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stmmac: export DMA TX/RX rings via debugfs (v3) 

This patch adds the following debugFs entry to dump the
RX/TX DMA rings:

/sys/kernel/debug/stmmaceth/descriptors_status

This is an example:

=======================
  RX descriptor ring
=======================
[0] DES0=0x85ee0320 DES1=0x1fff1fff BUF1=0x5fae2022 BUF2=0x0
[1] DES0=0x85ee0320 DES1=0x1fff1fff BUF1=0x5fae0022 BUF2=0x0
[2] DES0=0x81460320 DES1=0x1fff1fff BUF1=0x5f9dd022 BUF2=0x0

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Giuseppe CAVALLARO 2011-09-01 21:51:39 +00:00 committed by David S. Miller
parent 1c901a46d5
commit 7ac2905511
2 changed files with 112 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/net/ethernet/stmicro/stmmac/Kconfig
View File

@ -11,6 +11,13 @@ config STMMAC_ETH
if STMMAC_ETH
config STMMAC_DEBUG_FS
bool "Enable monitoring via sysFS "
default n
depends on STMMAC_ETH && DEBUG_FS
-- help
The stmmac entry in /sys reports DMA TX/RX rings.
config STMMAC_DA
bool "STMMAC DMA arbitration scheme"
default n

105
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
View File

@ -48,6 +48,10 @@
#include <linux/slab.h>
#include <linux/prefetch.h>
#include "stmmac.h"
#ifdef CONFIG_STMMAC_DEBUG_FS
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#endif
#define STMMAC_RESOURCE_NAME "stmmaceth"
@ -1425,6 +1429,96 @@ static int stmmac_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
return ret;
}
#ifdef CONFIG_STMMAC_DEBUG_FS
static struct dentry *stmmac_fs_dir;
static struct dentry *stmmac_rings_status;
static int stmmac_sysfs_ring_read(struct seq_file *seq, void *v)
{
struct tmp_s {
u64 a;
unsigned int b;
unsigned int c;
};
int i;
struct net_device *dev = seq->private;
struct stmmac_priv *priv = netdev_priv(dev);
seq_printf(seq, "=======================\n");
seq_printf(seq, " RX descriptor ring\n");
seq_printf(seq, "=======================\n");
for (i = 0; i < priv->dma_rx_size; i++) {
struct tmp_s *x = (struct tmp_s *)(priv->dma_rx + i);
seq_printf(seq, "[%d] DES0=0x%x DES1=0x%x BUF1=0x%x BUF2=0x%x",
i, (unsigned int)(x->a),
(unsigned int)((x->a) >> 32), x->b, x->c);
seq_printf(seq, "\n");
}
seq_printf(seq, "\n");
seq_printf(seq, "=======================\n");
seq_printf(seq, " TX descriptor ring\n");
seq_printf(seq, "=======================\n");
for (i = 0; i < priv->dma_tx_size; i++) {
struct tmp_s *x = (struct tmp_s *)(priv->dma_tx + i);
seq_printf(seq, "[%d] DES0=0x%x DES1=0x%x BUF1=0x%x BUF2=0x%x",
i, (unsigned int)(x->a),
(unsigned int)((x->a) >> 32), x->b, x->c);
seq_printf(seq, "\n");
}
return 0;
}
static int stmmac_sysfs_ring_open(struct inode *inode, struct file *file)
{
return single_open(file, stmmac_sysfs_ring_read, inode->i_private);
}
static const struct file_operations stmmac_rings_status_fops = {
.owner = THIS_MODULE,
.open = stmmac_sysfs_ring_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
static int stmmac_init_fs(struct net_device *dev)
{
/* Create debugfs entries */
stmmac_fs_dir = debugfs_create_dir(STMMAC_RESOURCE_NAME, NULL);
if (!stmmac_fs_dir || IS_ERR(stmmac_fs_dir)) {
pr_err("ERROR %s, debugfs create directory failed\n",
STMMAC_RESOURCE_NAME);
return -ENOMEM;
}
/* Entry to report DMA RX/TX rings */
stmmac_rings_status = debugfs_create_file("descriptors_status",
S_IRUGO, stmmac_fs_dir, dev,
&stmmac_rings_status_fops);
if (!stmmac_rings_status || IS_ERR(stmmac_rings_status)) {
pr_info("ERROR creating stmmac ring debugfs file\n");
debugfs_remove(stmmac_fs_dir);
return -ENOMEM;
}
return 0;
}
static void stmmac_exit_fs(void)
{
debugfs_remove(stmmac_rings_status);
debugfs_remove(stmmac_fs_dir);
}
#endif /* CONFIG_STMMAC_DEBUG_FS */
static const struct net_device_ops stmmac_netdev_ops = {
.ndo_open = stmmac_open,
.ndo_start_xmit = stmmac_xmit,
@ -1651,6 +1745,13 @@ static int stmmac_dvr_probe(struct platform_device *pdev)
if (ret < 0)
goto out_unregister;
pr_debug("registered!\n");
#ifdef CONFIG_STMMAC_DEBUG_FS
ret = stmmac_init_fs(ndev);
if (ret < 0)
pr_warning("\tFailed debugFS registration");
#endif
return 0;
out_unregister:
@ -1703,6 +1804,10 @@ static int stmmac_dvr_remove(struct platform_device *pdev)
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(res->start, resource_size(res));
#ifdef CONFIG_STMMAC_DEBUG_FS
stmmac_exit_fs();
#endif
free_netdev(ndev);
return 0;