anv: Advertise larger heap sizes

Instead of just advertising the aperture size, we do something more
intelligent.  On systems with a full 48-bit PPGTT, we can address 100%
of the available system RAM from the GPU.  In order to keep clients from
burning 100% of your available RAM for graphics resources, we have a
nice little heuristic (which has received exactly zero tuning) to keep
things under a reasonable level of control.

Reviewed-by: Kristian H. Kristensen <[email protected]>

1 files changed, 16 insertions, 0 deletions

diff --git a/src/intel/vulkan/anv_gem.c b/src/intel/vulkan/anv_gem.c
index 6a996ea3db8..2d07a3dbb0e 100644
--- a/src/intel/vulkan/anv_gem.c
+++ b/src/intel/vulkan/anv_gem.c
@@ -288,6 +288,22 @@ anv_gem_destroy_context(struct anv_device *device, int context)
 }
 
 int
+anv_gem_get_context_param(int fd, int context, uint32_t param, uint64_t *value)
+{
+   struct drm_i915_gem_context_param gp = {
+      .ctx_id = context,
+      .param = param,
+   };
+
+   int ret = anv_ioctl(fd, DRM_IOCTL_I915_GEM_CONTEXT_GETPARAM, &gp);
+   if (ret == -1)
+      return -1;
+
+   *value = gp.value;
+   return 0;
+}
+
+int
 anv_gem_get_aperture(int fd, uint64_t *size)
 {
    struct drm_i915_gem_get_aperture aperture = { 0 };