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Subject[PATCH v2] of/fdt: Rework early_init_dt_scan_memory() to call directly
Date
Use of the of_scan_flat_dt() function predates libfdt and is discouraged
as libfdt provides a nicer set of APIs. Rework
early_init_dt_scan_memory() to be called directly and use libfdt.

Cc: John Crispin <john@phrozen.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frank Rowand <frowand.list@gmail.com>
Cc: linux-mips@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Rob Herring <robh@kernel.org>
---
v2:
- ralink: Use 'if' instead of 'else if'
- early_init_dt_scan_memory: continue instead of return on no reg
- Fix indentation
---
arch/mips/ralink/of.c | 19 +++--------
arch/powerpc/kernel/prom.c | 16 ++++-----
drivers/of/fdt.c | 68 ++++++++++++++++++++------------------
include/linux/of_fdt.h | 3 +-
4 files changed, 49 insertions(+), 57 deletions(-)

diff --git a/arch/mips/ralink/of.c b/arch/mips/ralink/of.c
index 0135376c5de5..35a87a2da10b 100644
--- a/arch/mips/ralink/of.c
+++ b/arch/mips/ralink/of.c
@@ -53,17 +53,6 @@ void __init device_tree_init(void)
unflatten_and_copy_device_tree();
}

-static int memory_dtb;
-
-static int __init early_init_dt_find_memory(unsigned long node,
- const char *uname, int depth, void *data)
-{
- if (depth == 1 && !strcmp(uname, "memory@0"))
- memory_dtb = 1;
-
- return 0;
-}
-
void __init plat_mem_setup(void)
{
void *dtb;
@@ -77,10 +66,10 @@ void __init plat_mem_setup(void)
dtb = get_fdt();
__dt_setup_arch(dtb);

- of_scan_flat_dt(early_init_dt_find_memory, NULL);
- if (memory_dtb)
- of_scan_flat_dt(early_init_dt_scan_memory, NULL);
- else if (soc_info.mem_detect)
+ if (!early_init_dt_scan_memory())
+ return;
+
+ if (soc_info.mem_detect)
soc_info.mem_detect();
else if (soc_info.mem_size)
memblock_add(soc_info.mem_base, soc_info.mem_size * SZ_1M);
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 6e1a106f02eb..63762a3b75e8 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -532,19 +532,19 @@ static int __init early_init_drmem_lmb(struct drmem_lmb *lmb,
}
#endif /* CONFIG_PPC_PSERIES */

-static int __init early_init_dt_scan_memory_ppc(unsigned long node,
- const char *uname,
- int depth, void *data)
+static int __init early_init_dt_scan_memory_ppc(void)
{
#ifdef CONFIG_PPC_PSERIES
- if (depth == 1 &&
- strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0) {
+ const void *fdt = initial_boot_params;
+ int node = fdt_path_offset(fdt, "/ibm,dynamic-reconfiguration-memory");
+
+ if (node > 0) {
walk_drmem_lmbs_early(node, NULL, early_init_drmem_lmb);
return 0;
}
#endif

- return early_init_dt_scan_memory(node, uname, depth, data);
+ return early_init_dt_scan_memory();
}

/*
@@ -749,7 +749,7 @@ void __init early_init_devtree(void *params)

/* Scan memory nodes and rebuild MEMBLOCKs */
early_init_dt_scan_root();
- of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
+ early_init_dt_scan_memory_ppc();

parse_early_param();

@@ -858,7 +858,7 @@ void __init early_get_first_memblock_info(void *params, phys_addr_t *size)
*/
add_mem_to_memblock = 0;
early_init_dt_scan_root();
- of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
+ early_init_dt_scan_memory_ppc();
add_mem_to_memblock = 1;

if (size)
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 5e216555fe4f..a835c458f50a 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -1078,49 +1078,53 @@ u64 __init dt_mem_next_cell(int s, const __be32 **cellp)
/*
* early_init_dt_scan_memory - Look for and parse memory nodes
*/
-int __init early_init_dt_scan_memory(unsigned long node, const char *uname,
- int depth, void *data)
+int __init early_init_dt_scan_memory(void)
{
- const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
- const __be32 *reg, *endp;
- int l;
- bool hotpluggable;
+ int node;
+ const void *fdt = initial_boot_params;

- /* We are scanning "memory" nodes only */
- if (type == NULL || strcmp(type, "memory") != 0)
- return 0;
+ fdt_for_each_subnode(node, fdt, 0) {
+ const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
+ const __be32 *reg, *endp;
+ int l;
+ bool hotpluggable;

- reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);
- if (reg == NULL)
- reg = of_get_flat_dt_prop(node, "reg", &l);
- if (reg == NULL)
- return 0;
+ /* We are scanning "memory" nodes only */
+ if (type == NULL || strcmp(type, "memory") != 0)
+ continue;

- endp = reg + (l / sizeof(__be32));
- hotpluggable = of_get_flat_dt_prop(node, "hotpluggable", NULL);
+ reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);
+ if (reg == NULL)
+ reg = of_get_flat_dt_prop(node, "reg", &l);
+ if (reg == NULL)
+ continue;

- pr_debug("memory scan node %s, reg size %d,\n", uname, l);
+ endp = reg + (l / sizeof(__be32));
+ hotpluggable = of_get_flat_dt_prop(node, "hotpluggable", NULL);

- while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
- u64 base, size;
+ pr_debug("memory scan node %s, reg size %d,\n",
+ fdt_get_name(fdt, node, NULL), l);

- base = dt_mem_next_cell(dt_root_addr_cells, &reg);
- size = dt_mem_next_cell(dt_root_size_cells, &reg);
+ while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
+ u64 base, size;

- if (size == 0)
- continue;
- pr_debug(" - %llx, %llx\n", base, size);
+ base = dt_mem_next_cell(dt_root_addr_cells, &reg);
+ size = dt_mem_next_cell(dt_root_size_cells, &reg);

- early_init_dt_add_memory_arch(base, size);
+ if (size == 0)
+ continue;
+ pr_debug(" - %llx, %llx\n", base, size);

- if (!hotpluggable)
- continue;
+ early_init_dt_add_memory_arch(base, size);

- if (memblock_mark_hotplug(base, size))
- pr_warn("failed to mark hotplug range 0x%llx - 0x%llx\n",
- base, base + size);
- }
+ if (!hotpluggable)
+ continue;

+ if (memblock_mark_hotplug(base, size))
+ pr_warn("failed to mark hotplug range 0x%llx - 0x%llx\n",
+ base, base + size);
+ }
+ }
return 0;
}

@@ -1271,7 +1275,7 @@ void __init early_init_dt_scan_nodes(void)
pr_warn("No chosen node found, continuing without\n");

/* Setup memory, calling early_init_dt_add_memory_arch */
- of_scan_flat_dt(early_init_dt_scan_memory, NULL);
+ early_init_dt_scan_memory();

/* Handle linux,usable-memory-range property */
memblock_cap_memory_range(cap_mem_addr, cap_mem_size);
diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
index df3d31926c3c..914739f3c192 100644
--- a/include/linux/of_fdt.h
+++ b/include/linux/of_fdt.h
@@ -59,8 +59,7 @@ extern unsigned long of_get_flat_dt_root(void);
extern uint32_t of_get_flat_dt_phandle(unsigned long node);

extern int early_init_dt_scan_chosen(char *cmdline);
-extern int early_init_dt_scan_memory(unsigned long node, const char *uname,
- int depth, void *data);
+extern int early_init_dt_scan_memory(void);
extern int early_init_dt_scan_chosen_stdout(void);
extern void early_init_fdt_scan_reserved_mem(void);
extern void early_init_fdt_reserve_self(void);
--
2.32.0
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