linux/drivers/ras/amd/atl/dehash.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * AMD Address Translation Library
 *
 * dehash.c : Functions to account for hashing bits
 *
 * Copyright (c) 2023, Advanced Micro Devices, Inc.
 * All Rights Reserved.
 *
 * Author: Yazen Ghannam <[email protected]>
 */

#include "internal.h"

static int df2_dehash_addr(struct addr_ctx *ctx)
{ … }

static int df3_dehash_addr(struct addr_ctx *ctx)
{ … }

static int df3_6chan_dehash_addr(struct addr_ctx *ctx)
{ … }

static int df4_dehash_addr(struct addr_ctx *ctx)
{ … }

static int df4p5_dehash_addr(struct addr_ctx *ctx)
{ … }

/*
 * MI300 hash bits
 *					  4K 64K  2M  1G  1T  1T
 * COH_ST_Select[0]	= XOR of addr{8,  12, 15, 22, 29, 36, 43}
 * COH_ST_Select[1]	= XOR of addr{9,  13, 16, 23, 30, 37, 44}
 * COH_ST_Select[2]	= XOR of addr{10, 14, 17, 24, 31, 38, 45}
 * COH_ST_Select[3]	= XOR of addr{11,     18, 25, 32, 39, 46}
 * COH_ST_Select[4]	= XOR of addr{14,     19, 26, 33, 40, 47} aka Stack
 * DieID[0]		= XOR of addr{12,     20, 27, 34, 41    }
 * DieID[1]		= XOR of addr{13,     21, 28, 35, 42    }
 */
static int mi300_dehash_addr(struct addr_ctx *ctx)
{ … }

int dehash_address(struct addr_ctx *ctx)
{ … }