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ata: libata: add reset tracepoints

Browse source 
To follow the flow of control we should be using tracepoints, as
they will tie in with the actual I/O flow and deliver a better
overview about what it happening.
This patch adds tracepoints for hard reset, soft reset, and postreset
and adds them in the libata-eh control flow.
With that we can drop the reset DPRINTK calls in the various drivers.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
This commit is contained in:
Hannes Reinecke 2021-12-21 08:20:29 +01:00 committed by Damien Le Moal
parent 4baa5745ec
commit f8ec26d0f5
11 changed files with 115 additions and 57 deletions
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7
drivers/ata/ahci.c
View file

@ -700,8 +700,6 @@ static int ahci_vt8251_hardreset(struct ata_link *link, unsigned int *class,
bool online;
int rc;
DPRINTK("ENTER\n");
hpriv->stop_engine(ap);
rc = sata_link_hardreset(link, sata_ehc_deb_timing(&link->eh_context),
@ -709,8 +707,6 @@ static int ahci_vt8251_hardreset(struct ata_link *link, unsigned int *class,
hpriv->start_engine(ap);
DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);
/* vt8251 doesn't clear BSY on signature FIS reception,
* request follow-up softreset.
*/
@ -790,8 +786,6 @@ static int ahci_avn_hardreset(struct ata_link *link, unsigned int *class,
bool online;
int rc, i;
DPRINTK("ENTER\n");
hpriv->stop_engine(ap);
for (i = 0; i < 2; i++) {
@ -829,7 +823,6 @@ static int ahci_avn_hardreset(struct ata_link *link, unsigned int *class,
if (online)
*class = ahci_dev_classify(ap);
DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);
return rc;
}

4
drivers/ata/ahci_qoriq.c
View file

@ -103,8 +103,6 @@ static int ahci_qoriq_hardreset(struct ata_link *link, unsigned int *class,
int rc;
bool ls1021a_workaround = (qoriq_priv->type == AHCI_LS1021A);
DPRINTK("ENTER\n");
hpriv->stop_engine(ap);
/*
@ -146,8 +144,6 @@ static int ahci_qoriq_hardreset(struct ata_link *link, unsigned int *class,
if (online)
*class = ahci_dev_classify(ap);
DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);
return rc;
}

10
drivers/ata/libahci.c
View file

@ -1415,8 +1415,6 @@ int ahci_do_softreset(struct ata_link *link, unsigned int *class,
bool fbs_disabled = false;
int rc;
DPRINTK("ENTER\n");
/* prepare for SRST (AHCI-1.1 10.4.1) */
rc = ahci_kick_engine(ap);
if (rc && rc != -EOPNOTSUPP)
@ -1476,7 +1474,6 @@ int ahci_do_softreset(struct ata_link *link, unsigned int *class,
if (fbs_disabled)
ahci_enable_fbs(ap);
DPRINTK("EXIT, class=%u\n", *class);
return 0;
fail:
@ -1498,8 +1495,6 @@ static int ahci_softreset(struct ata_link *link, unsigned int *class,
{
int pmp = sata_srst_pmp(link);
DPRINTK("ENTER\n");
return ahci_do_softreset(link, class, pmp, deadline, ahci_check_ready);
}
EXPORT_SYMBOL_GPL(ahci_do_softreset);
@ -1529,8 +1524,6 @@ static int ahci_pmp_retry_softreset(struct ata_link *link, unsigned int *class,
int rc;
u32 irq_sts;
DPRINTK("ENTER\n");
rc = ahci_do_softreset(link, class, pmp, deadline,
ahci_bad_pmp_check_ready);
@ -1564,8 +1557,6 @@ int ahci_do_hardreset(struct ata_link *link, unsigned int *class,
struct ata_taskfile tf;
int rc;
DPRINTK("ENTER\n");
hpriv->stop_engine(ap);
/* clear D2H reception area to properly wait for D2H FIS */
@ -1581,7 +1572,6 @@ int ahci_do_hardreset(struct ata_link *link, unsigned int *class,
if (*online)
*class = ahci_dev_classify(ap);
DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);
return rc;
}
EXPORT_SYMBOL_GPL(ahci_do_hardreset);

4
drivers/ata/libata-core.c
View file

@ -3656,16 +3656,12 @@ void ata_std_postreset(struct ata_link *link, unsigned int *classes)
{
u32 serror;
DPRINTK("ENTER\n");
/* reset complete, clear SError */
if (!sata_scr_read(link, SCR_ERROR, &serror))
sata_scr_write(link, SCR_ERROR, serror);
/* print link status */
sata_print_link_status(link);
DPRINTK("EXIT\n");
}
EXPORT_SYMBOL_GPL(ata_std_postreset);

21
drivers/ata/libata-eh.c
View file

@ -2596,12 +2596,19 @@ int ata_eh_reset(struct ata_link *link, int classify,
/* mark that this EH session started with reset */
ehc->last_reset = jiffies;
if (reset == hardreset)
if (reset == hardreset) {
ehc->i.flags |= ATA_EHI_DID_HARDRESET;
else
trace_ata_link_hardreset_begin(link, classes, deadline);
} else {
ehc->i.flags |= ATA_EHI_DID_SOFTRESET;
trace_ata_link_softreset_begin(link, classes, deadline);
}
rc = ata_do_reset(link, reset, classes, deadline, true);
if (reset == hardreset)
trace_ata_link_hardreset_end(link, classes, rc);
else
trace_ata_link_softreset_end(link, classes, rc);
if (rc && rc != -EAGAIN) {
failed_link = link;
goto fail;
@ -2615,8 +2622,11 @@ int ata_eh_reset(struct ata_link *link, int classify,
ata_link_info(slave, "hard resetting link\n");
ata_eh_about_to_do(slave, NULL, ATA_EH_RESET);
trace_ata_slave_hardreset_begin(slave, classes,
deadline);
tmp = ata_do_reset(slave, reset, classes, deadline,
false);
trace_ata_slave_hardreset_end(slave, classes, tmp);
switch (tmp) {
case -EAGAIN:
rc = -EAGAIN;
@ -2644,7 +2654,9 @@ int ata_eh_reset(struct ata_link *link, int classify,
}
ata_eh_about_to_do(link, NULL, ATA_EH_RESET);
trace_ata_link_softreset_begin(link, classes, deadline);
rc = ata_do_reset(link, reset, classes, deadline, true);
trace_ata_link_softreset_end(link, classes, rc);
if (rc) {
failed_link = link;
goto fail;
@ -2698,8 +2710,11 @@ int ata_eh_reset(struct ata_link *link, int classify,
*/
if (postreset) {
postreset(link, classes);
if (slave)
trace_ata_link_postreset(link, classes, rc);
if (slave) {
postreset(slave, classes);
trace_ata_slave_postreset(slave, classes, rc);
}
}
/*

11
drivers/ata/libata-sff.c
View file

@ -1956,8 +1956,6 @@ static int ata_bus_softreset(struct ata_port *ap, unsigned int devmask,
{
struct ata_ioports *ioaddr = &ap->ioaddr;
DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
if (ap->ioaddr.ctl_addr) {
/* software reset. causes dev0 to be selected */
iowrite8(ap->ctl, ioaddr->ctl_addr);
@ -1995,8 +1993,6 @@ int ata_sff_softreset(struct ata_link *link, unsigned int *classes,
int rc;
u8 err;
DPRINTK("ENTER\n");
/* determine if device 0/1 are present */
if (ata_devchk(ap, 0))
devmask |= (1 << 0);
@ -2007,7 +2003,6 @@ int ata_sff_softreset(struct ata_link *link, unsigned int *classes,
ap->ops->sff_dev_select(ap, 0);
/* issue bus reset */
DPRINTK("about to softreset, devmask=%x\n", devmask);
rc = ata_bus_softreset(ap, devmask, deadline);
/* if link is occupied, -ENODEV too is an error */
if (rc && (rc != -ENODEV || sata_scr_valid(link))) {
@ -2022,7 +2017,6 @@ int ata_sff_softreset(struct ata_link *link, unsigned int *classes,
classes[1] = ata_sff_dev_classify(&link->device[1],
devmask & (1 << 1), &err);
DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
return 0;
}
EXPORT_SYMBOL_GPL(ata_sff_softreset);
@ -2055,7 +2049,6 @@ int sata_sff_hardreset(struct ata_link *link, unsigned int *class,
if (online)
*class = ata_sff_dev_classify(link->device, 1, NULL);
DPRINTK("EXIT, class=%u\n", *class);
return rc;
}
EXPORT_SYMBOL_GPL(sata_sff_hardreset);
@ -2085,10 +2078,8 @@ void ata_sff_postreset(struct ata_link *link, unsigned int *classes)
ap->ops->sff_dev_select(ap, 0);
/* bail out if no device is present */
if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
DPRINTK("EXIT, no device\n");
if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE)
return;
}
/* set up device control */
if (ap->ops->sff_set_devctl || ap->ioaddr.ctl_addr) {

2
drivers/ata/pata_octeon_cf.c
View file

@ -440,7 +440,6 @@ static int octeon_cf_softreset16(struct ata_link *link, unsigned int *classes,
int rc;
u8 err;
DPRINTK("about to softreset\n");
__raw_writew(ap->ctl, base + 0xe);
udelay(20);
__raw_writew(ap->ctl | ATA_SRST, base + 0xe);
@ -455,7 +454,6 @@ static int octeon_cf_softreset16(struct ata_link *link, unsigned int *classes,
/* determine by signature whether we have ATA or ATAPI devices */
classes[0] = ata_sff_dev_classify(&link->device[0], 1, &err);
DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
return 0;
}

10
drivers/ata/sata_fsl.c
View file

@ -827,8 +827,6 @@ static int sata_fsl_hardreset(struct ata_link *link, unsigned int *class,
int i = 0;
unsigned long start_jiffies;
DPRINTK("in xx_hardreset\n");
try_offline_again:
/*
* Force host controller to go off-line, aborting current operations
@ -943,10 +941,7 @@ static int sata_fsl_softreset(struct ata_link *link, unsigned int *class,
u8 *cfis;
u32 Serror;
DPRINTK("in xx_softreset\n");
if (ata_link_offline(link)) {
DPRINTK("PHY reports no device\n");
*class = ATA_DEV_NONE;
return 0;
}
@ -959,8 +954,6 @@ static int sata_fsl_softreset(struct ata_link *link, unsigned int *class,
* reached here, we can send a command to the target device
*/
DPRINTK("Sending SRST/device reset\n");
ata_tf_init(link->device, &tf);
cfis = (u8 *) &pp->cmdentry->cfis;
@ -1032,8 +1025,6 @@ static int sata_fsl_softreset(struct ata_link *link, unsigned int *class,
*/
iowrite32(0x01, CC + hcr_base); /* We know it will be cmd#0 always */
DPRINTK("SATA FSL : Now checking device signature\n");
*class = ATA_DEV_NONE;
/* Verify if SStatus indicates device presence */
@ -1047,7 +1038,6 @@ static int sata_fsl_softreset(struct ata_link *link, unsigned int *class,
*class = sata_fsl_dev_classify(ap);
DPRINTK("class = %d\n", *class);
VPRINTK("ccreg = 0x%x\n", ioread32(hcr_base + CC));
VPRINTK("cereg = 0x%x\n", ioread32(hcr_base + CE));
}

4
drivers/ata/sata_rcar.c
View file

@ -323,8 +323,6 @@ static int sata_rcar_bus_softreset(struct ata_port *ap, unsigned long deadline)
{
struct ata_ioports *ioaddr = &ap->ioaddr;
DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
/* software reset. causes dev0 to be selected */
iowrite32(ap->ctl, ioaddr->ctl_addr);
udelay(20);
@ -350,7 +348,6 @@ static int sata_rcar_softreset(struct ata_link *link, unsigned int *classes,
devmask |= 1 << 0;
/* issue bus reset */
DPRINTK("about to softreset, devmask=%x\n", devmask);
rc = sata_rcar_bus_softreset(ap, deadline);
/* if link is occupied, -ENODEV too is an error */
if (rc && (rc != -ENODEV || sata_scr_valid(link))) {
@ -361,7 +358,6 @@ static int sata_rcar_softreset(struct ata_link *link, unsigned int *classes,
/* determine by signature whether we have ATA or ATAPI devices */
classes[0] = ata_sff_dev_classify(&link->device[0], devmask, &err);
DPRINTK("classes[0]=%u\n", classes[0]);
return 0;
}

3
drivers/ata/sata_sil24.c
View file

@ -656,8 +656,6 @@ static int sil24_softreset(struct ata_link *link, unsigned int *class,
const char *reason;
int rc;
DPRINTK("ENTER\n");
/* put the port into known state */
if (sil24_init_port(ap)) {
reason = "port not ready";
@ -682,7 +680,6 @@ static int sil24_softreset(struct ata_link *link, unsigned int *class,
sil24_read_tf(ap, 0, &tf);
*class = ata_port_classify(ap, &tf);
DPRINTK("EXIT, class=%u\n", *class);
return 0;
err:

96
include/trace/events/libata.h
View file

@ -132,6 +132,22 @@
ata_protocol_name(ATAPI_PROT_PIO), \
ata_protocol_name(ATAPI_PROT_DMA))
#define ata_class_name(class) { class, #class }
#define show_class_name(val) \
__print_symbolic(val, \
ata_class_name(ATA_DEV_UNKNOWN), \
ata_class_name(ATA_DEV_ATA), \
ata_class_name(ATA_DEV_ATA_UNSUP), \
ata_class_name(ATA_DEV_ATAPI), \
ata_class_name(ATA_DEV_ATAPI_UNSUP), \
ata_class_name(ATA_DEV_PMP), \
ata_class_name(ATA_DEV_PMP_UNSUP), \
ata_class_name(ATA_DEV_SEMB), \
ata_class_name(ATA_DEV_SEMB_UNSUP), \
ata_class_name(ATA_DEV_ZAC), \
ata_class_name(ATA_DEV_ZAC_UNSUP), \
ata_class_name(ATA_DEV_NONE))
const char *libata_trace_parse_status(struct trace_seq*, unsigned char);
#define __parse_status(s) libata_trace_parse_status(p, s)
@ -329,6 +345,86 @@ TRACE_EVENT(ata_eh_link_autopsy_qc,
__parse_eh_err_mask(__entry->eh_err_mask))
);
DECLARE_EVENT_CLASS(ata_link_reset_begin_template,
TP_PROTO(struct ata_link *link, unsigned int *class, unsigned long deadline),
TP_ARGS(link, class, deadline),
TP_STRUCT__entry(
__field( unsigned int, ata_port )
__array( unsigned int, class, 2 )
__field( unsigned long, deadline )
),
TP_fast_assign(
__entry->ata_port = link->ap->print_id;
memcpy(__entry->class, class, 2);
__entry->deadline = deadline;
),
TP_printk("ata_port=%u deadline=%lu classes=[%s,%s]",
__entry->ata_port, __entry->deadline,
show_class_name(__entry->class[0]),
show_class_name(__entry->class[1]))
);
DEFINE_EVENT(ata_link_reset_begin_template, ata_link_hardreset_begin,
TP_PROTO(struct ata_link *link, unsigned int *class, unsigned long deadline),
TP_ARGS(link, class, deadline));
DEFINE_EVENT(ata_link_reset_begin_template, ata_slave_hardreset_begin,
TP_PROTO(struct ata_link *link, unsigned int *class, unsigned long deadline),
TP_ARGS(link, class, deadline));
DEFINE_EVENT(ata_link_reset_begin_template, ata_link_softreset_begin,
TP_PROTO(struct ata_link *link, unsigned int *class, unsigned long deadline),
TP_ARGS(link, class, deadline));
DECLARE_EVENT_CLASS(ata_link_reset_end_template,
TP_PROTO(struct ata_link *link, unsigned int *class, int rc),
TP_ARGS(link, class, rc),
TP_STRUCT__entry(
__field( unsigned int, ata_port )
__array( unsigned int, class, 2 )
__field( int, rc )
),
TP_fast_assign(
__entry->ata_port = link->ap->print_id;
memcpy(__entry->class, class, 2);
__entry->rc = rc;
),
TP_printk("ata_port=%u rc=%d class=[%s,%s]",
__entry->ata_port, __entry->rc,
show_class_name(__entry->class[0]),
show_class_name(__entry->class[1]))
);
DEFINE_EVENT(ata_link_reset_end_template, ata_link_hardreset_end,
TP_PROTO(struct ata_link *link, unsigned int *class, int rc),
TP_ARGS(link, class, rc));
DEFINE_EVENT(ata_link_reset_end_template, ata_slave_hardreset_end,
TP_PROTO(struct ata_link *link, unsigned int *class, int rc),
TP_ARGS(link, class, rc));
DEFINE_EVENT(ata_link_reset_end_template, ata_link_softreset_end,
TP_PROTO(struct ata_link *link, unsigned int *class, int rc),
TP_ARGS(link, class, rc));
DEFINE_EVENT(ata_link_reset_end_template, ata_link_postreset,
TP_PROTO(struct ata_link *link, unsigned int *class, int rc),
TP_ARGS(link, class, rc));
DEFINE_EVENT(ata_link_reset_end_template, ata_slave_postreset,
TP_PROTO(struct ata_link *link, unsigned int *class, int rc),
TP_ARGS(link, class, rc));
#endif /* _TRACE_LIBATA_H */
/* This part must be outside protection */