Re: [PATCH 11/15] soc: mediatek: Add cmdq_insert_backup_cookie before EOC for secure pkt

[Jason-JH Lin (林睿祥)]

Hi CK,

Thanks for the reivews.

On Tue, 2023-09-19 at 03:04 +0000, CK Hu (胡俊光) wrote:
> Hi, Jason:
> 
> On Tue, 2023-09-19 at 03:22 +0800, Jason-JH.Lin wrote:
> > Add cmdq_insert_backup_cookie to append some commands before EOC:
> > 1. Get GCE HW thread execute count from the GCE HW register.
> > 2. Add 1 to the execute count and then store into a shared memory.
> > 3. Set a software event siganl as secure irq to GCE HW.
> > 
> > Since the value of execute count + 1 is stored in a shared memory,
> > CMDQ driver in the normal world can use it to handle task done in
> > irq
> > handler and CMDQ driver in the secure world will use it to schedule
> > the task slot for each secure thread.
> > 
> > Signed-off-by: Jason-JH.Lin <jason-jh.lin@xxxxxxxxxxxx>
> > ---
> >  drivers/soc/mediatek/mtk-cmdq-helper.c | 9 +++++++++
> >  1 file changed, 9 insertions(+)
> > 
> > diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c
> > b/drivers/soc/mediatek/mtk-cmdq-helper.c
> > index bbb127620bb3..7b5392878aba 100644
> > --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> > +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> > @@ -8,6 +8,7 @@
> >  #include <linux/module.h>
> >  #include <linux/mailbox_controller.h>
> >  #include <linux/of.h>
> > +#include <linux/mailbox/mtk-cmdq-sec-mailbox.h>
> >  #include <linux/soc/mediatek/mtk-cmdq.h>
> >  
> >  #define CMDQ_WRITE_ENABLE_MASK	BIT(0)
> > @@ -153,7 +154,9 @@ void cmdq_pkt_destroy(struct cmdq_pkt *pkt)
> >  
> >  	dma_unmap_single(client->chan->mbox->dev, pkt->pa_base, pkt-
> > > buf_size,
> > 
> >  			 DMA_TO_DEVICE);
> > +
> >  	kfree(pkt->va_base);
> > +	kfree(pkt->sec_data);
> >  	kfree(pkt);
> >  }
> >  EXPORT_SYMBOL(cmdq_pkt_destroy);
> > @@ -458,6 +461,12 @@ int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
> >  	struct cmdq_instruction inst = { {0} };
> >  	int err;
> >  
> > +	if (pkt->sec_data) {
> > +		err = cmdq_sec_insert_backup_cookie(pkt);
> > +		if (err < 0)
> > +			return err;
> > +	}
> 
> Client driver could directly call cmdq_sec_insert_backup_cookie()
> before call cmdq_pkt_finalize(). I would like helper provide simple
> API
> and client driver would integrate simple API to what they want.
> 
OK, I'll move this to the client driver.
Thanks.

Regards,
Jason-JH.Lin

> Regards,
> CK
> 
> > +
> >  	/* insert EOC and generate IRQ for each command iteration */
> >  	inst.op = CMDQ_CODE_EOC;
> >  	inst.value = CMDQ_EOC_IRQ_EN;