cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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lima_ctx.c (2074B)

      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}