From patchwork Fri Jan 27 12:57:05 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?UmFmYcWCIE1pxYJlY2tp?= X-Patchwork-Id: 1732855 X-Patchwork-Delegate: trini@ti.com Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de (client-ip=2a01:238:438b:c500:173d:9f52:ddab:ee01; helo=phobos.denx.de; envelope-from=u-boot-bounces@lists.denx.de; receiver=) Authentication-Results: legolas.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20210112 header.b=IPo67SYQ; dkim-atps=neutral Received: from phobos.denx.de (phobos.denx.de [IPv6:2a01:238:438b:c500:173d:9f52:ddab:ee01]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-384)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4P3HgY023Sz23hm for ; Fri, 27 Jan 2023 23:58:16 +1100 (AEDT) Received: from h2850616.stratoserver.net (localhost [IPv6:::1]) by phobos.denx.de (Postfix) with ESMTP id 3E50C856AF; Fri, 27 Jan 2023 13:58:00 +0100 (CET) Authentication-Results: phobos.denx.de; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de Authentication-Results: phobos.denx.de; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="IPo67SYQ"; dkim-atps=neutral Received: by phobos.denx.de (Postfix, from userid 109) id 86653856E5; Fri, 27 Jan 2023 13:57:24 +0100 (CET) X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on phobos.denx.de X-Spam-Level: X-Spam-Status: No, score=-1.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_ENVFROM_END_DIGIT, FREEMAIL_FROM,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.2 Received: from mail-ed1-x52a.google.com (mail-ed1-x52a.google.com [IPv6:2a00:1450:4864:20::52a]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits)) (No client certificate requested) by phobos.denx.de (Postfix) with ESMTPS id AC54B854C7 for ; Fri, 27 Jan 2023 13:57:20 +0100 (CET) Authentication-Results: phobos.denx.de; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=zajec5@gmail.com Received: by mail-ed1-x52a.google.com with SMTP id n6so2009158edo.9 for ; Fri, 27 Jan 2023 04:57:20 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=CEAkJYnxqrZMOhdPjkEBTuVRB27vVAzsdoVajeGwdl8=; b=IPo67SYQlof0606s8wMwkmMpL/q0CXu3HyeKevsPA+c+dLT+aacZA70ccJyyJPXKHa JyVuSpAun8AGzuLGmIE1Az6ZKxT6zSb5QuMCdwtPlhZIuBj94hvgKpExZvP2zLeWd4QL dmFGB1uKDmK9IGCiKHS86D8mA1xHn8hKtO7Wu8pTE1SZsLpoc2aKy3VhNuMauJVaeJVt W/rCXahEbFLLQZ+AtziBCgl5XZOXu7WWGjk/scynd/HdrTkHLHUugmZcaGnCoiTHW6/6 rLJV4jR7n0ONzD4vLSfKtApgGqBn8SicP1Pi+ii7qTp+QcUlENMCymZ4hyR2tYL+31X2 9tcA== 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:message-id:reply-to; bh=CEAkJYnxqrZMOhdPjkEBTuVRB27vVAzsdoVajeGwdl8=; b=y5YZ2eIDoukYYrZe2h8eflXI+c3fM4mygxApBc8obbSkAel3zgOf8/Ojt9bhU+A7az wN6xuzR/nCmwsyxSHFhph8uy+C1Ak2bXsN498Vg20ULWywzzL+RvtKqcIiqYc/7b+wW/ 6UgurSkSwziWeBwh/O9uzx4yOEVx0xkwGbCerhqsdBO8ZXtkbbSpp/TGJMinfLiiBf0A 2OmhZHAnCZbZVssmJgDzhn9acqOjVVQ+gkdShcTA/+McAJGrtUdEiiXPFHs+cNtru32R tVYqhYgP2CLrzJdPudpcOohsPYAoW/QHyJXv2pyGaSq+YqLmIvLiW1deoRM8HFdUb+FS geSw== X-Gm-Message-State: AFqh2kpo9FqBlx35yIT2YKNYsWHYhPxBviOCYqY4b/T/Y/1BLpDLhtbp xlJMlAz4bn3N6E8tZOgsKis= X-Google-Smtp-Source: AMrXdXv1VGvpGnLHajmv7FN4PDBZj7ATbtCd+SBuuqResrWCvlqMmRgrewKY9buZwbBdhoSSNZKIPQ== X-Received: by 2002:a05:6402:3909:b0:499:bcd7:a968 with SMTP id fe9-20020a056402390900b00499bcd7a968mr43322323edb.22.1674824240299; Fri, 27 Jan 2023 04:57:20 -0800 (PST) Received: from localhost.lan (ip-194-187-74-233.konfederacka.maverick.com.pl. [194.187.74.233]) by smtp.gmail.com with ESMTPSA id y5-20020a056402358500b00482e0c55e2bsm2248136edc.93.2023.01.27.04.57.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 Jan 2023 04:57:19 -0800 (PST) From: =?utf-8?b?UmFmYcWCIE1pxYJlY2tp?= To: Srinivas Kandagatla , Rob Herring , Krzysztof Kozlowski Cc: Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Miquel Raynal , Michael Walle , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, u-boot@lists.denx.de, =?utf-8?b?UmFmYcWCIE1p?= =?utf-8?b?xYJlY2tp?= Subject: [PATCH V3 2/6] nvmem: core: allow .read_post_process() callbacks to adjust buffer Date: Fri, 27 Jan 2023 13:57:05 +0100 Message-Id: <20230127125709.32191-2-zajec5@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230127125709.32191-1-zajec5@gmail.com> References: <20230127125709.32191-1-zajec5@gmail.com> MIME-Version: 1.0 X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.39 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" X-Virus-Scanned: clamav-milter 0.103.6 at phobos.denx.de X-Virus-Status: Clean From: Rafał Miłecki Sometimes reading NVMEM cell value involves some data reformatting. it may require resizing available buffer. Support that. It's required e.g. to provide properly formatted MAC address in case it's stored in a non-binary format (e.g. using ASCII). Signed-off-by: Rafał Miłecki --- V2: Pass buffer pointer to allow krealloc() if needed V3: Don't move unnecessarily code setting *len --- drivers/nvmem/core.c | 21 +++++++++++++-------- drivers/nvmem/imx-ocotp.c | 8 ++++---- drivers/nvmem/layouts/onie-tlv.c | 5 ++--- drivers/nvmem/layouts/sl28vpd.c | 10 +++++----- include/linux/nvmem-provider.h | 5 ++--- 5 files changed, 26 insertions(+), 23 deletions(-) diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c index 9e77af0164aa..162054a39fa1 100644 --- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -1540,28 +1540,29 @@ static void nvmem_shift_read_buffer_in_place(struct nvmem_cell_entry *cell, void static int __nvmem_cell_read(struct nvmem_device *nvmem, struct nvmem_cell_entry *cell, - void *buf, size_t *len, const char *id, int index) + void **buf, size_t *len, const char *id, int index) { + size_t bytes = cell->bytes; int rc; - rc = nvmem_reg_read(nvmem, cell->offset, buf, cell->bytes); + rc = nvmem_reg_read(nvmem, cell->offset, *buf, bytes); if (rc) return rc; /* shift bits in-place */ if (cell->bit_offset || cell->nbits) - nvmem_shift_read_buffer_in_place(cell, buf); + nvmem_shift_read_buffer_in_place(cell, *buf); if (cell->read_post_process) { rc = cell->read_post_process(cell->priv, id, index, - cell->offset, buf, cell->bytes); + cell->offset, buf, &bytes); if (rc) return rc; } if (len) - *len = cell->bytes; + *len = bytes; return 0; } @@ -1579,7 +1580,7 @@ static int __nvmem_cell_read(struct nvmem_device *nvmem, void *nvmem_cell_read(struct nvmem_cell *cell, size_t *len) { struct nvmem_device *nvmem = cell->entry->nvmem; - u8 *buf; + void *buf; int rc; if (!nvmem) @@ -1589,7 +1590,7 @@ void *nvmem_cell_read(struct nvmem_cell *cell, size_t *len) if (!buf) return ERR_PTR(-ENOMEM); - rc = __nvmem_cell_read(nvmem, cell->entry, buf, len, cell->id, cell->index); + rc = __nvmem_cell_read(nvmem, cell->entry, &buf, len, cell->id, cell->index); if (rc) { kfree(buf); return ERR_PTR(rc); @@ -1906,11 +1907,15 @@ ssize_t nvmem_device_cell_read(struct nvmem_device *nvmem, if (!nvmem) return -EINVAL; + /* Cells with read_post_process hook may realloc buffer we can't allow here */ + if (info->read_post_process) + return -EINVAL; + rc = nvmem_cell_info_to_nvmem_cell_entry_nodup(nvmem, info, &cell); if (rc) return rc; - rc = __nvmem_cell_read(nvmem, &cell, buf, &len, NULL, 0); + rc = __nvmem_cell_read(nvmem, &cell, &buf, &len, NULL, 0); if (rc) return rc; diff --git a/drivers/nvmem/imx-ocotp.c b/drivers/nvmem/imx-ocotp.c index ac0edb6398f1..e17500bc0acc 100644 --- a/drivers/nvmem/imx-ocotp.c +++ b/drivers/nvmem/imx-ocotp.c @@ -223,15 +223,15 @@ static int imx_ocotp_read(void *context, unsigned int offset, } static int imx_ocotp_cell_pp(void *context, const char *id, int index, - unsigned int offset, void *data, size_t bytes) + unsigned int offset, void **data, size_t *bytes) { - u8 *buf = data; + u8 *buf = *data; int i; /* Deal with some post processing of nvmem cell data */ if (id && !strcmp(id, "mac-address")) - for (i = 0; i < bytes / 2; i++) - swap(buf[i], buf[bytes - i - 1]); + for (i = 0; i < *bytes / 2; i++) + swap(buf[i], buf[*bytes - i - 1]); return 0; } diff --git a/drivers/nvmem/layouts/onie-tlv.c b/drivers/nvmem/layouts/onie-tlv.c index 767f39fff717..f26bcce2a44d 100644 --- a/drivers/nvmem/layouts/onie-tlv.c +++ b/drivers/nvmem/layouts/onie-tlv.c @@ -75,10 +75,9 @@ static const char *onie_tlv_cell_name(u8 type) } static int onie_tlv_mac_read_cb(void *priv, const char *id, int index, - unsigned int offset, void *buf, - size_t bytes) + unsigned int offset, void **buf, size_t *bytes) { - eth_addr_add(buf, index); + eth_addr_add(*buf, index); return 0; } diff --git a/drivers/nvmem/layouts/sl28vpd.c b/drivers/nvmem/layouts/sl28vpd.c index a36800f201a3..869cb513d79a 100644 --- a/drivers/nvmem/layouts/sl28vpd.c +++ b/drivers/nvmem/layouts/sl28vpd.c @@ -22,19 +22,19 @@ struct sl28vpd_v1 { } __packed; static int sl28vpd_mac_address_pp(void *priv, const char *id, int index, - unsigned int offset, void *buf, - size_t bytes) + unsigned int offset, void **buf, + size_t *bytes) { - if (bytes != ETH_ALEN) + if (*bytes != ETH_ALEN) return -EINVAL; if (index < 0) return -EINVAL; - if (!is_valid_ether_addr(buf)) + if (!is_valid_ether_addr(*buf)) return -EINVAL; - eth_addr_add(buf, index); + eth_addr_add(*buf, index); return 0; } diff --git a/include/linux/nvmem-provider.h b/include/linux/nvmem-provider.h index 0cf9f9490514..e70766013f97 100644 --- a/include/linux/nvmem-provider.h +++ b/include/linux/nvmem-provider.h @@ -19,9 +19,8 @@ typedef int (*nvmem_reg_read_t)(void *priv, unsigned int offset, typedef int (*nvmem_reg_write_t)(void *priv, unsigned int offset, void *val, size_t bytes); /* used for vendor specific post processing of cell data */ -typedef int (*nvmem_cell_post_process_t)(void *priv, const char *id, int index, - unsigned int offset, void *buf, - size_t bytes); +typedef int (*nvmem_cell_post_process_t)(void *priv, const char *id, int index, unsigned int offset, + void **buf, size_t *bytes); enum nvmem_type { NVMEM_TYPE_UNKNOWN = 0,