From patchwork Tue May 12 02:33:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bhaumik Bhatt X-Patchwork-Id: 11541933 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5B28581 for ; Tue, 12 May 2020 02:33:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 34616206B7 for ; Tue, 12 May 2020 02:33:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="u6iIPvOi" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728678AbgELCdv (ORCPT ); Mon, 11 May 2020 22:33:51 -0400 Received: from mail27.static.mailgun.info ([104.130.122.27]:24980 "EHLO mail27.static.mailgun.info" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728662AbgELCds (ORCPT ); Mon, 11 May 2020 22:33:48 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1589250827; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=aFHVyapQ7QIkcdqD4mv8GG60YvtPXPtJjFnTk/6+95o=; b=u6iIPvOi2FXQ7F3/g9E6rrG9mIIzfN/rbbqpad9W3nIYJ3bkeFY58Trq8VERhzbH4Z1pr/3j MdG613zkvgiVc1GrlwfbUwW/hzAMVJV5KPvDKi5hrOoKr3fC26ctgpoVwJ2CUOdvwUweNIp+ A1FqCKIUx2cIQao8KvkWqFVIDfw= X-Mailgun-Sending-Ip: 104.130.122.27 X-Mailgun-Sid: WyI1MzIzYiIsICJsaW51eC1hcm0tbXNtQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by mxa.mailgun.org with ESMTP id 5eba0af7.7f8ac5b55260-smtp-out-n01; Tue, 12 May 2020 02:33:27 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 68C2AC4478F; Tue, 12 May 2020 02:33:26 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-caf-mail-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=2.0 tests=ALL_TRUSTED,SPF_NONE autolearn=ham autolearn_force=no version=3.4.0 Received: from bbhatt-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: bbhatt) by smtp.codeaurora.org (Postfix) with ESMTPSA id 10916C44788; Tue, 12 May 2020 02:33:25 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 10916C44788 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=bbhatt@codeaurora.org From: Bhaumik Bhatt To: manivannan.sadhasivam@linaro.org Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, hemantk@codeaurora.org, jhugo@codeaurora.org, Bhaumik Bhatt Subject: [PATCH v1 4/6] bus: mhi: core: Introduce debugfs entries and counters for MHI Date: Mon, 11 May 2020 19:33:14 -0700 Message-Id: <1589250796-32020-5-git-send-email-bbhatt@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1589250796-32020-1-git-send-email-bbhatt@codeaurora.org> References: <1589250796-32020-1-git-send-email-bbhatt@codeaurora.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Introduce debugfs entries to show state, channel, and event ring information. Add MHI state counters to keep track of the state changes on the device and add a helper API mhi_to_physical() to see the physical address from debugfs. Also, allow the host to trigger a device reset, issue bus or device votes, and change the MHI timeout to help in debug. Signed-off-by: Bhaumik Bhatt --- drivers/bus/mhi/Kconfig | 8 + drivers/bus/mhi/core/Makefile | 5 +- drivers/bus/mhi/core/debugfs.c | 431 ++++++++++++++++++++++++++++++++++++++++ drivers/bus/mhi/core/init.c | 7 + drivers/bus/mhi/core/internal.h | 24 +++ drivers/bus/mhi/core/pm.c | 4 + include/linux/mhi.h | 4 + 7 files changed, 480 insertions(+), 3 deletions(-) create mode 100644 drivers/bus/mhi/core/debugfs.c diff --git a/drivers/bus/mhi/Kconfig b/drivers/bus/mhi/Kconfig index a8bd9bd..6a217ff 100644 --- a/drivers/bus/mhi/Kconfig +++ b/drivers/bus/mhi/Kconfig @@ -12,3 +12,11 @@ config MHI_BUS communication protocol used by the host processors to control and communicate with modem devices over a high speed peripheral bus or shared memory. + +config MHI_BUS_DEBUG + bool "Debugfs support for the MHI bus" + depends on MHI_BUS && DEBUG_FS + help + Enable debugfs support for use with the MHI transport. Allows + reading and/or modifying some values within the MHI controller + for debug and test purposes. diff --git a/drivers/bus/mhi/core/Makefile b/drivers/bus/mhi/core/Makefile index 66e2700..460a548 100644 --- a/drivers/bus/mhi/core/Makefile +++ b/drivers/bus/mhi/core/Makefile @@ -1,3 +1,2 @@ -obj-$(CONFIG_MHI_BUS) := mhi.o - -mhi-y := init.o main.o pm.o boot.o +obj-$(CONFIG_MHI_BUS) := init.o main.o pm.o boot.o +obj-$(CONFIG_MHI_BUS_DEBUG) += debugfs.o diff --git a/drivers/bus/mhi/core/debugfs.c b/drivers/bus/mhi/core/debugfs.c new file mode 100644 index 0000000..fa70666 --- /dev/null +++ b/drivers/bus/mhi/core/debugfs.c @@ -0,0 +1,431 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2020, The Linux Foundation. All rights reserved. + * + */ + +#include +#include +#include +#include +#include +#include "internal.h" + +static int mhi_debugfs_states_show(struct seq_file *m, void *d) +{ + struct mhi_controller *mhi_cntrl = m->private; + + /* states */ + seq_printf(m, "PM state:%s Device:%s MHI state:%s EE:%s wake:%s\n", + to_mhi_pm_state_str(mhi_cntrl->pm_state), + mhi_is_active(mhi_cntrl) ? "Active" : "Inactive", + TO_MHI_STATE_STR(mhi_cntrl->dev_state), + TO_MHI_EXEC_STR(mhi_cntrl->ee), + mhi_cntrl->wake_set ? "true" : "false"); + + /* counters */ + seq_printf(m, "M0:%u M2:%u M3:%u M3_Fast:%u", mhi_cntrl->M0, + mhi_cntrl->M2, mhi_cntrl->M3, mhi_cntrl->M3_fast); + + seq_printf(m, " device wake:%u pending packets:%u\n", + atomic_read(&mhi_cntrl->dev_wake), + atomic_read(&mhi_cntrl->pending_pkts)); + + return 0; +} + +static int mhi_debugfs_events_show(struct seq_file *m, void *d) +{ + struct mhi_controller *mhi_cntrl = m->private; + struct mhi_event *mhi_event; + struct mhi_event_ctxt *er_ctxt; + int i; + + if (!mhi_is_active(mhi_cntrl)) { + seq_puts(m, "Device not ready\n"); + return -ENODEV; + } + + er_ctxt = mhi_cntrl->mhi_ctxt->er_ctxt; + mhi_event = mhi_cntrl->mhi_event; + for (i = 0; i < mhi_cntrl->total_ev_rings; + i++, er_ctxt++, mhi_event++) { + struct mhi_ring *ring = &mhi_event->ring; + + if (mhi_event->offload_ev) { + seq_printf(m, "Index:%d is an offload event ring\n", i); + continue; + } + + seq_printf(m, "Index:%d intmod count:%lu time:%lu", + i, (er_ctxt->intmod & EV_CTX_INTMODC_MASK) >> + EV_CTX_INTMODC_SHIFT, + (er_ctxt->intmod & EV_CTX_INTMODT_MASK) >> + EV_CTX_INTMODT_SHIFT); + + seq_printf(m, " base:0x%0llx len:0x%llx", er_ctxt->rbase, + er_ctxt->rlen); + + seq_printf(m, + " rp:0x%llx wp:0x%llx local rp:0x%llx db:0x%llx\n", + er_ctxt->rp, er_ctxt->wp, (u64)ring->rp, + mhi_event->db_cfg.db_val); + } + + return 0; +} + +static int mhi_debugfs_channels_show(struct seq_file *m, void *d) +{ + struct mhi_controller *mhi_cntrl = m->private; + struct mhi_chan *mhi_chan; + struct mhi_chan_ctxt *chan_ctxt; + int i; + + if (!mhi_is_active(mhi_cntrl)) { + seq_puts(m, "Device not ready\n"); + return -ENODEV; + } + + mhi_chan = mhi_cntrl->mhi_chan; + chan_ctxt = mhi_cntrl->mhi_ctxt->chan_ctxt; + for (i = 0; i < mhi_cntrl->max_chan; i++, chan_ctxt++, mhi_chan++) { + struct mhi_ring *ring = &mhi_chan->tre_ring; + + if (mhi_chan->offload_ch) { + seq_printf(m, "%s(%u) is an offload channel\n", + mhi_chan->name, mhi_chan->chan); + continue; + } + + if (!mhi_chan->mhi_dev) + continue; + + seq_printf(m, + "%s(%u) state:0x%lx brstmode:0x%lx pollcfg:0x%lx", + mhi_chan->name, mhi_chan->chan, (chan_ctxt->chcfg & + CHAN_CTX_CHSTATE_MASK) >> CHAN_CTX_CHSTATE_SHIFT, + (chan_ctxt->chcfg & CHAN_CTX_BRSTMODE_MASK) >> + CHAN_CTX_BRSTMODE_SHIFT, (chan_ctxt->chcfg & + CHAN_CTX_POLLCFG_MASK) >> CHAN_CTX_POLLCFG_SHIFT); + + seq_printf(m, " type:0x%x event ring:%u", chan_ctxt->chtype, + chan_ctxt->erindex); + + seq_printf(m, " base:0x%llx len:0x%llx wp:0x%llx", + chan_ctxt->rbase, chan_ctxt->rlen, chan_ctxt->wp); + + seq_printf(m, " local rp:0x%llx local wp:0x%llx db:0x%llx\n", + (u64)ring->rp, (u64)ring->wp, + mhi_chan->db_cfg.db_val); + } + + return 0; +} + +static int mhi_device_votes_show(struct device *dev, void *data) +{ + struct mhi_device *mhi_dev; + + if (dev->bus != &mhi_bus_type) + return 0; + + mhi_dev = to_mhi_device(dev); + + seq_printf((struct seq_file *)data, "%s: device:%u, bus:%u\n", + mhi_dev->name, atomic_read(&mhi_dev->dev_vote), + atomic_read(&mhi_dev->bus_vote)); + + return 0; +} + +static int mhi_debugfs_votes_show(struct seq_file *m, void *d) +{ + struct mhi_controller *mhi_cntrl = m->private; + + if (!mhi_is_active(mhi_cntrl)) { + seq_puts(m, "Device not ready\n"); + return -ENODEV; + } + + device_for_each_child(mhi_cntrl->cntrl_dev, m, mhi_device_votes_show); + + return 0; +} + +static int mhi_debugfs_bus_vote_show(struct seq_file *m, void *d) +{ + struct mhi_controller *mhi_cntrl = m->private; + struct mhi_device *mhi_dev = mhi_cntrl->mhi_dev; + + if (!mhi_is_active(mhi_cntrl)) { + seq_puts(m, "Device not ready\n"); + return -ENODEV; + } + + seq_printf(m, "Votes: %d\n%s\n", atomic_read(&mhi_dev->bus_vote), + "Usage: echo get/put > bus_vote for vote/unvote"); + + return 0; +} + +static ssize_t mhi_debugfs_bus_vote_write(struct file *file, + const char __user *ubuf, + size_t count, loff_t *ppos) +{ + struct seq_file *m = file->private_data; + struct mhi_controller *mhi_cntrl = m->private; + struct mhi_device *mhi_dev = mhi_cntrl->mhi_dev; + char buf[32]; + int ret = -EINVAL; + + if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count))) + return -EFAULT; + + if (!strncmp(buf, "get", 3)) { + ret = mhi_device_get_sync(mhi_dev, MHI_VOTE_BUS); + } else if (!strncmp(buf, "put", 3)) { + mhi_device_put(mhi_dev, MHI_VOTE_BUS); + ret = 0; + } + + return ret ? ret : count; +} + +static int mhi_debugfs_device_vote_show(struct seq_file *m, void *d) +{ + struct mhi_controller *mhi_cntrl = m->private; + struct mhi_device *mhi_dev = mhi_cntrl->mhi_dev; + + if (!mhi_is_active(mhi_cntrl)) { + seq_puts(m, "Device not ready\n"); + return -ENODEV; + } + + seq_printf(m, + "Votes: %d\n%s\n", atomic_read(&mhi_dev->dev_vote), + "Usage: echo get/put > device_vote for vote/unvote"); + + return 0; +} + +static ssize_t mhi_debugfs_device_vote_write(struct file *file, + const char __user *ubuf, + size_t count, loff_t *ppos) +{ + struct seq_file *m = file->private_data; + struct mhi_controller *mhi_cntrl = m->private; + struct mhi_device *mhi_dev = mhi_cntrl->mhi_dev; + char buf[32]; + int ret = -EINVAL; + + if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count))) + return -EFAULT; + + if (!strncmp(buf, "get", 3)) { + ret = mhi_device_get_sync(mhi_dev, MHI_VOTE_DEVICE); + } else if (!strncmp(buf, "put", 3)) { + mhi_device_put(mhi_dev, MHI_VOTE_DEVICE); + ret = 0; + } + + return ret ? ret : count; +} + +static int mhi_debugfs_timeout_ms_show(struct seq_file *m, void *d) +{ + struct mhi_controller *mhi_cntrl = m->private; + + seq_printf(m, "%u ms\n", mhi_cntrl->timeout_ms); + + return 0; +} + +static ssize_t mhi_debugfs_timeout_ms_write(struct file *file, + const char __user *ubuf, + size_t count, loff_t *ppos) +{ + struct seq_file *m = file->private_data; + struct mhi_controller *mhi_cntrl = m->private; + u32 timeout_ms; + + if (kstrtou32_from_user(ubuf, count, 0, &timeout_ms)) + return -EINVAL; + + mhi_cntrl->timeout_ms = timeout_ms; + + return count; +} + +static int mhi_debugfs_trigger_reset(void *data, u64 val) +{ + struct mhi_controller *mhi_cntrl = data; + struct mhi_device *mhi_dev = mhi_cntrl->mhi_dev; + struct device *dev = &mhi_dev->dev; + enum mhi_pm_state cur_state; + int ret = -EIO; + + if (!mhi_is_active(mhi_cntrl)) + return -ENODEV; + + if (!val) + return -EINVAL; + + ret = mhi_device_get_sync(mhi_dev, MHI_VOTE_DEVICE); + if (ret) { + dev_err(dev, "Device did not enter M0 state, MHI:%s, PM:%s\n", + TO_MHI_STATE_STR(mhi_cntrl->dev_state), + to_mhi_pm_state_str(mhi_cntrl->pm_state)); + return ret; + } + + if (mhi_cntrl->rddm_image) { + ret = mhi_force_rddm_mode(mhi_cntrl); + goto exit_mhi_trigger_reset; + } + + write_lock_irq(&mhi_cntrl->pm_lock); + cur_state = mhi_tryset_pm_state(mhi_cntrl, MHI_PM_SYS_ERR_DETECT); + write_unlock_irq(&mhi_cntrl->pm_lock); + + if (cur_state != MHI_PM_SYS_ERR_DETECT) + goto exit_mhi_trigger_reset; + + mhi_pm_sys_err_handler(mhi_cntrl); + ret = 0; + +exit_mhi_trigger_reset: + mhi_device_put(mhi_dev, MHI_VOTE_DEVICE); + + return ret; +} + +static int mhi_debugfs_states_open(struct inode *inode, struct file *fp) +{ + return single_open(fp, mhi_debugfs_states_show, inode->i_private); +} + +static int mhi_debugfs_events_open(struct inode *inode, struct file *fp) +{ + return single_open(fp, mhi_debugfs_events_show, inode->i_private); +} + +static int mhi_debugfs_channels_open(struct inode *inode, struct file *fp) +{ + return single_open(fp, mhi_debugfs_channels_show, inode->i_private); +} + +static int mhi_debugfs_votes_open(struct inode *inode, struct file *fp) +{ + return single_open(fp, mhi_debugfs_votes_show, inode->i_private); +} + +static int mhi_debugfs_bus_vote_open(struct inode *inode, struct file *fp) +{ + return single_open(fp, mhi_debugfs_bus_vote_show, inode->i_private); +} + +static int mhi_debugfs_device_vote_open(struct inode *inode, struct file *fp) +{ + return single_open(fp, mhi_debugfs_device_vote_show, inode->i_private); +} + +static int mhi_debugfs_timeout_ms_open(struct inode *inode, struct file *fp) +{ + return single_open(fp, mhi_debugfs_timeout_ms_show, inode->i_private); +} + +static const struct file_operations debugfs_states_fops = { + .open = mhi_debugfs_states_open, + .release = single_release, + .read = seq_read, +}; + +static const struct file_operations debugfs_events_fops = { + .open = mhi_debugfs_events_open, + .release = single_release, + .read = seq_read, +}; + +static const struct file_operations debugfs_channels_fops = { + .open = mhi_debugfs_channels_open, + .release = single_release, + .read = seq_read, +}; + +static const struct file_operations debugfs_votes_fops = { + .open = mhi_debugfs_votes_open, + .release = single_release, + .read = seq_read, +}; + +static const struct file_operations debugfs_bus_vote_fops = { + .open = mhi_debugfs_bus_vote_open, + .write = mhi_debugfs_bus_vote_write, + .release = single_release, + .read = seq_read, +}; + +static const struct file_operations debugfs_device_vote_fops = { + .open = mhi_debugfs_device_vote_open, + .write = mhi_debugfs_device_vote_write, + .release = single_release, + .read = seq_read, +}; + +static const struct file_operations debugfs_timeout_ms_fops = { + .open = mhi_debugfs_timeout_ms_open, + .write = mhi_debugfs_timeout_ms_write, + .release = single_release, + .read = seq_read, +}; + +DEFINE_DEBUGFS_ATTRIBUTE(debugfs_reset_fops, NULL, + mhi_debugfs_trigger_reset, "%llu\n"); + +static struct dentry *mhi_debugfs_root; + +void mhi_create_debugfs(struct mhi_controller *mhi_cntrl) +{ + if (IS_ERR_OR_NULL(mhi_debugfs_root)) + return; + + mhi_cntrl->debugfs_dentry = + debugfs_create_dir(dev_name(mhi_cntrl->cntrl_dev), + mhi_debugfs_root); + if (IS_ERR_OR_NULL(mhi_cntrl->debugfs_dentry)) + return; + + debugfs_create_file("states", 0444, mhi_cntrl->debugfs_dentry, + mhi_cntrl, &debugfs_states_fops); + debugfs_create_file("events", 0444, mhi_cntrl->debugfs_dentry, + mhi_cntrl, &debugfs_events_fops); + debugfs_create_file("channels", 0444, mhi_cntrl->debugfs_dentry, + mhi_cntrl, &debugfs_channels_fops); + debugfs_create_file("votes", 0444, mhi_cntrl->debugfs_dentry, + mhi_cntrl, &debugfs_votes_fops); + debugfs_create_file("bus_vote", 0644, mhi_cntrl->debugfs_dentry, + mhi_cntrl, &debugfs_bus_vote_fops); + debugfs_create_file("device_vote", 0644, mhi_cntrl->debugfs_dentry, + mhi_cntrl, &debugfs_device_vote_fops); + debugfs_create_file("timeout_ms", 0644, mhi_cntrl->debugfs_dentry, + mhi_cntrl, &debugfs_timeout_ms_fops); + debugfs_create_file("reset", 0444, mhi_cntrl->debugfs_dentry, + mhi_cntrl, &debugfs_reset_fops); +} + +void mhi_destroy_debugfs(struct mhi_controller *mhi_cntrl) +{ + debugfs_remove_recursive(mhi_cntrl->debugfs_dentry); + mhi_cntrl->debugfs_dentry = NULL; +} + +void mhi_debugfs_init(void) +{ + mhi_debugfs_root = debugfs_create_dir(mhi_bus_type.name, NULL); +} + +void mhi_debugfs_exit(void) +{ + debugfs_remove_recursive(mhi_debugfs_root); +} diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c index da94a04..17e3f7d 100644 --- a/drivers/bus/mhi/core/init.c +++ b/drivers/bus/mhi/core/init.c @@ -4,6 +4,7 @@ * */ +#include #include #include #include @@ -914,6 +915,8 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl, mhi_cntrl->mhi_dev = mhi_dev; + mhi_create_debugfs(mhi_cntrl); + return 0; error_add_dev: @@ -936,6 +939,8 @@ void mhi_unregister_controller(struct mhi_controller *mhi_cntrl) struct mhi_chan *mhi_chan = mhi_cntrl->mhi_chan; unsigned int i; + mhi_destroy_debugfs(mhi_cntrl); + kfree(mhi_cntrl->mhi_cmd); kfree(mhi_cntrl->mhi_event); @@ -1285,11 +1290,13 @@ struct bus_type mhi_bus_type = { static int __init mhi_init(void) { + mhi_debugfs_init(); return bus_register(&mhi_bus_type); } static void __exit mhi_exit(void) { + mhi_debugfs_exit(); bus_unregister(&mhi_bus_type); } diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h index 2f18be7..798aa483 100644 --- a/drivers/bus/mhi/core/internal.h +++ b/drivers/bus/mhi/core/internal.h @@ -570,6 +570,30 @@ struct mhi_chan { /* Default MHI timeout */ #define MHI_TIMEOUT_MS (1000) +/* debugfs related functions */ +#ifdef CONFIG_MHI_BUS_DEBUG +void mhi_create_debugfs(struct mhi_controller *mhi_cntrl); +void mhi_destroy_debugfs(struct mhi_controller *mhi_cntrl); +void mhi_debugfs_init(void); +void mhi_debugfs_exit(void); +#else +static inline void mhi_create_debugfs(struct mhi_controller *mhi_cntrl) +{ +} + +static inline void mhi_destroy_debugfs(struct mhi_controller *mhi_cntrl) +{ +} + +static inline void mhi_debugfs_init(void) +{ +} + +static inline void mhi_debugfs_exit(void) +{ +} +#endif + struct mhi_device *mhi_alloc_device(struct mhi_controller *mhi_cntrl); int mhi_destroy_device(struct device *dev, void *data); diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c index 0b68dcd..29d6cd7 100644 --- a/drivers/bus/mhi/core/pm.c +++ b/drivers/bus/mhi/core/pm.c @@ -256,6 +256,7 @@ int mhi_pm_m0_transition(struct mhi_controller *mhi_cntrl) dev_err(dev, "Unable to transition to M0 state\n"); return -EIO; } + mhi_cntrl->M0++; /* Wake up the device */ read_lock_bh(&mhi_cntrl->pm_lock); @@ -326,6 +327,8 @@ void mhi_pm_m1_transition(struct mhi_controller *mhi_cntrl) mhi_cntrl->dev_state = MHI_STATE_M2; write_unlock_irq(&mhi_cntrl->pm_lock); + + mhi_cntrl->M2++; wake_up_all(&mhi_cntrl->state_event); /* If there are any pending resources, exit M2 immediately */ @@ -362,6 +365,7 @@ int mhi_pm_m3_transition(struct mhi_controller *mhi_cntrl) return -EIO; } + mhi_cntrl->M3++; wake_up_all(&mhi_cntrl->state_event); return 0; diff --git a/include/linux/mhi.h b/include/linux/mhi.h index 9b7bf28..026a624 100644 --- a/include/linux/mhi.h +++ b/include/linux/mhi.h @@ -291,6 +291,7 @@ struct mhi_controller_config { * @cntrl_dev: Pointer to the struct device of physical bus acting as the MHI * controller (required) * @mhi_dev: MHI device instance for the controller + * @debugfs_dentry: MHI controller debugfs directory * @regs: Base address of MHI MMIO register space (required) * @bhi: Points to base of MHI BHI register space * @bhie: Points to base of MHI BHIe register space @@ -329,6 +330,7 @@ struct mhi_controller_config { * @dev_state: MHI device state * @dev_wake: Device wakeup count * @pending_pkts: Pending packets for the controller + * @M0, M2, M3, M3_fast: Counters to track number of device MHI state changes * @transition_list: List of MHI state transitions * @transition_lock: Lock for protecting MHI state transition list * @wlock: Lock for protecting device wakeup @@ -367,6 +369,7 @@ struct mhi_controller_config { struct mhi_controller { struct device *cntrl_dev; struct mhi_device *mhi_dev; + struct dentry *debugfs_dentry; void __iomem *regs; void __iomem *bhi; void __iomem *bhie; @@ -408,6 +411,7 @@ struct mhi_controller { enum mhi_state dev_state; atomic_t dev_wake; atomic_t pending_pkts; + u32 M0, M2, M3, M3_fast; struct list_head transition_list; spinlock_t transition_lock; spinlock_t wlock;