118 lines
3.1 KiB
C
118 lines
3.1 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_S390_MEM_DETECT_H
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#define _ASM_S390_MEM_DETECT_H
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#include <linux/types.h>
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enum mem_info_source {
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MEM_DETECT_NONE = 0,
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MEM_DETECT_SCLP_STOR_INFO,
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MEM_DETECT_DIAG260,
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MEM_DETECT_SCLP_READ_INFO,
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MEM_DETECT_BIN_SEARCH
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};
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struct mem_detect_block {
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u64 start;
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u64 end;
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};
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/*
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* Storage element id is defined as 1 byte (up to 256 storage elements).
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* In practise only storage element id 0 and 1 are used).
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* According to architecture one storage element could have as much as
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* 1020 subincrements. 255 mem_detect_blocks are embedded in mem_detect_info.
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* If more mem_detect_blocks are required, a block of memory from already
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* known mem_detect_block is taken (entries_extended points to it).
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*/
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#define MEM_INLINED_ENTRIES 255 /* (PAGE_SIZE - 16) / 16 */
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struct mem_detect_info {
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u32 count;
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u8 info_source;
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unsigned long usable;
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struct mem_detect_block entries[MEM_INLINED_ENTRIES];
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struct mem_detect_block *entries_extended;
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};
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extern struct mem_detect_info mem_detect;
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void add_mem_detect_block(u64 start, u64 end);
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static inline int __get_mem_detect_block(u32 n, unsigned long *start,
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unsigned long *end, bool respect_usable_limit)
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{
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if (n >= mem_detect.count) {
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*start = 0;
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*end = 0;
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return -1;
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}
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if (n < MEM_INLINED_ENTRIES) {
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*start = (unsigned long)mem_detect.entries[n].start;
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*end = (unsigned long)mem_detect.entries[n].end;
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} else {
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*start = (unsigned long)mem_detect.entries_extended[n - MEM_INLINED_ENTRIES].start;
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*end = (unsigned long)mem_detect.entries_extended[n - MEM_INLINED_ENTRIES].end;
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}
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if (respect_usable_limit && mem_detect.usable) {
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if (*start >= mem_detect.usable)
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return -1;
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if (*end > mem_detect.usable)
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*end = mem_detect.usable;
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}
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return 0;
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}
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/**
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* for_each_mem_detect_usable_block - early online memory range iterator
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* @i: an integer used as loop variable
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* @p_start: ptr to unsigned long for start address of the range
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* @p_end: ptr to unsigned long for end address of the range
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*
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* Walks over detected online memory ranges below usable limit.
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*/
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#define for_each_mem_detect_usable_block(i, p_start, p_end) \
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for (i = 0; !__get_mem_detect_block(i, p_start, p_end, true); i++)
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/* Walks over all detected online memory ranges disregarding usable limit. */
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#define for_each_mem_detect_block(i, p_start, p_end) \
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for (i = 0; !__get_mem_detect_block(i, p_start, p_end, false); i++)
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static inline unsigned long get_mem_detect_usable_total(void)
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{
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unsigned long start, end, total = 0;
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int i;
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for_each_mem_detect_usable_block(i, &start, &end)
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total += end - start;
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return total;
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}
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static inline void get_mem_detect_reserved(unsigned long *start,
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unsigned long *size)
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{
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*start = (unsigned long)mem_detect.entries_extended;
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if (mem_detect.count > MEM_INLINED_ENTRIES)
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*size = (mem_detect.count - MEM_INLINED_ENTRIES) * sizeof(struct mem_detect_block);
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else
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*size = 0;
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}
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static inline unsigned long get_mem_detect_end(void)
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{
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unsigned long start;
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unsigned long end;
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if (mem_detect.usable)
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return mem_detect.usable;
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if (mem_detect.count) {
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__get_mem_detect_block(mem_detect.count - 1, &start, &end, false);
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return end;
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}
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return 0;
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}
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#endif
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