Commit ca53543d authored by Dave Jiang's avatar Dave Jiang Committed by Dan Williams
Browse files

acpi: numa: Add helper function to retrieve the performance attributes 



Add helper to retrieve the performance attributes based on the device
handle.  The helper function is exported so the CXL driver can use that
to acquire the performance data between the CPU and the CXL host bridge.

Reviewed-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: default avatarDave Jiang <dave.jiang@intel.com>
Acked-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/r/170319618721.2212653.5552947472849081786.stgit@djiang5-mobl3


Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent a3a3e341

drivers/acpi/numa/hmat.c

+41 −0
Original line number Diff line number Diff line
@@ -108,6 +108,47 @@ static struct memory_target *find_mem_target(unsigned int mem_pxm) 
	return NULL;

}



static struct memory_target *acpi_find_genport_target(u32 uid)

{

	struct memory_target *target;

	u32 target_uid;

	u8 *uid_ptr;



	list_for_each_entry(target, &targets, node) {

		uid_ptr = target->gen_port_device_handle + 8;

		target_uid = *(u32 *)uid_ptr;

		if (uid == target_uid)

			return target;

	}



	return NULL;

}



/**

 * acpi_get_genport_coordinates - Retrieve the access coordinates for a generic port

 * @uid: ACPI unique id

 * @coord: The access coordinates written back out for the generic port

 *

 * Return: 0 on success. Errno on failure.

 *

 * Only supports device handles that are ACPI. Assume ACPI0016 HID for CXL.

 */

int acpi_get_genport_coordinates(u32 uid,

				 struct access_coordinate *coord)

{

	struct memory_target *target;



	guard(mutex)(&target_lock);

	target = acpi_find_genport_target(uid);

	if (!target)

		return -ENOENT;



	*coord = target->coord[NODE_ACCESS_CLASS_GENPORT_SINK];



	return 0;

}

EXPORT_SYMBOL_NS_GPL(acpi_get_genport_coordinates, CXL);



static __init void alloc_memory_initiator(unsigned int cpu_pxm)

{

	struct memory_initiator *initiator;

include/linux/acpi.h

+11 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
#include <linux/mod_devicetable.h>

#include <linux/property.h>

#include <linux/uuid.h>

#include <linux/node.h>



struct irq_domain;

struct irq_domain_ops;
@@ -424,6 +425,16 @@ extern int acpi_blacklisted(void); 
extern void acpi_osi_setup(char *str);

extern bool acpi_osi_is_win8(void);



#ifdef CONFIG_ACPI_HMAT

int acpi_get_genport_coordinates(u32 uid, struct access_coordinate *coord);

#else

static inline int acpi_get_genport_coordinates(u32 uid,

					       struct access_coordinate *coord)

{

	return -EOPNOTSUPP;

}

#endif



#ifdef CONFIG_ACPI_NUMA

int acpi_map_pxm_to_node(int pxm);

int acpi_get_node(acpi_handle handle);