LXR linux/drivers/misc/sgi-xp/xp

   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_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 */
  29static unsigned long
  30xp_pa_uv(void *addr)
  31{
  32        return uv_gpa(addr);
  33}
  34
  35/*
  36 * Convert a global physical to socket physical address.
  37 */
  38static unsigned long
  39xp_socket_pa_uv(unsigned long gpa)
  40{
  41        return uv_gpa_to_soc_phys_ram(gpa);
  42}
  43
  44static enum xp_retval
  45xp_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
  64static enum xp_retval
  65xp_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
  82static int
  83xp_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
  89static enum xp_retval
  90xp_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_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
 118static enum xp_retval
 119xp_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_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
 148enum xp_retval
 149xp_init_uv(void)
 150{
 151        BUG_ON(!is_uv());
 152
 153        xp_max_npartitions = XP_MAX_NPARTITIONS_UV;
 154#ifdef CONFIG_X86
 155        xp_partition_id = sn_partition_id;
 156        xp_region_size = sn_region_size;
 157#endif
 158        xp_pa = xp_pa_uv;
 159        xp_socket_pa = xp_socket_pa_uv;
 160        xp_remote_memcpy = xp_remote_memcpy_uv;
 161        xp_cpu_to_nasid = xp_cpu_to_nasid_uv;
 162        xp_expand_memprotect = xp_expand_memprotect_uv;
 163        xp_restrict_memprotect = xp_restrict_memprotect_uv;
 164
 165        return xpSuccess;
 166}
 167
 168void
 169xp_exit_uv(void)
 170{
 171        BUG_ON(!is_uv());
 172}
 173