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From: Doug Anderson <dianders@chromium.org>
To: Maulik Shah <mkshah@codeaurora.org>
Cc: Stephen Boyd <swboyd@chromium.org>,
	Matthias Kaehlcke <mka@chromium.org>,
	Evan Green <evgreen@chromium.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	LKML <linux-kernel@vger.kernel.org>,
	linux-arm-msm <linux-arm-msm@vger.kernel.org>,
	Andy Gross <agross@kernel.org>,
	Rajendra Nayak <rnayak@codeaurora.org>,
	Lina Iyer <ilina@codeaurora.org>,
	lsrao@codeaurora.org
Subject: Re: [PATCH v13 3/5] soc: qcom: rpmh: Invalidate SLEEP and WAKE TCSes before flushing new data
Date: Mon, 9 Mar 2020 16:42:30 -0700	[thread overview]
Message-ID: <CAD=FV=Xkqquyk907zAE-v7_QK_dOSmn1ooTzuXxP5Fckmhaw+Q@mail.gmail.com> (raw)
In-Reply-To: <1583746236-13325-4-git-send-email-mkshah@codeaurora.org>

Hi,

On Mon, Mar 9, 2020 at 2:31 AM Maulik Shah <mkshah@codeaurora.org> wrote:
>
> TCSes have previously programmed data when rpmh_flush is called.
> This can cause old data to trigger along with newly flushed.
>
> Fix this by cleaning SLEEP and WAKE TCSes before new data is flushed.
>
> With this there is no need to invoke rpmh_rsc_invalidate() call from
> rpmh_invalidate().
>
> Simplify rpmh_invalidate() by moving invalidate_batch() inside.
>
> Fixes: 600513dfeef3 ("drivers: qcom: rpmh: cache sleep/wake state requests")
> Signed-off-by: Maulik Shah <mkshah@codeaurora.org>
> ---
>  drivers/soc/qcom/rpmh.c | 36 +++++++++++++++---------------------
>  1 file changed, 15 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c
> index 03630ae..5bed8f4 100644
> --- a/drivers/soc/qcom/rpmh.c
> +++ b/drivers/soc/qcom/rpmh.c
> @@ -317,19 +317,6 @@ static int flush_batch(struct rpmh_ctrlr *ctrlr)
>         return ret;
>  }
>
> -static void invalidate_batch(struct rpmh_ctrlr *ctrlr)
> -{
> -       struct batch_cache_req *req, *tmp;
> -       unsigned long flags;
> -
> -       spin_lock_irqsave(&ctrlr->cache_lock, flags);
> -       list_for_each_entry_safe(req, tmp, &ctrlr->batch_cache, list)
> -               kfree(req);
> -       INIT_LIST_HEAD(&ctrlr->batch_cache);
> -       ctrlr->dirty = true;
> -       spin_unlock_irqrestore(&ctrlr->cache_lock, flags);
> -}
> -
>  /**
>   * rpmh_write_batch: Write multiple sets of RPMH commands and wait for the
>   * batch to finish.
> @@ -467,6 +454,11 @@ int rpmh_flush(struct rpmh_ctrlr *ctrlr)
>                 return 0;
>         }
>
> +       /* Invalidate the TCSes first to avoid stale data */
> +       do {
> +               ret = rpmh_rsc_invalidate(ctrlr_to_drv(ctrlr));
> +       } while (ret == -EAGAIN);
> +

You forgot to actually check the return value.

if (ret)
  return ret;


>         /* First flush the cached batch requests */
>         ret = flush_batch(ctrlr);
>         if (ret)
> @@ -503,19 +495,21 @@ int rpmh_flush(struct rpmh_ctrlr *ctrlr)
>   *
>   * @dev: The device making the request
>   *
> - * Invalidate the sleep and active values in the TCS blocks.
> + * Invalidate the sleep and wake values in batch_cache.

Thanks for updating this.  It was on my todo list.  Can you also
update the function description, which still says "Invalidate all
sleep and active sets sets."  While you're at it, remove the double
"sets".

  reply	other threads:[~2020-03-09 23:42 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-09  9:30 [PATCH v13 0/4] Invoke rpmh_flush for non OSI targets Maulik Shah
2020-03-09  9:30 ` [PATCH v13 1/5] arm64: dts: qcom: sc7180: Add cpuidle low power states Maulik Shah
2020-03-09  9:30 ` [PATCH v13 2/5] soc: qcom: rpmh: Update dirty flag only when data changes Maulik Shah
2020-03-09 23:42   ` Doug Anderson
2020-03-13  8:53     ` Maulik Shah
2020-03-09  9:30 ` [PATCH v13 3/5] soc: qcom: rpmh: Invalidate SLEEP and WAKE TCSes before flushing new data Maulik Shah
2020-03-09 23:42   ` Doug Anderson [this message]
2020-03-10 11:09     ` Maulik Shah
2020-03-09  9:30 ` [PATCH v13 4/5] soc: qcom: rpmh: Invoke rpmh_flush() for dirty caches Maulik Shah
2020-03-09 23:43   ` Doug Anderson
2020-03-10 11:19     ` Maulik Shah
2020-03-10 15:46       ` Doug Anderson
2020-03-11  6:36         ` Maulik Shah
2020-03-11 23:06           ` Doug Anderson
     [not found]             ` <5a5274ac-41f4-b06d-ff49-c00cef67aa7f@codeaurora.org>
2020-03-12 15:11               ` Doug Anderson
2020-03-25 17:15                 ` Maulik Shah
2020-03-26 18:08                   ` Doug Anderson
2020-03-09  9:30 ` [PATCH v13 5/5] drivers: qcom: Update rpmh clients to use start and end transactions Maulik Shah
2020-03-09 23:44   ` Doug Anderson
2020-03-10 11:46     ` Maulik Shah
2020-03-10 15:46       ` Doug Anderson
2020-03-11 23:02   ` Doug Anderson
2020-03-09 23:42 ` [PATCH v13 0/4] Invoke rpmh_flush for non OSI targets Doug Anderson
2020-03-10 11:49   ` Maulik Shah

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