Subject: [PATCH v2 03/16] dmaengine: bcm-sba-raid: Common flags for sba_request state and fence

From: [email-masked] (Vinod Koul)
Date: Thu, 17 Aug 2017 09:15:34 +0530

On Tue, Aug 01, 2017 at 04:07:47PM +0530, Anup Patel wrote:
> This patch merges sba_request state and fence into common
> sba_request flags. Also, in-future we can extend sba_request
> flags as required.

and it also changes the flag values to bits, which I have no idea why that
was done, care to explain that please...

> 
> Signed-off-by: Anup Patel <[email-masked]>
> ---
>  drivers/dma/bcm-sba-raid.c | 66 ++++++++++++++++++++++++++--------------------
>  1 file changed, 38 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/dma/bcm-sba-raid.c b/drivers/dma/bcm-sba-raid.c
> index f81d5ac..6fa3df1 100644
> --- a/drivers/dma/bcm-sba-raid.c
> +++ b/drivers/dma/bcm-sba-raid.c
> @@ -91,22 +91,23 @@
>  
>  /* ===== Driver data structures ===== */
>  
> -enum sba_request_state {
> -	SBA_REQUEST_STATE_FREE = 1,
> -	SBA_REQUEST_STATE_ALLOCED = 2,
> -	SBA_REQUEST_STATE_PENDING = 3,
> -	SBA_REQUEST_STATE_ACTIVE = 4,
> -	SBA_REQUEST_STATE_RECEIVED = 5,
> -	SBA_REQUEST_STATE_COMPLETED = 6,
> -	SBA_REQUEST_STATE_ABORTED = 7,
> +enum sba_request_flags {
> +	SBA_REQUEST_STATE_FREE		= 0x001,
> +	SBA_REQUEST_STATE_ALLOCED	= 0x002,
> +	SBA_REQUEST_STATE_PENDING	= 0x004,
> +	SBA_REQUEST_STATE_ACTIVE	= 0x008,
> +	SBA_REQUEST_STATE_RECEIVED	= 0x010,
> +	SBA_REQUEST_STATE_COMPLETED	= 0x020,
> +	SBA_REQUEST_STATE_ABORTED	= 0x040,
> +	SBA_REQUEST_STATE_MASK		= 0x0ff,
> +	SBA_REQUEST_FENCE		= 0x100,
>  };
>  
>  struct sba_request {
>  	/* Global state */
>  	struct list_head node;
>  	struct sba_device *sba;
> -	enum sba_request_state state;
> -	bool fence;
> +	u32 flags;
>  	/* Chained requests management */
>  	struct sba_request *first;
>  	struct list_head next;
> @@ -217,8 +218,7 @@ static struct sba_request *sba_alloc_request(struct sba_device *sba)
>  	if (!req)
>  		return NULL;
>  
> -	req->state = SBA_REQUEST_STATE_ALLOCED;
> -	req->fence = false;
> +	req->flags = SBA_REQUEST_STATE_ALLOCED;
>  	req->first = req;
>  	INIT_LIST_HEAD(&req->next);
>  	req->next_count = 1;
> @@ -234,7 +234,8 @@ static void _sba_pending_request(struct sba_device *sba,
>  				 struct sba_request *req)
>  {
>  	lockdep_assert_held(&sba->reqs_lock);
> -	req->state = SBA_REQUEST_STATE_PENDING;
> +	req->flags &= ~SBA_REQUEST_STATE_MASK;
> +	req->flags |= SBA_REQUEST_STATE_PENDING;
>  	list_move_tail(&req->node, &sba->reqs_pending_list);
>  	if (list_empty(&sba->reqs_active_list))
>  		sba->reqs_fence = false;
> @@ -249,9 +250,10 @@ static bool _sba_active_request(struct sba_device *sba,
>  		sba->reqs_fence = false;
>  	if (sba->reqs_fence)
>  		return false;
> -	req->state = SBA_REQUEST_STATE_ACTIVE;
> +	req->flags &= ~SBA_REQUEST_STATE_MASK;
> +	req->flags |= SBA_REQUEST_STATE_ACTIVE;
>  	list_move_tail(&req->node, &sba->reqs_active_list);
> -	if (req->fence)
> +	if (req->flags & SBA_REQUEST_FENCE)
>  		sba->reqs_fence = true;
>  	return true;
>  }
> @@ -261,7 +263,8 @@ static void _sba_abort_request(struct sba_device *sba,
>  			       struct sba_request *req)
>  {
>  	lockdep_assert_held(&sba->reqs_lock);
> -	req->state = SBA_REQUEST_STATE_ABORTED;
> +	req->flags &= ~SBA_REQUEST_STATE_MASK;
> +	req->flags |= SBA_REQUEST_STATE_ABORTED;
>  	list_move_tail(&req->node, &sba->reqs_aborted_list);
>  	if (list_empty(&sba->reqs_active_list))
>  		sba->reqs_fence = false;
> @@ -272,7 +275,8 @@ static void _sba_free_request(struct sba_device *sba,
>  			      struct sba_request *req)
>  {
>  	lockdep_assert_held(&sba->reqs_lock);
> -	req->state = SBA_REQUEST_STATE_FREE;
> +	req->flags &= ~SBA_REQUEST_STATE_MASK;
> +	req->flags |= SBA_REQUEST_STATE_FREE;
>  	list_move_tail(&req->node, &sba->reqs_free_list);
>  	if (list_empty(&sba->reqs_active_list))
>  		sba->reqs_fence = false;
> @@ -285,7 +289,8 @@ static void sba_received_request(struct sba_request *req)
>  	struct sba_device *sba = req->sba;
>  
>  	spin_lock_irqsave(&sba->reqs_lock, flags);
> -	req->state = SBA_REQUEST_STATE_RECEIVED;
> +	req->flags &= ~SBA_REQUEST_STATE_MASK;
> +	req->flags |= SBA_REQUEST_STATE_RECEIVED;
>  	list_move_tail(&req->node, &sba->reqs_received_list);
>  	spin_unlock_irqrestore(&sba->reqs_lock, flags);
>  }
> @@ -298,10 +303,12 @@ static void sba_complete_chained_requests(struct sba_request *req)
>  
>  	spin_lock_irqsave(&sba->reqs_lock, flags);
>  
> -	req->state = SBA_REQUEST_STATE_COMPLETED;
> +	req->flags &= ~SBA_REQUEST_STATE_MASK;
> +	req->flags |= SBA_REQUEST_STATE_COMPLETED;
>  	list_move_tail(&req->node, &sba->reqs_completed_list);
>  	list_for_each_entry(nreq, &req->next, next) {
> -		nreq->state = SBA_REQUEST_STATE_COMPLETED;
> +		nreq->flags &= ~SBA_REQUEST_STATE_MASK;
> +		nreq->flags |= SBA_REQUEST_STATE_COMPLETED;
>  		list_move_tail(&nreq->node, &sba->reqs_completed_list);
>  	}
>  	if (list_empty(&sba->reqs_active_list))
> @@ -576,7 +583,7 @@ sba_prep_dma_interrupt(struct dma_chan *dchan, unsigned long flags)
>  	 * Force fence so that no requests are submitted
>  	 * until DMA callback for this request is invoked.
>  	 */
> -	req->fence = true;
> +	req->flags |= SBA_REQUEST_FENCE;
>  
>  	/* Fillup request message */
>  	sba_fillup_interrupt_msg(req, req->cmds, &req->msg);
> @@ -659,7 +666,8 @@ sba_prep_dma_memcpy_req(struct sba_device *sba,
>  	req = sba_alloc_request(sba);
>  	if (!req)
>  		return NULL;
> -	req->fence = (flags & DMA_PREP_FENCE) ? true : false;
> +	if (flags & DMA_PREP_FENCE)
> +		req->flags |= SBA_REQUEST_FENCE;
>  
>  	/* Fillup request message */
>  	sba_fillup_memcpy_msg(req, req->cmds, &req->msg,
> @@ -796,7 +804,8 @@ sba_prep_dma_xor_req(struct sba_device *sba,
>  	req = sba_alloc_request(sba);
>  	if (!req)
>  		return NULL;
> -	req->fence = (flags & DMA_PREP_FENCE) ? true : false;
> +	if (flags & DMA_PREP_FENCE)
> +		req->flags |= SBA_REQUEST_FENCE;
>  
>  	/* Fillup request message */
>  	sba_fillup_xor_msg(req, req->cmds, &req->msg,
> @@ -1005,7 +1014,8 @@ sba_prep_dma_pq_req(struct sba_device *sba, dma_addr_t off,
>  	req = sba_alloc_request(sba);
>  	if (!req)
>  		return NULL;
> -	req->fence = (flags & DMA_PREP_FENCE) ? true : false;
> +	if (flags & DMA_PREP_FENCE)
> +		req->flags |= SBA_REQUEST_FENCE;
>  
>  	/* Fillup request messages */
>  	sba_fillup_pq_msg(req, dmaf_continue(flags),
> @@ -1258,7 +1268,8 @@ sba_prep_dma_pq_single_req(struct sba_device *sba, dma_addr_t off,
>  	req = sba_alloc_request(sba);
>  	if (!req)
>  		return NULL;
> -	req->fence = (flags & DMA_PREP_FENCE) ? true : false;
> +	if (flags & DMA_PREP_FENCE)
> +		req->flags |= SBA_REQUEST_FENCE;
>  
>  	/* Fillup request messages */
>  	sba_fillup_pq_single_msg(req,  dmaf_continue(flags),
> @@ -1425,7 +1436,7 @@ static void sba_receive_message(struct mbox_client *cl, void *msg)
>  	req = req->first;
>  
>  	/* Update request */
> -	if (req->state == SBA_REQUEST_STATE_RECEIVED)
> +	if (req->flags & SBA_REQUEST_STATE_RECEIVED)
>  		sba_dma_tx_actions(req);
>  	else
>  		sba_free_chained_requests(req);
> @@ -1488,11 +1499,10 @@ static int sba_prealloc_channel_resources(struct sba_device *sba)
>  		req = &sba->reqs[i];
>  		INIT_LIST_HEAD(&req->node);
>  		req->sba = sba;
> -		req->state = SBA_REQUEST_STATE_FREE;
> +		req->flags = SBA_REQUEST_STATE_FREE;
>  		INIT_LIST_HEAD(&req->next);
>  		req->next_count = 1;
>  		atomic_set(&req->next_pending_count, 0);
> -		req->fence = false;
>  		req->resp = sba->resp_base + p;
>  		req->resp_dma = sba->resp_dma_base + p;
>  		p += sba->hw_resp_size;
> -- 
> 2.7.4
> 

-- 
~Vinod