gallium/ilo: handle query_renderer caps

Implementation based on the classic driver with the following
changes:
 - Use auxiliarry function os_get_total_physical_memory to get the
total amount of memory.
 - Move the libdrm_intel specific get_aperture_size to the winsys.

Cc: Chia-I Wu <olvaffe@gmail.com>
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

src/gallium/drivers/i915/i915_screen.c

@@ -301,7 +301,7 @@ i915_get_param(struct pipe_screen *screen, enum pipe_cap cap)
       if (!os_get_total_physical_memory(&system_memory))
          return 0;
 
-      return MIN2(gpu_mappable_megabytes, (int) (system_memory >> 20));
+      return MIN2(gpu_mappable_megabytes, (int)(system_memory >> 20));
    }
    case PIPE_CAP_UMA:
       return 1;

src/gallium/drivers/ilo/ilo_screen.c

@@ -25,6 +25,7 @@
  *    Chia-I Wu <olv@lunarg.com>
  */
 
+#include "os/os_misc.h"
 #include "util/u_format_s3tc.h"
 #include "vl/vl_decoder.h"
 #include "vl/vl_video_buffer.h"
@@ -436,6 +437,29 @@ ilo_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_TGSI_FS_FINE_DERIVATIVE:
       return 0;
 
+   case PIPE_CAP_VENDOR_ID:
+      return 0x8086;
+   case PIPE_CAP_DEVICE_ID:
+      return is->dev.devid;
+   case PIPE_CAP_ACCELERATED:
+      return true;
+   case PIPE_CAP_VIDEO_MEMORY: {
+      /* Once a batch uses more than 75% of the maximum mappable size, we
+       * assume that there's some fragmentation, and we start doing extra
+       * flushing, etc.  That's the big cliff apps will care about.
+       */
+      const int gpu_mappable_megabytes =
+         intel_winsys_get_aperture_size(is->winsys) * 3 / 4;
+      uint64_t system_memory;
+
+      if (!os_get_total_physical_memory(&system_memory))
+         return 0;
+
+      return MIN2(gpu_mappable_megabytes, (int)(system_memory >> 20));
+   }
+   case PIPE_CAP_UMA:
+      return true;
+
    default:
       return 0;
    }

src/gallium/winsys/intel/drm/intel_drm_winsys.c

@@ -223,6 +223,16 @@ intel_winsys_get_info(const struct intel_winsys *winsys)
    return &winsys->info;
 }
 
+int
+intel_winsys_get_aperture_size(const struct intel_winsys *winsys)
+{
+   size_t aper_size, mappable_size;
+
+   drm_intel_get_aperture_sizes(winsys->fd, &mappable_size, &aper_size);
+
+   return aper_size >> 20;
+}
+
 struct intel_context *
 intel_winsys_create_context(struct intel_winsys *winsys)
 {

src/gallium/winsys/intel/intel_winsys.h

@@ -91,6 +91,9 @@ intel_winsys_destroy(struct intel_winsys *winsys);
 const struct intel_winsys_info *
 intel_winsys_get_info(const struct intel_winsys *winsys);
 
+int
+intel_winsys_get_aperture_size(const struct intel_winsys *winsys);
+
 /**
  * Create a logical context for use with the render ring.
  */