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(v: 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(value: dst_va, gpa: 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(gpa: src_gpa))
70 return xp_remote_mmr_read(dst_gpa, src_gpa, len);
71
72 ret = gru_copy_gpa(dest_gpa: dst_gpa, src_gpa, bytes: 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}
152

source code of linux/drivers/misc/sgi-xp/xp_uv.c