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Date: Wed, 13 Apr 2022 14:37:33 +0300
From: <i.m.novikov@...ro.com>
To: <sanju.mehta@....com>
CC: <i.m.novikov@...ro.com>, <vkoul@...nel.org>,
<dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux@...ro.com>
Subject: [PATCH] dmaengine: PTDMA: support polled mode
From: Ilya Novikov <i.m.novikov@...ro.com>
If the DMA_PREP_INTERRUPT flag is not provided, run in polled mode,
which significantly improves IOPS: more than twice on chunks < 4K.
Signed-off-by: Ilya Novikov <i.m.novikov@...ro.com>
---
drivers/dma/ptdma/ptdma-dev.c | 36 +++++++++++++++--------------
drivers/dma/ptdma/ptdma-dmaengine.c | 16 ++++++++++++-
drivers/dma/ptdma/ptdma.h | 13 +++++++++++
3 files changed, 47 insertions(+), 18 deletions(-)
diff --git a/drivers/dma/ptdma/ptdma-dev.c b/drivers/dma/ptdma/ptdma-dev.c
index daafea5bc35d..377da23012ac 100644
--- a/drivers/dma/ptdma/ptdma-dev.c
+++ b/drivers/dma/ptdma/ptdma-dev.c
@@ -100,6 +100,7 @@ int pt_core_perform_passthru(struct pt_cmd_queue *cmd_q,
struct pt_passthru_engine *pt_engine)
{
struct ptdma_desc desc;
+ struct pt_device *pt = container_of(cmd_q, struct pt_device, cmd_q);
cmd_q->cmd_error = 0;
cmd_q->total_pt_ops++;
@@ -111,17 +112,12 @@ int pt_core_perform_passthru(struct pt_cmd_queue *cmd_q,
desc.dst_lo = lower_32_bits(pt_engine->dst_dma);
desc.dw5.dst_hi = upper_32_bits(pt_engine->dst_dma);
- return pt_core_execute_cmd(&desc, cmd_q);
-}
-
-static inline void pt_core_disable_queue_interrupts(struct pt_device *pt)
-{
- iowrite32(0, pt->cmd_q.reg_control + 0x000C);
-}
+ if (cmd_q->int_en)
+ pt_core_enable_queue_interrupts(pt);
+ else
+ pt_core_disable_queue_interrupts(pt);
-static inline void pt_core_enable_queue_interrupts(struct pt_device *pt)
-{
- iowrite32(SUPPORTED_INTERRUPTS, pt->cmd_q.reg_control + 0x000C);
+ return pt_core_execute_cmd(&desc, cmd_q);
}
static void pt_do_cmd_complete(unsigned long data)
@@ -144,14 +140,10 @@ static void pt_do_cmd_complete(unsigned long data)
cmd->pt_cmd_callback(cmd->data, cmd->ret);
}
-static irqreturn_t pt_core_irq_handler(int irq, void *data)
+void pt_check_status_trans(struct pt_device *pt, struct pt_cmd_queue *cmd_q)
{
- struct pt_device *pt = data;
- struct pt_cmd_queue *cmd_q = &pt->cmd_q;
u32 status;
- pt_core_disable_queue_interrupts(pt);
- pt->total_interrupts++;
status = ioread32(cmd_q->reg_control + 0x0010);
if (status) {
cmd_q->int_status = status;
@@ -162,11 +154,21 @@ static irqreturn_t pt_core_irq_handler(int irq, void *data)
if ((status & INT_ERROR) && !cmd_q->cmd_error)
cmd_q->cmd_error = CMD_Q_ERROR(cmd_q->q_status);
- /* Acknowledge the interrupt */
+ /* Acknowledge the completion */
iowrite32(status, cmd_q->reg_control + 0x0010);
- pt_core_enable_queue_interrupts(pt);
pt_do_cmd_complete((ulong)&pt->tdata);
}
+}
+
+static irqreturn_t pt_core_irq_handler(int irq, void *data)
+{
+ struct pt_device *pt = data;
+ struct pt_cmd_queue *cmd_q = &pt->cmd_q;
+
+ pt_core_disable_queue_interrupts(pt);
+ pt->total_interrupts++;
+ pt_check_status_trans(pt, cmd_q);
+ pt_core_enable_queue_interrupts(pt);
return IRQ_HANDLED;
}
diff --git a/drivers/dma/ptdma/ptdma-dmaengine.c b/drivers/dma/ptdma/ptdma-dmaengine.c
index 91b93e8d9779..ea07cc42f4d0 100644
--- a/drivers/dma/ptdma/ptdma-dmaengine.c
+++ b/drivers/dma/ptdma/ptdma-dmaengine.c
@@ -171,6 +171,7 @@ static struct pt_dma_desc *pt_alloc_dma_desc(struct pt_dma_chan *chan,
vchan_tx_prep(&chan->vc, &desc->vd, flags);
desc->pt = chan->pt;
+ desc->pt->cmd_q.int_en = !!(flags & DMA_PREP_INTERRUPT);
desc->issued_to_hw = 0;
desc->status = DMA_IN_PROGRESS;
@@ -257,6 +258,17 @@ static void pt_issue_pending(struct dma_chan *dma_chan)
pt_cmd_callback(desc, 0);
}
+enum dma_status
+pt_tx_status(struct dma_chan *c, dma_cookie_t cookie,
+ struct dma_tx_state *txstate)
+{
+ struct pt_device *pt = to_pt_chan(c)->pt;
+ struct pt_cmd_queue *cmd_q = &pt->cmd_q;
+
+ pt_check_status_trans(pt, cmd_q);
+ return dma_cookie_status(c, cookie, txstate);
+}
+
static int pt_pause(struct dma_chan *dma_chan)
{
struct pt_dma_chan *chan = to_pt_chan(dma_chan);
@@ -291,8 +303,10 @@ static int pt_terminate_all(struct dma_chan *dma_chan)
{
struct pt_dma_chan *chan = to_pt_chan(dma_chan);
unsigned long flags;
+ struct pt_cmd_queue *cmd_q = &chan->pt->cmd_q;
LIST_HEAD(head);
+ iowrite32(SUPPORTED_INTERRUPTS, cmd_q->reg_control + 0x0010);
spin_lock_irqsave(&chan->vc.lock, flags);
vchan_get_all_descriptors(&chan->vc, &head);
spin_unlock_irqrestore(&chan->vc.lock, flags);
@@ -362,7 +376,7 @@ int pt_dmaengine_register(struct pt_device *pt)
dma_dev->device_prep_dma_memcpy = pt_prep_dma_memcpy;
dma_dev->device_prep_dma_interrupt = pt_prep_dma_interrupt;
dma_dev->device_issue_pending = pt_issue_pending;
- dma_dev->device_tx_status = dma_cookie_status;
+ dma_dev->device_tx_status = pt_tx_status;
dma_dev->device_pause = pt_pause;
dma_dev->device_resume = pt_resume;
dma_dev->device_terminate_all = pt_terminate_all;
diff --git a/drivers/dma/ptdma/ptdma.h b/drivers/dma/ptdma/ptdma.h
index afbf192c9230..d093c43b7d13 100644
--- a/drivers/dma/ptdma/ptdma.h
+++ b/drivers/dma/ptdma/ptdma.h
@@ -206,6 +206,9 @@ struct pt_cmd_queue {
unsigned int active;
unsigned int suspended;
+ /* Interrupt flag */
+ bool int_en;
+
/* Register addresses for queue */
void __iomem *reg_control;
u32 qcontrol; /* Cached control register */
@@ -318,7 +321,17 @@ void pt_core_destroy(struct pt_device *pt);
int pt_core_perform_passthru(struct pt_cmd_queue *cmd_q,
struct pt_passthru_engine *pt_engine);
+void pt_check_status_trans(struct pt_device *pt, struct pt_cmd_queue *cmd_q);
void pt_start_queue(struct pt_cmd_queue *cmd_q);
void pt_stop_queue(struct pt_cmd_queue *cmd_q);
+static inline void pt_core_disable_queue_interrupts(struct pt_device *pt)
+{
+ iowrite32(0, pt->cmd_q.reg_control + 0x000C);
+}
+
+static inline void pt_core_enable_queue_interrupts(struct pt_device *pt)
+{
+ iowrite32(SUPPORTED_INTERRUPTS, pt->cmd_q.reg_control + 0x000C);
+}
#endif
--
2.25.1
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