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construct/include/ircd/simt/mem.h

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// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2022 Jason Volk <jason@zemos.net>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice is present in all copies. The
// full license for this software is available in the LICENSE file.
#pragma once
#define HAVE_IRCD_SIMT_MEM_H
#if defined(__OPENCL_VERSION__)
__constant
struct ircd_simt_mem
{
const uint
local_bank_width, ///< Bytes per bank
local_banks; ///< Banks per unit
const uint
global_bank_width, ///< Bytes per bank
global_chan_banks, ///< Banks per channel
global_chans; ///< Channels per device
}
ircd_simt_mem = //TODO: XXX get values better
{
.local_bank_width = 4,
.local_banks = 32,
.global_bank_width = 256,
#if defined(__AMDDNA__)
.global_chan_banks = 4,
#else
.global_chan_banks = 1,
#endif
#if defined(__AMDDNA__)
.global_chans = 64,
#elif defined(__AMDGCN__)
.global_chans = 12,
#elif defined(__R600__)
.global_chans = 8,
#else
.global_chans = 1,
#endif
};
#endif
#if defined(__OPENCL_VERSION__)
/// Given a global pointer, determines the memory channel and bank within that
/// channel returned as a ushort2: [0] = channel, [1] = bank.
static ushort2
ircd_simt_mem_chan_bank(__global const void *const ptr)
{
const uint
global_chan_width = ircd_simt_mem.global_chan_banks * ircd_simt_mem.global_bank_width,
global_cache_width = ircd_simt_mem.global_chans * global_chan_width;
const uintptr_t
uptr = (uintptr_t)ptr,
cb = uptr % global_cache_width;
const ushort
chan = cb / global_chan_width,
coff = cb % global_chan_width,
bank = coff / ircd_simt_mem.global_bank_width;
return (ushort2)
{
chan, bank
};
}
#endif