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linux-zen-desktop/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c

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// SPDX-License-Identifier: GPL-2.0 OR MIT
/**************************************************************************
*
* Copyright 2009-2023 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.
*
**************************************************************************/
#include <drm/ttm/ttm_placement.h>
#include "vmwgfx_binding.h"
#include "vmwgfx_bo.h"
#include "vmwgfx_drv.h"
#include "vmwgfx_resource_priv.h"
#define VMW_RES_EVICT_ERR_COUNT 10
/**
* vmw_resource_mob_attach - Mark a resource as attached to its backing mob
* @res: The resource
*/
void vmw_resource_mob_attach(struct vmw_resource *res)
{
struct vmw_bo *gbo = res->guest_memory_bo;
struct rb_node **new = &gbo->res_tree.rb_node, *parent = NULL;
dma_resv_assert_held(gbo->tbo.base.resv);
res->used_prio = (res->res_dirty) ? res->func->dirty_prio :
res->func->prio;
while (*new) {
struct vmw_resource *this =
container_of(*new, struct vmw_resource, mob_node);
parent = *new;
new = (res->guest_memory_offset < this->guest_memory_offset) ?
&((*new)->rb_left) : &((*new)->rb_right);
}
rb_link_node(&res->mob_node, parent, new);
rb_insert_color(&res->mob_node, &gbo->res_tree);
vmw_bo_prio_add(gbo, res->used_prio);
}
/**
* vmw_resource_mob_detach - Mark a resource as detached from its backing mob
* @res: The resource
*/
void vmw_resource_mob_detach(struct vmw_resource *res)
{
struct vmw_bo *gbo = res->guest_memory_bo;
dma_resv_assert_held(gbo->tbo.base.resv);
if (vmw_resource_mob_attached(res)) {
rb_erase(&res->mob_node, &gbo->res_tree);
RB_CLEAR_NODE(&res->mob_node);
vmw_bo_prio_del(gbo, res->used_prio);
}
}
struct vmw_resource *vmw_resource_reference(struct vmw_resource *res)
{
kref_get(&res->kref);
return res;
}
struct vmw_resource *
vmw_resource_reference_unless_doomed(struct vmw_resource *res)
{
return kref_get_unless_zero(&res->kref) ? res : NULL;
}
/**
* vmw_resource_release_id - release a resource id to the id manager.
*
* @res: Pointer to the resource.
*
* Release the resource id to the resource id manager and set it to -1
*/
void vmw_resource_release_id(struct vmw_resource *res)
{
struct vmw_private *dev_priv = res->dev_priv;
struct idr *idr = &dev_priv->res_idr[res->func->res_type];
spin_lock(&dev_priv->resource_lock);
if (res->id != -1)
idr_remove(idr, res->id);
res->id = -1;
spin_unlock(&dev_priv->resource_lock);
}
static void vmw_resource_release(struct kref *kref)
{
struct vmw_resource *res =
container_of(kref, struct vmw_resource, kref);
struct vmw_private *dev_priv = res->dev_priv;
int id;
int ret;
struct idr *idr = &dev_priv->res_idr[res->func->res_type];
spin_lock(&dev_priv->resource_lock);
list_del_init(&res->lru_head);
spin_unlock(&dev_priv->resource_lock);
if (res->guest_memory_bo) {
struct ttm_buffer_object *bo = &res->guest_memory_bo->tbo;
ret = ttm_bo_reserve(bo, false, false, NULL);
BUG_ON(ret);
if (vmw_resource_mob_attached(res) &&
res->func->unbind != NULL) {
struct ttm_validate_buffer val_buf;
val_buf.bo = bo;
val_buf.num_shared = 0;
res->func->unbind(res, false, &val_buf);
}
res->guest_memory_size = false;
vmw_resource_mob_detach(res);
if (res->dirty)
res->func->dirty_free(res);
if (res->coherent)
vmw_bo_dirty_release(res->guest_memory_bo);
ttm_bo_unreserve(bo);
vmw_bo_unreference(&res->guest_memory_bo);
}
if (likely(res->hw_destroy != NULL)) {
mutex_lock(&dev_priv->binding_mutex);
vmw_binding_res_list_kill(&res->binding_head);
mutex_unlock(&dev_priv->binding_mutex);
res->hw_destroy(res);
}
id = res->id;
if (res->res_free != NULL)
res->res_free(res);
else
kfree(res);
spin_lock(&dev_priv->resource_lock);
if (id != -1)
idr_remove(idr, id);
spin_unlock(&dev_priv->resource_lock);
}
void vmw_resource_unreference(struct vmw_resource **p_res)
{
struct vmw_resource *res = *p_res;
*p_res = NULL;
kref_put(&res->kref, vmw_resource_release);
}
/**
* vmw_resource_alloc_id - release a resource id to the id manager.
*
* @res: Pointer to the resource.
*
* Allocate the lowest free resource from the resource manager, and set
* @res->id to that id. Returns 0 on success and -ENOMEM on failure.
*/
int vmw_resource_alloc_id(struct vmw_resource *res)
{
struct vmw_private *dev_priv = res->dev_priv;
int ret;
struct idr *idr = &dev_priv->res_idr[res->func->res_type];
BUG_ON(res->id != -1);
idr_preload(GFP_KERNEL);
spin_lock(&dev_priv->resource_lock);
ret = idr_alloc(idr, res, 1, 0, GFP_NOWAIT);
if (ret >= 0)
res->id = ret;
spin_unlock(&dev_priv->resource_lock);
idr_preload_end();
return ret < 0 ? ret : 0;
}
/**
* vmw_resource_init - initialize a struct vmw_resource
*
* @dev_priv: Pointer to a device private struct.
* @res: The struct vmw_resource to initialize.
* @delay_id: Boolean whether to defer device id allocation until
* the first validation.
* @res_free: Resource destructor.
* @func: Resource function table.
*/
int vmw_resource_init(struct vmw_private *dev_priv, struct vmw_resource *res,
bool delay_id,
void (*res_free) (struct vmw_resource *res),
const struct vmw_res_func *func)
{
kref_init(&res->kref);
res->hw_destroy = NULL;
res->res_free = res_free;
res->dev_priv = dev_priv;
res->func = func;
RB_CLEAR_NODE(&res->mob_node);
INIT_LIST_HEAD(&res->lru_head);
INIT_LIST_HEAD(&res->binding_head);
res->id = -1;
res->guest_memory_bo = NULL;
res->guest_memory_offset = 0;
res->guest_memory_dirty = false;
res->res_dirty = false;
res->coherent = false;
res->used_prio = 3;
res->dirty = NULL;
if (delay_id)
return 0;
else
return vmw_resource_alloc_id(res);
}
/**
* vmw_user_resource_lookup_handle - lookup a struct resource from a
* TTM user-space handle and perform basic type checks
*
* @dev_priv: Pointer to a device private struct
* @tfile: Pointer to a struct ttm_object_file identifying the caller
* @handle: The TTM user-space handle
* @converter: Pointer to an object describing the resource type
* @p_res: On successful return the location pointed to will contain
* a pointer to a refcounted struct vmw_resource.
*
* If the handle can't be found or is associated with an incorrect resource
* type, -EINVAL will be returned.
*/
int vmw_user_resource_lookup_handle(struct vmw_private *dev_priv,
struct ttm_object_file *tfile,
uint32_t handle,
const struct vmw_user_resource_conv
*converter,
struct vmw_resource **p_res)
{
struct ttm_base_object *base;
struct vmw_resource *res;
int ret = -EINVAL;
base = ttm_base_object_lookup(tfile, handle);
if (unlikely(!base))
return -EINVAL;
if (unlikely(ttm_base_object_type(base) != converter->object_type))
goto out_bad_resource;
res = converter->base_obj_to_res(base);
kref_get(&res->kref);
*p_res = res;
ret = 0;
out_bad_resource:
ttm_base_object_unref(&base);
return ret;
}
/*
* Helper function that looks either a surface or bo.
*
* The pointer this pointed at by out_surf and out_buf needs to be null.
*/
int vmw_user_lookup_handle(struct vmw_private *dev_priv,
struct drm_file *filp,
uint32_t handle,
struct vmw_surface **out_surf,
struct vmw_bo **out_buf)
{
struct ttm_object_file *tfile = vmw_fpriv(filp)->tfile;
struct vmw_resource *res;
int ret;
BUG_ON(*out_surf || *out_buf);
ret = vmw_user_resource_lookup_handle(dev_priv, tfile, handle,
user_surface_converter,
&res);
if (!ret) {
*out_surf = vmw_res_to_srf(res);
return 0;
}
*out_surf = NULL;
ret = vmw_user_bo_lookup(filp, handle, out_buf);
return ret;
}
/**
* vmw_resource_buf_alloc - Allocate a guest memory buffer for a resource.
*
* @res: The resource for which to allocate a gbo buffer.
* @interruptible: Whether any sleeps during allocation should be
* performed while interruptible.
*/
static int vmw_resource_buf_alloc(struct vmw_resource *res,
bool interruptible)
{
unsigned long size = PFN_ALIGN(res->guest_memory_size);
struct vmw_bo *gbo;
struct vmw_bo_params bo_params = {
.domain = res->func->domain,
.busy_domain = res->func->busy_domain,
.bo_type = ttm_bo_type_device,
.size = res->guest_memory_size,
.pin = false
};
int ret;
if (likely(res->guest_memory_bo)) {
BUG_ON(res->guest_memory_bo->tbo.base.size < size);
return 0;
}
ret = vmw_bo_create(res->dev_priv, &bo_params, &gbo);
if (unlikely(ret != 0))
goto out_no_bo;
res->guest_memory_bo = gbo;
out_no_bo:
return ret;
}
/**
* vmw_resource_do_validate - Make a resource up-to-date and visible
* to the device.
*
* @res: The resource to make visible to the device.
* @val_buf: Information about a buffer possibly
* containing backup data if a bind operation is needed.
* @dirtying: Transfer dirty regions.
*
* On hardware resource shortage, this function returns -EBUSY and
* should be retried once resources have been freed up.
*/
static int vmw_resource_do_validate(struct vmw_resource *res,
struct ttm_validate_buffer *val_buf,
bool dirtying)
{
int ret = 0;
const struct vmw_res_func *func = res->func;
if (unlikely(res->id == -1)) {
ret = func->create(res);
if (unlikely(ret != 0))
return ret;
}
if (func->bind &&
((func->needs_guest_memory && !vmw_resource_mob_attached(res) &&
val_buf->bo) ||
(!func->needs_guest_memory && val_buf->bo))) {
ret = func->bind(res, val_buf);
if (unlikely(ret != 0))
goto out_bind_failed;
if (func->needs_guest_memory)
vmw_resource_mob_attach(res);
}
/*
* Handle the case where the backup mob is marked coherent but
* the resource isn't.
*/
if (func->dirty_alloc && vmw_resource_mob_attached(res) &&
!res->coherent) {
if (res->guest_memory_bo->dirty && !res->dirty) {
ret = func->dirty_alloc(res);
if (ret)
return ret;
} else if (!res->guest_memory_bo->dirty && res->dirty) {
func->dirty_free(res);
}
}
/*
* Transfer the dirty regions to the resource and update
* the resource.
*/
if (res->dirty) {
if (dirtying && !res->res_dirty) {
pgoff_t start = res->guest_memory_offset >> PAGE_SHIFT;
pgoff_t end = __KERNEL_DIV_ROUND_UP
(res->guest_memory_offset + res->guest_memory_size,
PAGE_SIZE);
vmw_bo_dirty_unmap(res->guest_memory_bo, start, end);
}
vmw_bo_dirty_transfer_to_res(res);
return func->dirty_sync(res);
}
return 0;
out_bind_failed:
func->destroy(res);
return ret;
}
/**
* vmw_resource_unreserve - Unreserve a resource previously reserved for
* command submission.
*
* @res: Pointer to the struct vmw_resource to unreserve.
* @dirty_set: Change dirty status of the resource.
* @dirty: When changing dirty status indicates the new status.
* @switch_guest_memory: Guest memory buffer has been switched.
* @new_guest_memory_bo: Pointer to new guest memory buffer if command submission
* switched. May be NULL.
* @new_guest_memory_offset: New gbo offset if @switch_guest_memory is true.
*
* Currently unreserving a resource means putting it back on the device's
* resource lru list, so that it can be evicted if necessary.
*/
void vmw_resource_unreserve(struct vmw_resource *res,
bool dirty_set,
bool dirty,
bool switch_guest_memory,
struct vmw_bo *new_guest_memory_bo,
unsigned long new_guest_memory_offset)
{
struct vmw_private *dev_priv = res->dev_priv;
if (!list_empty(&res->lru_head))
return;
if (switch_guest_memory && new_guest_memory_bo != res->guest_memory_bo) {
if (res->guest_memory_bo) {
vmw_resource_mob_detach(res);
if (res->coherent)
vmw_bo_dirty_release(res->guest_memory_bo);
vmw_bo_unreference(&res->guest_memory_bo);
}
if (new_guest_memory_bo) {
res->guest_memory_bo = vmw_bo_reference(new_guest_memory_bo);
/*
* The validation code should already have added a
* dirty tracker here.
*/
WARN_ON(res->coherent && !new_guest_memory_bo->dirty);
vmw_resource_mob_attach(res);
} else {
res->guest_memory_bo = NULL;
}
} else if (switch_guest_memory && res->coherent) {
vmw_bo_dirty_release(res->guest_memory_bo);
}
if (switch_guest_memory)
res->guest_memory_offset = new_guest_memory_offset;
if (dirty_set)
res->res_dirty = dirty;
if (!res->func->may_evict || res->id == -1 || res->pin_count)
return;
spin_lock(&dev_priv->resource_lock);
list_add_tail(&res->lru_head,
&res->dev_priv->res_lru[res->func->res_type]);
spin_unlock(&dev_priv->resource_lock);
}
/**
* vmw_resource_check_buffer - Check whether a backup buffer is needed
* for a resource and in that case, allocate
* one, reserve and validate it.
*
* @ticket: The ww acquire context to use, or NULL if trylocking.
* @res: The resource for which to allocate a backup buffer.
* @interruptible: Whether any sleeps during allocation should be
* performed while interruptible.
* @val_buf: On successful return contains data about the
* reserved and validated backup buffer.
*/
static int
vmw_resource_check_buffer(struct ww_acquire_ctx *ticket,
struct vmw_resource *res,
bool interruptible,
struct ttm_validate_buffer *val_buf)
{
struct ttm_operation_ctx ctx = { true, false };
struct list_head val_list;
bool guest_memory_dirty = false;
int ret;
if (unlikely(!res->guest_memory_bo)) {
ret = vmw_resource_buf_alloc(res, interruptible);
if (unlikely(ret != 0))
return ret;
}
INIT_LIST_HEAD(&val_list);
ttm_bo_get(&res->guest_memory_bo->tbo);
val_buf->bo = &res->guest_memory_bo->tbo;
val_buf->num_shared = 0;
list_add_tail(&val_buf->head, &val_list);
ret = ttm_eu_reserve_buffers(ticket, &val_list, interruptible, NULL);
if (unlikely(ret != 0))
goto out_no_reserve;
if (res->func->needs_guest_memory && !vmw_resource_mob_attached(res))
return 0;
guest_memory_dirty = res->guest_memory_dirty;
vmw_bo_placement_set(res->guest_memory_bo, res->func->domain,
res->func->busy_domain);
ret = ttm_bo_validate(&res->guest_memory_bo->tbo,
&res->guest_memory_bo->placement,
&ctx);
if (unlikely(ret != 0))
goto out_no_validate;
return 0;
out_no_validate:
ttm_eu_backoff_reservation(ticket, &val_list);
out_no_reserve:
ttm_bo_put(val_buf->bo);
val_buf->bo = NULL;
if (guest_memory_dirty)
vmw_bo_unreference(&res->guest_memory_bo);
return ret;
}
/*
* vmw_resource_reserve - Reserve a resource for command submission
*
* @res: The resource to reserve.
*
* This function takes the resource off the LRU list and make sure
* a guest memory buffer is present for guest-backed resources.
* However, the buffer may not be bound to the resource at this
* point.
*
*/
int vmw_resource_reserve(struct vmw_resource *res, bool interruptible,
bool no_guest_memory)
{
struct vmw_private *dev_priv = res->dev_priv;
int ret;
spin_lock(&dev_priv->resource_lock);
list_del_init(&res->lru_head);
spin_unlock(&dev_priv->resource_lock);
if (res->func->needs_guest_memory && !res->guest_memory_bo &&
!no_guest_memory) {
ret = vmw_resource_buf_alloc(res, interruptible);
if (unlikely(ret != 0)) {
DRM_ERROR("Failed to allocate a guest memory buffer "
"of size %lu. bytes\n",
(unsigned long) res->guest_memory_size);
return ret;
}
}
return 0;
}
/**
* vmw_resource_backoff_reservation - Unreserve and unreference a
* guest memory buffer
*.
* @ticket: The ww acquire ctx used for reservation.
* @val_buf: Guest memory buffer information.
*/
static void
vmw_resource_backoff_reservation(struct ww_acquire_ctx *ticket,
struct ttm_validate_buffer *val_buf)
{
struct list_head val_list;
if (likely(val_buf->bo == NULL))
return;
INIT_LIST_HEAD(&val_list);
list_add_tail(&val_buf->head, &val_list);
ttm_eu_backoff_reservation(ticket, &val_list);
ttm_bo_put(val_buf->bo);
val_buf->bo = NULL;
}
/**
* vmw_resource_do_evict - Evict a resource, and transfer its data
* to a backup buffer.
*
* @ticket: The ww acquire ticket to use, or NULL if trylocking.
* @res: The resource to evict.
* @interruptible: Whether to wait interruptible.
*/
static int vmw_resource_do_evict(struct ww_acquire_ctx *ticket,
struct vmw_resource *res, bool interruptible)
{
struct ttm_validate_buffer val_buf;
const struct vmw_res_func *func = res->func;
int ret;
BUG_ON(!func->may_evict);
val_buf.bo = NULL;
val_buf.num_shared = 0;
ret = vmw_resource_check_buffer(ticket, res, interruptible, &val_buf);
if (unlikely(ret != 0))
return ret;
if (unlikely(func->unbind != NULL &&
(!func->needs_guest_memory || vmw_resource_mob_attached(res)))) {
ret = func->unbind(res, res->res_dirty, &val_buf);
if (unlikely(ret != 0))
goto out_no_unbind;
vmw_resource_mob_detach(res);
}
ret = func->destroy(res);
res->guest_memory_dirty = true;
res->res_dirty = false;
out_no_unbind:
vmw_resource_backoff_reservation(ticket, &val_buf);
return ret;
}
/**
* vmw_resource_validate - Make a resource up-to-date and visible
* to the device.
* @res: The resource to make visible to the device.
* @intr: Perform waits interruptible if possible.
* @dirtying: Pending GPU operation will dirty the resource
*
* On successful return, any backup DMA buffer pointed to by @res->backup will
* be reserved and validated.
* On hardware resource shortage, this function will repeatedly evict
* resources of the same type until the validation succeeds.
*
* Return: Zero on success, -ERESTARTSYS if interrupted, negative error code
* on failure.
*/
int vmw_resource_validate(struct vmw_resource *res, bool intr,
bool dirtying)
{
int ret;
struct vmw_resource *evict_res;
struct vmw_private *dev_priv = res->dev_priv;
struct list_head *lru_list = &dev_priv->res_lru[res->func->res_type];
struct ttm_validate_buffer val_buf;
unsigned err_count = 0;
if (!res->func->create)
return 0;
val_buf.bo = NULL;
val_buf.num_shared = 0;
if (res->guest_memory_bo)
val_buf.bo = &res->guest_memory_bo->tbo;
do {
ret = vmw_resource_do_validate(res, &val_buf, dirtying);
if (likely(ret != -EBUSY))
break;
spin_lock(&dev_priv->resource_lock);
if (list_empty(lru_list) || !res->func->may_evict) {
DRM_ERROR("Out of device device resources "
"for %s.\n", res->func->type_name);
ret = -EBUSY;
spin_unlock(&dev_priv->resource_lock);
break;
}
evict_res = vmw_resource_reference
(list_first_entry(lru_list, struct vmw_resource,
lru_head));
list_del_init(&evict_res->lru_head);
spin_unlock(&dev_priv->resource_lock);
/* Trylock backup buffers with a NULL ticket. */
ret = vmw_resource_do_evict(NULL, evict_res, intr);
if (unlikely(ret != 0)) {
spin_lock(&dev_priv->resource_lock);
list_add_tail(&evict_res->lru_head, lru_list);
spin_unlock(&dev_priv->resource_lock);
if (ret == -ERESTARTSYS ||
++err_count > VMW_RES_EVICT_ERR_COUNT) {
vmw_resource_unreference(&evict_res);
goto out_no_validate;
}
}
vmw_resource_unreference(&evict_res);
} while (1);
if (unlikely(ret != 0))
goto out_no_validate;
else if (!res->func->needs_guest_memory && res->guest_memory_bo) {
WARN_ON_ONCE(vmw_resource_mob_attached(res));
vmw_bo_unreference(&res->guest_memory_bo);
}
return 0;
out_no_validate:
return ret;
}
/**
* vmw_resource_unbind_list
*
* @vbo: Pointer to the current backing MOB.
*
* Evicts the Guest Backed hardware resource if the backup
* buffer is being moved out of MOB memory.
* Note that this function will not race with the resource
* validation code, since resource validation and eviction
* both require the backup buffer to be reserved.
*/
void vmw_resource_unbind_list(struct vmw_bo *vbo)
{
struct ttm_validate_buffer val_buf = {
.bo = &vbo->tbo,
.num_shared = 0
};
dma_resv_assert_held(vbo->tbo.base.resv);
while (!RB_EMPTY_ROOT(&vbo->res_tree)) {
struct rb_node *node = vbo->res_tree.rb_node;
struct vmw_resource *res =
container_of(node, struct vmw_resource, mob_node);
if (!WARN_ON_ONCE(!res->func->unbind))
(void) res->func->unbind(res, res->res_dirty, &val_buf);
res->guest_memory_size = true;
res->res_dirty = false;
vmw_resource_mob_detach(res);
}
(void) ttm_bo_wait(&vbo->tbo, false, false);
}
/**
* vmw_query_readback_all - Read back cached query states
*
* @dx_query_mob: Buffer containing the DX query MOB
*
* Read back cached states from the device if they exist. This function
* assumes binding_mutex is held.
*/
int vmw_query_readback_all(struct vmw_bo *dx_query_mob)
{
struct vmw_resource *dx_query_ctx;
struct vmw_private *dev_priv;
struct {
SVGA3dCmdHeader header;
SVGA3dCmdDXReadbackAllQuery body;
} *cmd;
/* No query bound, so do nothing */
if (!dx_query_mob || !dx_query_mob->dx_query_ctx)
return 0;
dx_query_ctx = dx_query_mob->dx_query_ctx;
dev_priv = dx_query_ctx->dev_priv;
cmd = VMW_CMD_CTX_RESERVE(dev_priv, sizeof(*cmd), dx_query_ctx->id);
if (unlikely(cmd == NULL))
return -ENOMEM;
cmd->header.id = SVGA_3D_CMD_DX_READBACK_ALL_QUERY;
cmd->header.size = sizeof(cmd->body);
cmd->body.cid = dx_query_ctx->id;
vmw_cmd_commit(dev_priv, sizeof(*cmd));
/* Triggers a rebind the next time affected context is bound */
dx_query_mob->dx_query_ctx = NULL;
return 0;
}
/**
* vmw_query_move_notify - Read back cached query states
*
* @bo: The TTM buffer object about to move.
* @old_mem: The memory region @bo is moving from.
* @new_mem: The memory region @bo is moving to.
*
* Called before the query MOB is swapped out to read back cached query
* states from the device.
*/
void vmw_query_move_notify(struct ttm_buffer_object *bo,
struct ttm_resource *old_mem,
struct ttm_resource *new_mem)
{
struct vmw_bo *dx_query_mob;
struct ttm_device *bdev = bo->bdev;
struct vmw_private *dev_priv = vmw_priv_from_ttm(bdev);
mutex_lock(&dev_priv->binding_mutex);
/* If BO is being moved from MOB to system memory */
if (old_mem &&
new_mem->mem_type == TTM_PL_SYSTEM &&
old_mem->mem_type == VMW_PL_MOB) {
struct vmw_fence_obj *fence;
dx_query_mob = to_vmw_bo(&bo->base);
if (!dx_query_mob || !dx_query_mob->dx_query_ctx) {
mutex_unlock(&dev_priv->binding_mutex);
return;
}
(void) vmw_query_readback_all(dx_query_mob);
mutex_unlock(&dev_priv->binding_mutex);
/* Create a fence and attach the BO to it */
(void) vmw_execbuf_fence_commands(NULL, dev_priv, &fence, NULL);
vmw_bo_fence_single(bo, fence);
if (fence != NULL)
vmw_fence_obj_unreference(&fence);
(void) ttm_bo_wait(bo, false, false);
} else
mutex_unlock(&dev_priv->binding_mutex);
}
/**
* vmw_resource_needs_backup - Return whether a resource needs a backup buffer.
*
* @res: The resource being queried.
*/
bool vmw_resource_needs_backup(const struct vmw_resource *res)
{
return res->func->needs_guest_memory;
}
/**
* vmw_resource_evict_type - Evict all resources of a specific type
*
* @dev_priv: Pointer to a device private struct
* @type: The resource type to evict
*
* To avoid thrashing starvation or as part of the hibernation sequence,
* try to evict all evictable resources of a specific type.
*/
static void vmw_resource_evict_type(struct vmw_private *dev_priv,
enum vmw_res_type type)
{
struct list_head *lru_list = &dev_priv->res_lru[type];
struct vmw_resource *evict_res;
unsigned err_count = 0;
int ret;
struct ww_acquire_ctx ticket;
do {
spin_lock(&dev_priv->resource_lock);
if (list_empty(lru_list))
goto out_unlock;
evict_res = vmw_resource_reference(
list_first_entry(lru_list, struct vmw_resource,
lru_head));
list_del_init(&evict_res->lru_head);
spin_unlock(&dev_priv->resource_lock);
/* Wait lock backup buffers with a ticket. */
ret = vmw_resource_do_evict(&ticket, evict_res, false);
if (unlikely(ret != 0)) {
spin_lock(&dev_priv->resource_lock);
list_add_tail(&evict_res->lru_head, lru_list);
spin_unlock(&dev_priv->resource_lock);
if (++err_count > VMW_RES_EVICT_ERR_COUNT) {
vmw_resource_unreference(&evict_res);
return;
}
}
vmw_resource_unreference(&evict_res);
} while (1);
out_unlock:
spin_unlock(&dev_priv->resource_lock);
}
/**
* vmw_resource_evict_all - Evict all evictable resources
*
* @dev_priv: Pointer to a device private struct
*
* To avoid thrashing starvation or as part of the hibernation sequence,
* evict all evictable resources. In particular this means that all
* guest-backed resources that are registered with the device are
* evicted and the OTable becomes clean.
*/
void vmw_resource_evict_all(struct vmw_private *dev_priv)
{
enum vmw_res_type type;
mutex_lock(&dev_priv->cmdbuf_mutex);
for (type = 0; type < vmw_res_max; ++type)
vmw_resource_evict_type(dev_priv, type);
mutex_unlock(&dev_priv->cmdbuf_mutex);
}
/*
* vmw_resource_pin - Add a pin reference on a resource
*
* @res: The resource to add a pin reference on
*
* This function adds a pin reference, and if needed validates the resource.
* Having a pin reference means that the resource can never be evicted, and
* its id will never change as long as there is a pin reference.
* This function returns 0 on success and a negative error code on failure.
*/
int vmw_resource_pin(struct vmw_resource *res, bool interruptible)
{
struct ttm_operation_ctx ctx = { interruptible, false };
struct vmw_private *dev_priv = res->dev_priv;
int ret;
mutex_lock(&dev_priv->cmdbuf_mutex);
ret = vmw_resource_reserve(res, interruptible, false);
if (ret)
goto out_no_reserve;
if (res->pin_count == 0) {
struct vmw_bo *vbo = NULL;
if (res->guest_memory_bo) {
vbo = res->guest_memory_bo;
ret = ttm_bo_reserve(&vbo->tbo, interruptible, false, NULL);
if (ret)
goto out_no_validate;
if (!vbo->tbo.pin_count) {
vmw_bo_placement_set(vbo,
res->func->domain,
res->func->busy_domain);
ret = ttm_bo_validate
(&vbo->tbo,
&vbo->placement,
&ctx);
if (ret) {
ttm_bo_unreserve(&vbo->tbo);
goto out_no_validate;
}
}
/* Do we really need to pin the MOB as well? */
vmw_bo_pin_reserved(vbo, true);
}
ret = vmw_resource_validate(res, interruptible, true);
if (vbo)
ttm_bo_unreserve(&vbo->tbo);
if (ret)
goto out_no_validate;
}
res->pin_count++;
out_no_validate:
vmw_resource_unreserve(res, false, false, false, NULL, 0UL);
out_no_reserve:
mutex_unlock(&dev_priv->cmdbuf_mutex);
return ret;
}
/**
* vmw_resource_unpin - Remove a pin reference from a resource
*
* @res: The resource to remove a pin reference from
*
* Having a pin reference means that the resource can never be evicted, and
* its id will never change as long as there is a pin reference.
*/
void vmw_resource_unpin(struct vmw_resource *res)
{
struct vmw_private *dev_priv = res->dev_priv;
int ret;
mutex_lock(&dev_priv->cmdbuf_mutex);
ret = vmw_resource_reserve(res, false, true);
WARN_ON(ret);
WARN_ON(res->pin_count == 0);
if (--res->pin_count == 0 && res->guest_memory_bo) {
struct vmw_bo *vbo = res->guest_memory_bo;
(void) ttm_bo_reserve(&vbo->tbo, false, false, NULL);
vmw_bo_pin_reserved(vbo, false);
ttm_bo_unreserve(&vbo->tbo);
}
vmw_resource_unreserve(res, false, false, false, NULL, 0UL);
mutex_unlock(&dev_priv->cmdbuf_mutex);
}
/**
* vmw_res_type - Return the resource type
*
* @res: Pointer to the resource
*/
enum vmw_res_type vmw_res_type(const struct vmw_resource *res)
{
return res->func->res_type;
}
/**
* vmw_resource_dirty_update - Update a resource's dirty tracker with a
* sequential range of touched backing store memory.
* @res: The resource.
* @start: The first page touched.
* @end: The last page touched + 1.
*/
void vmw_resource_dirty_update(struct vmw_resource *res, pgoff_t start,
pgoff_t end)
{
if (res->dirty)
res->func->dirty_range_add(res, start << PAGE_SHIFT,
end << PAGE_SHIFT);
}
/**
* vmw_resources_clean - Clean resources intersecting a mob range
* @vbo: The mob buffer object
* @start: The mob page offset starting the range
* @end: The mob page offset ending the range
* @num_prefault: Returns how many pages including the first have been
* cleaned and are ok to prefault
*/
int vmw_resources_clean(struct vmw_bo *vbo, pgoff_t start,
pgoff_t end, pgoff_t *num_prefault)
{
struct rb_node *cur = vbo->res_tree.rb_node;
struct vmw_resource *found = NULL;
unsigned long res_start = start << PAGE_SHIFT;
unsigned long res_end = end << PAGE_SHIFT;
unsigned long last_cleaned = 0;
/*
* Find the resource with lowest backup_offset that intersects the
* range.
*/
while (cur) {
struct vmw_resource *cur_res =
container_of(cur, struct vmw_resource, mob_node);
if (cur_res->guest_memory_offset >= res_end) {
cur = cur->rb_left;
} else if (cur_res->guest_memory_offset + cur_res->guest_memory_size <=
res_start) {
cur = cur->rb_right;
} else {
found = cur_res;
cur = cur->rb_left;
/* Continue to look for resources with lower offsets */
}
}
/*
* In order of increasing guest_memory_offset, clean dirty resources
* intersecting the range.
*/
while (found) {
if (found->res_dirty) {
int ret;
if (!found->func->clean)
return -EINVAL;
ret = found->func->clean(found);
if (ret)
return ret;
found->res_dirty = false;
}
last_cleaned = found->guest_memory_offset + found->guest_memory_size;
cur = rb_next(&found->mob_node);
if (!cur)
break;
found = container_of(cur, struct vmw_resource, mob_node);
if (found->guest_memory_offset >= res_end)
break;
}
/*
* Set number of pages allowed prefaulting and fence the buffer object
*/
*num_prefault = 1;
if (last_cleaned > res_start) {
struct ttm_buffer_object *bo = &vbo->tbo;
*num_prefault = __KERNEL_DIV_ROUND_UP(last_cleaned - res_start,
PAGE_SIZE);
vmw_bo_fence_single(bo, NULL);
}
return 0;
}
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