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 static enum xp_retval
  36 xp_remote_memcpy_uv(unsigned long dst_gpa, const unsigned long src_gpa,
  37                     size_t len)
  38 {
  39         int ret;
  40
  41         ret = gru_copy_gpa(dst_gpa, src_gpa, len);
  42         if (ret == 0)
  43                 return xpSuccess;
  44
  45         dev_err(xp, "gru_copy_gpa() failed, dst_gpa=0x%016lx src_gpa=0x%016lx "
  46                 "len=%ld\n", dst_gpa, src_gpa, len);
  47         return xpGruCopyError;
  48 }
  49
  50 static int
  51 xp_cpu_to_nasid_uv(int cpuid)
  52 {
  53         /* ??? Is this same as sn2 nasid in mach/part bitmaps set up by SAL? */
  54         return UV_PNODE_TO_NASID(uv_cpu_to_pnode(cpuid));
  55 }
  56
  57 static enum xp_retval
  58 xp_expand_memprotect_uv(unsigned long phys_addr, unsigned long size)
  59 {
  60         int ret;
  61
  62 #if defined CONFIG_X86_64
  63         ret = uv_bios_change_memprotect(phys_addr, size, UV_MEMPROT_ALLOW_RW);
  64         if (ret != BIOS_STATUS_SUCCESS) {
  65                 dev_err(xp, "uv_bios_change_memprotect(,, "
  66                         "UV_MEMPROT_ALLOW_RW) failed, ret=%d\n", ret);
  67                 return xpBiosError;
  68         }
  69
  70 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
  71         u64 nasid_array;
  72
  73         ret = sn_change_memprotect(phys_addr, size, SN_MEMPROT_ACCESS_CLASS_1,
  74                                    &nasid_array);
  75         if (ret != 0) {
  76                 dev_err(xp, "sn_change_memprotect(,, "
  77                         "SN_MEMPROT_ACCESS_CLASS_1,) failed ret=%d\n", ret);
  78                 return xpSalError;
  79         }
  80 #else
  81         #error not a supported configuration
  82 #endif
  83         return xpSuccess;
  84 }
  85
  86 static enum xp_retval
  87 xp_restrict_memprotect_uv(unsigned long phys_addr, unsigned long size)
  88 {
  89         int ret;
  90
  91 #if defined CONFIG_X86_64
  92         ret = uv_bios_change_memprotect(phys_addr, size,
  93                                         UV_MEMPROT_RESTRICT_ACCESS);
  94         if (ret != BIOS_STATUS_SUCCESS) {
  95                 dev_err(xp, "uv_bios_change_memprotect(,, "
  96                         "UV_MEMPROT_RESTRICT_ACCESS) failed, ret=%d\n", ret);
  97                 return xpBiosError;
  98         }
  99
 100 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
 101         u64 nasid_array;
 102
 103         ret = sn_change_memprotect(phys_addr, size, SN_MEMPROT_ACCESS_CLASS_0,
 104                                    &nasid_array);
 105         if (ret != 0) {
 106                 dev_err(xp, "sn_change_memprotect(,, "
 107                         "SN_MEMPROT_ACCESS_CLASS_0,) failed ret=%d\n", ret);
 108                 return xpSalError;
 109         }
 110 #else
 111         #error not a supported configuration
 112 #endif
 113         return xpSuccess;
 114 }
 115
 116 enum xp_retval
 117 xp_init_uv(void)
 118 {
 119         BUG_ON(!is_uv());
 120
 121         xp_max_npartitions = XP_MAX_NPARTITIONS_UV;
 122         xp_partition_id = sn_partition_id;
 123         xp_region_size = sn_region_size;
 124
 125         xp_pa = xp_pa_uv;
 126         xp_remote_memcpy = xp_remote_memcpy_uv;
 127         xp_cpu_to_nasid = xp_cpu_to_nasid_uv;
 128         xp_expand_memprotect = xp_expand_memprotect_uv;
 129         xp_restrict_memprotect = xp_restrict_memprotect_uv;
 130
 131         return xpSuccess;
 132 }
 133
 134 void
 135 xp_exit_uv(void)
 136 {
 137         BUG_ON(!is_uv());
 138 }