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authorJames Bottomley <James.Bottomley@SteelEye.com>2005-10-01 09:38:05 -0500
committerJames Bottomley <jejb@mulgrave.(none)>2005-10-03 08:39:48 -0500
commit51c928c34fa7cff38df584ad01de988805877dba (patch)
tree7900dfd128a2a40d6c924a38e5d9244e91342205 /drivers/scsi/megaraid.c
parent97af50f60ff1202b0dd9ce481d4cf98c6a578bec (diff)
[SCSI] Legacy MegaRAID: Fix READ CAPACITY
Some Legacy megaraid cards can't actually cope with the scatter/gather version of the READ CAPACITY command (which is what we now send them since altering all SCSI internal I/O to go via the block layer). Fix this (and a few other broken megaraid driver assumptions) by sending the non-sg version of the command if the sg list only has a single element. Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers/scsi/megaraid.c')
-rw-r--r--drivers/scsi/megaraid.c70
1 files changed, 50 insertions, 20 deletions
diff --git a/drivers/scsi/megaraid.c b/drivers/scsi/megaraid.c
index 6f308ebe3e79..61a6fd810bb4 100644
--- a/drivers/scsi/megaraid.c
+++ b/drivers/scsi/megaraid.c
@@ -621,8 +621,6 @@ mega_build_cmd(adapter_t *adapter, Scsi_Cmnd *cmd, int *busy)
if(islogical) {
switch (cmd->cmnd[0]) {
case TEST_UNIT_READY:
- memset(cmd->request_buffer, 0, cmd->request_bufflen);
-
#if MEGA_HAVE_CLUSTERING
/*
* Do we support clustering and is the support enabled
@@ -652,11 +650,28 @@ mega_build_cmd(adapter_t *adapter, Scsi_Cmnd *cmd, int *busy)
return NULL;
#endif
- case MODE_SENSE:
+ case MODE_SENSE: {
+ char *buf;
+
+ if (cmd->use_sg) {
+ struct scatterlist *sg;
+
+ sg = (struct scatterlist *)cmd->request_buffer;
+ buf = kmap_atomic(sg->page, KM_IRQ0) +
+ sg->offset;
+ } else
+ buf = cmd->request_buffer;
memset(cmd->request_buffer, 0, cmd->cmnd[4]);
+ if (cmd->use_sg) {
+ struct scatterlist *sg;
+
+ sg = (struct scatterlist *)cmd->request_buffer;
+ kunmap_atomic(buf - sg->offset, KM_IRQ0);
+ }
cmd->result = (DID_OK << 16);
cmd->scsi_done(cmd);
return NULL;
+ }
case READ_CAPACITY:
case INQUIRY:
@@ -1685,14 +1700,23 @@ mega_rundoneq (adapter_t *adapter)
static void
mega_free_scb(adapter_t *adapter, scb_t *scb)
{
+ unsigned long length;
+
switch( scb->dma_type ) {
case MEGA_DMA_TYPE_NONE:
break;
case MEGA_BULK_DATA:
+ if (scb->cmd->use_sg == 0)
+ length = scb->cmd->request_bufflen;
+ else {
+ struct scatterlist *sgl =
+ (struct scatterlist *)scb->cmd->request_buffer;
+ length = sgl->length;
+ }
pci_unmap_page(adapter->dev, scb->dma_h_bulkdata,
- scb->cmd->request_bufflen, scb->dma_direction);
+ length, scb->dma_direction);
break;
case MEGA_SGLIST:
@@ -1741,6 +1765,7 @@ mega_build_sglist(adapter_t *adapter, scb_t *scb, u32 *buf, u32 *len)
struct scatterlist *sgl;
struct page *page;
unsigned long offset;
+ unsigned int length;
Scsi_Cmnd *cmd;
int sgcnt;
int idx;
@@ -1748,14 +1773,23 @@ mega_build_sglist(adapter_t *adapter, scb_t *scb, u32 *buf, u32 *len)
cmd = scb->cmd;
/* Scatter-gather not used */
- if( !cmd->use_sg ) {
-
- page = virt_to_page(cmd->request_buffer);
- offset = offset_in_page(cmd->request_buffer);
+ if( cmd->use_sg == 0 || (cmd->use_sg == 1 &&
+ !adapter->has_64bit_addr)) {
+
+ if (cmd->use_sg == 0) {
+ page = virt_to_page(cmd->request_buffer);
+ offset = offset_in_page(cmd->request_buffer);
+ length = cmd->request_bufflen;
+ } else {
+ sgl = (struct scatterlist *)cmd->request_buffer;
+ page = sgl->page;
+ offset = sgl->offset;
+ length = sgl->length;
+ }
scb->dma_h_bulkdata = pci_map_page(adapter->dev,
page, offset,
- cmd->request_bufflen,
+ length,
scb->dma_direction);
scb->dma_type = MEGA_BULK_DATA;
@@ -1765,14 +1799,14 @@ mega_build_sglist(adapter_t *adapter, scb_t *scb, u32 *buf, u32 *len)
*/
if( adapter->has_64bit_addr ) {
scb->sgl64[0].address = scb->dma_h_bulkdata;
- scb->sgl64[0].length = cmd->request_bufflen;
+ scb->sgl64[0].length = length;
*buf = (u32)scb->sgl_dma_addr;
- *len = (u32)cmd->request_bufflen;
+ *len = (u32)length;
return 1;
}
else {
*buf = (u32)scb->dma_h_bulkdata;
- *len = (u32)cmd->request_bufflen;
+ *len = (u32)length;
}
return 0;
}
@@ -1791,27 +1825,23 @@ mega_build_sglist(adapter_t *adapter, scb_t *scb, u32 *buf, u32 *len)
if( sgcnt > adapter->sglen ) BUG();
+ *len = 0;
+
for( idx = 0; idx < sgcnt; idx++, sgl++ ) {
if( adapter->has_64bit_addr ) {
scb->sgl64[idx].address = sg_dma_address(sgl);
- scb->sgl64[idx].length = sg_dma_len(sgl);
+ *len += scb->sgl64[idx].length = sg_dma_len(sgl);
}
else {
scb->sgl[idx].address = sg_dma_address(sgl);
- scb->sgl[idx].length = sg_dma_len(sgl);
+ *len += scb->sgl[idx].length = sg_dma_len(sgl);
}
}
/* Reset pointer and length fields */
*buf = scb->sgl_dma_addr;
- /*
- * For passthru command, dataxferlen must be set, even for commands
- * with a sg list
- */
- *len = (u32)cmd->request_bufflen;
-
/* Return count of SG requests */
return sgcnt;
}