iris: Support virtio-gpu native context

Add virtio-gpu native context support to Iris driver.

Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29870>

src/gallium/auxiliary/target-helpers/drm_helper.h

@@ -92,7 +92,8 @@ pipe_iris_create_screen(int fd, const struct pipe_screen_config *config)
 const driOptionDescription iris_driconf[] = {
       #include "iris/driinfo_iris.h"
 };
-DRM_DRIVER_DESCRIPTOR(iris, iris_driconf, ARRAY_SIZE(iris_driconf))
+DRM_DRIVER_DESCRIPTOR(iris, iris_driconf, ARRAY_SIZE(iris_driconf),
+                      .probe_nctx = iris_drm_probe_nctx)
 
 #else
 DRM_DRIVER_DESCRIPTOR_STUB(iris)

src/gallium/drivers/iris/i915/iris_kmd_backend.c

@@ -215,9 +215,15 @@ i915_gem_mmap_offset(struct iris_bufmgr *bufmgr, struct iris_bo *bo)
       return NULL;
    }
 
+   void *map;
+
    /* And map it */
-   void *map = mmap(0, bo->size, PROT_READ | PROT_WRITE, MAP_SHARED,
-                    iris_bufmgr_get_fd(bufmgr), mmap_arg.offset);
+   if (iris_bufmgr_get_device_info(bufmgr)->is_virtio)
+      map = intel_virtio_bo_mmap(iris_bufmgr_get_fd(bufmgr),
+                                 bo->gem_handle, bo->size, NULL);
+   else
+      map = mmap(0, bo->size, PROT_READ | PROT_WRITE, MAP_SHARED,
+                 iris_bufmgr_get_fd(bufmgr), mmap_arg.offset);
    if (map == MAP_FAILED) {
       DBG("%s:%d: Error mapping buffer %d (%s): %s .\n",
           __FILE__, __LINE__, bo->gem_handle, bo->name, strerror(errno));

src/gallium/drivers/iris/iris_bufmgr.c

@@ -1928,6 +1928,8 @@ iris_bufmgr_destroy(struct iris_bufmgr *bufmgr)
 
    iris_bufmgr_destroy_global_vm(bufmgr);
 
+   intel_virtio_unref_fd(bufmgr->fd);
+
    close(bufmgr->fd);
 
    simple_mtx_unlock(&bufmgr->lock);
@@ -2424,6 +2426,8 @@ iris_bufmgr_create(struct intel_device_info *devinfo, int fd, bool bo_reuse)
    if (bufmgr->fd == -1)
       goto error_dup;
 
+   intel_virtio_ref_fd(bufmgr->fd);
+
    p_atomic_set(&bufmgr->refcount, 1);
 
    simple_mtx_init(&bufmgr->lock, mtx_plain);
@@ -2591,6 +2595,7 @@ error_bucket_cache:
       util_vma_heap_finish(&bufmgr->vma_allocator[i]);
    iris_bufmgr_destroy_global_vm(bufmgr);
 error_init_vm:
+   intel_virtio_unref_fd(bufmgr->fd);
    close(bufmgr->fd);
 error_dup:
    free(bufmgr);

src/gallium/drivers/iris/iris_screen.c

@@ -523,6 +523,7 @@ iris_screen_destroy(struct iris_screen *screen)
    u_transfer_helper_destroy(screen->base.transfer_helper);
    iris_bufmgr_unref(screen->bufmgr);
    disk_cache_destroy(screen->disk_cache);
+   intel_virtio_unref_fd(screen->winsys_fd);
    close(screen->winsys_fd);
    ralloc_free(screen);
 }
@@ -667,6 +668,9 @@ iris_screen_create(int fd, const struct pipe_screen_config *config)
       break;
    }
 
+   if (intel_virtio_init_fd(fd) < 0)
+      return NULL;
+
    process_intel_debug_variable();
 
    screen->bufmgr = iris_bufmgr_get_for_fd(fd, bo_reuse);

src/gallium/drivers/iris/iris_screen.h

@@ -11,6 +11,7 @@
 #include "util/slab.h"
 #include "util/u_screen.h"
 #include "intel/dev/intel_device_info.h"
+#include "intel/dev/virtio/intel_virtio.h"
 #include "intel/isl/isl.h"
 #include "iris_bufmgr.h"
 #include "iris_binder.h"

src/gallium/winsys/iris/drm/iris_drm_public.h

@@ -24,10 +24,16 @@
 #ifndef IRIS_DRM_PUBLIC_H
 #define IRIS_DRM_PUBLIC_H
 
+#include <stdbool.h>
+
 struct pipe_screen;
 struct pipe_screen_config;
+struct virgl_renderer_capset_drm;
 
 struct pipe_screen *
 iris_drm_screen_create(int drm_fd, const struct pipe_screen_config *config);
 
+bool
+iris_drm_probe_nctx(int fd, const struct virgl_renderer_capset_drm *caps);
+
 #endif /* IRIS_DRM_PUBLIC_H */

src/gallium/winsys/iris/drm/iris_drm_winsys.c

@@ -21,11 +21,16 @@
  * IN THE SOFTWARE.
  */
 
+#include <stdint.h>
 #include <unistd.h>
 #include <fcntl.h>
 
+#include "intel/dev/intel_device_info.h"
+
 #include "util/os_file.h"
 
+#include "virtio/virtio-gpu/drm_hw.h"
+
 #include "iris_drm_public.h"
 extern struct pipe_screen *iris_screen_create(int fd, const struct pipe_screen_config *config);
 
@@ -34,3 +39,32 @@ iris_drm_screen_create(int fd, const struct pipe_screen_config *config)
 {
    return iris_screen_create(fd, config);
 }
+
+/**
+ * Check if the native-context type exposed by virtgpu is one we
+ * support, and that we support the underlying device.
+ */
+bool
+iris_drm_probe_nctx(int fd, const struct virgl_renderer_capset_drm *caps)
+{
+#ifdef HAVE_INTEL_VIRTIO
+   if (caps->context_type != VIRTGPU_DRM_CONTEXT_I915)
+      return false;
+
+   if (debug_get_bool_option("INTEL_VIRTIO_DISABLE", false))
+      return false;
+
+   struct intel_device_info devinfo;
+
+   if (!intel_get_device_info_from_pci_id(caps->u.intel.pci_device_id,
+                                          &devinfo))
+      return false;
+
+   if (devinfo.ver < 8 || devinfo.platform == INTEL_PLATFORM_CHV)
+      return false;
+
+   return true;
+#else
+   return false;
+#endif
+}

src/gallium/winsys/iris/drm/meson.build

@@ -9,5 +9,6 @@ libiriswinsys = static_library(
     inc_gallium, inc_gallium_aux, inc_gallium_drivers,
   ],
   gnu_symbol_visibility : 'hidden',
-  dependencies: idep_mesautil,
+  dependencies: [idep_intel_dev, idep_mesautil],
+  link_with : [libintel_dev],
 )