6 @@ static int piix_sidpr_scr_write(struct ata_port *ap, unsigned int reg, u32 val) return 0; } -static int piix_sidpr_hardreset(struct ata_link *link, unsigned int *class, - unsigned long deadline) -{ - const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context); - int rc; - - /* do hardreset */ - rc = sata_link_hardreset(link, timing, deadline, NULL, NULL); - if (rc) { - ata_link_printk(link, KERN_ERR, - "COMRESET failed (errno=%d)\n", rc); - return rc; - } - - /* TODO: phy layer with polling, timeouts, etc. */ - if (ata_link_offline(link)) { - *class = ATA_DEV_NONE; - return 0; - } - - return -EAGAIN; -} - #ifdef CONFIG_PM static int piix_broken_suspend(void) { diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index b607292b64..c4fd4afbf3 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -75,7 +75,6 @@ const unsigned long sata_deb_timing_long[] = { 100, 2000, 5000 }; const struct ata_port_operations ata_base_port_ops = { .prereset = ata_std_prereset, - .hardreset = sata_sff_hardreset, .postreset = ata_std_postreset, .error_handler = ata_std_error_handler, }; @@ -84,6 +83,7 @@ const struct ata_port_operations sata_port_ops = { .inherits = &ata_base_port_ops, .qc_defer = ata_std_qc_defer, + .hardreset = sata_std_hardreset, .sff_dev_select = ata_noop_dev_select, }; @@ -3660,6 +3660,33 @@ int sata_link_hardreset(struct ata_link *link, const unsigned long *timing, return rc; } +/** + * sata_std_hardreset - COMRESET w/o waiting or classification + * @link: link to reset + * @class: resulting class of attached device + * @deadline: deadline jiffies for the operation + * + * Standard SATA COMRESET w/o waiting or classification. + * + * LOCKING: + * Kernel thread context (may sleep) + * + * RETURNS: + * 0 if link offline, -EAGAIN if link online, -errno on errors. + */ +int sata_std_hardreset(struct ata_link *link, unsigned int *class, + unsigned long deadline) +{ + const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context); + bool online; + int rc; + + /* do hardreset */ + rc = sata_link_hardreset(link, timing, deadline, &online, NULL); + *class = ATA_DEV_NONE; + return online ? -EAGAIN : rc; +} + /** * ata_std_postreset - standard postreset callback * @link: the target ata_link @@ -6225,6 +6252,7 @@ EXPORT_SYMBOL_GPL(sata_link_debounce); EXPORT_SYMBOL_GPL(sata_link_resume); EXPORT_SYMBOL_GPL(ata_std_prereset); EXPORT_SYMBOL_GPL(sata_link_hardreset); +EXPORT_SYMBOL_GPL(sata_std_hardreset); EXPORT_SYMBOL_GPL(ata_std_postreset); EXPORT_SYMBOL_GPL(ata_dev_classify); EXPORT_SYMBOL_GPL(ata_dev_pair); diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c index f4f9c27838..21687bbd9a 100644 --- a/drivers/ata/libata-eh.c +++ b/drivers/ata/libata-eh.c @@ -2857,11 +2857,8 @@ void ata_std_error_handler(struct ata_port *ap) struct ata_port_operations *ops = ap->ops; ata_reset_fn_t hardreset = ops->hardreset; - /* sata_std_hardreset is inherited to all drivers from - * ata_base_port_ops. Ignore it if SCR access is not - * available. - */ - if (hardreset == sata_sff_hardreset && !sata_scr_valid(&ap->link)) + /* ignore built-in hardreset if SCR access is not available */ + if (ata_is_builtin_hardreset(hardreset) && !sata_scr_valid(&ap->link)) hardreset = NULL; ata_do_eh(ap, ops->prereset, ops->softreset, hardreset, ops->postreset); diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c index 0b97e84d3a..f464ca1fa2 100644 --- a/drivers/ata/libata-sff.c +++ b/drivers/ata/libata-sff.c @@ -49,6 +49,7 @@ const struct ata_port_operations ata_sff_port_ops = { .thaw = ata_sff_thaw, .prereset = ata_sff_prereset, .softreset = ata_sff_softreset, + .hardreset = sata_sff_hardreset, .postreset = ata_sff_postreset, .error_handler = ata_sff_error_handler, .post_internal_cmd = ata_sff_post_internal_cmd, @@ -2031,14 +2032,12 @@ void ata_sff_error_handler(struct ata_port *ap) /* PIO and DMA engines have been stopped, perform recovery */ - /* ata_sff_softreset and sata_sff_hardreset are inherited to - * all SFF drivers from ata_sff_port_ops. Ignore softreset if - * ctl isn't accessible. Ignore hardreset if SCR access isn't - * available. + /* Ignore ata_sff_softreset if ctl isn't accessible and + * built-in hardresets if SCR access isn't available. */ if (softreset == ata_sff_softreset && !ap->ioaddr.ctl_addr) softreset = NULL; - if (hardreset == sata_sff_hardreset && !sata_scr_valid(&ap->link)) + if (ata_is_builtin_hardreset(hardreset) && !sata_scr_valid(&ap->link)) hardreset = NULL; ata_do_eh(ap, ap->ops->prereset, softreset, hardreset, diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h index 08af43e2c0..87f54a1db3 100644 --- a/drivers/ata/libata.h +++ b/drivers/ata/libata.h @@ -38,6 +38,15 @@ struct ata_scsi_args { void (*done)(struct scsi_cmnd *); }; +static inline int ata_is_builtin_hardreset(ata_reset_fn_t reset) +{ + if (reset == sata_std_hardreset) + return 1; + if (reset == sata_sff_hardreset) + return 1; + return 0; +} + /* libata-core.c */ enum { /* flags for ata_dev_read_id() */ diff --git a/include/linux/libata.h b/include/linux/libata.h index d9ebce2bf5..c060cd3cba 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -853,6 +853,8 @@ extern int sata_link_resume(struct ata_link *link, const unsigned long *params, extern int sata_link_hardreset(struct ata_link *link, const unsigned long *timing, unsigned long deadline, bool *online, int (*check_ready)(struct ata_link *)); +extern int sata_std_hardreset(struct ata_link *link, unsigned int *class, + unsigned long deadline); extern void ata_std_postreset(struct ata_link *link, unsigned int *classes); extern void ata_port_disable(struct ata_port *);