anv: Fix pool allocator when first alloc needs to grow

When using softpin, the first allocation was not calculating the
padding and offset correctly for the case the first allocation needed
to grow.  We were missing initialize the state.end right after
expanding the pool for the first time.

This is not a problem for non-softpin since there we don't use
leftover padding so the ends would re-arrange incrementally.

This fixes running dEQP-VK.ssbo.phys.layout.random.16bit.scalar.13 in
SKL -- the test uses a shader larger than the initial size for the
instruction pool.

Fixes: dfc9ab2ccd9 "anv/allocator: Add padding information."
Reviewed-by: Rafael Antognolli <rafael.antognolli@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
(cherry picked from commit 09c4037ddada76ad07cca2fd6b46f5451fa55f1b)

3 files changed, 71 insertions, 3 deletions

diff --git a/src/intel/vulkan/anv_allocator.c b/src/intel/vulkan/anv_allocator.c
index fa923543703..48d41891cfb 100644
--- a/src/intel/vulkan/anv_allocator.c
+++ b/src/intel/vulkan/anv_allocator.c
@@ -478,6 +478,11 @@ anv_block_pool_init(struct anv_block_pool *pool,
    if (result != VK_SUCCESS)
       goto fail_mmap_cleanups;
 
+   /* Make the entire pool available in the front of the pool.  If back
+    * allocation needs to use this space, the "ends" will be re-arranged.
+    */
+   pool->state.end = pool->size;
+
    return VK_SUCCESS;
 
  fail_mmap_cleanups:
diff --git a/src/intel/vulkan/meson.build b/src/intel/vulkan/meson.build
index 7fe660983d9..4acc31c526f 100644
--- a/src/intel/vulkan/meson.build
+++ b/src/intel/vulkan/meson.build
@@ -235,9 +235,9 @@ if with_tests
     c_args : anv_flags,
   )
 
-  foreach t : ['block_pool_no_free', 'state_pool_no_free',
-               'state_pool_free_list_only', 'state_pool',
-               'state_pool_padding']
+  foreach t : ['block_pool_no_free', 'block_pool_grow_first',
+               'state_pool_no_free', 'state_pool_free_list_only',
+               'state_pool', 'state_pool_padding']
     test(
       'anv_@0@'.format(t),
       executable(
diff --git a/src/intel/vulkan/tests/block_pool_grow_first.c b/src/intel/vulkan/tests/block_pool_grow_first.c
new file mode 100644
index 00000000000..aea12b29de8
--- /dev/null
+++ b/src/intel/vulkan/tests/block_pool_grow_first.c
@@ -0,0 +1,63 @@
+/*
+ * Copyright © 2015 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#undef NDEBUG
+
+#include "anv_private.h"
+
+int main(int argc, char **argv)
+{
+   struct anv_instance instance;
+   struct anv_device device = {
+      .instance = &instance,
+   };
+   struct anv_block_pool pool;
+
+   /* Create a pool with initial size smaller than the block allocated, so
+    * that it must grow in the first allocation.
+    */
+   const uint32_t block_size = 16 * 1024;
+   const uint32_t initial_size = block_size / 2;
+
+   anv_block_pool_init(&pool, &device, 4096, initial_size, EXEC_OBJECT_PINNED);
+   assert(pool.size == initial_size);
+
+   uint32_t padding;
+   int32_t offset = anv_block_pool_alloc(&pool, block_size, &padding);
+
+   /* Pool will have grown at least space to fit the new allocation. */
+   assert(pool.size > initial_size);
+   assert(pool.size >= initial_size + block_size);
+
+   /* The whole initial size is considered padding and the allocation should be
+    * right next to it.
+    */
+   assert(padding == initial_size);
+   assert(offset == initial_size);
+
+   /* Use the memory to ensure it is valid. */
+   void *map = anv_block_pool_map(&pool, offset);
+   memset(map, 22, block_size);
+
+   anv_block_pool_finish(&pool);
+}