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	ctx->pid = task_pid_nr(current);
 31	get_task_comm(ctx->pname, current);
 32
 33	return 0;
 34
 35err_out0:
 36	for (i--; i >= 0; i--)
 37		lima_sched_context_fini(dev->pipe + i, ctx->context + i);
 38	kfree(ctx);
 39	return err;
 40}
 41
 42static void lima_ctx_do_release(struct kref *ref)
 43{
 44	struct lima_ctx *ctx = container_of(ref, struct lima_ctx, refcnt);
 45	int i;
 46
 47	for (i = 0; i < lima_pipe_num; i++)
 48		lima_sched_context_fini(ctx->dev->pipe + i, ctx->context + i);
 49	kfree(ctx);
 50}
 51
 52int lima_ctx_free(struct lima_ctx_mgr *mgr, u32 id)
 53{
 54	struct lima_ctx *ctx;
 55	int ret = 0;
 56
 57	mutex_lock(&mgr->lock);
 58	ctx = xa_erase(&mgr->handles, id);
 59	if (ctx)
 60		kref_put(&ctx->refcnt, lima_ctx_do_release);
 61	else
 62		ret = -EINVAL;
 63	mutex_unlock(&mgr->lock);
 64	return ret;
 65}
 66
 67struct lima_ctx *lima_ctx_get(struct lima_ctx_mgr *mgr, u32 id)
 68{
 69	struct lima_ctx *ctx;
 70
 71	mutex_lock(&mgr->lock);
 72	ctx = xa_load(&mgr->handles, id);
 73	if (ctx)
 74		kref_get(&ctx->refcnt);
 75	mutex_unlock(&mgr->lock);
 76	return ctx;
 77}
 78
 79void lima_ctx_put(struct lima_ctx *ctx)
 80{
 81	kref_put(&ctx->refcnt, lima_ctx_do_release);
 82}
 83
 84void lima_ctx_mgr_init(struct lima_ctx_mgr *mgr)
 85{
 86	mutex_init(&mgr->lock);
 87	xa_init_flags(&mgr->handles, XA_FLAGS_ALLOC);
 88}
 89
 90void lima_ctx_mgr_fini(struct lima_ctx_mgr *mgr)
 91{
 92	struct lima_ctx *ctx;
 93	unsigned long id;
 94
 95	xa_for_each(&mgr->handles, id, ctx) {
 96		kref_put(&ctx->refcnt, lima_ctx_do_release);
 97	}
 98
 99	xa_destroy(&mgr->handles);
100	mutex_destroy(&mgr->lock);
101}