[PATCH V5 04/11] [SCSI] aacraid: Enable 64-bit write to controller register

rajinikanth.pandurangan
2015-07-22T16:49:48Z

From: Rajinikanth Pandurangan <rajinikanth.pandurangan@pmcs.com>

Description:
If writeq() not supported, then do atomic two 32bit write

Changes from V2:
None

Reviewed by:
Tomas Henzl <thenzl@redhat.com>,
Mahesh Rajashekhara <Mahesh.Rajashekhara@pmcs.com>,
Johannes Thumshirn <jthumshirn@suse.de>

Signed-off-by: Rajinikanth Pandurangan <rajinikanth.pandurangan@pmcs.com>
---
drivers/scsi/aacraid/aacraid.h | 9 +++++++++
drivers/scsi/aacraid/comminit.c | 1 +
drivers/scsi/aacraid/src.c | 12 ++++++++++--
3 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/aacraid/aacraid.h b/drivers/scsi/aacraid/aacraid.h
index 62b0999..e54f597 100644
--- a/drivers/scsi/aacraid/aacraid.h
+++ b/drivers/scsi/aacraid/aacraid.h
@@ -844,6 +844,10 @@ struct src_registers {
&((AEP)->regs.src.bar0->CSR))
#define src_writel(AEP, CSR, value) writel(value, \
&((AEP)->regs.src.bar0->CSR))
+#if defined(writeq)
+#define src_writeq(AEP, CSR, value) writeq(value, \
+ &((AEP)->regs.src.bar0->CSR))
+#endif

#define SRC_ODR_SHIFT 12
#define SRC_IDR_SHIFT 9
@@ -1163,6 +1167,11 @@ struct aac_dev
struct fsa_dev_info *fsa_dev;
struct task_struct *thread;
int cardtype;
+ /*
+ *This lock will protect the two 32-bit
+ *writes to the Inbound Queue
+ */
+ spinlock_t iq_lock;

/*
* The following is the device specific extension.
diff --git a/drivers/scsi/aacraid/comminit.c b/drivers/scsi/aacraid/comminit.c
index 45a0a04..b4b6088 100644
--- a/drivers/scsi/aacraid/comminit.c
+++ b/drivers/scsi/aacraid/comminit.c
@@ -424,6 +424,7 @@ struct aac_dev *aac_init_adapter(struct aac_dev *dev)
dev->management_fib_count = 0;
spin_lock_init(&dev->manage_lock);
spin_lock_init(&dev->sync_lock);
+ spin_lock_init(&dev->iq_lock);
dev->max_fib_size = sizeof(struct hw_fib);
dev->sg_tablesize = host->sg_tablesize = (dev->max_fib_size
- sizeof(struct aac_fibhdr)
diff --git a/drivers/scsi/aacraid/src.c b/drivers/scsi/aacraid/src.c
index eb07b3d..1409a0b 100644
--- a/drivers/scsi/aacraid/src.c
+++ b/drivers/scsi/aacraid/src.c
@@ -447,6 +447,10 @@ static int aac_src_deliver_message(struct fib *fib)
u32 fibsize;
dma_addr_t address;
struct aac_fib_xporthdr *pFibX;
+#if !defined(writeq)
+ unsigned long flags;
+#endif
+
u16 hdr_size = le16_to_cpu(fib->hw_fib_va->header.Size);

atomic_inc(&q->numpending);
@@ -511,10 +515,14 @@ static int aac_src_deliver_message(struct fib *fib)
return -EINVAL;
address |= fibsize;
}
-
+#if defined(writeq)
+ src_writeq(dev, MUnit.IQ_L, (u64)address);
+#else
+ spin_lock_irqsave(&fib->dev->iq_lock, flags);
src_writel(dev, MUnit.IQ_H, upper_32_bits(address) & 0xffffffff);
src_writel(dev, MUnit.IQ_L, address & 0xffffffff);
-
+ spin_unlock_irqrestore(&fib->dev->iq_lock, flags);
+#endif
return 0;
}

--
1.9.3