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Linux/arch/powerpc/mm/ptdump/bats.c

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  1 // SPDX-License-Identifier: GPL-2.0+
  2 /*
  3  * Copyright 2018, Christophe Leroy CS S.I.
  4  * <christophe.leroy@c-s.fr>
  5  *
  6  * This dumps the content of BATS
  7  */
  8 
  9 #include <linux/pgtable.h>
 10 #include <asm/debugfs.h>
 11 #include <asm/cpu_has_feature.h>
 12 
 13 #include "ptdump.h"
 14 
 15 static char *pp_601(int k, int pp)
 16 {
 17         if (pp == 0)
 18                 return k ? "   " : "rwx";
 19         if (pp == 1)
 20                 return k ? "r x" : "rwx";
 21         if (pp == 2)
 22                 return "rwx";
 23         return "r x";
 24 }
 25 
 26 static void bat_show_601(struct seq_file *m, int idx, u32 lower, u32 upper)
 27 {
 28         u32 blpi = upper & 0xfffe0000;
 29         u32 k = (upper >> 2) & 3;
 30         u32 pp = upper & 3;
 31         phys_addr_t pbn = PHYS_BAT_ADDR(lower);
 32         u32 bsm = lower & 0x3ff;
 33         u32 size = (bsm + 1) << 17;
 34 
 35         seq_printf(m, "%d: ", idx);
 36         if (!(lower & 0x40)) {
 37                 seq_puts(m, "        -\n");
 38                 return;
 39         }
 40 
 41         seq_printf(m, "0x%08x-0x%08x ", blpi, blpi + size - 1);
 42 #ifdef CONFIG_PHYS_64BIT
 43         seq_printf(m, "0x%016llx ", pbn);
 44 #else
 45         seq_printf(m, "0x%08x ", pbn);
 46 #endif
 47         pt_dump_size(m, size);
 48 
 49         seq_printf(m, "Kernel %s User %s", pp_601(k & 2, pp), pp_601(k & 1, pp));
 50 
 51         seq_puts(m, lower & _PAGE_WRITETHRU ? "w " : "  ");
 52         seq_puts(m, lower & _PAGE_NO_CACHE ? "i " : "  ");
 53         seq_puts(m, lower & _PAGE_COHERENT ? "m " : "  ");
 54         seq_puts(m, "\n");
 55 }
 56 
 57 #define BAT_SHOW_601(_m, _n, _l, _u) bat_show_601(_m, _n, mfspr(_l), mfspr(_u))
 58 
 59 static int bats_show_601(struct seq_file *m, void *v)
 60 {
 61         seq_puts(m, "---[ Block Address Translation ]---\n");
 62 
 63         BAT_SHOW_601(m, 0, SPRN_IBAT0L, SPRN_IBAT0U);
 64         BAT_SHOW_601(m, 1, SPRN_IBAT1L, SPRN_IBAT1U);
 65         BAT_SHOW_601(m, 2, SPRN_IBAT2L, SPRN_IBAT2U);
 66         BAT_SHOW_601(m, 3, SPRN_IBAT3L, SPRN_IBAT3U);
 67 
 68         return 0;
 69 }
 70 
 71 static void bat_show_603(struct seq_file *m, int idx, u32 lower, u32 upper, bool is_d)
 72 {
 73         u32 bepi = upper & 0xfffe0000;
 74         u32 bl = (upper >> 2) & 0x7ff;
 75         u32 k = upper & 3;
 76         phys_addr_t brpn = PHYS_BAT_ADDR(lower);
 77         u32 size = (bl + 1) << 17;
 78 
 79         seq_printf(m, "%d: ", idx);
 80         if (k == 0) {
 81                 seq_puts(m, "        -\n");
 82                 return;
 83         }
 84 
 85         seq_printf(m, "0x%08x-0x%08x ", bepi, bepi + size - 1);
 86 #ifdef CONFIG_PHYS_64BIT
 87         seq_printf(m, "0x%016llx ", brpn);
 88 #else
 89         seq_printf(m, "0x%08x ", brpn);
 90 #endif
 91         pt_dump_size(m, size);
 92 
 93         if (k == 1)
 94                 seq_puts(m, "User ");
 95         else if (k == 2)
 96                 seq_puts(m, "Kernel ");
 97         else
 98                 seq_puts(m, "Kernel/User ");
 99 
100         if (lower & BPP_RX)
101                 seq_puts(m, is_d ? "r   " : "  x ");
102         else if (lower & BPP_RW)
103                 seq_puts(m, is_d ? "rw  " : "  x ");
104         else
105                 seq_puts(m, is_d ? "    " : "    ");
106 
107         seq_puts(m, lower & _PAGE_WRITETHRU ? "w " : "  ");
108         seq_puts(m, lower & _PAGE_NO_CACHE ? "i " : "  ");
109         seq_puts(m, lower & _PAGE_COHERENT ? "m " : "  ");
110         seq_puts(m, lower & _PAGE_GUARDED ? "g " : "  ");
111         seq_puts(m, "\n");
112 }
113 
114 #define BAT_SHOW_603(_m, _n, _l, _u, _d) bat_show_603(_m, _n, mfspr(_l), mfspr(_u), _d)
115 
116 static int bats_show_603(struct seq_file *m, void *v)
117 {
118         seq_puts(m, "---[ Instruction Block Address Translation ]---\n");
119 
120         BAT_SHOW_603(m, 0, SPRN_IBAT0L, SPRN_IBAT0U, false);
121         BAT_SHOW_603(m, 1, SPRN_IBAT1L, SPRN_IBAT1U, false);
122         BAT_SHOW_603(m, 2, SPRN_IBAT2L, SPRN_IBAT2U, false);
123         BAT_SHOW_603(m, 3, SPRN_IBAT3L, SPRN_IBAT3U, false);
124         if (mmu_has_feature(MMU_FTR_USE_HIGH_BATS)) {
125                 BAT_SHOW_603(m, 4, SPRN_IBAT4L, SPRN_IBAT4U, false);
126                 BAT_SHOW_603(m, 5, SPRN_IBAT5L, SPRN_IBAT5U, false);
127                 BAT_SHOW_603(m, 6, SPRN_IBAT6L, SPRN_IBAT6U, false);
128                 BAT_SHOW_603(m, 7, SPRN_IBAT7L, SPRN_IBAT7U, false);
129         }
130 
131         seq_puts(m, "\n---[ Data Block Address Translation ]---\n");
132 
133         BAT_SHOW_603(m, 0, SPRN_DBAT0L, SPRN_DBAT0U, true);
134         BAT_SHOW_603(m, 1, SPRN_DBAT1L, SPRN_DBAT1U, true);
135         BAT_SHOW_603(m, 2, SPRN_DBAT2L, SPRN_DBAT2U, true);
136         BAT_SHOW_603(m, 3, SPRN_DBAT3L, SPRN_DBAT3U, true);
137         if (mmu_has_feature(MMU_FTR_USE_HIGH_BATS)) {
138                 BAT_SHOW_603(m, 4, SPRN_DBAT4L, SPRN_DBAT4U, true);
139                 BAT_SHOW_603(m, 5, SPRN_DBAT5L, SPRN_DBAT5U, true);
140                 BAT_SHOW_603(m, 6, SPRN_DBAT6L, SPRN_DBAT6U, true);
141                 BAT_SHOW_603(m, 7, SPRN_DBAT7L, SPRN_DBAT7U, true);
142         }
143 
144         return 0;
145 }
146 
147 static int bats_open(struct inode *inode, struct file *file)
148 {
149         if (IS_ENABLED(CONFIG_PPC_BOOK3S_601))
150                 return single_open(file, bats_show_601, NULL);
151 
152         return single_open(file, bats_show_603, NULL);
153 }
154 
155 static const struct file_operations bats_fops = {
156         .open           = bats_open,
157         .read           = seq_read,
158         .llseek         = seq_lseek,
159         .release        = single_release,
160 };
161 
162 static int __init bats_init(void)
163 {
164         debugfs_create_file("block_address_translation", 0400,
165                             powerpc_debugfs_root, NULL, &bats_fops);
166         return 0;
167 }
168 device_initcall(bats_init);
169 

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