diff mbox series

[v2,12/14] soc: mediatek: cmdq: add loop function

Message ID 1574819937-6246-14-git-send-email-dennis-yc.hsieh@mediatek.com (mailing list archive)
State New, archived
Headers show
Series [v2,01/14] dt-binding: gce: add gce header file for mt6779 | expand

Commit Message

Dennis-YC Hsieh Nov. 27, 2019, 1:58 a.m. UTC 
Add finalize loop function in cmdq helper functions which loop whole pkt
in gce hardware thread without cpu operation.

Signed-off-by: Dennis YC Hsieh <dennis-yc.hsieh@mediatek.com>
---
 drivers/soc/mediatek/mtk-cmdq-helper.c | 22 ++++++++++++++++++++++
 include/linux/soc/mediatek/mtk-cmdq.h  |  8 ++++++++
 2 files changed, 30 insertions(+)

Comments

CK Hu (胡俊光) Dec. 11, 2019, 1:48 a.m. UTC | #1 
Hi, Dennis:

On Wed, 2019-11-27 at 09:58 +0800, Dennis YC Hsieh wrote:
> Add finalize loop function in cmdq helper functions which loop whole pkt
> in gce hardware thread without cpu operation.
> 
> Signed-off-by: Dennis YC Hsieh <dennis-yc.hsieh@mediatek.com>
> ---
>  drivers/soc/mediatek/mtk-cmdq-helper.c | 22 ++++++++++++++++++++++
>  include/linux/soc/mediatek/mtk-cmdq.h  |  8 ++++++++
>  2 files changed, 30 insertions(+)
> 
> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> index 38e0c13e1922..10a9b4481e58 100644
> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> @@ -414,6 +414,28 @@ int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
>  }
>  EXPORT_SYMBOL(cmdq_pkt_finalize);
>  
> +int cmdq_pkt_finalize_loop(struct cmdq_pkt *pkt)
> +{
> +	struct cmdq_client *cl = pkt->cl;
> +	struct cmdq_instruction inst = { {0} };
> +	int err;
> +
> +	/* insert EOC and generate IRQ for each command iteration */
> +	inst.op = CMDQ_CODE_EOC;
> +	err = cmdq_pkt_append_command(pkt, inst);
> +	if (err < 0)
> +		return err;

It looks like you want a pkt execute command repeatedly, but why do you
repeatedly trigger IRQ? This IRQ would do nothing because this pkt would
never finish.

> +
> +	/* JUMP abaolute to begin */
> +	inst.op = CMDQ_CODE_JUMP;
> +	inst.offset = 1;
> +	inst.value = pkt->pa_base >> cmdq_mbox_shift(cl->chan);
> +	err = cmdq_pkt_append_command(pkt, inst);

Why not just export this function as cmdq_pkt_jump()? Let client decide
where to jump would be more flexible.

Regards,
CK

> +
> +	return err;
> +}
> +EXPORT_SYMBOL(cmdq_pkt_finalize_loop);
> +
>  static void cmdq_pkt_flush_async_cb(struct cmdq_cb_data data)
>  {
>  	struct cmdq_pkt *pkt = (struct cmdq_pkt *)data.data;
> diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
> index 998bc90f9da9..d15d8c941992 100644
> --- a/include/linux/soc/mediatek/mtk-cmdq.h
> +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> @@ -212,6 +212,14 @@ int cmdq_pkt_assign(struct cmdq_pkt *pkt, u16 reg_idx, u32 value);
>   */
>  int cmdq_pkt_finalize(struct cmdq_pkt *pkt);
>  
> +/**
> + * cmdq_pkt_finalize_loop() - Append EOC and jump command to loop pkt.
> + * @pkt:	the CMDQ packet
> + *
> + * Return: 0 for success; else the error code is returned
> + */
> +int cmdq_pkt_finalize_loop(struct cmdq_pkt *pkt);
> +
>  /**
>   * cmdq_pkt_flush_async() - trigger CMDQ to asynchronously execute the CMDQ
>   *                          packet and call back at the end of done packet
Dennis-YC Hsieh Dec. 12, 2019, 1:37 a.m. UTC | #2 
Hi CK,

On Wed, 2019-12-11 at 09:48 +0800, CK Hu wrote:
> Hi, Dennis:
> 
> On Wed, 2019-11-27 at 09:58 +0800, Dennis YC Hsieh wrote:
> > Add finalize loop function in cmdq helper functions which loop whole pkt
> > in gce hardware thread without cpu operation.
> > 
> > Signed-off-by: Dennis YC Hsieh <dennis-yc.hsieh@mediatek.com>
> > ---
> >  drivers/soc/mediatek/mtk-cmdq-helper.c | 22 ++++++++++++++++++++++
> >  include/linux/soc/mediatek/mtk-cmdq.h  |  8 ++++++++
> >  2 files changed, 30 insertions(+)
> > 
> > diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> > index 38e0c13e1922..10a9b4481e58 100644
> > --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> > +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> > @@ -414,6 +414,28 @@ int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
> >  }
> >  EXPORT_SYMBOL(cmdq_pkt_finalize);
> >  
> > +int cmdq_pkt_finalize_loop(struct cmdq_pkt *pkt)
> > +{
> > +	struct cmdq_client *cl = pkt->cl;
> > +	struct cmdq_instruction inst = { {0} };
> > +	int err;
> > +
> > +	/* insert EOC and generate IRQ for each command iteration */
> > +	inst.op = CMDQ_CODE_EOC;
> > +	err = cmdq_pkt_append_command(pkt, inst);
> > +	if (err < 0)
> > +		return err;
> 
> It looks like you want a pkt execute command repeatedly, but why do you
> repeatedly trigger IRQ? This IRQ would do nothing because this pkt would
> never finish.
> 

see following section

> > +
> > +	/* JUMP abaolute to begin */
> > +	inst.op = CMDQ_CODE_JUMP;
> > +	inst.offset = 1;
> > +	inst.value = pkt->pa_base >> cmdq_mbox_shift(cl->chan);
> > +	err = cmdq_pkt_append_command(pkt, inst);
> 
> Why not just export this function as cmdq_pkt_jump()? Let client decide
> where to jump would be more flexible.
> 
> Regards,
> CK
> 

ok, I will remove this part and expose cmdq_pkt_jump()


Regards,
Dennis

> > +
> > +	return err;
> > +}
> > +EXPORT_SYMBOL(cmdq_pkt_finalize_loop);
> > +
> >  static void cmdq_pkt_flush_async_cb(struct cmdq_cb_data data)
> >  {
> >  	struct cmdq_pkt *pkt = (struct cmdq_pkt *)data.data;
> > diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
> > index 998bc90f9da9..d15d8c941992 100644
> > --- a/include/linux/soc/mediatek/mtk-cmdq.h
> > +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> > @@ -212,6 +212,14 @@ int cmdq_pkt_assign(struct cmdq_pkt *pkt, u16 reg_idx, u32 value);
> >   */
> >  int cmdq_pkt_finalize(struct cmdq_pkt *pkt);
> >  
> > +/**
> > + * cmdq_pkt_finalize_loop() - Append EOC and jump command to loop pkt.
> > + * @pkt:	the CMDQ packet
> > + *
> > + * Return: 0 for success; else the error code is returned
> > + */
> > +int cmdq_pkt_finalize_loop(struct cmdq_pkt *pkt);
> > +
> >  /**
> >   * cmdq_pkt_flush_async() - trigger CMDQ to asynchronously execute the CMDQ
> >   *                          packet and call back at the end of done packet
> 
>
diff mbox series

Patch

diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
index 38e0c13e1922..10a9b4481e58 100644
--- a/drivers/soc/mediatek/mtk-cmdq-helper.c
+++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
@@ -414,6 +414,28 @@  int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
 }
 EXPORT_SYMBOL(cmdq_pkt_finalize);
 
+int cmdq_pkt_finalize_loop(struct cmdq_pkt *pkt)
+{
+	struct cmdq_client *cl = pkt->cl;
+	struct cmdq_instruction inst = { {0} };
+	int err;
+
+	/* insert EOC and generate IRQ for each command iteration */
+	inst.op = CMDQ_CODE_EOC;
+	err = cmdq_pkt_append_command(pkt, inst);
+	if (err < 0)
+		return err;
+
+	/* JUMP abaolute to begin */
+	inst.op = CMDQ_CODE_JUMP;
+	inst.offset = 1;
+	inst.value = pkt->pa_base >> cmdq_mbox_shift(cl->chan);
+	err = cmdq_pkt_append_command(pkt, inst);
+
+	return err;
+}
+EXPORT_SYMBOL(cmdq_pkt_finalize_loop);
+
 static void cmdq_pkt_flush_async_cb(struct cmdq_cb_data data)
 {
 	struct cmdq_pkt *pkt = (struct cmdq_pkt *)data.data;
diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
index 998bc90f9da9..d15d8c941992 100644
--- a/include/linux/soc/mediatek/mtk-cmdq.h
+++ b/include/linux/soc/mediatek/mtk-cmdq.h
@@ -212,6 +212,14 @@  int cmdq_pkt_assign(struct cmdq_pkt *pkt, u16 reg_idx, u32 value);
  */
 int cmdq_pkt_finalize(struct cmdq_pkt *pkt);
 
+/**
+ * cmdq_pkt_finalize_loop() - Append EOC and jump command to loop pkt.
+ * @pkt:	the CMDQ packet
+ *
+ * Return: 0 for success; else the error code is returned
+ */
+int cmdq_pkt_finalize_loop(struct cmdq_pkt *pkt);
+
 /**
  * cmdq_pkt_flush_async() - trigger CMDQ to asynchronously execute the CMDQ
  *                          packet and call back at the end of done packet