[PATCH v3 03/17] dmaengine: bcm-sba-raid: Common flags for sba_request state and fence
From: Anup Patel
Date: Tue Aug 22 2017 - 05:57:56 EST
This patch merges sba_request state and fence into common
sba_request flags. The sba_request flags not only saves
memory but it can also be extended in-future without adding
new members.
We also make each sba_request state as separate bit in
sba_request flags to help debugging situations where a
sba_request is accidently in two states.
Signed-off-by: Anup Patel <anup.patel@xxxxxxxxxxxx>
---
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