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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* This header file defines data structures and operations related
* to NUMA proximity domains.
*/
#ifndef NUMA_H
#define NUMA_H
#include <types.h>
enum proximity_domain_type {
PD_TYPE_PROCESSOR,
/*
* The Generic Initiator concept is used in ACPI spec. A typical
* Generic Initiator domain is a CXL memory device.
*/
PD_TYPE_GENERIC_INITIATOR,
};
/*
* This proximity domain structure records all data related to
* a proximity doamin needed for following purpose:
* a. Device resource allocation. IIO stack involving CXL device
* needs to have different resource allocation method.
* b. e820 table setup. For example, CXL memory region may need to
* be set as soft reserved, since it is specific purpose memory.
* c. ACPI NUMA tables (SRAT, SLIT, HMAT).
*/
struct proximity_domain {
enum proximity_domain_type pd_type;
/*
* For processor domain, this holds the socket #.
* For generic initiator domain, this indicates to which socket the
* device is attached to. CXL 2.0 allows interleaving within and between
* sockets, so we need a bitmap.
*/
uint8_t socket_bitmap;
/* Relative distances (memory latency) from all domains */
uint8_t *distances;
/*
* Below fields are set to 0 for processor domains.
*/
struct device *dev;
uint32_t base; /* Memory region base address in the unit of 64MB */
uint32_t size; /* Memory region size in the unit of 64MB */
};
struct proximity_domains {
uint8_t num_pds;
struct proximity_domain *pds;
};
extern struct proximity_domains pds;
void dump_pds(void);
void fill_pds(void);
/*
* Return the total size of memory regions in generic initiator affinity
* domains. The size is in unit of 64MB.
*/
uint32_t get_generic_initiator_mem_size(void);
#endif /* NUMA_H */
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