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SubjectRE: [PATCH v4 1/2] fpga: fpga-mgr: Add readback support
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Hi Alan,

Did you get a chance to send your framework changes to upstream?
@Moritz Fischer: If Alan couldn't send his patch series, Can we take this patch series??
Please let me know your thoughts on this.

Regards,
Kedar.
> On Fri, Jul 27, 2018 at 1:22 AM, Appana Durga Kedareswara rao
> <appana.durga.rao@xilinx.com> wrote:
>
> Hi Appana,
>
> There should be some documentation for the debugfs added under
> Documentation/driver-api/fpga/
>
> Also there are a lot of #ifdefs that were added due to the
> CONFIG_FPGA_MGR_DEBUG_FS. This has caused a kernel robot complaint.
> The way to fix that is to have a separate c file for the debugfs implementation.
> I see a lot of other kernel drivers have done it this way. I have an
> implementation that I haven't submitted yet, it exposes different functionality
> (exposing the image firmware file name and writing to the image file). It's on
> the downstream github.com/altera-opensource repo [1]. I'll clean this up and
> submit it to the mailing list, it may take a minute for me to get to that.
> Once that's done, your added functionality can be a patch on top of that.
>
> Alan
>
> [1] https://github.com/altera-opensource/linux-socfpga/blob/socfpga-
> 4.17/drivers/fpga/fpga-mgr-debugfs.c
> https://github.com/altera-opensource/linux-socfpga/blob/socfpga-
> 4.17/drivers/fpga/fpga-mgr-debugfs.h
>
>
> > Inorder to debug issues with fpga's users would like to read the fpga
> > configuration information.
> > This patch adds readback support for fpga configuration data in the
> > framework through debugfs interface.
> >
> > Usage:
> > cat /sys/kernel/debug/fpga/fpga0/image
> >
> > Signed-off-by: Appana Durga Kedareswara rao
> > <appana.durga.rao@xilinx.com>
> > ---
> > Changes for v4:
> > --> None.
> > Changes for v3:
> > --> None.
> > Changes for v2:
> > --> Fixed debug attribute path and name as suggested by Alan Add
> > --> config entry for DEBUG as suggested by Alan Fixed trival coding
> > --> style issues.
> >
> > drivers/fpga/Kconfig | 7 +++++
> > drivers/fpga/fpga-mgr.c | 68
> +++++++++++++++++++++++++++++++++++++++++++
> > include/linux/fpga/fpga-mgr.h | 5 ++++
> > 3 files changed, 80 insertions(+)
> >
> > diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig index
> > 53d3f55..838ad4e 100644
> > --- a/drivers/fpga/Kconfig
> > +++ b/drivers/fpga/Kconfig
> > @@ -11,6 +11,13 @@ menuconfig FPGA
> >
> > if FPGA
> >
> > +config FPGA_MGR_DEBUG_FS
> > + tristate "FPGA Debug fs"
> > + select DEBUG_FS
> > + help
> > + FPGA manager debug provides support for reading fpga configuration
> > + information.
> > +
> > config FPGA_MGR_SOCFPGA
> > tristate "Altera SOCFPGA FPGA Manager"
> > depends on ARCH_SOCFPGA || COMPILE_TEST diff --git
> > a/drivers/fpga/fpga-mgr.c b/drivers/fpga/fpga-mgr.c index
> > 9939d2c..4bea860 100644
> > --- a/drivers/fpga/fpga-mgr.c
> > +++ b/drivers/fpga/fpga-mgr.c
> > @@ -484,6 +484,48 @@ void fpga_mgr_put(struct fpga_manager *mgr) }
> > EXPORT_SYMBOL_GPL(fpga_mgr_put);
> >
> > +#ifdef CONFIG_FPGA_MGR_DEBUG_FS
> > +#include <linux/debugfs.h>
> > +
> > +static int fpga_mgr_read(struct seq_file *s, void *data) {
> > + struct fpga_manager *mgr = (struct fpga_manager *)s->private;
> > + int ret = 0;
> > +
> > + if (!mgr->mops->read)
> > + return -ENOENT;
> > +
> > + if (!mutex_trylock(&mgr->ref_mutex))
> > + return -EBUSY;
> > +
> > + if (mgr->state != FPGA_MGR_STATE_OPERATING) {
> > + ret = -EPERM;
> > + goto err_unlock;
> > + }
> > +
> > + /* Read the FPGA configuration data from the fabric */
> > + ret = mgr->mops->read(mgr, s);
> > + if (ret)
> > + dev_err(&mgr->dev, "Error while reading configuration
> > + data from FPGA\n");
> > +
> > +err_unlock:
> > + mutex_unlock(&mgr->ref_mutex);
> > +
> > + return ret;
> > +}
> > +
> > +static int fpga_mgr_read_open(struct inode *inode, struct file *file)
> > +{
> > + return single_open(file, fpga_mgr_read, inode->i_private); }
> > +
> > +static const struct file_operations fpga_mgr_ops_image = {
> > + .owner = THIS_MODULE,
> > + .open = fpga_mgr_read_open,
> > + .read = seq_read,
> > +};
> > +#endif
> > +
> > /**
> > * fpga_mgr_lock - Lock FPGA manager for exclusive use
> > * @mgr: fpga manager
> > @@ -581,6 +623,29 @@ int fpga_mgr_register(struct device *dev, const
> char *name,
> > if (ret)
> > goto error_device;
> >
> > +#ifdef CONFIG_FPGA_MGR_DEBUG_FS
> > + struct dentry *d, *parent;
> > +
> > + mgr->dir = debugfs_create_dir("fpga", NULL);
> > + if (!mgr->dir)
> > + goto error_device;
> > +
> > + parent = mgr->dir;
> > + d = debugfs_create_dir(mgr->dev.kobj.name, parent);
> > + if (!d) {
> > + debugfs_remove_recursive(parent);
> > + goto error_device;
> > + }
> > +
> > + parent = d;
> > + d = debugfs_create_file("image", 0644, parent, mgr,
> > + &fpga_mgr_ops_image);
> > + if (!d) {
> > + debugfs_remove_recursive(mgr->dir);
> > + goto error_device;
> > + }
> > +#endif
> > +
> > dev_info(&mgr->dev, "%s registered\n", mgr->name);
> >
> > return 0;
> > @@ -604,6 +669,9 @@ void fpga_mgr_unregister(struct device *dev)
> >
> > dev_info(&mgr->dev, "%s %s\n", __func__, mgr->name);
> >
> > +#ifdef CONFIG_FPGA_MGR_DEBUG_FS
> > + debugfs_remove_recursive(mgr->dir);
> > +#endif
> > /*
> > * If the low level driver provides a method for putting fpga into
> > * a desired state upon unregister, do it.
> > diff --git a/include/linux/fpga/fpga-mgr.h
> > b/include/linux/fpga/fpga-mgr.h index 3c6de23..e9e17a9 100644
> > --- a/include/linux/fpga/fpga-mgr.h
> > +++ b/include/linux/fpga/fpga-mgr.h
> > @@ -114,6 +114,7 @@ struct fpga_image_info {
> > * @write: write count bytes of configuration data to the FPGA
> > * @write_sg: write the scatter list of configuration data to the FPGA
> > * @write_complete: set FPGA to operating state after writing is done
> > + * @read: optional: read FPGA configuration information
> > * @fpga_remove: optional: Set FPGA into a specific state during driver
> remove
> > * @groups: optional attribute groups.
> > *
> > @@ -131,6 +132,7 @@ struct fpga_manager_ops {
> > int (*write_sg)(struct fpga_manager *mgr, struct sg_table *sgt);
> > int (*write_complete)(struct fpga_manager *mgr,
> > struct fpga_image_info *info);
> > + int (*read)(struct fpga_manager *mgr, struct seq_file *s);
> > void (*fpga_remove)(struct fpga_manager *mgr);
> > const struct attribute_group **groups; }; @@ -151,6 +153,9 @@
> > struct fpga_manager {
> > enum fpga_mgr_states state;
> > const struct fpga_manager_ops *mops;
> > void *priv;
> > +#ifdef CONFIG_FPGA_MGR_DEBUG_FS
> > + struct dentry *dir;
> > +#endif
> > };
> >
> > #define to_fpga_manager(d) container_of(d, struct fpga_manager, dev)
> > --
> > 2.7.4
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-fpga"
> > in the body of a message to majordomo@vger.kernel.org More majordomo
> > info at http://vger.kernel.org/majordomo-info.html
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