gem5  v21.1.0.2
gpu_render_driver.cc
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2021 Kyle Roarty
3  * All Rights Reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions are
7  * met: redistributions of source code must retain the above copyright
8  * notice, this list of conditions and the following disclaimer;
9  * redistributions in binary form must reproduce the above copyright
10  * notice, this list of conditions and the following disclaimer in the
11  * documentation and/or other materials provided with the distribution;
12  * neither the name of the copyright holders nor the names of its
13  * contributors may be used to endorse or promote products derived from
14  * this software without specific prior written permission.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  */
28 
30 
31 #include "params/GPURenderDriver.hh"
32 #include "sim/fd_entry.hh"
33 
34 namespace gem5
35 {
36 
37 GPURenderDriver::GPURenderDriver(const GPURenderDriverParams &p)
38  : EmulatedDriver(p)
39 {
40 }
41 
42 /* ROCm 4 utilizes the render driver located at /dev/dri/renderDXXX. This
43  * patch implements a very simple driver that just returns a file
44  * descriptor when opened.
45  */
46 int
48 {
49  auto process = tc->getProcessPtr();
50  auto device_fd_entry = std::make_shared<DeviceFDEntry>(this, filename);
51  int tgt_fd = process->fds->allocFD(device_fd_entry);
52  return tgt_fd;
53 }
54 
55 /* DGPUs try to mmap the driver file. It doesn't appear they do anything
56  * with it, so we just return the address that's provided
57  */
58 Addr GPURenderDriver::mmap(ThreadContext *tc, Addr start, uint64_t length,
59  int prot, int tgt_flags, int tgt_fd, off_t offset)
60 {
61  warn_once("GPURenderDriver::mmap returning start address %#x", start);
62  return start;
63 }
64 
65 } // namespace gem5
fd_entry.hh
warn_once
#define warn_once(...)
Definition: logging.hh:249
gem5::GPURenderDriver::open
int open(ThreadContext *tc, int mode, int flags) override
Abstract method, invoked when the user program calls open() on the device driver.
Definition: gpu_render_driver.cc:47
gem5::ThreadContext
ThreadContext is the external interface to all thread state for anything outside of the CPU.
Definition: thread_context.hh:93
gem5::MipsISA::p
Bitfield< 0 > p
Definition: pra_constants.hh:326
gem5::ArmISA::offset
Bitfield< 23, 0 > offset
Definition: types.hh:144
gpu_render_driver.hh
gem5::GPURenderDriver::mmap
Addr mmap(ThreadContext *tc, Addr start, uint64_t length, int prot, int tgt_flags, int tgt_fd, off_t offset) override
Virtual method, invoked when the user program calls mmap() on the file descriptor returned by a previ...
Definition: gpu_render_driver.cc:58
gem5::Addr
uint64_t Addr
Address type This will probably be moved somewhere else in the near future.
Definition: types.hh:147
gem5::GPURenderDriver::GPURenderDriver
GPURenderDriver(const GPURenderDriverParams &p)
Definition: gpu_render_driver.cc:37
gem5::ThreadContext::getProcessPtr
virtual Process * getProcessPtr()=0
gem5::EmulatedDriver
EmulatedDriver is an abstract base class for fake SE-mode device drivers.
Definition: emul_driver.hh:55
gem5
Reference material can be found at the JEDEC website: UFS standard http://www.jedec....
Definition: decoder.cc:40
gem5::EmulatedDriver::filename
const std::string & filename
filename for opening this driver (under /dev)
Definition: emul_driver.hh:61
gem5::X86ISA::prot
Bitfield< 7 > prot
Definition: misc.hh:588
gem5::ArmISA::mode
Bitfield< 4, 0 > mode
Definition: misc_types.hh:73

Generated on Tue Sep 21 2021 12:25:23 for gem5 by doxygen 1.8.17