From patchwork Tue Jun 23 04:08:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Tipton X-Patchwork-Id: 11619717 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 410FA138C for ; Tue, 23 Jun 2020 04:08:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 293122078E for ; Tue, 23 Jun 2020 04:08:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="hiHnRm4C" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728275AbgFWEIu (ORCPT ); Tue, 23 Jun 2020 00:08:50 -0400 Received: from mail29.static.mailgun.info ([104.130.122.29]:39604 "EHLO mail29.static.mailgun.info" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732198AbgFWEIu (ORCPT ); Tue, 23 Jun 2020 00:08:50 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1592885328; h=Content-Transfer-Encoding: MIME-Version: References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=5m+5niclwDk74XQIzoFk8E1FDh87wnYg8/Tfofn+4C4=; b=hiHnRm4Ciq6nKOOeypjdEtwJ8MZ4b3eXQnRb5Xpac4f2wF7jm2kvTzUA0/uXHVysvdy8+J70 E+uXPittfiYQM3KmETS/GdB5ZMsRV3sLDisb4lSfb7jbMHuJgNy73QIlxjA4J/2Jp4U4yt2t C14Dmr5P6CMm+nOX45jx7pSHYx8= X-Mailgun-Sending-Ip: 104.130.122.29 X-Mailgun-Sid: WyI1MzIzYiIsICJsaW51eC1hcm0tbXNtQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n19.prod.us-east-1.postgun.com with SMTP id 5ef1803f86de6ccd442088c9 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Tue, 23 Jun 2020 04:08:31 GMT Received: by smtp.codeaurora.org (Postfix, from userid 1001) id AEE30C43391; Tue, 23 Jun 2020 04:08:30 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-caf-mail-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=2.0 tests=ALL_TRUSTED,SPF_NONE, URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mdtipton-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: mdtipton) by smtp.codeaurora.org (Postfix) with ESMTPSA id 9A406C433CA; Tue, 23 Jun 2020 04:08:29 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 9A406C433CA Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=mdtipton@codeaurora.org From: Mike Tipton To: georgi.djakov@linaro.org Cc: bjorn.andersson@linaro.org, agross@kernel.org, linux-pm@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Mike Tipton Subject: [PATCH 1/4] interconnect: qcom: Support bcm-voter-specific TCS wait behavior Date: Mon, 22 Jun 2020 21:08:11 -0700 Message-Id: <20200623040814.23791-2-mdtipton@codeaurora.org> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20200623040814.23791-1-mdtipton@codeaurora.org> References: <20200623040814.23791-1-mdtipton@codeaurora.org> MIME-Version: 1.0 Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Currently, all bcm-voters set tcs_cmd::wait=true for the last VCD command in each TCS (AMC, WAKE, and SLEEP). However, some bcm-voters don't need the completion and instead need to optimize for latency. For instance, disabling wait-for-completion in the WAKE set can decrease resume latency and allow for certain operations to occur in parallel with the WAKE TCS triggering. This is only safe in very specific situations. Keep the default behavior of always waiting, but allow it to be overridden in devicetree. Signed-off-by: Mike Tipton --- drivers/interconnect/qcom/bcm-voter.c | 32 ++++++++++++++++++--------- 1 file changed, 21 insertions(+), 11 deletions(-) diff --git a/drivers/interconnect/qcom/bcm-voter.c b/drivers/interconnect/qcom/bcm-voter.c index 2a11a63e7217..e9f66f5c8a91 100644 --- a/drivers/interconnect/qcom/bcm-voter.c +++ b/drivers/interconnect/qcom/bcm-voter.c @@ -27,6 +27,7 @@ static DEFINE_MUTEX(bcm_voter_lock); * @commit_list: list containing bcms to be committed to hardware * @ws_list: list containing bcms that have different wake/sleep votes * @voter_node: list of bcm voters + * @tcs_wait: mask for which buckets require TCS completion */ struct bcm_voter { struct device *dev; @@ -35,6 +36,7 @@ struct bcm_voter { struct list_head commit_list; struct list_head ws_list; struct list_head voter_node; + u32 tcs_wait; }; static int cmp_vcd(void *priv, struct list_head *a, struct list_head *b) @@ -89,7 +91,7 @@ static void bcm_aggregate(struct qcom_icc_bcm *bcm) } static inline void tcs_cmd_gen(struct tcs_cmd *cmd, u64 vote_x, u64 vote_y, - u32 addr, bool commit) + u32 addr, bool commit, bool wait) { bool valid = true; @@ -114,15 +116,16 @@ static inline void tcs_cmd_gen(struct tcs_cmd *cmd, u64 vote_x, u64 vote_y, * Set the wait for completion flag on command that need to be completed * before the next command. */ - cmd->wait = commit; + cmd->wait = wait; } -static void tcs_list_gen(struct list_head *bcm_list, int bucket, - struct tcs_cmd tcs_list[MAX_BCMS], +static void tcs_list_gen(struct bcm_voter *voter, int bucket, + struct tcs_cmd tcs_list[MAX_VCD], int n[MAX_VCD + 1]) { + struct list_head *bcm_list = &voter->commit_list; struct qcom_icc_bcm *bcm; - bool commit; + bool commit, wait; size_t idx = 0, batch = 0, cur_vcd_size = 0; memset(n, 0, sizeof(int) * (MAX_VCD + 1)); @@ -135,8 +138,11 @@ static void tcs_list_gen(struct list_head *bcm_list, int bucket, commit = true; cur_vcd_size = 0; } + + wait = commit && (voter->tcs_wait & BIT(bucket)); + tcs_cmd_gen(&tcs_list[idx], bcm->vote_x[bucket], - bcm->vote_y[bucket], bcm->addr, commit); + bcm->vote_y[bucket], bcm->addr, commit, wait); idx++; n[batch]++; /* @@ -261,8 +267,7 @@ int qcom_icc_bcm_voter_commit(struct bcm_voter *voter) * Construct the command list based on a pre ordered list of BCMs * based on VCD. */ - tcs_list_gen(&voter->commit_list, QCOM_ICC_BUCKET_AMC, cmds, commit_idx); - + tcs_list_gen(voter, QCOM_ICC_BUCKET_AMC, cmds, commit_idx); if (!commit_idx[0]) goto out; @@ -302,7 +307,7 @@ int qcom_icc_bcm_voter_commit(struct bcm_voter *voter) list_sort(NULL, &voter->commit_list, cmp_vcd); - tcs_list_gen(&voter->commit_list, QCOM_ICC_BUCKET_WAKE, cmds, commit_idx); + tcs_list_gen(voter, QCOM_ICC_BUCKET_WAKE, cmds, commit_idx); ret = rpmh_write_batch(voter->dev, RPMH_WAKE_ONLY_STATE, cmds, commit_idx); if (ret) { @@ -310,7 +315,7 @@ int qcom_icc_bcm_voter_commit(struct bcm_voter *voter) goto out; } - tcs_list_gen(&voter->commit_list, QCOM_ICC_BUCKET_SLEEP, cmds, commit_idx); + tcs_list_gen(voter, QCOM_ICC_BUCKET_SLEEP, cmds, commit_idx); ret = rpmh_write_batch(voter->dev, RPMH_SLEEP_STATE, cmds, commit_idx); if (ret) { @@ -329,6 +334,7 @@ EXPORT_SYMBOL_GPL(qcom_icc_bcm_voter_commit); static int qcom_icc_bcm_voter_probe(struct platform_device *pdev) { + struct device_node *np = pdev->dev.of_node; struct bcm_voter *voter; voter = devm_kzalloc(&pdev->dev, sizeof(*voter), GFP_KERNEL); @@ -336,7 +342,11 @@ static int qcom_icc_bcm_voter_probe(struct platform_device *pdev) return -ENOMEM; voter->dev = &pdev->dev; - voter->np = pdev->dev.of_node; + voter->np = np; + + if (of_property_read_u32(np, "qcom,tcs-wait", &voter->tcs_wait)) + voter->tcs_wait = QCOM_ICC_TAG_ALWAYS; + mutex_init(&voter->lock); INIT_LIST_HEAD(&voter->commit_list); INIT_LIST_HEAD(&voter->ws_list);