// SPDX-License-Identifier: GPL-2.0 OR MIT
/**************************************************************************
*
* Copyright 2014-2023 VMware, Inc., Palo Alto, CA., USA
*
* 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.
*
**************************************************************************/
/*
* Treat context OTables as resources to make use of the resource
* backing MOB eviction mechanism, that is used to read back the COTable
* whenever the backing MOB is evicted.
*/
#include "vmwgfx_bo.h"
#include "vmwgfx_drv.h"
#include "vmwgfx_mksstat.h"
#include "vmwgfx_resource_priv.h"
#include "vmwgfx_so.h"
#include <drm/ttm/ttm_placement.h>
/**
* struct vmw_cotable - Context Object Table resource
*
* @res: struct vmw_resource we are deriving from.
* @ctx: non-refcounted pointer to the owning context.
* @size_read_back: Size of data read back during eviction.
* @seen_entries: Seen entries in command stream for this cotable.
* @type: The cotable type.
* @scrubbed: Whether the cotable has been scrubbed.
* @resource_list: List of resources in the cotable.
*/
struct vmw_cotable {
struct vmw_resource res;
struct vmw_resource *ctx;
size_t size_read_back;
int seen_entries;
u32 type;
bool scrubbed;
struct list_head resource_list;
};
/**
* struct vmw_cotable_info - Static info about cotable types
*
* @min_initial_entries: Min number of initial intries at cotable allocation
* for this cotable type.
* @size: Size of each entry.
* @unbind_func: Unbind call-back function.
*/
struct vmw_cotable_info {
u32 min_initial_entries;
u32 size;
void (*unbind_func)(struct vmw_private *, struct list_head *,
bool);
};
/*
* Getting the initial size right is difficult because it all depends
* on what the userspace is doing. The sizes will be aligned up to
* a PAGE_SIZE so we just want to make sure that for majority of apps
* the initial number of entries doesn't require an immediate resize.
* For all cotables except SVGACOTableDXElementLayoutEntry and
* SVGACOTableDXBlendStateEntry the initial number of entries fits
* within the PAGE_SIZE. For SVGACOTableDXElementLayoutEntry and
* SVGACOTableDXBlendStateEntry we want to reserve two pages,
* because that's what all apps will require initially.
*/
static const struct vmw_cotable_info co_info[] = {
{1, sizeof(SVGACOTableDXRTViewEntry), &vmw_view_cotable_list_destroy},
{1, sizeof(SVGACOTableDXDSViewEntry), &vmw_view_cotable_list_destroy},
{1, sizeof(SVGACOTableDXSRViewEntry), &vmw_view_cotable_list_destroy},
{PAGE_SIZE/sizeof(SVGACOTableDXElementLayoutEntry) + 1, sizeof(SVGACOTableDXElementLayoutEntry), NULL},
{PAGE_SIZE/sizeof(SVGACOTableDXBlendStateEntry) + 1, sizeof(SVGACOTableDXBlendStateEntry), NULL},
{1, sizeof(SVGACOTableDXDepthStencilEntry), NULL},
{1, sizeof(SVGACOTableDXRasterizerStateEntry), NULL},
{1, sizeof(SVGACOTableDXSamplerEntry), NULL},
{1, sizeof(SVGACOTableDXStreamOutputEntry), &vmw_dx_streamoutput_cotable_list_scrub},
{1, sizeof(SVGACOTableDXQueryEntry), NULL},
{1, sizeof(SVGACOTableDXShaderEntry), &vmw_dx_shader_cotable_list_scrub},
{1, sizeof(SVGACOTableDXUAViewEntry), &vmw_view_cotable_list_destroy}
};
/*
* Cotables with bindings that we remove must be scrubbed first,
* otherwise, the device will swap in an invalid context when we remove
* bindings before scrubbing a cotable...
*/
const SVGACOTableType vmw_cotable_scrub_order[] = {
SVGA_COTABLE_RTVIEW,
SVGA_COTABLE_DSVIEW,
SVGA_COTABLE_SRVIEW,
SVGA_COTABLE_DXSHADER,
SVGA_COTABLE_ELEMENTLAYOUT,
SVGA_COTABLE_BLENDSTATE,
SVGA_COTABLE_DEPTHSTENCIL,
SVGA_COTABLE_RASTERIZERSTATE,
SVGA_COTABLE_SAMPLER,
SVGA_COTABLE_STREAMOUTPUT,
SVGA_COTABLE_DXQUERY,
SVGA_COTABLE_UAVIEW,
};
static int vmw_cotable_bind(struct vmw_resource *res,
struct ttm_validate_buffer *val_buf);
static int vmw_cotable_unbind(struct vmw_resource *res,
bool readback,
struct ttm_validate_buffer *val_buf);
static int vmw_cotable_create(struct vmw_resource *res);
static int vmw_cotable_destroy(struct vmw_resource *res);
static const struct vmw_res_func vmw_cotable_func = {
.res_type = vmw_res_cotable,
.needs_guest_memory = true,
.may_evict = true,
.prio = 3,
.dirty_prio = 3,
.type_name = "context guest backed object tables",
.domain = VMW_BO_DOMAIN_MOB,
.busy_domain = VMW_BO_DOMAIN_MOB,
.create = vmw_cotable_create,
.destroy = vmw_cotable_destroy,
.bind = vmw_cotable_bind,
.unbind = vmw_cotable_unbind,
};
/**
* vmw_cotable - Convert a struct vmw_resource pointer to a struct
* vmw_cotable pointer
*
* @res: Pointer to the resource.
*/
static struct vmw_cotable *vmw_cotable(struct vmw_resource *res)
{
return container_of(res, struct vmw_cotable, res);
}
/**
* vmw_cotable_destroy - Cotable resource destroy callback
*
* @res: Pointer to the cotable resource.
*
* There is no device cotable destroy command, so this function only
* makes sure that the resource id is set to invalid.
*/
static int vmw_cotable_destroy(struct vmw_resource *res)
{
res->id = -1;
return 0;
}
/**
* vmw_cotable_unscrub - Undo a cotable unscrub operation
*
* @res: Pointer to the cotable resource
*
* This function issues commands to (re)bind the cotable to
* its backing mob, which needs to be validated and reserved at this point.
* This is identical to bind() except the function interface looks different.
*/
static int vmw_cotable_unscrub(struct vmw_resource *res)
{
struct vmw_cotable *vcotbl = vmw_cotable(res);
struct vmw_private *dev_priv = res->dev_priv;
struct ttm_buffer_object *bo = &res->guest_memory_bo->tbo;
struct {
SVGA3dCmdHeader header;
SVGA3dCmdDXSetCOTable body;
} *cmd;
WARN_ON_ONCE(bo->resource->mem_type != VMW_PL_MOB);
dma_resv_assert_held(bo->base.resv);
cmd = VMW_CMD_RESERVE(dev_priv, sizeof(*cmd));
if (!cmd)
return -ENOMEM;
WARN_ON(vcotbl->ctx->id == SVGA3D_INVALID_ID);
WARN_ON(bo->resource->mem_type != VMW_PL_MOB);
cmd->header.id = SVGA_3D_CMD_DX_SET_COTABLE;
cmd->header.size = sizeof(cmd->body);
cmd->body.cid = vcotbl->ctx->id;
cmd->body.type = vcotbl->type;
cmd->body.mobid = bo->resource->start;
cmd->body.validSizeInBytes = vcotbl->size_read_back;
vmw_cmd_commit_flush(dev_priv, sizeof(*cmd));
vcotbl->scrubbed = false;
return 0;
}
/**
* vmw_cotable_bind - Undo a cotable unscrub operation
*
* @res: Pointer to the cotable resource
* @val_buf: Pointer to a struct ttm_validate_buffer prepared by the caller
* for convenience / fencing.
*
* This function issues commands to (re)bind the cotable to
* its backing mob, which needs to be validated and reserved at this point.
*/
static int vmw_cotable_bind(struct vmw_resource *res,
struct ttm_validate_buffer *val_buf)
{
/*
* The create() callback may have changed @res->backup without
* the caller noticing, and with val_buf->bo still pointing to
* the old backup buffer. Although hackish, and not used currently,
* take the opportunity to correct the value here so that it's not
* misused in the future.
*/
val_buf->bo = &res->guest_memory_bo->tbo;
return vmw_cotable_unscrub(res);
}
/**
* vmw_cotable_scrub - Scrub the cotable from the device.
*
* @res: Pointer to the cotable resource.
* @readback: Whether initiate a readback of the cotable data to the backup
* buffer.
*
* In some situations (context swapouts) it might be desirable to make the
* device forget about the cotable without performing a full unbind. A full
* unbind requires reserved backup buffers and it might not be possible to
* reserve them due to locking order violation issues. The vmw_cotable_scrub
* function implements a partial unbind() without that requirement but with the
* following restrictions.
* 1) Before the cotable is again used by the GPU, vmw_cotable_unscrub() must
* be called.
* 2) Before the cotable backing buffer is used by the CPU, or during the
* resource destruction, vmw_cotable_unbind() must be called.
*/
int vmw_cotable_scrub(struct vmw_resource *res, bool readback)
{
struct vmw_cotable *vcotbl = vmw_cotable(res);
struct vmw_private *dev_priv = res->dev_priv;
size_t submit_size;
struct {
SVGA3dCmdHeader header;
SVGA3dCmdDXReadbackCOTable body;
} *cmd0;
struct {
SVGA3dCmdHeader header;
SVGA3dCmdDXSetCOTable body;
} *cmd1;
if (vcotbl->scrubbed)
return 0;
if (co_info[vcotbl->type].unbind_func)
co_info[vcotbl->type].unbind_func(dev_priv,
&vcotbl->resource_list,
readback);
submit_size = sizeof(*cmd1);
if (readback)
submit_size += sizeof(*cmd0);
cmd1 = VMW_CMD_RESERVE(dev_priv, submit_size);
if (!cmd1)
return -ENOMEM;
vcotbl->size_read_back = 0;
if (readback) {
cmd0 = (void *) cmd1;
cmd0->header.id = SVGA_3D_CMD_DX_READBACK_COTABLE;
cmd0->header.size = sizeof(cmd0->body);
cmd0->body.cid = vcotbl->ctx->id;
cmd0->body.type = vcotbl->type;
cmd1 = (void *) &cmd0[1];
vcotbl->size_read_back = res->guest_memory_size;
}
cmd1->header.id = SVGA_3D_CMD_DX_SET_COTABLE;
cmd1->header.size = sizeof(cmd1->body);
cmd1->body.cid = vcotbl->ctx->id;
cmd1->body.type = vcotbl->type;
cmd1->body.mobid = SVGA3D_INVALID_ID;
cmd1->body.validSizeInBytes = 0;
vmw_cmd_commit_flush(dev_priv, submit_size);
vcotbl->scrubbed = true;
/* Trigger a create() on next validate. */
res->id = -1;
return 0;
}
/**
* vmw_cotable_unbind - Cotable resource unbind callback
*
* @res: Pointer to the cotable resource.
* @readback: Whether to read back cotable data to the backup buffer.
* @val_buf: Pointer to a struct ttm_validate_buffer prepared by the caller
* for convenience / fencing.
*
* Unbinds the cotable from the device and fences the backup buffer.
*/
static int vmw_cotable_unbind(struct vmw_resource *res,
bool readback,
struct ttm_validate_buffer *val_buf)
{
struct vmw_cotable *vcotbl = vmw_cotable(res);
struct vmw_private *dev_priv = res->dev_priv;
struct ttm_buffer_object *bo = val_buf->bo;
struct vmw_fence_obj *fence;
if (!vmw_resource_mob_attached(res))
return 0;
WARN_ON_ONCE(bo->resource->mem_type != VMW_PL_MOB);
dma_resv_assert_held(bo->base.resv);
mutex_lock(&dev_priv->binding_mutex);
if (!vcotbl->scrubbed)
vmw_dx_context_scrub_cotables(vcotbl->ctx, readback);
mutex_unlock(&dev_priv->binding_mutex);
(void) vmw_execbuf_fence_commands(NULL, dev_priv, &fence, NULL);
vmw_bo_fence_single(bo, fence);
if (likely(fence != NULL))
vmw_fence_obj_unreference(&fence);
return 0;
}
/**
* vmw_cotable_readback - Read back a cotable without unbinding.
*
* @res: The cotable resource.
*
* Reads back a cotable to its backing mob without scrubbing the MOB from
* the cotable. The MOB is fenced for subsequent CPU access.
*/
static int vmw_cotable_readback(struct vmw_resource *res)
{
struct vmw_cotable *vcotbl = vmw_cotable(res);
struct vmw_private *dev_priv = res->dev_priv;
struct {
SVGA3dCmdHeader header;
SVGA3dCmdDXReadbackCOTable body;
} *cmd;
struct vmw_fence_obj *fence;
if (!vcotbl->scrubbed) {
cmd = VMW_CMD_RESERVE(dev_priv, sizeof(*cmd));
if (!cmd)
return -ENOMEM;
cmd->header.id = SVGA_3D_CMD_DX_READBACK_COTABLE;
cmd->header.size = sizeof(cmd->body);
cmd->body.cid = vcotbl->ctx->id;
cmd->body.type = vcotbl->type;
vcotbl->size_read_back = res->guest_memory_size;
vmw_cmd_commit(dev_priv, sizeof(*cmd));
}
(void) vmw_execbuf_fence_commands(NULL, dev_priv, &fence, NULL);
vmw_bo_fence_single(&res->guest_memory_bo->tbo, fence);
vmw_fence_obj_unreference(&fence);
return 0;
}
/**
* vmw_cotable_resize - Resize a cotable.
*
* @res: The cotable resource.
* @new_size: The new size.
*
* Resizes a cotable and binds the new backup buffer.
* On failure the cotable is left intact.
* Important! This function may not fail once the MOB switch has been
* committed to hardware. That would put the device context in an
* invalid state which we can't currently recover from.
*/
static int vmw_cotable_resize(struct vmw_resource *res, size_t new_size)
{
struct ttm_operation_ctx ctx = { false, false };
struct vmw_private *dev_priv = res->dev_priv;
struct vmw_cotable *vcotbl = vmw_cotable(res);
struct vmw_bo *buf, *old_buf = res->guest_memory_bo;
struct ttm_buffer_object *bo, *old_bo = &res->guest_memory_bo->tbo;
size_t old_size = res->guest_memory_size;
size_t old_size_read_back = vcotbl->size_read_back;
size_t cur_size_read_back;
struct ttm_bo_kmap_obj old_map, new_map;
int ret;
size_t i;
struct vmw_bo_params bo_params = {
.domain = VMW_BO_DOMAIN_MOB,
.busy_domain = VMW_BO_DOMAIN_MOB,
.bo_type = ttm_bo_type_device,
.size = new_size,
.pin = true
};
MKS_STAT_TIME_DECL(MKSSTAT_KERN_COTABLE_RESIZE);
MKS_STAT_TIME_PUSH(MKSSTAT_KERN_COTABLE_RESIZE);
ret = vmw_cotable_readback(res);
if (ret)
goto out_done;
cur_size_read_back = vcotbl->size_read_back;
vcotbl->size_read_back = old_size_read_back;
/*
* While device is processing, Allocate and reserve a buffer object
* for the new COTable. Initially pin the buffer object to make sure
* we can use tryreserve without failure.
*/
ret = vmw_gem_object_create(dev_priv, &bo_params, &buf);
if (ret) {
DRM_ERROR("Failed initializing new cotable MOB.\n");
goto out_done;
}
bo = &buf->tbo;
WARN_ON_ONCE(ttm_bo_reserve(bo, false, true, NULL));
ret = ttm_bo_wait(old_bo, false, false);
if (unlikely(ret != 0)) {
DRM_ERROR("Failed waiting for cotable unbind.\n");
goto out_wait;
}
/*
* Do a page by page copy of COTables. This eliminates slow vmap()s.
* This should really be a TTM utility.
*/
for (i = 0; i < PFN_UP(old_bo->resource->size); ++i) {
bool dummy;
ret = ttm_bo_kmap(old_bo, i, 1, &old_map);
if (unlikely(ret != 0)) {
DRM_ERROR("Failed mapping old COTable on resize.\n");
goto out_wait;
}
ret = ttm_bo_kmap(bo, i, 1, &new_map);
if (unlikely(ret != 0)) {
DRM_ERROR("Failed mapping new COTable on resize.\n");
goto out_map_new;
}
memcpy(ttm_kmap_obj_virtual(&new_map, &dummy),
ttm_kmap_obj_virtual(&old_map, &dummy),
PAGE_SIZE);
ttm_bo_kunmap(&new_map);
ttm_bo_kunmap(&old_map);
}
/* Unpin new buffer, and switch backup buffers. */
vmw_bo_placement_set(buf,
VMW_BO_DOMAIN_MOB,
VMW_BO_DOMAIN_MOB);
ret = ttm_bo_validate(bo, &buf->placement, &ctx);
if (unlikely(ret != 0)) {
DRM_ERROR("Failed validating new COTable backup buffer.\n");
goto out_wait;
}
vmw_resource_mob_detach(res);
res->guest_memory_bo = buf;
res->guest_memory_size = new_size;
vcotbl->size_read_back = cur_size_read_back;
/*
* Now tell the device to switch. If this fails, then we need to
* revert the full resize.
*/
ret = vmw_cotable_unscrub(res);
if (ret) {
DRM_ERROR("Failed switching COTable backup buffer.\n");
res->guest_memory_bo = old_buf;
res->guest_memory_size = old_size;
vcotbl->size_read_back = old_size_read_back;
vmw_resource_mob_attach(res);
goto out_wait;
}
vmw_resource_mob_attach(res);
/* Let go of the old mob. */
vmw_user_bo_unref(&old_buf);
res->id = vcotbl->type;
ret = dma_resv_reserve_fences(bo->base.resv, 1);
if (unlikely(ret))
goto out_wait;
/* Release the pin acquired in vmw_bo_create */
ttm_bo_unpin(bo);
MKS_STAT_TIME_POP(MKSSTAT_KERN_COTABLE_RESIZE);
return 0;
out_map_new:
ttm_bo_kunmap(&old_map);
out_wait:
ttm_bo_unpin(bo);
ttm_bo_unreserve(bo);
vmw_user_bo_unref(&buf);
out_done:
MKS_STAT_TIME_POP(MKSSTAT_KERN_COTABLE_RESIZE);
return ret;
}
/**
* vmw_cotable_create - Cotable resource create callback
*
* @res: Pointer to a cotable resource.
*
* There is no separate create command for cotables, so this callback, which
* is called before bind() in the validation sequence is instead used for two
* things.
* 1) Unscrub the cotable if it is scrubbed and still attached to a backup
* buffer.
* 2) Resize the cotable if needed.
*/
static int vmw_cotable_create(struct vmw_resource *res)
{
struct vmw_cotable *vcotbl = vmw_cotable(res);
size_t new_size = res->guest_memory_size;
size_t needed_size;
int ret;
/* Check whether we need to resize the cotable */
needed_size = (vcotbl->seen_entries + 1) * co_info[vcotbl->type].size;
while (needed_size > new_size)
new_size *= 2;
if (likely(new_size <= res->guest_memory_size)) {
if (vcotbl->scrubbed && vmw_resource_mob_attached(res)) {
ret = vmw_cotable_unscrub(res);
if (ret)
return ret;
}
res->id = vcotbl->type;
return 0;
}
return vmw_cotable_resize(res, new_size);
}
/**
* vmw_hw_cotable_destroy - Cotable hw_destroy callback
*
* @res: Pointer to a cotable resource.
*
* The final (part of resource destruction) destroy callback.
*/
static void vmw_hw_cotable_destroy(struct vmw_resource *res)
{
(void) vmw_cotable_destroy(res);
}
/**
* vmw_cotable_free - Cotable resource destructor
*
* @res: Pointer to a cotable resource.
*/
static void vmw_cotable_free(struct vmw_resource *res)
{
kfree(res);
}
/**
* vmw_cotable_alloc - Create a cotable resource
*
* @dev_priv: Pointer to a device private struct.
* @ctx: Pointer to the context resource.
* The cotable resource will not add a refcount.
* @type: The cotable type.
*/
struct vmw_resource *vmw_cotable_alloc(struct vmw_private *dev_priv,
struct vmw_resource *ctx,
u32 type)
{
struct vmw_cotable *vcotbl;
int ret;
u32 num_entries;
vcotbl = kzalloc(sizeof(*vcotbl), GFP_KERNEL);
if (unlikely(!vcotbl)) {
ret = -ENOMEM;
goto out_no_alloc;
}
ret = vmw_resource_init(dev_priv, &vcotbl->res, true,
vmw_cotable_free, &vmw_cotable_func);
if (unlikely(ret != 0))
goto out_no_init;
INIT_LIST_HEAD(&vcotbl->resource_list);
vcotbl->res.id = type;
vcotbl->res.guest_memory_size = PAGE_SIZE;
num_entries = PAGE_SIZE / co_info[type].size;
if (num_entries < co_info[type].min_initial_entries) {
vcotbl->res.guest_memory_size = co_info[type].min_initial_entries *
co_info[type].size;
vcotbl->res.guest_memory_size = PFN_ALIGN(vcotbl->res.guest_memory_size);
}
vcotbl->scrubbed = true;
vcotbl->seen_entries = -1;
vcotbl->type = type;
vcotbl->ctx = ctx;
vcotbl->res.hw_destroy = vmw_hw_cotable_destroy;
return &vcotbl->res;
out_no_init:
kfree(vcotbl);
out_no_alloc:
return ERR_PTR(ret);
}
/**
* vmw_cotable_notify - Notify the cotable about an item creation
*
* @res: Pointer to a cotable resource.
* @id: Item id.
*/
int vmw_cotable_notify(struct vmw_resource *res, int id)
{
struct vmw_cotable *vcotbl = vmw_cotable(res);
if (id < 0 || id >= SVGA_COTABLE_MAX_IDS) {
DRM_ERROR("Illegal COTable id. Type is %u. Id is %d\n",
(unsigned) vcotbl->type, id);
return -EINVAL;
}
if (vcotbl->seen_entries < id) {
/* Trigger a call to create() on next validate */
res->id = -1;
vcotbl->seen_entries = id;
}
return 0;
}
/**
* vmw_cotable_add_resource - add a view to the cotable's list of active views.
*
* @res: pointer struct vmw_resource representing the cotable.
* @head: pointer to the struct list_head member of the resource, dedicated
* to the cotable active resource list.
*/
void vmw_cotable_add_resource(struct vmw_resource *res, struct list_head *head)
{
struct vmw_cotable *vcotbl =
container_of(res, struct vmw_cotable, res);
list_add_tail(head, &vcotbl->resource_list);
}
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