path: root/drivers/gpu/drm/vmwgfx/vmwgfx_binding.c

/**************************************************************************
 *
 * Copyright © 2015 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.
 *
 **************************************************************************/
/*
 * This file implements the vmwgfx context binding manager,
 * The sole reason for having to use this code is that vmware guest
 * backed contexts can be swapped out to their backing mobs by the device
 * at any time, also swapped in at any time. At swapin time, the device
 * validates the context bindings to make sure they point to valid resources.
 * It's this outside-of-drawcall validation (that can happen at any time),
 * that makes this code necessary.
 *
 * We therefore need to kill any context bindings pointing to a resource
 * when the resource is swapped out. Furthermore, if the vmwgfx driver has
 * swapped out the context we can't swap it in again to kill bindings because
 * of backing mob reservation lockdep violations, so as part of
 * context swapout, also kill all bindings of a context, so that they are
 * already killed if a resource to which a binding points
 * needs to be swapped out.
 *
 * Note that a resource can be pointed to by bindings from multiple contexts,
 * Therefore we can't easily protect this data by a per context mutex
 * (unless we use deadlock-safe WW mutexes). So we use a global binding_mutex
 * to protect all binding manager data.
 *
 * Finally, any association between a context and a global resource
 * (surface, shader or even DX query) is conceptually a context binding that
 * needs to be tracked by this code.
 */

#include "vmwgfx_drv.h"
#include "vmwgfx_binding.h"
#include "device_include/svga3d_reg.h"

#define VMW_BINDING_RT_BIT     0
#define VMW_BINDING_PS_BIT     1
#define VMW_BINDING_SO_BIT     2
#define VMW_BINDING_VB_BIT     3
#define VMW_BINDING_NUM_BITS   4

#define VMW_BINDING_PS_SR_BIT  0

/**
 * struct vmw_ctx_binding_state - per context binding state
 *
 * @dev_priv: Pointer to device private structure.
 * @list: linked list of individual active bindings.
 * @render_targets: Render target bindings.
 * @texture_units: Texture units bindings.
 * @ds_view: Depth-stencil view binding.
 * @so_targets: StreamOutput target bindings.
 * @vertex_buffers: Vertex buffer bindings.
 * @index_buffer: Index buffer binding.
 * @per_shader: Per shader-type bindings.
 * @dirty: Bitmap tracking per binding-type changes that have not yet
 * been emitted to the device.
 * @dirty_vb: Bitmap tracking individual vertex buffer binding changes that
 * have not yet been emitted to the device.
 * @bind_cmd_buffer: Scratch space used to construct binding commands.
 * @bind_cmd_count: Number of binding command data entries in @bind_cmd_buffer
 * @bind_first_slot: Used together with @bind_cmd_buffer to indicate the
 * device binding slot of the first command data entry in @bind_cmd_buffer.
 *
 * Note that this structure also provides storage space for the individual
 * struct vmw_ctx_binding objects, so that no dynamic allocation is needed
 * for individual bindings.
 *
 */
struct vmw_ctx_binding_state {
	struct vmw_private *dev_priv;
	struct list_head list;
	struct vmw_ctx_bindinfo_view render_targets[SVGA3D_RT_MAX];
	struct vmw_ctx_bindinfo_tex texture_units[SVGA3D_NUM_TEXTURE_UNITS];
	struct vmw_ctx_bindinfo_view ds_view;
	struct vmw_ctx_bindinfo_so so_targets[SVGA3D_DX_MAX_SOTARGETS];
	struct vmw_ctx_bindinfo_vb vertex_buffers[SVGA3D_DX_MAX_VERTEXBUFFERS];
	struct vmw_ctx_bindinfo_ib index_buffer;
	struct vmw_dx_shader_bindings per_shader[SVGA3D_NUM_SHADERTYPE_DX10];

	unsigned long dirty;
	DECLARE_BITMAP(dirty_vb, SVGA3D_DX_MAX_VERTEXBUFFERS);

	u32 bind_cmd_buffer[VMW_MAX_VIEW_BINDINGS];
	u32 bind_cmd_count;
	u32 bind_first_slot;
};

static int vmw_binding_scrub_shader(struct vmw_ctx_bindinfo *bi, bool rebind);
static int vmw_binding_scrub_render_target(struct vmw_ctx_bindinfo *bi,
					   bool rebind);
static int vmw_binding_scrub_texture(struct vmw_ctx_bindinfo *bi, bool rebind);
static int vmw_binding_scrub_cb(struct vmw_ctx_bindinfo *bi, bool rebind);
static int vmw_binding_scrub_dx_rt(struct vmw_ctx_bindinfo *bi, bool rebind);
static int vmw_binding_scrub_sr(struct vmw_ctx_bindinfo *bi, bool rebind);
static int vmw_binding_scrub_so(struct vmw_ctx_bindinfo *bi, bool rebind);
static int vmw_binding_emit_dirty(struct