linux-kernel - Re: [PATCH] optee: support wq_sleep

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Message-ID: <0e9e3ec2079c1a9ac49ea1b93370a48b8e4a78cc.camel@mediatek.com>
Date: Mon, 29 Jan 2024 02:32:46 +0000
From: Gavin Liu (劉哲廷) <Gavin.Liu@...iatek.com>
To: "jerome.forissier@...aro.org" <jerome.forissier@...aro.org>,
	"jens.wiklander@...aro.org" <jens.wiklander@...aro.org>,
	"matthias.bgg@...il.com" <matthias.bgg@...il.com>, "sumit.garg@...aro.org"
	<sumit.garg@...aro.org>
CC: "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-mediatek@...ts.infradead.org"
	<linux-mediatek@...ts.infradead.org>,
	"angelogioacchino.delregno@...labora.com"
	<angelogioacchino.delregno@...labora.com>, "op-tee@...ts.trustedfirmware.org"
	<op-tee@...ts.trustedfirmware.org>, Project_Global_Chrome_Upstream_Group
	<Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH] optee: support wq_sleep_timeout

Hi Jerome,

Thanks very much for the reviewing.

On Thu, 2024-01-25 at 10:46 +0100, Jerome Forissier wrote:
>  	 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>  
> 
> On 1/25/24 06:27, gavin.liu via OP-TEE wrote:
> > From: Gavin Liu <gavin.liu@...iatek.com>
> > 
> > Add wq_sleep_timeout to support self waking when timeout for secure
> > driver usage.
> > 
> > Signed-off-by: Gavin Liu <gavin.liu@...iatek.com>
> > ---
> >  drivers/tee/optee/notif.c         |  9 +++++++--
> >  drivers/tee/optee/optee_private.h |  2 +-
> >  drivers/tee/optee/rpc.c           | 10 ++++++++--
> >  3 files changed, 16 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/tee/optee/notif.c b/drivers/tee/optee/notif.c
> > index 05212842b0a5..d5e5c0645609 100644
> > --- a/drivers/tee/optee/notif.c
> > +++ b/drivers/tee/optee/notif.c
> > @@ -29,7 +29,7 @@ static bool have_key(struct optee *optee, u_int
> key)
> >  return false;
> >  }
> >  
> > -int optee_notif_wait(struct optee *optee, u_int key)
> > +int optee_notif_wait(struct optee *optee, u_int key, u32 timeout)
> >  {
> >  unsigned long flags;
> >  struct notif_entry *entry;
> > @@ -70,7 +70,12 @@ int optee_notif_wait(struct optee *optee, u_int
> key)
> >   * Unlock temporarily and wait for completion.
> >   */
> >  spin_unlock_irqrestore(&optee->notif.lock, flags);
> > -wait_for_completion(&entry->c);
> > +if (timeout != 0) {
> > +if (!wait_for_completion_timeout(&entry->c, timeout))
> > +rc = -ETIMEDOUT;
> > +} else {
> > +wait_for_completion(&entry->c);
> > +}
> >  spin_lock_irqsave(&optee->notif.lock, flags);
> >  
> >  list_del(&entry->link);
> > diff --git a/drivers/tee/optee/optee_private.h
> b/drivers/tee/optee/optee_private.h
> > index 7a5243c78b55..da990c4016ec 100644
> > --- a/drivers/tee/optee/optee_private.h
> > +++ b/drivers/tee/optee/optee_private.h
> > @@ -252,7 +252,7 @@ struct optee_call_ctx {
> >  
> >  int optee_notif_init(struct optee *optee, u_int max_key);
> >  void optee_notif_uninit(struct optee *optee);
> > -int optee_notif_wait(struct optee *optee, u_int key);
> > +int optee_notif_wait(struct optee *optee, u_int key, u32 timeout);
> >  int optee_notif_send(struct optee *optee, u_int key);
> >  
> >  u32 optee_supp_thrd_req(struct tee_context *ctx, u32 func, size_t
> num_params,
> > diff --git a/drivers/tee/optee/rpc.c b/drivers/tee/optee/rpc.c
> > index e69bc6380683..14e6246aaf05 100644
> > --- a/drivers/tee/optee/rpc.c
> > +++ b/drivers/tee/optee/rpc.c
> > @@ -130,6 +130,8 @@ static void
> handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx,
> >  static void handle_rpc_func_cmd_wq(struct optee *optee,
> >     struct optee_msg_arg *arg)
> >  {
> > +int rc = 0;
> > +
> >  if (arg->num_params != 1)
> >  goto bad;
> >  
> > @@ -139,7 +141,8 @@ static void handle_rpc_func_cmd_wq(struct optee
> *optee,
> >  
> >  switch (arg->params[0].u.value.a) {
> >  case OPTEE_RPC_NOTIFICATION_WAIT:
> > -if (optee_notif_wait(optee, arg->params[0].u.value.b))
> > +rc = optee_notif_wait(optee, arg->params[0].u.value.b, arg-
> >params[0].u.value.c);
> 
> optee/optee_rpc_cmd.h needs updating (near "Waiting on notification")
> to reflect the meaning
> of value.c.
> 
Ok, I will update the patch for this.

> Was value.c required to be zero prior to this change? Otherwise this
> could lead to undefined
> behavior.
>  
> 
This value comes from optee-os, and it is zero by default now.

> > +if (rc)
> >  goto bad;
> >  break;
> >  case OPTEE_RPC_NOTIFICATION_SEND:
> > @@ -153,7 +156,10 @@ static void handle_rpc_func_cmd_wq(struct
> optee *optee,
> >  arg->ret = TEEC_SUCCESS;
> >  return;
> >  bad:
> > -arg->ret = TEEC_ERROR_BAD_PARAMETERS;
> > +if (rc == -ETIMEDOUT)
> > +arg->ret = TEEC_ERROR_BUSY;
> > +else
> > +arg->ret = TEEC_ERROR_BAD_PARAMETERS;
> >  }
> >  
> >  static void handle_rpc_func_cmd_wait(struct optee_msg_arg *arg)
> 
> -- 
> Jerome