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Message-Id: <200712091644.03448.bzolnier@gmail.com>
Date: Sun, 9 Dec 2007 16:44:03 +0100
From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To: Sergei Shtylyov <sshtylyov@...mvista.com>
Cc: Randy Dunlap <randy.dunlap@...cle.com>, Mark Lord <lkml@....ca>,
Nick Warne <nick@...sn.org>, linux-kernel@...r.kernel.org,
linux-ide@...r.kernel.org
Subject: Re: Peculiar out-of-sync boot log lines
Hi,
On Friday 07 December 2007, Sergei Shtylyov wrote:
> Hello.
>
> Bartlomiej Zolnierkiewicz wrote:
>
> > [PATCH] ide: DMA reporting and validity checking fixes (take 2)
>
> > * ide_xfer_verbose() fixups:
> > - beautify returned mode names
> > - fix PIO5 reporting
> > - make it return 'const char *'
>
> > * Change printk() level from KERN_DEBUG to KERN_INFO in ide_find_dma_mode().
>
> > * Add ide_id_dma_bug() helper based on ide_dma_verbose() to check for invalid
> > DMA info in identify block.
>
> > * Use ide_id_dma_bug() in ide_tune_dma() and ide_driveid_update().
>
> > As a result DMA won't be tuned or will be disabled after tuning if device
> > reports inconsistent info about enabled DMA mode (ide_dma_verbose() does the
> > same checks while the IDE device is probed by ide-{cd,disk} device driver).
>
> > * Since (id->capability & 1) && id->tDMA is a valid configuration handle
> > it correctly in ide_id_dma_bug().
>
> Huh? You don't check (id->capability & 1) there...
>
> > * Remove no longer needed ide_dma_verbose().
>
> > This patch should fix the following problem with out-of-sync IDE messages
> > reported by Nick Warne:
>
> > hdd: ATAPI 48X DVD-ROM DVD-R-RAM CD-R/RW drive, 2048kB Cache<7>hdd:
> > skipping word 93 validity check
> > , UDMA(66)
>
> > and later debugged by Mark Lord to be caused by:
>
> > ide_dma_verbose()
> > printk( ... "2048kB Cache");
> > eighty_ninty_three()
> > printk(KERN_DEBUG "%s: skipping word 93 validity check\n");
> > ide_dma_verbose()
> > printk(", UDMA(66)"
>
> > Please note that as a result ide-{cd,disk} device drivers won't report the
> > DMA speed used but this is intended since now DMA mode being used is always
> > reported by IDE core code.
>
> > v2:
> > * fixes suggested by Randy:
> > - use KERN_CONT for printk()-s in ide-{cd,disk}.c
> > - don't remove argument name from ide_xfer_verbose() declaration
>
> > Cc: Nick Warne <nick@...sn.org>
> > Cc: Mark Lord <lkml@....ca>
> > Cc: Randy Dunlap <randy.dunlap@...cle.com>
> > Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
>
> [...]
>
> > Index: b/drivers/ide/ide-dma.c
> > ===================================================================
> > --- a/drivers/ide/ide-dma.c
> > +++ b/drivers/ide/ide-dma.c
> > @@ -806,58 +809,26 @@ static int ide_dma_check(ide_drive_t *dr
> > return vdma ? 0 : -1;
> > }
> >
> > -void ide_dma_verbose(ide_drive_t *drive)
> > +int ide_id_dma_bug(ide_drive_t *drive)
> > {
> > - struct hd_driveid *id = drive->id;
> > - ide_hwif_t *hwif = HWIF(drive);
> > + struct hd_driveid *id = drive->id;
> >
> > if (id->field_valid & 4) {
> > if ((id->dma_ultra >> 8) && (id->dma_mword >> 8))
> [...]
> > + goto err_out;
> > } else if (id->field_valid & 2) {
> > if ((id->dma_mword >> 8) && (id->dma_1word >> 8))
> > - goto bug_dma_off;
> > - printk(", DMA");
> > + goto err_out;
> > } else if (id->field_valid & 1) {
>
> Hm, bit 0 only gurantees that current translation
>
> > - goto bug_dma_off;
> > + if (id->tDMA == 0)
>
> Despite the name, this is not a transfer period but SW DMA mode number, so
> why mode 0 is bad?
Thanks for checking the patch, I must have been half asleep while coding
this part cause it is completely bogus!
[ Well, it is not like that the code was OK before my changes... ;-) ]
I just removed incorrect (id->field_valid & 1) check in 'take 3'.
> > + goto err_out;
> > }
> > - return;
> > -bug_dma_off:
> > - printk(", BUG DMA OFF");
> > - hwif->dma_off_quietly(drive);
> > - return;
> > + return 0;
> > +err_out:
> > + printk(KERN_ERR "%s: bad DMA info in identify block\n", drive->name);
> > + return 1;
> > }
> >
> > Index: b/drivers/ide/ide-lib.c
> > ===================================================================
> > --- a/drivers/ide/ide-lib.c
> > +++ b/drivers/ide/ide-lib.c
> > @@ -29,41 +29,44 @@
> > * Add common non I/O op stuff here. Make sure it has proper
> > * kernel-doc function headers or your patch will be rejected
> > */
> > -
> > +
> > +static const char *udma_str[] =
> > + { "UDMA/16", "UDMA/25", "UDMA/33", "UDMA/44",
> > + "UDMA/66", "UDMA/100", "UDMA/133", "UDMA7" };
> > +static const char *mwdma_str[] =
> > + { "MWDMA0", "MWDMA1", "MWDMA2" };
> > +static const char *swdma_str[] =
> > + { "SWDMA0", "SWDMA1", "SWDMA2" };
> > +static const char *pio_str[] =
> > + { "PIO0", "PIO1", "PIO2", "PIO3", "PIO4", "PIO5" };
> >
> > /**
> > * ide_xfer_verbose - return IDE mode names
> > - * @xfer_rate: rate to name
> > + * @mode: transfer mode
> > *
> > * Returns a constant string giving the name of the mode
> > * requested.
> > */
> >
> > -char *ide_xfer_verbose (u8 xfer_rate)
> > +const char *ide_xfer_verbose(u8 mode)
> > {
> [...]
> > + const char *s;
> > + u8 i = mode & 0xf;
> > +
> > + if (mode >= XFER_UDMA_0 && mode <= XFER_UDMA_7)
> > + s = udma_str[i];
> > + else if (mode >= XFER_MW_DMA_0 && mode <= XFER_MW_DMA_2)
> > + s = mwdma_str[i];
> > + else if (mode >= XFER_SW_DMA_0 && mode <= XFER_SW_DMA_2)
> > + s = swdma_str[i];
> > + else if (mode >= XFER_PIO_0 && mode <= XFER_PIO_5)
> > + s = pio_str[i & 0x7];
> > + else if (mode == XFER_PIO_SLOW)
> > + s = "XFER SLOW";
>
> Not "PIO SLOW"?
fixed
While going through the patch I've noticed that ide_find_dma_mode() could
report the wrong mode for user requested and "CRC slow-down" speed changes,
this is also fixed now.
[PATCH] ide: DMA reporting and validity checking fixes (take 3)
* ide_xfer_verbose() fixups:
- beautify returned mode names
- fix PIO5 reporting
- make it return 'const char *'
* Change printk() level from KERN_DEBUG to KERN_INFO in ide_find_dma_mode().
* Add ide_id_dma_bug() helper based on ide_dma_verbose() to check for invalid
DMA info in identify block.
* Use ide_id_dma_bug() in ide_tune_dma() and ide_driveid_update().
As a result DMA won't be tuned or will be disabled after tuning if device
reports inconsistent info about enabled DMA mode (ide_dma_verbose() does the
same checks while the IDE device is probed by ide-{cd,disk} device driver).
* Remove no longer needed ide_dma_verbose().
This patch should fix the following problem with out-of-sync IDE messages
reported by Nick Warne:
hdd: ATAPI 48X DVD-ROM DVD-R-RAM CD-R/RW drive, 2048kB Cache<7>hdd:
skipping word 93 validity check
, UDMA(66)
and later debugged by Mark Lord to be caused by:
ide_dma_verbose()
printk( ... "2048kB Cache");
eighty_ninty_three()
printk(KERN_DEBUG "%s: skipping word 93 validity check\n");
ide_dma_verbose()
printk(", UDMA(66)"
Please note that as a result ide-{cd,disk} device drivers won't report the
DMA speed used but this is intended since now DMA mode being used is always
reported by IDE core code.
v2:
* fixes suggested by Randy:
- use KERN_CONT for printk()-s in ide-{cd,disk}.c
- don't remove argument name from ide_xfer_verbose() declaration
v3:
* Remove incorrect check for (id->field_valid & 1) from ide_id_dma_bug()
(spotted by Sergei).
* "XFER SLOW" -> "PIO SLOW" in ide_xfer_verbose() (suggested by Sergei).
* Fix ide_find_dma_mode() to report the correct mode ('mode' after being
limited by 'req_mode').
Cc: Sergei Shtylyov <sshtylyov@...mvista.com>
Cc: Nick Warne <nick@...sn.org>
Cc: Mark Lord <lkml@....ca>
Cc: Randy Dunlap <randy.dunlap@...cle.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
---
drivers/ide/ide-cd.c | 7 -----
drivers/ide/ide-disk.c | 7 +----
drivers/ide/ide-dma.c | 60 ++++++++++++-------------------------------------
drivers/ide/ide-iops.c | 3 ++
drivers/ide/ide-lib.c | 55 +++++++++++++++++++++++---------------------
include/linux/ide.h | 6 ++--
6 files changed, 53 insertions(+), 85 deletions(-)
Index: b/drivers/ide/ide-cd.c
===================================================================
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -3049,12 +3049,7 @@ int ide_cdrom_probe_capabilities (ide_dr
else
printk(" drive");
- printk(", %dkB Cache", be16_to_cpu(cap.buffer_size));
-
- if (drive->using_dma)
- ide_dma_verbose(drive);
-
- printk("\n");
+ printk(KERN_CONT ", %dkB Cache\n", be16_to_cpu(cap.buffer_size));
return nslots;
}
Index: b/drivers/ide/ide-disk.c
===================================================================
--- a/drivers/ide/ide-disk.c
+++ b/drivers/ide/ide-disk.c
@@ -961,11 +961,8 @@ static void idedisk_setup (ide_drive_t *
if (id->buf_size)
printk (" w/%dKiB Cache", id->buf_size/2);
- printk(", CHS=%d/%d/%d",
- drive->bios_cyl, drive->bios_head, drive->bios_sect);
- if (drive->using_dma)
- ide_dma_verbose(drive);
- printk("\n");
+ printk(KERN_CONT ", CHS=%d/%d/%d\n",
+ drive->bios_cyl, drive->bios_head, drive->bios_sect);
/* write cache enabled? */
if ((id->csfo & 1) || (id->cfs_enable_1 & (1 << 5)))
Index: b/drivers/ide/ide-dma.c
===================================================================
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -753,10 +753,12 @@ u8 ide_find_dma_mode(ide_drive_t *drive,
mode = XFER_MW_DMA_1;
}
- printk(KERN_DEBUG "%s: %s mode selected\n", drive->name,
+ mode = min(mode, req_mode);
+
+ printk(KERN_INFO "%s: %s mode selected\n", drive->name,
mode ? ide_xfer_verbose(mode) : "no DMA");
- return min(mode, req_mode);
+ return mode;
}
EXPORT_SYMBOL_GPL(ide_find_dma_mode);
@@ -772,6 +774,9 @@ static int ide_tune_dma(ide_drive_t *dri
if (__ide_dma_bad_drive(drive))
return 0;
+ if (ide_id_dma_bug(drive))
+ return 0;
+
if (drive->hwif->host_flags & IDE_HFLAG_TRUST_BIOS_FOR_DMA)
return config_drive_for_dma(drive);
@@ -806,58 +811,23 @@ static int ide_dma_check(ide_drive_t *dr
return vdma ? 0 : -1;
}
-void ide_dma_verbose(ide_drive_t *drive)
+int ide_id_dma_bug(ide_drive_t *drive)
{
- struct hd_driveid *id = drive->id;
- ide_hwif_t *hwif = HWIF(drive);
+ struct hd_driveid *id = drive->id;
if (id->field_valid & 4) {
if ((id->dma_ultra >> 8) && (id->dma_mword >> 8))
- goto bug_dma_off;
- if (id->dma_ultra & ((id->dma_ultra >> 8) & hwif->ultra_mask)) {
- if (((id->dma_ultra >> 11) & 0x1F) &&
- eighty_ninty_three(drive)) {
- if ((id->dma_ultra >> 15) & 1) {
- printk(", UDMA(mode 7)");
- } else if ((id->dma_ultra >> 14) & 1) {
- printk(", UDMA(133)");
- } else if ((id->dma_ultra >> 13) & 1) {
- printk(", UDMA(100)");
- } else if ((id->dma_ultra >> 12) & 1) {
- printk(", UDMA(66)");
- } else if ((id->dma_ultra >> 11) & 1) {
- printk(", UDMA(44)");
- } else
- goto mode_two;
- } else {
- mode_two:
- if ((id->dma_ultra >> 10) & 1) {
- printk(", UDMA(33)");
- } else if ((id->dma_ultra >> 9) & 1) {
- printk(", UDMA(25)");
- } else if ((id->dma_ultra >> 8) & 1) {
- printk(", UDMA(16)");
- }
- }
- } else {
- printk(", (U)DMA"); /* Can be BIOS-enabled! */
- }
+ goto err_out;
} else if (id->field_valid & 2) {
if ((id->dma_mword >> 8) && (id->dma_1word >> 8))
- goto bug_dma_off;
- printk(", DMA");
- } else if (id->field_valid & 1) {
- goto bug_dma_off;
+ goto err_out;
}
- return;
-bug_dma_off:
- printk(", BUG DMA OFF");
- hwif->dma_off_quietly(drive);
- return;
+ return 0;
+err_out:
+ printk(KERN_ERR "%s: bad DMA info in identify block\n", drive->name);
+ return 1;
}
-EXPORT_SYMBOL(ide_dma_verbose);
-
int ide_set_dma(ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
Index: b/drivers/ide/ide-iops.c
===================================================================
--- a/drivers/ide/ide-iops.c
+++ b/drivers/ide/ide-iops.c
@@ -748,6 +748,9 @@ int ide_driveid_update(ide_drive_t *driv
drive->id->dma_1word = id->dma_1word;
/* anything more ? */
kfree(id);
+
+ if (drive->using_dma && ide_id_dma_bug(drive))
+ ide_dma_off(drive);
}
return 1;
Index: b/drivers/ide/ide-lib.c
===================================================================
--- a/drivers/ide/ide-lib.c
+++ b/drivers/ide/ide-lib.c
@@ -29,41 +29,44 @@
* Add common non I/O op stuff here. Make sure it has proper
* kernel-doc function headers or your patch will be rejected
*/
-
+
+static const char *udma_str[] =
+ { "UDMA/16", "UDMA/25", "UDMA/33", "UDMA/44",
+ "UDMA/66", "UDMA/100", "UDMA/133", "UDMA7" };
+static const char *mwdma_str[] =
+ { "MWDMA0", "MWDMA1", "MWDMA2" };
+static const char *swdma_str[] =
+ { "SWDMA0", "SWDMA1", "SWDMA2" };
+static const char *pio_str[] =
+ { "PIO0", "PIO1", "PIO2", "PIO3", "PIO4", "PIO5" };
/**
* ide_xfer_verbose - return IDE mode names
- * @xfer_rate: rate to name
+ * @mode: transfer mode
*
* Returns a constant string giving the name of the mode
* requested.
*/
-char *ide_xfer_verbose (u8 xfer_rate)
+const char *ide_xfer_verbose(u8 mode)
{
- switch(xfer_rate) {
- case XFER_UDMA_7: return("UDMA 7");
- case XFER_UDMA_6: return("UDMA 6");
- case XFER_UDMA_5: return("UDMA 5");
- case XFER_UDMA_4: return("UDMA 4");
- case XFER_UDMA_3: return("UDMA 3");
- case XFER_UDMA_2: return("UDMA 2");
- case XFER_UDMA_1: return("UDMA 1");
- case XFER_UDMA_0: return("UDMA 0");
- case XFER_MW_DMA_2: return("MW DMA 2");
- case XFER_MW_DMA_1: return("MW DMA 1");
- case XFER_MW_DMA_0: return("MW DMA 0");
- case XFER_SW_DMA_2: return("SW DMA 2");
- case XFER_SW_DMA_1: return("SW DMA 1");
- case XFER_SW_DMA_0: return("SW DMA 0");
- case XFER_PIO_4: return("PIO 4");
- case XFER_PIO_3: return("PIO 3");
- case XFER_PIO_2: return("PIO 2");
- case XFER_PIO_1: return("PIO 1");
- case XFER_PIO_0: return("PIO 0");
- case XFER_PIO_SLOW: return("PIO SLOW");
- default: return("XFER ERROR");
- }
+ const char *s;
+ u8 i = mode & 0xf;
+
+ if (mode >= XFER_UDMA_0 && mode <= XFER_UDMA_7)
+ s = udma_str[i];
+ else if (mode >= XFER_MW_DMA_0 && mode <= XFER_MW_DMA_2)
+ s = mwdma_str[i];
+ else if (mode >= XFER_SW_DMA_0 && mode <= XFER_SW_DMA_2)
+ s = swdma_str[i];
+ else if (mode >= XFER_PIO_0 && mode <= XFER_PIO_5)
+ s = pio_str[i & 0x7];
+ else if (mode == XFER_PIO_SLOW)
+ s = "PIO SLOW";
+ else
+ s = "XFER ERROR";
+
+ return s;
}
EXPORT_SYMBOL(ide_xfer_verbose);
Index: b/include/linux/ide.h
===================================================================
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -1255,6 +1255,7 @@ int ide_in_drive_list(struct hd_driveid
#ifdef CONFIG_BLK_DEV_IDEDMA
int __ide_dma_bad_drive(ide_drive_t *);
+int ide_id_dma_bug(ide_drive_t *);
u8 ide_find_dma_mode(ide_drive_t *, u8);
@@ -1264,7 +1265,6 @@ static inline u8 ide_max_dma_mode(ide_dr
}
void ide_dma_off(ide_drive_t *);
-void ide_dma_verbose(ide_drive_t *);
int ide_set_dma(ide_drive_t *);
ide_startstop_t ide_dma_intr(ide_drive_t *);
@@ -1287,6 +1287,7 @@ extern void ide_dma_timeout(ide_drive_t
#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
#else
+static inline int ide_id_dma_bug(ide_drive_t *drive) { return 0; }
static inline u8 ide_find_dma_mode(ide_drive_t *drive, u8 speed) { return 0; }
static inline u8 ide_max_dma_mode(ide_drive_t *drive) { return 0; }
static inline void ide_dma_off(ide_drive_t *drive) { ; }
@@ -1333,8 +1334,7 @@ static inline void ide_set_hwifdata (ide
hwif->hwif_data = data;
}
-/* ide-lib.c */
-extern char *ide_xfer_verbose(u8 xfer_rate);
+const char *ide_xfer_verbose(u8 mode);
extern void ide_toggle_bounce(ide_drive_t *drive, int on);
extern int ide_set_xfer_rate(ide_drive_t *drive, u8 rate);
--
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