vrend: Introudce VIRGL_CAP_V2_VIDEO_MEMORY to query video memory

This will allow for the virgl userspace driver to be able to respond
to PIPE_CAP_VIDEO_MEMORY requests.

Signed-off-by: Rohan Garg <rohan.garg@collabora.com>
Reviewed-by: Gert Wollny <gert.wollny@collabora.com>

src/virgl_hw.h

@@ -408,6 +408,7 @@ enum virgl_formats {
 /* These are used by the capability_bits_v2 field in virgl_caps_v2. */
 #define VIRGL_CAP_V2_BLEND_EQUATION       (1 << 0)
 #define VIRGL_CAP_V2_UNTYPED_RESOURCE     (1 << 1)
+#define VIRGL_CAP_V2_VIDEO_MEMORY         (1 << 2)
 
 /* virgl bind flags - these are compatible with mesa 10.5 gallium.
  * but are fixed, no other should be passed to virgl either.
@@ -559,6 +560,7 @@ struct virgl_caps_v2 {
         uint32_t host_feature_check_version;
         struct virgl_supported_format_mask supported_readback_formats;
         struct virgl_supported_format_mask scanout;
+        uint32_t max_video_memory;
         uint32_t capability_bits_v2;
 };
 

src/vrend_renderer.c

@@ -58,6 +58,10 @@
 
 #include "tgsi/tgsi_text.h"
 
+#ifdef HAVE_EPOXY_GLX_H
+#include <epoxy/glx.h>
+#endif
+
 /*
  * VIRGL_RENDERER_CAPSET_VIRGL has version 0 and 1, but they are both
  * virgl_caps_v1 and are exactly the same.
@@ -9984,6 +9988,7 @@ static void vrend_renderer_fill_caps_v2(int gl_ver, int gles_ver,  union virgl_c
 {
    GLint max;
    GLfloat range[2];
+   uint32_t video_memory;
 
    /* Count this up when you add a feature flag that is used to set a CAP in
     * the guest that was set unconditionally before. Then check that flag and
@@ -10289,6 +10294,12 @@ static void vrend_renderer_fill_caps_v2(int gl_ver, int gles_ver,  union virgl_c
    if (egl)
       caps->v2.capability_bits_v2 |= VIRGL_CAP_V2_UNTYPED_RESOURCE;
 #endif
+
+   video_memory = vrend_winsys_query_video_memory();
+   if (video_memory) {
+      caps->v2.capability_bits_v2 |= VIRGL_CAP_V2_VIDEO_MEMORY;
+      caps->v2.max_video_memory = video_memory;
+   }
 }
 
 void vrend_renderer_fill_caps(uint32_t set, uint32_t version,

src/vrend_winsys.c

@@ -198,3 +198,12 @@ int vrend_winsys_get_fd_for_texture2(uint32_t tex_id, int *fd, int *stride, int
    return -1;
 #endif
 }
+
+uint32_t vrend_winsys_query_video_memory(void)
+{
+#ifdef HAVE_EPOXY_GLX_H
+   return virgl_glx_query_video_memory(glx_info);
+#else
+   return 0;
+#endif
+}

src/vrend_winsys.h

@@ -58,4 +58,6 @@ int vrend_winsys_get_fourcc_for_texture(uint32_t tex_id, uint32_t format, int *f
 int vrend_winsys_get_fd_for_texture(uint32_t tex_id, int *fd);
 int vrend_winsys_get_fd_for_texture2(uint32_t tex_id, int *fd, int *stride, int *offset);
 
+uint32_t vrend_winsys_query_video_memory(void);
+
 #endif /* VREND_WINSYS_H */

src/vrend_winsys_glx.c

@@ -102,3 +102,15 @@ int virgl_glx_make_context_current(struct virgl_glx *d, virgl_renderer_gl_contex
 {
    return glXMakeContextCurrent(d->display, d->pbuffer, d->pbuffer, virglctx);
 }
+
+uint32_t virgl_glx_query_video_memory(struct virgl_glx *d)
+{
+   uint32_t video_memory = 0;
+   if (d) {
+      if (epoxy_has_glx_extension(d->display, DefaultScreen(d->display), "GLX_MESA_query_renderer")) {
+         glXQueryCurrentRendererIntegerMESA(GLX_RENDERER_VIDEO_MEMORY_MESA, &video_memory);
+      }
+   }
+
+   return video_memory;
+}

src/vrend_winsys_glx.h

@@ -33,5 +33,6 @@ void virgl_glx_destroy(struct virgl_glx *ve);
 virgl_renderer_gl_context virgl_glx_create_context(struct virgl_glx *ve, struct virgl_gl_ctx_param *vparams);
 void virgl_glx_destroy_context(struct virgl_glx *ve, virgl_renderer_gl_context virglctx);
 int virgl_glx_make_context_current(struct virgl_glx *ve, virgl_renderer_gl_context virglctx);
+uint32_t virgl_glx_query_video_memory(struct virgl_glx *ve);
 
 #endif