On Wed, Jun 10, 2015 at 06:42:26PM -0700, rajinikanth.panduran...@pmcs.com
wrote:
> From: Rajinikanth Pandurangan <rajinikanth.panduran...@pmcs.com>
>
> Description:
> If writeq() not supported, then do atomic two 32bit write
>
> Signed-off-by: Rajinikanth Pandurangan <rajinikanth.panduran...@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 e0a76d5..e4ff47e 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;
> }
Why not make src_writeq() a wrapper over either writeq() or
spin_lock_irqsave(); src_writel() x2; spin_unlock_irqrestore(), depending on
the presence of writeq?
>
> --
> 1.9.3
>
> --
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--
Johannes Thumshirn Storage
jthumsh...@suse.de +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
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