linux-kernel - [PATCH v3 4/5] misc: fastrpc: Add support for users to clean up DSP user PD

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Message-ID: <20231121112454.12764-5-quic_ekangupt@quicinc.com>
Date:   Tue, 21 Nov 2023 16:54:53 +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 v3 4/5] 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>
---
Changes in v3:
  - Rebase the patch to latest kernel version

 drivers/misc/fastrpc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index 72ed14174363..97895fce1228 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;
-- 
2.17.1