minigbm: Add VC4 backend

BUG=None
TEST=None

Change-Id: I6cece89a42ea41066cd8c4e2fc332898d5edb60a
Reviewed-on: https://chromium-review.googlesource.com/439448
Commit-Ready: Niklas Schulze <me@jns.io>
Tested-by: Niklas Schulze <me@jns.io>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>

diff --git a/drv.c b/drv.c
index 34b941a..fb79e12 100644 (file)
--- a/drv.c
+++ b/drv.c
@@ -44,6 +44,9 @@ extern struct backend backend_rockchip;
 extern struct backend backend_tegra;
 #endif
 extern struct backend backend_udl;
+#ifdef DRV_VC4
+extern struct backend backend_vc4;
+#endif
 extern struct backend backend_vgem;
 extern struct backend backend_virtio_gpu;
 
@@ -84,6 +87,9 @@ static struct backend *drv_get_backend(int fd)
                &backend_tegra,
 #endif
                &backend_udl,
+#ifdef DRV_VC4
+               &backend_vc4,
+#endif
                &backend_vgem,
                &backend_virtio_gpu,
        };

diff --git a/vc4.c b/vc4.c
new file mode 100644 (file)
index 0000000..7e5351f
--- /dev/null
+++ b/vc4.c
@@ -0,0 +1,93 @@
+/*
+ * Copyright 2017 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifdef DRV_VC4
+
+#include <stdio.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <vc4_drm.h>
+#include <xf86drm.h>
+
+#include "drv_priv.h"
+#include "helpers.h"
+#include "util.h"
+
+static struct supported_combination combos[3] = {
+       {DRM_FORMAT_ARGB8888, DRM_FORMAT_MOD_NONE,
+               BO_USE_CURSOR | BO_USE_LINEAR | BO_USE_RENDERING | BO_USE_SW_READ_OFTEN |
+               BO_USE_SW_WRITE_OFTEN | BO_USE_SW_READ_RARELY | BO_USE_SW_WRITE_RARELY},
+       {DRM_FORMAT_RGB565, DRM_FORMAT_MOD_NONE,
+               BO_USE_RENDERING | BO_USE_SW_READ_OFTEN | BO_USE_SW_WRITE_OFTEN |
+               BO_USE_SW_READ_RARELY | BO_USE_SW_WRITE_RARELY},
+       {DRM_FORMAT_XRGB8888, DRM_FORMAT_MOD_NONE,
+               BO_USE_CURSOR | BO_USE_LINEAR | BO_USE_RENDERING | BO_USE_SW_READ_OFTEN |
+               BO_USE_SW_WRITE_OFTEN | BO_USE_SW_READ_RARELY | BO_USE_SW_WRITE_RARELY},
+};
+
+static int vc4_init(struct driver *drv)
+{
+       drv_insert_combinations(drv, combos, ARRAY_SIZE(combos));
+       return drv_add_kms_flags(drv);
+}
+
+static int vc4_bo_create(struct bo *bo, uint32_t width, uint32_t height,
+                        uint32_t format, uint32_t flags)
+{
+       int ret;
+       size_t plane;
+       struct drm_vc4_create_bo bo_create;
+
+       drv_bo_from_format(bo, width, height, format);
+
+       memset(&bo_create, 0, sizeof(bo_create));
+       bo_create.size = bo->total_size;
+
+       ret = drmIoctl(bo->drv->fd, DRM_IOCTL_VC4_CREATE_BO, &bo_create);
+       if (ret) {
+               fprintf(stderr, "drv: DRM_IOCTL_VC4_GEM_CREATE failed "
+                               "(size=%zu)\n", bo->total_size);
+               return ret;
+       }
+
+       for (plane = 0; plane < bo->num_planes; plane++)
+               bo->handles[plane].u32 = bo_create.handle;
+
+       return 0;
+}
+
+static void *vc4_bo_map(struct bo *bo, struct map_info *data, size_t plane)
+{
+       int ret;
+       struct drm_vc4_mmap_bo bo_map;
+
+       memset(&bo_map, 0, sizeof(bo_map));
+       bo_map.handle = bo->handles[0].u32;
+
+       ret = drmCommandWriteRead(bo->drv->fd, DRM_VC4_MMAP_BO, &bo_map,
+                                 sizeof(bo_map));
+       if (ret) {
+               fprintf(stderr, "drv: DRM_VC4_MMAP_BO failed\n");
+               return MAP_FAILED;
+       }
+
+       data->length = bo->total_size;
+
+       return mmap(0, bo->total_size, PROT_READ | PROT_WRITE, MAP_SHARED,
+                   bo->drv->fd, bo_map.offset);
+}
+
+struct backend backend_vc4 =
+{
+       .name = "vc4",
+       .init = vc4_init,
+       .bo_create = vc4_bo_create,
+       .bo_import = drv_prime_bo_import,
+       .bo_destroy = drv_gem_bo_destroy,
+       .bo_map = vc4_bo_map,
+};
+
+#endif