drivers/misc/sgi-xp/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 #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
  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
  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
  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
  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
  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
  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
 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
 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
 172 xp_exit_uv(void)
 173 {
 174         WARN_ON(!is_uv_system());
 175 }