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Subject[PATCH 3/3] RISC-V: Fix non-smp kernel boot on SMP systems
Date
In non-smp configuration, hartid can be higher that NR_CPUS.
riscv_of_processor_hartid should not be compared to hartid to
NR_CPUS in that case. Moreover, this function checks all the
DT properties of a hart node. NR_CPUS comparison seems out of
place.

Do cpuid comparison with NR_CPUs in smp setup code. Update the
drivers to handle appropriate code as well.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
---
arch/riscv/kernel/cpu.c | 4 ----
arch/riscv/kernel/smp.c | 1 -
arch/riscv/kernel/smpboot.c | 5 +++++
drivers/clocksource/riscv_timer.c | 21 ++++++++++++++++++---
drivers/irqchip/irq-sifive-plic.c | 5 +++++
5 files changed, 28 insertions(+), 8 deletions(-)

diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
index b4a7d442..251ffab6 100644
--- a/arch/riscv/kernel/cpu.c
+++ b/arch/riscv/kernel/cpu.c
@@ -34,10 +34,6 @@ int riscv_of_processor_hartid(struct device_node *node)
pr_warn("Found CPU without hart ID\n");
return -(ENODEV);
}
- if (hart >= NR_CPUS) {
- pr_info("Found hart ID %d, which is above NR_CPUs. Disabling this hart\n", hart);
- return -(ENODEV);
- }

if (of_property_read_string(node, "status", &status)) {
pr_warn("CPU with hartid=%d has no \"status\" property\n", hart);
diff --git a/arch/riscv/kernel/smp.c b/arch/riscv/kernel/smp.c
index 57b1383e..9ea7ac7d 100644
--- a/arch/riscv/kernel/smp.c
+++ b/arch/riscv/kernel/smp.c
@@ -49,7 +49,6 @@ int riscv_hartid_to_cpuid(int hartid)
return i;

pr_err("Couldn't find cpu id for hartid [%d]\n", hartid);
- BUG();
return i;
}

diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
index bb8cd242..05291840 100644
--- a/arch/riscv/kernel/smpboot.c
+++ b/arch/riscv/kernel/smpboot.c
@@ -66,6 +66,11 @@ void __init setup_smp(void)
found_boot_cpu = 1;
continue;
}
+ if (cpuid >= NR_CPUS) {
+ pr_warn("Invalid cpuid [%d] for hartid [%d]\n",
+ cpuid, hart);
+ break;
+ }

cpuid_to_hartid_map(cpuid) = hart;
set_cpu_possible(cpuid, true);
diff --git a/drivers/clocksource/riscv_timer.c b/drivers/clocksource/riscv_timer.c
index 084e97dc..acf2af10 100644
--- a/drivers/clocksource/riscv_timer.c
+++ b/drivers/clocksource/riscv_timer.c
@@ -89,20 +89,35 @@ static int __init riscv_timer_init_dt(struct device_node *n)
struct clocksource *cs;

hartid = riscv_of_processor_hartid(n);
+ if (hartid < 0) {
+ pr_warn("Not valid hartid for node [%pOF] error = [%d]\n",
+ n, hartid);
+ return hartid;
+ }
cpuid = riscv_hartid_to_cpuid(hartid);

+ if (cpuid < 0)
+ pr_warn("Invalid cpuid for hartid [%d]\n", hartid);
+
if (cpuid != smp_processor_id())
return 0;

+ pr_err("%s: Registering clocksource cpuid [%d] hartid [%d]\n",
+ __func__, cpuid, hartid);
cs = per_cpu_ptr(&riscv_clocksource, cpuid);
- clocksource_register_hz(cs, riscv_timebase);
+ error = clocksource_register_hz(cs, riscv_timebase);

+ if (error) {
+ pr_err("RISCV timer register failed [%d] for cpu = [%d]\n",
+ error, cpuid);
+ return error;
+ }
error = cpuhp_setup_state(CPUHP_AP_RISCV_TIMER_STARTING,
"clockevents/riscv/timer:starting",
riscv_timer_starting_cpu, riscv_timer_dying_cpu);
if (error)
- pr_err("RISCV timer register failed [%d] for cpu = [%d]\n",
- error, cpuid);
+ pr_err("cpu hp setup state failed for RISCV timer [%d]\n",
+ error);
return error;
}

diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
index 357e9daf..254ecd76 100644
--- a/drivers/irqchip/irq-sifive-plic.c
+++ b/drivers/irqchip/irq-sifive-plic.c
@@ -237,6 +237,11 @@ static int __init plic_init(struct device_node *node,
}

cpu = riscv_hartid_to_cpuid(hartid);
+ if (cpu < 0) {
+ pr_warn("Invalid cpuid for context %d\n", i);
+ continue;
+ }
+
handler = per_cpu_ptr(&plic_handlers, cpu);
handler->present = true;
handler->ctxid = i;
--
2.7.4
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