* [PATCH v1 1/6] bus: mhi: core: Introduce independent voting mechanism
2020-05-12 2:33 [PATCH v1 0/6] Introduce features and debugfs/sysfs entries for MHI Bhaumik Bhatt
@ 2020-05-12 2:33 ` Bhaumik Bhatt
2020-05-12 2:33 ` [PATCH vq 2/6] bus: mhi: core: Use generic name field for an MHI device Bhaumik Bhatt
` (4 subsequent siblings)
5 siblings, 0 replies; 8+ messages in thread
From: Bhaumik Bhatt @ 2020-05-12 2:33 UTC (permalink / raw)
To: manivannan.sadhasivam
Cc: linux-arm-msm, linux-kernel, hemantk, jhugo, Bhaumik Bhatt
Allow independent votes from clients such that they can choose to vote
for either the device or the bus or both. This helps in cases where the
device supports autonomous low power mode wherein it can move to M2
state without the need to notify the host. Clients can also vote only to
keep the underlying bus active without having the device in M0 state to
support offload use cases.
Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
---
drivers/bus/mhi/core/init.c | 15 +++++----
drivers/bus/mhi/core/pm.c | 75 ++++++++++++++++++++++++++++++++-------------
include/linux/mhi.h | 21 ++++++++-----
3 files changed, 77 insertions(+), 34 deletions(-)
diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
index 12207cc..d5bebe5 100644
--- a/drivers/bus/mhi/core/init.c
+++ b/drivers/bus/mhi/core/init.c
@@ -1061,7 +1061,8 @@ struct mhi_device *mhi_alloc_device(struct mhi_controller *mhi_cntrl)
dev->release = mhi_release_device;
dev->parent = mhi_cntrl->cntrl_dev;
mhi_dev->mhi_cntrl = mhi_cntrl;
- mhi_dev->dev_wake = 0;
+ atomic_set(&mhi_dev->dev_vote, 0);
+ atomic_set(&mhi_dev->bus_vote, 0);
return mhi_dev;
}
@@ -1078,7 +1079,7 @@ static int mhi_driver_probe(struct device *dev)
int ret;
/* Bring device out of LPM */
- ret = mhi_device_get_sync(mhi_dev);
+ ret = mhi_device_get_sync(mhi_dev, MHI_VOTE_DEVICE);
if (ret)
return ret;
@@ -1137,14 +1138,14 @@ static int mhi_driver_probe(struct device *dev)
if (dl_chan && dl_chan->auto_start)
mhi_prepare_channel(mhi_cntrl, dl_chan);
- mhi_device_put(mhi_dev);
+ mhi_device_put(mhi_dev, MHI_VOTE_DEVICE);
return ret;
exit_probe:
mhi_unprepare_from_transfer(mhi_dev);
- mhi_device_put(mhi_dev);
+ mhi_device_put(mhi_dev, MHI_VOTE_DEVICE);
return ret;
}
@@ -1213,8 +1214,10 @@ static int mhi_driver_remove(struct device *dev)
}
read_lock_bh(&mhi_cntrl->pm_lock);
- while (mhi_dev->dev_wake)
- mhi_device_put(mhi_dev);
+ while (atomic_read(&mhi_dev->dev_vote))
+ mhi_device_put(mhi_dev, MHI_VOTE_DEVICE);
+ while (atomic_read(&mhi_dev->bus_vote))
+ mhi_device_put(mhi_dev, MHI_VOTE_BUS);
read_unlock_bh(&mhi_cntrl->pm_lock);
return 0;
diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
index de5abb2..0b68dcd 100644
--- a/drivers/bus/mhi/core/pm.c
+++ b/drivers/bus/mhi/core/pm.c
@@ -675,7 +675,8 @@ void mhi_pm_st_worker(struct work_struct *work)
int mhi_pm_suspend(struct mhi_controller *mhi_cntrl)
{
struct mhi_chan *itr, *tmp;
- struct device *dev = &mhi_cntrl->mhi_dev->dev;
+ struct mhi_device *mhi_dev = mhi_cntrl->mhi_dev;
+ struct device *dev = &mhi_dev->dev;
enum mhi_pm_state new_state;
int ret;
@@ -686,7 +687,8 @@ int mhi_pm_suspend(struct mhi_controller *mhi_cntrl)
return -EIO;
/* Return busy if there are any pending resources */
- if (atomic_read(&mhi_cntrl->dev_wake))
+ if (atomic_read(&mhi_cntrl->dev_wake) ||
+ atomic_read(&mhi_dev->bus_vote))
return -EBUSY;
/* Take MHI out of M2 state */
@@ -712,10 +714,9 @@ int mhi_pm_suspend(struct mhi_controller *mhi_cntrl)
write_lock_irq(&mhi_cntrl->pm_lock);
- if (atomic_read(&mhi_cntrl->dev_wake)) {
- write_unlock_irq(&mhi_cntrl->pm_lock);
+ if (atomic_read(&mhi_cntrl->dev_wake) ||
+ atomic_read(&mhi_dev->bus_vote))
return -EBUSY;
- }
dev_info(dev, "Allowing M3 transition\n");
new_state = mhi_tryset_pm_state(mhi_cntrl, MHI_PM_M3_ENTER);
@@ -1080,42 +1081,74 @@ int mhi_force_rddm_mode(struct mhi_controller *mhi_cntrl)
}
EXPORT_SYMBOL_GPL(mhi_force_rddm_mode);
-void mhi_device_get(struct mhi_device *mhi_dev)
+void mhi_device_get(struct mhi_device *mhi_dev, int vote)
{
struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl;
- mhi_dev->dev_wake++;
- read_lock_bh(&mhi_cntrl->pm_lock);
- mhi_cntrl->wake_get(mhi_cntrl, true);
- read_unlock_bh(&mhi_cntrl->pm_lock);
+ if (vote & MHI_VOTE_DEVICE) {
+ atomic_inc(&mhi_dev->dev_vote);
+ read_lock_bh(&mhi_cntrl->pm_lock);
+ mhi_cntrl->wake_get(mhi_cntrl, true);
+ read_unlock_bh(&mhi_cntrl->pm_lock);
+ }
+
+ if (vote & MHI_VOTE_BUS) {
+ atomic_inc(&mhi_dev->bus_vote);
+ mhi_cntrl->runtime_get(mhi_cntrl);
+ }
}
EXPORT_SYMBOL_GPL(mhi_device_get);
-int mhi_device_get_sync(struct mhi_device *mhi_dev)
+int mhi_device_get_sync(struct mhi_device *mhi_dev, int vote)
{
struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl;
int ret;
+ /* bring device out of low power modes regardless of the type of vote */
ret = __mhi_device_get_sync(mhi_cntrl);
- if (!ret)
- mhi_dev->dev_wake++;
+ if (ret)
+ return ret;
+
+ if (vote & MHI_VOTE_DEVICE) {
+ atomic_inc(&mhi_dev->dev_vote);
+ } else {
+ /* remove device vote as it was not requested */
+ read_lock_bh(&mhi_cntrl->pm_lock);
+ mhi_cntrl->wake_put(mhi_cntrl, false);
+ read_unlock_bh(&mhi_cntrl->pm_lock);
+ }
+
+ if (vote & MHI_VOTE_BUS) {
+ atomic_inc(&mhi_dev->bus_vote);
+ mhi_cntrl->runtime_get(mhi_cntrl);
+ }
return ret;
}
EXPORT_SYMBOL_GPL(mhi_device_get_sync);
-void mhi_device_put(struct mhi_device *mhi_dev)
+void mhi_device_put(struct mhi_device *mhi_dev, int vote)
{
struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl;
- mhi_dev->dev_wake--;
- read_lock_bh(&mhi_cntrl->pm_lock);
- if (MHI_PM_IN_SUSPEND_STATE(mhi_cntrl->pm_state)) {
- mhi_cntrl->runtime_get(mhi_cntrl);
- mhi_cntrl->runtime_put(mhi_cntrl);
+ if (vote & MHI_VOTE_DEVICE) {
+ atomic_dec(&mhi_dev->dev_vote);
+ read_lock_bh(&mhi_cntrl->pm_lock);
+ if (MHI_PM_IN_SUSPEND_STATE(mhi_cntrl->pm_state)) {
+ mhi_cntrl->runtime_get(mhi_cntrl);
+ mhi_cntrl->runtime_put(mhi_cntrl);
+ }
+ mhi_cntrl->wake_put(mhi_cntrl, false);
+ read_unlock_bh(&mhi_cntrl->pm_lock);
}
- mhi_cntrl->wake_put(mhi_cntrl, false);
- read_unlock_bh(&mhi_cntrl->pm_lock);
+ if (vote & MHI_VOTE_BUS) {
+ atomic_dec(&mhi_dev->bus_vote);
+ mhi_cntrl->runtime_put(mhi_cntrl);
+
+ /* notify controller that all bus votes are removed */
+ if (!atomic_read(&mhi_dev->bus_vote))
+ mhi_cntrl->status_cb(mhi_cntrl, MHI_CB_IDLE);
+ }
}
EXPORT_SYMBOL_GPL(mhi_device_put);
diff --git a/include/linux/mhi.h b/include/linux/mhi.h
index b008914..10fcb52 100644
--- a/include/linux/mhi.h
+++ b/include/linux/mhi.h
@@ -16,6 +16,9 @@
#include <linux/wait.h>
#include <linux/workqueue.h>
+#define MHI_VOTE_BUS BIT(0) /* do not disable the mhi bus */
+#define MHI_VOTE_DEVICE BIT(1) /* prevent mhi device from entering lpm */
+
struct mhi_chan;
struct mhi_event;
struct mhi_ctxt;
@@ -459,7 +462,8 @@ struct mhi_device {
enum mhi_device_type dev_type;
int ul_chan_id;
int dl_chan_id;
- u32 dev_wake;
+ atomic_t dev_vote;
+ atomic_t bus_vote;
};
/**
@@ -644,23 +648,26 @@ void mhi_set_mhi_state(struct mhi_controller *mhi_cntrl,
enum mhi_state mhi_get_mhi_state(struct mhi_controller *mhi_cntrl);
/**
- * mhi_device_get - Disable device low power mode
+ * mhi_device_get - Disable device and/or bus low power mode
* @mhi_dev: Device associated with the channel
+ * @vote: requested vote (bus, device or both)
*/
-void mhi_device_get(struct mhi_device *mhi_dev);
+void mhi_device_get(struct mhi_device *mhi_dev, int vote);
/**
- * mhi_device_get_sync - Disable device low power mode. Synchronously
+ * mhi_device_get_sync - Disable device and/or bus low power mode. Synchronously
* take the controller out of suspended state
* @mhi_dev: Device associated with the channel
+ * @vote: requested vote (bus, device or both)
*/
-int mhi_device_get_sync(struct mhi_device *mhi_dev);
+int mhi_device_get_sync(struct mhi_device *mhi_dev, int vote);
/**
- * mhi_device_put - Re-enable device low power mode
+ * mhi_device_put - Re-enable device and/or bus low power mode
* @mhi_dev: Device associated with the channel
+ * @vote: vote(s) to remove (bus, device or both)
*/
-void mhi_device_put(struct mhi_device *mhi_dev);
+void mhi_device_put(struct mhi_device *mhi_dev, int vote);
/**
* mhi_prepare_for_transfer - Setup channel for data transfer
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
^ permalink raw reply related [flat|nested] 8+ messages in thread* [PATCH v1 4/6] bus: mhi: core: Introduce debugfs entries and counters for MHI
2020-05-12 2:33 [PATCH v1 0/6] Introduce features and debugfs/sysfs entries for MHI Bhaumik Bhatt
` (2 preceding siblings ...)
2020-05-12 2:33 ` [PATCH v1 3/6] bus: mhi: core: Introduce helper function to check device state Bhaumik Bhatt
@ 2020-05-12 2:33 ` Bhaumik Bhatt
2020-05-12 2:33 ` [PATCH v1 5/6] bus: mhi: core: Read and save device hardware information from BHI Bhaumik Bhatt
2020-05-12 2:33 ` [PATCH v1 6/6] bus: mhi: core: Introduce sysfs entries for MHI Bhaumik Bhatt
5 siblings, 0 replies; 8+ messages in thread
From: Bhaumik Bhatt @ 2020-05-12 2:33 UTC (permalink / raw)
To: manivannan.sadhasivam
Cc: linux-arm-msm, linux-kernel, hemantk, jhugo, Bhaumik Bhatt
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 <bbhatt@codeaurora.org>
---
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 <linux/debugfs.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/mhi.h>
+#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 <linux/debugfs.h>
#include <linux/device.h>
#include <linux/dma-direction.h>
#include <linux/dma-mapping.h>
@@ -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;
--
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a Linux Foundation Collaborative Project
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