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Subject[PATCH v4 16/27] ata: start separating SATA specific code from libata-core.c
Date
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

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
drivers/ata/Makefile | 1 +
drivers/ata/libata-core.c | 245 ------------------------------------
drivers/ata/libata-sata.c | 258 ++++++++++++++++++++++++++++++++++++++
include/linux/libata.h | 16 ++-
4 files changed, 269 insertions(+), 251 deletions(-)
create mode 100644 drivers/ata/libata-sata.c

diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index cdaf965fed25..b8aebfb14e82 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -123,6 +123,7 @@ obj-$(CONFIG_PATA_LEGACY) += pata_legacy.o

libata-y := libata-core.o libata-scsi.o libata-eh.o \
libata-transport.o libata-trace.o
+libata-$(CONFIG_SATA_HOST) += libata-sata.o
libata-$(CONFIG_ATA_SFF) += libata-sff.o
libata-$(CONFIG_SATA_PMP) += libata-pmp.o
libata-$(CONFIG_ATA_ACPI) += libata-acpi.o
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index fa1fd0735321..270fe10468c1 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -531,81 +531,6 @@ int atapi_cmd_type(u8 opcode)
}
EXPORT_SYMBOL_GPL(atapi_cmd_type);

-/**
- * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
- * @tf: Taskfile to convert
- * @pmp: Port multiplier port
- * @is_cmd: This FIS is for command
- * @fis: Buffer into which data will output
- *
- * Converts a standard ATA taskfile to a Serial ATA
- * FIS structure (Register - Host to Device).
- *
- * LOCKING:
- * Inherited from caller.
- */
-void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
-{
- fis[0] = 0x27; /* Register - Host to Device FIS */
- fis[1] = pmp & 0xf; /* Port multiplier number*/
- if (is_cmd)
- fis[1] |= (1 << 7); /* bit 7 indicates Command FIS */
-
- fis[2] = tf->command;
- fis[3] = tf->feature;
-
- fis[4] = tf->lbal;
- fis[5] = tf->lbam;
- fis[6] = tf->lbah;
- fis[7] = tf->device;
-
- fis[8] = tf->hob_lbal;
- fis[9] = tf->hob_lbam;
- fis[10] = tf->hob_lbah;
- fis[11] = tf->hob_feature;
-
- fis[12] = tf->nsect;
- fis[13] = tf->hob_nsect;
- fis[14] = 0;
- fis[15] = tf->ctl;
-
- fis[16] = tf->auxiliary & 0xff;
- fis[17] = (tf->auxiliary >> 8) & 0xff;
- fis[18] = (tf->auxiliary >> 16) & 0xff;
- fis[19] = (tf->auxiliary >> 24) & 0xff;
-}
-EXPORT_SYMBOL_GPL(ata_tf_to_fis);
-
-/**
- * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
- * @fis: Buffer from which data will be input
- * @tf: Taskfile to output
- *
- * Converts a serial ATA FIS structure to a standard ATA taskfile.
- *
- * LOCKING:
- * Inherited from caller.
- */
-
-void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
-{
- tf->command = fis[2]; /* status */
- tf->feature = fis[3]; /* error */
-
- tf->lbal = fis[4];
- tf->lbam = fis[5];
- tf->lbah = fis[6];
- tf->device = fis[7];
-
- tf->hob_lbal = fis[8];
- tf->hob_lbam = fis[9];
- tf->hob_lbah = fis[10];
-
- tf->nsect = fis[12];
- tf->hob_nsect = fis[13];
-}
-EXPORT_SYMBOL_GPL(ata_tf_from_fis);
-
static const u8 ata_rw_cmds[] = {
/* pio multi */
ATA_CMD_READ_MULTI,
@@ -3791,81 +3716,6 @@ int sata_link_resume(struct ata_link *link, const unsigned long *params,
}
EXPORT_SYMBOL_GPL(sata_link_resume);

-/**
- * sata_link_scr_lpm - manipulate SControl IPM and SPM fields
- * @link: ATA link to manipulate SControl for
- * @policy: LPM policy to configure
- * @spm_wakeup: initiate LPM transition to active state
- *
- * Manipulate the IPM field of the SControl register of @link
- * according to @policy. If @policy is ATA_LPM_MAX_POWER and
- * @spm_wakeup is %true, the SPM field is manipulated to wake up
- * the link. This function also clears PHYRDY_CHG before
- * returning.
- *
- * LOCKING:
- * EH context.
- *
- * RETURNS:
- * 0 on success, -errno otherwise.
- */
-int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
- bool spm_wakeup)
-{
- struct ata_eh_context *ehc = &link->eh_context;
- bool woken_up = false;
- u32 scontrol;
- int rc;
-
- rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
- if (rc)
- return rc;
-
- switch (policy) {
- case ATA_LPM_MAX_POWER:
- /* disable all LPM transitions */
- scontrol |= (0x7 << 8);
- /* initiate transition to active state */
- if (spm_wakeup) {
- scontrol |= (0x4 << 12);
- woken_up = true;
- }
- break;
- case ATA_LPM_MED_POWER:
- /* allow LPM to PARTIAL */
- scontrol &= ~(0x1 << 8);
- scontrol |= (0x6 << 8);
- break;
- case ATA_LPM_MED_POWER_WITH_DIPM:
- case ATA_LPM_MIN_POWER_WITH_PARTIAL:
- case ATA_LPM_MIN_POWER:
- if (ata_link_nr_enabled(link) > 0)
- /* no restrictions on LPM transitions */
- scontrol &= ~(0x7 << 8);
- else {
- /* empty port, power off */
- scontrol &= ~0xf;
- scontrol |= (0x1 << 2);
- }
- break;
- default:
- WARN_ON(1);
- }
-
- rc = sata_scr_write(link, SCR_CONTROL, scontrol);
- if (rc)
- 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_std_prereset - prepare for reset
* @link: ATA link to be reset
@@ -6117,69 +5967,6 @@ struct ata_host *ata_host_alloc_pinfo(struct device *dev,
}
EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);

-/**
- * 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);
-
static void ata_host_stop(struct device *gendev, void *res)
{
struct ata_host *host = dev_get_drvdata(gendev);
@@ -7103,38 +6890,6 @@ u32 ata_wait_register(struct ata_port *ap, void __iomem *reg, u32 mask, u32 val,
}
EXPORT_SYMBOL_GPL(ata_wait_register);

-/**
- * 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);
-
/*
* Dummy port_ops
*/
diff --git a/drivers/ata/libata-sata.c b/drivers/ata/libata-sata.c
new file mode 100644
index 000000000000..04f1ecaf414c
--- /dev/null
+++ b/drivers/ata/libata-sata.c
@@ -0,0 +1,258 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * SATA specific part of ATA helper library
+ *
+ * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
+ * Copyright 2003-2004 Jeff Garzik
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/libata.h>
+
+#include "libata.h"
+
+/**
+ * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
+ * @tf: Taskfile to convert
+ * @pmp: Port multiplier port
+ * @is_cmd: This FIS is for command
+ * @fis: Buffer into which data will output
+ *
+ * Converts a standard ATA taskfile to a Serial ATA
+ * FIS structure (Register - Host to Device).
+ *
+ * LOCKING:
+ * Inherited from caller.
+ */
+void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
+{
+ fis[0] = 0x27; /* Register - Host to Device FIS */
+ fis[1] = pmp & 0xf; /* Port multiplier number*/
+ if (is_cmd)
+ fis[1] |= (1 << 7); /* bit 7 indicates Command FIS */
+
+ fis[2] = tf->command;
+ fis[3] = tf->feature;
+
+ fis[4] = tf->lbal;
+ fis[5] = tf->lbam;
+ fis[6] = tf->lbah;
+ fis[7] = tf->device;
+
+ fis[8] = tf->hob_lbal;
+ fis[9] = tf->hob_lbam;
+ fis[10] = tf->hob_lbah;
+ fis[11] = tf->hob_feature;
+
+ fis[12] = tf->nsect;
+ fis[13] = tf->hob_nsect;
+ fis[14] = 0;
+ fis[15] = tf->ctl;
+
+ fis[16] = tf->auxiliary & 0xff;
+ fis[17] = (tf->auxiliary >> 8) & 0xff;
+ fis[18] = (tf->auxiliary >> 16) & 0xff;
+ fis[19] = (tf->auxiliary >> 24) & 0xff;
+}
+EXPORT_SYMBOL_GPL(ata_tf_to_fis);
+
+/**
+ * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
+ * @fis: Buffer from which data will be input
+ * @tf: Taskfile to output
+ *
+ * Converts a serial ATA FIS structure to a standard ATA taskfile.
+ *
+ * LOCKING:
+ * Inherited from caller.
+ */
+
+void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
+{
+ tf->command = fis[2]; /* status */
+ tf->feature = fis[3]; /* error */
+
+ tf->lbal = fis[4];
+ tf->lbam = fis[5];
+ tf->lbah = fis[6];
+ tf->device = fis[7];
+
+ tf->hob_lbal = fis[8];
+ tf->hob_lbam = fis[9];
+ tf->hob_lbah = fis[10];
+
+ tf->nsect = fis[12];
+ tf->hob_nsect = fis[13];
+}
+EXPORT_SYMBOL_GPL(ata_tf_from_fis);
+
+/**
+ * sata_link_scr_lpm - manipulate SControl IPM and SPM fields
+ * @link: ATA link to manipulate SControl for
+ * @policy: LPM policy to configure
+ * @spm_wakeup: initiate LPM transition to active state
+ *
+ * Manipulate the IPM field of the SControl register of @link
+ * according to @policy. If @policy is ATA_LPM_MAX_POWER and
+ * @spm_wakeup is %true, the SPM field is manipulated to wake up
+ * the link. This function also clears PHYRDY_CHG before
+ * returning.
+ *
+ * LOCKING:
+ * EH context.
+ *
+ * RETURNS:
+ * 0 on success, -errno otherwise.
+ */
+int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
+ bool spm_wakeup)
+{
+ struct ata_eh_context *ehc = &link->eh_context;
+ bool woken_up = false;
+ u32 scontrol;
+ int rc;
+
+ rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
+ if (rc)
+ return rc;
+
+ switch (policy) {
+ case ATA_LPM_MAX_POWER:
+ /* disable all LPM transitions */
+ scontrol |= (0x7 << 8);
+ /* initiate transition to active state */
+ if (spm_wakeup) {
+ scontrol |= (0x4 << 12);
+ woken_up = true;
+ }
+ break;
+ case ATA_LPM_MED_POWER:
+ /* allow LPM to PARTIAL */
+ scontrol &= ~(0x1 << 8);
+ scontrol |= (0x6 << 8);
+ break;
+ case ATA_LPM_MED_POWER_WITH_DIPM:
+ case ATA_LPM_MIN_POWER_WITH_PARTIAL:
+ case ATA_LPM_MIN_POWER:
+ if (ata_link_nr_enabled(link) > 0)
+ /* no restrictions on LPM transitions */
+ scontrol &= ~(0x7 << 8);
+ else {
+ /* empty port, power off */
+ scontrol &= ~0xf;
+ scontrol |= (0x1 << 2);
+ }
+ break;
+ default:
+ WARN_ON(1);
+ }
+
+ rc = sata_scr_write(link, SCR_CONTROL, scontrol);
+ if (rc)
+ 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);
diff --git a/include/linux/libata.h b/include/linux/libata.h
index b1b3e5e0a301..f38faa80b2ba 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1074,8 +1074,6 @@ 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 *));
@@ -1086,7 +1084,6 @@ 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);
@@ -1146,9 +1143,6 @@ 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,
@@ -1197,6 +1191,16 @@ extern void ata_scsi_port_error_handler(struct Scsi_Host *host,
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);
--
2.24.1
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