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drm/vmwgfx: Make user resource lookups reference-free during validation

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Make the process of looking up a user resource and adding it to the
validation list reference-free unless when it's actually added to the
validation list where a single reference is taken.
This saves two locked atomic operations per command stream buffer object
handle lookup, unless there is a lookup cache hit.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
This commit is contained in:
Thomas Hellstrom 2018-09-26 16:32:40 +02:00
parent 1b9a01d62c
commit e8c66efbfe
3 changed files with 190 additions and 136 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

18
drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
View file

@ -337,8 +337,6 @@ struct vmw_ctx_validation_info;
* @last_query_ctx: Last context that submitted a query
* @needs_post_query_barrier: Whether a query barrier is needed after
* command submission
* @error_resource: Pointer to hold a reference to the resource causing
* an error
* @staged_bindings: Cached per-context binding tracker
* @staged_bindings_inuse: Whether the cached per-context binding tracker
* is in use
@ -365,7 +363,6 @@ struct vmw_sw_context{
struct vmw_res_cache_entry res_cache[vmw_res_max];
struct vmw_resource *last_query_ctx;
bool needs_post_query_barrier;
struct vmw_resource *error_resource;
struct vmw_ctx_binding_state *staged_bindings;
bool staged_bindings_inuse;
struct list_head staged_cmd_res;
@ -698,6 +695,12 @@ extern int vmw_user_resource_lookup_handle(
uint32_t handle,
const struct vmw_user_resource_conv *converter,
struct vmw_resource **p_res);
extern struct vmw_resource *
vmw_user_resource_noref_lookup_handle(struct vmw_private *dev_priv,
struct ttm_object_file *tfile,
uint32_t handle,
const struct vmw_user_resource_conv *
converter);
extern int vmw_stream_claim_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv);
extern int vmw_stream_unref_ioctl(struct drm_device *dev, void *data,
@ -716,6 +719,15 @@ extern int vmw_query_readback_all(struct vmw_buffer_object *dx_query_mob);
extern void vmw_resource_evict_all(struct vmw_private *dev_priv);
extern void vmw_resource_unbind_list(struct vmw_buffer_object *vbo);
/**
* vmw_user_resource_noref_release - release a user resource pointer looked up
* without reference
*/
static inline void vmw_user_resource_noref_release(void)
{
ttm_base_object_noref_release();
}
/**
* Buffer object helper functions - vmwgfx_bo.c
*/

273
drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
View file

@ -230,16 +230,55 @@ static int vmw_cmd_ctx_first_setup(struct vmw_private *dev_priv,
}
/**
* vmw_resource_val_add - Add a resource to the software context's
* resource list if it's not already on it.
* vmw_execbuf_res_size - calculate extra size fore the resource validation
* node
* @dev_priv: Pointer to the device private struct.
* @res_type: The resource type.
*
* @sw_context: Pointer to the software context.
* @res: Pointer to the resource.
* @p_node On successful return points to a valid pointer to a
* struct vmw_resource_val_node, if non-NULL on entry.
* Guest-backed contexts and DX contexts require extra size to store
* execbuf private information in the validation node. Typically the
* binding manager associated data structures.
*
* Returns: The extra size requirement based on resource type.
*/
static int vmw_resource_val_add(struct vmw_sw_context *sw_context,
struct vmw_resource *res)
static unsigned int vmw_execbuf_res_size(struct vmw_private *dev_priv,
enum vmw_res_type res_type)
{
return (res_type == vmw_res_dx_context ||
(res_type == vmw_res_context && dev_priv->has_mob)) ?
sizeof(struct vmw_ctx_validation_info) : 0;
}
/**
* vmw_execbuf_rcache_update - Update a resource-node cache entry
*
* @rcache: Pointer to the entry to update.
* @res: Pointer to the resource.
* @private: Pointer to the execbuf-private space in the resource
* validation node.
*/
static void vmw_execbuf_rcache_update(struct vmw_res_cache_entry *rcache,
struct vmw_resource *res,
void *private)
{
rcache->res = res;
rcache->private = private;
rcache->valid = 1;
rcache->valid_handle = 0;
}
/**
* vmw_execbuf_res_noref_val_add - Add a resource described by an
* unreferenced rcu-protected pointer to the validation list.
* @sw_context: Pointer to the software context.
* @res: Unreferenced rcu-protected pointer to the resource.
*
* Returns: 0 on success. Negative error code on failure. Typical error
* codes are %-EINVAL on inconsistency and %-ESRCH if the resource was
* doomed.
*/
static int vmw_execbuf_res_noref_val_add(struct vmw_sw_context *sw_context,
struct vmw_resource *res)
{
struct vmw_private *dev_priv = res->dev_priv;
int ret;
@ -247,18 +286,18 @@ static int vmw_resource_val_add(struct vmw_sw_context *sw_context,
struct vmw_res_cache_entry *rcache;
struct vmw_ctx_validation_info *ctx_info;
bool first_usage;
size_t priv_size;
unsigned int priv_size;
/*
* If the resource is a context, set up structures to track
* context bindings.
*/
priv_size = (res_type == vmw_res_dx_context ||
(res_type == vmw_res_context && dev_priv->has_mob)) ?
sizeof(*ctx_info) : 0;
rcache = &sw_context->res_cache[res_type];
if (likely(rcache->valid && rcache->res == res)) {
vmw_user_resource_noref_release();
return 0;
}
priv_size = vmw_execbuf_res_size(dev_priv, res_type);
ret = vmw_validation_add_resource(sw_context->ctx, res, priv_size,
(void **)&ctx_info, &first_usage);
vmw_user_resource_noref_release();
if (ret)
return ret;
@ -269,14 +308,37 @@ static int vmw_resource_val_add(struct vmw_sw_context *sw_context,
return ret;
}
/* Cache info about the last added resource */
rcache = &sw_context->res_cache[res_type];
rcache->res = res;
rcache->private = ctx_info;
rcache->valid = 1;
rcache->valid_handle = 0;
vmw_execbuf_rcache_update(rcache, res, ctx_info);
return 0;
}
return ret;
/**
* vmw_execbuf_res_noctx_val_add - Add a non-context resource to the resource
* validation list if it's not already on it
* @sw_context: Pointer to the software context.
* @res: Pointer to the resource.
*
* Returns: Zero on success. Negative error code on failure.
*/
static int vmw_execbuf_res_noctx_val_add(struct vmw_sw_context *sw_context,
struct vmw_resource *res)
{
struct vmw_res_cache_entry *rcache;
enum vmw_res_type res_type = vmw_res_type(res);
void *ptr;
int ret;
rcache = &sw_context->res_cache[res_type];
if (likely(rcache->valid && rcache->res == res))
return 0;
ret = vmw_validation_add_resource(sw_context->ctx, res, 0, &ptr, NULL);
if (ret)
return ret;
vmw_execbuf_rcache_update(rcache, res, ptr);
return 0;
}
/**
@ -297,11 +359,11 @@ static int vmw_view_res_val_add(struct vmw_sw_context *sw_context,
* First add the resource the view is pointing to, otherwise
* it may be swapped out when the view is validated.
*/
ret = vmw_resource_val_add(sw_context, vmw_view_srf(view));
ret = vmw_execbuf_res_noctx_val_add(sw_context, vmw_view_srf(view));
if (ret)
return ret;
return vmw_resource_val_add(sw_context, view);
return vmw_execbuf_res_noctx_val_add(sw_context, view);
}
/**
@ -371,7 +433,7 @@ static int vmw_resource_context_res_add(struct vmw_private *dev_priv,
if (IS_ERR(res))
continue;
ret = vmw_resource_val_add(sw_context, res);
ret = vmw_execbuf_res_noctx_val_add(sw_context, res);
if (unlikely(ret != 0))
return ret;
}
@ -383,16 +445,11 @@ static int vmw_resource_context_res_add(struct vmw_private *dev_priv,
binding_list = vmw_context_binding_list(ctx);
list_for_each_entry(entry, binding_list, ctx_list) {
/* entry->res is not refcounted */
res = vmw_resource_reference_unless_doomed(entry->res);
if (unlikely(res == NULL))
continue;
if (vmw_res_type(entry->res) == vmw_res_view)
ret = vmw_view_res_val_add(sw_context, entry->res);
else
ret = vmw_resource_val_add(sw_context, entry->res);
vmw_resource_unreference(&res);
ret = vmw_execbuf_res_noctx_val_add(sw_context,
entry->res);
if (unlikely(ret != 0))
break;
}
@ -534,38 +591,6 @@ static int vmw_resources_reserve(struct vmw_sw_context *sw_context)
return ret;
}
/**
* vmw_cmd_res_reloc_add - Add a resource to a software context's
* relocation- and validation lists.
* @dev_priv: Pointer to a struct vmw_private identifying the device.
* @sw_context: Pointer to the software context.
* @id_loc: Pointer to where the id that needs translation is located.
* @res: Valid pointer to a struct vmw_resource.
*
* Return: Zero on success, negative error code on error
*/
static int vmw_cmd_res_reloc_add(struct vmw_private *dev_priv,
struct vmw_sw_context *sw_context,
uint32_t *id_loc,
struct vmw_resource *res)
{
int ret;
ret = vmw_resource_relocation_add(sw_context, res,
vmw_ptr_diff(sw_context->buf_start,
id_loc),
vmw_res_rel_normal);
if (unlikely(ret != 0))
return ret;
ret = vmw_resource_val_add(sw_context, res);
if (unlikely(ret != 0))
return ret;
return 0;
}
/**
* vmw_cmd_res_check - Check that a resource is present and if so, put it
* on the resource validate list unless it's already there.
@ -587,8 +612,7 @@ vmw_cmd_res_check(struct vmw_private *dev_priv,
uint32_t *id_loc,
struct vmw_resource **p_res)
{
struct vmw_res_cache_entry *rcache =
&sw_context->res_cache[res_type];
struct vmw_res_cache_entry *rcache = &sw_context->res_cache[res_type];
struct vmw_resource *res;
int ret;
@ -603,56 +627,41 @@ vmw_cmd_res_check(struct vmw_private *dev_priv,
return 0;
}
/*
* Fastpath in case of repeated commands referencing the same
* resource
*/
if (likely(rcache->valid_handle && *id_loc == rcache->handle)) {
struct vmw_resource *res = rcache->res;
res = rcache->res;
} else {
unsigned int size = vmw_execbuf_res_size(dev_priv, res_type);
if (p_res)
*p_res = res;
ret = vmw_validation_preload_res(sw_context->ctx, size);
if (ret)
return ret;
return vmw_resource_relocation_add
(sw_context, res,
vmw_ptr_diff(sw_context->buf_start, id_loc),
vmw_res_rel_normal);
res = vmw_user_resource_noref_lookup_handle
(dev_priv, sw_context->fp->tfile, *id_loc, converter);
if (unlikely(IS_ERR(res))) {
DRM_ERROR("Could not find or use resource 0x%08x.\n",
(unsigned int) *id_loc);
return PTR_ERR(res);
}
ret = vmw_execbuf_res_noref_val_add(sw_context, res);
if (unlikely(ret != 0))
return ret;
if (rcache->valid && rcache->res == res) {
rcache->valid_handle = true;
rcache->handle = *id_loc;
}
}
ret = vmw_user_resource_lookup_handle(dev_priv,
sw_context->fp->tfile,
*id_loc,
converter,
&res);
if (unlikely(ret != 0)) {
DRM_ERROR("Could not find or use resource 0x%08x.\n",
(unsigned) *id_loc);
dump_stack();
return ret;
}
ret = vmw_cmd_res_reloc_add(dev_priv, sw_context, id_loc,
res);
if (unlikely(ret != 0))
goto out_no_reloc;
ret = vmw_resource_relocation_add(sw_context, res,
vmw_ptr_diff(sw_context->buf_start,
id_loc),
vmw_res_rel_normal);
if (p_res)
*p_res = res;
if (rcache->valid && rcache->res == res) {
rcache->valid_handle = true;
rcache->handle = *id_loc;
}
vmw_resource_unreference(&res);
return 0;
out_no_reloc:
BUG_ON(sw_context->error_resource != NULL);
sw_context->error_resource = res;
return ret;
}
/**
@ -854,9 +863,9 @@ static int vmw_cmd_set_render_target_check(struct vmw_private *dev_priv,
return ret;
ret = vmw_cmd_res_check(dev_priv, sw_context, vmw_res_surface,
user_surface_converter,
&cmd->body.target.sid, &res);
if (unlikely(ret != 0))
user_surface_converter, &cmd->body.target.sid,
&res);
if (unlikely(ret))
return ret;
if (dev_priv->has_mob) {
@ -890,8 +899,8 @@ static int vmw_cmd_surface_copy_check(struct vmw_private *dev_priv,
cmd = container_of(header, struct vmw_sid_cmd, header);
ret = vmw_cmd_res_check(dev_priv, sw_context, vmw_res_surface,
user_surface_converter,
&cmd->body.src.sid, NULL);
user_surface_converter,
&cmd->body.src.sid, NULL);
if (ret)
return ret;
@ -2127,8 +2136,7 @@ static int vmw_cmd_set_shader(struct vmw_private *dev_priv,
cmd->body.type);
if (!IS_ERR(res)) {
ret = vmw_cmd_res_reloc_add(dev_priv, sw_context,
&cmd->body.shid, res);
ret = vmw_execbuf_res_noctx_val_add(sw_context, res);
if (unlikely(ret != 0))
return ret;
}
@ -2345,7 +2353,7 @@ static int vmw_cmd_dx_set_shader(struct vmw_private *dev_priv,
return PTR_ERR(res);
}
ret = vmw_resource_val_add(sw_context, res);
ret = vmw_execbuf_res_noctx_val_add(sw_context, res);
if (ret)
return ret;
}
@ -2883,13 +2891,12 @@ static int vmw_cmd_dx_bind_shader(struct vmw_private *dev_priv,
return PTR_ERR(res);
}
ret = vmw_resource_val_add(sw_context, res);
ret = vmw_execbuf_res_noctx_val_add(sw_context, res);
if (ret) {
DRM_ERROR("Error creating resource validation node.\n");
return ret;
}
return vmw_cmd_res_switch_backup(dev_priv, sw_context, res,
&cmd->body.mobid,
cmd->body.offsetInBytes);
@ -3781,28 +3788,33 @@ static int vmw_execbuf_tie_context(struct vmw_private *dev_priv,
{
struct vmw_resource *res;
int ret;
unsigned int size;
if (handle == SVGA3D_INVALID_ID)
return 0;
ret = vmw_user_resource_lookup_handle(dev_priv, sw_context->fp->tfile,
handle, user_context_converter,
&res);
if (unlikely(ret != 0)) {
size = vmw_execbuf_res_size(dev_priv, vmw_res_dx_context);
ret = vmw_validation_preload_res(sw_context->ctx, size);
if (ret)
return ret;
res = vmw_user_resource_noref_lookup_handle
(dev_priv, sw_context->fp->tfile, handle,
user_context_converter);
if (unlikely(IS_ERR(res))) {
DRM_ERROR("Could not find or user DX context 0x%08x.\n",
(unsigned) handle);
return ret;
return PTR_ERR(res);
}
ret = vmw_resource_val_add(sw_context, res);
ret = vmw_execbuf_res_noref_val_add(sw_context, res);
if (unlikely(ret != 0))
goto out_err;
return ret;
sw_context->dx_ctx_node = vmw_execbuf_info_from_res(sw_context, res);
sw_context->man = vmw_context_res_man(res);
out_err:
vmw_resource_unreference(&res);
return ret;
return 0;
}
int vmw_execbuf_process(struct drm_file *file_priv,
@ -3818,7 +3830,6 @@ int vmw_execbuf_process(struct drm_file *file_priv,
{
struct vmw_sw_context *sw_context = &dev_priv->ctx;
struct vmw_fence_obj *fence = NULL;
struct vmw_resource *error_resource;
struct vmw_cmdbuf_header *header;
uint32_t handle;
int ret;
@ -4028,8 +4039,6 @@ int vmw_execbuf_process(struct drm_file *file_priv,
!dev_priv->query_cid_valid))
__vmw_execbuf_release_pinned_bo(dev_priv, NULL);
out_unlock:
error_resource = sw_context->error_resource;
sw_context->error_resource = NULL;
vmw_cmdbuf_res_revert(&sw_context->staged_cmd_res);
vmw_validation_drop_ht(&val_ctx);
WARN_ON(!list_empty(&sw_context->ctx_list));
@ -4040,8 +4049,6 @@ int vmw_execbuf_process(struct drm_file *file_priv,
* avoid deadlocks in resource destruction paths.
*/
vmw_validation_unref_lists(&val_ctx);
if (unlikely(error_resource != NULL))
vmw_resource_unreference(&error_resource);
out_free_header:
if (header)
vmw_cmdbuf_header_free(header);

35
drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
View file

@ -230,6 +230,41 @@ int vmw_user_resource_lookup_handle(struct vmw_private *dev_priv,
return ret;
}
/**
* 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.
*/
struct vmw_resource *
vmw_user_resource_noref_lookup_handle(struct vmw_private *dev_priv,
struct ttm_object_file *tfile,
uint32_t handle,
const struct vmw_user_resource_conv
*converter)
{
struct ttm_base_object *base;
base = ttm_base_object_noref_lookup(tfile, handle);
if (!base)
return ERR_PTR(-ESRCH);
if (unlikely(ttm_base_object_type(base) != converter->object_type)) {
ttm_base_object_noref_release();
return ERR_PTR(-EINVAL);
}
return converter->base_obj_to_res(base);
}
/**
* Helper function that looks either a surface or bo.
*