From patchwork Wed Mar 31 07:33:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnaud Pouliquen X-Patchwork-Id: 12174567 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C3C55C433C1 for ; Wed, 31 Mar 2021 07:37:47 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 642AB619D3 for ; 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Wed, 31 Mar 2021 09:35:29 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id B6010100034; Wed, 31 Mar 2021 09:35:28 +0200 (CEST) Received: from Webmail-eu.st.com (sfhdag2node3.st.com [10.75.127.6]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id A5B9F224823; Wed, 31 Mar 2021 09:35:28 +0200 (CEST) Received: from localhost (10.75.127.44) by SFHDAG2NODE3.st.com (10.75.127.6) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 31 Mar 2021 09:35:28 +0200 From: Arnaud Pouliquen To: Bjorn Andersson , Ohad Ben-Cohen , Mathieu Poirier , Rob Herring , Alexandre Torgue CC: , , , , , Arnaud Pouliquen Subject: [PATCH v4 1/2] dt-bindings: remoteproc: stm32-rproc: add new mailbox channel for detach Date: Wed, 31 Mar 2021 09:33:46 +0200 Message-ID: <20210331073347.8293-2-arnaud.pouliquen@foss.st.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210331073347.8293-1-arnaud.pouliquen@foss.st.com> References: <20210331073347.8293-1-arnaud.pouliquen@foss.st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.44] X-ClientProxiedBy: SFHDAG1NODE1.st.com (10.75.127.1) To SFHDAG2NODE3.st.com (10.75.127.6) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.369, 18.0.761 definitions=2021-03-31_01:2021-03-30, 2021-03-31 signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210331_083536_700699_91602ECF X-CRM114-Status: GOOD ( 15.27 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add the "detach" mailbox item, that allows to define a mailbox to send a IPCC signal to the remote processor on remoteproc detach action. Signed-off-by: Arnaud Pouliquen Reviewed-by: Rob Herring --- .../bindings/remoteproc/st,stm32-rproc.yaml | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml b/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml index a1171dfba024..64afdcfb613d 100644 --- a/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml +++ b/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml @@ -65,16 +65,23 @@ properties: Unidirectional channel: - from local to remote, where ACK from the remote means that it is ready for shutdown + - description: | + A channel (d) used by the local proc to notify the remote proc that it + has to stop interprocessor communnication. + Unidirectional channel: + - from local to remote, where ACK from the remote means that communnication + as been stopped on the remote side. minItems: 1 - maxItems: 3 + maxItems: 4 mbox-names: items: - const: vq0 - const: vq1 - const: shutdown + - const: detach minItems: 1 - maxItems: 3 + maxItems: 4 memory-region: description: From patchwork Wed Mar 31 07:33:47 2021 Content-Type: text/plain; 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Wed, 31 Mar 2021 09:35:29 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 71CB310002A; Wed, 31 Mar 2021 09:35:29 +0200 (CEST) Received: from Webmail-eu.st.com (sfhdag2node3.st.com [10.75.127.6]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 6269D224825; Wed, 31 Mar 2021 09:35:29 +0200 (CEST) Received: from localhost (10.75.127.45) by SFHDAG2NODE3.st.com (10.75.127.6) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 31 Mar 2021 09:35:29 +0200 From: Arnaud Pouliquen To: Bjorn Andersson , Ohad Ben-Cohen , Mathieu Poirier , Rob Herring , Alexandre Torgue CC: , , , , , Arnaud Pouliquen Subject: [PATCH v4 2/2] remoteproc: stm32: add capability to detach Date: Wed, 31 Mar 2021 09:33:47 +0200 Message-ID: <20210331073347.8293-3-arnaud.pouliquen@foss.st.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210331073347.8293-1-arnaud.pouliquen@foss.st.com> References: <20210331073347.8293-1-arnaud.pouliquen@foss.st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.45] X-ClientProxiedBy: SFHDAG1NODE3.st.com (10.75.127.3) To SFHDAG2NODE3.st.com (10.75.127.6) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.369, 18.0.761 definitions=2021-03-31_01:2021-03-30, 2021-03-31 signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210331_083537_476662_5040A3F2 X-CRM114-Status: GOOD ( 23.88 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org A mechanism similar to the shutdown mailbox signal is implemented to detach a remote processor. Upon detachment, a signal is sent to the remote firmware, allowing it to perform specific actions such as stopping rpmsg communication. The Cortex-M hold boot is also disabled to allow the remote processor to restart in case of crash. Signed-off-by: Arnaud Pouliquen Reviewed-by: Mathieu Poirier Tested-by: Mathieu Poirier --- drivers/remoteproc/stm32_rproc.c | 39 ++++++++++++++++++++++++++++++-- 1 file changed, 37 insertions(+), 2 deletions(-) diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c index 3d45f51de4d0..7353f9e7e7af 100644 --- a/drivers/remoteproc/stm32_rproc.c +++ b/drivers/remoteproc/stm32_rproc.c @@ -28,7 +28,7 @@ #define RELEASE_BOOT 1 #define MBOX_NB_VQ 2 -#define MBOX_NB_MBX 3 +#define MBOX_NB_MBX 4 #define STM32_SMC_RCC 0x82001000 #define STM32_SMC_REG_WRITE 0x1 @@ -38,6 +38,7 @@ #define STM32_MBX_VQ1 "vq1" #define STM32_MBX_VQ1_ID 1 #define STM32_MBX_SHUTDOWN "shutdown" +#define STM32_MBX_DETACH "detach" #define RSC_TBL_SIZE 1024 @@ -336,6 +337,15 @@ static const struct stm32_mbox stm32_rproc_mbox[MBOX_NB_MBX] = { .tx_done = NULL, .tx_tout = 500, /* 500 ms time out */ }, + }, + { + .name = STM32_MBX_DETACH, + .vq_id = -1, + .client = { + .tx_block = true, + .tx_done = NULL, + .tx_tout = 200, /* 200 ms time out to detach should be fair enough */ + }, } }; @@ -461,6 +471,25 @@ static int stm32_rproc_attach(struct rproc *rproc) return stm32_rproc_set_hold_boot(rproc, true); } +static int stm32_rproc_detach(struct rproc *rproc) +{ + struct stm32_rproc *ddata = rproc->priv; + int err, dummy_data, idx; + + /* Inform the remote processor of the detach */ + idx = stm32_rproc_mbox_idx(rproc, STM32_MBX_DETACH); + if (idx >= 0 && ddata->mb[idx].chan) { + /* A dummy data is sent to allow to block on transmit */ + err = mbox_send_message(ddata->mb[idx].chan, + &dummy_data); + if (err < 0) + dev_warn(&rproc->dev, "warning: remote FW detach without ack\n"); + } + + /* Allow remote processor to auto-reboot */ + return stm32_rproc_set_hold_boot(rproc, false); +} + static int stm32_rproc_stop(struct rproc *rproc) { struct stm32_rproc *ddata = rproc->priv; @@ -597,7 +626,12 @@ stm32_rproc_get_loaded_rsc_table(struct rproc *rproc, size_t *table_sz) } done: - /* Assuming the resource table fits in 1kB is fair */ + /* + * Assuming the resource table fits in 1kB is fair. + * Notice for the detach, that this 1 kB memory area has to be reserved in the coprocessor + * firmware for the resource table. On detach, the remoteproc core re-initializes this + * entire area by overwriting it with the initial values stored in rproc->clean_table. + */ *table_sz = RSC_TBL_SIZE; return (struct resource_table *)ddata->rsc_va; } @@ -607,6 +641,7 @@ static const struct rproc_ops st_rproc_ops = { .start = stm32_rproc_start, .stop = stm32_rproc_stop, .attach = stm32_rproc_attach, + .detach = stm32_rproc_detach, .kick = stm32_rproc_kick, .load = rproc_elf_load_segments, .parse_fw = stm32_rproc_parse_fw,