Commit cf60af04 authored by Abhijit Gangurde's avatar Abhijit Gangurde Committed by Greg Kroah-Hartman
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cdx: Create resource debugfs file for cdx device 



resource debugfs file contains host addresses of CDX device resources.
Each line of the resource file describe type of resource, a region
with start-end and flag fields.

Signed-off-by: default avatarAbhijit Gangurde <abhijit.gangurde@amd.com>
Link: https://lore.kernel.org/r/20231222064627.2828960-2-abhijit.gangurde@amd.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent aeda33ab

drivers/cdx/cdx.c

+38 −1
Original line number Diff line number Diff line
@@ -67,6 +67,7 @@ 
#include <linux/cdx/cdx_bus.h>

#include <linux/iommu.h>

#include <linux/dma-map-ops.h>

#include <linux/debugfs.h>

#include "cdx.h"



/* Default DMA mask for devices on a CDX bus */
@@ -77,6 +78,8 @@ 
static DEFINE_IDA(cdx_controller_ida);

/* Lock to protect controller ops */

static DEFINE_MUTEX(cdx_controller_lock);

/* Debugfs dir for cdx bus */

static struct dentry *cdx_debugfs_dir;



static char *compat_node_name = "xlnx,versal-net-cdx";
@@ -151,6 +154,7 @@ static int cdx_unregister_device(struct device *dev, 
			cdx->ops->bus_disable(cdx, cdx_dev->bus_num);

	} else {

		cdx_destroy_res_attr(cdx_dev, MAX_CDX_DEV_RESOURCES);

		debugfs_remove_recursive(cdx_dev->debugfs_dir);

		kfree(cdx_dev->driver_override);

		cdx_dev->driver_override = NULL;

	}
@@ -554,6 +558,31 @@ static const struct attribute_group *cdx_dev_groups[] = { 
	NULL,

};



static int cdx_debug_resource_show(struct seq_file *s, void *data)

{

	struct cdx_device *cdx_dev = s->private;

	int i;



	for (i = 0; i < MAX_CDX_DEV_RESOURCES; i++) {

		struct resource *res =  &cdx_dev->res[i];



		seq_printf(s, "%pr\n", res);

	}



	return 0;

}

DEFINE_SHOW_ATTRIBUTE(cdx_debug_resource);



static void cdx_device_debugfs_init(struct cdx_device *cdx_dev)

{

	cdx_dev->debugfs_dir = debugfs_create_dir(dev_name(&cdx_dev->dev), cdx_debugfs_dir);

	if (IS_ERR(cdx_dev->debugfs_dir))

		return;



	debugfs_create_file("resource", 0444, cdx_dev->debugfs_dir, cdx_dev,

			    &cdx_debug_resource_fops);

}



static ssize_t rescan_store(const struct bus_type *bus,

			    const char *buf, size_t count)

{
@@ -803,6 +832,8 @@ int cdx_device_add(struct cdx_dev_params *dev_params) 
		}

	}



	cdx_device_debugfs_init(cdx_dev);



	return 0;

resource_create_fail:

	cdx_destroy_res_attr(cdx_dev, i);
@@ -907,6 +938,12 @@ EXPORT_SYMBOL_NS_GPL(cdx_unregister_controller, CDX_BUS_CONTROLLER); 


static int __init cdx_bus_init(void)

{

	return bus_register(&cdx_bus_type);

	int ret;



	ret = bus_register(&cdx_bus_type);

	if (!ret)

		cdx_debugfs_dir = debugfs_create_dir(cdx_bus_type.name, NULL);



	return ret;

}

postcore_initcall(cdx_bus_init);

include/linux/cdx/cdx_bus.h

+2 −0
Original line number Diff line number Diff line
@@ -113,6 +113,7 @@ struct cdx_controller { 
 * @dev_num: Device number for this device

 * @res: array of MMIO region entries

 * @res_attr: resource binary attribute

 * @debugfs_dir: debugfs directory for this device

 * @res_count: number of valid MMIO regions

 * @dma_mask: Default DMA mask

 * @flags: CDX device flags
@@ -136,6 +137,7 @@ struct cdx_device { 
	u8 dev_num;

	struct resource res[MAX_CDX_DEV_RESOURCES];

	struct bin_attribute *res_attr[MAX_CDX_DEV_RESOURCES];

	struct dentry *debugfs_dir;

	u8 res_count;

	u64 dma_mask;

	u16 flags;