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Date: Fri, 07 Dec 2007 19:34:26 +0300 From: Sergei Shtylyov <sshtylyov@...mvista.com> To: Bartlomiej Zolnierkiewicz <bzolnier@...il.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 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? > + 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"? > + else > + s = "XFER ERROR"; > + > + return s; > } MBR, Sergei -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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