linux-kernel - [PATCH v2 4/4] misc: fastrpc: Add support for users to clean up DSP user PD

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Message-ID: <1698310400-5601-5-git-send-email-quic_ekangupt@quicinc.com>
Date:   Thu, 26 Oct 2023 14:23:20 +0530
From:   Ekansh Gupta <quic_ekangupt@...cinc.com>
To:     <srinivas.kandagatla@...aro.org>, <linux-arm-msm@...r.kernel.org>
CC:     <gregkh@...uxfoundation.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 4/4] misc: fastrpc: Add support for users to clean up DSP user PD

Add a control mechanism for users to clean up DSP user PD. This
method can be used by users for handling any unexpected hang
scenarios on DSP PD. User can clean up DSP PD and restart the
user PD again.

Signed-off-by: Ekansh Gupta <quic_ekangupt@...cinc.com>
---
 drivers/misc/fastrpc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index e012ff25..7b1a41d 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -2254,6 +2254,11 @@ static int fastrpc_internal_control(struct fastrpc_user *fl,
 	case FASTRPC_CONTROL_RPC_POLL:
 		err = fastrpc_manage_poll_mode(fl, cp->lp.enable, cp->lp.latency);
 		break;
+	case FASTRPC_CONTROL_DSPPROCESS_CLEAN:
+		err = fastrpc_release_current_dsp_process(fl);
+		if (!err)
+			fastrpc_queue_pd_status(fl, fl->cctx->domain_id, FASTRPC_USERPD_FORCE_KILL);
+		break;
 	default:
 		err = -EBADRQC;
 		break;
-- 
2.7.4