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RISC-V: Show CPU ID and Hart ID separately in /proc/cpuinfo
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Currently, /proc/cpuinfo show logical CPU ID as Hart ID which
is in-correct. This patch shows CPU ID and Hart ID separately
in /proc/cpuinfo using cpuid_to_hardid_map().

With this patch, contents of /proc/cpuinfo looks as follows:
processor	: 0
hart		: 1
isa		: rv64imafdc
mmu		: sv48

processor	: 1
hart		: 0
isa		: rv64imafdc
mmu		: sv48

processor	: 2
hart		: 2
isa		: rv64imafdc
mmu		: sv48

processor	: 3
hart		: 3
isa		: rv64imafdc
mmu		: sv48

Signed-off-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
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Anup Patel authored and Palmer Dabbelt committed Oct 23, 2018
1 parent f99fb60 commit 4b26d22
Showing 1 changed file with 6 additions and 4 deletions.
10 changes: 6 additions & 4 deletions arch/riscv/kernel/cpu.c
Original file line number Diff line number Diff line change
Expand Up @@ -81,7 +81,7 @@ static void print_isa(struct seq_file *f, const char *orig_isa)
#endif

/* Print the base ISA, as we already know it's legal. */
seq_puts(f, "isa\t: ");
seq_puts(f, "isa\t\t: ");
seq_write(f, isa, 5);
isa += 5;

Expand All @@ -96,6 +96,7 @@ static void print_isa(struct seq_file *f, const char *orig_isa)
isa++;
}
}
seq_puts(f, "\n");

/*
* If we were given an unsupported ISA in the device tree then print
Expand All @@ -116,7 +117,7 @@ static void print_mmu(struct seq_file *f, const char *mmu_type)
return;
#endif

seq_printf(f, "mmu\t: %s\n", mmu_type+6);
seq_printf(f, "mmu\t\t: %s\n", mmu_type+6);
}

static void *c_start(struct seq_file *m, loff_t *pos)
Expand Down Expand Up @@ -144,14 +145,15 @@ static int c_show(struct seq_file *m, void *v)
NULL);
const char *compat, *isa, *mmu;

seq_printf(m, "hart\t: %lu\n", cpu_id);
seq_printf(m, "processor\t: %lu\n", cpu_id);
seq_printf(m, "hart\t\t: %lu\n", cpuid_to_hartid_map(cpu_id));
if (!of_property_read_string(node, "riscv,isa", &isa))
print_isa(m, isa);
if (!of_property_read_string(node, "mmu-type", &mmu))
print_mmu(m, mmu);
if (!of_property_read_string(node, "compatible", &compat)
&& strcmp(compat, "riscv"))
seq_printf(m, "uarch\t: %s\n", compat);
seq_printf(m, "uarch\t\t: %s\n", compat);
seq_puts(m, "\n");

return 0;
Expand Down

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