03_libata_rework-cc-generation.patch
This patch refactors the check condition creation within
libata. Changes include:
- ata_to_sense_error() now *only* performs the translation
from an ATA status/error register combination to a SCSI
SK/ASC/ASCQ combination. Additionally, the translation is
logged at level KERNEL_ERR and any untranslatable combos are
logged at level KERNEL_WARNING.
- ata_dump_status() is modified to take a taskfile struct as
argument in preparation for a future patch which will add
proper display of the failing location (LBA or CHS)
- created ata_gen_fixed_sense() to generate a fixed length CC
sense block.
- ata_pass_thru_cc() has been renamed to
ata_gen_ata_desc_sense() to fit the naming convention
mentioned above. Its guts were changed a bit as well.
- ata_scsi_qc_complete() has been modified to fix a bug where
ATA_12/16 commands would not generate a sense block on
error. Other changes made here as well, including the call
to ata_dump_status().
Signed-off-by: Brett Russ <[email protected]>
libata-scsi.c | 238 +++++++++++++++++++++++++++++++++++-----------------------
libata.h | 1
2 files changed, 147 insertions(+), 92 deletions(-)
Index: libata-dev-2.6/drivers/scsi/libata-scsi.c
===================================================================
--- libata-dev-2.6.orig/drivers/scsi/libata-scsi.c 2005-03-23 15:35:09.000000000 -0500
+++ libata-dev-2.6/drivers/scsi/libata-scsi.c 2005-03-23 15:35:10.000000000 -0500
@@ -342,8 +342,10 @@ struct ata_queued_cmd *ata_scsi_qc_new(s
* LOCKING:
* inherited from caller
*/
-void ata_dump_status(unsigned id, u8 stat, u8 err)
+void ata_dump_status(unsigned id, struct ata_taskfile *tf)
{
+ u8 stat = tf->command, err = tf->feature;
+
printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
if (stat & ATA_BUSY) {
printk("Busy }\n"); /* Data is not valid in this case */
@@ -375,23 +377,23 @@ void ata_dump_status(unsigned id, u8 sta
/**
* ata_to_sense_error - convert ATA error to SCSI error
- * @qc: Command that we are erroring out
* @drv_stat: value contained in ATA status register
+ * @drv_err: value contained in ATA error register
+ * @sk: the sense key we'll fill out
+ * @asc: the additional sense code we'll fill out
+ * @ascq: the additional sense code qualifier we'll fill out
*
- * Converts an ATA error into a SCSI error. While we are at it
- * we decode and dump the ATA error for the user so that they
- * have some idea what really happened at the non make-believe
- * layer.
+ * Converts an ATA error into a SCSI error. Fill out pointers to
+ * SK, ASC, and ASCQ bytes for later use in fixed or descriptor
+ * format sense blocks.
*
* LOCKING:
* spin_lock_irqsave(host_set lock)
*/
-
-void ata_to_sense_error(struct ata_queued_cmd *qc, u8 drv_stat)
+void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, u8 *asc,
+ u8 *ascq)
{
- struct scsi_cmnd *cmd = qc->scsicmd;
- u8 err = 0;
- unsigned char *sb = cmd->sense_buffer;
+ int i;
/* Based on the 3ware driver translation table */
static unsigned char sense_table[][4] = {
/* BBD|ECC|ID|MAR */
@@ -432,102 +434,101 @@ void ata_to_sense_error(struct ata_queue
{0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered
{0xFF, 0xFF, 0xFF, 0xFF}, // END mark
};
- int i = 0;
-
- cmd->result = SAM_STAT_CHECK_CONDITION;
/*
* Is this an error we can process/parse
*/
+ if (drv_stat & ATA_BUSY) {
+ drv_err = 0; /* Ignore the err bits, they're invalid */
+ }
- if (drv_stat & ATA_ERR)
- err = ata_chk_err(qc->ap); /* Read the err bits */
-
- ata_dump_status(qc->ap->id, drv_stat, err);
-
- /* Look for err */
- while (sense_table[i][0] != 0xFF) {
- /* Look for best matches first */
- if ((sense_table[i][0] & err) == sense_table[i][0]) {
- sb[0] = 0x70;
- sb[2] = sense_table[i][1];
- sb[7] = 0x0a;
- sb[12] = sense_table[i][2];
- sb[13] = sense_table[i][3];
- return;
+ if (drv_err) {
+ /* Look for drv_err */
+ for (i = 0; sense_table[i][0] != 0xFF; i++) {
+ /* Look for best matches first */
+ if ((sense_table[i][0] & drv_err) ==
+ sense_table[i][0]) {
+ *sk = sense_table[i][1];
+ *asc = sense_table[i][2];
+ *ascq = sense_table[i][3];
+ goto translate_done;
+ }
}
- i++;
+ /* No immediate match */
+ printk(KERN_WARNING "ata%u: no sense translation for "
+ "error 0x%02x\n", id, drv_err);
}
- /* No immediate match */
- if (err)
- printk(KERN_DEBUG "ata%u: no sense translation for 0x%02x\n", qc->ap->id, err);
- i = 0;
/* Fall back to interpreting status bits */
- while (stat_table[i][0] != 0xFF) {
+ for (i = 0; stat_table[i][0] != 0xFF; i++) {
if (stat_table[i][0] & drv_stat) {
- sb[0] = 0x70;
- sb[2] = stat_table[i][1];
- sb[7] = 0x0a;
- sb[12] = stat_table[i][2];
- sb[13] = stat_table[i][3];
- return;
+ *sk = stat_table[i][1];
+ *asc = stat_table[i][2];
+ *ascq = stat_table[i][3];
+ goto translate_done;
}
- i++;
- }
- /* No error ?? */
- printk(KERN_ERR "ata%u: called with no error (%02X)!\n", qc->ap->id, drv_stat);
- /* additional-sense-code[-qualifier] */
-
- sb[0] = 0x70;
- sb[2] = MEDIUM_ERROR;
- sb[7] = 0x0A;
- if (cmd->sc_data_direction == SCSI_DATA_READ) {
- sb[12] = 0x11; /* "unrecovered read error" */
- sb[13] = 0x04;
- } else {
- sb[12] = 0x0C; /* "write error - */
- sb[13] = 0x02; /* auto-reallocation failed" */
}
+ /* No error? Undecoded? */
+ printk(KERN_WARNING "ata%u: no sense translation for status: 0x%02x\n",
+ id, drv_stat);
+
+ /* For our last chance pick, use medium read error because
+ * it's much more common than an ATA drive telling you a write
+ * has failed.
+ */
+ *sk = MEDIUM_ERROR;
+ *asc = 0x11; /* "unrecovered read error" */
+ *ascq = 0x04; /* "auto-reallocation failed" */
+
+ translate_done:
+ printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x to "
+ "SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n", id, drv_stat, drv_err,
+ *sk, *asc, *ascq);
+ return;
}
/*
- * ata_pass_thru_cc - Generate check condition sense block.
+ * ata_gen_ata_desc_sense - Generate check condition sense block.
* @qc: Command that completed.
*
- * Regardless of whether the command errored or not, return
- * a sense block. Copy all controller registers into
- * the sense block. Clear sense key, ASC & ASCQ if
- * there is no error.
+ * This function is specific to the ATA descriptor format sense
+ * block specified for the ATA pass through commands. Regardless
+ * of whether the command errored or not, return a sense
+ * block. Copy all controller registers into the sense
+ * block. Clear sense key, ASC & ASCQ if there is no error.
*
* LOCKING:
* spin_lock_irqsave(host_set lock)
*/
-void ata_pass_thru_cc(struct ata_queued_cmd *qc, u8 drv_stat)
+void ata_gen_ata_desc_sense(struct ata_queued_cmd *qc)
{
struct scsi_cmnd *cmd = qc->scsicmd;
struct ata_taskfile *tf = &qc->tf;
unsigned char *sb = cmd->sense_buffer;
unsigned char *desc = sb + 8;
+ memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
+
cmd->result = SAM_STAT_CHECK_CONDITION;
/*
+ * Read the controller registers.
+ */
+ assert(NULL != qc->ap->ops->tf_read);
+ qc->ap->ops->tf_read(qc->ap, tf);
+
+ /*
* Use ata_to_sense_error() to map status register bits
- * onto sense key, asc & ascq. We will overwrite some
- * (many) of the fields later.
- *
- * TODO: reorganise better, by splitting ata_to_sense_error()
+ * onto sense key, asc & ascq.
*/
- if (unlikely(drv_stat & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ))) {
- ata_to_sense_error(qc, drv_stat);
- } else {
- sb[3] = sb[2] = sb[1] = 0x00;
+ if (unlikely(tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ))) {
+ ata_to_sense_error(qc->ap->id, tf->command, tf->feature,
+ &sb[1], &sb[2], &sb[3]);
+ sb[1] &= 0x0f;
}
/*
- * Sense data is current and format is
- * descriptor.
+ * Sense data is current and format is descriptor.
*/
sb[0] = 0x72;
@@ -541,21 +542,16 @@ void ata_pass_thru_cc(struct ata_queued_
desc[1] = sb[7] = 14;
/*
- * Read the controller registers.
- */
- qc->ap->ops->tf_read(qc->ap, tf);
-
- /*
* Copy registers into sense buffer.
*/
desc[2] = 0x00;
- desc[3] = tf->feature; /* Note: becomes error register when read. */
+ desc[3] = tf->feature; /* == error reg */
desc[5] = tf->nsect;
desc[7] = tf->lbal;
desc[9] = tf->lbam;
desc[11] = tf->lbah;
desc[12] = tf->device;
- desc[13] = drv_stat;
+ desc[13] = tf->command; /* == status reg */
/*
* Fill in Extend bit, and the high order bytes
@@ -571,6 +567,54 @@ void ata_pass_thru_cc(struct ata_queued_
}
/**
+ * ata_gen_fixed_sense - generate a SCSI fixed sense block
+ * @qc: Command that we are erroring out
+ *
+ * Leverage ata_to_sense_error() to give us the codes. Fit our
+ * LBA in here if there's room.
+ *
+ * LOCKING:
+ * inherited from caller
+ */
+void ata_gen_fixed_sense(struct ata_queued_cmd *qc)
+{
+ struct scsi_cmnd *cmd = qc->scsicmd;
+ struct ata_taskfile *tf = &qc->tf;
+ unsigned char *sb = cmd->sense_buffer;
+
+ memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
+
+ cmd->result = SAM_STAT_CHECK_CONDITION;
+
+ /*
+ * Read the controller registers.
+ */
+ assert(NULL != qc->ap->ops->tf_read);
+ qc->ap->ops->tf_read(qc->ap, tf);
+
+ /*
+ * Use ata_to_sense_error() to map status register bits
+ * onto sense key, asc & ascq.
+ */
+ if (unlikely(tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ))) {
+ ata_to_sense_error(qc->ap->id, tf->command, tf->feature,
+ &sb[2], &sb[12], &sb[13]);
+ sb[2] &= 0x0f;
+ }
+
+ sb[0] = 0x70;
+ sb[7] = 0x0a;
+ if (tf->flags & ATA_TFLAG_LBA && !(tf->flags & ATA_TFLAG_LBA48)) {
+ /* A small (28b) LBA will fit in the 32b info field */
+ sb[0] |= 0x80; /* set valid bit */
+ sb[3] = tf->device & 0x0f;
+ sb[4] = tf->lbah;
+ sb[5] = tf->lbam;
+ sb[6] = tf->lbal;
+ }
+}
+
+/**
* ata_scsi_slave_config - Set SCSI device attributes
* @sdev: SCSI device to examine
*
@@ -946,23 +990,35 @@ static unsigned int ata_scsi_rw_xlat(str
static int ata_scsi_qc_complete(struct ata_queued_cmd *qc, u8 drv_stat)
{
struct scsi_cmnd *cmd = qc->scsicmd;
+ int need_sense = drv_stat & (ATA_ERR | ATA_BUSY | ATA_DRQ);
- /*
- * If this was a pass-thru command, and the user requested
- * a check condition return including register values.
- * Note that check condition is generated, and the ATA
- * register values are returned, whether the command completed
- * successfully or not. If there was no error, SK, ASC and
- * ASCQ will all be zero.
+ /* For ATA pass thru (SAT) commands, generate a sense block if
+ * user mandated it or if there's an error. Note that if we
+ * generate because the user forced us to, a check condition
+ * is generated and the ATA register values are returned
+ * whether the command completed successfully or not. If there
+ * was no error, SK, ASC and ASCQ will all be zero.
*/
if (((cmd->cmnd[0] == ATA_16) || (cmd->cmnd[0] == ATA_12)) &&
- (cmd->cmnd[2] & 0x20)) {
- ata_pass_thru_cc(qc, drv_stat);
+ ((cmd->cmnd[2] & 0x20) || need_sense)) {
+ ata_gen_ata_desc_sense(qc);
} else {
- if (unlikely(drv_stat & (ATA_ERR | ATA_BUSY | ATA_DRQ)))
- ata_to_sense_error(qc, drv_stat);
- else
+ if (!need_sense) {
cmd->result = SAM_STAT_GOOD;
+ } else {
+ /* TODO: decide which descriptor format to use
+ * for 48b LBA devices and call that here
+ * instead of the fixed desc, which is only
+ * good for smaller LBA (and maybe CHS?)
+ * devices.
+ */
+ ata_gen_fixed_sense(qc);
+ }
+ }
+
+ if (need_sense) {
+ /* The ata_gen_..._sense routines fill in tf */
+ ata_dump_status(qc->ap->id, &qc->tf);
}
qc->scsidone(cmd);
Index: libata-dev-2.6/drivers/scsi/libata.h
===================================================================
--- libata-dev-2.6.orig/drivers/scsi/libata.h 2005-03-17 01:33:26.000000000 -0500
+++ libata-dev-2.6/drivers/scsi/libata.h 2005-03-23 15:35:10.000000000 -0500
@@ -45,7 +45,6 @@ extern int ata_cmd_ioctl(struct scsi_dev
/* libata-scsi.c */
-extern void ata_to_sense_error(struct ata_queued_cmd *qc, u8 drv_stat);
extern int ata_scsi_error(struct Scsi_Host *host);
extern unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf,
unsigned int buflen);
-
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