kernel/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  * Copyright (c) 2008 Silicon Graphics, Inc.  All Rights Reserved.
   7  */
   8
   9 /*
  10  * Cross Partition (XP) uv-based functions.
  11  *
  12  *      Architecture specific implementation of common functions.
  13  *
  14  */
  15
  16 #include <linux/device.h>
  17 #include <asm/uv/uv_hub.h>
  18 #if defined CONFIG_X86_64
  19 #include <asm/uv/bios.h>
  20 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
  21 #include <asm/sn/sn_sal.h>
  22 #endif
  23 #include "../sgi-gru/grukservices.h"
  24 #include "xp.h"
  25
  26 /*
  27  * Convert a virtual memory address to a physical memory address.
  28  */
  29 static unsigned long
  30 xp_pa_uv(void *addr)
  31 {
  32         return uv_gpa(addr);
  33 }
  34
  35 /*
  36  * Convert a global physical to socket physical address.
  37  */
  38 static unsigned long
  39 xp_socket_pa_uv(unsigned long gpa)
  40 {
  41         return uv_gpa_to_soc_phys_ram(gpa);
  42 }
  43
  44 static enum xp_retval
  45 xp_remote_mmr_read(unsigned long dst_gpa, const unsigned long src_gpa,
  46                    size_t len)
  47 {
  48         int ret;
  49         unsigned long *dst_va = __va(uv_gpa_to_soc_phys_ram(dst_gpa));
  50
  51         BUG_ON(!uv_gpa_in_mmr_space(src_gpa));
  52         BUG_ON(len != 8);
  53
  54         ret = gru_read_gpa(dst_va, src_gpa);
  55         if (ret == 0)
  56                 return xpSuccess;
  57
  58         dev_err(xp, "gru_read_gpa() failed, dst_gpa=0x%016lx src_gpa=0x%016lx "
  59                 "len=%ld\n", dst_gpa, src_gpa, len);
  60         return xpGruCopyError;
  61 }
  62
  63
  64 static enum xp_retval
  65 xp_remote_memcpy_uv(unsigned long dst_gpa, const unsigned long src_gpa,
  66                     size_t len)
  67 {
  68         int ret;
  69
  70         if (uv_gpa_in_mmr_space(src_gpa))
  71                 return xp_remote_mmr_read(dst_gpa, src_gpa, len);
  72
  73         ret = gru_copy_gpa(dst_gpa, src_gpa, len);
  74         if (ret == 0)
  75                 return xpSuccess;
  76
  77         dev_err(xp, "gru_copy_gpa() failed, dst_gpa=0x%016lx src_gpa=0x%016lx "
  78                 "len=%ld\n", dst_gpa, src_gpa, len);
  79         return xpGruCopyError;
  80 }
  81
  82 static int
  83 xp_cpu_to_nasid_uv(int cpuid)
  84 {
  85         /* ??? Is this same as sn2 nasid in mach/part bitmaps set up by SAL? */
  86         return UV_PNODE_TO_NASID(uv_cpu_to_pnode(cpuid));
  87 }
  88
  89 static enum xp_retval
  90 xp_expand_memprotect_uv(unsigned long phys_addr, unsigned long size)
  91 {
  92         int ret;
  93
  94 #if defined CONFIG_X86_64
  95         ret = uv_bios_change_memprotect(phys_addr, size, UV_MEMPROT_ALLOW_RW);
  96         if (ret != BIOS_STATUS_SUCCESS) {
  97                 dev_err(xp, "uv_bios_change_memprotect(,, "
  98                         "UV_MEMPROT_ALLOW_RW) failed, ret=%d\n", ret);
  99                 return xpBiosError;
 100         }
 101
 102 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
 103         u64 nasid_array;
 104
 105         ret = sn_change_memprotect(phys_addr, size, SN_MEMPROT_ACCESS_CLASS_1,
 106                                    &nasid_array);
 107         if (ret != 0) {
 108                 dev_err(xp, "sn_change_memprotect(,, "
 109                         "SN_MEMPROT_ACCESS_CLASS_1,) failed ret=%d\n", ret);
 110                 return xpSalError;
 111         }
 112 #else
 113         #error not a supported configuration
 114 #endif
 115         return xpSuccess;
 116 }
 117
 118 static enum xp_retval
 119 xp_restrict_memprotect_uv(unsigned long phys_addr, unsigned long size)
 120 {
 121         int ret;
 122
 123 #if defined CONFIG_X86_64
 124         ret = uv_bios_change_memprotect(phys_addr, size,
 125                                         UV_MEMPROT_RESTRICT_ACCESS);
 126         if (ret != BIOS_STATUS_SUCCESS) {
 127                 dev_err(xp, "uv_bios_change_memprotect(,, "
 128                         "UV_MEMPROT_RESTRICT_ACCESS) failed, ret=%d\n", ret);
 129                 return xpBiosError;
 130         }
 131
 132 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
 133         u64 nasid_array;
 134
 135         ret = sn_change_memprotect(phys_addr, size, SN_MEMPROT_ACCESS_CLASS_0,
 136                                    &nasid_array);
 137         if (ret != 0) {
 138                 dev_err(xp, "sn_change_memprotect(,, "
 139                         "SN_MEMPROT_ACCESS_CLASS_0,) failed ret=%d\n", ret);
 140                 return xpSalError;
 141         }
 142 #else
 143         #error not a supported configuration
 144 #endif
 145         return xpSuccess;
 146 }
 147
 148 enum xp_retval
 149 xp_init_uv(void)
 150 {
 151         BUG_ON(!is_uv());
 152
 153         xp_max_npartitions = XP_MAX_NPARTITIONS_UV;
 154         xp_partition_id = sn_partition_id;
 155         xp_region_size = sn_region_size;
 156
 157         xp_pa = xp_pa_uv;
 158         xp_socket_pa = xp_socket_pa_uv;
 159         xp_remote_memcpy = xp_remote_memcpy_uv;
 160         xp_cpu_to_nasid = xp_cpu_to_nasid_uv;
 161         xp_expand_memprotect = xp_expand_memprotect_uv;
 162         xp_restrict_memprotect = xp_restrict_memprotect_uv;
 163
 164         return xpSuccess;
 165 }
 166
 167 void
 168 xp_exit_uv(void)
 169 {
 170         BUG_ON(!is_uv());
 171 }