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x86/microcode: Simplify init path even more

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Get rid of all the IPI-sending functions and their wrappers and use
those which are supposed to be called on each CPU.

Thus:

- microcode_init_cpu() gets called on each CPU on init, applying any new
  microcode that the driver might've found on the filesystem.

- mc_cpu_starting() simply tries to apply cached microcode as this is
  the cpuhp starting callback which gets called on CPU resume too.

Even if the driver init function is a late initcall, there is no
filesystem by then (not even a hdd driver has been loaded yet) so a new
firmware load attempt cannot simply be done.

It is pointless anyway - for that there's late loading if one really
needs it.

Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Ashok Raj <ashok.raj@intel.com>
Link: https://lore.kernel.org/r/20221028142638.28498-3-bp@alien8.de
This commit is contained in:
Borislav Petkov 2022-10-19 19:07:30 +02:00
parent b6f86689d5
commit 2071c0aeda
1 changed files with 16 additions and 104 deletions
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120
arch/x86/kernel/cpu/microcode/core.c
View file

@ -319,60 +319,6 @@ void reload_early_microcode(void)
}
}
static void collect_cpu_info_local(void *arg)
{
struct cpu_info_ctx *ctx = arg;
ctx->err = microcode_ops->collect_cpu_info(smp_processor_id(),
ctx->cpu_sig);
}
static int collect_cpu_info_on_target(int cpu, struct cpu_signature *cpu_sig)
{
struct cpu_info_ctx ctx = { .cpu_sig = cpu_sig, .err = 0 };
int ret;
ret = smp_call_function_single(cpu, collect_cpu_info_local, &ctx, 1);
if (!ret)
ret = ctx.err;
return ret;
}
static int collect_cpu_info(int cpu)
{
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
int ret;
memset(uci, 0, sizeof(*uci));
ret = collect_cpu_info_on_target(cpu, &uci->cpu_sig);
if (!ret)
uci->valid = 1;
return ret;
}
static void apply_microcode_local(void *arg)
{
enum ucode_state *err = arg;
*err = microcode_ops->apply_microcode(smp_processor_id());
}
static int apply_microcode_on_target(int cpu)
{
enum ucode_state err;
int ret;
ret = smp_call_function_single(cpu, apply_microcode_local, &err, 1);
if (!ret) {
if (err == UCODE_ERROR)
ret = 1;
}
return ret;
}
/* fake device for request_firmware */
static struct platform_device *microcode_pdev;
@ -458,7 +404,7 @@ static int __reload_late(void *info)
* below.
*/
if (cpumask_first(topology_sibling_cpumask(cpu)) == cpu)
apply_microcode_local(&err);
err = microcode_ops->apply_microcode(cpu);
else
goto wait_for_siblings;
@ -480,7 +426,7 @@ wait_for_siblings:
* revision.
*/
if (cpumask_first(topology_sibling_cpumask(cpu)) != cpu)
apply_microcode_local(&err);
err = microcode_ops->apply_microcode(cpu);
return ret;
}
@ -589,51 +535,15 @@ static void microcode_fini_cpu(int cpu)
microcode_ops->microcode_fini_cpu(cpu);
}
static enum ucode_state microcode_resume_cpu(int cpu)
{
if (apply_microcode_on_target(cpu))
return UCODE_ERROR;
pr_debug("CPU%d updated upon resume\n", cpu);
return UCODE_OK;
}
static enum ucode_state microcode_init_cpu(int cpu, bool refresh_fw)
{
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
enum ucode_state ustate;
if (uci->valid)
return UCODE_OK;
if (collect_cpu_info(cpu))
return UCODE_ERROR;
/* --dimm. Trigger a delayed update? */
if (system_state != SYSTEM_RUNNING)
return UCODE_NFOUND;
ustate = microcode_ops->request_microcode_fw(cpu, &microcode_pdev->dev, refresh_fw);
if (ustate == UCODE_NEW) {
pr_debug("CPU%d updated upon init\n", cpu);
apply_microcode_on_target(cpu);
}
return ustate;
}
static enum ucode_state microcode_update_cpu(int cpu)
static enum ucode_state microcode_init_cpu(int cpu)
{
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
/* Refresh CPU microcode revision after resume. */
collect_cpu_info(cpu);
memset(uci, 0, sizeof(*uci));
if (uci->valid)
return microcode_resume_cpu(cpu);
microcode_ops->collect_cpu_info(cpu, &uci->cpu_sig);
return microcode_init_cpu(cpu, false);
return microcode_ops->apply_microcode(cpu);
}
/**
@ -651,14 +561,14 @@ void microcode_bsp_resume(void)
}
static struct syscore_ops mc_syscore_ops = {
.resume = microcode_bsp_resume,
.resume = microcode_bsp_resume,
};
static int mc_cpu_starting(unsigned int cpu)
{
microcode_update_cpu(cpu);
pr_debug("CPU%d added\n", cpu);
return 0;
enum ucode_state err = microcode_ops->apply_microcode(cpu);
return err == UCODE_ERROR;
}
static int mc_cpu_online(unsigned int cpu)
@ -688,11 +598,13 @@ static int mc_cpu_down_prep(unsigned int cpu)
static void setup_online_cpu(struct work_struct *work)
{
int cpu = smp_processor_id();
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
enum ucode_state err;
memset(uci, 0, sizeof(*uci));
microcode_ops->collect_cpu_info(cpu, &uci->cpu_sig);
err = microcode_init_cpu(cpu);
if (err == UCODE_ERROR) {
pr_err("Error applying microcode on CPU%d\n", cpu);
return;
}
mc_cpu_online(cpu);
}