diff options
Diffstat (limited to 'hw/lsi53c895a.c')
| -rw-r--r-- | hw/lsi53c895a.c | 176 |
1 files changed, 84 insertions, 92 deletions
diff --git a/hw/lsi53c895a.c b/hw/lsi53c895a.c index 014c85dbd..e0ade1e54 100644 --- a/hw/lsi53c895a.c +++ b/hw/lsi53c895a.c @@ -173,11 +173,15 @@ do { fprintf(stderr, "lsi_scsi: error: " fmt , ## __VA_ARGS__);} while (0) /* Flag set if this is a tagged command. */ #define LSI_TAG_VALID (1 << 16) -typedef struct { +typedef struct lsi_request { uint32_t tag; + SCSIDevice *dev; + uint32_t dma_len; + uint8_t *dma_buf; uint32_t pending; int out; -} lsi_queue; + QTAILQ_ENTRY(lsi_request) next; +} lsi_request; typedef struct { PCIDevice dev; @@ -198,16 +202,13 @@ typedef struct { * 3 if a DMA operation is in progress. */ int waiting; SCSIBus bus; - SCSIDevice *current_dev; + SCSIDevice *select_dev; int current_lun; /* The tag is a combination of the device ID and the SCSI tag. */ - uint32_t current_tag; - uint32_t current_dma_len; + uint32_t select_tag; int command_complete; - uint8_t *dma_buf; - lsi_queue *queue; - int queue_len; - int active_commands; + QTAILQ_HEAD(, lsi_request) queue; + lsi_request *current; uint32_t dsa; uint32_t temp; @@ -370,7 +371,7 @@ static int lsi_dma_64bit(LSIState *s) static uint8_t lsi_reg_readb(LSIState *s, int offset); static void lsi_reg_writeb(LSIState *s, int offset, uint8_t val); static void lsi_execute_script(LSIState *s); -static void lsi_reselect(LSIState *s, uint32_t tag); +static void lsi_reselect(LSIState *s, lsi_request *p); static inline uint32_t read_dword(LSIState *s, uint32_t addr) { @@ -391,9 +392,9 @@ static void lsi_stop_script(LSIState *s) static void lsi_update_irq(LSIState *s) { - int i; int level; static int last_level; + lsi_request *p; /* It's unclear whether the DIP/SIP bits should be cleared when the Interrupt Status Registers are cleared or when istat0 is read. @@ -427,9 +428,9 @@ static void lsi_update_irq(LSIState *s) if (!level && lsi_irq_on_rsl(s) && !(s->scntl1 & LSI_SCNTL1_CON)) { DPRINTF("Handled IRQs & disconnected, looking for pending " "processes\n"); - for (i = 0; i < s->active_commands; i++) { - if (s->queue[i].pending) { - lsi_reselect(s, s->queue[i].tag); + QTAILQ_FOREACH(p, &s->queue, next) { + if (p->pending) { + lsi_reselect(s, p); break; } } @@ -508,15 +509,16 @@ static void lsi_do_dma(LSIState *s, int out) uint32_t count; target_phys_addr_t addr; - if (!s->current_dma_len) { + assert(s->current); + if (!s->current->dma_len) { /* Wait until data is available. */ DPRINTF("DMA no data available\n"); return; } count = s->dbc; - if (count > s->current_dma_len) - count = s->current_dma_len; + if (count > s->current->dma_len) + count = s->current->dma_len; addr = s->dnad; /* both 40 and Table Indirect 64-bit DMAs store upper bits in dnad64 */ @@ -532,29 +534,29 @@ static void lsi_do_dma(LSIState *s, int out) s->dnad += count; s->dbc -= count; - if (s->dma_buf == NULL) { - s->dma_buf = s->current_dev->info->get_buf(s->current_dev, - s->current_tag); + if (s->current->dma_buf == NULL) { + s->current->dma_buf = s->current->dev->info->get_buf(s->current->dev, + s->current->tag); } /* ??? Set SFBR to first data byte. */ if (out) { - cpu_physical_memory_read(addr, s->dma_buf, count); + cpu_physical_memory_read(addr, s->current->dma_buf, count); } else { - cpu_physical_memory_write(addr, s->dma_buf, count); + cpu_physical_memory_write(addr, s->current->dma_buf, count); } - s->current_dma_len -= count; - if (s->current_dma_len == 0) { - s->dma_buf = NULL; + s->current->dma_len -= count; + if (s->current->dma_len == 0) { + s->current->dma_buf = NULL; if (out) { /* Write the data. */ - s->current_dev->info->write_data(s->current_dev, s->current_tag); + s->current->dev->info->write_data(s->current->dev, s->current->tag); } else { /* Request any remaining data. */ - s->current_dev->info->read_data(s->current_dev, s->current_tag); + s->current->dev->info->read_data(s->current->dev, s->current->tag); } } else { - s->dma_buf += count; + s->current->dma_buf += count; lsi_resume_script(s); } } @@ -563,15 +565,14 @@ static void lsi_do_dma(LSIState *s, int out) /* Add a command to the queue. */ static void lsi_queue_command(LSIState *s) { - lsi_queue *p; + lsi_request *p = s->current; DPRINTF("Queueing tag=0x%x\n", s->current_tag); - if (s->queue_len == s->active_commands) { - s->queue_len++; - s->queue = qemu_realloc(s->queue, s->queue_len * sizeof(lsi_queue)); - } - p = &s->queue[s->active_commands++]; - p->tag = s->current_tag; + assert(s->current != NULL); + assert(s->current->dma_len == 0); + QTAILQ_INSERT_TAIL(&s->queue, s->current, next); + s->current = NULL; + p->pending = 0; p->out = (s->sstat1 & PHASE_MASK) == PHASE_DO; } @@ -588,45 +589,29 @@ static void lsi_add_msg_byte(LSIState *s, uint8_t data) } /* Perform reselection to continue a command. */ -static void lsi_reselect(LSIState *s, uint32_t tag) +static void lsi_reselect(LSIState *s, lsi_request *p) { - lsi_queue *p; - int n; int id; - p = NULL; - for (n = 0; n < s->active_commands; n++) { - p = &s->queue[n]; - if (p->tag == tag) - break; - } - if (n == s->active_commands) { - BADF("Reselected non-existant command tag=0x%x\n", tag); - return; - } - id = (tag >> 8) & 0xf; + assert(s->current == NULL); + QTAILQ_REMOVE(&s->queue, p, next); + s->current = p; + + id = (p->tag >> 8) & 0xf; s->ssid = id | 0x80; /* LSI53C700 Family Compatibility, see LSI53C895A 4-73 */ if (!s->dcntl & LSI_DCNTL_COM) { s->sfbr = 1 << (id & 0x7); } DPRINTF("Reselected target %d\n", id); - s->current_dev = s->bus.devs[id]; - s->current_tag = tag; s->scntl1 |= LSI_SCNTL1_CON; lsi_set_phase(s, PHASE_MI); s->msg_action = p->out ? 2 : 3; - s->current_dma_len = p->pending; - s->dma_buf = NULL; + s->current->dma_len = p->pending; lsi_add_msg_byte(s, 0x80); - if (s->current_tag & LSI_TAG_VALID) { + if (s->current->tag & LSI_TAG_VALID) { lsi_add_msg_byte(s, 0x20); - lsi_add_msg_byte(s, tag & 0xff); - } - - s->active_commands--; - if (n != s->active_commands) { - s->queue[n] = s->queue[s->active_commands]; + lsi_add_msg_byte(s, p->tag & 0xff); } if (lsi_irq_on_rsl(s)) { @@ -638,10 +623,9 @@ static void lsi_reselect(LSIState *s, uint32_t tag) the device was reselected, nonzero if the IO is deferred. */ static int lsi_queue_tag(LSIState *s, uint32_t tag, uint32_t arg) { - lsi_queue *p; - int i; - for (i = 0; i < s->active_commands; i++) { - p = &s->queue[i]; + lsi_request *p; + + QTAILQ_FOREACH(p, &s->queue, next) { if (p->tag == tag) { if (p->pending) { BADF("Multiple IO pending for tag %d\n", tag); @@ -656,10 +640,10 @@ static int lsi_queue_tag(LSIState *s, uint32_t tag, uint32_t arg) (lsi_irq_on_rsl(s) && !(s->scntl1 & LSI_SCNTL1_CON) && !(s->istat0 & (LSI_ISTAT0_SIP | LSI_ISTAT0_DIP)))) { /* Reselect device. */ - lsi_reselect(s, tag); + lsi_reselect(s, p); return 0; } else { - DPRINTF("Queueing IO tag=0x%x\n", tag); + DPRINTF("Queueing IO tag=0x%x\n", tag); p->pending = arg; return 1; } @@ -687,11 +671,15 @@ static void lsi_command_complete(SCSIBus *bus, int reason, uint32_t tag, } else { lsi_set_phase(s, PHASE_ST); } + + qemu_free(s->current); + s->current = NULL; + lsi_resume_script(s); return; } - if (s->waiting == 1 || tag != s->current_tag || + if (s->waiting == 1 || !s->current || tag != s->current->tag || (lsi_irq_on_rsl(s) && !(s->scntl1 & LSI_SCNTL1_CON))) { if (lsi_queue_tag(s, tag, arg)) return; @@ -699,7 +687,7 @@ static void lsi_command_complete(SCSIBus *bus, int reason, uint32_t tag, /* host adapter (re)connected */ DPRINTF("Data ready tag=0x%x len=%d\n", tag, arg); - s->current_dma_len = arg; + s->current->dma_len = arg; s->command_complete = 1; if (!s->waiting) return; @@ -721,14 +709,20 @@ static void lsi_do_command(LSIState *s) cpu_physical_memory_read(s->dnad, buf, s->dbc); s->sfbr = buf[0]; s->command_complete = 0; - n = s->current_dev->info->send_command(s->current_dev, s->current_tag, buf, - s->current_lun); + + assert(s->current == NULL); + s->current = qemu_mallocz(sizeof(lsi_request)); + s->current->tag = s->select_tag; + s->current->dev = s->select_dev; + + n = s->current->dev->info->send_command(s->current->dev, s->current->tag, buf, + s->current_lun); if (n > 0) { lsi_set_phase(s, PHASE_DI); - s->current_dev->info->read_data(s->current_dev, s->current_tag); + s->current->dev->info->read_data(s->current->dev, s->current->tag); } else if (n < 0) { lsi_set_phase(s, PHASE_DO); - s->current_dev->info->write_data(s->current_dev, s->current_tag); + s->current->dev->info->write_data(s->current->dev, s->current->tag); } if (!s->command_complete) { @@ -851,16 +845,16 @@ static void lsi_do_msgout(LSIState *s) } break; case 0x20: /* SIMPLE queue */ - s->current_tag |= lsi_get_msgbyte(s) | LSI_TAG_VALID; + s->select_tag |= lsi_get_msgbyte(s) | LSI_TAG_VALID; DPRINTF("SIMPLE queue tag=0x%x\n", s->current_tag & 0xff); break; case 0x21: /* HEAD of queue */ BADF("HEAD queue not implemented\n"); - s->current_tag |= lsi_get_msgbyte(s) | LSI_TAG_VALID; + s->select_tag |= lsi_get_msgbyte(s) | LSI_TAG_VALID; break; case 0x22: /* ORDERED queue */ BADF("ORDERED queue not implemented\n"); - s->current_tag |= lsi_get_msgbyte(s) | LSI_TAG_VALID; + s->select_tag |= lsi_get_msgbyte(s) | LSI_TAG_VALID; break; default: if ((msg & 0x80) == 0) { @@ -905,17 +899,17 @@ static void lsi_memcpy(LSIState *s, uint32_t dest, uint32_t src, int count) static void lsi_wait_reselect(LSIState *s) { - int i; + lsi_request *p; + DPRINTF("Wait Reselect\n"); - if (s->current_dma_len) - BADF("Reselect with pending DMA\n"); - for (i = 0; i < s->active_commands; i++) { - if (s->queue[i].pending) { - lsi_reselect(s, s->queue[i].tag); + + QTAILQ_FOREACH(p, &s->queue, next) { + if (p->pending) { + lsi_reselect(s, p); break; } } - if (s->current_dma_len == 0) { + if (s->current == NULL) { s->waiting = 1; } } @@ -1093,8 +1087,8 @@ again: /* ??? Linux drivers compain when this is set. Maybe it only applies in low-level mode (unimplemented). lsi_script_scsi_interrupt(s, LSI_SIST0_CMP, 0); */ - s->current_dev = s->bus.devs[id]; - s->current_tag = id << 8; + s->select_dev = s->bus.devs[id]; + s->select_tag = id << 8; s->scntl1 |= LSI_SCNTL1_CON; if (insn & (1 << 3)) { s->socl |= LSI_SOCL_ATN; @@ -2006,9 +2000,11 @@ static void lsi_pre_save(void *opaque) { LSIState *s = opaque; - assert(s->dma_buf == NULL); - assert(s->current_dma_len == 0); - assert(s->active_commands == 0); + if (s->current) { + assert(s->current->dma_buf == NULL); + assert(s->current->dma_len == 0); + } + assert(QTAILQ_EMPTY(&s->queue)); } static const VMStateDescription vmstate_lsi_scsi = { @@ -2101,8 +2097,6 @@ static int lsi_scsi_uninit(PCIDevice *d) cpu_unregister_io_memory(s->mmio_io_addr); cpu_unregister_io_memory(s->ram_io_addr); - qemu_free(s->queue); - return 0; } @@ -2138,9 +2132,7 @@ static int lsi_scsi_init(PCIDevice *dev) PCI_BASE_ADDRESS_SPACE_MEMORY, lsi_mmio_mapfunc); pci_register_bar((struct PCIDevice *)s, 2, 0x2000, PCI_BASE_ADDRESS_SPACE_MEMORY, lsi_ram_mapfunc); - s->queue = qemu_malloc(sizeof(lsi_queue)); - s->queue_len = 1; - s->active_commands = 0; + QTAILQ_INIT(&s->queue); lsi_soft_reset(s); |