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Tue, 16 May 2023 13:24:26 +0000 From: Daniel Baluta To: broonie@kernel.org, alsa-devel@alsa-project.org Cc: linux-kernel@vger.kernel.org, pierre-louis.bossart@linux.intel.com, lgirdwood@gmail.com, peter.ujfalusi@linux.intel.com, yung-chuan.liao@linux.intel.com, ranjani.sridharan@linux.intel.com, kai.vehmanen@linux.intel.com, daniel.baluta@gmail.com Subject: [RESEND PATCH 2/2] ASoC: sof: Improve sof_ipc4_bytes_ext_put function Date: Tue, 16 May 2023 16:24:01 +0300 Message-Id: <20230516132401.205563-3-daniel.baluta@oss.nxp.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230516132401.205563-1-daniel.baluta@oss.nxp.com> References: <20230516132401.205563-1-daniel.baluta@oss.nxp.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-ClientProxiedBy: AS4P195CA0032.EURP195.PROD.OUTLOOK.COM (2603:10a6:20b:65a::6) To VI1PR04MB5151.eurprd04.prod.outlook.com (2603:10a6:803:61::28) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: VI1PR04MB5151:EE_|DU0PR04MB9635:EE_ X-MS-Office365-Filtering-Correlation-Id: afd348d5-9271-4910-c6de-08db5610dedd X-MS-Exchange-SharedMailbox-RoutingAgent-Processed: True X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.8 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: From: Paul Olaru The function is improved in the way that if the firmware returns a validation error on the newly sent bytes, then the kernel will automatically restore to the old bytes value for a given kcontrol. This way, if the firmware rejects a data blob then the kernel will also reject it, instead of saving it for the next suspend/resume cycle. The old behaviour is that the kernel would save it anyway and on next firmware boot it would apply the previously-rejected configuration, leading to errors during playback. Additionally, the function also saves previously validated configurations, so that if the firmware does end up rejecting a new bytes value the kernel can send an old, previously-valid configuration. Reviewed-by: Daniel Baluta Reviewed-by: Péter Ujfalusi Signed-off-by: Paul Olaru Signed-off-by: Daniel Baluta --- sound/soc/sof/ipc4-control.c | 39 ++++++++++++++++++++++++++++++++---- 1 file changed, 35 insertions(+), 4 deletions(-) diff --git a/sound/soc/sof/ipc4-control.c b/sound/soc/sof/ipc4-control.c index 6f0698be9451..c6d404d44097 100644 --- a/sound/soc/sof/ipc4-control.c +++ b/sound/soc/sof/ipc4-control.c @@ -54,6 +54,26 @@ static int sof_ipc4_set_get_kcontrol_data(struct snd_sof_control *scontrol, msg->primary |= SOF_IPC4_MOD_INSTANCE(swidget->instance_id); ret = iops->set_get_data(sdev, msg, msg->data_size, set); + if (!set) + goto unlock; + + /* It is a set-data operation, and we have a valid backup that we can restore */ + if (ret < 0) { + if (!scontrol->old_ipc_control_data) + goto unlock; + /* + * Current ipc_control_data is not valid, we use the last known good + * configuration + */ + memcpy(scontrol->ipc_control_data, scontrol->old_ipc_control_data, + scontrol->max_size); + kfree(scontrol->old_ipc_control_data); + scontrol->old_ipc_control_data = NULL; + /* Send the last known good configuration to firmware */ + ret = iops->set_get_data(sdev, msg, msg->data_size, set); + if (ret < 0) + goto unlock; + } unlock: if (lock) @@ -327,13 +347,24 @@ static int sof_ipc4_bytes_ext_put(struct snd_sof_control *scontrol, return -EINVAL; } + if (!scontrol->old_ipc_control_data) { + /* Create a backup of the current, valid bytes control */ + scontrol->old_ipc_control_data = kmemdup(scontrol->ipc_control_data, + scontrol->max_size, GFP_KERNEL); + if (!scontrol->old_ipc_control_data) + return -ENOMEM; + } + /* Copy the whole binary data which includes the ABI header and the payload */ - if (copy_from_user(data, tlvd->tlv, header.length)) + if (copy_from_user(data, tlvd->tlv, header.length)) { + memcpy(scontrol->ipc_control_data, scontrol->old_ipc_control_data, + scontrol->max_size); + kfree(scontrol->old_ipc_control_data); + scontrol->old_ipc_control_data = NULL; return -EFAULT; + } - sof_ipc4_set_get_bytes_data(sdev, scontrol, true, true); - - return 0; + return sof_ipc4_set_get_bytes_data(sdev, scontrol, true, true); } static int _sof_ipc4_bytes_ext_get(struct snd_sof_control *scontrol, -- 2.25.1