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X-Received-From: 2a00:1450:4864:20::42f Subject: [Qemu-devel] [PULL 21/25] lsi: use enum type for s->waiting X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sven Schnelle Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: Sven Schnelle This makes the code easier to read - no functional change. Signed-off-by: Sven Schnelle Reviewed-by: Philippe Mathieu-Daudé Message-Id: <20190305195519.24303-3-svens@stackframe.org> --- hw/scsi/lsi53c895a.c | 42 +++++++++++++++++++++++------------------- 1 file changed, 23 insertions(+), 19 deletions(-) diff --git a/hw/scsi/lsi53c895a.c b/hw/scsi/lsi53c895a.c index 402b785..c17bb4f 100644 --- a/hw/scsi/lsi53c895a.c +++ b/hw/scsi/lsi53c895a.c @@ -194,6 +194,13 @@ typedef struct lsi_request { QTAILQ_ENTRY(lsi_request) next; } lsi_request; +enum { + LSI_NOWAIT, /* SCRIPTS are running or stopped */ + LSI_WAIT_RESELECT, /* Wait Reselect instruction has been issued */ + LSI_DMA_SCRIPTS, /* processing DMA from lsi_execute_script */ + LSI_DMA_IN_PROGRESS, /* DMA operation is in progress */ +}; + typedef struct { /*< private >*/ PCIDevice parent_obj; @@ -212,10 +219,6 @@ typedef struct { int msg_action; int msg_len; uint8_t msg[LSI_MAX_MSGIN_LEN]; - /* 0 if SCRIPTS are running or stopped. - * 1 if a Wait Reselect instruction has been issued. - * 2 if processing DMA from lsi_execute_script. - * 3 if a DMA operation is in progress. */ int waiting; SCSIBus bus; int current_lun; @@ -322,7 +325,7 @@ static void lsi_soft_reset(LSIState *s) s->msg_action = 0; s->msg_len = 0; - s->waiting = 0; + s->waiting = LSI_NOWAIT; s->dsa = 0; s->dnad = 0; s->dbc = 0; @@ -564,10 +567,10 @@ static void lsi_bad_phase(LSIState *s, int out, int new_phase) static void lsi_resume_script(LSIState *s) { if (s->waiting != 2) { - s->waiting = 0; + s->waiting = LSI_NOWAIT; lsi_execute_script(s); } else { - s->waiting = 0; + s->waiting = LSI_NOWAIT; } } @@ -744,7 +747,7 @@ static int lsi_queue_req(LSIState *s, SCSIRequest *req, uint32_t len) Since no interrupt stacking is implemented in the emulation, it is also required that there are no pending interrupts waiting for service from the device driver. */ - if (s->waiting == 1 || + if (s->waiting == LSI_WAIT_RESELECT || (lsi_irq_on_rsl(s) && !(s->scntl1 & LSI_SCNTL1_CON) && !(s->istat0 & (LSI_ISTAT0_SIP | LSI_ISTAT0_DIP)))) { /* Reselect device. */ @@ -789,7 +792,7 @@ static void lsi_transfer_data(SCSIRequest *req, uint32_t len) int out; assert(req->hba_private); - if (s->waiting == 1 || req->hba_private != s->current || + if (s->waiting == LSI_WAIT_RESELECT || req->hba_private != s->current || (lsi_irq_on_rsl(s) && !(s->scntl1 & LSI_SCNTL1_CON))) { if (lsi_queue_req(s, req, len)) { return; @@ -803,7 +806,7 @@ static void lsi_transfer_data(SCSIRequest *req, uint32_t len) s->current->dma_len = len; s->command_complete = 1; if (s->waiting) { - if (s->waiting == 1 || s->dbc == 0) { + if (s->waiting == LSI_WAIT_RESELECT || s->dbc == 0) { lsi_resume_script(s); } else { lsi_do_dma(s, out); @@ -1093,7 +1096,7 @@ static void lsi_wait_reselect(LSIState *s) lsi_reselect(s, p); } if (s->current == NULL) { - s->waiting = 1; + s->waiting = LSI_WAIT_RESELECT; } } @@ -1202,16 +1205,16 @@ again: s->dnad64 = addr_high; switch (s->sstat1 & 0x7) { case PHASE_DO: - s->waiting = 2; + s->waiting = LSI_DMA_SCRIPTS; lsi_do_dma(s, 1); if (s->waiting) - s->waiting = 3; + s->waiting = LSI_DMA_IN_PROGRESS; break; case PHASE_DI: - s->waiting = 2; + s->waiting = LSI_DMA_SCRIPTS; lsi_do_dma(s, 0); if (s->waiting) - s->waiting = 3; + s->waiting = LSI_DMA_IN_PROGRESS; break; case PHASE_CMD: lsi_do_command(s); @@ -1278,6 +1281,7 @@ again: } s->sbcl |= LSI_SBCL_BSY; lsi_set_phase(s, PHASE_MO); + s->waiting = LSI_NOWAIT; break; case 1: /* Disconnect */ trace_lsi_execute_script_io_disconnect(); @@ -1544,7 +1548,7 @@ again: } } } - if (insn_processed > 10000 && !s->waiting) { + if (insn_processed > 10000 && s->waiting == LSI_NOWAIT) { /* Some windows drivers make the device spin waiting for a memory location to change. If we have been executed a lot of code then assume this is the case and force an unexpected device disconnect. @@ -1556,7 +1560,7 @@ again: } lsi_script_scsi_interrupt(s, LSI_SIST0_UDC, 0); lsi_disconnect(s); - } else if (s->istat1 & LSI_ISTAT1_SRUN && !s->waiting) { + } else if (s->istat1 & LSI_ISTAT1_SRUN && s->waiting == LSI_NOWAIT) { if (s->dcntl & LSI_DCNTL_SSM) { lsi_script_dma_interrupt(s, LSI_DSTAT_SSI); } else { @@ -1887,9 +1891,9 @@ static void lsi_reg_writeb(LSIState *s, int offset, uint8_t val) s->istat0 &= ~LSI_ISTAT0_INTF; lsi_update_irq(s); } - if (s->waiting == 1 && val & LSI_ISTAT0_SIGP) { + if (s->waiting == LSI_WAIT_RESELECT && val & LSI_ISTAT0_SIGP) { trace_lsi_awoken(); - s->waiting = 0; + s->waiting = LSI_NOWAIT; s->dsp = s->dnad; lsi_execute_script(s); }