drm/vmwgfx: Add DRM driver for VMware Virtual GPU

This commit adds the vmwgfx driver for the VWware Virtual GPU aka SVGA.
The driver is under staging the same as Nouveau and Radeon KMS. Hopefully
the 2D ioctls are bug free and don't need changing, so that part of the
API should be stable. But there there is a pretty big chance that the 3D API
will change in the future.

Signed-off-by: Thomas Hellström <thellstrom@vmware.com>
Signed-off-by: Jakob Bornecrantz <jakob@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 229 insertions, 0 deletions

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c b/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c
new file mode 100644
index 00000000000..d6f2d2b882e
--- /dev/null
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c
@@ -0,0 +1,229 @@
+/**************************************************************************
+ *
+ * Copyright © 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * 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 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 COPYRIGHT HOLDERS, AUTHORS AND/OR ITS 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 "vmwgfx_drv.h"
+#include "ttm/ttm_bo_driver.h"
+#include "ttm/ttm_placement.h"
+
+static uint32_t vram_placement_flags = TTM_PL_FLAG_VRAM |
+        TTM_PL_FLAG_CACHED;
+
+static uint32_t vram_ne_placement_flags = TTM_PL_FLAG_VRAM |
+        TTM_PL_FLAG_CACHED |
+        TTM_PL_FLAG_NO_EVICT;
+
+static uint32_t sys_placement_flags = TTM_PL_FLAG_SYSTEM |
+        TTM_PL_FLAG_CACHED;
+
+struct ttm_placement vmw_vram_placement = {
+        .fpfn = 0,
+        .lpfn = 0,
+        .num_placement = 1,
+        .placement = &vram_placement_flags,
+        .num_busy_placement = 1,
+        .busy_placement = &vram_placement_flags
+};
+
+struct ttm_placement vmw_vram_ne_placement = {
+        .fpfn = 0,
+        .lpfn = 0,
+        .num_placement = 1,
+        .placement = &vram_ne_placement_flags,
+        .num_busy_placement = 1,
+        .busy_placement = &vram_ne_placement_flags
+};
+
+struct ttm_placement vmw_sys_placement = {
+        .fpfn = 0,
+        .lpfn = 0,
+        .num_placement = 1,
+        .placement = &sys_placement_flags,
+        .num_busy_placement = 1,
+        .busy_placement = &sys_placement_flags
+};
+
+struct vmw_ttm_backend {
+        struct ttm_backend backend;
+};
+
+static int vmw_ttm_populate(struct ttm_backend *backend,
+                            unsigned long num_pages, struct page **pages,
+                            struct page *dummy_read_page)
+{
+        return 0;
+}
+
+static int vmw_ttm_bind(struct ttm_backend *backend, struct ttm_mem_reg *bo_mem)
+{
+        return 0;
+}
+
+static int vmw_ttm_unbind(struct ttm_backend *backend)
+{
+        return 0;
+}
+
+static void vmw_ttm_clear(struct ttm_backend *backend)
+{
+}
+
+static void vmw_ttm_destroy(struct ttm_backend *backend)
+{
+        struct vmw_ttm_backend *vmw_be =
+            container_of(backend, struct vmw_ttm_backend, backend);
+
+        kfree(vmw_be);
+}
+
+static struct ttm_backend_func vmw_ttm_func = {
+        .populate = vmw_ttm_populate,
+        .clear = vmw_ttm_clear,
+        .bind = vmw_ttm_bind,
+        .unbind = vmw_ttm_unbind,
+        .destroy = vmw_ttm_destroy,
+};
+
+struct ttm_backend *vmw_ttm_backend_init(struct ttm_bo_device *bdev)
+{
+        struct vmw_ttm_backend *vmw_be;
+
+        vmw_be = kmalloc(sizeof(*vmw_be), GFP_KERNEL);
+        if (!vmw_be)
+                return NULL;
+
+        vmw_be->backend.func = &vmw_ttm_func;
+
+        return &vmw_be->backend;
+}
+
+int vmw_invalidate_caches(struct ttm_bo_device *bdev, uint32_t flags)
+{
+        return 0;
+}
+
+int vmw_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
+                      struct ttm_mem_type_manager *man)
+{
+        struct vmw_private *dev_priv =
+            container_of(bdev, struct vmw_private, bdev);
+
+        switch (type) {
+        case TTM_PL_SYSTEM:
+                /* System memory */
+
+                man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
+                man->available_caching = TTM_PL_MASK_CACHING;
+                man->default_caching = TTM_PL_FLAG_CACHED;
+                break;
+        case TTM_PL_VRAM:
+                /* "On-card" video ram */
+                man->gpu_offset = 0;
+                man->io_offset = dev_priv->vram_start;
+                man->io_size = dev_priv->vram_size;
+                man->flags = TTM_MEMTYPE_FLAG_FIXED |
+                    TTM_MEMTYPE_FLAG_NEEDS_IOREMAP | TTM_MEMTYPE_FLAG_MAPPABLE;
+                man->io_addr = NULL;
+                man->available_caching = TTM_PL_MASK_CACHING;
+                man->default_caching = TTM_PL_FLAG_WC;
+                break;
+        default:
+                DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
+                return -EINVAL;
+        }
+        return 0;
+}
+
+void vmw_evict_flags(struct ttm_buffer_object *bo,
+                     struct ttm_placement *placement)
+{
+        *placement = vmw_sys_placement;
+}
+
+/**
+ * FIXME: Proper access checks on buffers.
+ */
+
+static int vmw_verify_access(struct ttm_buffer_object *bo, struct file *filp)
+{
+        return 0;
+}
+
+/**
+ * FIXME: We're using the old vmware polling method to sync.
+ * Do this with fences instead.
+ */
+
+static void *vmw_sync_obj_ref(void *sync_obj)
+{
+        return sync_obj;
+}
+
+static void vmw_sync_obj_unref(void **sync_obj)
+{
+        *sync_obj = NULL;
+}
+
+static int vmw_sync_obj_flush(void *sync_obj, void *sync_arg)
+{
+        struct vmw_private *dev_priv = (struct vmw_private *)sync_arg;
+
+        mutex_lock(&dev_priv->hw_mutex);
+        vmw_write(dev_priv, SVGA_REG_SYNC, SVGA_SYNC_GENERIC);
+        mutex_unlock(&dev_priv->hw_mutex);
+        return 0;
+}
+
+static bool vmw_sync_obj_signaled(void *sync_obj, void *sync_arg)
+{
+        struct vmw_private *dev_priv = (struct vmw_private *)sync_arg;
+        uint32_t sequence = (unsigned long) sync_obj;
+
+        return vmw_fence_signaled(dev_priv, sequence);
+}
+
+static int vmw_sync_obj_wait(void *sync_obj, void *sync_arg,
+                             bool lazy, bool interruptible)
+{
+        struct vmw_private *dev_priv = (struct vmw_private *)sync_arg;
+        uint32_t sequence = (unsigned long) sync_obj;
+
+        return vmw_wait_fence(dev_priv, false, sequence, false, 3*HZ);
+}
+
+struct ttm_bo_driver vmw_bo_driver = {
+        .create_ttm_backend_entry = vmw_ttm_backend_init,
+        .invalidate_caches = vmw_invalidate_caches,
+        .init_mem_type = vmw_init_mem_type,
+        .evict_flags = vmw_evict_flags,
+        .move = NULL,
+        .verify_access = vmw_verify_access,
+        .sync_obj_signaled = vmw_sync_obj_signaled,
+        .sync_obj_wait = vmw_sync_obj_wait,
+        .sync_obj_flush = vmw_sync_obj_flush,
+        .sync_obj_unref = vmw_sync_obj_unref,
+        .sync_obj_ref = vmw_sync_obj_ref
+};