From patchwork Fri May 20 18:55:29 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alex Elder X-Patchwork-Id: 574579 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B2F2CC433F5 for ; Fri, 20 May 2022 18:56:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1353124AbiETSz4 (ORCPT ); Fri, 20 May 2022 14:55:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37134 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1353053AbiETSzy (ORCPT ); Fri, 20 May 2022 14:55:54 -0400 Received: from mail-il1-x12d.google.com (mail-il1-x12d.google.com [IPv6:2607:f8b0:4864:20::12d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 574F1BC4 for ; Fri, 20 May 2022 11:55:43 -0700 (PDT) Received: by mail-il1-x12d.google.com with SMTP id o16so6123283ilq.8 for ; Fri, 20 May 2022 11:55:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=uoOxtouvB2bKJ6UVCiMo5Cjkg2ZKrup85zpIf1aDzB0=; b=e6Ryj7Zq+U3wpBHXDap84P4ZvYpT25PESVB+ckcxbP74nbMKo57QfygxXO/yHpPO8e uOtWnwM4TXYGHrGlmpUjeFpwAlDpkHJzs8dpIekI9p2s0d90tZDE4FIl4SR3BkKsuXqU nYTYR89GwrK6FulFl5K1IuzEOmISeXfZnibulWgmNb3yNc/9w8hyfcjMG1PlRt2vlwhV bM50/9C5qQDLMxnitjvIOf5m/bQ0a+aLH37m0tWgCsYZxEQdk6ennfynRnESgPLBcvf5 JxMUQQKOeq5CEAuOc/Wm1Kiw07e9WWIBoWBPH5g77XkjEqV7SRb318lWY0Vv9i/gAxUG YIsA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=uoOxtouvB2bKJ6UVCiMo5Cjkg2ZKrup85zpIf1aDzB0=; b=rO8sixiYS7Cl3nMOQlQ/wrhRkrP5G3rRNMNsARiljfXeqw0A0KzfeE4aQjMQoYq5I6 jEZdG0H6br/EOGsKG1sAEFg2QGJE/NRjckEVjAV3sp7/ULF3tTevRm9IvIl7THvCt7RL UNW70w0zkjCwAuGLEtKDqYPGmPtdGQ78gmw2kOeI7jZ1KIlZ+BpDnZctAAuvhMTdACMQ BsSSEEqzQlhTqah+bIQeqsytsXnmOKlxVemj3Qu+bEvEndEbP/++ulsJguw8mB7INq/Y CUgjELaNTahFPT9y/rWJzQ+IKzJxCzpr50f8L6EXEzhs2IWT4t76dVPtDDzttP3IfYvg Er5w== X-Gm-Message-State: AOAM531SuJJKM3QKmm5vy/X1KWGpmd6oj4Ap/TYMp5g49OeUAjoWmfZ7 YON5aQPqmagpoYDL4GqJgUzsow== X-Google-Smtp-Source: ABdhPJxeYYviCHcahevr5mjCfmLcKP4GJXMMv54IZHq8Xbvi5lH3+cx/g0o6T3d/qNDfCSv9uYiLuQ== X-Received: by 2002:a05:6e02:1585:b0:2c2:5b2c:e3e5 with SMTP id m5-20020a056e02158500b002c25b2ce3e5mr672221ilu.76.1653072942617; Fri, 20 May 2022 11:55:42 -0700 (PDT) Received: from presto.localdomain (c-73-185-129-58.hsd1.mn.comcast.net. [73.185.129.58]) by smtp.gmail.com with ESMTPSA id a6-20020a056638058600b0032b3a7817acsm871958jar.112.2022.05.20.11.55.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 May 2022 11:55:42 -0700 (PDT) From: Alex Elder To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com Cc: mka@chromium.org, evgreen@chromium.org, bjorn.andersson@linaro.org, quic_cpratapa@quicinc.com, quic_avuyyuru@quicinc.com, quic_jponduru@quicinc.com, quic_subashab@quicinc.com, elder@kernel.org, netdev@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH net-next 4/8] net: ipa: kill gsi_trans_commit_wait_timeout() Date: Fri, 20 May 2022 13:55:29 -0500 Message-Id: <20220520185533.877920-5-elder@linaro.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220520185533.877920-1-elder@linaro.org> References: <20220520185533.877920-1-elder@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Since the beginning gsi_trans_commit_wait_timeout() has existed to provide a way to allow waiting a limited time for a transaction to complete. But that function has never been used. In fact, there is no use for this function, because a transaction committed to hardware should *always* complete. The only reason it might not complete is if there were a hardware failure, or perhaps a system configuration error. Furthermore, if a timeout ever did occur, the IPA hardware would be in an indeterminate state, from which there is no recovery. It would require some sort of complete IPA reset, and would require the participation of the modem, and at this time there is no such sequence defined. So get rid of the definition of gsi_trans_commit_wait_timeout(), and update a few comments accordingly. Signed-off-by: Alex Elder --- drivers/net/ipa/gsi_trans.c | 22 ---------------------- drivers/net/ipa/gsi_trans.h | 9 --------- drivers/net/ipa/ipa_cmd.c | 15 +++++++-------- drivers/net/ipa/ipa_endpoint.c | 1 - 4 files changed, 7 insertions(+), 40 deletions(-) diff --git a/drivers/net/ipa/gsi_trans.c b/drivers/net/ipa/gsi_trans.c index 87e1d43c118c1..bf31ef3d56adc 100644 --- a/drivers/net/ipa/gsi_trans.c +++ b/drivers/net/ipa/gsi_trans.c @@ -637,28 +637,6 @@ void gsi_trans_commit_wait(struct gsi_trans *trans) gsi_trans_free(trans); } -/* Commit a GSI transaction and wait for it to complete, with timeout */ -int gsi_trans_commit_wait_timeout(struct gsi_trans *trans, - unsigned long timeout) -{ - unsigned long timeout_jiffies = msecs_to_jiffies(timeout); - unsigned long remaining = 1; /* In case of empty transaction */ - - if (!trans->used) - goto out_trans_free; - - refcount_inc(&trans->refcount); - - __gsi_trans_commit(trans, true); - - remaining = wait_for_completion_timeout(&trans->completion, - timeout_jiffies); -out_trans_free: - gsi_trans_free(trans); - - return remaining ? 0 : -ETIMEDOUT; -} - /* Process the completion of a transaction; called while polling */ void gsi_trans_complete(struct gsi_trans *trans) { diff --git a/drivers/net/ipa/gsi_trans.h b/drivers/net/ipa/gsi_trans.h index af379b49299ee..387ea50dd039e 100644 --- a/drivers/net/ipa/gsi_trans.h +++ b/drivers/net/ipa/gsi_trans.h @@ -205,15 +205,6 @@ void gsi_trans_commit(struct gsi_trans *trans, bool ring_db); */ void gsi_trans_commit_wait(struct gsi_trans *trans); -/** - * gsi_trans_commit_wait_timeout() - Commit a GSI transaction and wait for - * it to complete, with timeout - * @trans: Transaction to commit - * @timeout: Timeout period (in milliseconds) - */ -int gsi_trans_commit_wait_timeout(struct gsi_trans *trans, - unsigned long timeout); - /** * gsi_trans_read_byte() - Issue a single byte read TRE on a channel * @gsi: GSI pointer diff --git a/drivers/net/ipa/ipa_cmd.c b/drivers/net/ipa/ipa_cmd.c index d57472ea077f2..77b84cea6e68f 100644 --- a/drivers/net/ipa/ipa_cmd.c +++ b/drivers/net/ipa/ipa_cmd.c @@ -26,14 +26,13 @@ * other than data transfer to another endpoint. * * Immediate commands are represented by GSI transactions just like other - * transfer requests, represented by a single GSI TRE. Each immediate - * command has a well-defined format, having a payload of a known length. - * This allows the transfer element's length field to be used to hold an - * immediate command's opcode. The payload for a command resides in DRAM - * and is described by a single scatterlist entry in its transaction. - * Commands do not require a transaction completion callback. To commit - * an immediate command transaction, either gsi_trans_commit_wait() or - * gsi_trans_commit_wait_timeout() is used. + * transfer requests, and use a single GSI TRE. Each immediate command + * has a well-defined format, having a payload of a known length. This + * allows the transfer element's length field to be used to hold an + * immediate command's opcode. The payload for a command resides in AP + * memory and is described by a single scatterlist entry in its transaction. + * Commands do not require a transaction completion callback, and are + * (currently) always issued using gsi_trans_commit_wait(). */ /* Some commands can wait until indicated pipeline stages are clear */ diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c index 586529511cf6b..5ed5b8fd3ea36 100644 --- a/drivers/net/ipa/ipa_endpoint.c +++ b/drivers/net/ipa/ipa_endpoint.c @@ -478,7 +478,6 @@ int ipa_endpoint_modem_exception_reset_all(struct ipa *ipa) ipa_cmd_pipeline_clear_add(trans); - /* XXX This should have a 1 second timeout */ gsi_trans_commit_wait(trans); ipa_cmd_pipeline_clear_wait(ipa);