mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-24 23:23:24 +07:00
5d30f92e76
The DEV_DAX_KMEM facility is a generic mechanism to allow device-dax instances, fronting performance-differentiated-memory like pmem, to be added to the System RAM pool. The NUMA node for that hot-added memory is derived from the device-dax instance's 'target_node' attribute. Recall that the 'target_node' is the ACPI-PXM-to-node translation for memory when it comes online whereas the 'numa_node' attribute of the device represents the closest online cpu node. Presently useful target_node information from the ACPI SRAT is discarded with the expectation that "Reserved" memory will never be onlined. Now, DEV_DAX_KMEM violates that assumption, there is a need to retain the translation. Move, rather than discard, numa_memblk data to a secondary array that memory_add_physaddr_to_target_node() may consider at a later point in time. Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Borislav Petkov <bp@alien8.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: <x86@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: David Hildenbrand <david@redhat.com> Cc: Michal Hocko <mhocko@suse.com> Reported-by: kbuild test robot <lkp@intel.com> Reviewed-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/r/158188326978.894464.217282995221175417.stgit@dwillia2-desk3.amr.corp.intel.com
45 lines
900 B
C
45 lines
900 B
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_NUMA_H
|
|
#define _LINUX_NUMA_H
|
|
#include <linux/types.h>
|
|
|
|
#ifdef CONFIG_NODES_SHIFT
|
|
#define NODES_SHIFT CONFIG_NODES_SHIFT
|
|
#else
|
|
#define NODES_SHIFT 0
|
|
#endif
|
|
|
|
#define MAX_NUMNODES (1 << NODES_SHIFT)
|
|
|
|
#define NUMA_NO_NODE (-1)
|
|
|
|
/* optionally keep NUMA memory info available post init */
|
|
#ifdef CONFIG_NUMA_KEEP_MEMINFO
|
|
#define __initdata_or_meminfo
|
|
#else
|
|
#define __initdata_or_meminfo __initdata
|
|
#endif
|
|
|
|
#ifdef CONFIG_NUMA
|
|
/* Generic implementation available */
|
|
int numa_map_to_online_node(int node);
|
|
|
|
/*
|
|
* Optional architecture specific implementation, users need a "depends
|
|
* on $ARCH"
|
|
*/
|
|
int phys_to_target_node(phys_addr_t addr);
|
|
#else
|
|
static inline int numa_map_to_online_node(int node)
|
|
{
|
|
return NUMA_NO_NODE;
|
|
}
|
|
|
|
static inline int phys_to_target_node(phys_addr_t addr)
|
|
{
|
|
return NUMA_NO_NODE;
|
|
}
|
|
#endif
|
|
|
|
#endif /* _LINUX_NUMA_H */
|