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path: root/drivers/of/fdt.c
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Diffstat (limited to 'drivers/of/fdt.c')
-rw-r--r--drivers/of/fdt.c113
1 files changed, 68 insertions, 45 deletions
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index d134710de96d..3a896c9aeb74 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -9,6 +9,7 @@
* version 2 as published by the Free Software Foundation.
*/
+#include <linux/crc32.h>
#include <linux/kernel.h>
#include <linux/initrd.h>
#include <linux/memblock.h>
@@ -22,6 +23,7 @@
#include <linux/libfdt.h>
#include <linux/debugfs.h>
#include <linux/serial_core.h>
+#include <linux/sysfs.h>
#include <asm/setup.h> /* for COMMAND_LINE_SIZE */
#include <asm/page.h>
@@ -145,15 +147,15 @@ static void *unflatten_dt_alloc(void **mem, unsigned long size,
* @mem: Memory chunk to use for allocating device nodes and properties
* @p: pointer to node in flat tree
* @dad: Parent struct device_node
- * @allnextpp: pointer to ->allnext from last allocated device_node
* @fpsize: Size of the node path up at the current depth.
*/
static void * unflatten_dt_node(void *blob,
void *mem,
int *poffset,
struct device_node *dad,
- struct device_node ***allnextpp,
- unsigned long fpsize)
+ struct device_node **nodepp,
+ unsigned long fpsize,
+ bool dryrun)
{
const __be32 *p;
struct device_node *np;
@@ -200,7 +202,7 @@ static void * unflatten_dt_node(void *blob,
np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl,
__alignof__(struct device_node));
- if (allnextpp) {
+ if (!dryrun) {
char *fn;
of_node_init(np);
np->full_name = fn = ((char *)np) + sizeof(*np);
@@ -222,16 +224,10 @@ static void * unflatten_dt_node(void *blob,
memcpy(fn, pathp, l);
prev_pp = &np->properties;
- **allnextpp = np;
- *allnextpp = &np->allnext;
if (dad != NULL) {
np->parent = dad;
- /* we temporarily use the next field as `last_child'*/
- if (dad->next == NULL)
- dad->child = np;
- else
- dad->next->sibling = np;
- dad->next = np;
+ np->sibling = dad->child;
+ dad->child = np;
}
}
/* process properties */
@@ -254,7 +250,7 @@ static void * unflatten_dt_node(void *blob,
has_name = 1;
pp = unflatten_dt_alloc(&mem, sizeof(struct property),
__alignof__(struct property));
- if (allnextpp) {
+ if (!dryrun) {
/* We accept flattened tree phandles either in
* ePAPR-style "phandle" properties, or the
* legacy "linux,phandle" properties. If both
@@ -296,7 +292,7 @@ static void * unflatten_dt_node(void *blob,
sz = (pa - ps) + 1;
pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz,
__alignof__(struct property));
- if (allnextpp) {
+ if (!dryrun) {
pp->name = "name";
pp->length = sz;
pp->value = pp + 1;
@@ -308,7 +304,7 @@ static void * unflatten_dt_node(void *blob,
(char *)pp->value);
}
}
- if (allnextpp) {
+ if (!dryrun) {
*prev_pp = NULL;
np->name = of_get_property(np, "name", NULL);
np->type = of_get_property(np, "device_type", NULL);
@@ -324,12 +320,30 @@ static void * unflatten_dt_node(void *blob,
if (depth < 0)
depth = 0;
while (*poffset > 0 && depth > old_depth)
- mem = unflatten_dt_node(blob, mem, poffset, np, allnextpp,
- fpsize);
+ mem = unflatten_dt_node(blob, mem, poffset, np, NULL,
+ fpsize, dryrun);
if (*poffset < 0 && *poffset != -FDT_ERR_NOTFOUND)
pr_err("unflatten: error %d processing FDT\n", *poffset);
+ /*
+ * Reverse the child list. Some drivers assumes node order matches .dts
+ * node order
+ */
+ if (!dryrun && np->child) {
+ struct device_node *child = np->child;
+ np->child = NULL;
+ while (child) {
+ struct device_node *next = child->sibling;
+ child->sibling = np->child;
+ np->child = child;
+ child = next;
+ }
+ }
+
+ if (nodepp)
+ *nodepp = np;
+
return mem;
}
@@ -352,7 +366,6 @@ static void __unflatten_device_tree(void *blob,
unsigned long size;
int start;
void *mem;
- struct device_node **allnextp = mynodes;
pr_debug(" -> unflatten_device_tree()\n");
@@ -373,7 +386,7 @@ static void __unflatten_device_tree(void *blob,
/* First pass, scan for size */
start = 0;
- size = (unsigned long)unflatten_dt_node(blob, NULL, &start, NULL, NULL, 0);
+ size = (unsigned long)unflatten_dt_node(blob, NULL, &start, NULL, NULL, 0, true);
size = ALIGN(size, 4);
pr_debug(" size is %lx, allocating...\n", size);
@@ -388,11 +401,10 @@ static void __unflatten_device_tree(void *blob,
/* Second pass, do actual unflattening */
start = 0;
- unflatten_dt_node(blob, mem, &start, NULL, &allnextp, 0);
+ unflatten_dt_node(blob, mem, &start, NULL, mynodes, 0, false);
if (be32_to_cpup(mem + size) != 0xdeadbeef)
pr_warning("End of tree marker overwritten: %08x\n",
be32_to_cpup(mem + size));
- *allnextp = NULL;
pr_debug(" <- unflatten_device_tree()\n");
}
@@ -425,6 +437,8 @@ void *initial_boot_params;
#ifdef CONFIG_OF_EARLY_FLATTREE
+static u32 of_fdt_crc32;
+
/**
* res_mem_reserve_reg() - reserve all memory described in 'reg' property
*/
@@ -748,7 +762,7 @@ static inline void early_init_dt_check_for_initrd(unsigned long node)
#ifdef CONFIG_SERIAL_EARLYCON
extern struct of_device_id __earlycon_of_table[];
-int __init early_init_dt_scan_chosen_serial(void)
+static int __init early_init_dt_scan_chosen_serial(void)
{
int offset;
const char *p;
@@ -930,6 +944,11 @@ void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size)
const u64 phys_offset = __pa(PAGE_OFFSET);
if (!PAGE_ALIGNED(base)) {
+ if (size < PAGE_SIZE - (base & ~PAGE_MASK)) {
+ pr_warn("Ignoring memory block 0x%llx - 0x%llx\n",
+ base, base + size);
+ return;
+ }
size -= PAGE_SIZE - (base & ~PAGE_MASK);
base = PAGE_ALIGN(base);
}
@@ -992,15 +1011,14 @@ bool __init early_init_dt_verify(void *params)
if (!params)
return false;
- /* Setup flat device-tree pointer */
- initial_boot_params = params;
-
/* check device tree validity */
- if (fdt_check_header(params)) {
- initial_boot_params = NULL;
+ if (fdt_check_header(params))
return false;
- }
+ /* Setup flat device-tree pointer */
+ initial_boot_params = params;
+ of_fdt_crc32 = crc32_be(~0, initial_boot_params,
+ fdt_totalsize(initial_boot_params));
return true;
}
@@ -1039,7 +1057,7 @@ bool __init early_init_dt_scan(void *params)
*/
void __init unflatten_device_tree(void)
{
- __unflatten_device_tree(initial_boot_params, &of_allnodes,
+ __unflatten_device_tree(initial_boot_params, &of_root,
early_init_dt_alloc_memory_arch);
/* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */
@@ -1078,27 +1096,32 @@ void __init unflatten_and_copy_device_tree(void)
unflatten_device_tree();
}
-#if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
-static struct debugfs_blob_wrapper flat_dt_blob;
-
-static int __init of_flat_dt_debugfs_export_fdt(void)
+#ifdef CONFIG_SYSFS
+static ssize_t of_fdt_raw_read(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr,
+ char *buf, loff_t off, size_t count)
{
- struct dentry *d = debugfs_create_dir("device-tree", NULL);
-
- if (!d)
- return -ENOENT;
+ memcpy(buf, initial_boot_params + off, count);
+ return count;
+}
- flat_dt_blob.data = initial_boot_params;
- flat_dt_blob.size = fdt_totalsize(initial_boot_params);
+static int __init of_fdt_raw_init(void)
+{
+ static struct bin_attribute of_fdt_raw_attr =
+ __BIN_ATTR(fdt, S_IRUSR, of_fdt_raw_read, NULL, 0);
- d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
- d, &flat_dt_blob);
- if (!d)
- return -ENOENT;
+ if (!initial_boot_params)
+ return 0;
- return 0;
+ if (of_fdt_crc32 != crc32_be(~0, initial_boot_params,
+ fdt_totalsize(initial_boot_params))) {
+ pr_warn("fdt: not creating '/sys/firmware/fdt': CRC check failed\n");
+ return 0;
+ }
+ of_fdt_raw_attr.size = fdt_totalsize(initial_boot_params);
+ return sysfs_create_bin_file(firmware_kobj, &of_fdt_raw_attr);
}
-module_init(of_flat_dt_debugfs_export_fdt);
+late_initcall(of_fdt_raw_init);
#endif
#endif /* CONFIG_OF_EARLY_FLATTREE */
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-20 02:28:39 +0000