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Commitde22d21

Browse files
atishp04palmer-dabbelt
authored andcommitted
RISC-V: Add page table dump support for uefi
Extend the current page table dump support in RISC-V to include efipages as well.Here is the output of efi runtime page table mappings.---[ UEFI runtime start ]---0x0000000020002000-0x0000000020003000 0x00000000be732000 4K PTE D A . . . W R V0x0000000020018000-0x0000000020019000 0x00000000be738000 4K PTE D A . . . W R V0x000000002002c000-0x000000002002d000 0x00000000be73c000 4K PTE D A . . . W R V0x0000000020031000-0x0000000020032000 0x00000000bff61000 4K PTE D A . . X W R V---[ UEFI runtime end ]---Signed-off-by: Atish Patra <atish.patra@wdc.com>Reviewed-by: Anup Patel <anup@brainfault.org>Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
1 parentb91540d commitde22d21

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-6
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‎arch/riscv/mm/ptdump.c‎

Lines changed: 42 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -3,6 +3,7 @@
33
* Copyright (C) 2019 SiFive
44
*/
55

6+
#include<linux/efi.h>
67
#include<linux/init.h>
78
#include<linux/debugfs.h>
89
#include<linux/seq_file.h>
@@ -49,6 +50,14 @@ struct addr_marker {
4950
constchar*name;
5051
};
5152

53+
/* Private information for debugfs */
54+
structptd_mm_info {
55+
structmm_struct*mm;
56+
conststructaddr_marker*markers;
57+
unsigned longbase_addr;
58+
unsigned longend;
59+
};
60+
5261
staticstructaddr_markeraddress_markers[]= {
5362
#ifdefCONFIG_KASAN
5463
{KASAN_SHADOW_START,"Kasan shadow start"},
@@ -68,6 +77,28 @@ static struct addr_marker address_markers[] = {
6877
{-1,NULL},
6978
};
7079

80+
staticstructptd_mm_infokernel_ptd_info= {
81+
.mm=&init_mm,
82+
.markers=address_markers,
83+
.base_addr=KERN_VIRT_START,
84+
.end=ULONG_MAX,
85+
};
86+
87+
#ifdefCONFIG_EFI
88+
staticstructaddr_markerefi_addr_markers[]= {
89+
{0,"UEFI runtime start" },
90+
{SZ_1G,"UEFI runtime end" },
91+
{-1,NULL }
92+
};
93+
94+
staticstructptd_mm_infoefi_ptd_info= {
95+
.mm=&efi_mm,
96+
.markers=efi_addr_markers,
97+
.base_addr=0,
98+
.end=SZ_2G,
99+
};
100+
#endif
101+
71102
/* Page Table Entry */
72103
structprot_bits {
73104
u64mask;
@@ -245,22 +276,22 @@ static void note_page(struct ptdump_state *pt_st, unsigned long addr,
245276
}
246277
}
247278

248-
staticvoidptdump_walk(structseq_file*s)
279+
staticvoidptdump_walk(structseq_file*s,structptd_mm_info*pinfo)
249280
{
250281
structpg_statest= {
251282
.seq=s,
252-
.marker=address_markers,
283+
.marker=pinfo->markers,
253284
.level=-1,
254285
.ptdump= {
255286
.note_page=note_page,
256287
.range= (structptdump_range[]) {
257-
{KERN_VIRT_START,ULONG_MAX},
288+
{pinfo->base_addr,pinfo->end},
258289
{0,0}
259290
}
260291
}
261292
};
262293

263-
ptdump_walk_pgd(&st.ptdump,&init_mm,NULL);
294+
ptdump_walk_pgd(&st.ptdump,pinfo->mm,NULL);
264295
}
265296

266297
voidptdump_check_wx(void)
@@ -293,7 +324,7 @@ void ptdump_check_wx(void)
293324

294325
staticintptdump_show(structseq_file*m,void*v)
295326
{
296-
ptdump_walk(m);
327+
ptdump_walk(m,m->private);
297328

298329
return0;
299330
}
@@ -308,8 +339,13 @@ static int ptdump_init(void)
308339
for (j=0;j<ARRAY_SIZE(pte_bits);j++)
309340
pg_level[i].mask |=pte_bits[j].mask;
310341

311-
debugfs_create_file("kernel_page_tables",0400,NULL,NULL,
342+
debugfs_create_file("kernel_page_tables",0400,NULL,&kernel_ptd_info,
312343
&ptdump_fops);
344+
#ifdefCONFIG_EFI
345+
if (efi_enabled(EFI_RUNTIME_SERVICES))
346+
debugfs_create_file("efi_page_tables",0400,NULL,&efi_ptd_info,
347+
&ptdump_fops);
348+
#endif
313349

314350
return0;
315351
}

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