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