cciss: Inform controller we are using 32-bit tags.

Controller will DMA only 32-bits of the tag per command
on completion if it knows we are only using 32-bit tags.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 0a296c1eff4ff97dd34c16cf194964514541bc26..27b04a32b0c5f884dd54175ebddb76844f717be0 100644 (file)
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -231,7 +231,7 @@ static const struct block_device_operations cciss_fops = {
  */
 static void set_performant_mode(ctlr_info_t *h, CommandList_struct *c)
 {
-       if (likely(h->transMethod == CFGTBL_Trans_Performant))
+       if (likely(h->transMethod & CFGTBL_Trans_Performant))
                c->busaddr |= 1 | (h->blockFetchTable[c->Header.SGList] << 1);
 }
 
@@ -3175,10 +3175,13 @@ static inline u32 cciss_tag_to_index(u32 tag)
        return tag >> DIRECT_LOOKUP_SHIFT;
 }
 
-static inline u32 cciss_tag_discard_error_bits(u32 tag)
+static inline u32 cciss_tag_discard_error_bits(ctlr_info_t *h, u32 tag)
 {
-#define CCISS_ERROR_BITS 0x03
-       return tag & ~CCISS_ERROR_BITS;
+#define CCISS_PERF_ERROR_BITS ((1 << DIRECT_LOOKUP_SHIFT) - 1)
+#define CCISS_SIMPLE_ERROR_BITS 0x03
+       if (likely(h->transMethod & CFGTBL_Trans_Performant))
+               return tag & ~CCISS_PERF_ERROR_BITS;
+       return tag & ~CCISS_SIMPLE_ERROR_BITS;
 }
 
 static inline void cciss_mark_tag_indexed(u32 *tag)
@@ -3398,7 +3401,7 @@ static inline u32 next_command(ctlr_info_t *h)
 {
        u32 a;
 
-       if (unlikely(h->transMethod != CFGTBL_Trans_Performant))
+       if (unlikely(!(h->transMethod & CFGTBL_Trans_Performant)))
                return h->access.command_completed(h);
 
        if ((*(h->reply_pool_head) & 1) == (h->reply_pool_wraparound)) {
@@ -3436,9 +3439,9 @@ static inline u32 process_nonindexed_cmd(ctlr_info_t *h, u32 raw_tag)
        CommandList_struct *c = NULL;
        __u32 busaddr_masked, tag_masked;
 
-       tag_masked = cciss_tag_discard_error_bits(raw_tag);
+       tag_masked = cciss_tag_discard_error_bits(h, raw_tag);
        list_for_each_entry(c, &h->cmpQ, list) {
-               busaddr_masked = cciss_tag_discard_error_bits(c->busaddr);
+               busaddr_masked = cciss_tag_discard_error_bits(h, c->busaddr);
                if (busaddr_masked == tag_masked) {
                        finish_cmd(h, c, raw_tag);
                        return next_command(h);
@@ -3790,7 +3793,8 @@ static void __devinit cciss_wait_for_mode_change_ack(ctlr_info_t *h)
        }
 }
 
-static __devinit void cciss_enter_performant_mode(ctlr_info_t *h)
+static __devinit void cciss_enter_performant_mode(ctlr_info_t *h,
+       u32 use_short_tags)
 {
        /* This is a bit complicated.  There are 8 registers on
         * the controller which we write to to tell it 8 different
@@ -3845,7 +3849,7 @@ static __devinit void cciss_enter_performant_mode(ctlr_info_t *h)
        writel(0, &h->transtable->RepQCtrAddrHigh32);
        writel(h->reply_pool_dhandle, &h->transtable->RepQAddr0Low32);
        writel(0, &h->transtable->RepQAddr0High32);
-       writel(CFGTBL_Trans_Performant,
+       writel(CFGTBL_Trans_Performant | use_short_tags,
                        &(h->cfgtable->HostWrite.TransportRequest));
 
        writel(CFGTBL_ChangeReq, h->vaddr + SA5_DOORBELL);
@@ -3892,7 +3896,8 @@ static void __devinit cciss_put_controller_into_performant_mode(ctlr_info_t *h)
        if ((h->reply_pool == NULL) || (h->blockFetchTable == NULL))
                goto clean_up;
 
-       cciss_enter_performant_mode(h);
+       cciss_enter_performant_mode(h,
+               trans_support & CFGTBL_Trans_use_short_tags);
 
        /* Change the access methods to the performant access methods */
        h->access = SA5_performant_access;

diff --git a/drivers/block/cciss_cmd.h b/drivers/block/cciss_cmd.h
index 35463d2f0ee7ce71d80943105f1594eb556141d4..cd441bef031f1a4806ba29df8067c47b050bfae7 100644 (file)
--- a/drivers/block/cciss_cmd.h
+++ b/drivers/block/cciss_cmd.h
@@ -56,6 +56,7 @@
 
 #define CFGTBL_Trans_Simple     0x00000002l
 #define CFGTBL_Trans_Performant 0x00000004l
+#define CFGTBL_Trans_use_short_tags 0x20000000l
 
 #define CFGTBL_BusType_Ultra2   0x00000001l
 #define CFGTBL_BusType_Ultra3   0x00000002l