iris: Hook up device reset callbacks

This mechanism lets the driver inform the state tracker about GPU
resets, say for destroying a robust API context and reporting a "device
lost" error to the application, making it take action to deal with this.

src/gallium/drivers/iris/iris_batch.c

@@ -163,6 +163,7 @@ iris_init_batch(struct iris_batch *batch,
                 struct iris_screen *screen,
                 struct iris_vtable *vtbl,
                 struct pipe_debug_callback *dbg,
+                struct pipe_device_reset_callback *reset,
                 struct iris_batch *all_batches,
                 enum iris_batch_name name,
                 uint8_t engine,
@@ -171,6 +172,7 @@ iris_init_batch(struct iris_batch *batch,
    batch->screen = screen;
    batch->vtbl = vtbl;
    batch->dbg = dbg;
+   batch->reset = reset;
    batch->name = name;
 
    /* engine should be one of I915_EXEC_RENDER, I915_EXEC_BLT, etc. */
@@ -611,6 +613,11 @@ _iris_batch_flush(struct iris_batch *batch, const char *file, int line)
     * dubiously claim success...
     */
    if (ret == -EIO && replace_hw_ctx(batch)) {
+      if (batch->reset->reset) {
+         /* Tell the state tracker the device is lost and it was our fault. */
+         batch->reset->reset(batch->reset->data, PIPE_GUILTY_CONTEXT_RESET);
+      }
+
       ret = 0;
    }
 

src/gallium/drivers/iris/iris_batch.h

@@ -58,6 +58,7 @@ struct iris_batch {
    struct iris_screen *screen;
    struct iris_vtable *vtbl;
    struct pipe_debug_callback *dbg;
+   struct pipe_device_reset_callback *reset;
 
    /** What batch is this? (e.g. IRIS_BATCH_RENDER/COMPUTE) */
    enum iris_batch_name name;
@@ -130,6 +131,7 @@ void iris_init_batch(struct iris_batch *batch,
                      struct iris_screen *screen,
                      struct iris_vtable *vtbl,
                      struct pipe_debug_callback *dbg,
+                     struct pipe_device_reset_callback *reset,
                      struct iris_batch *all_batches,
                      enum iris_batch_name name,
                      uint8_t ring,

src/gallium/drivers/iris/iris_context.c

@@ -101,6 +101,18 @@ iris_lost_context_state(struct iris_batch *batch)
    memset(ice->state.last_grid, 0, sizeof(ice->state.last_grid));
 }
 
+static void
+iris_set_device_reset_callback(struct pipe_context *ctx,
+                               const struct pipe_device_reset_callback *cb)
+{
+   struct iris_context *ice = (struct iris_context *)ctx;
+
+   if (cb)
+      ice->reset = *cb;
+   else
+      memset(&ice->reset, 0, sizeof(ice->reset));
+}
+
 static void
 iris_get_sample_position(struct pipe_context *ctx,
                          unsigned sample_count,
@@ -210,6 +222,7 @@ iris_create_context(struct pipe_screen *pscreen, void *priv, unsigned flags)
 
    ctx->destroy = iris_destroy_context;
    ctx->set_debug_callback = iris_set_debug_callback;
+   ctx->set_device_reset_callback = iris_set_device_reset_callback;
    ctx->get_sample_position = iris_get_sample_position;
 
    ice->shaders.urb_size = devinfo->urb.size;
@@ -250,7 +263,7 @@ iris_create_context(struct pipe_screen *pscreen, void *priv, unsigned flags)
 
    for (int i = 0; i < IRIS_BATCH_COUNT; i++) {
       iris_init_batch(&ice->batches[i], screen, &ice->vtbl, &ice->dbg,
-                      ice->batches, (enum iris_batch_name) i,
+                      &ice->reset, ice->batches, (enum iris_batch_name) i,
                       I915_EXEC_RENDER, priority);
    }
 

src/gallium/drivers/iris/iris_context.h

@@ -440,6 +440,9 @@ struct iris_context {
    /** A debug callback for KHR_debug output. */
    struct pipe_debug_callback dbg;
 
+   /** A device reset status callback for notifying that the GPU is hosed. */
+   struct pipe_device_reset_callback reset;
+
    /** Slab allocator for iris_transfer_map objects. */
    struct slab_child_pool transfer_pool;