cciss: add performant mode support for Stars/Sirius
Add a mode of controller operation called Performant Mode. Even though
cciss has been deprecated in favor of hpsa there are new controllers due
out next year that HP must support in older vendor distros. Vendors
require all fixes/features be upstream. These new controllers support
only 16 commands in simple mode but support up to 1024 in performant mode.
This requires us to add this support at this late date.
The performant mode transport minimizes host PCI accesses by performinf
many completions per read. PCI writes are posted so the host can write
then immediately get off the bus not waiting for the writwe to complete to
the target. In the context of performant mode the host read out to a
controller pulls all posted writes into host memory ensuring the reply
queue is coherent.
Signed-off-by: Mike Miller <mike.miller@hp.com>
Cc: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/drivers/block/cciss_scsi.c b/drivers/block/cciss_scsi.c
index 72dae92..48be478 100644
--- a/drivers/block/cciss_scsi.c
+++ b/drivers/block/cciss_scsi.c
@@ -93,8 +93,8 @@
#pragma pack(1)
-#define SCSI_PAD_32 0
-#define SCSI_PAD_64 0
+#define SCSI_PAD_32 8
+#define SCSI_PAD_64 8
struct cciss_scsi_cmd_stack_elem_t {
CommandList_struct cmd;
@@ -213,6 +213,8 @@
/* Check alignment, see cciss_cmd.h near CommandList_struct def. */
BUILD_BUG_ON((sizeof(*stk->pool) % COMMANDLIST_ALIGNMENT) != 0);
+ /* printk(KERN_WARNING "cciss_scsi.c: 0x%08x 0x%08x 0x%08x\n",
+ 0xdeadbeef, sizeof(*stk->pool), 0xbeefdead); */
/* pci_alloc_consistent guarantees 32-bit DMA address will be used */
stk->pool = (struct cciss_scsi_cmd_stack_elem_t *)
pci_alloc_consistent(hba[ctlr]->pdev, size, &stk->cmd_pool_handle);