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Date: Wed, 1 Jul 2020 19:42:00 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: "Ardelean, Alexandru" <alexandru.Ardelean@...log.com>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
"lars@...afoo.de" <lars@...afoo.de>,
"pmeerw@...erw.net" <pmeerw@...erw.net>,
"knaack.h@....de" <knaack.h@....de>
Subject: Re: [PATCH v4 4/7] iio: core: move debugfs data on the private iio
dev info
On Tue, 30 Jun 2020 04:58:06 +0000
"Ardelean, Alexandru" <alexandru.Ardelean@...log.com> wrote:
> On Tue, 2020-06-30 at 07:57 +0300, Alexandru Ardelean wrote:
> > This change moves all iio_dev debugfs fields to the iio_dev_priv object.
> > It's not the biggest advantage yet (to the whole thing of
> > abstractization)
> > but it's a start.
> >
> > The iio_get_debugfs_dentry() function (which is moved in
> > industrialio-core.c) needs to also be guarded against the CONFIG_DEBUG_FS
> > symbol, when it isn't defined. We do want to keep the inline definition
> > in
> > the iio.h header, so that the compiler can better infer when to compile
> > out
> > debugfs code that is related to the IIO debugfs directory.
> >
>
> Well, pretty much only this patch changed since V3.
> I thought about maybe re-doing just this patch, then I thought maybe I'd
> get a minor complaint that I should re-send the series.
>
> Either way, I prefer a complaint on this V4 series-re-send than if I were
> to have re-sent just this patch.
Either way worked.
However this doesn't pass my basic build test. Config condition
is reversed.
Fixed up and pushed out as testing.
Jonathan
>
>
> > Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
> > ---
> > drivers/iio/industrialio-core.c | 46 +++++++++++++++++++++++----------
> > include/linux/iio/iio-opaque.h | 10 +++++++
> > include/linux/iio/iio.h | 13 +---------
> > 3 files changed, 44 insertions(+), 25 deletions(-)
> >
> > diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-
> > core.c
> > index 27005ba4d09c..64174052641a 100644
> > --- a/drivers/iio/industrialio-core.c
> > +++ b/drivers/iio/industrialio-core.c
> > @@ -165,6 +165,19 @@ static const char * const iio_chan_info_postfix[] =
> > {
> > [IIO_CHAN_INFO_THERMOCOUPLE_TYPE] = "thermocouple_type",
> > };
> >
> > +#if !defined(CONFIG_DEBUG_FS)
Don't we want this if it is defined.
> > +/**
> > + * There's also a CONFIG_DEBUG_FS guard in include/linux/iio/iio.h for
> > + * iio_get_debugfs_dentry() to make it inline if CONFIG_DEBUG_FS is
> > undefined
> > + */
> > +struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev)
> > +{
> > + struct iio_dev_opaque *iio_dev_opaque =
> > to_iio_dev_opaque(indio_dev);
> > + return iio_dev_opaque->debugfs_dentry;
> > +}
> > +EXPORT_SYMBOL_GPL(iio_get_debugfs_dentry);
> > +#endif
> > +
> > /**
> > * iio_find_channel_from_si() - get channel from its scan index
> > * @indio_dev: device
> > @@ -308,35 +321,37 @@ static ssize_t iio_debugfs_read_reg(struct file
> > *file, char __user *userbuf,
> > size_t count, loff_t *ppos)
> > {
> > struct iio_dev *indio_dev = file->private_data;
> > + struct iio_dev_opaque *iio_dev_opaque =
> > to_iio_dev_opaque(indio_dev);
> > unsigned val = 0;
> > int ret;
> >
> > if (*ppos > 0)
> > return simple_read_from_buffer(userbuf, count, ppos,
> > - indio_dev->read_buf,
> > - indio_dev->read_buf_len);
> > + iio_dev_opaque->read_buf,
> > + iio_dev_opaque-
> > >read_buf_len);
> >
> > ret = indio_dev->info->debugfs_reg_access(indio_dev,
> > - indio_dev-
> > >cached_reg_addr,
> > + iio_dev_opaque-
> > >cached_reg_addr,
> > 0, &val);
> > if (ret) {
> > dev_err(indio_dev->dev.parent, "%s: read failed\n",
> > __func__);
> > return ret;
> > }
> >
> > - indio_dev->read_buf_len = snprintf(indio_dev->read_buf,
> > - sizeof(indio_dev->read_buf),
> > - "0x%X\n", val);
> > + iio_dev_opaque->read_buf_len = snprintf(iio_dev_opaque->read_buf,
> > + sizeof(iio_dev_opaque-
> > >read_buf),
> > + "0x%X\n", val);
> >
> > return simple_read_from_buffer(userbuf, count, ppos,
> > - indio_dev->read_buf,
> > - indio_dev->read_buf_len);
> > + iio_dev_opaque->read_buf,
> > + iio_dev_opaque->read_buf_len);
> > }
> >
> > static ssize_t iio_debugfs_write_reg(struct file *file,
> > const char __user *userbuf, size_t count, loff_t
> > *ppos)
> > {
> > struct iio_dev *indio_dev = file->private_data;
> > + struct iio_dev_opaque *iio_dev_opaque =
> > to_iio_dev_opaque(indio_dev);
> > unsigned reg, val;
> > char buf[80];
> > int ret;
> > @@ -351,10 +366,10 @@ static ssize_t iio_debugfs_write_reg(struct file
> > *file,
> >
> > switch (ret) {
> > case 1:
> > - indio_dev->cached_reg_addr = reg;
> > + iio_dev_opaque->cached_reg_addr = reg;
> > break;
> > case 2:
> > - indio_dev->cached_reg_addr = reg;
> > + iio_dev_opaque->cached_reg_addr = reg;
> > ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
> > val, NULL);
> > if (ret) {
> > @@ -378,23 +393,28 @@ static const struct file_operations
> > iio_debugfs_reg_fops = {
> >
> > static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
> > {
> > - debugfs_remove_recursive(indio_dev->debugfs_dentry);
> > + struct iio_dev_opaque *iio_dev_opaque =
> > to_iio_dev_opaque(indio_dev);
> > + debugfs_remove_recursive(iio_dev_opaque->debugfs_dentry);
> > }
> >
> > static void iio_device_register_debugfs(struct iio_dev *indio_dev)
> > {
> > + struct iio_dev_opaque *iio_dev_opaque;
> > +
> > if (indio_dev->info->debugfs_reg_access == NULL)
> > return;
> >
> > if (!iio_debugfs_dentry)
> > return;
> >
> > - indio_dev->debugfs_dentry =
> > + iio_dev_opaque = to_iio_dev_opaque(indio_dev);
> > +
> > + iio_dev_opaque->debugfs_dentry =
> > debugfs_create_dir(dev_name(&indio_dev->dev),
> > iio_debugfs_dentry);
> >
> > debugfs_create_file("direct_reg_access", 0644,
> > - indio_dev->debugfs_dentry, indio_dev,
> > + iio_dev_opaque->debugfs_dentry, indio_dev,
> > &iio_debugfs_reg_fops);
> > }
> > #else
> > diff --git a/include/linux/iio/iio-opaque.h b/include/linux/iio/iio-
> > opaque.h
> > index 1375674f14cd..b3f234b4c1e9 100644
> > --- a/include/linux/iio/iio-opaque.h
> > +++ b/include/linux/iio/iio-opaque.h
> > @@ -6,9 +6,19 @@
> > /**
> > * struct iio_dev_opaque - industrial I/O device opaque information
> > * @indio_dev: public industrial I/O device
> > information
> > + * @debugfs_dentry: device specific debugfs dentry
> > + * @cached_reg_addr: cached register address for debugfs reads
> > + * @read_buf: read buffer to be used for the
> > initial reg read
> > + * @read_buf_len: data length in @read_buf
> > */
> > struct iio_dev_opaque {
> > struct iio_dev indio_dev;
> > +#if defined(CONFIG_DEBUG_FS)
> > + struct dentry *debugfs_dentry;
> > + unsigned cached_reg_addr;
> > + char read_buf[20];
> > + unsigned int read_buf_len;
> > +#endif
> > };
> >
> > #define to_iio_dev_opaque(indio_dev) \
> > diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
> > index 86112e35ae5f..bb0aae11a111 100644
> > --- a/include/linux/iio/iio.h
> > +++ b/include/linux/iio/iio.h
> > @@ -520,8 +520,6 @@ struct iio_buffer_setup_ops {
> > * @groups: [INTERN] attribute groups
> > * @groupcounter: [INTERN] index of next attribute group
> > * @flags: [INTERN] file ops related flags including busy
> > flag.
> > - * @debugfs_dentry: [INTERN] device specific debugfs dentry.
> > - * @cached_reg_addr: [INTERN] cached register address for debugfs reads.
> > * @priv: [DRIVER] reference to driver's private information
> > * **MUST** be accessed **ONLY** via iio_priv() helper
> > */
> > @@ -567,12 +565,6 @@ struct iio_dev {
> > int groupcounter;
> >
> > unsigned long flags;
> > -#if defined(CONFIG_DEBUG_FS)
> > - struct dentry *debugfs_dentry;
> > - unsigned cached_reg_addr;
> > - char read_buf[20];
> > - unsigned int read_buf_len;
> > -#endif
> > void *priv;
> > };
> >
> > @@ -727,10 +719,7 @@ static inline bool iio_buffer_enabled(struct iio_dev
> > *indio_dev)
> > * @indio_dev: IIO device structure for device
> > **/
> > #if defined(CONFIG_DEBUG_FS)
> > -static inline struct dentry *iio_get_debugfs_dentry(struct iio_dev
> > *indio_dev)
> > -{
> > - return indio_dev->debugfs_dentry;
> > -}
> > +struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev);
> > #else
> > static inline struct dentry *iio_get_debugfs_dentry(struct iio_dev
> > *indio_dev)
> > {
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