From patchwork Fri Feb 19 14:25:13 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Jeffery X-Patchwork-Id: 1442221 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=aj.id.au header.i=@aj.id.au header.a=rsa-sha256 header.s=fm2 header.b=L+cJhKoN; dkim=pass (2048-bit key; unprotected) header.d=messagingengine.com header.i=@messagingengine.com header.a=rsa-sha256 header.s=fm2 header.b=Qeq9gs9R; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4Dhv8p0NQ6z9sVR for ; Sat, 20 Feb 2021 01:29:14 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231142AbhBSO2a (ORCPT ); Fri, 19 Feb 2021 09:28:30 -0500 Received: from new3-smtp.messagingengine.com ([66.111.4.229]:59443 "EHLO new3-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230513AbhBSO2I (ORCPT ); Fri, 19 Feb 2021 09:28:08 -0500 Received: from compute3.internal (compute3.nyi.internal [10.202.2.43]) by mailnew.nyi.internal (Postfix) with ESMTP id E51245803AA; Fri, 19 Feb 2021 09:26:45 -0500 (EST) Received: from mailfrontend1 ([10.202.2.162]) by compute3.internal (MEProxy); Fri, 19 Feb 2021 09:26:45 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=aj.id.au; h=from :to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; s=fm2; bh=tgPzT8KANlt6b tnmwq4Jhv0nW8WKZxHI0W8K9l9oRQI=; b=L+cJhKoNTicVe/5mtdySxPKqm+DHd MWGX2qPO42e74fUm1BFJLL5AJOsH1Iu6/EI77sy/dZEOd7Ao+m/oo4EXH5pAuTcl K+oy4YA0C9l6lKgWiaQi2sk2bsyUoxuzfubWUXraSj7gklpKNvx/JQFop0UxmWzh ez3Ble0Sah+zvwga5T9+zN0BJqd+7vC8JnCS+qaCDUwErC57xlkSIjES7vPjlhzG eGQTbO5V7qKAFxp2S9TuskJ2dmHaoHNhW9HeGoyOmbzZ9tuAyZndh67qwsxkBEDK /hnJBiSWEBHSWrs0kHxSnG7LDmxfZemu79swVNo9J/XwS0wMndPZvxX5w== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-transfer-encoding:date:from :in-reply-to:message-id:mime-version:references:subject:to :x-me-proxy:x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s= fm2; bh=tgPzT8KANlt6btnmwq4Jhv0nW8WKZxHI0W8K9l9oRQI=; b=Qeq9gs9R eDJdpdz2trQc0kmOeeQTU+K3nzqw+Jgj6v/Ov0RGATB4tuc95fHpiEMvLGPe9GK2 irnepiQTzpB4xvHbq5xd5CB83R3FK7+06NwgUm4oOvrYiXNB2SG9oIiVe5avBPVA 7B4Klt7kXWGlc++t5P+qlHKUgpqpOnZWk+egNBNg+ayj8vndcA3iuLJJjhqBHPON dDPakRMR/ND2qNfSRTeZCNYhc4qnrPnggG7RXBxg/4oWYU0huOWS4xY6KEmvsLIw T3ZYLvBOKWkJg2PX9t9dU7/1uobHvJFPJ9dwlWSwI2iii7H/q/43BLr+wEGB1CFx 0aNLDPD7bR9g+Q== X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeduledrjeeigdeigecutefuodetggdotefrodftvf curfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfghnecu uegrihhlohhuthemuceftddtnecunecujfgurhephffvufffkffojghfggfgsedtkeertd ertddtnecuhfhrohhmpeetnhgurhgvficulfgvfhhfvghrhicuoegrnhgurhgvfiesrghj rdhiugdrrghuqeenucggtffrrghtthgvrhhnpeejgfdvveehteekveeggeellefgleette ejffelffdvudduveeiffegteelvefhteenucfkphepudegrddvrdeluddrfeejnecuvehl uhhsthgvrhfuihiivgepheenucfrrghrrghmpehmrghilhhfrhhomheprghnughrvgifse grjhdrihgurdgruh X-ME-Proxy: Received: from localhost.localdomain (ppp14-2-91-37.adl-apt-pir-bras31.tpg.internode.on.net [14.2.91.37]) by mail.messagingengine.com (Postfix) with ESMTPA id E53BD240062; Fri, 19 Feb 2021 09:26:38 -0500 (EST) From: Andrew Jeffery To: openipmi-developer@lists.sourceforge.net, openbmc@lists.ozlabs.org, minyard@acm.org Cc: robh+dt@kernel.org, joel@jms.id.au, lee.jones@linaro.org, avifishman70@gmail.com, tmaimon77@gmail.com, tali.perry1@gmail.com, venture@google.com, yuenn@google.com, benjaminfair@google.com, linus.walleij@linaro.org, chiawei_wang@aspeedtech.com, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-aspeed@lists.ozlabs.org, linux-gpio@vger.kernel.org Subject: [PATCH 09/19] ipmi: kcs_bmc: Split out kcs_bmc_cdev_ipmi Date: Sat, 20 Feb 2021 00:55:13 +1030 Message-Id: <20210219142523.3464540-10-andrew@aj.id.au> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210219142523.3464540-1-andrew@aj.id.au> References: <20210219142523.3464540-1-andrew@aj.id.au> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Take steps towards defining a coherent API to separate the KCS device drivers from the userspace interface. Decreasing the coupling will improve the separation of concerns and enable the introduction of alternative userspace interfaces. For now, simply split the chardev logic out to a separate file. The code continues to build into the same module. Signed-off-by: Andrew Jeffery --- drivers/char/ipmi/Makefile | 2 +- drivers/char/ipmi/kcs_bmc.c | 423 +------------------------ drivers/char/ipmi/kcs_bmc.h | 10 +- drivers/char/ipmi/kcs_bmc_cdev_ipmi.c | 426 ++++++++++++++++++++++++++ 4 files changed, 449 insertions(+), 412 deletions(-) create mode 100644 drivers/char/ipmi/kcs_bmc_cdev_ipmi.c diff --git a/drivers/char/ipmi/Makefile b/drivers/char/ipmi/Makefile index 0822adc2ec41..a302bc865370 100644 --- a/drivers/char/ipmi/Makefile +++ b/drivers/char/ipmi/Makefile @@ -22,7 +22,7 @@ obj-$(CONFIG_IPMI_SSIF) += ipmi_ssif.o obj-$(CONFIG_IPMI_POWERNV) += ipmi_powernv.o obj-$(CONFIG_IPMI_WATCHDOG) += ipmi_watchdog.o obj-$(CONFIG_IPMI_POWEROFF) += ipmi_poweroff.o -obj-$(CONFIG_IPMI_KCS_BMC) += kcs_bmc.o +obj-$(CONFIG_IPMI_KCS_BMC) += kcs_bmc.o kcs_bmc_cdev_ipmi.o obj-$(CONFIG_ASPEED_BT_IPMI_BMC) += bt-bmc.o obj-$(CONFIG_ASPEED_KCS_IPMI_BMC) += kcs_bmc_aspeed.o obj-$(CONFIG_NPCM7XX_KCS_IPMI_BMC) += kcs_bmc_npcm7xx.o diff --git a/drivers/char/ipmi/kcs_bmc.c b/drivers/char/ipmi/kcs_bmc.c index c4336c1f2d6d..ef5c48ffe74a 100644 --- a/drivers/char/ipmi/kcs_bmc.c +++ b/drivers/char/ipmi/kcs_bmc.c @@ -3,446 +3,51 @@ * Copyright (c) 2015-2018, Intel Corporation. */ -#define pr_fmt(fmt) "kcs-bmc: " fmt - -#include -#include -#include #include -#include -#include -#include -#include #include "kcs_bmc.h" -#define DEVICE_NAME "ipmi-kcs" - -#define KCS_MSG_BUFSIZ 1000 - -#define KCS_ZERO_DATA 0 - - -/* IPMI 2.0 - Table 9-1, KCS Interface Status Register Bits */ -#define KCS_STATUS_STATE(state) (state << 6) -#define KCS_STATUS_STATE_MASK GENMASK(7, 6) -#define KCS_STATUS_CMD_DAT BIT(3) -#define KCS_STATUS_SMS_ATN BIT(2) -#define KCS_STATUS_IBF BIT(1) -#define KCS_STATUS_OBF BIT(0) - -/* IPMI 2.0 - Table 9-2, KCS Interface State Bits */ -enum kcs_states { - IDLE_STATE = 0, - READ_STATE = 1, - WRITE_STATE = 2, - ERROR_STATE = 3, -}; - -/* IPMI 2.0 - Table 9-3, KCS Interface Control Codes */ -#define KCS_CMD_GET_STATUS_ABORT 0x60 -#define KCS_CMD_WRITE_START 0x61 -#define KCS_CMD_WRITE_END 0x62 -#define KCS_CMD_READ_BYTE 0x68 - -static inline u8 kcs_bmc_read_data(struct kcs_bmc *kcs_bmc) +u8 kcs_bmc_read_data(struct kcs_bmc *kcs_bmc) { return kcs_bmc->io_inputb(kcs_bmc, kcs_bmc->ioreg.idr); } +EXPORT_SYMBOL(kcs_bmc_read_data); -static inline void kcs_bmc_write_data(struct kcs_bmc *kcs_bmc, u8 data) +void kcs_bmc_write_data(struct kcs_bmc *kcs_bmc, u8 data) { kcs_bmc->io_outputb(kcs_bmc, kcs_bmc->ioreg.odr, data); } +EXPORT_SYMBOL(kcs_bmc_write_data); -static inline u8 kcs_bmc_read_status(struct kcs_bmc *kcs_bmc) +u8 kcs_bmc_read_status(struct kcs_bmc *kcs_bmc) { return kcs_bmc->io_inputb(kcs_bmc, kcs_bmc->ioreg.str); } +EXPORT_SYMBOL(kcs_bmc_read_status); -static inline void kcs_bmc_write_status(struct kcs_bmc *kcs_bmc, u8 data) +void kcs_bmc_write_status(struct kcs_bmc *kcs_bmc, u8 data) { kcs_bmc->io_outputb(kcs_bmc, kcs_bmc->ioreg.str, data); } +EXPORT_SYMBOL(kcs_bmc_write_status); -static void kcs_bmc_update_status(struct kcs_bmc *kcs_bmc, u8 mask, u8 val) +void kcs_bmc_update_status(struct kcs_bmc *kcs_bmc, u8 mask, u8 val) { kcs_bmc->io_updateb(kcs_bmc, kcs_bmc->ioreg.str, mask, val); } +EXPORT_SYMBOL(kcs_bmc_update_status); -static inline void set_state(struct kcs_bmc *kcs_bmc, u8 state) -{ - kcs_bmc_update_status(kcs_bmc, KCS_STATUS_STATE_MASK, - KCS_STATUS_STATE(state)); -} - -static void kcs_force_abort(struct kcs_bmc *kcs_bmc) -{ - set_state(kcs_bmc, ERROR_STATE); - kcs_bmc_read_data(kcs_bmc); - kcs_bmc_write_data(kcs_bmc, KCS_ZERO_DATA); - - kcs_bmc->phase = KCS_PHASE_ERROR; - kcs_bmc->data_in_avail = false; - kcs_bmc->data_in_idx = 0; -} - -static void kcs_bmc_handle_data(struct kcs_bmc *kcs_bmc) -{ - u8 data; - - switch (kcs_bmc->phase) { - case KCS_PHASE_WRITE_START: - kcs_bmc->phase = KCS_PHASE_WRITE_DATA; - fallthrough; - - case KCS_PHASE_WRITE_DATA: - if (kcs_bmc->data_in_idx < KCS_MSG_BUFSIZ) { - set_state(kcs_bmc, WRITE_STATE); - kcs_bmc_write_data(kcs_bmc, KCS_ZERO_DATA); - kcs_bmc->data_in[kcs_bmc->data_in_idx++] = - kcs_bmc_read_data(kcs_bmc); - } else { - kcs_force_abort(kcs_bmc); - kcs_bmc->error = KCS_LENGTH_ERROR; - } - break; - - case KCS_PHASE_WRITE_END_CMD: - if (kcs_bmc->data_in_idx < KCS_MSG_BUFSIZ) { - set_state(kcs_bmc, READ_STATE); - kcs_bmc->data_in[kcs_bmc->data_in_idx++] = - kcs_bmc_read_data(kcs_bmc); - kcs_bmc->phase = KCS_PHASE_WRITE_DONE; - kcs_bmc->data_in_avail = true; - wake_up_interruptible(&kcs_bmc->queue); - } else { - kcs_force_abort(kcs_bmc); - kcs_bmc->error = KCS_LENGTH_ERROR; - } - break; - - case KCS_PHASE_READ: - if (kcs_bmc->data_out_idx == kcs_bmc->data_out_len) - set_state(kcs_bmc, IDLE_STATE); - - data = kcs_bmc_read_data(kcs_bmc); - if (data != KCS_CMD_READ_BYTE) { - set_state(kcs_bmc, ERROR_STATE); - kcs_bmc_write_data(kcs_bmc, KCS_ZERO_DATA); - break; - } - - if (kcs_bmc->data_out_idx == kcs_bmc->data_out_len) { - kcs_bmc_write_data(kcs_bmc, KCS_ZERO_DATA); - kcs_bmc->phase = KCS_PHASE_IDLE; - break; - } - - kcs_bmc_write_data(kcs_bmc, - kcs_bmc->data_out[kcs_bmc->data_out_idx++]); - break; - - case KCS_PHASE_ABORT_ERROR1: - set_state(kcs_bmc, READ_STATE); - kcs_bmc_read_data(kcs_bmc); - kcs_bmc_write_data(kcs_bmc, kcs_bmc->error); - kcs_bmc->phase = KCS_PHASE_ABORT_ERROR2; - break; - - case KCS_PHASE_ABORT_ERROR2: - set_state(kcs_bmc, IDLE_STATE); - kcs_bmc_read_data(kcs_bmc); - kcs_bmc_write_data(kcs_bmc, KCS_ZERO_DATA); - kcs_bmc->phase = KCS_PHASE_IDLE; - break; - - default: - kcs_force_abort(kcs_bmc); - break; - } -} - -static void kcs_bmc_handle_cmd(struct kcs_bmc *kcs_bmc) -{ - u8 cmd; - - set_state(kcs_bmc, WRITE_STATE); - kcs_bmc_write_data(kcs_bmc, KCS_ZERO_DATA); - - cmd = kcs_bmc_read_data(kcs_bmc); - switch (cmd) { - case KCS_CMD_WRITE_START: - kcs_bmc->phase = KCS_PHASE_WRITE_START; - kcs_bmc->error = KCS_NO_ERROR; - kcs_bmc->data_in_avail = false; - kcs_bmc->data_in_idx = 0; - break; - - case KCS_CMD_WRITE_END: - if (kcs_bmc->phase != KCS_PHASE_WRITE_DATA) { - kcs_force_abort(kcs_bmc); - break; - } - - kcs_bmc->phase = KCS_PHASE_WRITE_END_CMD; - break; - - case KCS_CMD_GET_STATUS_ABORT: - if (kcs_bmc->error == KCS_NO_ERROR) - kcs_bmc->error = KCS_ABORTED_BY_COMMAND; - - kcs_bmc->phase = KCS_PHASE_ABORT_ERROR1; - kcs_bmc->data_in_avail = false; - kcs_bmc->data_in_idx = 0; - break; - - default: - kcs_force_abort(kcs_bmc); - kcs_bmc->error = KCS_ILLEGAL_CONTROL_CODE; - break; - } -} - +int kcs_bmc_ipmi_event(struct kcs_bmc *kcs_bmc); int kcs_bmc_handle_event(struct kcs_bmc *kcs_bmc) { - unsigned long flags; - int ret = -ENODATA; - u8 status; - - spin_lock_irqsave(&kcs_bmc->lock, flags); - - status = kcs_bmc_read_status(kcs_bmc); - if (status & KCS_STATUS_IBF) { - if (!kcs_bmc->running) - kcs_force_abort(kcs_bmc); - else if (status & KCS_STATUS_CMD_DAT) - kcs_bmc_handle_cmd(kcs_bmc); - else - kcs_bmc_handle_data(kcs_bmc); - - ret = 0; - } - - spin_unlock_irqrestore(&kcs_bmc->lock, flags); - - return ret; + return kcs_bmc_ipmi_event(kcs_bmc); } EXPORT_SYMBOL(kcs_bmc_handle_event); -static inline struct kcs_bmc *to_kcs_bmc(struct file *filp) -{ - return container_of(filp->private_data, struct kcs_bmc, miscdev); -} - -static int kcs_bmc_open(struct inode *inode, struct file *filp) -{ - struct kcs_bmc *kcs_bmc = to_kcs_bmc(filp); - int ret = 0; - - spin_lock_irq(&kcs_bmc->lock); - if (!kcs_bmc->running) - kcs_bmc->running = 1; - else - ret = -EBUSY; - spin_unlock_irq(&kcs_bmc->lock); - - return ret; -} - -static __poll_t kcs_bmc_poll(struct file *filp, poll_table *wait) -{ - struct kcs_bmc *kcs_bmc = to_kcs_bmc(filp); - __poll_t mask = 0; - - poll_wait(filp, &kcs_bmc->queue, wait); - - spin_lock_irq(&kcs_bmc->lock); - if (kcs_bmc->data_in_avail) - mask |= EPOLLIN; - spin_unlock_irq(&kcs_bmc->lock); - - return mask; -} - -static ssize_t kcs_bmc_read(struct file *filp, char __user *buf, - size_t count, loff_t *ppos) -{ - struct kcs_bmc *kcs_bmc = to_kcs_bmc(filp); - bool data_avail; - size_t data_len; - ssize_t ret; - - if (!(filp->f_flags & O_NONBLOCK)) - wait_event_interruptible(kcs_bmc->queue, - kcs_bmc->data_in_avail); - - mutex_lock(&kcs_bmc->mutex); - - spin_lock_irq(&kcs_bmc->lock); - data_avail = kcs_bmc->data_in_avail; - if (data_avail) { - data_len = kcs_bmc->data_in_idx; - memcpy(kcs_bmc->kbuffer, kcs_bmc->data_in, data_len); - } - spin_unlock_irq(&kcs_bmc->lock); - - if (!data_avail) { - ret = -EAGAIN; - goto out_unlock; - } - - if (count < data_len) { - pr_err("channel=%u with too large data : %zu\n", - kcs_bmc->channel, data_len); - - spin_lock_irq(&kcs_bmc->lock); - kcs_force_abort(kcs_bmc); - spin_unlock_irq(&kcs_bmc->lock); - - ret = -EOVERFLOW; - goto out_unlock; - } - - if (copy_to_user(buf, kcs_bmc->kbuffer, data_len)) { - ret = -EFAULT; - goto out_unlock; - } - - ret = data_len; - - spin_lock_irq(&kcs_bmc->lock); - if (kcs_bmc->phase == KCS_PHASE_WRITE_DONE) { - kcs_bmc->phase = KCS_PHASE_WAIT_READ; - kcs_bmc->data_in_avail = false; - kcs_bmc->data_in_idx = 0; - } else { - ret = -EAGAIN; - } - spin_unlock_irq(&kcs_bmc->lock); - -out_unlock: - mutex_unlock(&kcs_bmc->mutex); - - return ret; -} - -static ssize_t kcs_bmc_write(struct file *filp, const char __user *buf, - size_t count, loff_t *ppos) -{ - struct kcs_bmc *kcs_bmc = to_kcs_bmc(filp); - ssize_t ret; - - /* a minimum response size '3' : netfn + cmd + ccode */ - if (count < 3 || count > KCS_MSG_BUFSIZ) - return -EINVAL; - - mutex_lock(&kcs_bmc->mutex); - - if (copy_from_user(kcs_bmc->kbuffer, buf, count)) { - ret = -EFAULT; - goto out_unlock; - } - - spin_lock_irq(&kcs_bmc->lock); - if (kcs_bmc->phase == KCS_PHASE_WAIT_READ) { - kcs_bmc->phase = KCS_PHASE_READ; - kcs_bmc->data_out_idx = 1; - kcs_bmc->data_out_len = count; - memcpy(kcs_bmc->data_out, kcs_bmc->kbuffer, count); - kcs_bmc_write_data(kcs_bmc, kcs_bmc->data_out[0]); - ret = count; - } else { - ret = -EINVAL; - } - spin_unlock_irq(&kcs_bmc->lock); - -out_unlock: - mutex_unlock(&kcs_bmc->mutex); - - return ret; -} - -static long kcs_bmc_ioctl(struct file *filp, unsigned int cmd, - unsigned long arg) -{ - struct kcs_bmc *kcs_bmc = to_kcs_bmc(filp); - long ret = 0; - - spin_lock_irq(&kcs_bmc->lock); - - switch (cmd) { - case IPMI_BMC_IOCTL_SET_SMS_ATN: - kcs_bmc_update_status(kcs_bmc, KCS_STATUS_SMS_ATN, KCS_STATUS_SMS_ATN); - break; - - case IPMI_BMC_IOCTL_CLEAR_SMS_ATN: - kcs_bmc_update_status(kcs_bmc, KCS_STATUS_SMS_ATN, 0); - break; - - case IPMI_BMC_IOCTL_FORCE_ABORT: - kcs_force_abort(kcs_bmc); - break; - - default: - ret = -EINVAL; - break; - } - - spin_unlock_irq(&kcs_bmc->lock); - - return ret; -} - -static int kcs_bmc_release(struct inode *inode, struct file *filp) -{ - struct kcs_bmc *kcs_bmc = to_kcs_bmc(filp); - - spin_lock_irq(&kcs_bmc->lock); - kcs_bmc->running = 0; - kcs_force_abort(kcs_bmc); - spin_unlock_irq(&kcs_bmc->lock); - - return 0; -} - -static const struct file_operations kcs_bmc_fops = { - .owner = THIS_MODULE, - .open = kcs_bmc_open, - .read = kcs_bmc_read, - .write = kcs_bmc_write, - .release = kcs_bmc_release, - .poll = kcs_bmc_poll, - .unlocked_ioctl = kcs_bmc_ioctl, -}; - +struct kcs_bmc *kcs_bmc_ipmi_alloc(struct device *dev, int sizeof_priv, u32 channel); struct kcs_bmc *kcs_bmc_alloc(struct device *dev, int sizeof_priv, u32 channel) { - struct kcs_bmc *kcs_bmc; - - kcs_bmc = devm_kzalloc(dev, sizeof(*kcs_bmc) + sizeof_priv, GFP_KERNEL); - if (!kcs_bmc) - return NULL; - - spin_lock_init(&kcs_bmc->lock); - kcs_bmc->channel = channel; - - mutex_init(&kcs_bmc->mutex); - init_waitqueue_head(&kcs_bmc->queue); - - kcs_bmc->data_in = devm_kmalloc(dev, KCS_MSG_BUFSIZ, GFP_KERNEL); - kcs_bmc->data_out = devm_kmalloc(dev, KCS_MSG_BUFSIZ, GFP_KERNEL); - kcs_bmc->kbuffer = devm_kmalloc(dev, KCS_MSG_BUFSIZ, GFP_KERNEL); - - kcs_bmc->miscdev.minor = MISC_DYNAMIC_MINOR; - kcs_bmc->miscdev.name = devm_kasprintf(dev, GFP_KERNEL, "%s%u", - DEVICE_NAME, channel); - if (!kcs_bmc->data_in || !kcs_bmc->data_out || !kcs_bmc->kbuffer || - !kcs_bmc->miscdev.name) - return NULL; - kcs_bmc->miscdev.fops = &kcs_bmc_fops; - - return kcs_bmc; + return kcs_bmc_ipmi_alloc(dev, sizeof_priv, channel); } EXPORT_SYMBOL(kcs_bmc_alloc); diff --git a/drivers/char/ipmi/kcs_bmc.h b/drivers/char/ipmi/kcs_bmc.h index 970f53892f2d..febea0c8deb4 100644 --- a/drivers/char/ipmi/kcs_bmc.h +++ b/drivers/char/ipmi/kcs_bmc.h @@ -104,6 +104,12 @@ static inline void *kcs_bmc_priv(struct kcs_bmc *kcs_bmc) } int kcs_bmc_handle_event(struct kcs_bmc *kcs_bmc); -struct kcs_bmc *kcs_bmc_alloc(struct device *dev, int sizeof_priv, - u32 channel); +struct kcs_bmc *kcs_bmc_alloc(struct device *dev, int sizeof_priv, u32 channel); + +u8 kcs_bmc_read_data(struct kcs_bmc *kcs_bmc); +void kcs_bmc_write_data(struct kcs_bmc *kcs_bmc, u8 data); +u8 kcs_bmc_read_status(struct kcs_bmc *kcs_bmc); +void kcs_bmc_write_status(struct kcs_bmc *kcs_bmc, u8 data); +void kcs_bmc_update_status(struct kcs_bmc *kcs_bmc, u8 mask, u8 val); + #endif /* __KCS_BMC_H__ */ diff --git a/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c b/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c new file mode 100644 index 000000000000..bc011db0ec01 --- /dev/null +++ b/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c @@ -0,0 +1,426 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2015-2018, Intel Corporation. + */ + +#define pr_fmt(fmt) "kcs-bmc: " fmt + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "kcs_bmc.h" + +#define DEVICE_NAME "ipmi-kcs" + +#define KCS_MSG_BUFSIZ 1000 + +#define KCS_ZERO_DATA 0 + + +/* IPMI 2.0 - Table 9-1, KCS Interface Status Register Bits */ +#define KCS_STATUS_STATE(state) (state << 6) +#define KCS_STATUS_STATE_MASK GENMASK(7, 6) +#define KCS_STATUS_CMD_DAT BIT(3) +#define KCS_STATUS_SMS_ATN BIT(2) +#define KCS_STATUS_IBF BIT(1) +#define KCS_STATUS_OBF BIT(0) + +/* IPMI 2.0 - Table 9-2, KCS Interface State Bits */ +enum kcs_states { + IDLE_STATE = 0, + READ_STATE = 1, + WRITE_STATE = 2, + ERROR_STATE = 3, +}; + +/* IPMI 2.0 - Table 9-3, KCS Interface Control Codes */ +#define KCS_CMD_GET_STATUS_ABORT 0x60 +#define KCS_CMD_WRITE_START 0x61 +#define KCS_CMD_WRITE_END 0x62 +#define KCS_CMD_READ_BYTE 0x68 + +static inline void set_state(struct kcs_bmc *kcs_bmc, u8 state) +{ + kcs_bmc_update_status(kcs_bmc, KCS_STATUS_STATE_MASK, + KCS_STATUS_STATE(state)); +} + +static void kcs_bmc_ipmi_force_abort(struct kcs_bmc *kcs_bmc) +{ + set_state(kcs_bmc, ERROR_STATE); + kcs_bmc_read_data(kcs_bmc); + kcs_bmc_write_data(kcs_bmc, KCS_ZERO_DATA); + + kcs_bmc->phase = KCS_PHASE_ERROR; + kcs_bmc->data_in_avail = false; + kcs_bmc->data_in_idx = 0; +} + +static void kcs_bmc_ipmi_handle_data(struct kcs_bmc *kcs_bmc) +{ + u8 data; + + switch (kcs_bmc->phase) { + case KCS_PHASE_WRITE_START: + kcs_bmc->phase = KCS_PHASE_WRITE_DATA; + fallthrough; + + case KCS_PHASE_WRITE_DATA: + if (kcs_bmc->data_in_idx < KCS_MSG_BUFSIZ) { + set_state(kcs_bmc, WRITE_STATE); + kcs_bmc_write_data(kcs_bmc, KCS_ZERO_DATA); + kcs_bmc->data_in[kcs_bmc->data_in_idx++] = + kcs_bmc_read_data(kcs_bmc); + } else { + kcs_bmc_ipmi_force_abort(kcs_bmc); + kcs_bmc->error = KCS_LENGTH_ERROR; + } + break; + + case KCS_PHASE_WRITE_END_CMD: + if (kcs_bmc->data_in_idx < KCS_MSG_BUFSIZ) { + set_state(kcs_bmc, READ_STATE); + kcs_bmc->data_in[kcs_bmc->data_in_idx++] = + kcs_bmc_read_data(kcs_bmc); + kcs_bmc->phase = KCS_PHASE_WRITE_DONE; + kcs_bmc->data_in_avail = true; + wake_up_interruptible(&kcs_bmc->queue); + } else { + kcs_bmc_ipmi_force_abort(kcs_bmc); + kcs_bmc->error = KCS_LENGTH_ERROR; + } + break; + + case KCS_PHASE_READ: + if (kcs_bmc->data_out_idx == kcs_bmc->data_out_len) + set_state(kcs_bmc, IDLE_STATE); + + data = kcs_bmc_read_data(kcs_bmc); + if (data != KCS_CMD_READ_BYTE) { + set_state(kcs_bmc, ERROR_STATE); + kcs_bmc_write_data(kcs_bmc, KCS_ZERO_DATA); + break; + } + + if (kcs_bmc->data_out_idx == kcs_bmc->data_out_len) { + kcs_bmc_write_data(kcs_bmc, KCS_ZERO_DATA); + kcs_bmc->phase = KCS_PHASE_IDLE; + break; + } + + kcs_bmc_write_data(kcs_bmc, + kcs_bmc->data_out[kcs_bmc->data_out_idx++]); + break; + + case KCS_PHASE_ABORT_ERROR1: + set_state(kcs_bmc, READ_STATE); + kcs_bmc_read_data(kcs_bmc); + kcs_bmc_write_data(kcs_bmc, kcs_bmc->error); + kcs_bmc->phase = KCS_PHASE_ABORT_ERROR2; + break; + + case KCS_PHASE_ABORT_ERROR2: + set_state(kcs_bmc, IDLE_STATE); + kcs_bmc_read_data(kcs_bmc); + kcs_bmc_write_data(kcs_bmc, KCS_ZERO_DATA); + kcs_bmc->phase = KCS_PHASE_IDLE; + break; + + default: + kcs_bmc_ipmi_force_abort(kcs_bmc); + break; + } +} + +static void kcs_bmc_ipmi_handle_cmd(struct kcs_bmc *kcs_bmc) +{ + u8 cmd; + + set_state(kcs_bmc, WRITE_STATE); + kcs_bmc_write_data(kcs_bmc, KCS_ZERO_DATA); + + cmd = kcs_bmc_read_data(kcs_bmc); + switch (cmd) { + case KCS_CMD_WRITE_START: + kcs_bmc->phase = KCS_PHASE_WRITE_START; + kcs_bmc->error = KCS_NO_ERROR; + kcs_bmc->data_in_avail = false; + kcs_bmc->data_in_idx = 0; + break; + + case KCS_CMD_WRITE_END: + if (kcs_bmc->phase != KCS_PHASE_WRITE_DATA) { + kcs_bmc_ipmi_force_abort(kcs_bmc); + break; + } + + kcs_bmc->phase = KCS_PHASE_WRITE_END_CMD; + break; + + case KCS_CMD_GET_STATUS_ABORT: + if (kcs_bmc->error == KCS_NO_ERROR) + kcs_bmc->error = KCS_ABORTED_BY_COMMAND; + + kcs_bmc->phase = KCS_PHASE_ABORT_ERROR1; + kcs_bmc->data_in_avail = false; + kcs_bmc->data_in_idx = 0; + break; + + default: + kcs_bmc_ipmi_force_abort(kcs_bmc); + kcs_bmc->error = KCS_ILLEGAL_CONTROL_CODE; + break; + } +} + +int kcs_bmc_ipmi_event(struct kcs_bmc *kcs_bmc) +{ + unsigned long flags; + int ret = -ENODATA; + u8 status; + + spin_lock_irqsave(&kcs_bmc->lock, flags); + + status = kcs_bmc_read_status(kcs_bmc); + if (status & KCS_STATUS_IBF) { + if (!kcs_bmc->running) + kcs_bmc_ipmi_force_abort(kcs_bmc); + else if (status & KCS_STATUS_CMD_DAT) + kcs_bmc_ipmi_handle_cmd(kcs_bmc); + else + kcs_bmc_ipmi_handle_data(kcs_bmc); + + ret = 0; + } + + spin_unlock_irqrestore(&kcs_bmc->lock, flags); + + return ret; +} +EXPORT_SYMBOL(kcs_bmc_ipmi_event); + +static inline struct kcs_bmc *to_kcs_bmc(struct file *filp) +{ + return container_of(filp->private_data, struct kcs_bmc, miscdev); +} + +static int kcs_bmc_ipmi_open(struct inode *inode, struct file *filp) +{ + struct kcs_bmc *kcs_bmc = to_kcs_bmc(filp); + int ret = 0; + + spin_lock_irq(&kcs_bmc->lock); + if (!kcs_bmc->running) + kcs_bmc->running = 1; + else + ret = -EBUSY; + spin_unlock_irq(&kcs_bmc->lock); + + return ret; +} + +static __poll_t kcs_bmc_ipmi_poll(struct file *filp, poll_table *wait) +{ + struct kcs_bmc *kcs_bmc = to_kcs_bmc(filp); + __poll_t mask = 0; + + poll_wait(filp, &kcs_bmc->queue, wait); + + spin_lock_irq(&kcs_bmc->lock); + if (kcs_bmc->data_in_avail) + mask |= EPOLLIN; + spin_unlock_irq(&kcs_bmc->lock); + + return mask; +} + +static ssize_t kcs_bmc_ipmi_read(struct file *filp, char __user *buf, + size_t count, loff_t *ppos) +{ + struct kcs_bmc *kcs_bmc = to_kcs_bmc(filp); + bool data_avail; + size_t data_len; + ssize_t ret; + + if (!(filp->f_flags & O_NONBLOCK)) + wait_event_interruptible(kcs_bmc->queue, + kcs_bmc->data_in_avail); + + mutex_lock(&kcs_bmc->mutex); + + spin_lock_irq(&kcs_bmc->lock); + data_avail = kcs_bmc->data_in_avail; + if (data_avail) { + data_len = kcs_bmc->data_in_idx; + memcpy(kcs_bmc->kbuffer, kcs_bmc->data_in, data_len); + } + spin_unlock_irq(&kcs_bmc->lock); + + if (!data_avail) { + ret = -EAGAIN; + goto out_unlock; + } + + if (count < data_len) { + pr_err("channel=%u with too large data : %zu\n", + kcs_bmc->channel, data_len); + + spin_lock_irq(&kcs_bmc->lock); + kcs_bmc_ipmi_force_abort(kcs_bmc); + spin_unlock_irq(&kcs_bmc->lock); + + ret = -EOVERFLOW; + goto out_unlock; + } + + if (copy_to_user(buf, kcs_bmc->kbuffer, data_len)) { + ret = -EFAULT; + goto out_unlock; + } + + ret = data_len; + + spin_lock_irq(&kcs_bmc->lock); + if (kcs_bmc->phase == KCS_PHASE_WRITE_DONE) { + kcs_bmc->phase = KCS_PHASE_WAIT_READ; + kcs_bmc->data_in_avail = false; + kcs_bmc->data_in_idx = 0; + } else { + ret = -EAGAIN; + } + spin_unlock_irq(&kcs_bmc->lock); + +out_unlock: + mutex_unlock(&kcs_bmc->mutex); + + return ret; +} + +static ssize_t kcs_bmc_ipmi_write(struct file *filp, const char __user *buf, + size_t count, loff_t *ppos) +{ + struct kcs_bmc *kcs_bmc = to_kcs_bmc(filp); + ssize_t ret; + + /* a minimum response size '3' : netfn + cmd + ccode */ + if (count < 3 || count > KCS_MSG_BUFSIZ) + return -EINVAL; + + mutex_lock(&kcs_bmc->mutex); + + if (copy_from_user(kcs_bmc->kbuffer, buf, count)) { + ret = -EFAULT; + goto out_unlock; + } + + spin_lock_irq(&kcs_bmc->lock); + if (kcs_bmc->phase == KCS_PHASE_WAIT_READ) { + kcs_bmc->phase = KCS_PHASE_READ; + kcs_bmc->data_out_idx = 1; + kcs_bmc->data_out_len = count; + memcpy(kcs_bmc->data_out, kcs_bmc->kbuffer, count); + kcs_bmc_write_data(kcs_bmc, kcs_bmc->data_out[0]); + ret = count; + } else { + ret = -EINVAL; + } + spin_unlock_irq(&kcs_bmc->lock); + +out_unlock: + mutex_unlock(&kcs_bmc->mutex); + + return ret; +} + +static long kcs_bmc_ipmi_ioctl(struct file *filp, unsigned int cmd, + unsigned long arg) +{ + struct kcs_bmc *kcs_bmc = to_kcs_bmc(filp); + long ret = 0; + + spin_lock_irq(&kcs_bmc->lock); + + switch (cmd) { + case IPMI_BMC_IOCTL_SET_SMS_ATN: + kcs_bmc_update_status(kcs_bmc, KCS_STATUS_SMS_ATN, KCS_STATUS_SMS_ATN); + break; + + case IPMI_BMC_IOCTL_CLEAR_SMS_ATN: + kcs_bmc_update_status(kcs_bmc, KCS_STATUS_SMS_ATN, 0); + break; + + case IPMI_BMC_IOCTL_FORCE_ABORT: + kcs_bmc_ipmi_force_abort(kcs_bmc); + break; + + default: + ret = -EINVAL; + break; + } + + spin_unlock_irq(&kcs_bmc->lock); + + return ret; +} + +static int kcs_bmc_ipmi_release(struct inode *inode, struct file *filp) +{ + struct kcs_bmc *kcs_bmc = to_kcs_bmc(filp); + + spin_lock_irq(&kcs_bmc->lock); + kcs_bmc->running = 0; + kcs_bmc_ipmi_force_abort(kcs_bmc); + spin_unlock_irq(&kcs_bmc->lock); + + return 0; +} + +static const struct file_operations kcs_bmc_fops = { + .owner = THIS_MODULE, + .open = kcs_bmc_ipmi_open, + .read = kcs_bmc_ipmi_read, + .write = kcs_bmc_ipmi_write, + .release = kcs_bmc_ipmi_release, + .poll = kcs_bmc_ipmi_poll, + .unlocked_ioctl = kcs_bmc_ipmi_ioctl, +}; + +struct kcs_bmc *kcs_bmc_ipmi_alloc(struct device *dev, int sizeof_priv, u32 channel) +{ + struct kcs_bmc *kcs_bmc; + + kcs_bmc = devm_kzalloc(dev, sizeof(*kcs_bmc) + sizeof_priv, GFP_KERNEL); + if (!kcs_bmc) + return NULL; + + spin_lock_init(&kcs_bmc->lock); + kcs_bmc->channel = channel; + + mutex_init(&kcs_bmc->mutex); + init_waitqueue_head(&kcs_bmc->queue); + + kcs_bmc->data_in = devm_kmalloc(dev, KCS_MSG_BUFSIZ, GFP_KERNEL); + kcs_bmc->data_out = devm_kmalloc(dev, KCS_MSG_BUFSIZ, GFP_KERNEL); + kcs_bmc->kbuffer = devm_kmalloc(dev, KCS_MSG_BUFSIZ, GFP_KERNEL); + + kcs_bmc->miscdev.minor = MISC_DYNAMIC_MINOR; + kcs_bmc->miscdev.name = devm_kasprintf(dev, GFP_KERNEL, "%s%u", + DEVICE_NAME, channel); + if (!kcs_bmc->data_in || !kcs_bmc->data_out || !kcs_bmc->kbuffer || + !kcs_bmc->miscdev.name) + return NULL; + kcs_bmc->miscdev.fops = &kcs_bmc_fops; + + return kcs_bmc; +} +EXPORT_SYMBOL(kcs_bmc_ipmi_alloc); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Haiyue Wang "); +MODULE_DESCRIPTION("KCS BMC to handle the IPMI request from system software");