drm/i915: BUG_ON() when cmd/reg tables are not sorted

As suggested during review, this makes it much more obvious
when the tables are not sorted.

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Signed-off-by: Brad Volkin <bradley.d.volkin@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 21 insertions, 10 deletions

diff --git a/drivers/gpu/drm/i915/i915_cmd_parser.c b/drivers/gpu/drm/i915/i915_cmd_parser.c
index d8e5034bdb1d..d25143424576 100644
--- a/drivers/gpu/drm/i915/i915_cmd_parser.c
+++ b/drivers/gpu/drm/i915/i915_cmd_parser.c
@@ -493,12 +493,13 @@ static u32 gen7_blt_get_cmd_length_mask(u32 cmd_header)
         return 0;
 }
 
-static void validate_cmds_sorted(struct intel_ring_buffer *ring)
+static bool validate_cmds_sorted(struct intel_ring_buffer *ring)
 {
         int i;
+        bool ret = true;
 
         if (!ring->cmd_tables || ring->cmd_table_count == 0)
-                return;
+                return true;
 
         for (i = 0; i < ring->cmd_table_count; i++) {
                 const struct drm_i915_cmd_table *table = &ring->cmd_tables[i];
@@ -510,35 +511,45 @@ static void validate_cmds_sorted(struct intel_ring_buffer *ring)
                                 &table->table[i];
                         u32 curr = desc->cmd.value & desc->cmd.mask;
 
-                        if (curr < previous)
+                        if (curr < previous) {
                                 DRM_ERROR("CMD: table not sorted ring=%d table=%d entry=%d cmd=0x%08X prev=0x%08X\n",
                                           ring->id, i, j, curr, previous);
+                                ret = false;
+                        }
 
                         previous = curr;
                 }
         }
+
+        return ret;
 }
 
-static void check_sorted(int ring_id, const u32 *reg_table, int reg_count)
+static bool check_sorted(int ring_id, const u32 *reg_table, int reg_count)
 {
         int i;
         u32 previous = 0;
+        bool ret = true;
 
         for (i = 0; i < reg_count; i++) {
                 u32 curr = reg_table[i];
 
-                if (curr < previous)
+                if (curr < previous) {
                         DRM_ERROR("CMD: table not sorted ring=%d entry=%d reg=0x%08X prev=0x%08X\n",
                                   ring_id, i, curr, previous);
+                        ret = false;
+                }
 
                 previous = curr;
         }
+
+        return ret;
 }
 
-static void validate_regs_sorted(struct intel_ring_buffer *ring)
+static bool validate_regs_sorted(struct intel_ring_buffer *ring)
 {
-        check_sorted(ring->id, ring->reg_table, ring->reg_count);
-        check_sorted(ring->id, ring->master_reg_table, ring->master_reg_count);
+        return check_sorted(ring->id, ring->reg_table, ring->reg_count) &&
+                check_sorted(ring->id, ring->master_reg_table,
+                             ring->master_reg_count);
 }
 
 /**
@@ -617,8 +628,8 @@ void i915_cmd_parser_init_ring(struct intel_ring_buffer *ring)
                 BUG();
         }
 
-        validate_cmds_sorted(ring);
-        validate_regs_sorted(ring);
+        BUG_ON(!validate_cmds_sorted(ring));
+        BUG_ON(!validate_regs_sorted(ring));
 }
 
 static const struct drm_i915_cmd_descriptor*