drivers/gpu/drm/lima/lima_ctx.c

   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
   9 int 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
  32 err_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
  39 static 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
  49 int 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
  64 struct 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
  76 void lima_ctx_put(struct lima_ctx *ctx)
  77 {
  78         kref_put(&ctx->refcnt, lima_ctx_do_release);
  79 }
  80
  81 void 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
  87 void 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 }