From patchwork Fri Sep 10 06:22:06 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Heiner Kallweit X-Patchwork-Id: 509094 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=-14.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=unavailable 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 C01D0C433EF for ; Fri, 10 Sep 2021 06:28:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9E5E3610C9 for ; Fri, 10 Sep 2021 06:28:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231171AbhIJG3T (ORCPT ); Fri, 10 Sep 2021 02:29:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34408 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230467AbhIJG3S (ORCPT ); Fri, 10 Sep 2021 02:29:18 -0400 Received: from mail-wr1-x430.google.com (mail-wr1-x430.google.com [IPv6:2a00:1450:4864:20::430]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A6459C061574; Thu, 9 Sep 2021 23:28:07 -0700 (PDT) Received: by mail-wr1-x430.google.com with SMTP id t18so1083673wrb.0; Thu, 09 Sep 2021 23:28:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=subject:from:to:cc:references:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=JWf4yF5KquCSwG+63OJJa1U7ntFDUJfhUzH00QrGcfU=; b=YizobErLJdrH7022UAiQyOvkewG4HyS05ecVD8IwQz9OKvhrnbbvspIKSol5R6YYTK IYksQn+SY1DxYpLVNMYEwb4/9qWggQUqbWntNstG1kjp149XU1dYOGb4cYOGh7FRQ7+O vrfWvhYQSPcOFfEFDuQWEcQ//++3DyIFkTA99cDx1YP0yiErSPJwRHaQl0BLU30kArNW O15zfhItll1+GjMLz8EI2JOEYPnAJRPFdVPHsUkREUCwTq8DEd9N8GvdIg/kpryP8ot/ d60VEeIY2H5soUz/2AX0EqU09tqQmUHggOXumaRW1ccR5ngKy1JxrkW1zmktxTEA3l68 Il7A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:subject:from:to:cc:references:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=JWf4yF5KquCSwG+63OJJa1U7ntFDUJfhUzH00QrGcfU=; b=7bzcJlhkoRi5nF0/1F9eJsnD+ENMCymQxYTJHtXb3Us9KewWjCTjO6L06m3TBSfNMv PeuYbjF22np6xL7WLxKUpmrvvjoHoVPtnkh15rcpLEapnVyrzv0DygesjKbem5THsNJa TD2Pp2u6DvEqoOSgmAAjXIGJrCxfHZT2b2B7VSr7fP85GIpHrOVxuGgEakcRY7yFiHC/ PnxwTLvd36/dDQ7UvFpBG0IMuRUV1HFNuEF9NtqON1TT9g6lRFUqPWAbKF6Mw1IqEdvA N5DwQZa9gohtdLDnN45CEsBzU6IVKSdmFPc2Etur7GWZ9xl1cJxRSmWgLa6/z1wLH2A1 B4vA== X-Gm-Message-State: AOAM5326vurtrWPlQOU/ENHBLy987kc4pHQSPDnuOWeNwRfG33+bV+P4 4xA69seP7PKqOoIIz7XTLzucBlDAnAU= X-Google-Smtp-Source: ABdhPJysvk/ywMehS9Iujv5cudSBURB3fGf4P63th6jMzOJuBM9XVWhdRjC0I+cjPDSteQClzUfwGw== X-Received: by 2002:adf:ecc6:: with SMTP id s6mr494360wro.361.1631255285655; Thu, 09 Sep 2021 23:28:05 -0700 (PDT) Received: from ?IPv6:2003:ea:8f08:4500:c9c:396a:4a57:ee58? (p200300ea8f0845000c9c396a4a57ee58.dip0.t-ipconnect.de. [2003:ea:8f08:4500:c9c:396a:4a57:ee58]) by smtp.googlemail.com with ESMTPSA id m29sm3875515wrb.89.2021.09.09.23.28.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 09 Sep 2021 23:28:05 -0700 (PDT) Subject: [PATCH 1/5] PCI/VPD: Add pci_read/write_vpd_any() From: Heiner Kallweit To: Bjorn Helgaas , Jakub Kicinski , David Miller , Raju Rangoju Cc: "linux-pci@vger.kernel.org" , "netdev@vger.kernel.org" References: Message-ID: <93ecce28-a158-f02a-d134-8afcaced8efe@gmail.com> Date: Fri, 10 Sep 2021 08:22:06 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org In certain cases we need a variant of pci_read_vpd()/pci_write_vpd() that does not check against dev->vpd.len. Such cases are: - reading VPD if dev->vpd.len isn't set yet (in pci_vpd_size()) - devices that map non-VPD information to arbitrary places in VPD address space (example: Chelsio T3 EEPROM write-protect flag) Therefore add function variants that check against PCI_VPD_MAX_SIZE only. Signed-off-by: Heiner Kallweit --- drivers/pci/vpd.c | 72 +++++++++++++++++++++++++++++++-------------- include/linux/pci.h | 2 ++ 2 files changed, 52 insertions(+), 22 deletions(-) diff --git a/drivers/pci/vpd.c b/drivers/pci/vpd.c index 25557b272..286cad2a6 100644 --- a/drivers/pci/vpd.c +++ b/drivers/pci/vpd.c @@ -138,9 +138,10 @@ static int pci_vpd_wait(struct pci_dev *dev, bool set) } static ssize_t pci_vpd_read(struct pci_dev *dev, loff_t pos, size_t count, - void *arg) + void *arg, bool check_size) { struct pci_vpd *vpd = &dev->vpd; + unsigned int max_len = check_size ? vpd->len : PCI_VPD_MAX_SIZE; int ret = 0; loff_t end = pos + count; u8 *buf = arg; @@ -151,11 +152,11 @@ static ssize_t pci_vpd_read(struct pci_dev *dev, loff_t pos, size_t count, if (pos < 0) return -EINVAL; - if (pos > vpd->len) + if (pos >= max_len) return 0; - if (end > vpd->len) { - end = vpd->len; + if (end > max_len) { + end = max_len; count = end - pos; } @@ -199,9 +200,10 @@ static ssize_t pci_vpd_read(struct pci_dev *dev, loff_t pos, size_t count, } static ssize_t pci_vpd_write(struct pci_dev *dev, loff_t pos, size_t count, - const void *arg) + const void *arg, bool check_size) { struct pci_vpd *vpd = &dev->vpd; + unsigned int max_len = check_size ? vpd->len : PCI_VPD_MAX_SIZE; const u8 *buf = arg; loff_t end = pos + count; int ret = 0; @@ -212,7 +214,7 @@ static ssize_t pci_vpd_write(struct pci_dev *dev, loff_t pos, size_t count, if (pos < 0 || (pos & 3) || (count & 3)) return -EINVAL; - if (end > vpd->len) + if (end > max_len) return -EINVAL; if (mutex_lock_killable(&vpd->lock)) @@ -365,6 +367,24 @@ static int pci_vpd_find_info_keyword(const u8 *buf, unsigned int off, return -ENOENT; } +static ssize_t __pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf, + bool check_size) +{ + ssize_t ret; + + if (dev->dev_flags & PCI_DEV_FLAGS_VPD_REF_F0) { + dev = pci_get_func0_dev(dev); + if (!dev) + return -ENODEV; + + ret = pci_vpd_read(dev, pos, count, buf, check_size); + pci_dev_put(dev); + return ret; + } + + return pci_vpd_read(dev, pos, count, buf, check_size); +} + /** * pci_read_vpd - Read one entry from Vital Product Data * @dev: PCI device struct @@ -373,6 +393,20 @@ static int pci_vpd_find_info_keyword(const u8 *buf, unsigned int off, * @buf: pointer to where to store result */ ssize_t pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf) +{ + return __pci_read_vpd(dev, pos, count, buf, true); +} +EXPORT_SYMBOL(pci_read_vpd); + +/* Same, but allow to access any address */ +ssize_t pci_read_vpd_any(struct pci_dev *dev, loff_t pos, size_t count, void *buf) +{ + return __pci_read_vpd(dev, pos, count, buf, false); +} +EXPORT_SYMBOL(pci_read_vpd_any); + +static ssize_t __pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count, + const void *buf, bool check_size) { ssize_t ret; @@ -381,14 +415,13 @@ ssize_t pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf) if (!dev) return -ENODEV; - ret = pci_vpd_read(dev, pos, count, buf); + ret = pci_vpd_write(dev, pos, count, buf, check_size); pci_dev_put(dev); return ret; } - return pci_vpd_read(dev, pos, count, buf); + return pci_vpd_write(dev, pos, count, buf, check_size); } -EXPORT_SYMBOL(pci_read_vpd); /** * pci_write_vpd - Write entry to Vital Product Data @@ -399,22 +432,17 @@ EXPORT_SYMBOL(pci_read_vpd); */ ssize_t pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count, const void *buf) { - ssize_t ret; - - if (dev->dev_flags & PCI_DEV_FLAGS_VPD_REF_F0) { - dev = pci_get_func0_dev(dev); - if (!dev) - return -ENODEV; - - ret = pci_vpd_write(dev, pos, count, buf); - pci_dev_put(dev); - return ret; - } - - return pci_vpd_write(dev, pos, count, buf); + return __pci_write_vpd(dev, pos, count, buf, true); } EXPORT_SYMBOL(pci_write_vpd); +/* Same, but allow to access any address */ +ssize_t pci_write_vpd_any(struct pci_dev *dev, loff_t pos, size_t count, const void *buf) +{ + return __pci_write_vpd(dev, pos, count, buf, false); +} +EXPORT_SYMBOL(pci_write_vpd_any); + int pci_vpd_find_ro_info_keyword(const void *buf, unsigned int len, const char *kw, unsigned int *size) { diff --git a/include/linux/pci.h b/include/linux/pci.h index cd8aa6fce..9649bd9e4 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1350,6 +1350,8 @@ void pci_unlock_rescan_remove(void); /* Vital Product Data routines */ ssize_t pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf); ssize_t pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count, const void *buf); +ssize_t pci_read_vpd_any(struct pci_dev *dev, loff_t pos, size_t count, void *buf); +ssize_t pci_write_vpd_any(struct pci_dev *dev, loff_t pos, size_t count, const void *buf); /* Helper functions for low-level code (drivers/pci/setup-[bus,res].c) */ resource_size_t pcibios_retrieve_fw_addr(struct pci_dev *dev, int idx);