virgl: add driver for virtio-gpu 3D (v2)

virgl is the 3D acceleration backend for the
virtio-gpu shipping with qemu.

The 3D acceleration is designed around gallium
and TGSI as the virtualisation layer. The backend
renderer translates the virgl interface into
OpenGL currently.

This is the initial import of the driver to mesa.

The kernel driver portions are lined up for drm-next.

Currently this driver supports up to GL3.3 and some
misc extensions if the host driver exposes it. It is
planned to iterate the virgl API to new GL levels
as mesa host drivers gain features.

v2: fix resource tracking across flushes to avoid
->bind hack in mapping.
consolidate mapping and waiting code for transfers.
use u_range for dirt tracking.
handle larger shaders in protocol.
include virtgpu_drm.h in mesa for now.
add translation layer for gallium tgsi to virgl tgsi.

Signed-off-by: Dave Airlie <[email protected]>

1 files changed, 170 insertions, 0 deletions

diff --git a/src/gallium/drivers/virgl/virgl_buffer.c b/src/gallium/drivers/virgl/virgl_buffer.c
new file mode 100644
index 00000000000..93fb29598a9
--- /dev/null
+++ b/src/gallium/drivers/virgl/virgl_buffer.c
@@ -0,0 +1,170 @@
+/*
+ * Copyright 2014, 2015 Red Hat.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * on the rights to use, copy, modify, merge, publish, distribute, sub
+ * license, and/or sell copies of the Software, and to permit persons to whom
+ * the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "util/u_memory.h"
+#include "virgl_context.h"
+#include "virgl_resource.h"
+
+static void virgl_buffer_destroy(struct pipe_screen *screen,
+                                 struct pipe_resource *buf)
+{
+   struct virgl_screen *vs = virgl_screen(screen);
+   struct virgl_buffer *vbuf = virgl_buffer(buf);
+
+   util_range_destroy(&vbuf->valid_buffer_range);
+   vs->vws->resource_unref(vs->vws, vbuf->base.hw_res);
+   FREE(vbuf);
+}
+
+static void *virgl_buffer_transfer_map(struct pipe_context *ctx,
+                                       struct pipe_resource *resource,
+                                       unsigned level,
+                                       unsigned usage,
+                                       const struct pipe_box *box,
+                                       struct pipe_transfer **transfer)
+{
+   struct virgl_context *vctx = (struct virgl_context *)ctx;
+   struct virgl_screen *vs = virgl_screen(ctx->screen);
+   struct virgl_buffer *vbuf = virgl_buffer(resource);
+   struct virgl_transfer *trans;
+   void *ptr;
+   bool readback;
+   uint32_t offset;
+   bool doflushwait = false;
+
+   if ((usage & PIPE_TRANSFER_READ) && (vbuf->on_list == TRUE))
+      doflushwait = true;
+   else
+      doflushwait = virgl_res_needs_flush_wait(vctx, &vbuf->base, usage);
+
+   if (doflushwait)
+      ctx->flush(ctx, NULL, 0);
+
+   trans = util_slab_alloc(&vctx->texture_transfer_pool);
+   if (trans == NULL)
+      return NULL;
+
+   trans->base.resource = resource;
+   trans->base.level = level;
+   trans->base.usage = usage;
+   trans->base.box = *box;
+   trans->base.stride = 0;
+   trans->base.layer_stride = 0;
+
+   offset = box->x;
+
+   readback = virgl_res_needs_readback(vctx, &vbuf->base, usage);
+   if (readback)
+      vs->vws->transfer_get(vs->vws, vbuf->base.hw_res, box, trans->base.stride, trans->base.layer_stride, offset, level);
+
+   if (!(usage & PIPE_TRANSFER_UNSYNCHRONIZED))
+      doflushwait = true;
+
+   if (doflushwait || readback)
+      vs->vws->resource_wait(vs->vws, vbuf->base.hw_res);
+
+   ptr = vs->vws->resource_map(vs->vws, vbuf->base.hw_res);
+   if (!ptr) {
+      return NULL;
+   }
+
+   trans->offset = offset;
+   *transfer = &trans->base;
+
+   return ptr + trans->offset;
+}
+
+static void virgl_buffer_transfer_unmap(struct pipe_context *ctx,
+                                        struct pipe_transfer *transfer)
+{
+   struct virgl_context *vctx = (struct virgl_context *)ctx;
+   struct virgl_transfer *trans = (struct virgl_transfer *)transfer;
+   struct virgl_buffer *vbuf = virgl_buffer(transfer->resource);
+
+   if (trans->base.usage & PIPE_TRANSFER_WRITE) {
+      if (!(transfer->usage & PIPE_TRANSFER_FLUSH_EXPLICIT)) {
+         struct virgl_screen *vs = virgl_screen(ctx->screen);
+         vbuf->base.clean = FALSE;
+         vctx->num_transfers++;
+         vs->vws->transfer_put(vs->vws, vbuf->base.hw_res,
+                               &transfer->box, trans->base.stride, trans->base.layer_stride, trans->offset, transfer->level);
+
+      }
+   }
+
+   util_slab_free(&vctx->texture_transfer_pool, trans);
+}
+
+static void virgl_buffer_transfer_flush_region(struct pipe_context *ctx,
+                                               struct pipe_transfer *transfer,
+                                               const struct pipe_box *box)
+{
+   struct virgl_context *vctx = (struct virgl_context *)ctx;
+   struct virgl_buffer *vbuf = virgl_buffer(transfer->resource);
+
+   if (!vbuf->on_list) {
+       struct pipe_resource *res = NULL;
+
+       list_addtail(&vbuf->flush_list, &vctx->to_flush_bufs);
+       vbuf->on_list = TRUE;
+       pipe_resource_reference(&res, &vbuf->base.u.b);
+   }
+
+   util_range_add(&vbuf->valid_buffer_range, transfer->box.x + box->x,
+                  transfer->box.x + box->x + box->width);
+
+   vbuf->base.clean = FALSE;
+}
+
+static const struct u_resource_vtbl virgl_buffer_vtbl =
+{
+   u_default_resource_get_handle,            /* get_handle */
+   virgl_buffer_destroy,                     /* resource_destroy */
+   virgl_buffer_transfer_map,                /* transfer_map */
+   virgl_buffer_transfer_flush_region,       /* transfer_flush_region */
+   virgl_buffer_transfer_unmap,              /* transfer_unmap */
+   virgl_transfer_inline_write               /* transfer_inline_write */
+};
+
+struct pipe_resource *virgl_buffer_create(struct virgl_screen *vs,
+                                          const struct pipe_resource *template)
+{
+   struct virgl_buffer *buf;
+   uint32_t size;
+   uint32_t vbind;
+   buf = CALLOC_STRUCT(virgl_buffer);
+   buf->base.clean = TRUE;
+   buf->base.u.b = *template;
+   buf->base.u.b.screen = &vs->base;
+   buf->base.u.vtbl = &virgl_buffer_vtbl;
+   pipe_reference_init(&buf->base.u.b.reference, 1);
+   util_range_init(&buf->valid_buffer_range);
+
+   vbind = pipe_to_virgl_bind(template->bind);
+   size = template->width0;
+
+   buf->base.hw_res = vs->vws->resource_create(vs->vws, template->target, template->format, vbind, template->width0, 1, 1, 1, 0, 0, size);
+
+   util_range_set_empty(&buf->valid_buffer_range);
+   return &buf->base.u.b;
+}