cxgb4: Add debugfs entry to dump the contents of the flash
Adds support to dump the contents of the flash in the adapter
Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
index 6dabfe5..8b2e230 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
@@ -434,6 +434,51 @@
.release = seq_release_private
};
+static ssize_t flash_read(struct file *file, char __user *buf, size_t count,
+ loff_t *ppos)
+{
+ loff_t pos = *ppos;
+ loff_t avail = FILE_DATA(file)->i_size;
+ struct adapter *adap = file->private_data;
+
+ if (pos < 0)
+ return -EINVAL;
+ if (pos >= avail)
+ return 0;
+ if (count > avail - pos)
+ count = avail - pos;
+
+ while (count) {
+ size_t len;
+ int ret, ofst;
+ u8 data[256];
+
+ ofst = pos & 3;
+ len = min(count + ofst, sizeof(data));
+ ret = t4_read_flash(adap, pos - ofst, (len + 3) / 4,
+ (u32 *)data, 1);
+ if (ret)
+ return ret;
+
+ len -= ofst;
+ if (copy_to_user(buf, data + ofst, len))
+ return -EFAULT;
+
+ buf += len;
+ pos += len;
+ count -= len;
+ }
+ count = pos - *ppos;
+ *ppos = pos;
+ return count;
+}
+
+static const struct file_operations flash_debugfs_fops = {
+ .owner = THIS_MODULE,
+ .open = mem_open,
+ .read = flash_read,
+};
+
static inline void tcamxy2valmask(u64 x, u64 y, u8 *addr, u64 *mask)
{
*mask = x | y;
@@ -579,6 +624,21 @@
};
#endif
+int mem_open(struct inode *inode, struct file *file)
+{
+ unsigned int mem;
+ struct adapter *adap;
+
+ file->private_data = inode->i_private;
+
+ mem = (uintptr_t)file->private_data & 0x3;
+ adap = file->private_data - mem;
+
+ (void)t4_fwcache(adap, FW_PARAM_DEV_FWCACHE_FLUSH);
+
+ return 0;
+}
+
static ssize_t mem_read(struct file *file, char __user *buf, size_t count,
loff_t *ppos)
{
@@ -616,7 +676,6 @@
*ppos = pos + count;
return count;
}
-
static const struct file_operations mem_debugfs_fops = {
.owner = THIS_MODULE,
.open = simple_open,
@@ -624,6 +683,12 @@
.llseek = default_llseek,
};
+static void set_debugfs_file_size(struct dentry *de, loff_t size)
+{
+ if (!IS_ERR(de) && de->d_inode)
+ de->d_inode->i_size = size;
+}
+
static void add_debugfs_mem(struct adapter *adap, const char *name,
unsigned int idx, unsigned int size_mb)
{
@@ -655,6 +720,7 @@
{
int i;
u32 size;
+ struct dentry *de;
static struct t4_debugfs_entry t4_debugfs_files[] = {
{ "cim_la", &cim_la_fops, S_IRUSR, 0 },
@@ -697,5 +763,10 @@
EXT_MEM1_SIZE_G(size));
}
}
+
+ de = debugfs_create_file("flash", S_IRUSR, adap->debugfs_root, adap,
+ &flash_debugfs_fops);
+ set_debugfs_file_size(de, adap->params.sf_size);
+
return 0;
}