ath6kl: add firmware log support
Firmware sends binary logs with WMIX_DBGLOG_EVENTID event. Create
a buffer which stores the latest logs and which can be copied from
fwlog debugfs file with cp command.
To save memory firmware log support is enabled only when CONFIG_ATH6KL_DEBUG
is enabled.
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
diff --git a/drivers/net/wireless/ath/ath6kl/debug.c b/drivers/net/wireless/ath/ath6kl/debug.c
index 2b46287..b2706da 100644
--- a/drivers/net/wireless/ath/ath6kl/debug.c
+++ b/drivers/net/wireless/ath/ath6kl/debug.c
@@ -15,7 +15,23 @@
*/
#include "core.h"
+
+#include <linux/circ_buf.h>
+
#include "debug.h"
+#include "target.h"
+
+struct ath6kl_fwlog_slot {
+ __le32 timestamp;
+ __le32 length;
+
+ /* max ATH6KL_FWLOG_PAYLOAD_SIZE bytes */
+ u8 payload[0];
+};
+
+#define ATH6KL_FWLOG_SIZE 32768
+#define ATH6KL_FWLOG_SLOT_SIZE (sizeof(struct ath6kl_fwlog_slot) + \
+ ATH6KL_FWLOG_PAYLOAD_SIZE)
int ath6kl_printk(const char *level, const char *fmt, ...)
{
@@ -153,6 +169,117 @@
return 0;
}
+static void ath6kl_debug_fwlog_add(struct ath6kl *ar, const void *buf,
+ size_t buf_len)
+{
+ struct circ_buf *fwlog = &ar->debug.fwlog_buf;
+ size_t space;
+ int i;
+
+ /* entries must all be equal size */
+ if (WARN_ON(buf_len != ATH6KL_FWLOG_SLOT_SIZE))
+ return;
+
+ space = CIRC_SPACE(fwlog->head, fwlog->tail, ATH6KL_FWLOG_SIZE);
+ if (space < buf_len)
+ /* discard oldest slot */
+ fwlog->tail = (fwlog->tail + ATH6KL_FWLOG_SLOT_SIZE) &
+ (ATH6KL_FWLOG_SIZE - 1);
+
+ for (i = 0; i < buf_len; i += space) {
+ space = CIRC_SPACE_TO_END(fwlog->head, fwlog->tail,
+ ATH6KL_FWLOG_SIZE);
+
+ if ((size_t) space > buf_len - i)
+ space = buf_len - i;
+
+ memcpy(&fwlog->buf[fwlog->head], buf, space);
+ fwlog->head = (fwlog->head + space) & (ATH6KL_FWLOG_SIZE - 1);
+ }
+
+}
+
+void ath6kl_debug_fwlog_event(struct ath6kl *ar, const void *buf, size_t len)
+{
+ struct ath6kl_fwlog_slot *slot = ar->debug.fwlog_tmp;
+ size_t slot_len;
+
+ if (WARN_ON(len > ATH6KL_FWLOG_PAYLOAD_SIZE))
+ return;
+
+ spin_lock_bh(&ar->debug.fwlog_lock);
+
+ slot->timestamp = cpu_to_le32(jiffies);
+ slot->length = cpu_to_le32(len);
+ memcpy(slot->payload, buf, len);
+
+ slot_len = sizeof(*slot) + len;
+
+ if (slot_len < ATH6KL_FWLOG_SLOT_SIZE)
+ memset(slot->payload + len, 0,
+ ATH6KL_FWLOG_SLOT_SIZE - slot_len);
+
+ ath6kl_debug_fwlog_add(ar, slot, ATH6KL_FWLOG_SLOT_SIZE);
+
+ spin_unlock_bh(&ar->debug.fwlog_lock);
+}
+
+static bool ath6kl_debug_fwlog_empty(struct ath6kl *ar)
+{
+ return CIRC_CNT(ar->debug.fwlog_buf.head,
+ ar->debug.fwlog_buf.tail,
+ ATH6KL_FWLOG_SLOT_SIZE) == 0;
+}
+
+static ssize_t ath6kl_fwlog_read(struct file *file, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct ath6kl *ar = file->private_data;
+ struct circ_buf *fwlog = &ar->debug.fwlog_buf;
+ size_t len = 0, buf_len = count;
+ ssize_t ret_cnt;
+ char *buf;
+ int ccnt;
+
+ buf = vmalloc(buf_len);
+ if (!buf)
+ return -ENOMEM;
+
+ spin_lock_bh(&ar->debug.fwlog_lock);
+
+ while (len < buf_len && !ath6kl_debug_fwlog_empty(ar)) {
+ ccnt = CIRC_CNT_TO_END(fwlog->head, fwlog->tail,
+ ATH6KL_FWLOG_SIZE);
+
+ if ((size_t) ccnt > buf_len - len)
+ ccnt = buf_len - len;
+
+ memcpy(buf + len, &fwlog->buf[fwlog->tail], ccnt);
+ len += ccnt;
+
+ fwlog->tail = (fwlog->tail + ccnt) &
+ (ATH6KL_FWLOG_SIZE - 1);
+ }
+
+ spin_unlock_bh(&ar->debug.fwlog_lock);
+
+ if (WARN_ON(len > buf_len))
+ len = buf_len;
+
+ ret_cnt = simple_read_from_buffer(user_buf, count, ppos, buf, len);
+
+ vfree(buf);
+
+ return ret_cnt;
+}
+
+static const struct file_operations fops_fwlog = {
+ .open = ath6kl_debugfs_open,
+ .read = ath6kl_fwlog_read,
+ .owner = THIS_MODULE,
+ .llseek = default_llseek,
+};
+
static ssize_t read_file_tgt_stats(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
@@ -358,10 +485,25 @@
int ath6kl_debug_init(struct ath6kl *ar)
{
+ ar->debug.fwlog_buf.buf = vmalloc(ATH6KL_FWLOG_SIZE);
+ if (ar->debug.fwlog_buf.buf == NULL)
+ return -ENOMEM;
+
+ ar->debug.fwlog_tmp = kmalloc(ATH6KL_FWLOG_SLOT_SIZE, GFP_KERNEL);
+ if (ar->debug.fwlog_tmp == NULL) {
+ vfree(ar->debug.fwlog_buf.buf);
+ return -ENOMEM;
+ }
+
+ spin_lock_init(&ar->debug.fwlog_lock);
+
ar->debugfs_phy = debugfs_create_dir("ath6kl",
ar->wdev->wiphy->debugfsdir);
- if (!ar->debugfs_phy)
+ if (!ar->debugfs_phy) {
+ vfree(ar->debug.fwlog_buf.buf);
+ kfree(ar->debug.fwlog_tmp);
return -ENOMEM;
+ }
debugfs_create_file("tgt_stats", S_IRUSR, ar->debugfs_phy, ar,
&fops_tgt_stats);
@@ -369,6 +511,16 @@
debugfs_create_file("credit_dist_stats", S_IRUSR, ar->debugfs_phy, ar,
&fops_credit_dist_stats);
+ debugfs_create_file("fwlog", S_IRUSR, ar->debugfs_phy, ar,
+ &fops_fwlog);
+
return 0;
}
+
+void ath6kl_debug_cleanup(struct ath6kl *ar)
+{
+ vfree(ar->debug.fwlog_buf.buf);
+ kfree(ar->debug.fwlog_tmp);
+}
+
#endif