virgl: make winsys modifications for encoded transfers

The idea is to have two command buffers:

1) One for transfers
2) One for commands, which can include transfers

At flush time, (2) will be filled.  Otherwise, (1) will be
used to submit transfers if there are enough of them.

v2: Pass size directly to cmd_buf_create (@gerddie)
Reviewed-by: Gert Wollny <gert.wollny@collabora.com>

src/gallium/drivers/virgl/virgl_context.c

@@ -1242,7 +1242,7 @@ struct pipe_context *virgl_context_create(struct pipe_screen *pscreen,
    vctx = CALLOC_STRUCT(virgl_context);
    const char *host_debug_flagstring;
 
-   vctx->cbuf = rs->vws->cmd_buf_create(rs->vws);
+   vctx->cbuf = rs->vws->cmd_buf_create(rs->vws, VIRGL_MAX_CMDBUF_DWORDS);
    if (!vctx->cbuf) {
       FREE(vctx);
       return NULL;

src/gallium/drivers/virgl/virgl_winsys.h

@@ -31,7 +31,8 @@ struct pipe_fence_handle;
 struct winsys_handle;
 struct virgl_hw_res;
 
-#define VIRGL_MAX_CMDBUF_DWORDS (64 * 1024)
+#define VIRGL_MAX_TBUF_DWORDS 1024
+#define VIRGL_MAX_CMDBUF_DWORDS ((64 * 1024) + VIRGL_MAX_TBUF_DWORDS)
 
 struct virgl_drm_caps {
    union virgl_caps caps;
@@ -47,6 +48,7 @@ struct virgl_cmd_buf {
 struct virgl_winsys {
    unsigned pci_id;
    int supports_fences; /* In/Out fences are supported */
+   int supports_encoded_transfers; /* Encoded transfers are supported */
 
    void (*destroy)(struct virgl_winsys *vws);
 
@@ -82,7 +84,7 @@ struct virgl_winsys {
                                   uint32_t stride,
                                   struct winsys_handle *whandle);
 
-   struct virgl_cmd_buf *(*cmd_buf_create)(struct virgl_winsys *ws);
+   struct virgl_cmd_buf *(*cmd_buf_create)(struct virgl_winsys *ws, uint32_t size);
    void (*cmd_buf_destroy)(struct virgl_cmd_buf *buf);
 
    void (*emit_res)(struct virgl_winsys *vws, struct virgl_cmd_buf *buf, struct virgl_hw_res *res, boolean write_buffer);

src/gallium/winsys/virgl/drm/virgl_drm_winsys.c

@@ -564,7 +564,8 @@ static void virgl_drm_resource_wait(struct virgl_winsys *qws,
       goto again;
 }
 
-static struct virgl_cmd_buf *virgl_drm_cmd_buf_create(struct virgl_winsys *qws)
+static struct virgl_cmd_buf *virgl_drm_cmd_buf_create(struct virgl_winsys *qws,
+                                                      uint32_t size)
 {
    struct virgl_drm_cmd_buf *cbuf;
 
@@ -587,6 +588,14 @@ static struct virgl_cmd_buf *virgl_drm_cmd_buf_create(struct virgl_winsys *qws)
       return NULL;
    }
 
+   cbuf->buf = CALLOC(size, sizeof(uint32_t));
+   if (!cbuf->buf) {
+      FREE(cbuf->res_hlist);
+      FREE(cbuf->res_bo);
+      FREE(cbuf);
+      return NULL;
+   }
+
    cbuf->base.buf = cbuf->buf;
    cbuf->base.in_fence_fd = -1;
    return &cbuf->base;
@@ -598,6 +607,7 @@ static void virgl_drm_cmd_buf_destroy(struct virgl_cmd_buf *_cbuf)
 
    FREE(cbuf->res_hlist);
    FREE(cbuf->res_bo);
+   FREE(cbuf->buf);
    FREE(cbuf);
 
 }
@@ -930,6 +940,7 @@ virgl_drm_winsys_create(int drmFD)
    qdws->base.fence_server_sync = virgl_fence_server_sync;
    qdws->base.fence_get_fd = virgl_fence_get_fd;
    qdws->base.supports_fences =  drm_version >= VIRGL_DRM_VERSION_FENCE_FD;
+   qdws->base.supports_encoded_transfers = 1;
 
    qdws->base.get_caps = virgl_drm_get_caps;
 

src/gallium/winsys/virgl/drm/virgl_drm_winsys.h

@@ -71,7 +71,7 @@ struct virgl_drm_winsys
 struct virgl_drm_cmd_buf {
    struct virgl_cmd_buf base;
 
-   uint32_t buf[VIRGL_MAX_CMDBUF_DWORDS];
+   uint32_t *buf;
 
    unsigned nres;
    unsigned cres;

src/gallium/winsys/virgl/vtest/virgl_vtest_winsys.c

@@ -411,7 +411,8 @@ alloc:
    return res;
 }
 
-static struct virgl_cmd_buf *virgl_vtest_cmd_buf_create(struct virgl_winsys *vws)
+static struct virgl_cmd_buf *virgl_vtest_cmd_buf_create(struct virgl_winsys *vws,
+                                                        uint32_t size)
 {
    struct virgl_vtest_cmd_buf *cbuf;
 
@@ -700,6 +701,7 @@ virgl_vtest_winsys_wrap(struct sw_winsys *sws)
    vtws->base.fence_wait = virgl_fence_wait;
    vtws->base.fence_reference = virgl_fence_reference;
    vtws->base.supports_fences =  0;
+   vtws->base.supports_encoded_transfers = 0;
 
    vtws->base.flush_frontbuffer = virgl_vtest_flush_frontbuffer;