1// SPDX-License-Identifier: GPL-2.0 OR MIT
2/* Copyright 2018-2019 Qiang Yu <yuq825@gmail.com> */
3
4#include <linux/pid.h>
5#include <linux/slab.h>
6
7#include "lima_device.h"
8#include "lima_ctx.h"
9
10int lima_ctx_create(struct lima_device *dev, struct lima_ctx_mgr *mgr, u32 *id)
11{
12 struct lima_ctx *ctx;
13 int i, err;
14
15 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
16 if (!ctx)
17 return -ENOMEM;
18 ctx->dev = dev;
19 kref_init(kref: &ctx->refcnt);
20
21 for (i = 0; i < lima_pipe_num; i++) {
22 err = lima_sched_context_init(pipe: dev->pipe + i, context: ctx->context + i);
23 if (err)
24 goto err_out0;
25 }
26
27 err = xa_alloc(xa: &mgr->handles, id, entry: ctx, xa_limit_32b, GFP_KERNEL);
28 if (err < 0)
29 goto err_out0;
30
31 ctx->pid = task_pid_nr(current);
32 get_task_comm(ctx->pname, current);
33
34 return 0;
35
36err_out0:
37 for (i--; i >= 0; i--)
38 lima_sched_context_fini(pipe: dev->pipe + i, context: ctx->context + i);
39 kfree(objp: ctx);
40 return err;
41}
42
43static void lima_ctx_do_release(struct kref *ref)
44{
45 struct lima_ctx *ctx = container_of(ref, struct lima_ctx, refcnt);
46 int i;
47
48 for (i = 0; i < lima_pipe_num; i++)
49 lima_sched_context_fini(pipe: ctx->dev->pipe + i, context: ctx->context + i);
50 kfree(objp: ctx);
51}
52
53int lima_ctx_free(struct lima_ctx_mgr *mgr, u32 id)
54{
55 struct lima_ctx *ctx;
56 int ret = 0;
57
58 mutex_lock(&mgr->lock);
59 ctx = xa_erase(&mgr->handles, index: id);
60 if (ctx)
61 kref_put(kref: &ctx->refcnt, release: lima_ctx_do_release);
62 else
63 ret = -EINVAL;
64 mutex_unlock(lock: &mgr->lock);
65 return ret;
66}
67
68struct lima_ctx *lima_ctx_get(struct lima_ctx_mgr *mgr, u32 id)
69{
70 struct lima_ctx *ctx;
71
72 mutex_lock(&mgr->lock);
73 ctx = xa_load(&mgr->handles, index: id);
74 if (ctx)
75 kref_get(kref: &ctx->refcnt);
76 mutex_unlock(lock: &mgr->lock);
77 return ctx;
78}
79
80void lima_ctx_put(struct lima_ctx *ctx)
81{
82 kref_put(kref: &ctx->refcnt, release: lima_ctx_do_release);
83}
84
85void lima_ctx_mgr_init(struct lima_ctx_mgr *mgr)
86{
87 mutex_init(&mgr->lock);
88 xa_init_flags(xa: &mgr->handles, XA_FLAGS_ALLOC);
89}
90
91void lima_ctx_mgr_fini(struct lima_ctx_mgr *mgr)
92{
93 struct lima_ctx *ctx;
94 unsigned long id;
95
96 xa_for_each(&mgr->handles, id, ctx) {
97 kref_put(kref: &ctx->refcnt, release: lima_ctx_do_release);
98 }
99
100 xa_destroy(&mgr->handles);
101 mutex_destroy(lock: &mgr->lock);
102}
103

source code of linux/drivers/gpu/drm/lima/lima_ctx.c