From e3c3da67340ac7d1d2f630f319eb718474b0d9c3 Mon Sep 17 00:00:00 2001 From: Finn Thain Date: Wed, 12 Nov 2014 16:12:15 +1100 Subject: [PATCH] atari_NCR5380: Refactor Falcon locking Simplify falcon_release_lock_if_possible() by making callers responsible for disabling local IRQ's, which they must do anyway to correctly synchronize the ST DMA "lock" with core driver data structures. Move this synchronization logic to the core driver with which it is tightly coupled. Other LLD's like sun3_scsi and mac_scsi that can make use of this core driver can just stub out the NCR5380_acquire_dma_irq() and NCR5380_release_dma_irq() calls so the compiler will eliminate the ST DMA code. Remove a redundant local_irq_save/restore pair (irq's are disabled for interrupt handlers these days). Revise the locking for atari_scsi_bus_reset(): use local_irq_save/restore() instead of atari_turnoff/turnon_irq(). There is no guarantee that atari_scsi still holds the ST DMA lock during EH, so atari_turnoff/turnon_irq() could end up dropping an IDE or floppy interrupt. Signed-off-by: Finn Thain Tested-by: Michael Schmitz Reviewed-by: Hannes Reinecke Signed-off-by: Christoph Hellwig --- drivers/scsi/atari_NCR5380.c | 72 ++++++++++++++++++++++-------------- drivers/scsi/atari_scsi.c | 47 +++++++++-------------- 2 files changed, 62 insertions(+), 57 deletions(-) diff --git a/drivers/scsi/atari_NCR5380.c b/drivers/scsi/atari_NCR5380.c index 371ca14f08ea..795522192d36 100644 --- a/drivers/scsi/atari_NCR5380.c +++ b/drivers/scsi/atari_NCR5380.c @@ -925,7 +925,7 @@ static int NCR5380_queue_command(struct Scsi_Host *instance, * because also a timer int can trigger an abort or reset, which would * alter queues and touch the lock. */ - if (!falcon_get_lock()) + if (!NCR5380_acquire_dma_irq(instance)) return SCSI_MLQUEUE_HOST_BUSY; local_irq_save(flags); @@ -960,6 +960,18 @@ static int NCR5380_queue_command(struct Scsi_Host *instance, return 0; } +static inline void maybe_release_dma_irq(struct Scsi_Host *instance) +{ + struct NCR5380_hostdata *hostdata = shost_priv(instance); + + /* Caller does the locking needed to set & test these data atomically */ + if (!hostdata->disconnected_queue && + !hostdata->issue_queue && + !hostdata->connected && + !hostdata->retain_dma_intr) + NCR5380_release_dma_irq(instance); +} + /* * Function : NCR5380_main (void) * @@ -1082,9 +1094,11 @@ static void NCR5380_main(struct work_struct *work) cmd_get_tag(tmp, tmp->cmnd[0] != REQUEST_SENSE); #endif if (!NCR5380_select(instance, tmp)) { + local_irq_disable(); hostdata->retain_dma_intr--; /* release if target did not response! */ - falcon_release_lock_if_possible(hostdata); + maybe_release_dma_irq(instance); + local_irq_restore(flags); break; } else { local_irq_disable(); @@ -2083,11 +2097,12 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance) case COMMAND_COMPLETE: /* Accept message by clearing ACK */ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); - /* ++guenther: possible race with Falcon locking */ - hostdata->retain_dma_intr++; - hostdata->connected = NULL; dprintk(NDEBUG_QUEUES, "scsi%d: command for target %d, lun %llu " "completed\n", HOSTNO, cmd->device->id, cmd->device->lun); + + local_irq_save(flags); + hostdata->retain_dma_intr++; + hostdata->connected = NULL; #ifdef SUPPORT_TAGS cmd_free_tag(cmd); if (status_byte(cmd->SCp.Status) == QUEUE_FULL) { @@ -2146,17 +2161,17 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance) dprintk(NDEBUG_AUTOSENSE, "scsi%d: performing request sense\n", HOSTNO); - local_irq_save(flags); LIST(cmd,hostdata->issue_queue); SET_NEXT(cmd, hostdata->issue_queue); hostdata->issue_queue = (struct scsi_cmnd *) cmd; - local_irq_restore(flags); dprintk(NDEBUG_QUEUES, "scsi%d: REQUEST SENSE added to head of " "issue queue\n", H_NO(cmd)); } else { cmd->scsi_done(cmd); } + local_irq_restore(flags); + NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); /* * Restore phase bits to 0 so an interrupted selection, @@ -2167,12 +2182,14 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance) while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) barrier(); + local_irq_save(flags); hostdata->retain_dma_intr--; /* ++roman: For Falcon SCSI, release the lock on the * ST-DMA here if no other commands are waiting on the * disconnected queue. */ - falcon_release_lock_if_possible(hostdata); + maybe_release_dma_irq(instance); + local_irq_restore(flags); return; case MESSAGE_REJECT: /* Accept message by clearing ACK */ @@ -2331,6 +2348,7 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance) hostdata->last_message = msgout; NCR5380_transfer_pio(instance, &phase, &len, &data); if (msgout == ABORT) { + local_irq_save(flags); #ifdef SUPPORT_TAGS cmd_free_tag(cmd); #else @@ -2338,9 +2356,10 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance) #endif hostdata->connected = NULL; cmd->result = DID_ERROR << 16; - cmd->scsi_done(cmd); NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); - falcon_release_lock_if_possible(hostdata); + maybe_release_dma_irq(instance); + local_irq_restore(flags); + cmd->scsi_done(cmd); return; } msgout = NOP; @@ -2393,7 +2412,6 @@ static void NCR5380_reselect(struct Scsi_Host *instance) unsigned char msg[3]; unsigned char *data; struct scsi_cmnd *tmp = NULL, *prev; -/* unsigned long flags; */ /* * Disable arbitration, etc. since the host adapter obviously @@ -2473,8 +2491,6 @@ static void NCR5380_reselect(struct Scsi_Host *instance) && (tag == tmp->tag) #endif ) { - /* ++guenther: prevent race with falcon_release_lock */ - hostdata->retain_dma_intr++; if (prev) { REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); SET_NEXT(prev, NEXT(tmp)); @@ -2512,7 +2528,6 @@ static void NCR5380_reselect(struct Scsi_Host *instance) 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); - hostdata->retain_dma_intr--; } @@ -2587,12 +2602,12 @@ int NCR5380_abort(struct scsi_cmnd *cmd) #else hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); #endif + maybe_release_dma_irq(instance); local_irq_restore(flags); cmd->scsi_done(cmd); - falcon_release_lock_if_possible(hostdata); return SUCCESS; } else { -/* local_irq_restore(flags); */ + local_irq_restore(flags); printk("scsi%d: abort of connected command failed!\n", HOSTNO); return FAILED; } @@ -2611,13 +2626,13 @@ int NCR5380_abort(struct scsi_cmnd *cmd) (*prev) = NEXT(tmp); SET_NEXT(tmp, NULL); tmp->result = DID_ABORT << 16; + maybe_release_dma_irq(instance); local_irq_restore(flags); dprintk(NDEBUG_ABORT, "scsi%d: abort removed command from issue queue.\n", HOSTNO); /* Tagged queuing note: no tag to free here, hasn't been assigned * yet... */ tmp->scsi_done(tmp); - falcon_release_lock_if_possible(hostdata); return SUCCESS; } } @@ -2695,15 +2710,22 @@ int NCR5380_abort(struct scsi_cmnd *cmd) #else hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); #endif + maybe_release_dma_irq(instance); local_irq_restore(flags); tmp->scsi_done(tmp); - falcon_release_lock_if_possible(hostdata); return SUCCESS; } } } } + /* Maybe it is sufficient just to release the ST-DMA lock... (if + * possible at all) At least, we should check if the lock could be + * released after the abort, in case it is kept due to some bug. + */ + maybe_release_dma_irq(instance); + local_irq_restore(flags); + /* * Case 5 : If we reached this point, the command was not found in any of * the queues. @@ -2714,15 +2736,8 @@ int NCR5380_abort(struct scsi_cmnd *cmd) * broke. */ - local_irq_restore(flags); printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO); - /* Maybe it is sufficient just to release the ST-DMA lock... (if - * possible at all) At least, we should check if the lock could be - * released after the abort, in case it is kept due to some bug. - */ - falcon_release_lock_if_possible(hostdata); - return FAILED; } @@ -2738,14 +2753,15 @@ int NCR5380_abort(struct scsi_cmnd *cmd) static int NCR5380_bus_reset(struct scsi_cmnd *cmd) { - SETUP_HOSTDATA(cmd->device->host); + struct Scsi_Host *instance = cmd->device->host; + struct NCR5380_hostdata *hostdata = shost_priv(instance); int i; unsigned long flags; #if defined(RESET_RUN_DONE) struct scsi_cmnd *connected, *disconnected_queue; #endif - NCR5380_print_status(cmd->device->host); + NCR5380_print_status(instance); /* get in phase */ NCR5380_write(TARGET_COMMAND_REG, @@ -2870,6 +2886,8 @@ static int NCR5380_bus_reset(struct scsi_cmnd *cmd) #ifdef REAL_DMA hostdata->dma_len = 0; #endif + + maybe_release_dma_irq(instance); local_irq_restore(flags); /* we did no complete reset of all commands, so a wakeup is required */ diff --git a/drivers/scsi/atari_scsi.c b/drivers/scsi/atari_scsi.c index 70c662f9fee4..045112186f84 100644 --- a/drivers/scsi/atari_scsi.c +++ b/drivers/scsi/atari_scsi.c @@ -109,6 +109,9 @@ #define NCR5380_dma_xfer_len(instance, cmd, phase) \ atari_dma_xfer_len(cmd->SCp.this_residual, cmd, !((phase) & SR_IO)) +#define NCR5380_acquire_dma_irq(instance) falcon_get_lock() +#define NCR5380_release_dma_irq(instance) falcon_release_lock() + #include "NCR5380.h" @@ -448,23 +451,13 @@ static void atari_scsi_fetch_restbytes(void) * connected command and the disconnected queue is empty. */ -static void falcon_release_lock_if_possible(struct NCR5380_hostdata *hostdata) +static void falcon_release_lock(void) { - unsigned long flags; - if (IS_A_TT()) return; - local_irq_save(flags); - - if (!hostdata->disconnected_queue && - !hostdata->issue_queue && - !hostdata->connected && - !hostdata->retain_dma_intr && - stdma_is_locked_by(scsi_falcon_intr)) + if (stdma_is_locked_by(scsi_falcon_intr)) stdma_release(); - - local_irq_restore(flags); } /* This function manages the locking of the ST-DMA. @@ -787,36 +780,30 @@ static void atari_scsi_falcon_reg_write(unsigned char reg, unsigned char value) static int atari_scsi_bus_reset(struct scsi_cmnd *cmd) { int rv; - struct NCR5380_hostdata *hostdata = shost_priv(cmd->device->host); + unsigned long flags; + + local_irq_save(flags); - /* For doing the reset, SCSI interrupts must be disabled first, - * since the 5380 raises its IRQ line while _RST is active and we - * can't disable interrupts completely, since we need the timer. - */ - /* And abort a maybe active DMA transfer */ - if (IS_A_TT()) { - atari_turnoff_irq(IRQ_TT_MFP_SCSI); #ifdef REAL_DMA + /* Abort a maybe active DMA transfer */ + if (IS_A_TT()) { tt_scsi_dma.dma_ctrl = 0; -#endif } else { - atari_turnoff_irq(IRQ_MFP_FSCSI); -#ifdef REAL_DMA st_dma.dma_mode_status = 0x90; atari_dma_active = 0; atari_dma_orig_addr = NULL; -#endif } +#endif rv = NCR5380_bus_reset(cmd); - if (IS_A_TT()) - atari_turnon_irq(IRQ_TT_MFP_SCSI); - else - atari_turnon_irq(IRQ_MFP_FSCSI); + /* The 5380 raises its IRQ line while _RST is active but the ST DMA + * "lock" has been released so this interrupt may end up handled by + * floppy or IDE driver (if one of them holds the lock). The NCR5380 + * interrupt flag has been cleared already. + */ - if (rv == SUCCESS) - falcon_release_lock_if_possible(hostdata); + local_irq_restore(flags); return rv; } -- 2.20.1