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 #elif defined CONFIG_IA64_SGI_UV
22 #include <asm/sn/sn_sal.h>
23 #endif
24 #include "../sgi-gru/grukservices.h"
25 #include "xp.h"
26 
27 /*
28  * Convert a virtual memory address to a physical memory address.
29  */
30 static unsigned long
xp_pa_uv(void * addr)31 xp_pa_uv(void *addr)
32 {
33 	return uv_gpa(addr);
34 }
35 
36 /*
37  * Convert a global physical to socket physical address.
38  */
39 static unsigned long
xp_socket_pa_uv(unsigned long gpa)40 xp_socket_pa_uv(unsigned long gpa)
41 {
42 	return uv_gpa_to_soc_phys_ram(gpa);
43 }
44 
45 static enum xp_retval
xp_remote_mmr_read(unsigned long dst_gpa,const unsigned long src_gpa,size_t len)46 xp_remote_mmr_read(unsigned long dst_gpa, const unsigned long src_gpa,
47 		   size_t len)
48 {
49 	int ret;
50 	unsigned long *dst_va = __va(uv_gpa_to_soc_phys_ram(dst_gpa));
51 
52 	BUG_ON(!uv_gpa_in_mmr_space(src_gpa));
53 	BUG_ON(len != 8);
54 
55 	ret = gru_read_gpa(dst_va, src_gpa);
56 	if (ret == 0)
57 		return xpSuccess;
58 
59 	dev_err(xp, "gru_read_gpa() failed, dst_gpa=0x%016lx src_gpa=0x%016lx "
60 		"len=%ld\n", dst_gpa, src_gpa, len);
61 	return xpGruCopyError;
62 }
63 
64 
65 static enum xp_retval
xp_remote_memcpy_uv(unsigned long dst_gpa,const unsigned long src_gpa,size_t len)66 xp_remote_memcpy_uv(unsigned long dst_gpa, const unsigned long src_gpa,
67 		    size_t len)
68 {
69 	int ret;
70 
71 	if (uv_gpa_in_mmr_space(src_gpa))
72 		return xp_remote_mmr_read(dst_gpa, src_gpa, len);
73 
74 	ret = gru_copy_gpa(dst_gpa, src_gpa, len);
75 	if (ret == 0)
76 		return xpSuccess;
77 
78 	dev_err(xp, "gru_copy_gpa() failed, dst_gpa=0x%016lx src_gpa=0x%016lx "
79 		"len=%ld\n", dst_gpa, src_gpa, len);
80 	return xpGruCopyError;
81 }
82 
83 static int
xp_cpu_to_nasid_uv(int cpuid)84 xp_cpu_to_nasid_uv(int cpuid)
85 {
86 	/* ??? Is this same as sn2 nasid in mach/part bitmaps set up by SAL? */
87 	return UV_PNODE_TO_NASID(uv_cpu_to_pnode(cpuid));
88 }
89 
90 static enum xp_retval
xp_expand_memprotect_uv(unsigned long phys_addr,unsigned long size)91 xp_expand_memprotect_uv(unsigned long phys_addr, unsigned long size)
92 {
93 	int ret;
94 
95 #if defined CONFIG_X86_64
96 	ret = uv_bios_change_memprotect(phys_addr, size, UV_MEMPROT_ALLOW_RW);
97 	if (ret != BIOS_STATUS_SUCCESS) {
98 		dev_err(xp, "uv_bios_change_memprotect(,, "
99 			"UV_MEMPROT_ALLOW_RW) failed, ret=%d\n", ret);
100 		return xpBiosError;
101 	}
102 
103 #elif defined CONFIG_IA64_SGI_UV
104 	u64 nasid_array;
105 
106 	ret = sn_change_memprotect(phys_addr, size, SN_MEMPROT_ACCESS_CLASS_1,
107 				   &nasid_array);
108 	if (ret != 0) {
109 		dev_err(xp, "sn_change_memprotect(,, "
110 			"SN_MEMPROT_ACCESS_CLASS_1,) failed ret=%d\n", ret);
111 		return xpSalError;
112 	}
113 #else
114 	#error not a supported configuration
115 #endif
116 	return xpSuccess;
117 }
118 
119 static enum xp_retval
xp_restrict_memprotect_uv(unsigned long phys_addr,unsigned long size)120 xp_restrict_memprotect_uv(unsigned long phys_addr, unsigned long size)
121 {
122 	int ret;
123 
124 #if defined CONFIG_X86_64
125 	ret = uv_bios_change_memprotect(phys_addr, size,
126 					UV_MEMPROT_RESTRICT_ACCESS);
127 	if (ret != BIOS_STATUS_SUCCESS) {
128 		dev_err(xp, "uv_bios_change_memprotect(,, "
129 			"UV_MEMPROT_RESTRICT_ACCESS) failed, ret=%d\n", ret);
130 		return xpBiosError;
131 	}
132 
133 #elif defined CONFIG_IA64_SGI_UV
134 	u64 nasid_array;
135 
136 	ret = sn_change_memprotect(phys_addr, size, SN_MEMPROT_ACCESS_CLASS_0,
137 				   &nasid_array);
138 	if (ret != 0) {
139 		dev_err(xp, "sn_change_memprotect(,, "
140 			"SN_MEMPROT_ACCESS_CLASS_0,) failed ret=%d\n", ret);
141 		return xpSalError;
142 	}
143 #else
144 	#error not a supported configuration
145 #endif
146 	return xpSuccess;
147 }
148 
149 enum xp_retval
xp_init_uv(void)150 xp_init_uv(void)
151 {
152 	WARN_ON(!is_uv_system());
153 	if (!is_uv_system())
154 		return xpUnsupported;
155 
156 	xp_max_npartitions = XP_MAX_NPARTITIONS_UV;
157 #ifdef CONFIG_X86
158 	xp_partition_id = sn_partition_id;
159 	xp_region_size = sn_region_size;
160 #endif
161 	xp_pa = xp_pa_uv;
162 	xp_socket_pa = xp_socket_pa_uv;
163 	xp_remote_memcpy = xp_remote_memcpy_uv;
164 	xp_cpu_to_nasid = xp_cpu_to_nasid_uv;
165 	xp_expand_memprotect = xp_expand_memprotect_uv;
166 	xp_restrict_memprotect = xp_restrict_memprotect_uv;
167 
168 	return xpSuccess;
169 }
170 
171 void
xp_exit_uv(void)172 xp_exit_uv(void)
173 {
174 	WARN_ON(!is_uv_system());
175 }
176