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/*
* Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include <unistd.h>
#include <stdlib.h>
#include <pthread.h>
#include <nvgpu/bug.h>
#include <nvgpu/types.h>
#include <nvgpu/atomic.h>
#include <nvgpu/nvgpu_common.h>
#include <nvgpu/os_sched.h>
#include <nvgpu/gk20a.h>
#include <nvgpu/posix/probe.h>
#include "os_posix.h"
void nvgpu_wait_for_deferred_interrupts(struct gk20a *g)
{
/*
* No interrupts in userspace so nothing to wait for.
*/
}
int nvgpu_current_pid(struct gk20a *g)
{
/*
* In the kernel this gets us the PID of the calling process for IOCTLs.
* But since we are in userspace this doesn't quite mean the same thing.
* This simply returns the PID of the currently running process.
*/
return (int)getpid();
}
int nvgpu_current_tid(struct gk20a *g)
{
/*
* In POSIX thread ID is not the same as a process ID. In Linux threads
* and processes are represented by the same thing, but userspace can't
* really rely on that.
*
* We can, however, get a pthread_t for a given thread. But this
* pthread_t need not have any relation to the underlying system's
* representation of "threads".
*/
return (int)pthread_self();
}
void __nvgpu_print_current(struct gk20a *g, const char *func_name, int line,
void *ctx, enum nvgpu_log_type type)
{
__nvgpu_log_msg(g, func_name, line, type,
"Current process: (nvgpu userspace)");
}
/*
* Somewhat meaningless in userspace...
*/
void nvgpu_kernel_restart(void *cmd)
{
BUG();
}
/*
* We have no runtime PM stuff in userspace so these are really just noops.
*/
void gk20a_busy_noresume(struct gk20a *g)
{
}
void gk20a_idle_nosuspend(struct gk20a *g)
{
}
int gk20a_busy(struct gk20a *g)
{
nvgpu_atomic_inc(&g->usage_count);
return 0;
}
void gk20a_idle(struct gk20a *g)
{
nvgpu_atomic_dec(&g->usage_count);
}
/*
* This function aims to initialize enough stuff to make unit testing worth
* while. There are several interfaces and APIs that rely on the struct gk20a's
* state in order to function: logging, for example, but there are many other
* things, too.
*
* Initialize as much of that as possible here. This is meant to be equivalent
* to the kernel space driver's probe function.
*/
struct gk20a *nvgpu_posix_probe(void)
{
struct gk20a *g;
struct nvgpu_os_posix *p;
int err;
p = malloc(sizeof(*p));
if (p == NULL)
return NULL;
g = &p->g;
err = nvgpu_kmem_init(g);
if (err != 0)
goto fail;
return g;
fail:
free(p);
return NULL;
}
void nvgpu_posix_cleanup(struct gk20a *g)
{
nvgpu_kmem_fini(g, 0);
}
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