path: root/drivers/platform/x86/intel/ifs/runtest.c

// SPDX-License-Identifier: GPL-2.0-only
/* Copyright(c) 2022 Intel Corporation. */

#include <linux/cpu.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/nmi.h>
#include <linux/slab.h>
#include <linux/stop_machine.h>

#include "ifs.h"

/*
 * Note all code and data in this file is protected by
 * ifs_sem. On HT systems all threads on a core will
 * execute together, but only the first thread on the
 * core will update results of the test.
 */

#define CREATE_TRACE_POINTS
#include <trace/events/intel_ifs.h>

/* Max retries on the same chunk */
#define MAX_IFS_RETRIES  5

struct run_params {
	struct ifs_data *ifsd;
	union ifs_scan *activate;
	union ifs_status status;
};

struct sbaf_run_params {
	struct ifs_data *ifsd;
	int *retry_cnt;
	union ifs_sbaf *activate;
	union ifs_sbaf_status status;
};

/*
 * Number of TSC cycles that a logical CPU will wait for the other
 * logical CPU on the core in the WRMSR(ACTIVATE_SCAN).
 */
#define IFS_THREAD_WAIT 100000

enum ifs_status_err_code {
	IFS_NO_ERROR				= 0,
	IFS_OTHER_THREAD_COULD_NOT_JOIN		= 1,
	IFS_INTERRUPTED_BEFORE_RENDEZVOUS	= 2,
	IFS_POWER_MGMT_INADEQUATE_FOR_SCAN	= 3,
	IFS_INVALID_CHUNK_RANGE			= 4,
	IFS_MISMATCH_ARGUMENTS_BETWEEN_THREADS	= 5,
	IFS_CORE_NOT_CAPABLE_CURRENTLY		= 6,
	IFS_UNASSIGNED_ERROR_CODE		= 7,
	IFS_EXCEED_NUMBER_OF_THREADS_CONCURRENT	= 8,
	IFS_INTERRUPTED_DURING_EXECUTION	= 9,
	IFS_UNASSIGNED_ERROR_CODE_0xA		= 0xA,
	IFS_CORRUPTED_CHUNK		= 0xB,
};

static const char * const scan_test_status[] = {
	[IFS_NO_ERROR] = "SCAN no error",
	[IFS_OTHER_THREAD_COULD_NOT_JOIN] = "Other thread could not join.",
	[IFS_INTERRUPTED_BEFORE_RENDEZVOUS] = "Interrupt occurred prior to SCAN coordination.",
	[IFS_POWER_MGMT_INADEQUATE_FOR_SCAN] =
	"Core Abort SCAN Response due to power management condition.",
	[IFS_INVALID_CHUNK_RANGE] = "Non valid chunks in the range",
	[IFS_MISMATCH_ARGUMENTS_BETWEEN_THREADS] = "Mismatch in arguments between threads T0/T1.",
	[IFS_CORE_NOT_CAPABLE_CURRENTLY] = "Core not capable of performing SCAN currently",
	[IFS_UNASSIGNED_ERROR_CODE] = "Unassigned error code 0x7",
	[IFS_EXCEED_NUMBER_OF_THREADS_CONCURRENT] =
	"Exceeded number of Logical Processors (LP) allowed to run Scan-At-Field concurrently",
	[IFS_INTERRUPTED_DURING_EXECUTION] = "Interrupt occurred prior to SCAN start",
	[IFS_UNASSIGNED_ERROR_CODE_0xA] = "Unassigned error code 0xA",
	[IFS_CORRUPTED_CHUNK] = "Scan operation aborted due to corrupted image. Try reloading",
};

static void message_not_tested(struct device *dev, int cpu, union ifs_status status)
{
	struct ifs_data *ifsd = ifs_get_data(dev);

	/*
	 * control_error is set when the microcode runs into a problem
	 * loading the image from the reserved BIOS memory, or it has
	 * been corrupted. Reloading the image may fix this issue.
	 */
	if (status.control_error) {
		dev_warn(dev, "CPU(s) %*pbl: Scan controller error. Batch: %02x version: 0x%x\n",
			 cpumask_pr_args(cpu_smt_mask(cpu)), ifsd->cur_batch, ifsd->loaded_version);
		return;
	}

	if (status.error_code < ARRAY_SIZE(scan_test_status)) {
		dev_info(dev, "CPU(s) %*pbl: SCAN operation did not start. %s\n",
			 cpumask_pr_args(cpu_smt_mask(cpu)),
			 scan_test_status[status.error_code]);
	} else if (status.error_code == IFS_SW_TIMEOUT) {
		dev_info(dev, "CPU(s) %*pbl: software timeout during scan\n",
			 cpumask_pr_args(cpu_smt_mask(cpu)));
	} else if (status.error_code == IFS_SW_PARTIAL_COMPLETION) {
		dev_info(dev, "CPU(s) %*pbl: %s\n",
			 cpumask_pr_args(cpu_smt_mask(cpu)),
			 "Not all scan chunks were executed. Maximum forward progress retries exceeded");
	} else {
		dev_info(dev, "CPU(s) %*pbl: SCAN unknown status %llx\n",
			 cpumask_pr_args(cpu_smt_mask(cpu)), status.data);
	}
}

static void message_fail(struct device *dev, int cpu, union ifs_status status)
{
	struct ifs_data *ifsd = ifs_get_data(dev);

	/*
	 * signature_error is set when the output from the scan chains does not
	 * match the expected signature. This might be a transient problem (e.g.
	 * due to a bit flip from an alpha particle or neutron). If the problem
	 * repeats on a subsequent test, then it indicates an actual problem in
	 * the core being tested.
	 */
	if (status.signature_error) {
		dev_err(dev, "CPU(s) %*pbl: test signature incorrect. Batch: %02x version: 0x%x\n",
			cpumask_pr_args(cpu_smt_mask(cpu)), ifsd->cur_batch, ifsd->loaded_version);
	}
}

static bool can_restart(union ifs_status status)
{
	enum ifs_status_err_code err_code = status.error_code;

	/* Signature for chunk is bad, or scan test failed */
	if (status.signature_error || status.control_error)
		return false;

	switch (err_code) {
	case IFS_NO_ERROR:
	case IFS_OTHER_THREAD_COULD_NOT_JOIN:
	case IFS_INTERRUPTED_BEFORE_RENDEZVOUS:
	case IFS_POWER_MGMT_INADEQUATE_FOR_SCAN:
	case IFS_EXCEED_NUMBER_OF_THREADS_CONCURRENT:
	case IFS_INTERRUPTED_DURING_EXECUTION:
		return true;
	case IFS_INVALID_CHUNK_RANGE:
	case IFS_MISMATCH_ARGUMENTS_BETWEEN_THREADS:
	case IFS_CORE_NOT_CAPABLE_CURRENTLY:
	case IFS_UNASSIGNED_ERROR_CODE:
	case IFS_UNASSIGNED_ERROR_CODE_0xA:
	case IFS_CORRUPTED_CHUNK:
		break;
	}
	return false;
}

#define SPINUNIT 100 /* 100 nsec */
static atomic_t array_cpus_in;
static atomic_t scan_cpus_in;
static atomic_t sbaf_cpus_in;

/*
 * Simplified cpu sibling rendezvous loop based on microcode loader __wait_for_cpus()
 */
static void wait_for_sibling_cpu(atomic_t *t, long long timeout)
{
	int cpu = smp_processor_id();
	const struct cpumask *smt_mask = cpu_smt_mask(cpu);
	int all_cpus = cpumask_weight(smt_mask);

	atomic_inc(t);
	while (atomic_read(t) < all_cpus) {
		if (timeout < SPINUNIT)
			return;
		ndelay(SPINUNIT);
		timeout -= SPINUNIT;
		touch_nmi_watchdog();
	}
}

/*
 * Execute the scan. Called "simultaneously" on all threads of a core
 * at high priority using the stop_cpus mechanism.
 */
static int doscan(void *data)
{
	int cpu = smp_processor_id(), start, stop;
	struct run_params *params = data;
	union ifs_status status;
	struct ifs_data *ifsd;
	int first;

	ifsd = params->ifsd;

	if (ifsd->generation) {
		start = params->activate->gen2.start;
		stop = params->activate->gen2.stop;
	} else {
		start = params->activate->gen0.start;
		stop = params->activate->gen0.stop;
	}

	/* Only the first logical CPU on a core reports result */
	first = cpumask_first(cpu_smt_mask(cpu));

	wait_for_sibling_cpu(&scan_cpus_in, NSEC_PER_SEC);

	/*
	 * This WRMSR will wait for other HT threads to also write
	 * to this MSR (at most for activate.delay cycles). Then it
	 * starts scan of each requested chunk. The core scan happens
	 * during the "execution" of the WRMSR. This instruction can
	 * take up to 200 milliseconds (in the case where all chunks
	 * are processed in a single pass) before it retires.
	 */
	wrmsrl(MSR_ACTIVATE_SCAN, params->activate->data);
	rdmsrl(MSR_SCAN_STATUS, status.data);

	trace_ifs_status(ifsd->cur_batch, start, stop, status.data);

	/* Pass back the result of the scan */
	if (cpu == first)
		params->status = status;

	return 0;
}

/*
 * Use stop_core_cpuslocked() to synchronize writing to MSR_ACTIVATE_SCAN
 * on all threads of the core to be tested. Loop if necessary to complete
 * run of all chunks. Include some defensive tests to make sure forward
 * progress is made, and that the whole test completes in a reasonable time.
 */
static void ifs_test_core(int cpu, struct device *dev)
{
	union ifs_status status = {};
	union ifs_scan activate;
	unsigned long timeout;
	struct ifs_data *ifsd;
	int to_start, to_stop;
	int status_chunk;
	struct run_params params;
	int retries;

	ifsd = ifs_get_data(dev);

	activate.gen0.rsvd = 0;
	activate.delay = IFS_THREAD_WAIT;
	activate.sigmce = 0;
	to_start = 0;
	to_stop = ifsd->valid_chunks - 1;

	params.ifsd = ifs_get_data(dev);

	if (ifsd->generation) {
		activate.gen2.start = to_start;
		activate.gen2.stop = to_stop;
	} else {
		activate.gen0.start = to_start;
		activate.gen0.stop = to_stop;
	}

	timeout = jiffies + HZ / 2;
	retries = MAX_IFS_RETRIES;

	while (to_start <= to_stop) {
		if (time_after(jiffies, timeout)) {
			status.error_code = IFS_SW_TIMEOUT;
			break;
		}

		params.activate = &activate;
		atomic_set(&scan_cpus_in, 0);
		stop_core_cpuslocked(cpu, doscan, &params);

		status = params.status;

		/* Some cases can be retried, give up for others */
		if (!can_restart(status))
			break;

		status_chunk = ifsd->generation ? status.gen2.chunk_num : status.gen0.chunk_num;
		if (status_chunk == to_start) {
			/* Check for forward progress */
			if (--retries == 0) {
				if (status.error_code == IFS_NO_ERROR)
					status.error_code = IFS_SW_PARTIAL_COMPLETION;
				break;
			}
		} else {
			retries = MAX_IFS_RETRIES;
			if (ifsd->generation)
				activate.gen2.start = status_chunk;
			else
				activate.gen0.start = status_chunk;
			to_start = status_chunk;
		}
	}

	/* Update status for this core */
	ifsd->scan_details = status.data;

	if (status.signature_error) {
		ifsd->status = SCAN_TEST_FAIL;
		message_fail(dev, cpu, status);
	} else if (status.control_error || status.error_code) {
		ifsd->status = SCAN_NOT_TESTED;
		message_not_tested(dev, cpu, status);
	} else {
		ifsd->status = SCAN_TEST_PASS;
	}
}

static int do_array_test(void *data)
{
	union ifs_array *command = data;
	int cpu = smp_processor_id();
	int first;

	wait_for_sibling_cpu(&array_cpus_in, NSEC_PER_SEC);

	/*
	 * Only one logical CPU on a core needs to trigger the Array test via MSR write.
	 */
	first = cpumask_first(cpu_smt_mask(cpu));

	if (cpu == first) {
		wrmsrl(MSR_ARRAY_BIST, command->data);
		/* Pass back the result of the test */
		rdmsrl(MSR_ARRAY_BIST, command->data);
	}

	return 0;
}

static void ifs_array_test_core(int cpu, struct device *dev)
{
	union ifs_array command = {};
	bool timed_out = false;
	struct ifs_data *ifsd;
	unsigned long timeout;

	ifsd = ifs_get_data(dev);

	command.array_bitmask = ~0U;
	timeout = jiffies + HZ / 2;

	do {
		if (time_after(jiffies, timeout)) {
			timed_out = true;
			break;
		}
		atomic_set(&array_cpus_in, 0);
		stop_core_cpuslocked(cpu, do_array_test, &command);

		if (command.ctrl_result)
			break;
	} while (command.array_bitmask);

	ifsd->scan_details = command.data;

	if (command.ctrl_result)
		ifsd->status = SCAN_TEST_FAIL;
	else if (timed_out || command.array_bitmask)
		ifsd->status = SCAN_NOT_TESTED;
	else
		ifsd->status = SCAN_TEST_PASS;
}

#define ARRAY_GEN1_TEST_ALL_ARRAYS	0x0ULL
#define ARRAY_GEN1_STATUS_FAIL		0x1ULL

static int do_array_test_gen1(void *status)
{
	int cpu = smp_processor_id();
	int first;

	first = cpumask_first(cpu_smt_mask(cpu));

	if (cpu == first) {
		wrmsrl(MSR_ARRAY_TRIGGER, ARRAY_GEN1_TEST_ALL_ARRAYS);
		rdmsrl(MSR_ARRAY_STATUS, *((u64 *)status));
	}

	return 0;
}

static void ifs_array_test_gen1(int cpu, struct device *dev)
{
	struct ifs_data *ifsd = ifs_get_data(dev);
	u64 status = 0;

	stop_core_cpuslocked(cpu, do_array_test_gen1, &status);
	ifsd->scan_details = status;

	if (status & ARRAY_GEN1_STATUS_FAIL)
		ifsd->status = SCAN_TEST_FAIL;
	else
		ifsd->status = SCAN_TEST_PASS;
}

#define SBAF_STATUS_PASS			0
#define SBAF_STATUS_SIGN_FAIL			1
#define SBAF_STATUS_INTR			2
#define SBAF_STATUS_TEST_FAIL			3

enum sbaf_status_err_code {
	IFS_SBAF_NO_ERROR				= 0,
	IFS_SBAF_OTHER_THREAD_COULD_NOT_JOIN		= 1,
	IFS_SBAF_INTERRUPTED_BEFORE_RENDEZVOUS		= 2,
	IFS_SBAF_UNASSIGNED_ERROR_CODE3			= 3,
	IFS_SBAF_INVALID_BUNDLE_INDEX			= 4,
	IFS_SBAF_MISMATCH_ARGS_BETWEEN_THREADS		= 5,
	IFS_SBAF_CORE_NOT_CAPABLE_CURRENTLY		= 6,
	IFS_SBAF_UNASSIGNED_ERROR_CODE7			= 7,
	IFS_SBAF_EXCEED_NUMBER_OF_THREADS_CONCURRENT	= 8,
	IFS_SBAF_INTERRUPTED_DURING_EXECUTION		= 9,
	IFS_SBAF_INVALID_PROGRAM_INDEX			= 0xA,
	IFS_SBAF_CORRUPTED_CHUNK			= 0xB,
	IFS_SBAF_DID_NOT_START				= 0xC,
};

static const char * const sbaf_test_status[] = {
	[IFS_SBAF_NO_ERROR] = "SBAF no error",
	[IFS_SBAF_OTHER_THREAD_COULD_NOT_JOIN] = "Other thread could not join.",
	[IFS_SBAF_INTERRUPTED_BEFORE_RENDEZVOUS] = "Interrupt occurred prior to SBAF coordination.",
	[IFS_SBAF_UNASSIGNED_ERROR_CODE3] = "Unassigned error code 0x3",
	[IFS_SBAF_INVALID_BUNDLE_INDEX] = "Non-valid sbaf bundles. Reload test image",
	[IFS_SBAF_MISMATCH_ARGS_BETWEEN_THREADS] = "Mismatch in arguments between threads T0/T1.",
	[IFS_SBAF_CORE_NOT_CAPABLE_CURRENTLY] = "Core not capable of performing SBAF currently",
	[IFS_SBAF_UNASSIGNED_ERROR_CODE7] = "Unassigned error code 0x7",
	[IFS_SBAF_EXCEED_NUMBER_OF_THREADS_CONCURRENT] = "Exceeded number of Logical Processors (LP) allowed to run Scan-At-Field concurrently",
	[IFS_SBAF_INTERRUPTED_DURING_EXECUTION] = "Interrupt occurred prior to SBAF start",
	[IFS_SBAF_INVALID_PROGRAM_INDEX] = "SBAF program index not valid",
	[IFS_SBAF_CORRUPTED_CHUNK] = "SBAF operation aborted due to corrupted chunk",
	[IFS_SBAF_DID_NOT_START] = "SBAF operation did not start",
};

static void sbaf_message_not_tested(struct device *dev, int cpu, u64 status_data)
{
	union ifs_sbaf_status status = (union ifs_sbaf_status)status_data;

	if (status.error_code < ARRAY_SIZE(sbaf_test_status)) {
		dev_info(dev, "CPU(s) %*pbl: SBAF operation did not start. %s\n",
			 cpumask_pr_args(cpu_smt_mask(cpu)),
			 sbaf_test_status[status.error_code]);
	} else if (status.error_code == IFS_SW_TIMEOUT) {
		dev_info(dev, "CPU(s) %*pbl: software timeout during scan\n",
			 cpumask_pr_args(cpu_smt_mask(cpu)));
	} else if (status.error_code == IFS_SW_PARTIAL_COMPLETION) {
		dev_info(dev, "CPU(s) %*pbl: %s\n",
			 cpumask_pr_args(cpu_smt_mask(cpu)),
			 "Not all SBAF bundles executed. Maximum forward progress retries exceeded");
	} else {
		dev_info(dev, "CPU(s) %*pbl: SBAF unknown status %llx\n",
			 cpumask_pr_args(cpu_smt_mask(cpu)), status.data);
	}
}

static void sbaf_message_fail(struct device *dev, int cpu, union ifs_sbaf_status status)
{
	/* Failed signature check is set when SBAF signature did not match the expected value */
	if (status.sbaf_status == SBAF_STATUS_SIGN_FAIL) {
		dev_err(dev, "CPU(s) %*pbl: Failed signature check\n",
			cpumask_pr_args(cpu_smt_mask(cpu)));
	}

	/* Failed to reach end of test */
	if (status.sbaf_status == SBAF_STATUS_TEST_FAIL) {
		dev_err(dev, "CPU(s) %*pbl: Failed to complete test\n",
			cpumask_pr_args(cpu_smt_mask(cpu)));
	}
}

static bool sbaf_bundle_completed(union ifs_sbaf_status status)
{
	return !(status.sbaf_status || status.error_code);
}

static bool sbaf_can_restart(union ifs_sbaf_status status)
{
	enum sbaf_status_err_code err_code = status.error_code;

	/* Signature for chunk is bad, or scan test failed */
	if (status.sbaf_status == SBAF_STATUS_SIGN_FAIL ||
	    status.sbaf_status == SBAF_STATUS_TEST_FAIL)
		return false;

	switch (err_code) {
	case IFS_SBAF_NO_ERROR:
	case IFS_SBAF_OTHER_THREAD_COULD_NOT_JOIN:
	case IFS_SBAF_INTERRUPTED_BEFORE_RENDEZVOUS:
	case IFS_SBAF_EXCEED_NUMBER_OF_THREADS_CONCURRENT:
	case IFS_SBAF_INTERRUPTED_DURING_EXECUTION:
		return true;
	case IFS_SBAF_UNASSIGNED_ERROR_CODE3:
	case IFS_SBAF_INVALID_BUNDLE_INDEX:
	case IFS_SBAF_MISMATCH_ARGS_BETWEEN_THREADS:
	case IFS_SBAF_CORE_NOT_CAPABLE_CURRENTLY:
	case IFS_SBAF_UNASSIGNED_ERROR_CODE7:
	case IFS_SBAF_INVALID_PROGRAM_INDEX:
	case IFS_SBAF_CORRUPTED_CHUNK:
	case IFS_SBAF_DID_NOT_START:
		break;
	}
	return false;
}

/*
 * Execute the SBAF test. Called "simultaneously" on all threads of a core
 * at high priority using the stop_cpus mechanism.
 */
static int dosbaf(void *data)
{
	struct sbaf_run_params *run_params = data;
	int cpu = smp_processor_id();
	union ifs_sbaf_status status;
	struct ifs_data *ifsd;
	int first;

	ifsd = run_params->ifsd;

	/* Only the first logical CPU on a core reports result */
	first = cpumask_first(cpu_smt_mask(cpu));
	wait_for_sibling_cpu(&sbaf_cpus_in, NSEC_PER_SEC);

	/*
	 * This WRMSR will wait for other HT threads to also write
	 * to this MSR (at most for activate.delay cycles). Then it
	 * starts scan of each requested bundle. The core test happens
	 * during the "execution" of the WRMSR.
	 */
	wrmsrl(MSR_ACTIVATE_SBAF, run_params->activate->data);
	rdmsrl(MSR_SBAF_STATUS, status.data);
	trace_ifs_sbaf(ifsd->cur_batch, *run_params->activate, status);

	/* Pass back the result of the test */
	if (cpu == first)
		run_params->status = status;

	return 0;
}

static void ifs_sbaf_test_core(int cpu, struct device *dev)
{
	struct sbaf_run_params run_params;
	union ifs_sbaf_status status = {};
	union ifs_sbaf activate;
	unsigned long timeout;
	struct ifs_data *ifsd;
	int stop_bundle;
	int retries;

	ifsd = ifs_get_data(dev);

	activate.data = 0;
	activate.delay = IFS_THREAD_WAIT;

	timeout = jiffies + 2 * HZ;
	retries = MAX_IFS_RETRIES;
	activate.bundle_idx = 0;
	stop_bundle = ifsd->max_bundle;

	while (activate.bundle_idx <= stop_bundle) {
		if (time_after(jiffies, timeout)) {
			status.error_code = IFS_SW_TIMEOUT;
			break;
		}

		atomic_set(&sbaf_cpus_in, 0);

		run_params.ifsd = ifsd;
		run_params.activate = &activate;
		run_params.retry_cnt = &retries;
		stop_core_cpuslocked(cpu, dosbaf, &run_params);

		status = run_params.status;

		if (sbaf_bundle_completed(status)) {
			activate.bundle_idx = status.bundle_idx + 1;
			activate.pgm_idx = 0;
			retries = MAX_IFS_RETRIES;
			continue;
		}

		/* Some cases can be retried, give up for others */
		if (!sbaf_can_restart(status))
			break;

		if (status.pgm_idx == activate.pgm_idx) {
			/* If no progress retry */
			if (--retries == 0) {
				if (status.error_code == IFS_NO_ERROR)
					status.error_code = IFS_SW_PARTIAL_COMPLETION;
				break;
			}
		} else {
			/* if some progress, more pgms remaining in bundle, reset retries */
			retries = MAX_IFS_RETRIES;
			activate.bundle_idx = status.bundle_idx;
			activate.pgm_idx = status.pgm_idx;
		}
	}

	/* Update status for this core */
	ifsd->scan_details = status.data;

	if (status.sbaf_status == SBAF_STATUS_SIGN_FAIL ||
	    status.sbaf_status == SBAF_STATUS_TEST_FAIL) {
		ifsd->status = SCAN_TEST_FAIL;
		sbaf_message_fail(dev, cpu, status);
	} else if (status.error_code || status.sbaf_status == SBAF_STATUS_INTR ||
		   (activate.bundle_idx < stop_bundle)) {
		ifsd->status = SCAN_NOT_TESTED;
		sbaf_message_not_tested(dev, cpu, status.data);
	} else {
		ifsd->status = SCAN_TEST_PASS;
	}
}

/*
 * Initiate per core test. It wakes up work queue threads on the target cpu and
 * its sibling cpu. Once all sibling threads wake up, the scan test gets executed and
 * wait for all sibling threads to finish the scan test.
 */
int do_core_test(int cpu, struct device *dev)
{
	const struct ifs_test_caps *test = ifs_get_test_caps(dev);
	struct ifs_data *ifsd = ifs_get_data(dev);
	int ret = 0;

	/* Prevent CPUs from being taken offline during the scan test */
	cpus_read_lock();

	if (!cpu_online(cpu)) {
		dev_info(dev, "cannot test on the offline cpu %d\n", cpu);
		ret = -EINVAL;
		goto out;
	}

	switch (test->test_num) {
	case IFS_TYPE_SAF:
		if (!ifsd->loaded)
			ret = -EPERM;
		else
			ifs_test_core(cpu, dev);
		break;
	case IFS_TYPE_ARRAY_BIST:
		if (ifsd->array_gen == ARRAY_GEN0)
			ifs_array_test_core(cpu, dev);
		else
			ifs_array_test_gen1(cpu, dev);
		break;
	case IFS_TYPE_SBAF:
		if (!ifsd->loaded)
			ret = -EPERM;
		else
			ifs_sbaf_test_core(cpu, dev);
		break;
	default:
		ret = -EINVAL;
	}
out:
	cpus_read_unlock();
	return ret;
}