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-rw-r--r--arch/powerpc/include/asm/drmem.h48
-rw-r--r--arch/powerpc/kernel/prom.c115
-rw-r--r--arch/powerpc/mm/Makefile2
-rw-r--r--arch/powerpc/mm/drmem.c76
4 files changed, 174 insertions, 67 deletions
diff --git a/arch/powerpc/include/asm/drmem.h b/arch/powerpc/include/asm/drmem.h
new file mode 100644
index 000000000000..8b1fe465ec9d
--- /dev/null
+++ b/arch/powerpc/include/asm/drmem.h
@@ -0,0 +1,48 @@
+/*
+ * drmem.h: Power specific logical memory block representation
+ *
+ * Copyright 2017 IBM Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _ASM_POWERPC_LMB_H
+#define _ASM_POWERPC_LMB_H
+
+struct drmem_lmb {
+ u64 base_addr;
+ u32 drc_index;
+ u32 aa_index;
+ u32 flags;
+};
+
+struct drmem_lmb_info {
+ struct drmem_lmb *lmbs;
+ int n_lmbs;
+ u32 lmb_size;
+};
+
+extern struct drmem_lmb_info *drmem_info;
+
+#define for_each_drmem_lmb_in_range(lmb, start, end) \
+ for ((lmb) = (start); (lmb) <= (end); (lmb)++)
+
+#define for_each_drmem_lmb(lmb) \
+ for_each_drmem_lmb_in_range((lmb), \
+ &drmem_info->lmbs[0], \
+ &drmem_info->lmbs[drmem_info->n_lmbs - 1])
+
+static inline u32 drmem_lmb_size(void)
+{
+ return drmem_info->lmb_size;
+}
+
+#ifdef CONFIG_PPC_PSERIES
+void __init walk_drmem_lmbs_early(unsigned long node,
+ void (*func)(struct drmem_lmb *, const __be32 **));
+#endif
+
+#endif /* _ASM_POWERPC_LMB_H */
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index b15bae265c90..4dffef947b8a 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -59,6 +59,7 @@
#include <asm/epapr_hcalls.h>
#include <asm/firmware.h>
#include <asm/dt_cpu_ftrs.h>
+#include <asm/drmem.h>
#include <mm/mmu_decl.h>
@@ -455,92 +456,74 @@ static int __init early_init_dt_scan_chosen_ppc(unsigned long node,
#ifdef CONFIG_PPC_PSERIES
/*
- * Interpret the ibm,dynamic-memory property in the
- * /ibm,dynamic-reconfiguration-memory node.
+ * Interpret the ibm dynamic reconfiguration memory LMBs.
* This contains a list of memory blocks along with NUMA affinity
* information.
*/
-static int __init early_init_dt_scan_drconf_memory(unsigned long node)
+static void __init early_init_drmem_lmb(struct drmem_lmb *lmb,
+ const __be32 **usm)
{
- const __be32 *dm, *ls, *usm;
- int l;
- unsigned long n, flags;
- u64 base, size, memblock_size;
- unsigned int is_kexec_kdump = 0, rngs;
-
- ls = of_get_flat_dt_prop(node, "ibm,lmb-size", &l);
- if (ls == NULL || l < dt_root_size_cells * sizeof(__be32))
- return 0;
- memblock_size = dt_mem_next_cell(dt_root_size_cells, &ls);
+ u64 base, size;
+ int is_kexec_kdump = 0, rngs;
- dm = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l);
- if (dm == NULL || l < sizeof(__be32))
- return 0;
+ base = lmb->base_addr;
+ size = drmem_lmb_size();
+ rngs = 1;
- n = of_read_number(dm++, 1); /* number of entries */
- if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(__be32))
- return 0;
+ /*
+ * Skip this block if the reserved bit is set in flags
+ * or if the block is not assigned to this partition.
+ */
+ if ((lmb->flags & DRCONF_MEM_RESERVED) ||
+ !(lmb->flags & DRCONF_MEM_ASSIGNED))
+ return;
- /* check if this is a kexec/kdump kernel. */
- usm = of_get_flat_dt_prop(node, "linux,drconf-usable-memory",
- &l);
- if (usm != NULL)
+ if (*usm)
is_kexec_kdump = 1;
- for (; n != 0; --n) {
- base = dt_mem_next_cell(dt_root_addr_cells, &dm);
- flags = of_read_number(&dm[3], 1);
- /* skip DRC index, pad, assoc. list index, flags */
- dm += 4;
- /* skip this block if the reserved bit is set in flags
- or if the block is not assigned to this partition */
- if ((flags & DRCONF_MEM_RESERVED) ||
- !(flags & DRCONF_MEM_ASSIGNED))
- continue;
- size = memblock_size;
- rngs = 1;
+ if (is_kexec_kdump) {
+ /*
+ * For each memblock in ibm,dynamic-memory, a
+ * corresponding entry in linux,drconf-usable-memory
+ * property contains a counter 'p' followed by 'p'
+ * (base, size) duple. Now read the counter from
+ * linux,drconf-usable-memory property
+ */
+ rngs = dt_mem_next_cell(dt_root_size_cells, usm);
+ if (!rngs) /* there are no (base, size) duple */
+ return;
+ }
+
+ do {
if (is_kexec_kdump) {
- /*
- * For each memblock in ibm,dynamic-memory, a corresponding
- * entry in linux,drconf-usable-memory property contains
- * a counter 'p' followed by 'p' (base, size) duple.
- * Now read the counter from
- * linux,drconf-usable-memory property
- */
- rngs = dt_mem_next_cell(dt_root_size_cells, &usm);
- if (!rngs) /* there are no (base, size) duple */
+ base = dt_mem_next_cell(dt_root_addr_cells, usm);
+ size = dt_mem_next_cell(dt_root_size_cells, usm);
+ }
+
+ if (iommu_is_off) {
+ if (base >= 0x80000000ul)
continue;
+ if ((base + size) > 0x80000000ul)
+ size = 0x80000000ul - base;
}
- do {
- if (is_kexec_kdump) {
- base = dt_mem_next_cell(dt_root_addr_cells,
- &usm);
- size = dt_mem_next_cell(dt_root_size_cells,
- &usm);
- }
- if (iommu_is_off) {
- if (base >= 0x80000000ul)
- continue;
- if ((base + size) > 0x80000000ul)
- size = 0x80000000ul - base;
- }
- memblock_add(base, size);
- } while (--rngs);
- }
- memblock_dump_all();
- return 0;
+
+ DBG("Adding: %llx -> %llx\n", base, size);
+ memblock_add(base, size);
+ } while (--rngs);
}
-#else
-#define early_init_dt_scan_drconf_memory(node) 0
#endif /* CONFIG_PPC_PSERIES */
static int __init early_init_dt_scan_memory_ppc(unsigned long node,
const char *uname,
int depth, void *data)
{
+#ifdef CONFIG_PPC_PSERIES
if (depth == 1 &&
- strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
- return early_init_dt_scan_drconf_memory(node);
+ strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0) {
+ walk_drmem_lmbs_early(node, early_init_drmem_lmb);
+ return 0;
+ }
+#endif
return early_init_dt_scan_memory(node, uname, depth, data);
}
diff --git a/arch/powerpc/mm/Makefile b/arch/powerpc/mm/Makefile
index 76a6b057d454..8d271bfe2d94 100644
--- a/arch/powerpc/mm/Makefile
+++ b/arch/powerpc/mm/Makefile
@@ -9,7 +9,7 @@ ccflags-$(CONFIG_PPC64) := $(NO_MINIMAL_TOC)
obj-y := fault.o mem.o pgtable.o mmap.o \
init_$(BITS).o pgtable_$(BITS).o \
- init-common.o mmu_context.o
+ init-common.o mmu_context.o drmem.o
obj-$(CONFIG_PPC_MMU_NOHASH) += mmu_context_nohash.o tlb_nohash.o \
tlb_nohash_low.o
obj-$(CONFIG_PPC_BOOK3E) += tlb_low_$(BITS)e.o
diff --git a/arch/powerpc/mm/drmem.c b/arch/powerpc/mm/drmem.c
new file mode 100644
index 000000000000..f8ee0f355405
--- /dev/null
+++ b/arch/powerpc/mm/drmem.c
@@ -0,0 +1,76 @@
+/*
+ * Dynamic reconfiguration memory support
+ *
+ * Copyright 2017 IBM Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#define pr_fmt(fmt) "drmem: " fmt
+
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+#include <linux/memblock.h>
+#include <asm/prom.h>
+#include <asm/drmem.h>
+
+static struct drmem_lmb_info __drmem_info;
+struct drmem_lmb_info *drmem_info = &__drmem_info;
+
+#ifdef CONFIG_PPC_PSERIES
+static void __init read_drconf_v1_cell(struct drmem_lmb *lmb,
+ const __be32 **prop)
+{
+ const __be32 *p = *prop;
+
+ lmb->base_addr = dt_mem_next_cell(dt_root_addr_cells, &p);
+ lmb->drc_index = of_read_number(p++, 1);
+
+ p++; /* skip reserved field */
+
+ lmb->aa_index = of_read_number(p++, 1);
+ lmb->flags = of_read_number(p++, 1);
+
+ *prop = p;
+}
+
+static void __init __walk_drmem_v1_lmbs(const __be32 *prop, const __be32 *usm,
+ void (*func)(struct drmem_lmb *, const __be32 **))
+{
+ struct drmem_lmb lmb;
+ u32 i, n_lmbs;
+
+ n_lmbs = of_read_number(prop++, 1);
+
+ for (i = 0; i < n_lmbs; i++) {
+ read_drconf_v1_cell(&lmb, &prop);
+ func(&lmb, &usm);
+ }
+}
+
+void __init walk_drmem_lmbs_early(unsigned long node,
+ void (*func)(struct drmem_lmb *, const __be32 **))
+{
+ const __be32 *prop, *usm;
+ int len;
+
+ prop = of_get_flat_dt_prop(node, "ibm,lmb-size", &len);
+ if (!prop || len < dt_root_size_cells * sizeof(__be32))
+ return;
+
+ drmem_info->lmb_size = dt_mem_next_cell(dt_root_size_cells, &prop);
+
+ usm = of_get_flat_dt_prop(node, "linux,drconf-usable-memory", &len);
+
+ prop = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &len);
+ if (prop)
+ __walk_drmem_v1_lmbs(prop, usm, func);
+
+ memblock_dump_all();
+}
+
+#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-13 11:18:37 +0000