processor_throttling.c

来自「linux 内核源代码」· C语言 代码 · 共 927 行 · 第 1/2 页

static int acpi_read_throttling_status(struct acpi_processor *pr,
					acpi_integer *value)
{
	u32 bit_width, bit_offset;
	u64 ptc_value;
	u64 ptc_mask;
	struct acpi_processor_throttling *throttling;
	int ret = -1;

	throttling = &pr->throttling;
	switch (throttling->status_register.space_id) {
	case ACPI_ADR_SPACE_SYSTEM_IO:
		ptc_value = 0;
		bit_width = throttling->status_register.bit_width;
		bit_offset = throttling->status_register.bit_offset;

		acpi_os_read_port((acpi_io_address) throttling->status_register.
				  address, (u32 *) &ptc_value,
				  (u32) (bit_width + bit_offset));
		ptc_mask = (1 << bit_width) - 1;
		*value = (acpi_integer) ((ptc_value >> bit_offset) & ptc_mask);
		ret = 0;
		break;
	case ACPI_ADR_SPACE_FIXED_HARDWARE:
		ret = acpi_throttling_rdmsr(pr, value);
		break;
	default:
		printk(KERN_ERR PREFIX "Unknown addr space %d\n",
		       (u32) (throttling->status_register.space_id));
	}
	return ret;
}

static int acpi_write_throttling_state(struct acpi_processor *pr,
				acpi_integer value)
{
	u32 bit_width, bit_offset;
	u64 ptc_value;
	u64 ptc_mask;
	struct acpi_processor_throttling *throttling;
	int ret = -1;

	throttling = &pr->throttling;
	switch (throttling->control_register.space_id) {
	case ACPI_ADR_SPACE_SYSTEM_IO:
		bit_width = throttling->control_register.bit_width;
		bit_offset = throttling->control_register.bit_offset;
		ptc_mask = (1 << bit_width) - 1;
		ptc_value = value & ptc_mask;

		acpi_os_write_port((acpi_io_address) throttling->
					control_register.address,
					(u32) (ptc_value << bit_offset),
					(u32) (bit_width + bit_offset));
		ret = 0;
		break;
	case ACPI_ADR_SPACE_FIXED_HARDWARE:
		ret = acpi_throttling_wrmsr(pr, value);
		break;
	default:
		printk(KERN_ERR PREFIX "Unknown addr space %d\n",
		       (u32) (throttling->control_register.space_id));
	}
	return ret;
}

static int acpi_get_throttling_state(struct acpi_processor *pr,
				acpi_integer value)
{
	int i;

	for (i = 0; i < pr->throttling.state_count; i++) {
		struct acpi_processor_tx_tss *tx =
		    (struct acpi_processor_tx_tss *)&(pr->throttling.
						      states_tss[i]);
		if (tx->control == value)
			break;
	}
	if (i > pr->throttling.state_count)
		i = -1;
	return i;
}

static int acpi_get_throttling_value(struct acpi_processor *pr,
			int state, acpi_integer *value)
{
	int ret = -1;

	if (state >= 0 && state <= pr->throttling.state_count) {
		struct acpi_processor_tx_tss *tx =
		    (struct acpi_processor_tx_tss *)&(pr->throttling.
						      states_tss[state]);
		*value = tx->control;
		ret = 0;
	}
	return ret;
}

static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr)
{
	int state = 0;
	int ret;
	acpi_integer value;

	if (!pr)
		return -EINVAL;

	if (!pr->flags.throttling)
		return -ENODEV;

	pr->throttling.state = 0;

	value = 0;
	ret = acpi_read_throttling_status(pr, &value);
	if (ret >= 0) {
		state = acpi_get_throttling_state(pr, value);
		pr->throttling.state = state;
	}

	return 0;
}

static int acpi_processor_get_throttling(struct acpi_processor *pr)
{
	cpumask_t saved_mask;
	int ret;

	/*
	 * Migrate task to the cpu pointed by pr.
	 */
	saved_mask = current->cpus_allowed;
	set_cpus_allowed(current, cpumask_of_cpu(pr->id));
	ret = pr->throttling.acpi_processor_get_throttling(pr);
	/* restore the previous state */
	set_cpus_allowed(current, saved_mask);

	return ret;
}

static int acpi_processor_get_fadt_info(struct acpi_processor *pr)
{
	int i, step;

	if (!pr->throttling.address) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling register\n"));
		return -EINVAL;
	} else if (!pr->throttling.duty_width) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling states\n"));
		return -EINVAL;
	}
	/* TBD: Support duty_cycle values that span bit 4. */
	else if ((pr->throttling.duty_offset + pr->throttling.duty_width) > 4) {
		printk(KERN_WARNING PREFIX "duty_cycle spans bit 4\n");
		return -EINVAL;
	}

	pr->throttling.state_count = 1 << acpi_gbl_FADT.duty_width;

	/*
	 * Compute state values. Note that throttling displays a linear power
	 * performance relationship (at 50% performance the CPU will consume
	 * 50% power).  Values are in 1/10th of a percent to preserve accuracy.
	 */

	step = (1000 / pr->throttling.state_count);

	for (i = 0; i < pr->throttling.state_count; i++) {
		pr->throttling.states[i].performance = 1000 - step * i;
		pr->throttling.states[i].power = 1000 - step * i;
	}
	return 0;
}

static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr,
					      int state)
{
	u32 value = 0;
	u32 duty_mask = 0;
	u32 duty_value = 0;

	if (!pr)
		return -EINVAL;

	if ((state < 0) || (state > (pr->throttling.state_count - 1)))
		return -EINVAL;

	if (!pr->flags.throttling)
		return -ENODEV;

	if (state == pr->throttling.state)
		return 0;

	if (state < pr->throttling_platform_limit)
		return -EPERM;
	/*
	 * Calculate the duty_value and duty_mask.
	 */
	if (state) {
		duty_value = pr->throttling.state_count - state;

		duty_value <<= pr->throttling.duty_offset;

		/* Used to clear all duty_value bits */
		duty_mask = pr->throttling.state_count - 1;

		duty_mask <<= acpi_gbl_FADT.duty_offset;
		duty_mask = ~duty_mask;
	}

	local_irq_disable();

	/*
	 * Disable throttling by writing a 0 to bit 4.  Note that we must
	 * turn it off before you can change the duty_value.
	 */
	value = inl(pr->throttling.address);
	if (value & 0x10) {
		value &= 0xFFFFFFEF;
		outl(value, pr->throttling.address);
	}

	/*
	 * Write the new duty_value and then enable throttling.  Note
	 * that a state value of 0 leaves throttling disabled.
	 */
	if (state) {
		value &= duty_mask;
		value |= duty_value;
		outl(value, pr->throttling.address);

		value |= 0x00000010;
		outl(value, pr->throttling.address);
	}

	pr->throttling.state = state;

	local_irq_enable();

	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
			  "Throttling state set to T%d (%d%%)\n", state,
			  (pr->throttling.states[state].performance ? pr->
			   throttling.states[state].performance / 10 : 0)));

	return 0;
}

static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr,
					     int state)
{
	int ret;
	acpi_integer value;

	if (!pr)
		return -EINVAL;

	if ((state < 0) || (state > (pr->throttling.state_count - 1)))
		return -EINVAL;

	if (!pr->flags.throttling)
		return -ENODEV;

	if (state == pr->throttling.state)
		return 0;

	if (state < pr->throttling_platform_limit)
		return -EPERM;

	value = 0;
	ret = acpi_get_throttling_value(pr, state, &value);
	if (ret >= 0) {
		acpi_write_throttling_state(pr, value);
		pr->throttling.state = state;
	}

	return 0;
}

int acpi_processor_set_throttling(struct acpi_processor *pr, int state)
{
	cpumask_t saved_mask;
	int ret;
	/*
	 * Migrate task to the cpu pointed by pr.
	 */
	saved_mask = current->cpus_allowed;
	set_cpus_allowed(current, cpumask_of_cpu(pr->id));
	ret = pr->throttling.acpi_processor_set_throttling(pr, state);
	/* restore the previous state */
	set_cpus_allowed(current, saved_mask);
	return ret;
}

int acpi_processor_get_throttling_info(struct acpi_processor *pr)
{
	int result = 0;

	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
			  "pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n",
			  pr->throttling.address,
			  pr->throttling.duty_offset,
			  pr->throttling.duty_width));

	if (!pr)
		return -EINVAL;

	/*
	 * Evaluate _PTC, _TSS and _TPC
	 * They must all be present or none of them can be used.
	 */
	if (acpi_processor_get_throttling_control(pr) ||
		acpi_processor_get_throttling_states(pr) ||
		acpi_processor_get_platform_limit(pr))
	{
		pr->throttling.acpi_processor_get_throttling =
		    &acpi_processor_get_throttling_fadt;
		pr->throttling.acpi_processor_set_throttling =
		    &acpi_processor_set_throttling_fadt;
		if (acpi_processor_get_fadt_info(pr))
			return 0;
	} else {
		pr->throttling.acpi_processor_get_throttling =
		    &acpi_processor_get_throttling_ptc;
		pr->throttling.acpi_processor_set_throttling =
		    &acpi_processor_set_throttling_ptc;
	}

	acpi_processor_get_tsd(pr);

	/*
	 * PIIX4 Errata: We don't support throttling on the original PIIX4.
	 * This shouldn't be an issue as few (if any) mobile systems ever
	 * used this part.
	 */
	if (errata.piix4.throttle) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "Throttling not supported on PIIX4 A- or B-step\n"));
		return 0;
	}

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n",
			  pr->throttling.state_count));

	pr->flags.throttling = 1;

	/*
	 * Disable throttling (if enabled).  We'll let subsequent policy (e.g.
	 * thermal) decide to lower performance if it so chooses, but for now
	 * we'll crank up the speed.
	 */

	result = acpi_processor_get_throttling(pr);
	if (result)
		goto end;

	if (pr->throttling.state) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "Disabling throttling (was T%d)\n",
				  pr->throttling.state));
		result = acpi_processor_set_throttling(pr, 0);
		if (result)
			goto end;
	}

      end:
	if (result)
		pr->flags.throttling = 0;

	return result;
}

/* proc interface */

static int acpi_processor_throttling_seq_show(struct seq_file *seq,
					      void *offset)
{
	struct acpi_processor *pr = seq->private;
	int i = 0;
	int result = 0;

	if (!pr)
		goto end;

	if (!(pr->throttling.state_count > 0)) {
		seq_puts(seq, "<not supported>\n");
		goto end;
	}

	result = acpi_processor_get_throttling(pr);

	if (result) {
		seq_puts(seq,
			 "Could not determine current throttling state.\n");
		goto end;
	}

	seq_printf(seq, "state count:             %d\n"
		   "active state:            T%d\n"
		   "state available: T%d to T%d\n",
		   pr->throttling.state_count, pr->throttling.state,
		   pr->throttling_platform_limit,
		   pr->throttling.state_count - 1);

	seq_puts(seq, "states:\n");
	if (pr->throttling.acpi_processor_get_throttling ==
			acpi_processor_get_throttling_fadt) {
		for (i = 0; i < pr->throttling.state_count; i++)
			seq_printf(seq, "   %cT%d:                  %02d%%\n",
				   (i == pr->throttling.state ? '*' : ' '), i,
				   (pr->throttling.states[i].performance ? pr->
				    throttling.states[i].performance / 10 : 0));
	} else {
		for (i = 0; i < pr->throttling.state_count; i++)
			seq_printf(seq, "   %cT%d:                  %02d%%\n",
				   (i == pr->throttling.state ? '*' : ' '), i,
				   (int)pr->throttling.states_tss[i].
				   freqpercentage);
	}

      end:
	return 0;
}

static int acpi_processor_throttling_open_fs(struct inode *inode,
					     struct file *file)
{
	return single_open(file, acpi_processor_throttling_seq_show,
			   PDE(inode)->data);
}

static ssize_t acpi_processor_write_throttling(struct file *file,
					       const char __user * buffer,
					       size_t count, loff_t * data)
{
	int result = 0;
	struct seq_file *m = file->private_data;
	struct acpi_processor *pr = m->private;
	char state_string[12] = { '\0' };

	if (!pr || (count > sizeof(state_string) - 1))
		return -EINVAL;

	if (copy_from_user(state_string, buffer, count))
		return -EFAULT;

	state_string[count] = '\0';

	result = acpi_processor_set_throttling(pr,
					       simple_strtoul(state_string,
							      NULL, 0));
	if (result)
		return result;

	return count;
}

struct file_operations acpi_processor_throttling_fops = {
	.open = acpi_processor_throttling_open_fs,
	.read = seq_read,
	.write = acpi_processor_write_throttling,
	.llseek = seq_lseek,
	.release = single_release,
};