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SubjectRe: [PATCH] 2.5.8 IDE 37
Tough I have made some progress in the adaptation of
the IDE-CD code to the new request handling introduced alognside
with the TCQ stuff it's still isn't read for public consumption.
Therefore:

Wed Apr 17 23:24:52 CEST 2002 ide-clean-39

Synchronize with Jens Axobe:

- Congruent ATA_AR_POOL fix to the ATA_AR_STATIC memmory corruption fix.

- Multi sector write handling fix.

- Fix drive capability deduction.

- Various other minor fixes.
diff -urN linux-2.5.8/drivers/ide/ide-dma.c linux/drivers/ide/ide-dma.c
--- linux-2.5.8/drivers/ide/ide-dma.c Wed Apr 17 23:09:19 2002
+++ linux/drivers/ide/ide-dma.c Wed Apr 17 23:28:22 2002
@@ -599,13 +599,19 @@
printk("%s: DMA disabled\n", drive->name);
case ide_dma_off_quietly:
set_high = 0;
- drive->using_tcq = 0;
outb(inb(dma_base+2) & ~(1<<(5+unit)), dma_base+2);
+#ifdef CONFIG_BLK_DEV_IDE_TCQ
+ hwif->dmaproc(ide_dma_queued_off, drive);
+#endif
case ide_dma_on:
ide_toggle_bounce(drive, set_high);
drive->using_dma = (func == ide_dma_on);
- if (drive->using_dma)
+ if (drive->using_dma) {
outb(inb(dma_base+2)|(1<<(5+unit)), dma_base+2);
+#ifdef CONFIG_BLK_DEV_IDE_TCQ_DEFAULT
+ hwif->dmaproc(ide_dma_queued_on, drive);
+#endif
+ }
return 0;
case ide_dma_check:
return config_drive_for_dma (drive);
diff -urN linux-2.5.8/drivers/ide/ide-taskfile.c linux/drivers/ide/ide-taskfile.c
--- linux-2.5.8/drivers/ide/ide-taskfile.c Wed Apr 17 23:22:53 2002
+++ linux/drivers/ide/ide-taskfile.c Wed Apr 17 23:28:22 2002
@@ -413,6 +413,20 @@
struct hd_driveid *id = drive->id;
u8 HIHI = (drive->addressing) ? 0xE0 : 0xEF;

+#if 0
+ printk("ata_taskfile ... %p\n", args->handler);
+
+ printk(" sector feature %02x\n", args->taskfile.feature);
+ printk(" sector count %02x\n", args->taskfile.sector_count);
+ printk(" drive/head %02x\n", args->taskfile.device_head);
+ printk(" command %02x\n", args->taskfile.command);
+
+ if (rq)
+ printk(" rq->nr_sectors %2li\n", rq->nr_sectors);
+ else
+ printk(" rq-> = null\n");
+#endif
+
/* (ks/hs): Moved to start, do not use for multiple out commands */
if (args->handler != task_mulout_intr) {
if (IDE_CONTROL_REG)
@@ -577,18 +591,22 @@
ata_read(drive, pBuf, SECTOR_WORDS);
ide_unmap_rq(rq, pBuf, &flags);

+ /*
+ * first segment of the request is complete. note that this does not
+ * necessarily mean that the entire request is done!! this is only
+ * true if ide_end_request() returns 0.
+ */
if (--rq->current_nr_sectors <= 0) {
- /* (hs): swapped next 2 lines */
DTF("Request Ended stat: %02x\n", GET_STAT());
- if (ide_end_request(drive, 1)) {
- ide_set_handler(drive, &task_in_intr, WAIT_CMD, NULL);
- return ide_started;
- }
- } else {
- ide_set_handler(drive, &task_in_intr, WAIT_CMD, NULL);
- return ide_started;
+ if (!ide_end_request(drive, 1))
+ return ide_stopped;
}
- return ide_stopped;
+
+ /*
+ * still data left to transfer
+ */
+ ide_set_handler(drive, &task_in_intr, WAIT_CMD, NULL);
+ return ide_started;
}

static ide_startstop_t pre_task_out_intr(ide_drive_t *drive, struct request *rq)
@@ -874,7 +892,6 @@
return;

case WIN_NOP:
-
args->command_type = IDE_DRIVE_TASK_NO_DATA;
return;

@@ -904,11 +921,6 @@
struct ata_request star;

ata_ar_init(drive, &star);
-
- /* Don't put this request on free_req list after usage.
- */
- star.ar_flags |= ATA_AR_STATIC;
-
init_taskfile_request(&rq);
rq.buffer = buf;

diff -urN linux-2.5.8/drivers/ide/ide-tcq.c linux/drivers/ide/ide-tcq.c
--- linux-2.5.8/drivers/ide/ide-tcq.c Wed Apr 17 23:09:14 2002
+++ linux/drivers/ide/ide-tcq.c Wed Apr 17 23:28:22 2002
@@ -51,21 +51,17 @@
*/
#undef IDE_TCQ_FIDDLE_SI

-/*
- * wait for data phase before starting DMA or not
- */
-#undef IDE_TCQ_WAIT_DATAPHASE
-
ide_startstop_t ide_dmaq_intr(ide_drive_t *drive);
ide_startstop_t ide_service(ide_drive_t *drive);

static inline void drive_ctl_nien(ide_drive_t *drive, int clear)
{
#ifdef IDE_TCQ_NIEN
- int mask = clear ? 0x00 : 0x02;
+ if (IDE_CONTROL_REG) {
+ int mask = clear ? 0x00 : 0x02;

- if (IDE_CONTROL_REG)
OUT_BYTE(drive->ctl | mask, IDE_CONTROL_REG);
+ }
#endif
}

@@ -123,7 +119,6 @@
init_taskfile_request(ar->ar_rq);
ar->ar_rq->rq_dev = mk_kdev(drive->channel->major, (drive->select.b.unit)<<PARTN_BITS);
ar->ar_rq->special = ar;
- ar->ar_flags |= ATA_AR_RETURN;
_elv_add_request(q, ar->ar_rq, 0, 0);

/*
@@ -222,7 +217,7 @@
{
struct ata_request *ar;
byte feat, stat;
- int tag;
+ int tag, ret;

TCQ_PRINTK("%s: started service\n", drive->name);

@@ -272,9 +267,6 @@
return ide_stopped;
}

- /*
- * start dma
- */
tag = feat >> 3;
IDE_SET_CUR_TAG(drive, tag);

@@ -293,16 +285,16 @@
*/
if (rq_data_dir(ar->ar_rq) == READ) {
TCQ_PRINTK("ide_service: starting READ %x\n", stat);
- drive->channel->dmaproc(ide_dma_read_queued, drive);
+ ret = drive->channel->dmaproc(ide_dma_read_queued, drive);
} else {
TCQ_PRINTK("ide_service: starting WRITE %x\n", stat);
- drive->channel->dmaproc(ide_dma_write_queued, drive);
+ ret = drive->channel->dmaproc(ide_dma_write_queued, drive);
}

/*
* dmaproc set intr handler
*/
- return ide_started;
+ return !ret ? ide_started : ide_stopped;
}

ide_startstop_t ide_check_service(ide_drive_t *drive)
@@ -410,14 +402,15 @@
*/
static int ide_tcq_configure(ide_drive_t *drive)
{
+ int tcq_mask = 1 << 1 | 1 << 14;
+ int tcq_bits = tcq_mask | 1 << 15;
struct ata_taskfile args;
- int tcq_supp = 1 << 1 | 1 << 14;

/*
* bit 14 and 1 must be set in word 83 of the device id to indicate
- * support for dma queued protocol
+ * support for dma queued protocol, and bit 15 must be cleared
*/
- if ((drive->id->command_set_2 & tcq_supp) != tcq_supp)
+ if ((drive->id->command_set_2 & tcq_bits) ^ tcq_mask)
return -EIO;

memset(&args, 0, sizeof(args));
@@ -477,11 +470,14 @@
*/
static int ide_enable_queued(ide_drive_t *drive, int on)
{
+ int depth = drive->using_tcq ? drive->queue_depth : 0;
+
/*
* disable or adjust queue depth
*/
if (!on) {
- printk("%s: TCQ disabled\n", drive->name);
+ if (drive->using_tcq)
+ printk("%s: TCQ disabled\n", drive->name);
drive->using_tcq = 0;
return 0;
}
@@ -491,25 +487,33 @@
return 1;
}

+ /*
+ * possibly expand command list
+ */
if (ide_build_commandlist(drive))
return 1;

- printk("%s: tagged command queueing enabled, command queue depth %d\n", drive->name, drive->queue_depth);
+ if (depth != drive->queue_depth)
+ printk("%s: tagged command queueing enabled, command queue depth %d\n", drive->name, drive->queue_depth);
+
drive->using_tcq = 1;
+
+ /*
+ * clear stats
+ */
drive->tcq->max_depth = 0;
return 0;
}

int ide_tcq_wait_dataphase(ide_drive_t *drive)
{
-#ifdef IDE_TCQ_WAIT_DATAPHASE
ide_startstop_t foo;

- if (ide_wait_stat(&startstop, drive, READY_STAT | DRQ_STAT, BUSY_STAT, WAIT_READY)) {
+ if (ide_wait_stat(&foo, drive, READY_STAT | DRQ_STAT, BUSY_STAT, WAIT_READY)) {
printk("%s: timeout waiting for data phase\n", drive->name);
return 1;
}
-#endif
+
return 0;
}

@@ -595,6 +599,8 @@
if (ide_start_dma(hwif, drive, func))
return ide_stopped;

+ TCQ_PRINTK("IMMED in queued_start\n");
+
/*
* need to arm handler before starting dma engine,
* transfer could complete right away
@@ -612,6 +618,8 @@
case ide_dma_queued_off:
enable_tcq = 0;
case ide_dma_queued_on:
+ if (enable_tcq && !drive->using_dma)
+ return 1;
return ide_enable_queued(drive, enable_tcq);
default:
break;
diff -urN linux-2.5.8/drivers/ide/ide.c linux/drivers/ide/ide.c
--- linux-2.5.8/drivers/ide/ide.c Wed Apr 17 23:22:53 2002
+++ linux/drivers/ide/ide.c Wed Apr 17 23:28:22 2002
@@ -803,8 +803,7 @@
args->hobfile.high_cylinder = IN_BYTE(IDE_HCYL_REG);
}
}
- if (ar->ar_flags & ATA_AR_RETURN)
- ata_ar_put(drive, ar);
+ ata_ar_put(drive, ar);
}

blkdev_dequeue_request(rq);
diff -urN linux-2.5.8/include/linux/ide.h linux/include/linux/ide.h
--- linux-2.5.8/include/linux/ide.h Wed Apr 17 23:22:53 2002
+++ linux/include/linux/ide.h Wed Apr 17 23:30:30 2002
@@ -968,10 +968,9 @@
/*
* ata_request flag bits
*/
-#define ATA_AR_QUEUED 1
-#define ATA_AR_SETUP 2
-#define ATA_AR_RETURN 4
-#define ATA_AR_STATIC 8
+#define ATA_AR_QUEUED 1 /* was queued */
+#define ATA_AR_SETUP 2 /* dma table mapped */
+#define ATA_AR_POOL 4 /* originated from drive pool */

/*
* if turn-around time is longer than this, halve queue depth
@@ -1003,8 +1002,10 @@

if (!list_empty(&drive->free_req)) {
ar = list_ata_entry(drive->free_req.next);
+
list_del(&ar->ar_queue);
ata_ar_init(drive, ar);
+ ar->ar_flags |= ATA_AR_POOL;
}

return ar;
@@ -1012,8 +1013,8 @@

static inline void ata_ar_put(ide_drive_t *drive, struct ata_request *ar)
{
- if (!(ar->ar_flags & ATA_AR_STATIC))
- list_add(&ar->ar_queue, &drive->free_req);
+ if (ar->ar_flags & ATA_AR_POOL)
+ list_add(&ar->ar_queue, &drive->free_req);

if (ar->ar_flags & ATA_AR_QUEUED) {
/* clear the tag */
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