mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-16 01:46:51 +07:00
9b692102d8
get_mem_detect_end is already used in couple of places with potential to be utilized in more cases. Provide single get_mem_detect_end implementation in asm/mem_detect.h to be used by kasan and startup code. Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _ASM_S390_MEM_DETECT_H
|
|
#define _ASM_S390_MEM_DETECT_H
|
|
|
|
#include <linux/types.h>
|
|
|
|
enum mem_info_source {
|
|
MEM_DETECT_NONE = 0,
|
|
MEM_DETECT_SCLP_STOR_INFO,
|
|
MEM_DETECT_DIAG260,
|
|
MEM_DETECT_SCLP_READ_INFO,
|
|
MEM_DETECT_BIN_SEARCH
|
|
};
|
|
|
|
struct mem_detect_block {
|
|
u64 start;
|
|
u64 end;
|
|
};
|
|
|
|
/*
|
|
* Storage element id is defined as 1 byte (up to 256 storage elements).
|
|
* In practise only storage element id 0 and 1 are used).
|
|
* According to architecture one storage element could have as much as
|
|
* 1020 subincrements. 255 mem_detect_blocks are embedded in mem_detect_info.
|
|
* If more mem_detect_blocks are required, a block of memory from already
|
|
* known mem_detect_block is taken (entries_extended points to it).
|
|
*/
|
|
#define MEM_INLINED_ENTRIES 255 /* (PAGE_SIZE - 16) / 16 */
|
|
|
|
struct mem_detect_info {
|
|
u32 count;
|
|
u8 info_source;
|
|
struct mem_detect_block entries[MEM_INLINED_ENTRIES];
|
|
struct mem_detect_block *entries_extended;
|
|
};
|
|
extern struct mem_detect_info mem_detect;
|
|
|
|
void add_mem_detect_block(u64 start, u64 end);
|
|
|
|
static inline int __get_mem_detect_block(u32 n, unsigned long *start,
|
|
unsigned long *end)
|
|
{
|
|
if (n >= mem_detect.count) {
|
|
*start = 0;
|
|
*end = 0;
|
|
return -1;
|
|
}
|
|
|
|
if (n < MEM_INLINED_ENTRIES) {
|
|
*start = (unsigned long)mem_detect.entries[n].start;
|
|
*end = (unsigned long)mem_detect.entries[n].end;
|
|
} else {
|
|
*start = (unsigned long)mem_detect.entries_extended[n - MEM_INLINED_ENTRIES].start;
|
|
*end = (unsigned long)mem_detect.entries_extended[n - MEM_INLINED_ENTRIES].end;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* for_each_mem_detect_block - early online memory range iterator
|
|
* @i: an integer used as loop variable
|
|
* @p_start: ptr to unsigned long for start address of the range
|
|
* @p_end: ptr to unsigned long for end address of the range
|
|
*
|
|
* Walks over detected online memory ranges.
|
|
*/
|
|
#define for_each_mem_detect_block(i, p_start, p_end) \
|
|
for (i = 0, __get_mem_detect_block(i, p_start, p_end); \
|
|
i < mem_detect.count; \
|
|
i++, __get_mem_detect_block(i, p_start, p_end))
|
|
|
|
static inline void get_mem_detect_reserved(unsigned long *start,
|
|
unsigned long *size)
|
|
{
|
|
*start = (unsigned long)mem_detect.entries_extended;
|
|
if (mem_detect.count > MEM_INLINED_ENTRIES)
|
|
*size = (mem_detect.count - MEM_INLINED_ENTRIES) * sizeof(struct mem_detect_block);
|
|
else
|
|
*size = 0;
|
|
}
|
|
|
|
static inline unsigned long get_mem_detect_end(void)
|
|
{
|
|
unsigned long start;
|
|
unsigned long end;
|
|
|
|
if (mem_detect.count) {
|
|
__get_mem_detect_block(mem_detect.count - 1, &start, &end);
|
|
return end;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#endif
|