103 lines · c
1// SPDX-License-Identifier: GPL-2.0 OR MIT2/* 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(&ctx->refcnt);20 21 for (i = 0; i < lima_pipe_num; i++) {22 err = lima_sched_context_init(dev->pipe + i, ctx->context + i);23 if (err)24 goto err_out0;25 }26 27 err = xa_alloc(&mgr->handles, id, 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(dev->pipe + i, ctx->context + i);39 kfree(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(ctx->dev->pipe + i, ctx->context + i);50 kfree(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, id);60 if (ctx)61 kref_put(&ctx->refcnt, lima_ctx_do_release);62 else63 ret = -EINVAL;64 mutex_unlock(&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, id);74 if (ctx)75 kref_get(&ctx->refcnt);76 mutex_unlock(&mgr->lock);77 return ctx;78}79 80void lima_ctx_put(struct lima_ctx *ctx)81{82 kref_put(&ctx->refcnt, 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(&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(&ctx->refcnt, lima_ctx_do_release);98 }99 100 xa_destroy(&mgr->handles);101 mutex_destroy(&mgr->lock);102}103