[Mesa-dev] [PATCH v2 4/5] panfrost: Mark buffers as PANFROST_BO_HEAP

[Tomeu Vizoso]

What we call GROWABLE in Mesa corresponds to the HEAP BO flag in the
kernel. These buffers cannot be memory mapped in the CPU side at the
moment, so make sure they are also marked INVISIBLE.

This allows us to allocate a big heap upfront (16MB) without actually
reserving space unless it's needed.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso at collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig at collabora.com>
---
 src/gallium/drivers/panfrost/pan_drm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/gallium/drivers/panfrost/pan_drm.c b/src/gallium/drivers/panfrost/pan_drm.c
index 6d1e0c08d33d..71eda2d1e328 100644
--- a/src/gallium/drivers/panfrost/pan_drm.c
+++ b/src/gallium/drivers/panfrost/pan_drm.c
@@ -91,10 +91,16 @@ panfrost_drm_create_bo(struct panfrost_screen *screen, size_t size,
         /* To maximize BO cache usage, don't allocate tiny BOs */
         size = MAX2(size, 4096);
 
+        /* GROWABLE BOs cannot be mmapped */
+        if (flags & PAN_ALLOCATE_GROWABLE)
+                assert(flags & PAN_ALLOCATE_INVISIBLE);
+
         unsigned translated_flags = 0;
 
         if (screen->kernel_version->version_major > 1 ||
             screen->kernel_version->version_minor >= 1) {
+                if (flags & PAN_ALLOCATE_GROWABLE)
+                        translated_flags |= PANFROST_BO_HEAP;
                 if (!(flags & PAN_ALLOCATE_EXECUTE))
                         translated_flags |= PANFROST_BO_NOEXEC;
         }
-- 
2.20.1