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 10 int 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 36 err_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 43 static 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 53 int 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 else 63 ret = -EINVAL; 64 mutex_unlock(&mgr->lock); 65 return ret; 66 } 67 68 struct 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 80 void lima_ctx_put(struct lima_ctx *ctx) 81 { 82 kref_put(&ctx->refcnt, lima_ctx_do_release); 83 } 84 85 void 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 91 void 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