mirror of https://gitee.com/openkylin/linux.git
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>
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1c901a46d5
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7ac2905511
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@ -11,6 +11,13 @@ config STMMAC_ETH
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if STMMAC_ETH
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config STMMAC_DEBUG_FS
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bool "Enable monitoring via sysFS "
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default n
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depends on STMMAC_ETH && DEBUG_FS
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-- help
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The stmmac entry in /sys reports DMA TX/RX rings.
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config STMMAC_DA
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bool "STMMAC DMA arbitration scheme"
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default n
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@ -48,6 +48,10 @@
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#include <linux/slab.h>
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#include <linux/prefetch.h>
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#include "stmmac.h"
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#ifdef CONFIG_STMMAC_DEBUG_FS
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#endif
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#define STMMAC_RESOURCE_NAME "stmmaceth"
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@ -1425,6 +1429,96 @@ static int stmmac_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
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return ret;
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}
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#ifdef CONFIG_STMMAC_DEBUG_FS
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static struct dentry *stmmac_fs_dir;
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static struct dentry *stmmac_rings_status;
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static int stmmac_sysfs_ring_read(struct seq_file *seq, void *v)
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{
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struct tmp_s {
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u64 a;
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unsigned int b;
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unsigned int c;
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};
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int i;
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struct net_device *dev = seq->private;
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struct stmmac_priv *priv = netdev_priv(dev);
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seq_printf(seq, "=======================\n");
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seq_printf(seq, " RX descriptor ring\n");
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seq_printf(seq, "=======================\n");
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for (i = 0; i < priv->dma_rx_size; i++) {
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struct tmp_s *x = (struct tmp_s *)(priv->dma_rx + i);
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seq_printf(seq, "[%d] DES0=0x%x DES1=0x%x BUF1=0x%x BUF2=0x%x",
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i, (unsigned int)(x->a),
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(unsigned int)((x->a) >> 32), x->b, x->c);
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seq_printf(seq, "\n");
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}
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seq_printf(seq, "\n");
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seq_printf(seq, "=======================\n");
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seq_printf(seq, " TX descriptor ring\n");
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seq_printf(seq, "=======================\n");
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for (i = 0; i < priv->dma_tx_size; i++) {
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struct tmp_s *x = (struct tmp_s *)(priv->dma_tx + i);
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seq_printf(seq, "[%d] DES0=0x%x DES1=0x%x BUF1=0x%x BUF2=0x%x",
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i, (unsigned int)(x->a),
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(unsigned int)((x->a) >> 32), x->b, x->c);
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seq_printf(seq, "\n");
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}
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return 0;
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}
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static int stmmac_sysfs_ring_open(struct inode *inode, struct file *file)
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{
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return single_open(file, stmmac_sysfs_ring_read, inode->i_private);
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}
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static const struct file_operations stmmac_rings_status_fops = {
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.owner = THIS_MODULE,
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.open = stmmac_sysfs_ring_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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static int stmmac_init_fs(struct net_device *dev)
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{
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/* Create debugfs entries */
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stmmac_fs_dir = debugfs_create_dir(STMMAC_RESOURCE_NAME, NULL);
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if (!stmmac_fs_dir || IS_ERR(stmmac_fs_dir)) {
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pr_err("ERROR %s, debugfs create directory failed\n",
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STMMAC_RESOURCE_NAME);
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return -ENOMEM;
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}
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/* Entry to report DMA RX/TX rings */
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stmmac_rings_status = debugfs_create_file("descriptors_status",
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S_IRUGO, stmmac_fs_dir, dev,
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&stmmac_rings_status_fops);
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if (!stmmac_rings_status || IS_ERR(stmmac_rings_status)) {
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pr_info("ERROR creating stmmac ring debugfs file\n");
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debugfs_remove(stmmac_fs_dir);
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return -ENOMEM;
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}
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return 0;
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}
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static void stmmac_exit_fs(void)
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{
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debugfs_remove(stmmac_rings_status);
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debugfs_remove(stmmac_fs_dir);
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}
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#endif /* CONFIG_STMMAC_DEBUG_FS */
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static const struct net_device_ops stmmac_netdev_ops = {
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.ndo_open = stmmac_open,
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.ndo_start_xmit = stmmac_xmit,
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@ -1651,6 +1745,13 @@ static int stmmac_dvr_probe(struct platform_device *pdev)
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if (ret < 0)
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goto out_unregister;
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pr_debug("registered!\n");
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#ifdef CONFIG_STMMAC_DEBUG_FS
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ret = stmmac_init_fs(ndev);
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if (ret < 0)
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pr_warning("\tFailed debugFS registration");
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#endif
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return 0;
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out_unregister:
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@ -1703,6 +1804,10 @@ static int stmmac_dvr_remove(struct platform_device *pdev)
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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release_mem_region(res->start, resource_size(res));
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#ifdef CONFIG_STMMAC_DEBUG_FS
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stmmac_exit_fs();
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#endif
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free_netdev(ndev);
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return 0;
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