diff options
author | Boaz Harrosh <bharrosh@panasas.com> | 2007-10-03 01:18:03 +0400 |
---|---|---|
committer | James Bottomley <jejb@mulgrave.localdomain> | 2007-10-12 22:56:13 +0400 |
commit | 3892d88ae6fb186ff6205f764213b556d70800b0 (patch) | |
tree | 5435ca13a3d70569582887813a92f49a0ac7ca7c /drivers | |
parent | f842b64e0ffbcc9ce48a3bf799d0b005094107c1 (diff) | |
download | linux-3892d88ae6fb186ff6205f764213b556d70800b0.tar.xz |
[SCSI] gdth: !use_sg cleanup and use of scsi accessors
gdth_execute() will issue an internal, none scsi-standard commands
onto __gdth_queuecommand(). Since it is not recommended to set
struct scsi_cmnd IO members in llds, gdth now uses internal IO
members for IO. In the case of gdth_execute() these members will be
set properly. In case the command was issued from scsi-ml
(by gdth_queuecommand) they will be set from scsi IO accessors.
* define gdth IO accessors and use them throughout the driver.
* use an sg-of-one in gdth_execute() and fix gdth_special_cmd()
accordingly.
* Clean the not use_sg code path and company
Signed-off-by Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/scsi/gdth.c | 228 | ||||
-rw-r--r-- | drivers/scsi/gdth.h | 7 |
2 files changed, 109 insertions, 126 deletions
diff --git a/drivers/scsi/gdth.c b/drivers/scsi/gdth.c index a68004b0d90b..0153d1d8b12e 100644 --- a/drivers/scsi/gdth.c +++ b/drivers/scsi/gdth.c @@ -85,11 +85,11 @@ /* The meaning of the Scsi_Pointer members in this driver is as follows: * ptr: Chaining - * this_residual: unused - * buffer: unused - * dma_handle: will drop in !use_sg patch. - * buffers_residual: unused - * Status: DMA mem. mappings (FIXME: drop in !use_sg patch.) + * this_residual: gdth_bufflen + * buffer: gdth_sglist + * dma_handle: unused + * buffers_residual: gdth_sg_count + * Status: unused * Message: unused * have_data_in: unused * sent_command: unused @@ -132,6 +132,7 @@ #include <asm/uaccess.h> #include <linux/spinlock.h> #include <linux/blkdev.h> +#include <linux/scatterlist.h> #include "scsi.h" #include <scsi/scsi_host.h> @@ -159,7 +160,7 @@ static void gdth_readapp_event(gdth_ha_str *ha, unchar application, static void gdth_clear_events(void); static void gdth_copy_internal_data(gdth_ha_str *ha, Scsi_Cmnd *scp, - char *buffer,ushort count); + char *buffer, ushort count, int to_buffer); static int gdth_internal_cache_cmd(gdth_ha_str *ha, Scsi_Cmnd *scp); static int gdth_fill_cache_cmd(gdth_ha_str *ha, Scsi_Cmnd *scp, ushort hdrive); @@ -373,6 +374,47 @@ static const struct file_operations gdth_fops = { .release = gdth_close, }; +/* + * gdth scsi_command access wrappers. + * below 6 functions are used throughout the driver to access scsi_command's + * io parameters. The reason we do not use the regular accessors from + * scsi_cmnd.h is because of gdth_execute(). Since it is unrecommended for + * llds to directly set scsi_cmnd's IO members. This driver will use SCp + * members for IO parameters, and will copy scsi_cmnd's members to Scp + * members in queuecommand. For internal commands through gdth_execute() + * SCp's members will be set directly. + */ +static inline unsigned gdth_bufflen(struct scsi_cmnd *cmd) +{ + return (unsigned)cmd->SCp.this_residual; +} + +static inline void gdth_set_bufflen(struct scsi_cmnd *cmd, unsigned bufflen) +{ + cmd->SCp.this_residual = bufflen; +} + +static inline unsigned gdth_sg_count(struct scsi_cmnd *cmd) +{ + return (unsigned)cmd->SCp.buffers_residual; +} + +static inline void gdth_set_sg_count(struct scsi_cmnd *cmd, unsigned sg_count) +{ + cmd->SCp.buffers_residual = sg_count; +} + +static inline struct scatterlist *gdth_sglist(struct scsi_cmnd *cmd) +{ + return cmd->SCp.buffer; +} + +static inline void gdth_set_sglist(struct scsi_cmnd *cmd, + struct scatterlist *sglist) +{ + cmd->SCp.buffer = sglist; +} + #include "gdth_proc.h" #include "gdth_proc.c" @@ -452,6 +494,7 @@ int __gdth_execute(struct scsi_device *sdev, gdth_cmd_str *gdtcmd, char *cmnd, gdth_ha_str *ha = shost_priv(sdev->host); Scsi_Cmnd *scp; struct gdth_cmndinfo cmndinfo; + struct scatterlist one_sg; DECLARE_COMPLETION_ONSTACK(wait); int rval; @@ -465,7 +508,10 @@ int __gdth_execute(struct scsi_device *sdev, gdth_cmd_str *gdtcmd, char *cmnd, /* use request field to save the ptr. to completion struct. */ scp->request = (struct request *)&wait; scp->timeout_per_command = timeout*HZ; - scp->request_buffer = gdtcmd; + sg_init_one(&one_sg, gdtcmd, sizeof(*gdtcmd)); + gdth_set_sglist(scp, &one_sg); + gdth_set_sg_count(scp, 1); + gdth_set_bufflen(scp, sizeof(*gdtcmd)); scp->cmd_len = 12; memcpy(scp->cmnd, cmnd, 12); cmndinfo.priority = IOCTL_PRI; @@ -2303,24 +2349,28 @@ static void gdth_next(gdth_ha_str *ha) ha->hanum, cmd_index); } } - + +/* + * gdth_copy_internal_data() - copy to/from a buffer onto a scsi_cmnd's + * buffers, kmap_atomic() as needed. + */ static void gdth_copy_internal_data(gdth_ha_str *ha, Scsi_Cmnd *scp, - char *buffer,ushort count) + char *buffer, ushort count, int to_buffer) { - ushort cpcount,i; + ushort cpcount,i, max_sg = gdth_sg_count(scp); ushort cpsum,cpnow; struct scatterlist *sl; char *address; - cpcount = count<=(ushort)scp->request_bufflen ? count:(ushort)scp->request_bufflen; + cpcount = min_t(ushort, count, gdth_bufflen(scp)); - if (scp->use_sg) { - sl = (struct scatterlist *)scp->request_buffer; - for (i=0,cpsum=0; i<scp->use_sg; ++i,++sl) { + if (cpcount) { + cpsum=0; + scsi_for_each_sg(scp, sl, max_sg, i) { unsigned long flags; cpnow = (ushort)sl->length; TRACE(("copy_internal() now %d sum %d count %d %d\n", - cpnow,cpsum,cpcount,(ushort)scp->bufflen)); + cpnow, cpsum, cpcount, gdth_bufflen(scp))); if (cpsum+cpnow > cpcount) cpnow = cpcount - cpsum; cpsum += cpnow; @@ -2331,7 +2381,10 @@ static void gdth_copy_internal_data(gdth_ha_str *ha, Scsi_Cmnd *scp, } local_irq_save(flags); address = kmap_atomic(sl->page, KM_BIO_SRC_IRQ) + sl->offset; - memcpy(address,buffer,cpnow); + if (to_buffer) + memcpy(buffer, address, cpnow); + else + memcpy(address, buffer, cpnow); flush_dcache_page(sl->page); kunmap_atomic(address, KM_BIO_SRC_IRQ); local_irq_restore(flags); @@ -2339,9 +2392,10 @@ static void gdth_copy_internal_data(gdth_ha_str *ha, Scsi_Cmnd *scp, break; buffer += cpnow; } - } else { - TRACE(("copy_internal() count %d\n",cpcount)); - memcpy((char*)scp->request_buffer,buffer,cpcount); + } else if (count) { + printk("GDT-HA %d: SCSI command with no buffers but data transfer expected!\n", + ha->hanum); + WARN_ON(1); } } @@ -2384,7 +2438,7 @@ static int gdth_internal_cache_cmd(gdth_ha_str *ha, Scsi_Cmnd *scp) strcpy(inq.vendor,ha->oem_name); sprintf(inq.product,"Host Drive #%02d",t); strcpy(inq.revision," "); - gdth_copy_internal_data(ha, scp, (char*)&inq, sizeof(gdth_inq_data)); + gdth_copy_internal_data(ha, scp, (char*)&inq, sizeof(gdth_inq_data), 0); break; case REQUEST_SENSE: @@ -2394,7 +2448,7 @@ static int gdth_internal_cache_cmd(gdth_ha_str *ha, Scsi_Cmnd *scp) sd.key = NO_SENSE; sd.info = 0; sd.add_length= 0; - gdth_copy_internal_data(ha, scp, (char*)&sd, sizeof(gdth_sense_data)); + gdth_copy_internal_data(ha, scp, (char*)&sd, sizeof(gdth_sense_data), 0); break; case MODE_SENSE: @@ -2406,7 +2460,7 @@ static int gdth_internal_cache_cmd(gdth_ha_str *ha, Scsi_Cmnd *scp) mpd.bd.block_length[0] = (SECTOR_SIZE & 0x00ff0000) >> 16; mpd.bd.block_length[1] = (SECTOR_SIZE & 0x0000ff00) >> 8; mpd.bd.block_length[2] = (SECTOR_SIZE & 0x000000ff); - gdth_copy_internal_data(ha, scp, (char*)&mpd, sizeof(gdth_modep_data)); + gdth_copy_internal_data(ha, scp, (char*)&mpd, sizeof(gdth_modep_data), 0); break; case READ_CAPACITY: @@ -2416,7 +2470,7 @@ static int gdth_internal_cache_cmd(gdth_ha_str *ha, Scsi_Cmnd *scp) else rdc.last_block_no = cpu_to_be32(ha->hdr[t].size-1); rdc.block_length = cpu_to_be32(SECTOR_SIZE); - gdth_copy_internal_data(ha, scp, (char*)&rdc, sizeof(gdth_rdcap_data)); + gdth_copy_internal_data(ha, scp, (char*)&rdc, sizeof(gdth_rdcap_data), 0); break; case SERVICE_ACTION_IN: @@ -2428,7 +2482,7 @@ static int gdth_internal_cache_cmd(gdth_ha_str *ha, Scsi_Cmnd *scp) rdc16.last_block_no = cpu_to_be64(ha->hdr[t].size-1); rdc16.block_length = cpu_to_be32(SECTOR_SIZE); gdth_copy_internal_data(ha, scp, (char*)&rdc16, - sizeof(gdth_rdcap16_data)); + sizeof(gdth_rdcap16_data), 0); } else { scp->result = DID_ABORT << 16; } @@ -2451,13 +2505,9 @@ static int gdth_fill_cache_cmd(gdth_ha_str *ha, Scsi_Cmnd *scp, ushort hdrive) { register gdth_cmd_str *cmdp; struct gdth_cmndinfo *cmndinfo = gdth_cmnd_priv(scp); - struct scatterlist *sl; ulong32 cnt, blockcnt; ulong64 no, blockno; - dma_addr_t phys_addr; int i, cmd_index, read_write, sgcnt, mode64; - struct page *page; - ulong offset; cmdp = ha->pccb; TRACE(("gdth_fill_cache_cmd() cmd 0x%x cmdsize %d hdrive %d\n", @@ -2546,17 +2596,17 @@ static int gdth_fill_cache_cmd(gdth_ha_str *ha, Scsi_Cmnd *scp, ushort hdrive) cmdp->u.cache.BlockCnt = blockcnt; } - if (scp->use_sg) { - sl = (struct scatterlist *)scp->request_buffer; - sgcnt = scp->use_sg; - scp->SCp.Status = GDTH_MAP_SG; + if (gdth_bufflen(scp)) { cmndinfo->dma_dir = (read_write == 1 ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE); - sgcnt = pci_map_sg(ha->pdev, sl, scp->use_sg, cmndinfo->dma_dir); + sgcnt = pci_map_sg(ha->pdev, gdth_sglist(scp), gdth_sg_count(scp), + cmndinfo->dma_dir); if (mode64) { + struct scatterlist *sl; + cmdp->u.cache64.DestAddr= (ulong64)-1; cmdp->u.cache64.sg_canz = sgcnt; - for (i=0; i<sgcnt; ++i,++sl) { + scsi_for_each_sg(scp, sl, sgcnt, i) { cmdp->u.cache64.sg_lst[i].sg_ptr = sg_dma_address(sl); #ifdef GDTH_DMA_STATISTICS if (cmdp->u.cache64.sg_lst[i].sg_ptr > (ulong64)0xffffffff) @@ -2567,9 +2617,11 @@ static int gdth_fill_cache_cmd(gdth_ha_str *ha, Scsi_Cmnd *scp, ushort hdrive) cmdp->u.cache64.sg_lst[i].sg_len = sg_dma_len(sl); } } else { + struct scatterlist *sl; + cmdp->u.cache.DestAddr= 0xffffffff; cmdp->u.cache.sg_canz = sgcnt; - for (i=0; i<sgcnt; ++i,++sl) { + scsi_for_each_sg(scp, sl, sgcnt, i) { cmdp->u.cache.sg_lst[i].sg_ptr = sg_dma_address(sl); #ifdef GDTH_DMA_STATISTICS ha->dma32_cnt++; @@ -2585,38 +2637,6 @@ static int gdth_fill_cache_cmd(gdth_ha_str *ha, Scsi_Cmnd *scp, ushort hdrive) } #endif - } else if (scp->request_bufflen) { - scp->SCp.Status = GDTH_MAP_SINGLE; - cmndinfo->dma_dir = (read_write == 1 ? - PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE); - page = virt_to_page(scp->request_buffer); - offset = (ulong)scp->request_buffer & ~PAGE_MASK; - phys_addr = pci_map_page(ha->pdev,page,offset, - scp->request_bufflen, cmndinfo->dma_dir); - scp->SCp.dma_handle = phys_addr; - if (mode64) { - if (ha->cache_feat & SCATTER_GATHER) { - cmdp->u.cache64.DestAddr = (ulong64)-1; - cmdp->u.cache64.sg_canz = 1; - cmdp->u.cache64.sg_lst[0].sg_ptr = phys_addr; - cmdp->u.cache64.sg_lst[0].sg_len = scp->request_bufflen; - cmdp->u.cache64.sg_lst[1].sg_len = 0; - } else { - cmdp->u.cache64.DestAddr = phys_addr; - cmdp->u.cache64.sg_canz= 0; - } - } else { - if (ha->cache_feat & SCATTER_GATHER) { - cmdp->u.cache.DestAddr = 0xffffffff; - cmdp->u.cache.sg_canz = 1; - cmdp->u.cache.sg_lst[0].sg_ptr = phys_addr; - cmdp->u.cache.sg_lst[0].sg_len = scp->request_bufflen; - cmdp->u.cache.sg_lst[1].sg_len = 0; - } else { - cmdp->u.cache.DestAddr = phys_addr; - cmdp->u.cache.sg_canz= 0; - } - } } } /* evaluate command size, check space */ @@ -2659,9 +2679,8 @@ static int gdth_fill_cache_cmd(gdth_ha_str *ha, Scsi_Cmnd *scp, ushort hdrive) static int gdth_fill_raw_cmd(gdth_ha_str *ha, Scsi_Cmnd *scp, unchar b) { register gdth_cmd_str *cmdp; - struct scatterlist *sl; ushort i; - dma_addr_t phys_addr, sense_paddr; + dma_addr_t sense_paddr; int cmd_index, sgcnt, mode64; unchar t,l; struct page *page; @@ -2727,7 +2746,7 @@ static int gdth_fill_raw_cmd(gdth_ha_str *ha, Scsi_Cmnd *scp, unchar b) cmdp->u.raw64.lun = l; cmdp->u.raw64.bus = b; cmdp->u.raw64.priority = 0; - cmdp->u.raw64.sdlen = scp->request_bufflen; + cmdp->u.raw64.sdlen = gdth_bufflen(scp); cmdp->u.raw64.sense_len = 16; cmdp->u.raw64.sense_data = sense_paddr; cmdp->u.raw64.direction = @@ -2744,7 +2763,7 @@ static int gdth_fill_raw_cmd(gdth_ha_str *ha, Scsi_Cmnd *scp, unchar b) cmdp->u.raw.bus = b; cmdp->u.raw.priority = 0; cmdp->u.raw.link_p = 0; - cmdp->u.raw.sdlen = scp->request_bufflen; + cmdp->u.raw.sdlen = gdth_bufflen(scp); cmdp->u.raw.sense_len = 16; cmdp->u.raw.sense_data = sense_paddr; cmdp->u.raw.direction = @@ -2753,16 +2772,16 @@ static int gdth_fill_raw_cmd(gdth_ha_str *ha, Scsi_Cmnd *scp, unchar b) cmdp->u.raw.sg_ranz = 0; } - if (scp->use_sg) { - sl = (struct scatterlist *)scp->request_buffer; - sgcnt = scp->use_sg; - scp->SCp.Status = GDTH_MAP_SG; + if (gdth_bufflen(scp)) { cmndinfo->dma_dir = PCI_DMA_BIDIRECTIONAL; - sgcnt = pci_map_sg(ha->pdev,sl, scp->use_sg, cmndinfo->dma_dir); + sgcnt = pci_map_sg(ha->pdev, gdth_sglist(scp), gdth_sg_count(scp), + cmndinfo->dma_dir); if (mode64) { + struct scatterlist *sl; + cmdp->u.raw64.sdata = (ulong64)-1; cmdp->u.raw64.sg_ranz = sgcnt; - for (i=0; i<sgcnt; ++i,++sl) { + scsi_for_each_sg(scp, sl, sgcnt, i) { cmdp->u.raw64.sg_lst[i].sg_ptr = sg_dma_address(sl); #ifdef GDTH_DMA_STATISTICS if (cmdp->u.raw64.sg_lst[i].sg_ptr > (ulong64)0xffffffff) @@ -2773,9 +2792,11 @@ static int gdth_fill_raw_cmd(gdth_ha_str *ha, Scsi_Cmnd *scp, unchar b) cmdp->u.raw64.sg_lst[i].sg_len = sg_dma_len(sl); } } else { + struct scatterlist *sl; + cmdp->u.raw.sdata = 0xffffffff; cmdp->u.raw.sg_ranz = sgcnt; - for (i=0; i<sgcnt; ++i,++sl) { + scsi_for_each_sg(scp, sl, sgcnt, i) { cmdp->u.raw.sg_lst[i].sg_ptr = sg_dma_address(sl); #ifdef GDTH_DMA_STATISTICS ha->dma32_cnt++; @@ -2791,38 +2812,6 @@ static int gdth_fill_raw_cmd(gdth_ha_str *ha, Scsi_Cmnd *scp, unchar b) } #endif - } else if (scp->request_bufflen) { - scp->SCp.Status = GDTH_MAP_SINGLE; - cmndinfo->dma_dir = PCI_DMA_BIDIRECTIONAL; - page = virt_to_page(scp->request_buffer); - offset = (ulong)scp->request_buffer & ~PAGE_MASK; - phys_addr = pci_map_page(ha->pdev,page,offset, - scp->request_bufflen, cmndinfo->dma_dir); - scp->SCp.dma_handle = phys_addr; - - if (mode64) { - if (ha->raw_feat & SCATTER_GATHER) { - cmdp->u.raw64.sdata = (ulong64)-1; - cmdp->u.raw64.sg_ranz= 1; - cmdp->u.raw64.sg_lst[0].sg_ptr = phys_addr; - cmdp->u.raw64.sg_lst[0].sg_len = scp->request_bufflen; - cmdp->u.raw64.sg_lst[1].sg_len = 0; - } else { - cmdp->u.raw64.sdata = phys_addr; - cmdp->u.raw64.sg_ranz= 0; - } - } else { - if (ha->raw_feat & SCATTER_GATHER) { - cmdp->u.raw.sdata = 0xffffffff; - cmdp->u.raw.sg_ranz= 1; - cmdp->u.raw.sg_lst[0].sg_ptr = phys_addr; - cmdp->u.raw.sg_lst[0].sg_len = scp->request_bufflen; - cmdp->u.raw.sg_lst[1].sg_len = 0; - } else { - cmdp->u.raw.sdata = phys_addr; - cmdp->u.raw.sg_ranz= 0; - } - } } if (mode64) { TRACE(("raw cmd: addr. %x sganz %x sgptr0 %x sglen0 %x\n", @@ -2871,7 +2860,7 @@ static int gdth_special_cmd(gdth_ha_str *ha, Scsi_Cmnd *scp) if (ha->type==GDT_EISA && ha->cmd_cnt>0) return 0; - memcpy( cmdp, scp->request_buffer, sizeof(gdth_cmd_str)); + gdth_copy_internal_data(ha, scp, (char *)cmdp, sizeof(gdth_cmd_str), 1); cmdp->RequestBuffer = scp; /* search free command index */ @@ -3404,12 +3393,10 @@ static int gdth_sync_event(gdth_ha_str *ha, int service, unchar index, /* retry */ return 2; } - if (scp->SCp.Status == GDTH_MAP_SG) - pci_unmap_sg(ha->pdev,scp->request_buffer, - scp->use_sg, cmndinfo->dma_dir); - else if (scp->SCp.Status == GDTH_MAP_SINGLE) - pci_unmap_page(ha->pdev,scp->SCp.dma_handle, - scp->request_bufflen, cmndinfo->dma_dir); + if (gdth_bufflen(scp)) + pci_unmap_sg(ha->pdev, gdth_sglist(scp), gdth_sg_count(scp), + cmndinfo->dma_dir); + if (cmndinfo->sense_paddr) pci_unmap_page(ha->pdev, cmndinfo->sense_paddr, 16, PCI_DMA_FROMDEVICE); @@ -4046,6 +4033,11 @@ static int gdth_queuecommand(struct scsi_cmnd *scp, scp->scsi_done = done; gdth_update_timeout(scp, scp->timeout_per_command * 6); cmndinfo->priority = DEFAULT_PRI; + + gdth_set_bufflen(scp, scsi_bufflen(scp)); + gdth_set_sg_count(scp, scsi_sg_count(scp)); + gdth_set_sglist(scp, scsi_sglist(scp)); + return __gdth_queuecommand(ha, scp, cmndinfo); } @@ -4056,7 +4048,6 @@ static int __gdth_queuecommand(gdth_ha_str *ha, struct scsi_cmnd *scp, cmndinfo->wait_for_completion = 1; cmndinfo->phase = -1; cmndinfo->OpCode = -1; - scp->SCp.Status = GDTH_MAP_NONE; #ifdef GDTH_STATISTICS ++act_ios; @@ -4626,7 +4617,6 @@ static int gdth_ioctl(struct inode *inode, struct file *filep, return -ENOMEM; scp->device = ha->sdev; scp->cmd_len = 12; - scp->use_sg = 0; scp->device->channel = res.number; rval = gdth_eh_bus_reset(scp); res.status = (rval == SUCCESS ? S_OK : S_GENERR); diff --git a/drivers/scsi/gdth.h b/drivers/scsi/gdth.h index 25803a8f31de..1434c6b0297c 100644 --- a/drivers/scsi/gdth.h +++ b/drivers/scsi/gdth.h @@ -303,15 +303,8 @@ #define MAILBOXREG 0x0c90 /* mailbox reg. (16 bytes) */ #define EISAREG 0x0cc0 /* EISA configuration */ -/* DMA memory mappings */ -#define GDTH_MAP_NONE 0 -#define GDTH_MAP_SINGLE 1 -#define GDTH_MAP_SG 2 -#define GDTH_MAP_IOCTL 3 - /* other defines */ #define LINUX_OS 8 /* used for cache optim. */ -#define SCATTER_GATHER 1 /* s/g feature */ #define SECS32 0x1f /* round capacity */ #define BIOS_ID_OFFS 0x10 /* offset contr-ID in ISABIOS */ #define LOCALBOARD 0 /* board node always 0 */ |