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Message-ID: <alpine.LNX.2.00.1511191505080.13423@nippy.intranet>
Date: Thu, 19 Nov 2015 15:05:58 +1100 (AEDT)
From: Finn Thain <fthain@...egraphics.com.au>
To: Michael Schmitz <schmitzmic@...il.com>
cc: "James E.J. Bottomley" <JBottomley@...n.com>,
linux-m68k@...r.kernel.org, linux-scsi@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/71] atari_NCR5380: Remove RESET_BOOT,
CONFIG_ATARI_SCSI_TOSHIBA_DELAY and CONFIG_ATARI_SCSI_RESET_BOOT
w
On Thu, 19 Nov 2015, Michael Schmitz wrote:
> Hi Finn,
>
> Am 18.11.2015 um 21:35 schrieb Finn Thain:
>
> > The bus reset may raise an interrupt. That would be new behaviour for
> > atari_scsi only when CONFIG_ATARI_SCSI_RESET_BOOT=n. The ST DMA
> > interrupt is not assigned to atari_scsi at this stage, so
> > CONFIG_ATARI_SCSI_RESET_BOOT=y may well be problematic already.
>
> I can confirm that the bus reset at boot has never been problematic in
> the past. It's been enabled in my kernels as long as I've used the
> driver (must be getting close to 20 years now).
That's good to know. I'm not sure why it was configurable in the first
place (long delays?). The new algorithm (the one I copied from NCR5380.c)
does not allow the user to prevent a possible scsi bus reset at driver
init time. The scsi bus reset only takes place if the driver discovers
that the bus was already wedged when it started. (It proved useful when I
was introducing faults for EH testing, BTW.)
--
>
> Cheers,
>
>
> Michael
>
>
> > Regardless, do_reset() now raises and clears the interrupt within
> > local_irq_save/restore which should avoid problems.
> >
> > Signed-off-by: Finn Thain <fthain@...egraphics.com.au>
> >
> > ---
> > drivers/scsi/Kconfig | 17 -----------
> > drivers/scsi/NCR5380.c | 17 +++++++++--
> > drivers/scsi/NCR5380.h | 1
> > drivers/scsi/atari_NCR5380.c | 22 +++++++++-----
> > drivers/scsi/atari_scsi.c | 60 +++++----------------------------------
> > drivers/scsi/mac_scsi.c | 65 ++++++-------------------------------------
> > drivers/scsi/sun3_scsi.c | 47 -------------------------------
> > 7 files changed, 51 insertions(+), 178 deletions(-)
> >
> > Index: linux/drivers/scsi/Kconfig
> > ===================================================================
> > --- linux.orig/drivers/scsi/Kconfig 2015-11-18 19:25:56.000000000 +1100
> > +++ linux/drivers/scsi/Kconfig 2015-11-18 19:33:15.000000000 +1100
> > @@ -1624,23 +1624,6 @@ config ATARI_SCSI
> > ST-DMA, replacing ACSI). It does NOT support other schemes, like
> > in the Hades (without DMA).
> >
> > -config ATARI_SCSI_TOSHIBA_DELAY
> > - bool "Long delays for Toshiba CD-ROMs"
> > - depends on ATARI_SCSI
> > - help
> > - This option increases the delay after a SCSI arbitration to
> > - accommodate some flaky Toshiba CD-ROM drives. Say Y if you intend to
> > - use a Toshiba CD-ROM drive; otherwise, the option is not needed and
> > - would impact performance a bit, so say N.
> > -
> > -config ATARI_SCSI_RESET_BOOT
> > - bool "Reset SCSI-devices at boottime"
> > - depends on ATARI_SCSI
> > - help
> > - Reset the devices on your Atari whenever it boots. This makes the
> > - boot process fractionally longer but may assist recovery from errors
> > - that leave the devices with SCSI operations partway completed.
> > -
> > config MAC_SCSI
> > tristate "Macintosh NCR5380 SCSI"
> > depends on MAC && SCSI=y
> > Index: linux/drivers/scsi/atari_NCR5380.c
> > ===================================================================
> > --- linux.orig/drivers/scsi/atari_NCR5380.c 2015-11-18 19:33:13.000000000 +1100
> > +++ linux/drivers/scsi/atari_NCR5380.c 2015-11-18 19:33:15.000000000 +1100
> > @@ -674,13 +674,14 @@ static void prepare_info(struct Scsi_Hos
> > "base 0x%lx, irq %d, "
> > "can_queue %d, cmd_per_lun %d, "
> > "sg_tablesize %d, this_id %d, "
> > - "flags { %s}, "
> > + "flags { %s%s}, "
> > "options { %s} ",
> > instance->hostt->name, instance->io_port, instance->n_io_port,
> > instance->base, instance->irq,
> > instance->can_queue, instance->cmd_per_lun,
> > instance->sg_tablesize, instance->this_id,
> > hostdata->flags & FLAG_TAGGED_QUEUING ? "TAGGED_QUEUING " : "",
> > + hostdata->flags & FLAG_TOSHIBA_DELAY ? "TOSHIBA_DELAY " : "",
> > #ifdef DIFFERENTIAL
> > "DIFFERENTIAL "
> > #endif
> > @@ -860,6 +861,7 @@ static int __init NCR5380_init(struct Sc
> >
> > static int NCR5380_maybe_reset_bus(struct Scsi_Host *instance)
> > {
> > + struct NCR5380_hostdata *hostdata = shost_priv(instance);
> > int pass;
> >
> > for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) {
> > @@ -878,6 +880,14 @@ static int NCR5380_maybe_reset_bus(struc
> > case 4:
> > shost_printk(KERN_ERR, instance, "bus busy, attempting reset\n");
> > do_reset(instance);
> > + /* Wait after a reset; the SCSI standard calls for
> > + * 250ms, we wait 500ms to be on the safe side.
> > + * But some Toshiba CD-ROMs need ten times that.
> > + */
> > + if (hostdata->flags & FLAG_TOSHIBA_DELAY)
> > + msleep(2500);
> > + else
> > + msleep(500);
> > break;
> > case 6:
> > shost_printk(KERN_ERR, instance, "bus locked solid\n");
> > @@ -1493,12 +1503,10 @@ static int NCR5380_select(struct Scsi_Ho
> > * a minimum so we'll udelay ceil(1.2)
> > */
> >
> > -#ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
> > - /* ++roman: But some targets (see above :-) seem to need a bit more... */
> > - udelay(15);
> > -#else
> > - udelay(2);
> > -#endif
> > + if (hostdata->flags & FLAG_TOSHIBA_DELAY)
> > + udelay(15);
> > + else
> > + udelay(2);
> >
> > if (hostdata->connected) {
> > NCR5380_write(MODE_REG, MR_BASE);
> > Index: linux/drivers/scsi/atari_scsi.c
> > ===================================================================
> > --- linux.orig/drivers/scsi/atari_scsi.c 2015-11-18 19:32:58.000000000 +1100
> > +++ linux/drivers/scsi/atari_scsi.c 2015-11-18 19:33:15.000000000 +1100
> > @@ -164,15 +164,6 @@ static inline unsigned long SCSI_DMA_GET
> > #define HOSTDATA_DMALEN (((struct NCR5380_hostdata *) \
> > (atari_scsi_host->hostdata))->dma_len)
> >
> > -/* Time (in jiffies) to wait after a reset; the SCSI standard calls for 250ms,
> > - * we usually do 0.5s to be on the safe side. But Toshiba CD-ROMs once more
> > - * need ten times the standard value... */
> > -#ifndef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
> > -#define AFTER_RESET_DELAY (HZ/2)
> > -#else
> > -#define AFTER_RESET_DELAY (5*HZ/2)
> > -#endif
> > -
> > #ifdef REAL_DMA
> > static void atari_scsi_fetch_restbytes(void);
> > #endif
> > @@ -208,12 +199,12 @@ static int setup_cmd_per_lun = -1;
> > module_param(setup_cmd_per_lun, int, 0);
> > static int setup_sg_tablesize = -1;
> > module_param(setup_sg_tablesize, int, 0);
> > -#ifdef SUPPORT_TAGS
> > static int setup_use_tagged_queuing = -1;
> > module_param(setup_use_tagged_queuing, int, 0);
> > -#endif
> > static int setup_hostid = -1;
> > module_param(setup_hostid, int, 0);
> > +static int setup_toshiba_delay = -1;
> > +module_param(setup_toshiba_delay, int, 0);
> >
> >
> > #if defined(REAL_DMA)
> > @@ -488,7 +479,7 @@ static int __init atari_scsi_setup(char
> > * Defaults depend on TT or Falcon, determined at run time.
> > * Negative values mean don't change.
> > */
> > - int ints[6];
> > + int ints[8];
> >
> > get_options(str, ARRAY_SIZE(ints), ints);
> >
> > @@ -504,10 +495,11 @@ static int __init atari_scsi_setup(char
> > setup_sg_tablesize = ints[3];
> > if (ints[0] >= 4)
> > setup_hostid = ints[4];
> > -#ifdef SUPPORT_TAGS
> > if (ints[0] >= 5)
> > setup_use_tagged_queuing = ints[5];
> > -#endif
> > + /* ints[6] (use_pdma) is ignored */
> > + if (ints[0] >= 7)
> > + setup_toshiba_delay = ints[7];
> >
> > return 1;
> > }
> > @@ -516,38 +508,6 @@ __setup("atascsi=", atari_scsi_setup);
> > #endif /* !MODULE */
> >
> >
> > -#ifdef CONFIG_ATARI_SCSI_RESET_BOOT
> > -static void __init atari_scsi_reset_boot(void)
> > -{
> > - unsigned long end;
> > -
> > - /*
> > - * Do a SCSI reset to clean up the bus during initialization. No messing
> > - * with the queues, interrupts, or locks necessary here.
> > - */
> > -
> > - printk("Atari SCSI: resetting the SCSI bus...");
> > -
> > - /* get in phase */
> > - NCR5380_write(TARGET_COMMAND_REG,
> > - PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG)));
> > -
> > - /* assert RST */
> > - NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
> > - /* The min. reset hold time is 25us, so 40us should be enough */
> > - udelay(50);
> > - /* reset RST and interrupt */
> > - NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
> > - NCR5380_read(RESET_PARITY_INTERRUPT_REG);
> > -
> > - end = jiffies + AFTER_RESET_DELAY;
> > - while (time_before(jiffies, end))
> > - barrier();
> > -
> > - printk(" done\n");
> > -}
> > -#endif
> > -
> > #if defined(REAL_DMA)
> >
> > static unsigned long atari_scsi_dma_setup(struct Scsi_Host *instance,
> > @@ -917,17 +877,13 @@ static int __init atari_scsi_probe(struc
> > }
> > atari_scsi_host = instance;
> >
> > -#ifdef CONFIG_ATARI_SCSI_RESET_BOOT
> > - atari_scsi_reset_boot();
> > -#endif
> > -
> > instance->irq = irq->start;
> >
> > host_flags |= IS_A_TT() ? 0 : FLAG_LATE_DMA_SETUP;
> > -
> > #ifdef SUPPORT_TAGS
> > host_flags |= setup_use_tagged_queuing > 0 ? FLAG_TAGGED_QUEUING : 0;
> > #endif
> > + host_flags |= setup_toshiba_delay > 0 ? FLAG_TOSHIBA_DELAY : 0;
> >
> > NCR5380_init(instance, host_flags);
> >
> > @@ -975,6 +931,8 @@ static int __init atari_scsi_probe(struc
> > #endif
> > }
> >
> > + NCR5380_maybe_reset_bus(instance);
> > +
> > error = scsi_add_host(instance, NULL);
> > if (error)
> > goto fail_host;
> > Index: linux/drivers/scsi/mac_scsi.c
> > ===================================================================
> > --- linux.orig/drivers/scsi/mac_scsi.c 2015-11-18 19:33:05.000000000 +1100
> > +++ linux/drivers/scsi/mac_scsi.c 2015-11-18 19:33:15.000000000 +1100
> > @@ -49,8 +49,6 @@
> >
> > #include "NCR5380.h"
> >
> > -#define RESET_BOOT
> > -
> > static int setup_can_queue = -1;
> > module_param(setup_can_queue, int, 0);
> > static int setup_cmd_per_lun = -1;
> > @@ -63,17 +61,8 @@ static int setup_use_tagged_queuing = -1
> > module_param(setup_use_tagged_queuing, int, 0);
> > static int setup_hostid = -1;
> > module_param(setup_hostid, int, 0);
> > -
> > -/* Time (in jiffies) to wait after a reset; the SCSI standard calls for 250ms,
> > - * we usually do 0.5s to be on the safe side. But Toshiba CD-ROMs once more
> > - * need ten times the standard value... */
> > -#define TOSHIBA_DELAY
> > -
> > -#ifdef TOSHIBA_DELAY
> > -#define AFTER_RESET_DELAY (5*HZ/2)
> > -#else
> > -#define AFTER_RESET_DELAY (HZ/2)
> > -#endif
> > +static int setup_toshiba_delay = -1;
> > +module_param(setup_toshiba_delay, int, 0);
> >
> > /*
> > * NCR 5380 register access functions
> > @@ -92,12 +81,12 @@ static inline void macscsi_write(struct
> > #ifndef MODULE
> > static int __init mac_scsi_setup(char *str)
> > {
> > - int ints[7];
> > + int ints[8];
> >
> > (void)get_options(str, ARRAY_SIZE(ints), ints);
> >
> > - if (ints[0] < 1 || ints[0] > 6) {
> > - pr_err("Usage: mac5380=<can_queue>[,<cmd_per_lun>[,<sg_tablesize>[,<hostid>[,<use_tags>[,<use_pdma>]]]]]\n");
> > + if (ints[0] < 1) {
> > + pr_err("Usage: mac5380=<can_queue>[,<cmd_per_lun>[,<sg_tablesize>[,<hostid>[,<use_tags>[,<use_pdma>[,toshiba_delay]]]]]]\n");
> > return 0;
> > }
> > if (ints[0] >= 1)
> > @@ -112,47 +101,14 @@ static int __init mac_scsi_setup(char *s
> > setup_use_tagged_queuing = ints[5];
> > if (ints[0] >= 6)
> > setup_use_pdma = ints[6];
> > + if (ints[0] >= 7)
> > + setup_toshiba_delay = ints[7];
> > return 1;
> > }
> >
> > __setup("mac5380=", mac_scsi_setup);
> > #endif /* !MODULE */
> >
> > -#ifdef RESET_BOOT
> > -/*
> > - * Our 'bus reset on boot' function
> > - */
> > -
> > -static void mac_scsi_reset_boot(struct Scsi_Host *instance)
> > -{
> > - unsigned long end;
> > -
> > - /*
> > - * Do a SCSI reset to clean up the bus during initialization. No messing
> > - * with the queues, interrupts, or locks necessary here.
> > - */
> > -
> > - printk(KERN_INFO "Macintosh SCSI: resetting the SCSI bus..." );
> > -
> > - /* get in phase */
> > - NCR5380_write( TARGET_COMMAND_REG,
> > - PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
> > -
> > - /* assert RST */
> > - NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
> > - /* The min. reset hold time is 25us, so 40us should be enough */
> > - udelay( 50 );
> > - /* reset RST and interrupt */
> > - NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
> > - NCR5380_read( RESET_PARITY_INTERRUPT_REG );
> > -
> > - for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
> > - barrier();
> > -
> > - printk(KERN_INFO " done\n" );
> > -}
> > -#endif
> > -
> > #ifdef PSEUDO_DMA
> > /*
> > Pseudo-DMA: (Ove Edlund)
> > @@ -421,13 +377,10 @@ static int __init mac_scsi_probe(struct
> > } else
> > host_flags |= FLAG_NO_PSEUDO_DMA;
> >
> > -#ifdef RESET_BOOT
> > - mac_scsi_reset_boot(instance);
> > -#endif
> > -
> > #ifdef SUPPORT_TAGS
> > host_flags |= setup_use_tagged_queuing > 0 ? FLAG_TAGGED_QUEUING : 0;
> > #endif
> > + host_flags |= setup_toshiba_delay > 0 ? FLAG_TOSHIBA_DELAY : 0;
> >
> > NCR5380_init(instance, host_flags);
> >
> > @@ -438,6 +391,8 @@ static int __init mac_scsi_probe(struct
> > goto fail_irq;
> > }
> >
> > + NCR5380_maybe_reset_bus(instance);
> > +
> > error = scsi_add_host(instance, NULL);
> > if (error)
> > goto fail_host;
> > Index: linux/drivers/scsi/sun3_scsi.c
> > ===================================================================
> > --- linux.orig/drivers/scsi/sun3_scsi.c 2015-11-18 19:32:59.000000000 +1100
> > +++ linux/drivers/scsi/sun3_scsi.c 2015-11-18 19:33:15.000000000 +1100
> > @@ -86,10 +86,6 @@ module_param(setup_use_tagged_queuing, i
> > static int setup_hostid = -1;
> > module_param(setup_hostid, int, 0);
> >
> > -/* #define RESET_BOOT */
> > -
> > -#define AFTER_RESET_DELAY (HZ/2)
> > -
> > /* ms to wait after hitting dma regs */
> > #define SUN3_DMA_DELAY 10
> >
> > @@ -144,45 +140,6 @@ static inline void sun3_udc_write(unsign
> > }
> > #endif
> >
> > -#ifdef RESET_BOOT
> > -static void sun3_scsi_reset_boot(struct Scsi_Host *instance)
> > -{
> > - unsigned long end;
> > -
> > - /*
> > - * Do a SCSI reset to clean up the bus during initialization. No
> > - * messing with the queues, interrupts, or locks necessary here.
> > - */
> > -
> > - printk( "Sun3 SCSI: resetting the SCSI bus..." );
> > -
> > - /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
> > -// sun3_disable_irq( IRQ_SUN3_SCSI );
> > -
> > - /* get in phase */
> > - NCR5380_write( TARGET_COMMAND_REG,
> > - PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
> > -
> > - /* assert RST */
> > - NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
> > -
> > - /* The min. reset hold time is 25us, so 40us should be enough */
> > - udelay( 50 );
> > -
> > - /* reset RST and interrupt */
> > - NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
> > - NCR5380_read( RESET_PARITY_INTERRUPT_REG );
> > -
> > - for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
> > - barrier();
> > -
> > - /* switch on SCSI IRQ again */
> > -// sun3_enable_irq( IRQ_SUN3_SCSI );
> > -
> > - printk( " done\n" );
> > -}
> > -#endif
> > -
> > // safe bits for the CSR
> > #define CSR_GOOD 0x060f
> >
> > @@ -631,9 +588,7 @@ static int __init sun3_scsi_probe(struct
> > dregs->ivect = VME_DATA24 | (instance->irq & 0xff);
> > #endif
> >
> > -#ifdef RESET_BOOT
> > - sun3_scsi_reset_boot(instance);
> > -#endif
> > + NCR5380_maybe_reset_bus(instance);
> >
> > error = scsi_add_host(instance, NULL);
> > if (error)
> > Index: linux/drivers/scsi/NCR5380.h
> > ===================================================================
> > --- linux.orig/drivers/scsi/NCR5380.h 2015-11-18 19:33:10.000000000 +1100
> > +++ linux/drivers/scsi/NCR5380.h 2015-11-18 19:33:15.000000000 +1100
> > @@ -243,6 +243,7 @@
> > #define FLAG_DTC3181E 16 /* DTC3181E */
> > #define FLAG_LATE_DMA_SETUP 32 /* Setup NCR before DMA H/W */
> > #define FLAG_TAGGED_QUEUING 64 /* as X3T9.2 spelled it */
> > +#define FLAG_TOSHIBA_DELAY 128 /* Allow for borken CD-ROMs */
> >
> > #ifdef SUPPORT_TAGS
> > struct tag_alloc {
> > Index: linux/drivers/scsi/NCR5380.c
> > ===================================================================
> > --- linux.orig/drivers/scsi/NCR5380.c 2015-11-18 19:33:13.000000000 +1100
> > +++ linux/drivers/scsi/NCR5380.c 2015-11-18 19:33:15.000000000 +1100
> > @@ -618,7 +618,7 @@ static void prepare_info(struct Scsi_Hos
> > "base 0x%lx, irq %d, "
> > "can_queue %d, cmd_per_lun %d, "
> > "sg_tablesize %d, this_id %d, "
> > - "flags { %s%s%s}, "
> > + "flags { %s%s%s%s}, "
> > #if defined(USLEEP_POLL) && defined(USLEEP_WAITLONG)
> > "USLEEP_POLL %lu, USLEEP_WAITLONG %lu, "
> > #endif
> > @@ -630,6 +630,7 @@ static void prepare_info(struct Scsi_Hos
> > hostdata->flags & FLAG_NCR53C400 ? "NCR53C400 " : "",
> > hostdata->flags & FLAG_DTC3181E ? "DTC3181E " : "",
> > hostdata->flags & FLAG_NO_PSEUDO_DMA ? "NO_PSEUDO_DMA " : "",
> > + hostdata->flags & FLAG_TOSHIBA_DELAY ? "TOSHIBA_DELAY " : "",
> > #if defined(USLEEP_POLL) && defined(USLEEP_WAITLONG)
> > USLEEP_POLL, USLEEP_WAITLONG,
> > #endif
> > @@ -831,6 +832,7 @@ static int NCR5380_init(struct Scsi_Host
> >
> > static int NCR5380_maybe_reset_bus(struct Scsi_Host *instance)
> > {
> > + struct NCR5380_hostdata *hostdata = shost_priv(instance);
> > int pass;
> >
> > for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) {
> > @@ -849,6 +851,14 @@ static int NCR5380_maybe_reset_bus(struc
> > case 4:
> > shost_printk(KERN_ERR, instance, "bus busy, attempting reset\n");
> > do_reset(instance);
> > + /* Wait after a reset; the SCSI standard calls for
> > + * 250ms, we wait 500ms to be on the safe side.
> > + * But some Toshiba CD-ROMs need ten times that.
> > + */
> > + if (hostdata->flags & FLAG_TOSHIBA_DELAY)
> > + msleep(2500);
> > + else
> > + msleep(500);
> > break;
> > case 6:
> > shost_printk(KERN_ERR, instance, "bus locked solid\n");
> > @@ -1253,7 +1263,10 @@ static int NCR5380_select(struct Scsi_Ho
> > * a minimum so we'll udelay ceil(1.2)
> > */
> >
> > - udelay(2);
> > + if (hostdata->flags & FLAG_TOSHIBA_DELAY)
> > + udelay(15);
> > + else
> > + udelay(2);
> >
> > dprintk(NDEBUG_ARBITRATION, "scsi%d : won arbitration\n", instance->host_no);
> >
> >
> >
> --
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