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lib: utils: Improve fdt_cpu_fixup() implementation

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Currently, the fdt_cpu_fixup() implementation assumes:
1. We have one CPU DT for each HART under /cpus DT node
2. The CPU DT nodes are named sequentially (i.e cpu@0,
   cpu@1, ...) which is not true for discontinuous and
   sparse HART ids (i.e. cpu@0, cpu@4, cpu@5). Generally,
   CPU DT node are named based on HART id and not HART
   index

If any of the above assumptions are violated then the
fdt_cpu_fixup() will not work.

This improves fdt_cpu_fixup() implementation and makes
it independent of above assumptions.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel 2020-03-19 11:23:41 +05:30 • committed by Anup Patel
parent 550ba88db1
commit 160c88535f
1 changed files with 24 additions and 11 deletions
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35
lib/utils/fdt/fdt_fixup.c
View file

@ -12,30 +12,43 @@
#include <sbi/sbi_console.h>
#include <sbi/sbi_platform.h>
#include <sbi/sbi_scratch.h>
#include <sbi/sbi_string.h>
void fdt_cpu_fixup(void *fdt)
{
struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
const struct sbi_platform *plat = sbi_platform_ptr(scratch);
char cpu_node[32] = "";
int cpu_offset;
int err;
u32 i;
int err, len, cpu_offset, cpus_offset;
const fdt32_t *val;
const void *prop;
u32 hartid;
err = fdt_open_into(fdt, fdt, fdt_totalsize(fdt) + 32);
if (err < 0)
return;
/* assume hart ids are continuous */
for (i = 0; i < sbi_platform_hart_count(plat); i++) {
sbi_sprintf(cpu_node, "/cpus/cpu@%d", i);
cpu_offset = fdt_path_offset(fdt, cpu_node);
cpus_offset = fdt_path_offset(fdt, "/cpus");
if (cpus_offset < 0)
return;
if (sbi_platform_hart_invalid(plat, i))
fdt_for_each_subnode(cpu_offset, fdt, cpus_offset) {
prop = fdt_getprop(fdt, cpu_offset, "device_type", &len);
if (!prop || !len)
continue;
if (sbi_strcmp(prop, "cpu"))
continue;
val = fdt_getprop(fdt, cpu_offset, "reg", &len);
if (!val || len < sizeof(fdt32_t))
continue;
if (len > sizeof(fdt32_t))
val++;
hartid = fdt32_to_cpu(*val);
if (sbi_platform_hart_invalid(plat, hartid))
fdt_setprop_string(fdt, cpu_offset, "status",
"disabled");
memset(cpu_node, 0, sizeof(cpu_node));
}
}