/*
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* SPDX-License-Identifier: MIT
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*
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* Copyright © 2019 Intel Corporation
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*/
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#ifndef __I915_GEM_CONTEXT_TYPES_H__
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#define __I915_GEM_CONTEXT_TYPES_H__
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#include <linux/atomic.h>
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#include <linux/list.h>
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#include <linux/llist.h>
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#include <linux/kref.h>
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#include <linux/mutex.h>
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#include <linux/radix-tree.h>
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#include <linux/rbtree.h>
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#include <linux/rcupdate.h>
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#include <linux/types.h>
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#include "gt/intel_context_types.h"
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#include "i915_scheduler.h"
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#include "i915_sw_fence.h"
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struct pid;
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struct drm_i915_private;
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struct drm_i915_file_private;
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struct i915_address_space;
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struct intel_timeline;
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struct intel_ring;
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struct i915_gem_engines {
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union {
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struct list_head link;
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struct rcu_head rcu;
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};
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struct i915_sw_fence fence;
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struct i915_gem_context *ctx;
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unsigned int num_engines;
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struct intel_context *engines[];
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};
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struct i915_gem_engines_iter {
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unsigned int idx;
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const struct i915_gem_engines *engines;
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};
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/**
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* struct i915_gem_context - client state
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*
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* The struct i915_gem_context represents the combined view of the driver and
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* logical hardware state for a particular client.
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*/
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struct i915_gem_context {
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/** i915: i915 device backpointer */
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struct drm_i915_private *i915;
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/** file_priv: owning file descriptor */
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struct drm_i915_file_private *file_priv;
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/**
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* @engines: User defined engines for this context
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*
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* Various uAPI offer the ability to lookup up an
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* index from this array to select an engine operate on.
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*
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* Multiple logically distinct instances of the same engine
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* may be defined in the array, as well as composite virtual
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* engines.
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*
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* Execbuf uses the I915_EXEC_RING_MASK as an index into this
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* array to select which HW context + engine to execute on. For
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* the default array, the user_ring_map[] is used to translate
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* the legacy uABI onto the approprate index (e.g. both
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* I915_EXEC_DEFAULT and I915_EXEC_RENDER select the same
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* context, and I915_EXEC_BSD is weird). For a use defined
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* array, execbuf uses I915_EXEC_RING_MASK as a plain index.
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*
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* User defined by I915_CONTEXT_PARAM_ENGINE (when the
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* CONTEXT_USER_ENGINES flag is set).
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*/
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struct i915_gem_engines __rcu *engines;
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struct mutex engines_mutex; /* guards writes to engines */
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struct intel_timeline *timeline;
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/**
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* @vm: unique address space (GTT)
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*
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* In full-ppgtt mode, each context has its own address space ensuring
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* complete seperation of one client from all others.
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*
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* In other modes, this is a NULL pointer with the expectation that
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* the caller uses the shared global GTT.
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*/
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struct i915_address_space __rcu *vm;
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/**
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* @pid: process id of creator
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*
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* Note that who created the context may not be the principle user,
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* as the context may be shared across a local socket. However,
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* that should only affect the default context, all contexts created
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* explicitly by the client are expected to be isolated.
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*/
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struct pid *pid;
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/** link: place with &drm_i915_private.context_list */
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struct list_head link;
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struct llist_node free_link;
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/**
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* @ref: reference count
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*
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* A reference to a context is held by both the client who created it
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* and on each request submitted to the hardware using the request
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* (to ensure the hardware has access to the state until it has
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* finished all pending writes). See i915_gem_context_get() and
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* i915_gem_context_put() for access.
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*/
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struct kref ref;
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/**
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* @rcu: rcu_head for deferred freeing.
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*/
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struct rcu_head rcu;
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/**
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* @user_flags: small set of booleans controlled by the user
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*/
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unsigned long user_flags;
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#define UCONTEXT_NO_ZEROMAP 0
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#define UCONTEXT_NO_ERROR_CAPTURE 1
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#define UCONTEXT_BANNABLE 2
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#define UCONTEXT_RECOVERABLE 3
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#define UCONTEXT_PERSISTENCE 4
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/**
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* @flags: small set of booleans
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*/
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unsigned long flags;
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#define CONTEXT_CLOSED 0
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#define CONTEXT_USER_ENGINES 1
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struct mutex mutex;
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struct i915_sched_attr sched;
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/** guilty_count: How many times this context has caused a GPU hang. */
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atomic_t guilty_count;
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/**
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* @active_count: How many times this context was active during a GPU
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* hang, but did not cause it.
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*/
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atomic_t active_count;
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/**
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* @hang_timestamp: The last time(s) this context caused a GPU hang
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*/
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unsigned long hang_timestamp[2];
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#define CONTEXT_FAST_HANG_JIFFIES (120 * HZ) /* 3 hangs within 120s? Banned! */
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/** remap_slice: Bitmask of cache lines that need remapping */
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u8 remap_slice;
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/**
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* handles_vma: rbtree to look up our context specific obj/vma for
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* the user handle. (user handles are per fd, but the binding is
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* per vm, which may be one per context or shared with the global GTT)
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*/
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struct radix_tree_root handles_vma;
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struct mutex lut_mutex;
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/**
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* @name: arbitrary name, used for user debug
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*
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* A name is constructed for the context from the creator's process
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* name, pid and user handle in order to uniquely identify the
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* context in messages.
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*/
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char name[TASK_COMM_LEN + 8];
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struct {
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spinlock_t lock;
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struct list_head engines;
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} stale;
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};
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#endif /* __I915_GEM_CONTEXT_TYPES_H__ */
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