112 lines
4.0 KiB
C
112 lines
4.0 KiB
C
/* SPDX-License-Identifier: MIT */
|
|
/*
|
|
* Copyright © 2021 Intel Corporation
|
|
*/
|
|
|
|
#ifndef __I915_FILE_PRIVATE_H__
|
|
#define __I915_FILE_PRIVATE_H__
|
|
|
|
#include <linux/mutex.h>
|
|
#include <linux/types.h>
|
|
#include <linux/xarray.h>
|
|
|
|
struct drm_i915_private;
|
|
struct drm_file;
|
|
struct i915_drm_client;
|
|
|
|
struct drm_i915_file_private {
|
|
struct drm_i915_private *dev_priv;
|
|
|
|
union {
|
|
struct drm_file *file;
|
|
struct rcu_head rcu;
|
|
};
|
|
|
|
/** @proto_context_lock: Guards all struct i915_gem_proto_context
|
|
* operations
|
|
*
|
|
* This not only guards @proto_context_xa, but is always held
|
|
* whenever we manipulate any struct i915_gem_proto_context,
|
|
* including finalizing it on first actual use of the GEM context.
|
|
*
|
|
* See i915_gem_proto_context.
|
|
*/
|
|
struct mutex proto_context_lock;
|
|
|
|
/** @proto_context_xa: xarray of struct i915_gem_proto_context
|
|
*
|
|
* Historically, the context uAPI allowed for two methods of
|
|
* setting context parameters: SET_CONTEXT_PARAM and
|
|
* CONTEXT_CREATE_EXT_SETPARAM. The former is allowed to be called
|
|
* at any time while the later happens as part of
|
|
* GEM_CONTEXT_CREATE. Everything settable via one was settable
|
|
* via the other. While some params are fairly simple and setting
|
|
* them on a live context is harmless such as the context priority,
|
|
* others are far trickier such as the VM or the set of engines.
|
|
* In order to swap out the VM, for instance, we have to delay
|
|
* until all current in-flight work is complete, swap in the new
|
|
* VM, and then continue. This leads to a plethora of potential
|
|
* race conditions we'd really rather avoid.
|
|
*
|
|
* We have since disallowed setting these more complex parameters
|
|
* on active contexts. This works by delaying the creation of the
|
|
* actual context until after the client is done configuring it
|
|
* with SET_CONTEXT_PARAM. From the perspective of the client, it
|
|
* has the same u32 context ID the whole time. From the
|
|
* perspective of i915, however, it's a struct i915_gem_proto_context
|
|
* right up until the point where we attempt to do something which
|
|
* the proto-context can't handle. Then the struct i915_gem_context
|
|
* gets created.
|
|
*
|
|
* This is accomplished via a little xarray dance. When
|
|
* GEM_CONTEXT_CREATE is called, we create a struct
|
|
* i915_gem_proto_context, reserve a slot in @context_xa but leave
|
|
* it NULL, and place the proto-context in the corresponding slot
|
|
* in @proto_context_xa. Then, in i915_gem_context_lookup(), we
|
|
* first check @context_xa. If it's there, we return the struct
|
|
* i915_gem_context and we're done. If it's not, we look in
|
|
* @proto_context_xa and, if we find it there, we create the actual
|
|
* context and kill the proto-context.
|
|
*
|
|
* In order for this dance to work properly, everything which ever
|
|
* touches a struct i915_gem_proto_context is guarded by
|
|
* @proto_context_lock, including context creation. Yes, this
|
|
* means context creation now takes a giant global lock but it
|
|
* can't really be helped and that should never be on any driver's
|
|
* fast-path anyway.
|
|
*/
|
|
struct xarray proto_context_xa;
|
|
|
|
/** @context_xa: xarray of fully created i915_gem_context
|
|
*
|
|
* Write access to this xarray is guarded by @proto_context_lock.
|
|
* Otherwise, writers may race with finalize_create_context_locked().
|
|
*
|
|
* See @proto_context_xa.
|
|
*/
|
|
struct xarray context_xa;
|
|
struct xarray vm_xa;
|
|
|
|
unsigned int bsd_engine;
|
|
|
|
/*
|
|
* Every context ban increments per client ban score. Also
|
|
* hangs in short succession increments ban score. If ban threshold
|
|
* is reached, client is considered banned and submitting more work
|
|
* will fail. This is a stop gap measure to limit the badly behaving
|
|
* clients access to gpu. Note that unbannable contexts never increment
|
|
* the client ban score.
|
|
*/
|
|
#define I915_CLIENT_SCORE_HANG_FAST 1
|
|
#define I915_CLIENT_FAST_HANG_JIFFIES (60 * HZ)
|
|
#define I915_CLIENT_SCORE_CONTEXT_BAN 3
|
|
#define I915_CLIENT_SCORE_BANNED 9
|
|
/** ban_score: Accumulated score of all ctx bans and fast hangs. */
|
|
atomic_t ban_score;
|
|
unsigned long hang_timestamp;
|
|
|
|
struct i915_drm_client *client;
|
|
};
|
|
|
|
#endif /* __I915_FILE_PRIVATE_H__ */
|