Commit 62839e2d authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

Merge branch 'acpi-processor' 

* acpi-processor:
  ACPI / CPPC: Fix potential memory leak
  ACPI / CPPC: signedness bug in register_pcc_channel()
  ACPI: Allow selection of the ACPI processor driver for ARM64
  CPPC: Probe for CPPC tables for each ACPI Processor object
  ACPI: Add weak routines for ACPI CPU Hotplug
  ACPI / CPPC: Add a CPUFreq driver for use with CPPC
  ACPI: Introduce CPU performance controls using CPPC
parents 5b9ddd0d 4219853a

drivers/acpi/Kconfig

+17 −3
Original line number Diff line number Diff line
@@ -206,11 +206,25 @@ config ACPI_PROCESSOR_IDLE 
	bool

	select CPU_IDLE



config ACPI_CPPC_LIB

	bool

	depends on ACPI_PROCESSOR

	depends on !ACPI_CPU_FREQ_PSS

	select MAILBOX

	select PCC

	help

	  If this option is enabled, this file implements common functionality

	  to parse CPPC tables as described in the ACPI 5.1+ spec. The

	  routines implemented are meant to be used by other

	  drivers to control CPU performance using CPPC semantics.

	  If your platform does not support CPPC in firmware,

	  leave this option disabled.



config ACPI_PROCESSOR

	tristate "Processor"

	depends on X86 || IA64

	select ACPI_PROCESSOR_IDLE

	select ACPI_CPU_FREQ_PSS

	depends on X86 || IA64 || ARM64

	select ACPI_PROCESSOR_IDLE if X86 || IA64

	select ACPI_CPU_FREQ_PSS if X86 || IA64

	default y

	help

	  This driver adds support for the ACPI Processor package. It is required

drivers/acpi/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -78,6 +78,7 @@ obj-$(CONFIG_ACPI_HED) += hed.o 
obj-$(CONFIG_ACPI_EC_DEBUGFS)	+= ec_sys.o

obj-$(CONFIG_ACPI_CUSTOM_METHOD)+= custom_method.o

obj-$(CONFIG_ACPI_BGRT)		+= bgrt.o

obj-$(CONFIG_ACPI_CPPC_LIB)	+= cppc_acpi.o



# processor has its own "processor." module_param namespace

processor-y			:= processor_driver.o

drivers/acpi/acpi_processor.c

+18 −0
Original line number Diff line number Diff line
@@ -164,6 +164,24 @@ static int acpi_processor_errata(void) 
   -------------------------------------------------------------------------- */



#ifdef CONFIG_ACPI_HOTPLUG_CPU

int __weak acpi_map_cpu(acpi_handle handle,

		phys_cpuid_t physid, int *pcpu)

{

	return -ENODEV;

}



int __weak acpi_unmap_cpu(int cpu)

{

	return -ENODEV;

}



int __weak arch_register_cpu(int cpu)

{

	return -ENODEV;

}



void __weak arch_unregister_cpu(int cpu) {}



static int acpi_processor_hotadd_init(struct acpi_processor *pr)

{

	unsigned long long sta;

drivers/acpi/cppc_acpi.c

0 → 100644
+733 −0
Original line number Diff line number Diff line 
/*

 * CPPC (Collaborative Processor Performance Control) methods used by CPUfreq drivers.

 *

 * (C) Copyright 2014, 2015 Linaro Ltd.

 * Author: Ashwin Chaugule <ashwin.chaugule@linaro.org>

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; version 2

 * of the License.

 *

 * CPPC describes a few methods for controlling CPU performance using

 * information from a per CPU table called CPC. This table is described in

 * the ACPI v5.0+ specification. The table consists of a list of

 * registers which may be memory mapped or hardware registers and also may

 * include some static integer values.

 *

 * CPU performance is on an abstract continuous scale as against a discretized

 * P-state scale which is tied to CPU frequency only. In brief, the basic

 * operation involves:

 *

 * - OS makes a CPU performance request. (Can provide min and max bounds)

 *

 * - Platform (such as BMC) is free to optimize request within requested bounds

 *   depending on power/thermal budgets etc.

 *

 * - Platform conveys its decision back to OS

 *

 * The communication between OS and platform occurs through another medium

 * called (PCC) Platform Communication Channel. This is a generic mailbox like

 * mechanism which includes doorbell semantics to indicate register updates.

 * See drivers/mailbox/pcc.c for details on PCC.

 *

 * Finer details about the PCC and CPPC spec are available in the ACPI v5.1 and

 * above specifications.

 */



#define pr_fmt(fmt)	"ACPI CPPC: " fmt



#include <linux/cpufreq.h>

#include <linux/delay.h>



#include <acpi/cppc_acpi.h>

/*

 * Lock to provide mutually exclusive access to the PCC

 * channel. e.g. When the remote updates the shared region

 * with new data, the reader needs to be protected from

 * other CPUs activity on the same channel.

 */

static DEFINE_SPINLOCK(pcc_lock);



/*

 * The cpc_desc structure contains the ACPI register details

 * as described in the per CPU _CPC tables. The details

 * include the type of register (e.g. PCC, System IO, FFH etc.)

 * and destination addresses which lets us READ/WRITE CPU performance

 * information using the appropriate I/O methods.

 */

static DEFINE_PER_CPU(struct cpc_desc *, cpc_desc_ptr);



/* This layer handles all the PCC specifics for CPPC. */

static struct mbox_chan *pcc_channel;

static void __iomem *pcc_comm_addr;

static u64 comm_base_addr;

static int pcc_subspace_idx = -1;

static u16 pcc_cmd_delay;

static bool pcc_channel_acquired;



/*

 * Arbitrary Retries in case the remote processor is slow to respond

 * to PCC commands.

 */

#define NUM_RETRIES 500



static int send_pcc_cmd(u16 cmd)

{

	int retries, result = -EIO;

	struct acpi_pcct_hw_reduced *pcct_ss = pcc_channel->con_priv;

	struct acpi_pcct_shared_memory *generic_comm_base =

		(struct acpi_pcct_shared_memory *) pcc_comm_addr;

	u32 cmd_latency = pcct_ss->latency;



	/* Min time OS should wait before sending next command. */

	udelay(pcc_cmd_delay);



	/* Write to the shared comm region. */

	writew(cmd, &generic_comm_base->command);



	/* Flip CMD COMPLETE bit */

	writew(0, &generic_comm_base->status);



	/* Ring doorbell */

	result = mbox_send_message(pcc_channel, &cmd);

	if (result < 0) {

		pr_err("Err sending PCC mbox message. cmd:%d, ret:%d\n",

				cmd, result);

		return result;

	}



	/* Wait for a nominal time to let platform process command. */

	udelay(cmd_latency);



	/* Retry in case the remote processor was too slow to catch up. */

	for (retries = NUM_RETRIES; retries > 0; retries--) {

		if (readw_relaxed(&generic_comm_base->status) & PCC_CMD_COMPLETE) {

			result = 0;

			break;

		}

	}



	mbox_client_txdone(pcc_channel, result);

	return result;

}



static void cppc_chan_tx_done(struct mbox_client *cl, void *msg, int ret)

{

	if (ret)

		pr_debug("TX did not complete: CMD sent:%x, ret:%d\n",

				*(u16 *)msg, ret);

	else

		pr_debug("TX completed. CMD sent:%x, ret:%d\n",

				*(u16 *)msg, ret);

}



struct mbox_client cppc_mbox_cl = {

	.tx_done = cppc_chan_tx_done,

	.knows_txdone = true,

};



static int acpi_get_psd(struct cpc_desc *cpc_ptr, acpi_handle handle)

{

	int result = -EFAULT;

	acpi_status status = AE_OK;

	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};

	struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};

	struct acpi_buffer state = {0, NULL};

	union acpi_object  *psd = NULL;

	struct acpi_psd_package *pdomain;



	status = acpi_evaluate_object_typed(handle, "_PSD", NULL, &buffer,

			ACPI_TYPE_PACKAGE);

	if (ACPI_FAILURE(status))

		return -ENODEV;



	psd = buffer.pointer;

	if (!psd || psd->package.count != 1) {

		pr_debug("Invalid _PSD data\n");

		goto end;

	}



	pdomain = &(cpc_ptr->domain_info);



	state.length = sizeof(struct acpi_psd_package);

	state.pointer = pdomain;



	status = acpi_extract_package(&(psd->package.elements[0]),

		&format, &state);

	if (ACPI_FAILURE(status)) {

		pr_debug("Invalid _PSD data for CPU:%d\n", cpc_ptr->cpu_id);

		goto end;

	}



	if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {

		pr_debug("Unknown _PSD:num_entries for CPU:%d\n", cpc_ptr->cpu_id);

		goto end;

	}



	if (pdomain->revision != ACPI_PSD_REV0_REVISION) {

		pr_debug("Unknown _PSD:revision for CPU: %d\n", cpc_ptr->cpu_id);

		goto end;

	}



	if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&

	    pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&

	    pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {

		pr_debug("Invalid _PSD:coord_type for CPU:%d\n", cpc_ptr->cpu_id);

		goto end;

	}



	result = 0;

end:

	kfree(buffer.pointer);

	return result;

}



/**

 * acpi_get_psd_map - Map the CPUs in a common freq domain.

 * @all_cpu_data: Ptrs to CPU specific CPPC data including PSD info.

 *

 *	Return: 0 for success or negative value for err.

 */

int acpi_get_psd_map(struct cpudata **all_cpu_data)

{

	int count_target;

	int retval = 0;

	unsigned int i, j;

	cpumask_var_t covered_cpus;

	struct cpudata *pr, *match_pr;

	struct acpi_psd_package *pdomain;

	struct acpi_psd_package *match_pdomain;

	struct cpc_desc *cpc_ptr, *match_cpc_ptr;



	if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))

		return -ENOMEM;



	/*

	 * Now that we have _PSD data from all CPUs, lets setup P-state

	 * domain info.

	 */

	for_each_possible_cpu(i) {

		pr = all_cpu_data[i];

		if (!pr)

			continue;



		if (cpumask_test_cpu(i, covered_cpus))

			continue;



		cpc_ptr = per_cpu(cpc_desc_ptr, i);

		if (!cpc_ptr)

			continue;



		pdomain = &(cpc_ptr->domain_info);

		cpumask_set_cpu(i, pr->shared_cpu_map);

		cpumask_set_cpu(i, covered_cpus);

		if (pdomain->num_processors <= 1)

			continue;



		/* Validate the Domain info */

		count_target = pdomain->num_processors;

		if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)

			pr->shared_type = CPUFREQ_SHARED_TYPE_ALL;

		else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)

			pr->shared_type = CPUFREQ_SHARED_TYPE_HW;

		else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)

			pr->shared_type = CPUFREQ_SHARED_TYPE_ANY;



		for_each_possible_cpu(j) {

			if (i == j)

				continue;



			match_cpc_ptr = per_cpu(cpc_desc_ptr, j);

			if (!match_cpc_ptr)

				continue;



			match_pdomain = &(match_cpc_ptr->domain_info);

			if (match_pdomain->domain != pdomain->domain)

				continue;



			/* Here i and j are in the same domain */

			if (match_pdomain->num_processors != count_target) {

				retval = -EFAULT;

				goto err_ret;

			}



			if (pdomain->coord_type != match_pdomain->coord_type) {

				retval = -EFAULT;

				goto err_ret;

			}



			cpumask_set_cpu(j, covered_cpus);

			cpumask_set_cpu(j, pr->shared_cpu_map);

		}



		for_each_possible_cpu(j) {

			if (i == j)

				continue;



			match_pr = all_cpu_data[j];

			if (!match_pr)

				continue;



			match_cpc_ptr = per_cpu(cpc_desc_ptr, j);

			if (!match_cpc_ptr)

				continue;



			match_pdomain = &(match_cpc_ptr->domain_info);

			if (match_pdomain->domain != pdomain->domain)

				continue;



			match_pr->shared_type = pr->shared_type;

			cpumask_copy(match_pr->shared_cpu_map,

				     pr->shared_cpu_map);

		}

	}



err_ret:

	for_each_possible_cpu(i) {

		pr = all_cpu_data[i];

		if (!pr)

			continue;



		/* Assume no coordination on any error parsing domain info */

		if (retval) {

			cpumask_clear(pr->shared_cpu_map);

			cpumask_set_cpu(i, pr->shared_cpu_map);

			pr->shared_type = CPUFREQ_SHARED_TYPE_ALL;

		}

	}



	free_cpumask_var(covered_cpus);

	return retval;

}

EXPORT_SYMBOL_GPL(acpi_get_psd_map);



static int register_pcc_channel(int pcc_subspace_idx)

{

	struct acpi_pcct_subspace *cppc_ss;

	unsigned int len;



	if (pcc_subspace_idx >= 0) {

		pcc_channel = pcc_mbox_request_channel(&cppc_mbox_cl,

				pcc_subspace_idx);



		if (IS_ERR(pcc_channel)) {

			pr_err("Failed to find PCC communication channel\n");

			return -ENODEV;

		}



		/*

		 * The PCC mailbox controller driver should

		 * have parsed the PCCT (global table of all

		 * PCC channels) and stored pointers to the

		 * subspace communication region in con_priv.

		 */

		cppc_ss = pcc_channel->con_priv;



		if (!cppc_ss) {

			pr_err("No PCC subspace found for CPPC\n");

			return -ENODEV;

		}



		/*

		 * This is the shared communication region

		 * for the OS and Platform to communicate over.

		 */

		comm_base_addr = cppc_ss->base_address;

		len = cppc_ss->length;

		pcc_cmd_delay = cppc_ss->min_turnaround_time;



		pcc_comm_addr = acpi_os_ioremap(comm_base_addr, len);

		if (!pcc_comm_addr) {

			pr_err("Failed to ioremap PCC comm region mem\n");

			return -ENOMEM;

		}



		/* Set flag so that we dont come here for each CPU. */

		pcc_channel_acquired = true;

	}



	return 0;

}



/*

 * An example CPC table looks like the following.

 *

 *	Name(_CPC, Package()

 *			{

 *			17,

 *			NumEntries

 *			1,

 *			// Revision

 *			ResourceTemplate(){Register(PCC, 32, 0, 0x120, 2)},

 *			// Highest Performance

 *			ResourceTemplate(){Register(PCC, 32, 0, 0x124, 2)},

 *			// Nominal Performance

 *			ResourceTemplate(){Register(PCC, 32, 0, 0x128, 2)},

 *			// Lowest Nonlinear Performance

 *			ResourceTemplate(){Register(PCC, 32, 0, 0x12C, 2)},

 *			// Lowest Performance

 *			ResourceTemplate(){Register(PCC, 32, 0, 0x130, 2)},

 *			// Guaranteed Performance Register

 *			ResourceTemplate(){Register(PCC, 32, 0, 0x110, 2)},

 *			// Desired Performance Register

 *			ResourceTemplate(){Register(SystemMemory, 0, 0, 0, 0)},

 *			..

 *			..

 *			..

 *

 *		}

 * Each Register() encodes how to access that specific register.

 * e.g. a sample PCC entry has the following encoding:

 *

 *	Register (

 *		PCC,

 *		AddressSpaceKeyword

 *		8,

 *		//RegisterBitWidth

 *		8,

 *		//RegisterBitOffset

 *		0x30,

 *		//RegisterAddress

 *		9

 *		//AccessSize (subspace ID)

 *		0

 *		)

 *	}

 */



/**

 * acpi_cppc_processor_probe - Search for per CPU _CPC objects.

 * @pr: Ptr to acpi_processor containing this CPUs logical Id.

 *

 *	Return: 0 for success or negative value for err.

 */

int acpi_cppc_processor_probe(struct acpi_processor *pr)

{

	struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};

	union acpi_object *out_obj, *cpc_obj;

	struct cpc_desc *cpc_ptr;

	struct cpc_reg *gas_t;

	acpi_handle handle = pr->handle;

	unsigned int num_ent, i, cpc_rev;

	acpi_status status;

	int ret = -EFAULT;



	/* Parse the ACPI _CPC table for this cpu. */

	status = acpi_evaluate_object_typed(handle, "_CPC", NULL, &output,

			ACPI_TYPE_PACKAGE);

	if (ACPI_FAILURE(status)) {

		ret = -ENODEV;

		goto out_buf_free;

	}



	out_obj = (union acpi_object *) output.pointer;



	cpc_ptr = kzalloc(sizeof(struct cpc_desc), GFP_KERNEL);

	if (!cpc_ptr) {

		ret = -ENOMEM;

		goto out_buf_free;

	}



	/* First entry is NumEntries. */

	cpc_obj = &out_obj->package.elements[0];

	if (cpc_obj->type == ACPI_TYPE_INTEGER)	{

		num_ent = cpc_obj->integer.value;

	} else {

		pr_debug("Unexpected entry type(%d) for NumEntries\n",

				cpc_obj->type);

		goto out_free;

	}



	/* Only support CPPCv2. Bail otherwise. */

	if (num_ent != CPPC_NUM_ENT) {

		pr_debug("Firmware exports %d entries. Expected: %d\n",

				num_ent, CPPC_NUM_ENT);

		goto out_free;

	}



	/* Second entry should be revision. */

	cpc_obj = &out_obj->package.elements[1];

	if (cpc_obj->type == ACPI_TYPE_INTEGER)	{

		cpc_rev = cpc_obj->integer.value;

	} else {

		pr_debug("Unexpected entry type(%d) for Revision\n",

				cpc_obj->type);

		goto out_free;

	}



	if (cpc_rev != CPPC_REV) {

		pr_debug("Firmware exports revision:%d. Expected:%d\n",

				cpc_rev, CPPC_REV);

		goto out_free;

	}



	/* Iterate through remaining entries in _CPC */

	for (i = 2; i < num_ent; i++) {

		cpc_obj = &out_obj->package.elements[i];



		if (cpc_obj->type == ACPI_TYPE_INTEGER)	{

			cpc_ptr->cpc_regs[i-2].type = ACPI_TYPE_INTEGER;

			cpc_ptr->cpc_regs[i-2].cpc_entry.int_value = cpc_obj->integer.value;

		} else if (cpc_obj->type == ACPI_TYPE_BUFFER) {

			gas_t = (struct cpc_reg *)

				cpc_obj->buffer.pointer;



			/*

			 * The PCC Subspace index is encoded inside

			 * the CPC table entries. The same PCC index

			 * will be used for all the PCC entries,

			 * so extract it only once.

			 */

			if (gas_t->space_id == ACPI_ADR_SPACE_PLATFORM_COMM) {

				if (pcc_subspace_idx < 0)

					pcc_subspace_idx = gas_t->access_width;

				else if (pcc_subspace_idx != gas_t->access_width) {

					pr_debug("Mismatched PCC ids.\n");

					goto out_free;

				}

			} else if (gas_t->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) {

				/* Support only PCC and SYS MEM type regs */

				pr_debug("Unsupported register type: %d\n", gas_t->space_id);

				goto out_free;

			}



			cpc_ptr->cpc_regs[i-2].type = ACPI_TYPE_BUFFER;

			memcpy(&cpc_ptr->cpc_regs[i-2].cpc_entry.reg, gas_t, sizeof(*gas_t));

		} else {

			pr_debug("Err in entry:%d in CPC table of CPU:%d \n", i, pr->id);

			goto out_free;

		}

	}

	/* Store CPU Logical ID */

	cpc_ptr->cpu_id = pr->id;



	/* Plug it into this CPUs CPC descriptor. */

	per_cpu(cpc_desc_ptr, pr->id) = cpc_ptr;



	/* Parse PSD data for this CPU */

	ret = acpi_get_psd(cpc_ptr, handle);

	if (ret)

		goto out_free;



	/* Register PCC channel once for all CPUs. */

	if (!pcc_channel_acquired) {

		ret = register_pcc_channel(pcc_subspace_idx);

		if (ret)

			goto out_free;

	}



	/* Everything looks okay */

	pr_debug("Parsed CPC struct for CPU: %d\n", pr->id);



	kfree(output.pointer);

	return 0;



out_free:

	kfree(cpc_ptr);



out_buf_free:

	kfree(output.pointer);

	return ret;

}

EXPORT_SYMBOL_GPL(acpi_cppc_processor_probe);



/**

 * acpi_cppc_processor_exit - Cleanup CPC structs.

 * @pr: Ptr to acpi_processor containing this CPUs logical Id.

 *

 * Return: Void

 */

void acpi_cppc_processor_exit(struct acpi_processor *pr)

{

	struct cpc_desc *cpc_ptr;

	cpc_ptr = per_cpu(cpc_desc_ptr, pr->id);

	kfree(cpc_ptr);

}

EXPORT_SYMBOL_GPL(acpi_cppc_processor_exit);



static u64 get_phys_addr(struct cpc_reg *reg)

{

	/* PCC communication addr space begins at byte offset 0x8. */

	if (reg->space_id == ACPI_ADR_SPACE_PLATFORM_COMM)

		return (u64)comm_base_addr + 0x8 + reg->address;

	else

		return reg->address;

}



static void cpc_read(struct cpc_reg *reg, u64 *val)

{

	u64 addr = get_phys_addr(reg);



	acpi_os_read_memory((acpi_physical_address)addr,

			val, reg->bit_width);

}



static void cpc_write(struct cpc_reg *reg, u64 val)

{

	u64 addr = get_phys_addr(reg);



	acpi_os_write_memory((acpi_physical_address)addr,

			val, reg->bit_width);

}



/**

 * cppc_get_perf_caps - Get a CPUs performance capabilities.

 * @cpunum: CPU from which to get capabilities info.

 * @perf_caps: ptr to cppc_perf_caps. See cppc_acpi.h

 *

 * Return: 0 for success with perf_caps populated else -ERRNO.

 */

int cppc_get_perf_caps(int cpunum, struct cppc_perf_caps *perf_caps)

{

	struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpunum);

	struct cpc_register_resource *highest_reg, *lowest_reg, *ref_perf,

								 *nom_perf;

	u64 high, low, ref, nom;

	int ret = 0;



	if (!cpc_desc) {

		pr_debug("No CPC descriptor for CPU:%d\n", cpunum);

		return -ENODEV;

	}



	highest_reg = &cpc_desc->cpc_regs[HIGHEST_PERF];

	lowest_reg = &cpc_desc->cpc_regs[LOWEST_PERF];

	ref_perf = &cpc_desc->cpc_regs[REFERENCE_PERF];

	nom_perf = &cpc_desc->cpc_regs[NOMINAL_PERF];



	spin_lock(&pcc_lock);



	/* Are any of the regs PCC ?*/

	if ((highest_reg->cpc_entry.reg.space_id == ACPI_ADR_SPACE_PLATFORM_COMM) ||

			(lowest_reg->cpc_entry.reg.space_id == ACPI_ADR_SPACE_PLATFORM_COMM) ||

			(ref_perf->cpc_entry.reg.space_id == ACPI_ADR_SPACE_PLATFORM_COMM) ||

			(nom_perf->cpc_entry.reg.space_id == ACPI_ADR_SPACE_PLATFORM_COMM)) {

		/* Ring doorbell once to update PCC subspace */

		if (send_pcc_cmd(CMD_READ)) {

			ret = -EIO;

			goto out_err;

		}

	}



	cpc_read(&highest_reg->cpc_entry.reg, &high);

	perf_caps->highest_perf = high;



	cpc_read(&lowest_reg->cpc_entry.reg, &low);

	perf_caps->lowest_perf = low;



	cpc_read(&ref_perf->cpc_entry.reg, &ref);

	perf_caps->reference_perf = ref;



	cpc_read(&nom_perf->cpc_entry.reg, &nom);

	perf_caps->nominal_perf = nom;



	if (!ref)

		perf_caps->reference_perf = perf_caps->nominal_perf;



	if (!high || !low || !nom)

		ret = -EFAULT;



out_err:

	spin_unlock(&pcc_lock);

	return ret;

}

EXPORT_SYMBOL_GPL(cppc_get_perf_caps);



/**

 * cppc_get_perf_ctrs - Read a CPUs performance feedback counters.

 * @cpunum: CPU from which to read counters.

 * @perf_fb_ctrs: ptr to cppc_perf_fb_ctrs. See cppc_acpi.h

 *

 * Return: 0 for success with perf_fb_ctrs populated else -ERRNO.

 */

int cppc_get_perf_ctrs(int cpunum, struct cppc_perf_fb_ctrs *perf_fb_ctrs)

{

	struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpunum);

	struct cpc_register_resource *delivered_reg, *reference_reg;

	u64 delivered, reference;

	int ret = 0;



	if (!cpc_desc) {

		pr_debug("No CPC descriptor for CPU:%d\n", cpunum);

		return -ENODEV;

	}



	delivered_reg = &cpc_desc->cpc_regs[DELIVERED_CTR];

	reference_reg = &cpc_desc->cpc_regs[REFERENCE_CTR];



	spin_lock(&pcc_lock);



	/* Are any of the regs PCC ?*/

	if ((delivered_reg->cpc_entry.reg.space_id == ACPI_ADR_SPACE_PLATFORM_COMM) ||

			(reference_reg->cpc_entry.reg.space_id == ACPI_ADR_SPACE_PLATFORM_COMM)) {

		/* Ring doorbell once to update PCC subspace */

		if (send_pcc_cmd(CMD_READ)) {

			ret = -EIO;

			goto out_err;

		}

	}



	cpc_read(&delivered_reg->cpc_entry.reg, &delivered);

	cpc_read(&reference_reg->cpc_entry.reg, &reference);



	if (!delivered || !reference) {

		ret = -EFAULT;

		goto out_err;

	}



	perf_fb_ctrs->delivered = delivered;

	perf_fb_ctrs->reference = reference;



	perf_fb_ctrs->delivered -= perf_fb_ctrs->prev_delivered;

	perf_fb_ctrs->reference -= perf_fb_ctrs->prev_reference;



	perf_fb_ctrs->prev_delivered = delivered;

	perf_fb_ctrs->prev_reference = reference;



out_err:

	spin_unlock(&pcc_lock);

	return ret;

}

EXPORT_SYMBOL_GPL(cppc_get_perf_ctrs);



/**

 * cppc_set_perf - Set a CPUs performance controls.

 * @cpu: CPU for which to set performance controls.

 * @perf_ctrls: ptr to cppc_perf_ctrls. See cppc_acpi.h

 *

 * Return: 0 for success, -ERRNO otherwise.

 */

int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls)

{

	struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpu);

	struct cpc_register_resource *desired_reg;

	int ret = 0;



	if (!cpc_desc) {

		pr_debug("No CPC descriptor for CPU:%d\n", cpu);

		return -ENODEV;

	}



	desired_reg = &cpc_desc->cpc_regs[DESIRED_PERF];



	spin_lock(&pcc_lock);



	/*

	 * Skip writing MIN/MAX until Linux knows how to come up with

	 * useful values.

	 */

	cpc_write(&desired_reg->cpc_entry.reg, perf_ctrls->desired_perf);



	/* Is this a PCC reg ?*/

	if (desired_reg->cpc_entry.reg.space_id == ACPI_ADR_SPACE_PLATFORM_COMM) {

		/* Ring doorbell so Remote can get our perf request. */

		if (send_pcc_cmd(CMD_WRITE))

			ret = -EIO;

	}



	spin_unlock(&pcc_lock);



	return ret;

}

EXPORT_SYMBOL_GPL(cppc_set_perf);

drivers/acpi/processor_driver.c

+6 −0
Original line number Diff line number Diff line
@@ -242,6 +242,10 @@ static int __acpi_processor_start(struct acpi_device *device) 
	if (pr->flags.need_hotplug_init)

		return 0;



	result = acpi_cppc_processor_probe(pr);

	if (result)

		return -ENODEV;



	if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver)

		acpi_processor_power_init(pr);
@@ -287,6 +291,8 @@ static int acpi_processor_stop(struct device *dev) 


	acpi_pss_perf_exit(pr, device);



	acpi_cppc_processor_exit(pr);



	return 0;

}

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