From patchwork Wed Aug 31 22:40:17 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alex Elder X-Patchwork-Id: 12961497 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 211CDECAAD4 for ; Wed, 31 Aug 2022 22:40:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232607AbiHaWkn (ORCPT ); Wed, 31 Aug 2022 18:40:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47102 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232602AbiHaWka (ORCPT ); Wed, 31 Aug 2022 18:40:30 -0400 Received: from mail-il1-x129.google.com (mail-il1-x129.google.com [IPv6:2607:f8b0:4864:20::129]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B4E258E0E5 for ; Wed, 31 Aug 2022 15:40:28 -0700 (PDT) Received: by mail-il1-x129.google.com with SMTP id s11so6856435ilt.7 for ; Wed, 31 Aug 2022 15:40:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date; bh=iA+ZsMRaFINLBa2q6rRWWDvmtN6jkG3m27+u4i2eWYk=; b=H+H0lsqEzdDcbzgUWISig1YUnIg/aehePSBnNojWIJj5QTRJWpJDhTDUIdVUWGmvrR frN9CtxPw+IA143oPez6mRWiKyGjGVU8bBjA3Wn59GA8d4910uqHdvCkbBQnEbv+xZZM i1k0g0/aGgThMCXoGwoX4NZk+tcIv6H3oZb4vEQDwwM8Qnk5RW4vNcNLUyhgp6exbeoU CYCd74UaJDUEw46FOi8MDuoBE6J+Edd3nx+kWSckyZhYh4HVYyQr6P5Ga6T1LDyCTHmD 1N50leIh8WybO3pC/EV1I+fwMyiKKLaOCP2og3t7ZdxRC32HCtZKfbOw1lVzzfp2IPPN TpcQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date; bh=iA+ZsMRaFINLBa2q6rRWWDvmtN6jkG3m27+u4i2eWYk=; b=TJntShDyXGMmmspVNw5N38IQXkwJlj1uDzoyyiysSf+OGDpbrGbP7L48jv0sjikvKG N5HVlT+AvEiQqKcqvxk6JfmaHC766Onv6TfqfiJW5Rm7S0tpf+gQNOxaNt8g+ZqjkpJq 6sLVvpKke5SVfUT00caNdmx/09hYU6KCKraK7ArFQNcOB6YnI7o+ti4QoSrlTrTgf3v0 0YT/nsr3CSgI64cVkCDeNnzOuKeOjlQwga+xbHYP09RjVN4Sg6ZZ55kl6UUC2RNlXtb0 vyiRVhz/atLKzMHKja6XD5j5m2OU8FTp8p/A9dgtqGfwbBhByxCylGdmv//Vtjsg3M4D 3EaA== X-Gm-Message-State: ACgBeo0YsDQ52Jo2CGCnfCqiTw4HsBZY5Eh0IQLLKsJBleZDKIH0Qdvo Y4QU2o3/7JF4wuD/xNDQN3xNAA== X-Google-Smtp-Source: AA6agR5x6getp83xkq0Tm4yf3gx4pL6enoWi1EqhzDjZt9MysZ1jzL7YI7dQgbx0LXwOTlUroLP0Ug== X-Received: by 2002:a92:8e09:0:b0:2eb:15a:c449 with SMTP id c9-20020a928e09000000b002eb015ac449mr8091188ild.162.1661985628119; Wed, 31 Aug 2022 15:40:28 -0700 (PDT) Received: from localhost.localdomain ([98.61.227.136]) by smtp.gmail.com with ESMTPSA id n30-20020a02a19e000000b0034c0db05629sm1392005jah.161.2022.08.31.15.40.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 31 Aug 2022 15:40:27 -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 6/6] net: ipa: track polled transactions with an ID Date: Wed, 31 Aug 2022 17:40:17 -0500 Message-Id: <20220831224017.377745-7-elder@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220831224017.377745-1-elder@linaro.org> References: <20220831224017.377745-1-elder@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Add a transaction ID to track the first element in the transaction array that has been polled. Advance the ID when we are releasing a transaction. Temporarily add warnings that verify that the first polled transaction tracked by the ID matches the first element on the polled list, both when polling and freeing. Remove the temporary warnings added by the previous commit. Signed-off-by: Alex Elder --- drivers/net/ipa/gsi.h | 1 + drivers/net/ipa/gsi_trans.c | 39 ++++++++++++++++++++++--------------- 2 files changed, 24 insertions(+), 16 deletions(-) diff --git a/drivers/net/ipa/gsi.h b/drivers/net/ipa/gsi.h index 987f9f5f35d36..13468704c4000 100644 --- a/drivers/net/ipa/gsi.h +++ b/drivers/net/ipa/gsi.h @@ -88,6 +88,7 @@ struct gsi_trans_info { u16 committed_id; /* first committed transaction */ u16 pending_id; /* first pending transaction */ u16 completed_id; /* first completed transaction */ + u16 polled_id; /* first polled transaction */ struct gsi_trans *trans; /* transaction array */ struct gsi_trans **map; /* TRE -> transaction map */ diff --git a/drivers/net/ipa/gsi_trans.c b/drivers/net/ipa/gsi_trans.c index 40852b1dd5b98..4eef1480c2005 100644 --- a/drivers/net/ipa/gsi_trans.c +++ b/drivers/net/ipa/gsi_trans.c @@ -296,19 +296,12 @@ void gsi_trans_move_complete(struct gsi_trans *trans) list_cut_position(&list, &trans_info->pending, &trans->links); list_splice_tail(&list, &trans_info->complete); - trans = list_first_entry(&trans_info->complete, - struct gsi_trans, links); - spin_unlock_bh(&trans_info->spinlock); /* These pending transactions are now completed */ delta = trans_index - trans_info->pending_id + 1; delta %= channel->tre_count; trans_info->pending_id += delta; - - WARN_ON(trans_info->completed_id == trans_info->pending_id); - trans_index = trans_info->completed_id % channel->tre_count; - WARN_ON(trans != &trans_info->trans[trans_index]); } /* Move a transaction from the completed list to the polled list */ @@ -322,21 +315,17 @@ void gsi_trans_move_polled(struct gsi_trans *trans) list_move_tail(&trans->links, &trans_info->polled); - trans = list_first_entry_or_null(&trans_info->complete, - struct gsi_trans, links); + trans = list_first_entry(&trans_info->polled, + struct gsi_trans, links); spin_unlock_bh(&trans_info->spinlock); /* This completed transaction is now polled */ trans_info->completed_id++; - if (trans) { - trans_index = trans_info->completed_id % channel->tre_count; - WARN_ON(trans != &trans_info->trans[trans_index]); - } else { - WARN_ON(trans_info->completed_id != - trans_info->pending_id); - } + WARN_ON(trans_info->polled_id == trans_info->completed_id); + trans_index = trans_info->polled_id % channel->tre_count; + WARN_ON(trans != &trans_info->trans[trans_index]); } /* Reserve some number of TREs on a channel. Returns true if successful */ @@ -424,8 +413,11 @@ struct gsi_trans *gsi_channel_trans_alloc(struct gsi *gsi, u32 channel_id, /* Free a previously-allocated transaction */ void gsi_trans_free(struct gsi_trans *trans) { + struct gsi_channel *channel = &trans->gsi->channel[trans->channel_id]; refcount_t *refcount = &trans->refcount; struct gsi_trans_info *trans_info; + struct gsi_trans *polled; + u16 trans_index; bool last; /* We must hold the lock to release the last reference */ @@ -441,6 +433,9 @@ void gsi_trans_free(struct gsi_trans *trans) if (last) list_del(&trans->links); + polled = list_first_entry_or_null(&trans_info->polled, + struct gsi_trans, links); + spin_unlock_bh(&trans_info->spinlock); if (!last) @@ -458,6 +453,17 @@ void gsi_trans_free(struct gsi_trans *trans) ipa_gsi_trans_release(trans); } + /* This transaction is now free */ + trans_info->polled_id++; + + if (polled) { + trans_index = trans_info->polled_id % channel->tre_count; + WARN_ON(polled != &trans_info->trans[trans_index]); + } else { + WARN_ON(trans_info->polled_id != + trans_info->completed_id); + } + /* Releasing the reserved TREs implicitly frees the sgl[] and * (if present) info[] arrays, plus the transaction itself. */ @@ -796,6 +802,7 @@ int gsi_channel_trans_init(struct gsi *gsi, u32 channel_id) trans_info->committed_id = 0; trans_info->pending_id = 0; trans_info->completed_id = 0; + trans_info->polled_id = 0; /* A completion event contains a pointer to the TRE that caused * the event (which will be the last one used by the transaction).