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author | Boaz Harrosh <bharrosh@panasas.com> | 2007-10-02 23:14:39 +0200 |
---|---|---|
committer | James Bottomley <jejb@mulgrave.localdomain> | 2007-10-12 14:56:05 -0400 |
commit | 3058d5de47ce09ac0e531290566937c7d94d0653 (patch) | |
tree | c8a6a5326370b492bdb45f9c698aa6cba7342763 | |
parent | 884f7fba09646714f94d945162e698f0822a6fdd (diff) | |
download | kernel_samsung_espresso10-3058d5de47ce09ac0e531290566937c7d94d0653.zip kernel_samsung_espresso10-3058d5de47ce09ac0e531290566937c7d94d0653.tar.gz kernel_samsung_espresso10-3058d5de47ce09ac0e531290566937c7d94d0653.tar.bz2 |
[SCSI] gdth: Setup proper per-command private data
- scsi_cmnd and specifically ->SCp of, where heavily abused
with internal meaning members and flags. So introduce a new
struct gdth_cmndinfo, put it on ->host_scribble and define a
gdth_cmnd_priv() accessor to retrieve it from a scsi_cmnd.
- The structure now holds two members:
internal_command - replaces the IS_GDTH_INTERNAL_CMD() croft.
sense_paddr - which was a 64-bit spanning on 2 32-bit members of SCp.
More overloaded members from SCp and scsi_cmnd will be moved in a later
patch (For easy review).
- Split up gdth_queuecommand to an additional internal_function. The later
is the one called by gdth_execute(). This will be more evident later in
the scsi accessors patch, but it also facilitates in the differentiation
between internal_command and external. And the setup of gdth_cmndinfo of
each command.
Signed-off-by Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
-rw-r--r-- | drivers/scsi/gdth.c | 111 | ||||
-rw-r--r-- | drivers/scsi/gdth.h | 10 | ||||
-rw-r--r-- | drivers/scsi/gdth_proc.c | 6 |
3 files changed, 91 insertions, 36 deletions
diff --git a/drivers/scsi/gdth.c b/drivers/scsi/gdth.c index 4248b04..e002c39 100644 --- a/drivers/scsi/gdth.c +++ b/drivers/scsi/gdth.c @@ -86,8 +86,8 @@ /* The meaning of the Scsi_Pointer members in this driver is as follows: * ptr: Chaining * this_residual: Command priority - * buffer: phys. DMA sense buffer - * dma_handle: phys. DMA buffer (kernel >= 2.4.0) + * buffer: unused + * dma_handle: will drop in !use_sg patch. * buffers_residual: Timeout value * Status: Command status (gdth_do_cmd()), DMA mem. mappings * Message: Additional info (gdth_do_cmd()), DMA direction @@ -184,6 +184,8 @@ static int gdth_ioctl(struct inode *inode, struct file *filep, static void gdth_flush(gdth_ha_str *ha); static int gdth_halt(struct notifier_block *nb, ulong event, void *buf); static int gdth_queuecommand(Scsi_Cmnd *scp,void (*done)(Scsi_Cmnd *)); +static int __gdth_queuecommand(gdth_ha_str *ha, struct scsi_cmnd *scp, + struct gdth_cmndinfo *cmndinfo); static void gdth_scsi_done(struct scsi_cmnd *scp); #ifdef DEBUG_GDTH @@ -371,9 +373,6 @@ static const struct file_operations gdth_fops = { .release = gdth_close, }; -#define GDTH_MAGIC 0xc2e7c389 /* I got it from /dev/urandom */ -#define IS_GDTH_INTERNAL_CMD(scp) (scp->underflow == GDTH_MAGIC) - #include "gdth_proc.h" #include "gdth_proc.c" @@ -394,6 +393,34 @@ static gdth_ha_str *gdth_find_ha(int hanum) return NULL; } +static struct gdth_cmndinfo *gdth_get_cmndinfo(gdth_ha_str *ha) +{ + struct gdth_cmndinfo *priv = NULL; + ulong flags; + int i; + + spin_lock_irqsave(&ha->smp_lock, flags); + + for (i=0; i<GDTH_MAXCMDS; ++i) { + if (ha->cmndinfo[i].index == 0) { + priv = &ha->cmndinfo[i]; + priv->index = i+1; + memset(priv, 0, sizeof(*priv)); + break; + } + } + + spin_unlock_irqrestore(&ha->smp_lock, flags); + + return priv; +} + +static void gdth_put_cmndinfo(struct gdth_cmndinfo *priv) +{ + BUG_ON(!priv); + priv->index = 0; +} + static void gdth_delay(int milliseconds) { if (milliseconds == 0) { @@ -405,9 +432,15 @@ static void gdth_delay(int milliseconds) static void gdth_scsi_done(struct scsi_cmnd *scp) { + struct gdth_cmndinfo *cmndinfo = gdth_cmnd_priv(scp); + int internal_command = cmndinfo->internal_command; + TRACE2(("gdth_scsi_done()\n")); - if (IS_GDTH_INTERNAL_CMD(scp)) + gdth_put_cmndinfo(cmndinfo); + scp->host_scribble = NULL; + + if (internal_command) complete((struct completion *)scp->request); else scp->scsi_done(scp); @@ -416,7 +449,9 @@ static void gdth_scsi_done(struct scsi_cmnd *scp) int __gdth_execute(struct scsi_device *sdev, gdth_cmd_str *gdtcmd, char *cmnd, int timeout, u32 *info) { + gdth_ha_str *ha = shost_priv(sdev->host); Scsi_Cmnd *scp; + struct gdth_cmndinfo cmndinfo; DECLARE_COMPLETION_ONSTACK(wait); int rval; @@ -425,6 +460,8 @@ int __gdth_execute(struct scsi_device *sdev, gdth_cmd_str *gdtcmd, char *cmnd, return -ENOMEM; scp->device = sdev; + memset(&cmndinfo, 0, sizeof(cmndinfo)); + /* use request field to save the ptr. to completion struct. */ scp->request = (struct request *)&wait; scp->timeout_per_command = timeout*HZ; @@ -432,8 +469,11 @@ int __gdth_execute(struct scsi_device *sdev, gdth_cmd_str *gdtcmd, char *cmnd, scp->cmd_len = 12; memcpy(scp->cmnd, cmnd, 12); scp->SCp.this_residual = IOCTL_PRI; /* priority */ - scp->underflow = GDTH_MAGIC; - gdth_queuecommand(scp, NULL); + cmndinfo.internal_command = 1; + + TRACE(("__gdth_execute() cmd 0x%x\n", scp->cmnd[0])); + __gdth_queuecommand(ha, scp, &cmndinfo); + wait_for_completion(&wait); rval = scp->SCp.Status; @@ -1966,6 +2006,7 @@ static int gdth_analyse_hdrive(gdth_ha_str *ha, ushort hdrive) static void gdth_putq(gdth_ha_str *ha, Scsi_Cmnd *scp, unchar priority) { + struct gdth_cmndinfo *cmndinfo = gdth_cmnd_priv(scp); register Scsi_Cmnd *pscp; register Scsi_Cmnd *nscp; ulong flags; @@ -1974,7 +2015,7 @@ static void gdth_putq(gdth_ha_str *ha, Scsi_Cmnd *scp, unchar priority) TRACE(("gdth_putq() priority %d\n",priority)); spin_lock_irqsave(&ha->smp_lock, flags); - if (!IS_GDTH_INTERNAL_CMD(scp)) { + if (!cmndinfo->internal_command) { scp->SCp.this_residual = (int)priority; b = scp->device->channel; t = scp->device->id; @@ -2035,7 +2076,7 @@ static void gdth_next(gdth_ha_str *ha) for (nscp = pscp = ha->req_first; nscp; nscp = (Scsi_Cmnd *)nscp->SCp.ptr) { if (nscp != pscp && nscp != (Scsi_Cmnd *)pscp->SCp.ptr) pscp = (Scsi_Cmnd *)pscp->SCp.ptr; - if (!IS_GDTH_INTERNAL_CMD(nscp)) { + if (!gdth_cmnd_priv(nscp)->internal_command) { b = nscp->device->channel; t = nscp->device->id; l = nscp->device->lun; @@ -2060,7 +2101,7 @@ static void gdth_next(gdth_ha_str *ha) firsttime = FALSE; } - if (!IS_GDTH_INTERNAL_CMD(nscp)) { + if (!gdth_cmnd_priv(nscp)->internal_command) { if (nscp->SCp.phase == -1) { nscp->SCp.phase = CACHESERVICE; /* default: cache svc. */ if (nscp->cmnd[0] == TEST_UNIT_READY) { @@ -2123,7 +2164,7 @@ static void gdth_next(gdth_ha_str *ha) else gdth_scsi_done(nscp); } - } else if (IS_GDTH_INTERNAL_CMD(nscp)) { + } else if (gdth_cmnd_priv(nscp)->internal_command) { if (!(cmd_index=gdth_special_cmd(ha, nscp))) this_cmd = FALSE; next_cmd = FALSE; @@ -2622,6 +2663,7 @@ static int gdth_fill_raw_cmd(gdth_ha_str *ha, Scsi_Cmnd *scp, unchar b) unchar t,l; struct page *page; ulong offset; + struct gdth_cmndinfo *cmndinfo; t = scp->device->id; l = scp->device->lun; @@ -2645,6 +2687,7 @@ static int gdth_fill_raw_cmd(gdth_ha_str *ha, Scsi_Cmnd *scp, unchar b) if (ha->cmd_cnt == 0) gdth_set_sema0(ha); + cmndinfo = gdth_cmnd_priv(scp); /* fill command */ if (scp->SCp.sent_command != -1) { cmdp->OpCode = scp->SCp.sent_command; /* special raw cmd. */ @@ -2668,9 +2711,8 @@ static int gdth_fill_raw_cmd(gdth_ha_str *ha, Scsi_Cmnd *scp, unchar b) offset = (ulong)scp->sense_buffer & ~PAGE_MASK; sense_paddr = pci_map_page(ha->pdev,page,offset, 16,PCI_DMA_FROMDEVICE); - *(ulong32 *)&scp->SCp.buffer = (ulong32)sense_paddr; - /* high part, if 64bit */ - *(ulong32 *)&scp->host_scribble = (ulong32)((ulong64)sense_paddr >> 32); + + cmndinfo->sense_paddr = sense_paddr; cmdp->OpCode = GDT_WRITE; /* always */ cmdp->BoardNode = LOCALBOARD; if (mode64) { @@ -3271,6 +3313,7 @@ static int gdth_sync_event(gdth_ha_str *ha, int service, unchar index, gdth_msg_str *msg; gdth_cmd_str *cmdp; unchar b, t; + struct gdth_cmndinfo *cmndinfo = gdth_cmnd_priv(scp); cmdp = ha->pccb; TRACE(("gdth_sync_event() serv %d status %d\n", @@ -3364,14 +3407,9 @@ static int gdth_sync_event(gdth_ha_str *ha, int service, unchar index, else if (scp->SCp.Status == GDTH_MAP_SINGLE) pci_unmap_page(ha->pdev,scp->SCp.dma_handle, scp->request_bufflen,scp->SCp.Message); - if (scp->SCp.buffer) { - dma_addr_t addr; - addr = (dma_addr_t)*(ulong32 *)&scp->SCp.buffer; - if (scp->host_scribble) - addr += (dma_addr_t) - ((ulong64)(*(ulong32 *)&scp->host_scribble) << 32); - pci_unmap_page(ha->pdev,addr,16,PCI_DMA_FROMDEVICE); - } + if (cmndinfo->sense_paddr) + pci_unmap_page(ha->pdev, cmndinfo->sense_paddr, 16, + PCI_DMA_FROMDEVICE); if (ha->status == S_OK) { scp->SCp.Status = S_OK; @@ -3450,7 +3488,7 @@ static int gdth_sync_event(gdth_ha_str *ha, int service, unchar index, scp->sense_buffer[2] = NOT_READY; scp->result = (DID_OK << 16) | (CHECK_CONDITION << 1); } - if (!IS_GDTH_INTERNAL_CMD(scp)) { + if (!cmndinfo->internal_command) { ha->dvr.size = sizeof(ha->dvr.eu.sync); ha->dvr.eu.sync.ionode = ha->hanum; ha->dvr.eu.sync.service = service; @@ -3995,28 +4033,33 @@ static int gdth_queuecommand(struct scsi_cmnd *scp, void (*done)(struct scsi_cmnd *)) { gdth_ha_str *ha = shost_priv(scp->device->host); - int priority; + struct gdth_cmndinfo *cmndinfo; TRACE(("gdth_queuecommand() cmd 0x%x\n", scp->cmnd[0])); - + + cmndinfo = gdth_get_cmndinfo(ha); + BUG_ON(!cmndinfo); + scp->scsi_done = done; + gdth_update_timeout(scp, scp->timeout_per_command * 6); + scp->SCp.this_residual = DEFAULT_PRI; + return __gdth_queuecommand(ha, scp, cmndinfo); +} + +static int __gdth_queuecommand(gdth_ha_str *ha, struct scsi_cmnd *scp, + struct gdth_cmndinfo *cmndinfo) +{ + scp->host_scribble = (unsigned char *)cmndinfo; scp->SCp.have_data_in = 1; scp->SCp.phase = -1; scp->SCp.sent_command = -1; scp->SCp.Status = GDTH_MAP_NONE; - scp->SCp.buffer = (struct scatterlist *)NULL; #ifdef GDTH_STATISTICS ++act_ios; #endif - priority = DEFAULT_PRI; - if (IS_GDTH_INTERNAL_CMD(scp)) - priority = scp->SCp.this_residual; - else - gdth_update_timeout(scp, scp->timeout_per_command * 6); - - gdth_putq(ha, scp, priority); + gdth_putq(ha, scp, scp->SCp.this_residual); gdth_next(ha); return 0; } diff --git a/drivers/scsi/gdth.h b/drivers/scsi/gdth.h index e6178c4..be4ae5a 100644 --- a/drivers/scsi/gdth.h +++ b/drivers/scsi/gdth.h @@ -919,6 +919,11 @@ typedef struct { Scsi_Cmnd *cmnd; /* pending request */ ushort service; /* service */ } cmd_tab[GDTH_MAXCMDS]; /* table of pend. requests */ + struct gdth_cmndinfo { /* per-command private info */ + int index; + int internal_command; /* don't call scsi_done */ + dma_addr_t sense_paddr; /* sense dma-addr */ + } cmndinfo[GDTH_MAXCMDS]; /* index==0 is free */ unchar bus_cnt; /* SCSI bus count */ unchar tid_cnt; /* Target ID count */ unchar bus_id[MAXBUS]; /* IOP IDs */ @@ -941,6 +946,11 @@ typedef struct { struct scsi_device *sdev; } gdth_ha_str; +static inline struct gdth_cmndinfo *gdth_cmnd_priv(struct scsi_cmnd* cmd) +{ + return (struct gdth_cmndinfo *)cmd->host_scribble; +} + /* INQUIRY data format */ typedef struct { unchar type_qual; diff --git a/drivers/scsi/gdth_proc.c b/drivers/scsi/gdth_proc.c index fe070ab..ad1b60d 100644 --- a/drivers/scsi/gdth_proc.c +++ b/drivers/scsi/gdth_proc.c @@ -758,7 +758,8 @@ static void gdth_stop_timeout(gdth_ha_str *ha, int busnum, int id) spin_lock_irqsave(&ha->smp_lock, flags); for (scp = ha->req_first; scp; scp = (Scsi_Cmnd *)scp->SCp.ptr) { - if (!IS_GDTH_INTERNAL_CMD(scp)) { + struct gdth_cmndinfo *cmndinfo = gdth_cmnd_priv(scp); + if (!cmndinfo->internal_command) { b = scp->device->channel; t = scp->device->id; if (t == (unchar)id && b == (unchar)busnum) { @@ -779,7 +780,8 @@ static void gdth_start_timeout(gdth_ha_str *ha, int busnum, int id) spin_lock_irqsave(&ha->smp_lock, flags); for (scp = ha->req_first; scp; scp = (Scsi_Cmnd *)scp->SCp.ptr) { - if (!IS_GDTH_INTERNAL_CMD(scp)) { + struct gdth_cmndinfo *cmndinfo = gdth_cmnd_priv(scp); + if (!cmndinfo->internal_command) { b = scp->device->channel; t = scp->device->id; if (t == (unchar)id && b == (unchar)busnum) { |