1 files changed, 287 insertions, 0 deletions
diff --git a/drivers/gpu/arm/utgard/linux/mali_osk_locks.c b/drivers/gpu/arm/utgard/linux/mali_osk_locks.c
new file mode 100644
index 000000000000..50c0a9d23819
--- /dev/null
+++ b/drivers/gpu/arm/utgard/linux/mali_osk_locks.c
@@ -0,0 +1,287 @@
+/*
+ * Copyright (C) 2010-2015 ARM Limited. All rights reserved.
+ * 
+ * This program is free software and is provided to you under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation, and any use by you of this program is subject to the terms of such GNU licence.
+ * 
+ * A copy of the licence is included with the program, and can also be obtained from Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+/**
+ * @file mali_osk_locks.c
+ * Implemenation of the OS abstraction layer for the kernel device driver
+ */
+
+#include "mali_osk_locks.h"
+#include "mali_kernel_common.h"
+#include "mali_osk.h"
+
+
+#ifdef DEBUG
+#ifdef LOCK_ORDER_CHECKING
+static DEFINE_SPINLOCK(lock_tracking_lock);
+static mali_bool add_lock_to_log_and_check(struct _mali_osk_lock_debug_s *lock, uint32_t tid);
+static void remove_lock_from_log(struct _mali_osk_lock_debug_s *lock, uint32_t tid);
+static const char *const lock_order_to_string(_mali_osk_lock_order_t order);
+#endif /* LOCK_ORDER_CHECKING */
+
+void _mali_osk_locks_debug_init(struct _mali_osk_lock_debug_s *checker, _mali_osk_lock_flags_t flags, _mali_osk_lock_order_t order)
+{
+	checker->orig_flags = flags;
+	checker->owner = 0;
+
+#ifdef LOCK_ORDER_CHECKING
+	checker->order = order;
+	checker->next = NULL;
+#endif
+}
+
+void _mali_osk_locks_debug_add(struct _mali_osk_lock_debug_s *checker)
+{
+	checker->owner = _mali_osk_get_tid();
+
+#ifdef LOCK_ORDER_CHECKING
+	if (!(checker->orig_flags & _MALI_OSK_LOCKFLAG_UNORDERED)) {
+		if (!add_lock_to_log_and_check(checker, _mali_osk_get_tid())) {
+			printk(KERN_ERR "%d: ERROR lock %p taken while holding a lock of a higher order.\n",
+			       _mali_osk_get_tid(), checker);
+			dump_stack();
+		}
+	}
+#endif
+}
+
+void _mali_osk_locks_debug_remove(struct _mali_osk_lock_debug_s *checker)
+{
+
+#ifdef LOCK_ORDER_CHECKING
+	if (!(checker->orig_flags & _MALI_OSK_LOCKFLAG_UNORDERED)) {
+		remove_lock_from_log(checker, _mali_osk_get_tid());
+	}
+#endif
+	checker->owner = 0;
+}
+
+
+#ifdef LOCK_ORDER_CHECKING
+/* Lock order checking
+ * -------------------
+ *
+ * To assure that lock ordering scheme defined by _mali_osk_lock_order_t is strictly adhered to, the
+ * following function will, together with a linked list and some extra members in _mali_osk_lock_debug_s,
+ * make sure that a lock that is taken has a higher order than the current highest-order lock a
+ * thread holds.
+ *
+ * This is done in the following manner:
+ * - A linked list keeps track of locks held by a thread.
+ * - A `next' pointer is added to each lock. This is used to chain the locks together.
+ * - When taking a lock, the `add_lock_to_log_and_check' makes sure that taking
+ *   the given lock is legal. It will follow the linked list  to find the last
+ *   lock taken by this thread. If the last lock's order was lower than the
+ *   lock that is to be taken, it appends the new lock to the list and returns
+ *   true, if not, it return false. This return value is assert()'ed on in
+ *   _mali_osk_lock_wait().
+ */
+
+static struct _mali_osk_lock_debug_s *lock_lookup_list;
+
+static void dump_lock_tracking_list(void)
+{
+	struct _mali_osk_lock_debug_s *l;
+	u32 n = 1;
+
+	/* print list for debugging purposes */
+	l = lock_lookup_list;
+
+	while (NULL != l) {
+		printk(" [lock: %p, tid_owner: %d, order: %d] ->", l, l->owner, l->order);
+		l = l->next;
+		MALI_DEBUG_ASSERT(n++ < 100);
+	}
+	printk(" NULL\n");
+}
+
+static int tracking_list_length(void)
+{
+	struct _mali_osk_lock_debug_s *l;
+	u32 n = 0;
+	l = lock_lookup_list;
+
+	while (NULL != l) {
+		l = l->next;
+		n++;
+		MALI_DEBUG_ASSERT(n < 100);
+	}
+	return n;
+}
+
+static mali_bool add_lock_to_log_and_check(struct _mali_osk_lock_debug_s *lock, uint32_t tid)
+{
+	mali_bool ret = MALI_FALSE;
+	_mali_osk_lock_order_t highest_order_for_tid = _MALI_OSK_LOCK_ORDER_FIRST;
+	struct _mali_osk_lock_debug_s *highest_order_lock = (struct _mali_osk_lock_debug_s *)0xbeefbabe;
+	struct _mali_osk_lock_debug_s *l;
+	unsigned long local_lock_flag;
+	u32 len;
+
+	spin_lock_irqsave(&lock_tracking_lock, local_lock_flag);
+	len = tracking_list_length();
+
+	l  = lock_lookup_list;
+	if (NULL == l) { /* This is the first lock taken by this thread -- record and return true */
+		lock_lookup_list = lock;
+		spin_unlock_irqrestore(&lock_tracking_lock, local_lock_flag);
+		return MALI_TRUE;
+	} else {
+		/* Traverse the locks taken and find the lock of the highest order.
+		 * Since several threads may hold locks, each lock's owner must be
+		 * checked so that locks not owned by this thread can be ignored. */
+		for (;;) {
+			MALI_DEBUG_ASSERT_POINTER(l);
+			if (tid == l->owner && l->order >= highest_order_for_tid) {
+				highest_order_for_tid = l->order;
+				highest_order_lock = l;
+			}
+
+			if (NULL != l->next) {
+				l = l->next;
+			} else {
+				break;
+			}
+		}
+
+		l->next = lock;
+		l->next = NULL;
+	}
+
+	/* We have now found the highest order lock currently held by this thread and can see if it is
+	 * legal to take the requested lock. */
+	ret = highest_order_for_tid < lock->order;
+
+	if (!ret) {
+		printk(KERN_ERR "Took lock of order %d (%s) while holding lock of order %d (%s)\n",
+		       lock->order, lock_order_to_string(lock->order),
+		       highest_order_for_tid, lock_order_to_string(highest_order_for_tid));
+		dump_lock_tracking_list();
+	}
+
+	if (len + 1 != tracking_list_length()) {
+		printk(KERN_ERR "************ lock: %p\n", lock);
+		printk(KERN_ERR "************ before: %d *** after: %d ****\n", len, tracking_list_length());
+		dump_lock_tracking_list();
+		MALI_DEBUG_ASSERT_POINTER(NULL);
+	}
+
+	spin_unlock_irqrestore(&lock_tracking_lock, local_lock_flag);
+	return ret;
+}
+
+static void remove_lock_from_log(struct _mali_osk_lock_debug_s *lock, uint32_t tid)
+{
+	struct _mali_osk_lock_debug_s *curr;
+	struct _mali_osk_lock_debug_s *prev = NULL;
+	unsigned long local_lock_flag;
+	u32 len;
+	u32 n = 0;
+
+	spin_lock_irqsave(&lock_tracking_lock, local_lock_flag);
+	len = tracking_list_length();
+	curr = lock_lookup_list;
+
+	if (NULL == curr) {
+		printk(KERN_ERR "Error: Lock tracking list was empty on call to remove_lock_from_log\n");
+		dump_lock_tracking_list();
+	}
+
+	MALI_DEBUG_ASSERT_POINTER(curr);
+
+
+	while (lock != curr) {
+		prev = curr;
+
+		MALI_DEBUG_ASSERT_POINTER(curr);
+		curr = curr->next;
+		MALI_DEBUG_ASSERT(n++ < 100);
+	}
+
+	if (NULL == prev) {
+		lock_lookup_list = curr->next;
+	} else {
+		MALI_DEBUG_ASSERT_POINTER(curr);
+		MALI_DEBUG_ASSERT_POINTER(prev);
+		prev->next = curr->next;
+	}
+
+	lock->next = NULL;
+
+	if (len - 1 != tracking_list_length()) {
+		printk(KERN_ERR "************ lock: %p\n", lock);
+		printk(KERN_ERR "************ before: %d *** after: %d ****\n", len, tracking_list_length());
+		dump_lock_tracking_list();
+		MALI_DEBUG_ASSERT_POINTER(NULL);
+	}
+
+	spin_unlock_irqrestore(&lock_tracking_lock, local_lock_flag);
+}
+
+static const char *const lock_order_to_string(_mali_osk_lock_order_t order)
+{
+	switch (order) {
+	case _MALI_OSK_LOCK_ORDER_SESSIONS:
+		return "_MALI_OSK_LOCK_ORDER_SESSIONS";
+		break;
+	case _MALI_OSK_LOCK_ORDER_MEM_SESSION:
+		return "_MALI_OSK_LOCK_ORDER_MEM_SESSION";
+		break;
+	case _MALI_OSK_LOCK_ORDER_MEM_INFO:
+		return "_MALI_OSK_LOCK_ORDER_MEM_INFO";
+		break;
+	case _MALI_OSK_LOCK_ORDER_MEM_PT_CACHE:
+		return "_MALI_OSK_LOCK_ORDER_MEM_PT_CACHE";
+		break;
+	case _MALI_OSK_LOCK_ORDER_DESCRIPTOR_MAP:
+		return "_MALI_OSK_LOCK_ORDER_DESCRIPTOR_MAP";
+		break;
+	case _MALI_OSK_LOCK_ORDER_PM_EXECUTION:
+		return "_MALI_OSK_LOCK_ORDER_PM_EXECUTION";
+		break;
+	case _MALI_OSK_LOCK_ORDER_EXECUTOR:
+		return "_MALI_OSK_LOCK_ORDER_EXECUTOR";
+		break;
+	case _MALI_OSK_LOCK_ORDER_TIMELINE_SYSTEM:
+		return "_MALI_OSK_LOCK_ORDER_TIMELINE_SYSTEM";
+		break;
+	case _MALI_OSK_LOCK_ORDER_SCHEDULER:
+		return "_MALI_OSK_LOCK_ORDER_SCHEDULER";
+		break;
+	case _MALI_OSK_LOCK_ORDER_SCHEDULER_DEFERRED:
+		return "_MALI_OSK_LOCK_ORDER_SCHEDULER_DEFERRED";
+		break;
+	case _MALI_OSK_LOCK_ORDER_DMA_COMMAND:
+		return "_MALI_OSK_LOCK_ORDER_DMA_COMMAND";
+		break;
+	case _MALI_OSK_LOCK_ORDER_PROFILING:
+		return "_MALI_OSK_LOCK_ORDER_PROFILING";
+		break;
+	case _MALI_OSK_LOCK_ORDER_L2:
+		return "_MALI_OSK_LOCK_ORDER_L2";
+		break;
+	case _MALI_OSK_LOCK_ORDER_L2_COMMAND:
+		return "_MALI_OSK_LOCK_ORDER_L2_COMMAND";
+		break;
+	case _MALI_OSK_LOCK_ORDER_UTILIZATION:
+		return "_MALI_OSK_LOCK_ORDER_UTILIZATION";
+		break;
+	case _MALI_OSK_LOCK_ORDER_SESSION_PENDING_JOBS:
+		return "_MALI_OSK_LOCK_ORDER_SESSION_PENDING_JOBS";
+		break;
+	case _MALI_OSK_LOCK_ORDER_PM_STATE:
+		return "_MALI_OSK_LOCK_ORDER_PM_STATE";
+		break;
+	default:
+		return "<UNKNOWN_LOCK_ORDER>";
+	}
+}
+#endif /* LOCK_ORDER_CHECKING */
+#endif /* DEBUG */