1 files changed, 46 insertions, 13 deletions

diff --git a/drivers/ptp/ptp_private.h b/drivers/ptp/ptp_private.h
index 75f58fc468a7..db4039d642b4 100644
--- a/drivers/ptp/ptp_private.h
+++ b/drivers/ptp/ptp_private.h
@@ -15,16 +15,30 @@
 #include <linux/ptp_clock.h>
 #include <linux/ptp_clock_kernel.h>
 #include <linux/time.h>
+#include <linux/list.h>
+#include <linux/bitmap.h>
+#include <linux/debugfs.h>
 
 #define PTP_MAX_TIMESTAMPS 128
 #define PTP_BUF_TIMESTAMPS 30
 #define PTP_DEFAULT_MAX_VCLOCKS 20
+#define PTP_MAX_VCLOCKS_LIMIT (KMALLOC_MAX_SIZE/(sizeof(int)))
+#define PTP_MAX_CHANNELS 2048
+
+enum {
+	PTP_LOCK_PHYSICAL = 0,
+	PTP_LOCK_VIRTUAL,
+};
 
 struct timestamp_event_queue {
 	struct ptp_extts_event buf[PTP_MAX_TIMESTAMPS];
 	int head;
 	int tail;
 	spinlock_t lock;
+	struct list_head qlist;
+	unsigned long *mask;
+	struct dentry *debugfs_instance;
+	struct debugfs_u32_array dfs_bitmap;
 };
 
 struct ptp_clock {
@@ -35,8 +49,8 @@ struct ptp_clock {
 	int index; /* index into clocks.map */
 	struct pps_device *pps_source;
 	long dialed_frequency; /* remembers the frequency adjustment */
-	struct timestamp_event_queue tsevq; /* simple fifo for time stamps */
-	struct mutex tsevq_mux; /* one process at a time reading the fifo */
+	struct list_head tsevqs; /* timestamp fifo list */
+	spinlock_t tsevqs_lock; /* protects tsevqs from concurrent access */
 	struct mutex pincfg_mux; /* protect concurrent info->pin_config access */
 	wait_queue_head_t tsev_wq;
 	int defunct; /* tells readers to go away when clock is being removed */
@@ -53,6 +67,7 @@ struct ptp_clock {
 	struct mutex n_vclocks_mux; /* protect concurrent n_vclocks access */
 	bool is_virtual_clock;
 	bool has_cycles;
+	struct dentry *debugfs_root;
 };
 
 #define info_to_vclock(d) container_of((d), struct ptp_vclock, info)
@@ -76,9 +91,13 @@ struct ptp_vclock {
  * that a writer might concurrently increment the tail does not
  * matter, since the queue remains nonempty nonetheless.
  */
-static inline int queue_cnt(struct timestamp_event_queue *q)
+static inline int queue_cnt(const struct timestamp_event_queue *q)
 {
-	int cnt = q->tail - q->head;
+	/*
+	 * Paired with WRITE_ONCE() in enqueue_external_timestamp(),
+	 * ptp_read(), extts_fifo_show().
+	 */
+	int cnt = READ_ONCE(q->tail) - READ_ONCE(q->head);
 	return cnt < 0 ? PTP_MAX_TIMESTAMPS + cnt : cnt;
 }
 
@@ -87,10 +106,20 @@ static inline bool ptp_vclock_in_use(struct ptp_clock *ptp)
 {
 	bool in_use = false;
 
+	/* Virtual clocks can't be stacked on top of virtual clocks.
+	 * Avoid acquiring the n_vclocks_mux on virtual clocks, to allow this
+	 * function to be called from code paths where the n_vclocks_mux of the
+	 * parent physical clock is already held. Functionally that's not an
+	 * issue, but lockdep would complain, because they have the same lock
+	 * class.
+	 */
+	if (ptp->is_virtual_clock)
+		return false;
+
 	if (mutex_lock_interruptible(&ptp->n_vclocks_mux))
 		return true;
 
-	if (!ptp->is_virtual_clock && ptp->n_vclocks)
+	if (ptp->n_vclocks)
 		in_use = true;
 
 	mutex_unlock(&ptp->n_vclocks_mux);
@@ -107,26 +136,30 @@ static inline bool ptp_clock_freerun(struct ptp_clock *ptp)
 	return ptp_vclock_in_use(ptp);
 }
 
-extern struct class *ptp_class;
+extern const struct class ptp_class;
 
 /*
  * see ptp_chardev.c
  */
 
+void ptp_disable_all_events(struct ptp_clock *ptp);
+
 /* caller must hold pincfg_mux */
 int ptp_set_pinfunc(struct ptp_clock *ptp, unsigned int pin,
 		    enum ptp_pin_function func, unsigned int chan);
 
-long ptp_ioctl(struct posix_clock *pc,
-	       unsigned int cmd, unsigned long arg);
+long ptp_ioctl(struct posix_clock_context *pccontext, unsigned int cmd,
+	       unsigned long arg);
+
+int ptp_open(struct posix_clock_context *pccontext, fmode_t fmode);
 
-int ptp_open(struct posix_clock *pc, fmode_t fmode);
+int ptp_release(struct posix_clock_context *pccontext);
 
-ssize_t ptp_read(struct posix_clock *pc,
-		 uint flags, char __user *buf, size_t cnt);
+ssize_t ptp_read(struct posix_clock_context *pccontext, uint flags, char __user *buf,
+		 size_t cnt);
 
-__poll_t ptp_poll(struct posix_clock *pc,
-	      struct file *fp, poll_table *wait);
+__poll_t ptp_poll(struct posix_clock_context *pccontext, struct file *fp,
+		  poll_table *wait);
 
 /*
  * see ptp_sysfs.c