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cdx: Create resource debugfs file for cdx device

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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: Abhijit Gangurde <abhijit.gangurde@amd.com>
Link: https://lore.kernel.org/r/20231222064627.2828960-2-abhijit.gangurde@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Abhijit Gangurde 2023-12-22 12:16:27 +05:30 committed by Greg Kroah-Hartman
parent aeda33ab81
commit cf60af04ed
2 changed files with 40 additions and 1 deletions
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39
drivers/cdx/cdx.c
View File

@ -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);

2
include/linux/cdx/cdx_bus.h
View File

@ -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;