/* * Procedures for maintaining information about logical memory blocks. * * Peter Bergner, IBM Corp. June 2001. * Copyright (C) 2001 Peter Bergner. * * SPDX-License-Identifier: GPL-2.0+ */ #include <common.h> #include <lmb.h> #define LMB_ALLOC_ANYWHERE 0 void lmb_dump_all(struct lmb *lmb) { #ifdef DEBUG unsigned long i; debug("lmb_dump_all:\n"); debug(" memory.cnt = 0x%lx\n", lmb->memory.cnt); debug(" memory.size = 0x%llx\n", (unsigned long long)lmb->memory.size); for (i=0; i < lmb->memory.cnt ;i++) { debug(" memory.reg[0x%lx].base = 0x%llx\n", i, (long long unsigned)lmb->memory.region[i].base); debug(" .size = 0x%llx\n", (long long unsigned)lmb->memory.region[i].size); } debug("\n reserved.cnt = 0x%lx\n", lmb->reserved.cnt); debug(" reserved.size = 0x%llx\n", (long long unsigned)lmb->reserved.size); for (i=0; i < lmb->reserved.cnt ;i++) { debug(" reserved.reg[0x%lx].base = 0x%llx\n", i, (long long unsigned)lmb->reserved.region[i].base); debug(" .size = 0x%llx\n", (long long unsigned)lmb->reserved.region[i].size); } #endif /* DEBUG */ } static long lmb_addrs_overlap(phys_addr_t base1, phys_size_t size1, phys_addr_t base2, phys_size_t size2) { return ((base1 < (base2+size2)) && (base2 < (base1+size1))); } static long lmb_addrs_adjacent(phys_addr_t base1, phys_size_t size1, phys_addr_t base2, phys_size_t size2) { if (base2 == base1 + size1) return 1; else if (base1 == base2 + size2) return -1; return 0; } static long lmb_regions_adjacent(struct lmb_region *rgn, unsigned long r1, unsigned long r2) { phys_addr_t base1 = rgn->region[r1].base; phys_size_t size1 = rgn->region[r1].size; phys_addr_t base2 = rgn->region[r2].base; phys_size_t size2 = rgn->region[r2].size; return lmb_addrs_adjacent(base1, size1, base2, size2); } static void lmb_remove_region(struct lmb_region *rgn, unsigned long r) { unsigned long i; for (i = r; i < rgn->cnt - 1; i++) { rgn->region[i].base = rgn->region[i + 1].base; rgn->region[i].size = rgn->region[i + 1].size; } rgn->cnt--; } /* Assumption: base addr of region 1 < base addr of region 2 */ static void lmb_coalesce_regions(struct lmb_region *rgn, unsigned long r1, unsigned long r2) { rgn->region[r1].size += rgn->region[r2].size; lmb_remove_region(rgn, r2); } void lmb_init(struct lmb *lmb) { /* Create a dummy zero size LMB which will get coalesced away later. * This simplifies the lmb_add() code below... */ lmb->memory.region[0].base = 0; lmb->memory.region[0].size = 0; lmb->memory.cnt = 1; lmb->memory.size = 0; /* Ditto. */ lmb->reserved.region[0].base = 0; lmb->reserved.region[0].size = 0; lmb->reserved.cnt = 1; lmb->reserved.size = 0; } /* This routine called with relocation disabled. */ static long lmb_add_region(struct lmb_region *rgn, phys_addr_t base, phys_size_t size) { unsigned long coalesced = 0; long adjacent, i; if ((rgn->cnt == 1) && (rgn->region[0].size == 0)) { rgn->region[0].base = base; rgn->region[0].size = size; return 0; } /* First try and coalesce this LMB with another. */ for (i=0; i < rgn->cnt; i++) { phys_addr_t rgnbase = rgn->region[i].base; phys_size_t rgnsize = rgn->region[i].size; if ((rgnbase == base) && (rgnsize == size)) /* Already have this region, so we're done */ return 0; adjacent = lmb_addrs_adjacent(base,size,rgnbase,rgnsize); if ( adjacent > 0 ) { rgn->region[i].base -= size; rgn->region[i].size += size; coalesced++; break; } else if ( adjacent < 0 ) { rgn->region[i].size += size; coalesced++; break; } } if ((i < rgn->cnt-1) && lmb_regions_adjacent(rgn, i, i+1) ) { lmb_coalesce_regions(rgn, i, i+1); coalesced++; } if (coalesced) return coalesced; if (rgn->cnt >= MAX_LMB_REGIONS) return -1; /* Couldn't coalesce the LMB, so add it to the sorted table. */ for (i = rgn->cnt-1; i >= 0; i--) { if (base < rgn->region[i].base) { rgn->region[i+1].base = rgn->region[i].base; rgn->region[i+1].size = rgn->region[i].size; } else { rgn->region[i+1].base = base; rgn->region[i+1].size = size; break; } } if (base < rgn->region[0].base) { rgn->region[0].base = base; rgn->region[0].size = size; } rgn->cnt++; return 0; } /* This routine may be called with relocation disabled. */ long lmb_add(struct lmb *lmb, phys_addr_t base, phys_size_t size) { struct lmb_region *_rgn = &(lmb->memory); return lmb_add_region(_rgn, base, size); } long lmb_free(struct lmb *lmb, phys_addr_t base, phys_size_t size) { struct lmb_region *rgn = &(lmb->reserved); phys_addr_t rgnbegin, rgnend; phys_addr_t end = base + size; int i; rgnbegin = rgnend = 0; /* supress gcc warnings */ /* Find the region where (base, size) belongs to */ for (i=0; i < rgn->cnt; i++) { rgnbegin = rgn->region[i].base; rgnend = rgnbegin + rgn->region[i].size; if ((rgnbegin <= base) && (end <= rgnend)) break; } /* Didn't find the region */ if (i == rgn->cnt) return -1; /* Check to see if we are removing entire region */ if ((rgnbegin == base) && (rgnend == end)) { lmb_remove_region(rgn, i); return 0; } /* Check to see if region is matching at the front */ if (rgnbegin == base) { rgn->region[i].base = end; rgn->region[i].size -= size; return 0; } /* Check to see if the region is matching at the end */ if (rgnend == end) { rgn->region[i].size -= size; return 0; } /* * We need to split the entry - adjust the current one to the * beginging of the hole and add the region after hole. */ rgn->region[i].size = base - rgn->region[i].base; return lmb_add_region(rgn, end, rgnend - end); } long lmb_reserve(struct lmb *lmb, phys_addr_t base, phys_size_t size) { struct lmb_region *_rgn = &(lmb->reserved); return lmb_add_region(_rgn, base, size); } static long lmb_overlaps_region(struct lmb_region *rgn, phys_addr_t base, phys_size_t size) { unsigned long i; for (i=0; i < rgn->cnt; i++) { phys_addr_t rgnbase = rgn->region[i].base; phys_size_t rgnsize = rgn->region[i].size; if ( lmb_addrs_overlap(base,size,rgnbase,rgnsize) ) { break; } } return (i < rgn->cnt) ? i : -1; } phys_addr_t lmb_alloc(struct lmb *lmb, phys_size_t size, ulong align) { return lmb_alloc_base(lmb, size, align, LMB_ALLOC_ANYWHERE); } phys_addr_t lmb_alloc_base(struct lmb *lmb, phys_size_t size, ulong align, phys_addr_t max_addr) { phys_addr_t alloc; alloc = __lmb_alloc_base(lmb, size, align, max_addr); if (alloc == 0) printf("ERROR: Failed to allocate 0x%lx bytes below 0x%lx.\n", (ulong)size, (ulong)max_addr); return alloc; } static phys_addr_t lmb_align_down(phys_addr_t addr, phys_size_t size) { return addr & ~(size - 1); } static phys_addr_t lmb_align_up(phys_addr_t addr, ulong size) { return (addr + (size - 1)) & ~(size - 1); } phys_addr_t __lmb_alloc_base(struct lmb *lmb, phys_size_t size, ulong align, phys_addr_t max_addr) { long i, j; phys_addr_t base = 0; phys_addr_t res_base; for (i = lmb->memory.cnt-1; i >= 0; i--) { phys_addr_t lmbbase = lmb->memory.region[i].base; phys_size_t lmbsize = lmb->memory.region[i].size; if (lmbsize < size) continue; if (max_addr == LMB_ALLOC_ANYWHERE) base = lmb_align_down(lmbbase + lmbsize - size, align); else if (lmbbase < max_addr) { base = lmbbase + lmbsize; if (base < lmbbase) base = -1; base = min(base, max_addr); base = lmb_align_down(base - size, align); } else continue; while (base && lmbbase <= base) { j = lmb_overlaps_region(&lmb->reserved, base, size); if (j < 0) { /* This area isn't reserved, take it */ if (lmb_add_region(&lmb->reserved, base, lmb_align_up(size, align)) < 0) return 0; return base; } res_base = lmb->reserved.region[j].base; if (res_base < size) break; base = lmb_align_down(res_base - size, align); } } return 0; } int lmb_is_reserved(struct lmb *lmb, phys_addr_t addr) { int i; for (i = 0; i < lmb->reserved.cnt; i++) { phys_addr_t upper = lmb->reserved.region[i].base + lmb->reserved.region[i].size - 1; if ((addr >= lmb->reserved.region[i].base) && (addr <= upper)) return 1; } return 0; } __weak void board_lmb_reserve(struct lmb *lmb) { /* please define platform specific board_lmb_reserve() */ } __weak void arch_lmb_reserve(struct lmb *lmb) { /* please define platform specific arch_lmb_reserve() */ }