[PATCH 1/6] dma: bcm-sba-raid: Improve memory allocation in SBA RAID driver

From: Anup Patel
Date: Wed Jul 26 2017 - 01:37:43 EST

This patch improves memory allocation in SBA RAID driver in
following ways:
1. Simplify struct sba_request to reduce memory consumption
2. Allocate sba resources before registering dma device

Signed-off-by: Anup Patel <anup.patel@xxxxxxxxxxxx>
Reviewed-by: Scott Branden <scott.branden@xxxxxxxxxxxx>
Reviewed-by: Ray Jui <ray.jui@xxxxxxxxxxxx>
Reviewed-by: Vikram Prakash <vikram.prakash@xxxxxxxxxxxx>
---
drivers/dma/bcm-sba-raid.c | 439 +++++++++++++++++++++++----------------------
1 file changed, 226 insertions(+), 213 deletions(-)

diff --git a/drivers/dma/bcm-sba-raid.c b/drivers/dma/bcm-sba-raid.c
index e41bbc7..6d15fed 100644
--- a/drivers/dma/bcm-sba-raid.c
+++ b/drivers/dma/bcm-sba-raid.c
@@ -48,7 +48,8 @@

#include "dmaengine.h"

-/* SBA command related defines */
+/* ====== Driver macros and defines ===== */
+
#define SBA_TYPE_SHIFT 48
#define SBA_TYPE_MASK GENMASK(1, 0)
#define SBA_TYPE_A 0x0
@@ -82,39 +83,41 @@
#define SBA_CMD_WRITE_BUFFER 0xc
#define SBA_CMD_GALOIS 0xe

-/* Driver helper macros */
+#define SBA_MAX_REQ_PER_MBOX_CHANNEL 8192
+
#define to_sba_request(tx) \
container_of(tx, struct sba_request, tx)
#define to_sba_device(dchan) \
container_of(dchan, struct sba_device, dma_chan)

-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,
+/* ===== Driver data structures ===== */
+
+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;
- unsigned int next_count;
atomic_t next_pending_count;
/* BRCM message data */
- void *resp;
- dma_addr_t resp_dma;
- struct brcm_sba_command *cmds;
struct brcm_message msg;
struct dma_async_tx_descriptor tx;
+ /* SBA commands */
+ struct brcm_sba_command cmds[0];
};

enum sba_version {
@@ -128,11 +131,11 @@ struct sba_device {
/* DT configuration parameters */
enum sba_version ver;
/* Derived configuration parameters */
- u32 max_req;
u32 hw_buf_size;
u32 hw_resp_size;
u32 max_pq_coefs;
u32 max_pq_srcs;
+ u32 max_req;
u32 max_cmd_per_req;
u32 max_xor_srcs;
u32 max_resp_pool_size;
@@ -152,7 +155,6 @@ struct sba_device {
void *cmds_base;
dma_addr_t cmds_dma_base;
spinlock_t reqs_lock;
- struct sba_request *reqs;
bool reqs_fence;
struct list_head reqs_alloc_list;
struct list_head reqs_pending_list;
@@ -161,10 +163,9 @@ struct sba_device {
struct list_head reqs_completed_list;
struct list_head reqs_aborted_list;
struct list_head reqs_free_list;
- int reqs_free_count;
};

-/* ====== SBA command helper routines ===== */
+/* ====== Command helper routines ===== */

static inline u64 __pure sba_cmd_enc(u64 cmd, u32 val, u32 shift, u32 mask)
{
@@ -196,7 +197,7 @@ static inline u32 __pure sba_cmd_pq_c_mdata(u32 d, u32 b1, u32 b0)
((d & SBA_C_MDATA_DNUM_MASK) << SBA_C_MDATA_DNUM_SHIFT);
}

-/* ====== Channel resource management routines ===== */
+/* ====== General helper routines ===== */

static struct sba_request *sba_alloc_request(struct sba_device *sba)
{
@@ -204,24 +205,20 @@ static struct sba_request *sba_alloc_request(struct sba_device *sba)
struct sba_request *req = NULL;

spin_lock_irqsave(&sba->reqs_lock, flags);
-
req = list_first_entry_or_null(&sba->reqs_free_list,
struct sba_request, node);
- if (req) {
+ if (req)
list_move_tail(&req->node, &sba->reqs_alloc_list);
- req->state = SBA_REQUEST_STATE_ALLOCED;
- req->fence = false;
- req->first = req;
- INIT_LIST_HEAD(&req->next);
- req->next_count = 1;
- atomic_set(&req->next_pending_count, 1);
-
- sba->reqs_free_count--;
+ spin_unlock_irqrestore(&sba->reqs_lock, flags);
+ if (!req)
+ return NULL;

- dma_async_tx_descriptor_init(&req->tx, &sba->dma_chan);
- }
+ req->flags = SBA_REQUEST_STATE_ALLOCED;
+ req->first = req;
+ INIT_LIST_HEAD(&req->next);
+ atomic_set(&req->next_pending_count, 1);

- spin_unlock_irqrestore(&sba->reqs_lock, flags);
+ dma_async_tx_descriptor_init(&req->tx, &sba->dma_chan);

return req;
}
@@ -231,7 +228,8 @@ 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;
@@ -246,9 +244,10 @@ 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;
}
@@ -258,7 +257,8 @@ 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;
@@ -269,42 +269,34 @@ 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;
- sba->reqs_free_count++;
}

-static void sba_received_request(struct sba_request *req)
+/* Note: Must be called with sba->reqs_lock held */
+static void _sba_complete_request(struct sba_device *sba,
+ struct sba_request *req)
{
- unsigned long flags;
- struct sba_device *sba = req->sba;
-
- spin_lock_irqsave(&sba->reqs_lock, flags);
- req->state = SBA_REQUEST_STATE_RECEIVED;
- list_move_tail(&req->node, &sba->reqs_received_list);
- spin_unlock_irqrestore(&sba->reqs_lock, flags);
+ lockdep_assert_held(&sba->reqs_lock);
+ req->flags &= ~SBA_REQUEST_STATE_MASK;
+ req->flags |= SBA_REQUEST_STATE_COMPLETED;
+ list_move_tail(&req->node, &sba->reqs_completed_list);
+ if (list_empty(&sba->reqs_active_list))
+ sba->reqs_fence = false;
}

-static void sba_complete_chained_requests(struct sba_request *req)
+/* Note: Must be called with sba->reqs_lock held */
+static void _sba_received_request(struct sba_device *sba,
+ struct sba_request *req)
{
- unsigned long flags;
- struct sba_request *nreq;
- struct sba_device *sba = req->sba;
-
- spin_lock_irqsave(&sba->reqs_lock, flags);
-
- req->state = 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;
- list_move_tail(&nreq->node, &sba->reqs_completed_list);
- }
+ lockdep_assert_held(&sba->reqs_lock);
+ req->flags = SBA_REQUEST_STATE_RECEIVED;
+ list_move_tail(&req->node, &sba->reqs_received_list);
if (list_empty(&sba->reqs_active_list))
sba->reqs_fence = false;
-
- spin_unlock_irqrestore(&sba->reqs_lock, flags);
}

static void sba_free_chained_requests(struct sba_request *req)
@@ -332,8 +324,7 @@ static void sba_chain_request(struct sba_request *first,

list_add_tail(&req->next, &first->next);
req->first = first;
- first->next_count++;
- atomic_set(&first->next_pending_count, first->next_count);
+ atomic_inc(&first->next_pending_count);

spin_unlock_irqrestore(&sba->reqs_lock, flags);
}
@@ -383,26 +374,6 @@ static void sba_cleanup_pending_requests(struct sba_device *sba)
spin_unlock_irqrestore(&sba->reqs_lock, flags);
}

-/* ====== DMAENGINE callbacks ===== */
-
-static void sba_free_chan_resources(struct dma_chan *dchan)
-{
- /*
- * Channel resources are pre-alloced so we just free-up
- * whatever we can so that we can re-use pre-alloced
- * channel resources next time.
- */
- sba_cleanup_nonpending_requests(to_sba_device(dchan));
-}
-
-static int sba_device_terminate_all(struct dma_chan *dchan)
-{
- /* Cleanup all pending requests */
- sba_cleanup_pending_requests(to_sba_device(dchan));
-
- return 0;
-}
-
static int sba_send_mbox_request(struct sba_device *sba,
struct sba_request *req)
{
@@ -428,17 +399,27 @@ static int sba_send_mbox_request(struct sba_device *sba,
return 0;
}

-static void sba_issue_pending(struct dma_chan *dchan)
+static void sba_process_deferred_requests(struct sba_device *sba)
{
int ret;
+ u32 count;
unsigned long flags;
- struct sba_request *req, *req1;
- struct sba_device *sba = to_sba_device(dchan);
+ struct sba_request *req;
+ struct dma_async_tx_descriptor *tx;

spin_lock_irqsave(&sba->reqs_lock, flags);

- /* Process all pending request */
- list_for_each_entry_safe(req, req1, &sba->reqs_pending_list, node) {
+ /* Count pending requests */
+ count = 0;
+ list_for_each_entry(req, &sba->reqs_pending_list, node)
+ count++;
+
+ /* Process pending requests */
+ while (!list_empty(&sba->reqs_pending_list) && count) {
+ /* Get the first pending request */
+ req = list_first_entry(&sba->reqs_pending_list,
+ struct sba_request, node);
+
/* Try to make request active */
if (!_sba_active_request(sba, req))
break;
@@ -453,11 +434,102 @@ static void sba_issue_pending(struct dma_chan *dchan)
_sba_pending_request(sba, req);
break;
}
+
+ count--;
}

+ /* Count completed requests */
+ count = 0;
+ list_for_each_entry(req, &sba->reqs_completed_list, node)
+ count++;
+
+ /* Process completed requests */
+ while (!list_empty(&sba->reqs_completed_list) && count) {
+ req = list_first_entry(&sba->reqs_completed_list,
+ struct sba_request, node);
+ list_del_init(&req->node);
+ tx = &req->tx;
+
+ spin_unlock_irqrestore(&sba->reqs_lock, flags);
+
+ WARN_ON(tx->cookie < 0);
+ if (tx->cookie > 0) {
+ dma_cookie_complete(tx);
+ dmaengine_desc_get_callback_invoke(tx, NULL);
+ dma_descriptor_unmap(tx);
+ tx->callback = NULL;
+ tx->callback_result = NULL;
+ }
+
+ dma_run_dependencies(tx);
+
+ spin_lock_irqsave(&sba->reqs_lock, flags);
+
+ /* If waiting for 'ack' then move to completed list */
+ if (!async_tx_test_ack(&req->tx))
+ _sba_complete_request(sba, req);
+ else
+ _sba_free_request(sba, req);
+
+ count--;
+ }
+
+ /* Re-check pending and completed work */
+ count = 0;
+ if (!list_empty(&sba->reqs_pending_list) ||
+ !list_empty(&sba->reqs_completed_list))
+ count = 1;
+
spin_unlock_irqrestore(&sba->reqs_lock, flags);
}

+static void sba_process_received_request(struct sba_device *sba,
+ struct sba_request *req)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&sba->reqs_lock, flags);
+
+ /* Mark request as received */
+ _sba_received_request(sba, req);
+
+ /* Update request */
+ if (!atomic_dec_return(&req->first->next_pending_count))
+ _sba_complete_request(sba, req->first);
+ if (req->first != req)
+ _sba_free_request(sba, req);
+
+ spin_unlock_irqrestore(&sba->reqs_lock, flags);
+}
+
+/* ====== DMAENGINE callbacks ===== */
+
+static void sba_free_chan_resources(struct dma_chan *dchan)
+{
+ /*
+ * Channel resources are pre-alloced so we just free-up
+ * whatever we can so that we can re-use pre-alloced
+ * channel resources next time.
+ */
+ sba_cleanup_nonpending_requests(to_sba_device(dchan));
+}
+
+static int sba_device_terminate_all(struct dma_chan *dchan)
+{
+ /* Cleanup all pending requests */
+ sba_cleanup_pending_requests(to_sba_device(dchan));
+
+ return 0;
+}
+
+static void sba_issue_pending(struct dma_chan *dchan)
+{
+ struct sba_device *sba = to_sba_device(dchan);
+
+ /* Process deferred requests */
+ sba_process_deferred_requests(sba);
+}
+
static dma_cookie_t sba_tx_submit(struct dma_async_tx_descriptor *tx)
{
unsigned long flags;
@@ -506,6 +578,7 @@ static void sba_fillup_interrupt_msg(struct sba_request *req,
{
u64 cmd;
u32 c_mdata;
+ dma_addr_t resp_dma = req->tx.phys;
struct brcm_sba_command *cmdsp = cmds;

/* Type-B command to load dummy data into buf0 */
@@ -521,7 +594,7 @@ static void sba_fillup_interrupt_msg(struct sba_request *req,
cmdsp->cmd = cmd;
*cmdsp->cmd_dma = cpu_to_le64(cmd);
cmdsp->flags = BRCM_SBA_CMD_TYPE_B;
- cmdsp->data = req->resp_dma;
+ cmdsp->data = resp_dma;
cmdsp->data_len = req->sba->hw_resp_size;
cmdsp++;

@@ -542,11 +615,11 @@ static void sba_fillup_interrupt_msg(struct sba_request *req,
cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
if (req->sba->hw_resp_size) {
cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP;
- cmdsp->resp = req->resp_dma;
+ cmdsp->resp = resp_dma;
cmdsp->resp_len = req->sba->hw_resp_size;
}
cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT;
- cmdsp->data = req->resp_dma;
+ cmdsp->data = resp_dma;
cmdsp->data_len = req->sba->hw_resp_size;
cmdsp++;

@@ -573,7 +646,7 @@ 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);
@@ -593,6 +666,7 @@ static void sba_fillup_memcpy_msg(struct sba_request *req,
{
u64 cmd;
u32 c_mdata;
+ dma_addr_t resp_dma = req->tx.phys;
struct brcm_sba_command *cmdsp = cmds;

/* Type-B command to load data into buf0 */
@@ -629,7 +703,7 @@ static void sba_fillup_memcpy_msg(struct sba_request *req,
cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
if (req->sba->hw_resp_size) {
cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP;
- cmdsp->resp = req->resp_dma;
+ cmdsp->resp = resp_dma;
cmdsp->resp_len = req->sba->hw_resp_size;
}
cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT;
@@ -656,7 +730,8 @@ 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,
@@ -711,6 +786,7 @@ static void sba_fillup_xor_msg(struct sba_request *req,
u64 cmd;
u32 c_mdata;
unsigned int i;
+ dma_addr_t resp_dma = req->tx.phys;
struct brcm_sba_command *cmdsp = cmds;

/* Type-B command to load data into buf0 */
@@ -766,7 +842,7 @@ static void sba_fillup_xor_msg(struct sba_request *req,
cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
if (req->sba->hw_resp_size) {
cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP;
- cmdsp->resp = req->resp_dma;
+ cmdsp->resp = resp_dma;
cmdsp->resp_len = req->sba->hw_resp_size;
}
cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT;
@@ -793,7 +869,8 @@ 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,
@@ -854,6 +931,7 @@ static void sba_fillup_pq_msg(struct sba_request *req,
u64 cmd;
u32 c_mdata;
unsigned int i;
+ dma_addr_t resp_dma = req->tx.phys;
struct brcm_sba_command *cmdsp = cmds;

if (pq_continue) {
@@ -947,7 +1025,7 @@ static void sba_fillup_pq_msg(struct sba_request *req,
cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
if (req->sba->hw_resp_size) {
cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP;
- cmdsp->resp = req->resp_dma;
+ cmdsp->resp = resp_dma;
cmdsp->resp_len = req->sba->hw_resp_size;
}
cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT;
@@ -974,7 +1052,7 @@ static void sba_fillup_pq_msg(struct sba_request *req,
cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
if (req->sba->hw_resp_size) {
cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP;
- cmdsp->resp = req->resp_dma;
+ cmdsp->resp = resp_dma;
cmdsp->resp_len = req->sba->hw_resp_size;
}
cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT;
@@ -1002,7 +1080,8 @@ 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),
@@ -1027,6 +1106,7 @@ static void sba_fillup_pq_single_msg(struct sba_request *req,
u64 cmd;
u32 c_mdata;
u8 pos, dpos = raid6_gflog[scf];
+ dma_addr_t resp_dma = req->tx.phys;
struct brcm_sba_command *cmdsp = cmds;

if (!dst_p)
@@ -1105,7 +1185,7 @@ static void sba_fillup_pq_single_msg(struct sba_request *req,
cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
if (req->sba->hw_resp_size) {
cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP;
- cmdsp->resp = req->resp_dma;
+ cmdsp->resp = resp_dma;
cmdsp->resp_len = req->sba->hw_resp_size;
}
cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT;
@@ -1226,7 +1306,7 @@ static void sba_fillup_pq_single_msg(struct sba_request *req,
cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
if (req->sba->hw_resp_size) {
cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP;
- cmdsp->resp = req->resp_dma;
+ cmdsp->resp = resp_dma;
cmdsp->resp_len = req->sba->hw_resp_size;
}
cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT;
@@ -1255,7 +1335,8 @@ 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),
@@ -1370,40 +1451,10 @@ sba_prep_dma_pq(struct dma_chan *dchan, dma_addr_t *dst, dma_addr_t *src,

/* ====== Mailbox callbacks ===== */

-static void sba_dma_tx_actions(struct sba_request *req)
-{
- struct dma_async_tx_descriptor *tx = &req->tx;
-
- WARN_ON(tx->cookie < 0);
-
- if (tx->cookie > 0) {
- dma_cookie_complete(tx);
-
- /*
- * Call the callback (must not sleep or submit new
- * operations to this channel)
- */
- if (tx->callback)
- tx->callback(tx->callback_param);
-
- dma_descriptor_unmap(tx);
- }
-
- /* Run dependent operations */
- dma_run_dependencies(tx);
-
- /* If waiting for 'ack' then move to completed list */
- if (!async_tx_test_ack(&req->tx))
- sba_complete_chained_requests(req);
- else
- sba_free_chained_requests(req);
-}
-
static void sba_receive_message(struct mbox_client *cl, void *msg)
{
- unsigned long flags;
struct brcm_message *m = msg;
- struct sba_request *req = m->ctx, *req1;
+ struct sba_request *req = m->ctx;
struct sba_device *sba = req->sba;

/* Error count if message has error */
@@ -1411,36 +1462,11 @@ static void sba_receive_message(struct mbox_client *cl, void *msg)
dev_err(sba->dev, "%s got message with error %d",
dma_chan_name(&sba->dma_chan), m->error);

- /* Mark request as received */
- sba_received_request(req);
-
- /* Wait for all chained requests to be completed */
- if (atomic_dec_return(&req->first->next_pending_count))
- goto done;
-
- /* Point to first request */
- req = req->first;
-
- /* Update request */
- if (req->state == SBA_REQUEST_STATE_RECEIVED)
- sba_dma_tx_actions(req);
- else
- sba_free_chained_requests(req);
-
- spin_lock_irqsave(&sba->reqs_lock, flags);
-
- /* Re-check all completed request waiting for 'ack' */
- list_for_each_entry_safe(req, req1, &sba->reqs_completed_list, node) {
- spin_unlock_irqrestore(&sba->reqs_lock, flags);
- sba_dma_tx_actions(req);
- spin_lock_irqsave(&sba->reqs_lock, flags);
- }
-
- spin_unlock_irqrestore(&sba->reqs_lock, flags);
+ /* Process received request */
+ sba_process_received_request(sba, req);

-done:
- /* Try to submit pending request */
- sba_issue_pending(&sba->dma_chan);
+ /* Process deferred requests */
+ sba_process_deferred_requests(sba);
}

/* ====== Platform driver routines ===== */
@@ -1450,13 +1476,13 @@ static int sba_prealloc_channel_resources(struct sba_device *sba)
int i, j, p, ret = 0;
struct sba_request *req = NULL;

- sba->resp_base = dma_alloc_coherent(sba->dma_dev.dev,
+ sba->resp_base = dma_alloc_coherent(sba->mbox_dev,
sba->max_resp_pool_size,
&sba->resp_dma_base, GFP_KERNEL);
if (!sba->resp_base)
return -ENOMEM;

- sba->cmds_base = dma_alloc_coherent(sba->dma_dev.dev,
+ sba->cmds_base = dma_alloc_coherent(sba->mbox_dev,
sba->max_cmds_pool_size,
&sba->cmds_dma_base, GFP_KERNEL);
if (!sba->cmds_base) {
@@ -1474,31 +1500,21 @@ static int sba_prealloc_channel_resources(struct sba_device *sba)
INIT_LIST_HEAD(&sba->reqs_aborted_list);
INIT_LIST_HEAD(&sba->reqs_free_list);

- sba->reqs = devm_kcalloc(sba->dev, sba->max_req,
- sizeof(*req), GFP_KERNEL);
- if (!sba->reqs) {
- ret = -ENOMEM;
- goto fail_free_cmds_pool;
- }
-
for (i = 0, p = 0; i < sba->max_req; i++) {
- req = &sba->reqs[i];
+ req = devm_kzalloc(sba->dev,
+ sizeof(*req) +
+ sba->max_cmd_per_req * sizeof(req->cmds[0]),
+ GFP_KERNEL);
+ if (!req) {
+ ret = -ENOMEM;
+ goto fail_free_cmds_pool;
+ }
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;
- req->cmds = devm_kcalloc(sba->dev, sba->max_cmd_per_req,
- sizeof(*req->cmds), GFP_KERNEL);
- if (!req->cmds) {
- ret = -ENOMEM;
- goto fail_free_cmds_pool;
- }
for (j = 0; j < sba->max_cmd_per_req; j++) {
req->cmds[j].cmd = 0;
req->cmds[j].cmd_dma = sba->cmds_base +
@@ -1510,20 +1526,18 @@ static int sba_prealloc_channel_resources(struct sba_device *sba)
memset(&req->msg, 0, sizeof(req->msg));
dma_async_tx_descriptor_init(&req->tx, &sba->dma_chan);
req->tx.tx_submit = sba_tx_submit;
- req->tx.phys = req->resp_dma;
+ req->tx.phys = sba->resp_dma_base + i * sba->hw_resp_size;
list_add_tail(&req->node, &sba->reqs_free_list);
}

- sba->reqs_free_count = sba->max_req;
-
return 0;

fail_free_cmds_pool:
- dma_free_coherent(sba->dma_dev.dev,
+ dma_free_coherent(sba->mbox_dev,
sba->max_cmds_pool_size,
sba->cmds_base, sba->cmds_dma_base);
fail_free_resp_pool:
- dma_free_coherent(sba->dma_dev.dev,
+ dma_free_coherent(sba->mbox_dev,
sba->max_resp_pool_size,
sba->resp_base, sba->resp_dma_base);
return ret;
@@ -1532,9 +1546,9 @@ static int sba_prealloc_channel_resources(struct sba_device *sba)
static void sba_freeup_channel_resources(struct sba_device *sba)
{
dmaengine_terminate_all(&sba->dma_chan);
- dma_free_coherent(sba->dma_dev.dev, sba->max_cmds_pool_size,
+ dma_free_coherent(sba->mbox_dev, sba->max_cmds_pool_size,
sba->cmds_base, sba->cmds_dma_base);
- dma_free_coherent(sba->dma_dev.dev, sba->max_resp_pool_size,
+ dma_free_coherent(sba->mbox_dev, sba->max_resp_pool_size,
sba->resp_base, sba->resp_dma_base);
sba->resp_base = NULL;
sba->resp_dma_base = 0;
@@ -1625,6 +1639,13 @@ static int sba_probe(struct platform_device *pdev)
sba->dev = &pdev->dev;
platform_set_drvdata(pdev, sba);

+ /* Number of channels equals number of mailbox channels */
+ ret = of_count_phandle_with_args(pdev->dev.of_node,
+ "mboxes", "#mbox-cells");
+ if (ret <= 0)
+ return -ENODEV;
+ mchans_count = ret;
+
/* Determine SBA version from DT compatible string */
if (of_device_is_compatible(sba->dev->of_node, "brcm,iproc-sba"))
sba->ver = SBA_VER_1;
@@ -1637,14 +1658,12 @@ static int sba_probe(struct platform_device *pdev)
/* Derived Configuration parameters */
switch (sba->ver) {
case SBA_VER_1:
- sba->max_req = 1024;
sba->hw_buf_size = 4096;
sba->hw_resp_size = 8;
sba->max_pq_coefs = 6;
sba->max_pq_srcs = 6;
break;
case SBA_VER_2:
- sba->max_req = 1024;
sba->hw_buf_size = 4096;
sba->hw_resp_size = 8;
sba->max_pq_coefs = 30;
@@ -1658,6 +1677,7 @@ static int sba_probe(struct platform_device *pdev)
default:
return -EINVAL;
}
+ sba->max_req = SBA_MAX_REQ_PER_MBOX_CHANNEL * mchans_count;
sba->max_cmd_per_req = sba->max_pq_srcs + 3;
sba->max_xor_srcs = sba->max_cmd_per_req - 1;
sba->max_resp_pool_size = sba->max_req * sba->hw_resp_size;
@@ -1671,22 +1691,14 @@ static int sba_probe(struct platform_device *pdev)
sba->client.knows_txdone = false;
sba->client.tx_tout = 0;

- /* Number of channels equals number of mailbox channels */
- ret = of_count_phandle_with_args(pdev->dev.of_node,
- "mboxes", "#mbox-cells");
- if (ret <= 0)
- return -ENODEV;
- mchans_count = ret;
- sba->mchans_count = 0;
- atomic_set(&sba->mchans_current, 0);
-
/* Allocate mailbox channel array */
- sba->mchans = devm_kcalloc(&pdev->dev, sba->mchans_count,
+ sba->mchans = devm_kcalloc(&pdev->dev, mchans_count,
sizeof(*sba->mchans), GFP_KERNEL);
if (!sba->mchans)
return -ENOMEM;

/* Request mailbox channels */
+ sba->mchans_count = 0;
for (i = 0; i < mchans_count; i++) {
sba->mchans[i] = mbox_request_channel(&sba->client, i);
if (IS_ERR(sba->mchans[i])) {
@@ -1695,6 +1707,7 @@ static int sba_probe(struct platform_device *pdev)
}
sba->mchans_count++;
}
+ atomic_set(&sba->mchans_current, 0);

/* Find-out underlying mailbox device */
ret = of_parse_phandle_with_args(pdev->dev.of_node,
@@ -1723,15 +1736,15 @@ static int sba_probe(struct platform_device *pdev)
}
}

- /* Register DMA device with linux async framework */
- ret = sba_async_register(sba);
+ /* Prealloc channel resource */
+ ret = sba_prealloc_channel_resources(sba);
if (ret)
goto fail_free_mchans;

- /* Prealloc channel resource */
- ret = sba_prealloc_channel_resources(sba);
+ /* Register DMA device with linux async framework */
+ ret = sba_async_register(sba);
if (ret)
- goto fail_async_dev_unreg;
+ goto fail_free_resources;

/* Print device info */
dev_info(sba->dev, "%s using SBAv%d and %d mailbox channels",
@@ -1740,8 +1753,8 @@ static int sba_probe(struct platform_device *pdev)

return 0;

-fail_async_dev_unreg:
- dma_async_device_unregister(&sba->dma_dev);
+fail_free_resources:
+ sba_freeup_channel_resources(sba);
fail_free_mchans:
for (i = 0; i < sba->mchans_count; i++)
mbox_free_channel(sba->mchans[i]);
@@ -1753,10 +1766,10 @@ static int sba_remove(struct platform_device *pdev)
int i;
struct sba_device *sba = platform_get_drvdata(pdev);

- sba_freeup_channel_resources(sba);
-
dma_async_device_unregister(&sba->dma_dev);

+ sba_freeup_channel_resources(sba);
+
for (i = 0; i < sba->mchans_count; i++)
mbox_free_channel(sba->mchans[i]);

--
2.7.4