util: Add a virtual memory allocator

This is simple linear-walk first-fit allocator roughly based on the
allocator in the radeon winsys code.  This allocator has two primary
functional differences:

 1) It cleanly returns 0 on allocation failure

 2) It allocates addresses top-down instead of bottom-up.

The second one is needed for Intel because high addresses (with bit 47
set) need to be canonicalized in order to work properly.  If we allocate
bottom-up, then high addresses will be very rare (if they ever happen).
We'd rather always have high addresses so that the canonicalization code
gets better testing.

v2: - [scott-ph] remove _heap_validate() if NDEBUG is defined (Jordan)

Reviewed-by: Scott D Phillips <[email protected]>
Tested-by: Scott D Phillips <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>

1 files changed, 53 insertions, 0 deletions

diff --git a/src/util/vma.h b/src/util/vma.h
new file mode 100644
index 00000000000..ed69914e4cb
--- /dev/null
+++ b/src/util/vma.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright © 2018 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.
+ */
+
+#ifndef _UTIL_VMA_H
+#define _UTIL_VMA_H
+
+#include <stdint.h>
+
+#include "list.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct util_vma_heap {
+   struct list_head holes;
+};
+
+void util_vma_heap_init(struct util_vma_heap *heap,
+                        uint64_t start, uint64_t size);
+void util_vma_heap_finish(struct util_vma_heap *heap);
+
+uint64_t util_vma_heap_alloc(struct util_vma_heap *heap,
+                             uint64_t size, uint64_t alignment);
+
+void util_vma_heap_free(struct util_vma_heap *heap,
+                        uint64_t offset, uint64_t size);
+
+#ifdef __cplusplus
+} /* extern C */
+#endif
+
+#endif /* _UTIL_DEBUG_H */