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Mon, 26 Apr 2021 10:56:02 -0700 (PDT) From: Neil Armstrong To: ulf.hansson@linaro.org, khilman@baylibre.com Cc: linux-mmc@vger.kernel.org, linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Neil Armstrong , Christian Hewitt Subject: [PATCH 1/2] mmc: meson-gx: make replace WARN_ONCE with dev_warn_once about scatterlist offset alignment Date: Mon, 26 Apr 2021 19:55:58 +0200 Message-Id: <20210426175559.3110575-1-narmstrong@baylibre.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Patch-Hashes: v=1; h=sha256; i=D4BnzQN4yovLOupJGSNrbWTUPYCcxuBJZXJ1F8kaNeI=; m=ygoCLhKf/v/HVpjA/Pa8YJvQeeXyjQkv6fyzRtAwrHw=; p=XuOMdYKhwBPfihg5inLCFiEtpgUiSKXZkxwW0eW2eX0=; g=dafaad0776a887f410e5d3ec6e08cf89118507a5 X-Patch-Sig: m=pgp; i=narmstrong@baylibre.com; s=0xA4CFF8AE; b=iQIzBAABCgAdFiEEPVPGJshWBf4d9CyLd9zb2sjISdEFAmCG/pEACgkQd9zb2sjISdENlBAAgUb Vjq5e1kby6MqtJS5HtnydgaMwvUs/tVSnyZGjwrspH/tuRQo6VtgxCDgW7bG5W2Gp3pnXauXLIzer jXQoBjFRLNt5rtwRg0bZPnBVIkt+8eXUtO57on+PrNCY3K04QL5A9iWYavQGEzWo+fTXzHwU7Kuwa QNNojZU8fL7umEGvgeI/AhIu4/gmYtpQ2EMnumkvoXM/UNBua/bMQb3gDXlHbfsiIhsDA0et/Z/QB OyPpiJnncBU1CvXxQ0g/3bqtZo40MvNb4Gmc1IxSM0cxUS97BLk38nnBFlSF59T7k1iUTAkSjDLLo f44Gmrf79q0nJR4aTbNVuCqeQuU8pWF9xnOn1cuM5aij7tphWCWR6IMxru9VJsptExir7P8cHD6sN noZL8hhK/wUF2lq5jYwTZGQLejK/nP7G40ZyfJTy+lkotMlwd3+PDT69az3no+qweFQu3PQvDJbSW IMXO+V+9OvVXCYKYmgY5Aqyr1rt7sevV6ziOpGb6oQceqBuPDRA41NQdmARoXec1x/k0qTqCykmN6 G+dsLxrbs97zTDf1snjcKBaZPjFUqtaJ4EgqmJ7V3EHvzmyGfpeJJppigVbbDbWq9Y3vRwDepFzf9 C8Sxu3hz0Hmy7CDTDHR/zsRR7L2VgOmvbKg6v7I8cNkT1Jpl4dEdci/x2/2xuDLE= X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210426_185804_599650_DD1B1CB3 X-CRM114-Status: GOOD ( 13.60 ) 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 Some drivers like ath10k can sometimg give an sg buffer with an offset whose alignment is not compatible with the Amlogic DMA descriptor engine requirements. Simply replace with dev_warn_once() to inform user this should be fixed to avoid degraded performance. This should be ultimately fixed in ath10k, but since it's only a performance issue the warning should be removed. Fixes: 79ed05e329c3 ("mmc: meson-gx: add support for descriptor chain mode") Reported-by: Christian Hewitt Signed-off-by: Neil Armstrong Acked-by: Martin Blumenstingl --- drivers/mmc/host/meson-gx-mmc.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c index b8b771b643cc..1c61f0f24c09 100644 --- a/drivers/mmc/host/meson-gx-mmc.c +++ b/drivers/mmc/host/meson-gx-mmc.c @@ -258,7 +258,9 @@ static void meson_mmc_get_transfer_mode(struct mmc_host *mmc, for_each_sg(data->sg, sg, data->sg_len, i) { /* check for 8 byte alignment */ if (sg->offset % 8) { - WARN_ONCE(1, "unaligned scatterlist buffer\n"); + dev_warn_once(mmc_dev(mmc), + "unaligned sg offset %u, disabling descriptor DMA for transfer\n", + sg->offset); return; } } From patchwork Mon Apr 26 17:55:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Neil Armstrong X-Patchwork-Id: 12224833 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=-17.0 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,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 6E916C433B4 for ; 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Mon, 26 Apr 2021 10:56:04 -0700 (PDT) Received: from localhost.localdomain ([2a01:e0a:90c:e290:b76e:7362:77c0:ddc3]) by smtp.gmail.com with ESMTPSA id l5sm18001806wmh.0.2021.04.26.10.56.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 26 Apr 2021 10:56:04 -0700 (PDT) From: Neil Armstrong To: ulf.hansson@linaro.org, khilman@baylibre.com Cc: linux-mmc@vger.kernel.org, linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Neil Armstrong , Christian Hewitt Subject: [PATCH 2/2] mmc: meson-gx: also check SD_IO_RW_EXTENDED for scatterlist size alignment Date: Mon, 26 Apr 2021 19:55:59 +0200 Message-Id: <20210426175559.3110575-2-narmstrong@baylibre.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210426175559.3110575-1-narmstrong@baylibre.com> References: <20210426175559.3110575-1-narmstrong@baylibre.com> MIME-Version: 1.0 X-Patch-Hashes: v=1; h=sha256; i=0iE1gydo5IoVoHEdTGhZZiatpUhZ9Z5MLK2Vn7+Gc1o=; m=v0oQgZ0JKMrLqEjNdBsLtL6pDaOlXk58P1dmCAEdj/4=; 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This is not supported by the Amlogic Descriptor dma engine where each descriptor must match a multiple of the block size. The sg list is valid, since the sum of the sg buffers is a multiple of the block size, but we must discard those when in SD_IO_RW_EXTENDED mode since SDIO block mode can be used under the hood even with data->blocks == 1. Those transfers are very rare, thus can be replaced by a bounce buffer without real performance loss. Fixes: 7412dee9f1fd ("mmc: meson-gx: replace WARN_ONCE with dev_warn_once about scatterlist size alignment in block mode") Reported-by: Christian Hewitt Signed-off-by: Neil Armstrong --- drivers/mmc/host/meson-gx-mmc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c index 1c61f0f24c09..016a6106151a 100644 --- a/drivers/mmc/host/meson-gx-mmc.c +++ b/drivers/mmc/host/meson-gx-mmc.c @@ -236,7 +236,8 @@ static void meson_mmc_get_transfer_mode(struct mmc_host *mmc, if (host->dram_access_quirk) return; - if (data->blocks > 1) { + /* SD_IO_RW_EXTENDED (CMD53) can also use block mode under the hood */ + if (data->blocks > 1 || mrq->cmd->opcode == SD_IO_RW_EXTENDED) { /* * In block mode DMA descriptor format, "length" field indicates * number of blocks and there is no way to pass DMA size that