gem5  v22.1.0.0
gpu_render_driver.cc
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1 /*
2  * Copyright (c) 2021 Kyle Roarty
3  * All Rights Reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
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8  * notice, this list of conditions and the following disclaimer;
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12  * neither the name of the copyright holders nor the names of its
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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
EmulatedDriver is an abstract base class for fake SE-mode device drivers.
Definition: emul_driver.hh:56
const std::string & filename
filename for opening this driver (under /dev)
Definition: emul_driver.hh:61
int open(ThreadContext *tc, int mode, int flags) override
Abstract method, invoked when the user program calls open() on the device driver.
GPURenderDriver(const GPURenderDriverParams &p)
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...
ThreadContext is the external interface to all thread state for anything outside of the CPU.
virtual Process * getProcessPtr()=0
uint8_t flags
Definition: helpers.cc:66
#define warn_once(...)
Definition: logging.hh:250
Bitfield< 4, 0 > mode
Definition: misc_types.hh:74
Bitfield< 23, 0 > offset
Definition: types.hh:144
Bitfield< 54 > p
Definition: pagetable.hh:70
Bitfield< 7 > prot
Definition: misc.hh:587
Reference material can be found at the JEDEC website: UFS standard http://www.jedec....
uint64_t Addr
Address type This will probably be moved somewhere else in the near future.
Definition: types.hh:147

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