On Thu, 30 Oct 2014, Hannes Reinecke wrote:
> On 10/27/2014 06:26 AM, Finn Thain wrote:
> > There is very little difference between the sun3_NCR5380.c core driver
> > and atari_NCR5380.c. The former is a fork of the latter.
> >
> > Merge the sun3_NCR5380.c core driver into atari_NCR5380.c so that
> > sun3_scsi.c can adopt the latter and the former can be deleted.
> >
> > Signed-off-by: Finn Thain <fth...@telegraphics.com.au>
> >
> > ---
> >
> > This patch brings some undesirable #ifdef's to atari_NCR5380. It's a
> > small price to pay for the elimination of so much duplication.
> > Eventually, with some testing, it should be possible to remove many of
> > these.
> >
> > Elimination of the SUN3_SCSI_VME macro is necessary to reach the goal
> > of a single platform driver to replace the
> > {atari,mac,sun3,sun3_vme}_scsi modules.
> >
> > Elimination of the #ifdef CONFIG_SUN3 tests is not necessary. But some
> > of these would go away if the sun3 driver followed the atari logic
> > more closely, such as use of PIO vs DMA for certain phases and
> > transfer sizes.
> >
> > After applying this patch it is easy to compare the new
> > atari_NCR5380.c with sun3_NCR5380.c, to check that they are
> > equivalent. E.g.
> >
> > $ cp drivers/scsi/{sun3,atari}_NCR5380.c /tmp
> > $ sed -i -e 's/ *$//' /tmp/{sun3,atari}_NCR5380.c
> > $ scripts/Lindent -l96 -hnl /tmp/{sun3,atari}_NCR5380.c
> > $ meld /tmp/{sun3,atari}_NCR5380.c
> >
> > One can see that the two implementations of tagged command queueing
> > have diverged since the fork. The atari version has been updated and
> > the sun3 implementation is unused as sun3_scsi.c does not define
> > SUPPORT_TAGS.
> >
> > The remaining differences are merge_contiguous_buffers() and the
> > falcon locking code. The falcon code disappears when suitable macro
> > definitions are provided in sun3_scsi.c. merge_contiguous_buffers()
> > could be a problem for sun3 (due to a DMA setup in an odd place) so it
> > is #ifdef'd for sun3 until the DMA setup discrepancies can be
> > reconciled or moved out of the core driver.
> >
> > ---
> > drivers/scsi/atari_NCR5380.c | 210
> > +++++++++++++++++++++++++++++++++++++++----
> > drivers/scsi/atari_scsi.c | 1
> > 2 files changed, 195 insertions(+), 16 deletions(-)
> >
> > Index: linux/drivers/scsi/atari_NCR5380.c
> > ===================================================================
> > --- linux.orig/drivers/scsi/atari_NCR5380.c 2014-10-27 16:25:55.000000000
> > +1100
> > +++ linux/drivers/scsi/atari_NCR5380.c 2014-10-27 16:25:56.000000000
> > +1100
> > @@ -71,6 +71,9 @@
> > * 1. Test linked command handling code after Eric is ready with
> > * the high level code.
> > */
> > +
> > +/* Adapted for the sun3 by Sam Creasey. */
> > +
> > #include <scsi/scsi_dbg.h>
> > #include <scsi/scsi_transport_spi.h>
> >
> > @@ -458,6 +461,7 @@ static void free_all_tags(void)
> >
> > static void merge_contiguous_buffers(struct scsi_cmnd *cmd)
> > {
> > +#if !defined(CONFIG_SUN3)
> > unsigned long endaddr;
> > #if (NDEBUG & NDEBUG_MERGING)
> > unsigned long oldlen = cmd->SCp.this_residual;
> > @@ -482,6 +486,7 @@ static void merge_contiguous_buffers(str
> > dprintk(NDEBUG_MERGING, "merged %d buffers from %p, new length
> > %08x\n",
> > cnt, cmd->SCp.ptr, cmd->SCp.this_residual);
> > #endif
> > +#endif /* !defined(CONFIG_SUN3) */
> > }
> >
> > /*
> > @@ -1043,12 +1048,10 @@ static void NCR5380_main(struct work_str
> > prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp)) {
> > u8 lun = tmp->device->lun;
> >
> > -#if (NDEBUG & NDEBUG_LISTS)
> > - if (prev != tmp)
> > - printk("MAIN tmp=%p target=%d
> > busy=%d lun=%llu\n",
> > - tmp, tmp->device->id,
> > hostdata->busy[tmp->device->id],
> > - lun);
> > -#endif
> > + dprintk(NDEBUG_LISTS,
> > + "MAIN tmp=%p target=%d busy=%d
> > lun=%d\n",
> > + tmp, scmd_id(tmp),
> > hostdata->busy[scmd_id(tmp)],
> > + lun);
> > /* When we find one, remove it from the issue
> > queue. */
> > /* ++guenther: possible race with Falcon
> > locking */
> > if (
> > @@ -1157,9 +1160,11 @@ static void NCR5380_main(struct work_str
> > static void NCR5380_dma_complete(struct Scsi_Host *instance)
> > {
> > SETUP_HOSTDATA(instance);
> > - int transfered, saved_data = 0, overrun = 0, cnt, toPIO;
> > - unsigned char **data, p;
> > + int transfered;
> > + unsigned char **data;
> > volatile int *count;
> > + int saved_data = 0, overrun = 0;
> > + unsigned char p;
> >
> > if (!hostdata->connected) {
> > printk(KERN_WARNING "scsi%d: received end of DMA interrupt with
> > "
>
> nitpick: shouldn't that be 'transferred' ?
The intention of this patch was to merge two files into one file, in such
a way that the result could be easily compared with the originals.
With that in mind, fixing this typo could be done pre-merger by patching
both files, or post-merger by patching just one.
If this patch series ends up iterating again as v3, I'll add a new patch
to the end to fix this (long standing) typo.
If there's no need for a re-spin, I'll send a separate patch with Cc to
triv...@kernel.org.
>
> > @@ -1185,6 +1190,26 @@ static void NCR5380_dma_complete(struct
> > HOSTNO, NCR5380_read(BUS_AND_STATUS_REG),
> > NCR5380_read(STATUS_REG));
> >
> > +#if defined(CONFIG_SUN3)
> > + if ((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) {
> > + pr_err("scsi%d: overrun in UDC counter -- not prepared to deal
> > with this!\n",
> > + instance->host_no);
> > + pr_err("please e-mail sa...@sammy.net with a description of how
> > this error was produced.\n");
> > + BUG();
> > + }
> > +
> > + /* make sure we're not stuck in a data phase */
> > + if ((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK))
> > ==
> > + (BASR_PHASE_MATCH | BASR_ACK)) {
> > + pr_err("scsi%d: BASR %02x\n", instance->host_no,
> > + NCR5380_read(BUS_AND_STATUS_REG));
> > + pr_err("scsi%d: bus stuck in data phase -- probably a single
> > byte overrun!\n",
> > + instance->host_no);
> > + pr_err("not prepared for this error! please e-mail
> > sa...@sammy.net with a description of how this error was produced.\n");
> > + BUG();
> > + }
> > +#endif
> > +
> > (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
> > NCR5380_write(MODE_REG, MR_BASE);
> > NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
> > @@ -1198,6 +1223,8 @@ static void NCR5380_dma_complete(struct
> > *count -= transfered;
> >
> > if (hostdata->read_overruns) {
> > + int cnt, toPIO;
> > +
> > if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p &
> > SR_IO)) {
> > cnt = toPIO = hostdata->read_overruns;
> > if (overrun) {
> > @@ -1277,11 +1304,14 @@ static irqreturn_t NCR5380_intr(int irq,
> > {
> > /* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt)
> > */
> > if (basr & BASR_PHASE_MATCH)
> > - printk(KERN_NOTICE "scsi%d: unknown
> > interrupt, "
> > + dprintk(NDEBUG_INTR, "scsi%d: unknown
> > interrupt, "
> > "BASR 0x%x, MR 0x%x, SR 0x%x\n",
> > HOSTNO, basr,
> > NCR5380_read(MODE_REG),
> > NCR5380_read(STATUS_REG));
> > (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
> > +#ifdef SUN3_SCSI_VME
> > + dregs->csr |= CSR_DMA_ENABLE;
> > +#endif
> > }
> > } /* if !(SELECTION || PARITY) */
> > handled = 1;
> > @@ -1290,6 +1320,9 @@ static irqreturn_t NCR5380_intr(int irq,
> > "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr,
> > NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
> > (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
> > +#ifdef SUN3_SCSI_VME
> > + dregs->csr |= CSR_DMA_ENABLE;
> > +#endif
> > }
> >
> > if (!done) {
> > @@ -1622,6 +1655,9 @@ static int NCR5380_select(struct Scsi_Ho
> > #ifndef SUPPORT_TAGS
> > hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
> > #endif
> > +#ifdef SUN3_SCSI_VME
> > + dregs->csr |= CSR_INTR;
> > +#endif
> >
> > initialize_SCp(cmd);
> >
> > @@ -1845,9 +1881,54 @@ static int NCR5380_transfer_dma(struct S
> > SETUP_HOSTDATA(instance);
> > register int c = *count;
> > register unsigned char p = *phase;
> > + unsigned long flags;
> > +
> > +#if defined(CONFIG_SUN3)
> > + /* sanity check */
> > + if (!sun3_dma_setup_done) {
> > + pr_err("scsi%d: transfer_dma without setup!\n",
> > + instance->host_no);
> > + BUG();
> > + }
> > + hostdata->dma_len = c;
> > +
> > + dprintk(NDEBUG_DMA, "scsi%d: initializing DMA for %s, %d bytes %s %p\n",
> > + instance->host_no, (p & SR_IO) ? "reading" : "writing",
> > + c, (p & SR_IO) ? "to" : "from", *data);
> > +
> > + /* netbsd turns off ints here, why not be safe and do it too */
> > + local_irq_save(flags);
> > +
> > + /* send start chain */
> > + sun3scsi_dma_start(c, *data);
> > +
> > + if (p & SR_IO) {
> > + NCR5380_write(TARGET_COMMAND_REG, 1);
> > + NCR5380_read(RESET_PARITY_INTERRUPT_REG);
> > + NCR5380_write(INITIATOR_COMMAND_REG, 0);
> > + NCR5380_write(MODE_REG,
> > + (NCR5380_read(MODE_REG) | MR_DMA_MODE |
> > MR_ENABLE_EOP_INTR));
> > + NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
> > + } else {
> > + NCR5380_write(TARGET_COMMAND_REG, 0);
> > + NCR5380_read(RESET_PARITY_INTERRUPT_REG);
> > + NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA);
> > + NCR5380_write(MODE_REG,
> > + (NCR5380_read(MODE_REG) | MR_DMA_MODE |
> > MR_ENABLE_EOP_INTR));
> > + NCR5380_write(START_DMA_SEND_REG, 0);
> > + }
> > +
> > +#ifdef SUN3_SCSI_VME
> > + dregs->csr |= CSR_DMA_ENABLE;
> > +#endif
> > +
> > + local_irq_restore(flags);
> > +
> > + sun3_dma_active = 1;
> > +
> > +#else /* !defined(CONFIG_SUN3) */
> > register unsigned char *d = *data;
> > unsigned char tmp;
> > - unsigned long flags;
> >
> > if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
> > *phase = tmp;
> > @@ -1895,6 +1976,8 @@ static int NCR5380_transfer_dma(struct S
> > NCR5380_dma_write_setup(instance, d, c);
> > local_irq_restore(flags);
> > }
> > +#endif /* !defined(CONFIG_SUN3) */
> > +
> > return 0;
> > }
> > #endif /* defined(REAL_DMA) */
> > @@ -1930,6 +2013,10 @@ static void NCR5380_information_transfer
> > unsigned char phase, tmp, extended_msg[10], old_phase = 0xff;
> > struct scsi_cmnd *cmd = (struct scsi_cmnd *) hostdata->connected;
> >
> > +#ifdef SUN3_SCSI_VME
> > + dregs->csr |= CSR_INTR;
> > +#endif
> > +
> > while (1) {
> > tmp = NCR5380_read(STATUS_REG);
> > /* We only have a valid SCSI phase when REQ is asserted */
> > @@ -1939,6 +2026,33 @@ static void NCR5380_information_transfer
> > old_phase = phase;
> > NCR5380_dprint_phase(NDEBUG_INFORMATION,
> > instance);
> > }
> > +#if defined(CONFIG_SUN3)
> > + if (phase == PHASE_CMDOUT) {
> > +#if defined(REAL_DMA)
> > + void *d;
> > + unsigned long count;
> > +
> > + if (!cmd->SCp.this_residual &&
> > cmd->SCp.buffers_residual) {
> > + count = cmd->SCp.buffer->length;
> > + d = sg_virt(cmd->SCp.buffer);
> > + } else {
> > + count = cmd->SCp.this_residual;
> > + d = cmd->SCp.ptr;
> > + }
> > + /* this command setup for dma yet? */
> > + if ((count >= DMA_MIN_SIZE) &&
> > (sun3_dma_setup_done != cmd)) {
> > + if (cmd->request->cmd_type ==
> > REQ_TYPE_FS) {
> > + sun3scsi_dma_setup(d, count,
> > +
> > rq_data_dir(cmd->request));
> > + sun3_dma_setup_done = cmd;
> > + }
> > + }
> > +#endif
> > +#ifdef SUN3_SCSI_VME
> > + dregs->csr |= CSR_INTR;
> > +#endif
> > + }
> > +#endif /* CONFIG_SUN3 */
> >
> > if (sink && (phase != PHASE_MSGOUT)) {
> > NCR5380_write(TARGET_COMMAND_REG,
> > PHASE_SR_TO_TCR(tmp));
> > @@ -2000,8 +2114,11 @@ static void NCR5380_information_transfer
> > */
> >
> > #if defined(REAL_DMA)
> > - if (!cmd->device->borken &&
> > - (transfersize =
> > NCR5380_dma_xfer_len(instance,cmd,phase)) > 31) {
> > + if (
> > +#if !defined(CONFIG_SUN3)
> > + !cmd->device->borken &&
> > +#endif
> > + (transfersize =
> > NCR5380_dma_xfer_len(instance, cmd, phase)) >= DMA_MIN_SIZE) {
> > len = transfersize;
> > cmd->SCp.phase = phase;
> > if (NCR5380_transfer_dma(instance,
> > &phase,
> > @@ -2038,6 +2155,11 @@ static void NCR5380_information_transfer
> > NCR5380_transfer_pio(instance, &phase,
> > (int
> > *)&cmd->SCp.this_residual,
> > (unsigned char
> > **)&cmd->SCp.ptr);
> > +#if defined(CONFIG_SUN3) && defined(REAL_DMA)
> > + /* if we had intended to dma that command clear
> > it */
> > + if (sun3_dma_setup_done == cmd)
> > + sun3_dma_setup_done = NULL;
> > +#endif
> > break;
> > case PHASE_MSGIN:
> > len = 1;
> > @@ -2243,6 +2365,9 @@ static void NCR5380_information_transfer
> > /* Wait for bus free to avoid nasty
> > timeouts */
> > while ((NCR5380_read(STATUS_REG) &
> > SR_BSY) && !hostdata->connected)
> > barrier();
> > +#ifdef SUN3_SCSI_VME
> > + dregs->csr |= CSR_DMA_ENABLE;
> > +#endif
> > return;
> > /*
> > * The SCSI data pointer is
> > *IMPLICITLY* saved on a disconnect
> > @@ -2402,17 +2527,20 @@ static void NCR5380_information_transfer
> > */
> >
> >
> > +/* it might eventually prove necessary to do a dma setup on
> > + reselection, but it doesn't seem to be needed now -- sam */
> > +
> > static void NCR5380_reselect(struct Scsi_Host *instance)
> > {
> > SETUP_HOSTDATA(instance);
> > unsigned char target_mask;
> > - unsigned char lun, phase;
> > - int len;
> > + unsigned char lun;
> > #ifdef SUPPORT_TAGS
> > unsigned char tag;
> > #endif
> > unsigned char msg[3];
> > - unsigned char *data;
> > + int __maybe_unused len;
> > + unsigned char __maybe_unused *data, __maybe_unused phase;
> > struct scsi_cmnd *tmp = NULL, *prev;
> >
> > /*
> > @@ -2449,10 +2577,18 @@ static void NCR5380_reselect(struct Scsi
> > while (!(NCR5380_read(STATUS_REG) & SR_REQ))
> > ;
> >
> > +#if defined(CONFIG_SUN3) && defined(REAL_DMA)
> > + /* acknowledge toggle to MSGIN */
> > + NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN));
> > +
> > + /* peek at the byte without really hitting the bus */
> > + msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG);
> > +#else
> > len = 1;
> > data = msg;
> > phase = PHASE_MSGIN;
> > NCR5380_transfer_pio(instance, &phase, &len, &data);
> > +#endif
> >
> > if (!(msg[0] & 0x80)) {
> > printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ",
> > HOSTNO);
> > @@ -2462,7 +2598,7 @@ static void NCR5380_reselect(struct Scsi
> > }
> > lun = (msg[0] & 0x07);
> >
> > -#ifdef SUPPORT_TAGS
> > +#if defined(SUPPORT_TAGS) && !defined(CONFIG_SUN3)
> > /* If the phase is still MSGIN, the target wants to send some more
> > * messages. In case it supports tagged queuing, this is probably a
> > * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
> > @@ -2524,9 +2660,51 @@ static void NCR5380_reselect(struct Scsi
> > return;
> > }
> >
> > +#if defined(CONFIG_SUN3) && defined(REAL_DMA)
> > + /* engage dma setup for the command we just saw */
> > + {
> > + void *d;
> > + unsigned long count;
> > +
> > + if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) {
> > + count = tmp->SCp.buffer->length;
> > + d = sg_virt(tmp->SCp.buffer);
> > + } else {
> > + count = tmp->SCp.this_residual;
> > + d = tmp->SCp.ptr;
> > + }
> > + /* setup this command for dma if not already */
> > + if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != tmp)) {
> > + sun3scsi_dma_setup(d, count, rq_data_dir(tmp->request));
> > + sun3_dma_setup_done = tmp;
> > + }
> > + }
> > +
> > + NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
> > +#endif
> > +
> > /* Accept message by clearing ACK */
> > NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
> >
> > +#if defined(SUPPORT_TAGS) && defined(CONFIG_SUN3)
> > + /* If the phase is still MSGIN, the target wants to send some more
> > + * messages. In case it supports tagged queuing, this is probably a
> > + * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
> > + */
> > + tag = TAG_NONE;
> > + if (phase == PHASE_MSGIN && setup_use_tagged_queuing) {
> > + /* Accept previous IDENTIFY message by clearing ACK */
> > + NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
> > + len = 2;
> > + data = msg + 1;
> > + if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
> > + msg[1] == SIMPLE_QUEUE_TAG)
> > + tag = msg[2];
> > + dprintk(NDEBUG_TAGS, "scsi%d: target mask %02x, lun %d sent tag
> > %d at reselection\n"
> > + HOSTNO, target_mask, lun, tag);
> > + }
> > +#endif
> > +
> > hostdata->connected = tmp;
> > dprintk(NDEBUG_RESELECTION, "scsi%d: nexus established, target = %d,
> > lun = %llu, tag = %d\n",
> > HOSTNO, tmp->device->id, tmp->device->lun, tmp->tag);
> > Index: linux/drivers/scsi/atari_scsi.c
> > ===================================================================
> > --- linux.orig/drivers/scsi/atari_scsi.c 2014-10-27 16:25:55.000000000
> > +1100
> > +++ linux/drivers/scsi/atari_scsi.c 2014-10-27 16:25:56.000000000 +1100
> > @@ -89,6 +89,7 @@
> > #define REAL_DMA
> > #define SUPPORT_TAGS
> > #define MAX_TAGS 32
> > +#define DMA_MIN_SIZE 32
> >
> > #define NCR5380_implementation_fields /* none */
> >
> >
> >
> You reference a certain Sam Creasey in the code (and there is even
> his email in it). Has he contributed to this patch?
No, the patch is my work.
As I understand it, sun3_NCR5380.c was originally Sam's (derived) work.
> If so, shouldn't he be added somewhere in the patch description,
> either with 'From;' (if the patch was originally by him)
> or with a 'Signed-off-by' tag?
I did Cc these patches to Sam, for comment/testing; perhaps a Cc tag might
have been appropriate but I gather they are optional.
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