diff options
| -rw-r--r-- | drivers/scsi/dc395x.c | 217 | ||||
| -rw-r--r-- | drivers/scsi/scsi_lib.c | 57 | ||||
| -rw-r--r-- | include/scsi/scsi_cmnd.h | 4 |
3 files changed, 176 insertions, 102 deletions
diff --git a/drivers/scsi/dc395x.c b/drivers/scsi/dc395x.c index cbf8252..0c56095 100644 --- a/drivers/scsi/dc395x.c +++ b/drivers/scsi/dc395x.c @@ -230,13 +230,12 @@ struct ScsiReqBlk { struct scsi_cmnd *cmd; struct SGentry *segment_x; /* Linear array of hw sg entries (up to 64 entries) */ - u32 sg_bus_addr; /* Bus address of sg list (ie, of segment_x) */ + dma_addr_t sg_bus_addr; /* Bus address of sg list (ie, of segment_x) */ u8 sg_count; /* No of HW sg entries for this request */ u8 sg_index; /* Index of HW sg entry for this request */ - u32 total_xfer_length; /* Total number of bytes remaining to be transfered */ - unsigned char *virt_addr; /* Virtual address of current transfer position */ - + size_t total_xfer_length; /* Total number of bytes remaining to be transfered */ + size_t request_length; /* Total number of bytes in this request */ /* * The sense buffer handling function, request_sense, uses * the first hw sg entry (segment_x[0]) and the transfer @@ -246,8 +245,7 @@ struct ScsiReqBlk { * total_xfer_length in xferred. These values are restored in * pci_unmap_srb_sense. This is the only place xferred is used. */ - unsigned char *virt_addr_req; /* Saved virtual address of the request buffer */ - u32 xferred; /* Saved copy of total_xfer_length */ + size_t xferred; /* Saved copy of total_xfer_length */ u16 state; @@ -977,17 +975,6 @@ static void send_srb(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb) } } -static inline void pio_trigger(void) -{ - static int feedback_requested; - - if (!feedback_requested) { - feedback_requested = 1; - printk(KERN_WARNING "%s: Please, contact <linux-scsi@vger.kernel.org> " - "to help improve support for your system.\n", __FILE__); - } -} - /* Prepare SRB for being sent to Device DCB w/ command *cmd */ static void build_srb(struct scsi_cmnd *cmd, struct DeviceCtlBlk *dcb, struct ScsiReqBlk *srb) @@ -1001,7 +988,6 @@ static void build_srb(struct scsi_cmnd *cmd, struct DeviceCtlBlk *dcb, srb->sg_count = 0; srb->total_xfer_length = 0; srb->sg_bus_addr = 0; - srb->virt_addr = NULL; srb->sg_index = 0; srb->adapter_status = 0; srb->target_status = 0; @@ -1032,7 +1018,6 @@ static void build_srb(struct scsi_cmnd *cmd, struct DeviceCtlBlk *dcb, reqlen, cmd->request_buffer, cmd->use_sg, srb->sg_count); - srb->virt_addr = page_address(sl->page); for (i = 0; i < srb->sg_count; i++) { u32 busaddr = (u32)sg_dma_address(&sl[i]); u32 seglen = (u32)sl[i].length; @@ -1077,12 +1062,14 @@ static void build_srb(struct scsi_cmnd *cmd, struct DeviceCtlBlk *dcb, srb->total_xfer_length++; srb->segment_x[0].length = srb->total_xfer_length; - srb->virt_addr = cmd->request_buffer; + dprintkdbg(DBG_0, "build_srb: [1] len=%d buf=%p use_sg=%d map=%08x\n", srb->total_xfer_length, cmd->request_buffer, cmd->use_sg, srb->segment_x[0].address); } + + srb->request_length = srb->total_xfer_length; } @@ -1414,10 +1401,10 @@ static int dc395x_eh_abort(struct scsi_cmnd *cmd) } srb = find_cmd(cmd, &dcb->srb_going_list); if (srb) { - dprintkl(KERN_DEBUG, "eh_abort: Command in progress"); + dprintkl(KERN_DEBUG, "eh_abort: Command in progress\n"); /* XXX: Should abort the command here */ } else { - dprintkl(KERN_DEBUG, "eh_abort: Command not found"); + dprintkl(KERN_DEBUG, "eh_abort: Command not found\n"); } return FAILED; } @@ -1976,14 +1963,11 @@ static void sg_verify_length(struct ScsiReqBlk *srb) /* * Compute the next Scatter Gather list index and adjust its length - * and address if necessary; also compute virt_addr + * and address if necessary */ static void sg_update_list(struct ScsiReqBlk *srb, u32 left) { u8 idx; - struct scatterlist *sg; - struct scsi_cmnd *cmd = srb->cmd; - int segment = cmd->use_sg; u32 xferred = srb->total_xfer_length - left; /* bytes transfered */ struct SGentry *psge = srb->segment_x + srb->sg_index; @@ -2016,29 +2000,6 @@ static void sg_update_list(struct ScsiReqBlk *srb, u32 left) psge++; } sg_verify_length(srb); - - /* we need the corresponding virtual address */ - if (!segment || (srb->flag & AUTO_REQSENSE)) { - srb->virt_addr += xferred; - return; - } - - /* We have to walk the scatterlist to find it */ - sg = (struct scatterlist *)cmd->request_buffer; - while (segment--) { - unsigned long mask = - ~((unsigned long)sg->length - 1) & PAGE_MASK; - if ((sg_dma_address(sg) & mask) == (psge->address & mask)) { - srb->virt_addr = (page_address(sg->page) - + psge->address - - (psge->address & PAGE_MASK)); - return; - } - ++sg; - } - - dprintkl(KERN_ERR, "sg_update_list: sg_to_virt failed\n"); - srb->virt_addr = NULL; } @@ -2050,15 +2011,7 @@ static void sg_update_list(struct ScsiReqBlk *srb, u32 left) */ static void sg_subtract_one(struct ScsiReqBlk *srb) { - srb->total_xfer_length--; - srb->segment_x[srb->sg_index].length--; - if (srb->total_xfer_length && - !srb->segment_x[srb->sg_index].length) { - if (debug_enabled(DBG_PIO)) - printk(" (next segment)"); - srb->sg_index++; - sg_update_list(srb, srb->total_xfer_length); - } + sg_update_list(srb, srb->total_xfer_length - 1); } @@ -2118,7 +2071,7 @@ static void data_out_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb, * If we need more data, the DMA SG list will be freshly set up, anyway */ dprintkdbg(DBG_PIO, "data_out_phase0: " - "DMA{fifcnt=0x%02x fifostat=0x%02x} " + "DMA{fifocnt=0x%02x fifostat=0x%02x} " "SCSI{fifocnt=0x%02x cnt=0x%06x status=0x%04x} total=0x%06x\n", DC395x_read8(acb, TRM_S1040_DMA_FIFOCNT), DC395x_read8(acb, TRM_S1040_DMA_FIFOSTAT), @@ -2239,12 +2192,11 @@ static void data_out_phase1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb, data_io_transfer(acb, srb, XFERDATAOUT); } - static void data_in_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb, u16 *pscsi_status) { u16 scsi_status = *pscsi_status; - u32 d_left_counter = 0; + dprintkdbg(DBG_0, "data_in_phase0: (pid#%li) <%02i-%i>\n", srb->cmd->pid, srb->cmd->device->id, srb->cmd->device->lun); @@ -2262,6 +2214,9 @@ static void data_in_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb, * seem to be a bad idea, actually. */ if (!(srb->state & SRB_XFERPAD)) { + u32 d_left_counter; + unsigned int sc, fc; + if (scsi_status & PARITYERROR) { dprintkl(KERN_INFO, "data_in_phase0: (pid#%li) " "Parity Error\n", srb->cmd->pid); @@ -2298,18 +2253,19 @@ static void data_in_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb, DC395x_read8(acb, TRM_S1040_DMA_FIFOSTAT)); } /* Now: Check remainig data: The SCSI counters should tell us ... */ - d_left_counter = DC395x_read32(acb, TRM_S1040_SCSI_COUNTER) - + ((DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT) & 0x1f) + sc = DC395x_read32(acb, TRM_S1040_SCSI_COUNTER); + fc = DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT); + d_left_counter = sc + ((fc & 0x1f) << ((srb->dcb->sync_period & WIDE_SYNC) ? 1 : 0)); dprintkdbg(DBG_KG, "data_in_phase0: " "SCSI{fifocnt=0x%02x%s ctr=0x%08x} " "DMA{fifocnt=0x%02x fifostat=0x%02x ctr=0x%08x} " "Remain{totxfer=%i scsi_fifo+ctr=%i}\n", - DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT), + fc, (srb->dcb->sync_period & WIDE_SYNC) ? "words" : "bytes", - DC395x_read32(acb, TRM_S1040_SCSI_COUNTER), - DC395x_read8(acb, TRM_S1040_DMA_FIFOCNT), + sc, + fc, DC395x_read8(acb, TRM_S1040_DMA_FIFOSTAT), DC395x_read32(acb, TRM_S1040_DMA_CXCNT), srb->total_xfer_length, d_left_counter); @@ -2317,40 +2273,79 @@ static void data_in_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb, /* KG: Less than or equal to 4 bytes can not be transfered via DMA, it seems. */ if (d_left_counter && srb->total_xfer_length <= DC395x_LASTPIO) { + size_t left_io = srb->total_xfer_length; + /*u32 addr = (srb->segment_x[srb->sg_index].address); */ /*sg_update_list (srb, d_left_counter); */ - dprintkdbg(DBG_PIO, "data_in_phase0: PIO (%i %s) to " - "%p for remaining %i bytes:", - DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT) & 0x1f, + dprintkdbg(DBG_PIO, "data_in_phase0: PIO (%i %s) " + "for remaining %i bytes:", + fc & 0x1f, (srb->dcb->sync_period & WIDE_SYNC) ? "words" : "bytes", - srb->virt_addr, srb->total_xfer_length); if (srb->dcb->sync_period & WIDE_SYNC) DC395x_write8(acb, TRM_S1040_SCSI_CONFIG2, CFG2_WIDEFIFO); - while (DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT) != 0x40) { - u8 byte = DC395x_read8(acb, TRM_S1040_SCSI_FIFO); - pio_trigger(); - *(srb->virt_addr)++ = byte; - if (debug_enabled(DBG_PIO)) - printk(" %02x", byte); - d_left_counter--; - sg_subtract_one(srb); - } - if (srb->dcb->sync_period & WIDE_SYNC) { -#if 1 - /* Read the last byte ... */ - if (srb->total_xfer_length > 0) { - u8 byte = DC395x_read8(acb, TRM_S1040_SCSI_FIFO); - pio_trigger(); - *(srb->virt_addr)++ = byte; - srb->total_xfer_length--; + while (left_io) { + unsigned char *virt, *base = NULL; + unsigned long flags = 0; + size_t len = left_io; + + if (srb->cmd->use_sg) { + size_t offset = srb->request_length - left_io; + local_irq_save(flags); + /* Assumption: it's inside one page as it's at most 4 bytes and + I just assume it's on a 4-byte boundary */ + base = scsi_kmap_atomic_sg((struct scatterlist *)srb->cmd->request_buffer, + srb->sg_count, &offset, &len); + virt = base + offset; + } else { + virt = srb->cmd->request_buffer + srb->cmd->request_bufflen - left_io; + len = left_io; + } + left_io -= len; + + while (len) { + u8 byte; + byte = DC395x_read8(acb, TRM_S1040_SCSI_FIFO); + *virt++ = byte; + if (debug_enabled(DBG_PIO)) printk(" %02x", byte); + + d_left_counter--; + sg_subtract_one(srb); + + len--; + + fc = DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT); + + if (fc == 0x40) { + left_io = 0; + break; + } + } + + WARN_ON((fc != 0x40) == !d_left_counter); + + if (fc == 0x40 && (srb->dcb->sync_period & WIDE_SYNC)) { + /* Read the last byte ... */ + if (srb->total_xfer_length > 0) { + u8 byte = DC395x_read8(acb, TRM_S1040_SCSI_FIFO); + + *virt++ = byte; + srb->total_xfer_length--; + if (debug_enabled(DBG_PIO)) + printk(" %02x", byte); + } + + DC395x_write8(acb, TRM_S1040_SCSI_CONFIG2, 0); + } + + if (srb->cmd->use_sg) { + scsi_kunmap_atomic_sg(base); + local_irq_restore(flags); } -#endif - DC395x_write8(acb, TRM_S1040_SCSI_CONFIG2, 0); } /*printk(" %08x", *(u32*)(bus_to_virt (addr))); */ /*srb->total_xfer_length = 0; */ @@ -2509,22 +2504,43 @@ static void data_io_transfer(struct AdapterCtlBlk *acb, SCMD_FIFO_IN); } else { /* write */ int ln = srb->total_xfer_length; + size_t left_io = srb->total_xfer_length; + if (srb->dcb->sync_period & WIDE_SYNC) DC395x_write8(acb, TRM_S1040_SCSI_CONFIG2, CFG2_WIDEFIFO); - dprintkdbg(DBG_PIO, - "data_io_transfer: PIO %i bytes from %p:", - srb->total_xfer_length, srb->virt_addr); - while (srb->total_xfer_length) { - if (debug_enabled(DBG_PIO)) - printk(" %02x", (unsigned char) *(srb->virt_addr)); + while (left_io) { + unsigned char *virt, *base = NULL; + unsigned long flags = 0; + size_t len = left_io; + + if (srb->cmd->use_sg) { + size_t offset = srb->request_length - left_io; + local_irq_save(flags); + /* Again, max 4 bytes */ + base = scsi_kmap_atomic_sg((struct scatterlist *)srb->cmd->request_buffer, + srb->sg_count, &offset, &len); + virt = base + offset; + } else { + virt = srb->cmd->request_buffer + srb->cmd->request_bufflen - left_io; + len = left_io; + } + left_io -= len; + + while (len--) { + if (debug_enabled(DBG_PIO)) + printk(" %02x", *virt); - pio_trigger(); - DC395x_write8(acb, TRM_S1040_SCSI_FIFO, - *(srb->virt_addr)++); + DC395x_write8(acb, TRM_S1040_SCSI_FIFO, *virt++); - sg_subtract_one(srb); + sg_subtract_one(srb); + } + + if (srb->cmd->use_sg) { + scsi_kunmap_atomic_sg(base); + local_irq_restore(flags); + } } if (srb->dcb->sync_period & WIDE_SYNC) { if (ln % 2) { @@ -3319,7 +3335,6 @@ static void pci_unmap_srb_sense(struct AdapterCtlBlk *acb, srb->segment_x[DC395x_MAX_SG_LISTENTRY - 1].address; srb->segment_x[0].length = srb->segment_x[DC395x_MAX_SG_LISTENTRY - 1].length; - srb->virt_addr = srb->virt_addr_req; } @@ -3713,8 +3728,6 @@ static void request_sense(struct AdapterCtlBlk *acb, struct DeviceCtlBlk *dcb, srb->xferred = srb->total_xfer_length; /* srb->segment_x : a one entry of S/G list table */ srb->total_xfer_length = sizeof(cmd->sense_buffer); - srb->virt_addr_req = srb->virt_addr; - srb->virt_addr = cmd->sense_buffer; srb->segment_x[0].length = sizeof(cmd->sense_buffer); /* Map sense buffer */ srb->segment_x[0].address = diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 7b0f9a3..57453ca 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -2350,3 +2350,60 @@ scsi_target_unblock(struct device *dev) device_for_each_child(dev, NULL, target_unblock); } EXPORT_SYMBOL_GPL(scsi_target_unblock); + +/** + * scsi_kmap_atomic_sg - find and atomically map an sg-elemnt + * @sg: scatter-gather list + * @sg_count: number of segments in sg + * @offset: offset in bytes into sg, on return offset into the mapped area + * @len: bytes to map, on return number of bytes mapped + * + * Returns virtual address of the start of the mapped page + */ +void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count, + size_t *offset, size_t *len) +{ + int i; + size_t sg_len = 0, len_complete = 0; + struct page *page; + + for (i = 0; i < sg_count; i++) { + len_complete = sg_len; /* Complete sg-entries */ + sg_len += sg[i].length; + if (sg_len > *offset) + break; + } + + if (unlikely(i == sg_count)) { + printk(KERN_ERR "%s: Bytes in sg: %u, requested offset %u, elements %d\n", + __FUNCTION__, sg_len, *offset, sg_count); + WARN_ON(1); + return NULL; + } + + /* Offset starting from the beginning of first page in this sg-entry */ + *offset = *offset - len_complete + sg[i].offset; + + /* Assumption: contiguous pages can be accessed as "page + i" */ + page = nth_page(sg[i].page, (*offset >> PAGE_SHIFT)); + *offset &= ~PAGE_MASK; + + /* Bytes in this sg-entry from *offset to the end of the page */ + sg_len = PAGE_SIZE - *offset; + if (*len > sg_len) + *len = sg_len; + + return kmap_atomic(page, KM_BIO_SRC_IRQ); +} +EXPORT_SYMBOL(scsi_kmap_atomic_sg); + +/** + * scsi_kunmap_atomic_sg - atomically unmap a virtual address, previously + * mapped with scsi_kmap_atomic_sg + * @virt: virtual address to be unmapped + */ +void scsi_kunmap_atomic_sg(void *virt) +{ + kunmap_atomic(virt, KM_BIO_SRC_IRQ); +} +EXPORT_SYMBOL(scsi_kunmap_atomic_sg); diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h index 1ace1b9..7602b9b 100644 --- a/include/scsi/scsi_cmnd.h +++ b/include/scsi/scsi_cmnd.h @@ -152,4 +152,8 @@ extern void scsi_put_command(struct scsi_cmnd *); extern void scsi_io_completion(struct scsi_cmnd *, unsigned int, unsigned int); extern void scsi_finish_command(struct scsi_cmnd *cmd); +extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count, + size_t *offset, size_t *len); +extern void scsi_kunmap_atomic_sg(void *virt); + #endif /* _SCSI_SCSI_CMND_H */ |
