xp_uv.c

  1/*
  2 * This file is subject to the terms and conditions of the GNU General Public
  3 * License.  See the file "COPYING" in the main directory of this archive
  4 * for more details.
  5 *
  6 * (C) Copyright 2020 Hewlett Packard Enterprise Development LP
  7 * Copyright (c) 2008 Silicon Graphics, Inc.  All Rights Reserved.
  8 */
  9
 10/*
 11 * Cross Partition (XP) uv-based functions.
 12 *
 13 *      Architecture specific implementation of common functions.
 14 *
 15 */
 16
 17#include <linux/device.h>
 18#include <asm/uv/uv_hub.h>
 19#if defined CONFIG_X86_64
 20#include <asm/uv/bios.h>
 21#endif
 22#include "../sgi-gru/grukservices.h"
 23#include "xp.h"
 24
 25/*
 26 * Convert a virtual memory address to a physical memory address.
 27 */
 28static unsigned long
 29xp_pa_uv(void *addr)
 30{
 31	return uv_gpa(addr);
 32}
 33
 34/*
 35 * Convert a global physical to socket physical address.
 36 */
 37static unsigned long
 38xp_socket_pa_uv(unsigned long gpa)
 39{
 40	return uv_gpa_to_soc_phys_ram(gpa);
 41}
 42
 43static enum xp_retval
 44xp_remote_mmr_read(unsigned long dst_gpa, const unsigned long src_gpa,
 45		   size_t len)
 46{
 47	int ret;
 48	unsigned long *dst_va = __va(uv_gpa_to_soc_phys_ram(dst_gpa));
 49
 50	BUG_ON(!uv_gpa_in_mmr_space(src_gpa));
 51	BUG_ON(len != 8);
 52
 53	ret = gru_read_gpa(dst_va, src_gpa);
 54	if (ret == 0)
 55		return xpSuccess;
 56
 57	dev_err(xp, "gru_read_gpa() failed, dst_gpa=0x%016lx src_gpa=0x%016lx "
 58		"len=%ld\n", dst_gpa, src_gpa, len);
 59	return xpGruCopyError;
 60}
 61
 62
 63static enum xp_retval
 64xp_remote_memcpy_uv(unsigned long dst_gpa, const unsigned long src_gpa,
 65		    size_t len)
 66{
 67	int ret;
 68
 69	if (uv_gpa_in_mmr_space(src_gpa))
 70		return xp_remote_mmr_read(dst_gpa, src_gpa, len);
 71
 72	ret = gru_copy_gpa(dst_gpa, src_gpa, len);
 73	if (ret == 0)
 74		return xpSuccess;
 75
 76	dev_err(xp, "gru_copy_gpa() failed, dst_gpa=0x%016lx src_gpa=0x%016lx "
 77		"len=%ld\n", dst_gpa, src_gpa, len);
 78	return xpGruCopyError;
 79}
 80
 81static int
 82xp_cpu_to_nasid_uv(int cpuid)
 83{
 84	/* ??? Is this same as sn2 nasid in mach/part bitmaps set up by SAL? */
 85	return UV_PNODE_TO_NASID(uv_cpu_to_pnode(cpuid));
 86}
 87
 88static enum xp_retval
 89xp_expand_memprotect_uv(unsigned long phys_addr, unsigned long size)
 90{
 91	int ret;
 92
 93#if defined CONFIG_X86_64
 94	ret = uv_bios_change_memprotect(phys_addr, size, UV_MEMPROT_ALLOW_RW);
 95	if (ret != BIOS_STATUS_SUCCESS) {
 96		dev_err(xp, "uv_bios_change_memprotect(,, "
 97			"UV_MEMPROT_ALLOW_RW) failed, ret=%d\n", ret);
 98		return xpBiosError;
 99	}
100#else
101	#error not a supported configuration
102#endif
103	return xpSuccess;
104}
105
106static enum xp_retval
107xp_restrict_memprotect_uv(unsigned long phys_addr, unsigned long size)
108{
109	int ret;
110
111#if defined CONFIG_X86_64
112	ret = uv_bios_change_memprotect(phys_addr, size,
113					UV_MEMPROT_RESTRICT_ACCESS);
114	if (ret != BIOS_STATUS_SUCCESS) {
115		dev_err(xp, "uv_bios_change_memprotect(,, "
116			"UV_MEMPROT_RESTRICT_ACCESS) failed, ret=%d\n", ret);
117		return xpBiosError;
118	}
119#else
120	#error not a supported configuration
121#endif
122	return xpSuccess;
123}
124
125enum xp_retval
126xp_init_uv(void)
127{
128	WARN_ON(!is_uv_system());
129	if (!is_uv_system())
130		return xpUnsupported;
131
132	xp_max_npartitions = XP_MAX_NPARTITIONS_UV;
133#ifdef CONFIG_X86
134	xp_partition_id = sn_partition_id;
135	xp_region_size = sn_region_size;
136#endif
137	xp_pa = xp_pa_uv;
138	xp_socket_pa = xp_socket_pa_uv;
139	xp_remote_memcpy = xp_remote_memcpy_uv;
140	xp_cpu_to_nasid = xp_cpu_to_nasid_uv;
141	xp_expand_memprotect = xp_expand_memprotect_uv;
142	xp_restrict_memprotect = xp_restrict_memprotect_uv;
143
144	return xpSuccess;
145}
146
147void
148xp_exit_uv(void)
149{
150	WARN_ON(!is_uv_system());
151}