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mhi: core: add prints for votes and a debugfs vote entry

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Add a debugfs entry to print out votes from all the MHI client
devices.

Change-Id: I6391aee59a4a4e560cfb0bd16e83bf146c19c081
Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
This commit is contained in:
Bhaumik Bhatt 2020-01-29 16:41:13 -08:00 • committed by Gerrit - the friendly Code Review server
commit 0179be9121
3 changed files with 57 additions and 0 deletions
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13
drivers/bus/mhi/core/mhi_init.c
View file

@ -354,6 +354,11 @@ static int mhi_init_debugfs_mhi_chan_open(struct inode *inode, struct file *fp)
return single_open(fp, mhi_debugfs_mhi_chan_show, inode->i_private);
}
static int mhi_init_debugfs_mhi_vote_open(struct inode *inode, struct file *fp)
{
return single_open(fp, mhi_debugfs_mhi_vote_show, inode->i_private);
}
static const struct file_operations debugfs_state_ops = {
.open = mhi_init_debugfs_mhi_states_open,
.release = single_release,
@ -372,6 +377,12 @@ static const struct file_operations debugfs_chan_ops = {
.read = seq_read,
};
static const struct file_operations debugfs_vote_ops = {
.open = mhi_init_debugfs_mhi_vote_open,
.release = single_release,
.read = seq_read,
};
DEFINE_DEBUGFS_ATTRIBUTE(debugfs_trigger_reset_fops, NULL,
mhi_debugfs_trigger_reset, "%llu\n");
@ -397,6 +408,8 @@ void mhi_init_debugfs(struct mhi_controller *mhi_cntrl)
&debugfs_ev_ops);
debugfs_create_file_unsafe("chan", 0444, dentry, mhi_cntrl,
&debugfs_chan_ops);
debugfs_create_file_unsafe("vote", 0444, dentry, mhi_cntrl,
&debugfs_vote_ops);
debugfs_create_file_unsafe("reset", 0444, dentry, mhi_cntrl,
&debugfs_trigger_reset_fops);
mhi_cntrl->dentry = dentry;

1
drivers/bus/mhi/core/mhi_internal.h
View file

@ -751,6 +751,7 @@ extern struct mhi_bus mhi_bus;
struct mhi_controller *find_mhi_controller_by_name(const char *name);
/* debug fs related functions */
int mhi_debugfs_mhi_vote_show(struct seq_file *m, void *d);
int mhi_debugfs_mhi_chan_show(struct seq_file *m, void *d);
int mhi_debugfs_mhi_event_show(struct seq_file *m, void *d);
int mhi_debugfs_mhi_states_show(struct seq_file *m, void *d);

43
drivers/bus/mhi/core/mhi_main.c
View file

@ -2249,6 +2249,49 @@ int mhi_debugfs_mhi_chan_show(struct seq_file *m, void *d)
return 0;
}
/* show bus/device votes for a specific device */
static int mhi_device_vote_show(struct device *dev, void *data)
{
struct mhi_device *mhi_dev;
struct mhi_controller *mhi_cntrl;
if (dev->bus != &mhi_bus_type)
return 0;
mhi_dev = to_mhi_device(dev);
mhi_cntrl = mhi_dev->mhi_cntrl;
/* we dont care about timesync or similar special devices */
if (mhi_dev->dev_type == MHI_TIMESYNC_TYPE)
return 0;
seq_printf((struct seq_file *)data, "%s: device:%u, bus:%u\n",
mhi_dev->chan_name, atomic_read(&mhi_dev->dev_vote),
atomic_read(&mhi_dev->bus_vote));
return 0;
}
int mhi_debugfs_mhi_vote_show(struct seq_file *m, void *d)
{
struct mhi_controller *mhi_cntrl = m->private;
struct mhi_device *mhi_dev;
if (!mhi_cntrl)
return 0;
mhi_dev = mhi_cntrl->mhi_dev;
seq_printf(m, "At %llu ns:\n", sched_clock());
seq_printf(m, "%s: device:%u, bus:%u\n", mhi_dev->chan_name,
atomic_read(&mhi_dev->dev_vote),
atomic_read(&mhi_dev->bus_vote));
device_for_each_child(mhi_cntrl->dev, m, mhi_device_vote_show);
return 0;
}
/* move channel to start state */
int mhi_prepare_for_transfer(struct mhi_device *mhi_dev)
{