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riscv: Use pgtable_l4_enabled to output mmu_type in cpuinfo

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Now that the mmu type is determined at runtime using SATP
characteristic, use the global variable pgtable_l4_enabled to output
mmu type of the processor through /proc/cpuinfo instead of relying on
device tree infos.

Signed-off-by: Alexandre Ghiti <alexandre.ghiti@canonical.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Alexandre Ghiti 2021-12-06 11:46:52 +01:00 committed by Palmer Dabbelt
parent e8a62cc26d
commit 73c7c8f68e
No known key found for this signature in database
GPG Key ID: 2E1319F35FBB1889
1 changed files with 14 additions and 13 deletions
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27
arch/riscv/kernel/cpu.c
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@ -7,6 +7,7 @@
#include <linux/seq_file.h>
#include <linux/of.h>
#include <asm/smp.h>
#include <asm/pgtable.h>
/*
* Returns the hart ID of the given device tree node, or -ENODEV if the node
@ -71,18 +72,19 @@ static void print_isa(struct seq_file *f, const char *isa)
seq_puts(f, "\n");
}
static void print_mmu(struct seq_file *f, const char *mmu_type)
static void print_mmu(struct seq_file *f)
{
#if defined(CONFIG_32BIT)
if (strcmp(mmu_type, "riscv,sv32") != 0)
return;
#elif defined(CONFIG_64BIT)
if (strcmp(mmu_type, "riscv,sv39") != 0 &&
strcmp(mmu_type, "riscv,sv48") != 0)
return;
#endif
char sv_type[16];
seq_printf(f, "mmu\t\t: %s\n", mmu_type+6);
#if defined(CONFIG_32BIT)
strncpy(sv_type, "sv32", 5);
#elif defined(CONFIG_64BIT)
if (pgtable_l4_enabled)
strncpy(sv_type, "sv48", 5);
else
strncpy(sv_type, "sv39", 5);
#endif
seq_printf(f, "mmu\t\t: %s\n", sv_type);
}
static void *c_start(struct seq_file *m, loff_t *pos)
@ -107,14 +109,13 @@ static int c_show(struct seq_file *m, void *v)
{
unsigned long cpu_id = (unsigned long)v - 1;
struct device_node *node = of_get_cpu_node(cpu_id, NULL);
const char *compat, *isa, *mmu;
const char *compat, *isa;
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);
print_mmu(m);
if (!of_property_read_string(node, "compatible", &compat)
&& strcmp(compat, "riscv"))
seq_printf(m, "uarch\t\t: %s\n", compat);