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

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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: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/r/170319618721.2212653.5552947472849081786.stgit@djiang5-mobl3
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dave Jiang 2023-12-21 15:03:07 -07:00 committed by Dan Williams
parent a3a3e341f1
commit ca53543d8e
2 changed files with 52 additions and 0 deletions
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41
drivers/acpi/numa/hmat.c
View File

@ -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;

11
include/linux/acpi.h
View File

@ -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);