return res;
}
-/**
- * unflatten_dt_node - Alloc and populate a device_node from the flat tree
- * @blob: The parent device tree blob
- * @mem: Memory chunk to use for allocating device nodes and properties
- * @poffset: pointer to node in flat tree
- * @dad: Parent struct device_node
- * @nodepp: The device_node tree created by the call
- * @fpsize: Size of the node path up at the current depth.
- * @dryrun: If true, do not allocate device nodes but still calculate needed
- * memory size
- */
-static void * unflatten_dt_node(const void *blob,
- void *mem,
- int *poffset,
- struct device_node *dad,
- struct device_node **nodepp,
- unsigned long fpsize,
+static void populate_properties(const void *blob,
+ int offset,
+ void **mem,
+ struct device_node *np,
+ const char *nodename,
bool dryrun)
{
- const __be32 *p;
+ struct property *pp, **pprev = NULL;
+ int cur;
+ bool has_name = false;
+
+ pprev = &np->properties;
+ for (cur = fdt_first_property_offset(blob, offset);
+ cur >= 0;
+ cur = fdt_next_property_offset(blob, cur)) {
+ const __be32 *val;
+ const char *pname;
+ u32 sz;
+
+ val = fdt_getprop_by_offset(blob, cur, &pname, &sz);
+ if (!val) {
+ pr_warn("%s: Cannot locate property at 0x%x\n",
+ __func__, cur);
+ continue;
+ }
+
+ if (!pname) {
+ pr_warn("%s: Cannot find property name at 0x%x\n",
+ __func__, cur);
+ continue;
+ }
+
+ if (!strcmp(pname, "name"))
+ has_name = true;
+
+ pp = unflatten_dt_alloc(mem, sizeof(struct property),
+ __alignof__(struct property));
+ if (dryrun)
+ continue;
+
+ /* We accept flattened tree phandles either in
+ * ePAPR-style "phandle" properties, or the
+ * legacy "linux,phandle" properties. If both
+ * appear and have different values, things
+ * will get weird. Don't do that.
+ */
+ if (!strcmp(pname, "phandle") ||
+ !strcmp(pname, "linux,phandle")) {
+ if (!np->phandle)
+ np->phandle = be32_to_cpup(val);
+ }
+
+ /* And we process the "ibm,phandle" property
+ * used in pSeries dynamic device tree
+ * stuff
+ */
+ if (!strcmp(pname, "ibm,phandle"))
+ np->phandle = be32_to_cpup(val);
+
+ pp->name = (char *)pname;
+ pp->length = sz;
+ pp->value = (__be32 *)val;
+ *pprev = pp;
+ pprev = &pp->next;
+ }
+
+ /* With version 0x10 we may not have the name property,
+ * recreate it here from the unit name if absent
+ */
+ if (!has_name) {
+ const char *p = nodename, *ps = p, *pa = NULL;
+ int len;
+
+ while (*p) {
+ if ((*p) == '@')
+ pa = p;
+ else if ((*p) == '/')
+ ps = p + 1;
+ p++;
+ }
+
+ if (pa < ps)
+ pa = p;
+ len = (pa - ps) + 1;
+ pp = unflatten_dt_alloc(mem, sizeof(struct property) + len,
+ __alignof__(struct property));
+ if (!dryrun) {
+ pp->name = "name";
+ pp->length = len;
+ pp->value = pp + 1;
+ *pprev = pp;
+ pprev = &pp->next;
+ memcpy(pp->value, ps, len - 1);
+ ((char *)pp->value)[len - 1] = 0;
+ pr_debug("fixed up name for %s -> %s\n",
+ nodename, (char *)pp->value);
+ }
+ }
+
+ if (!dryrun)
+ *pprev = NULL;
+}
+
+static unsigned int populate_node(const void *blob,
+ int offset,
+ void **mem,
+ struct device_node *dad,
+ unsigned int fpsize,
+ struct device_node **pnp,
+ bool dryrun)
+{
struct device_node *np;
- struct property *pp, **prev_pp = NULL;
const char *pathp;
unsigned int l, allocl;
- static int depth;
- int old_depth;
- int offset;
- int has_name = 0;
int new_format = 0;
- pathp = fdt_get_name(blob, *poffset, &l);
- if (!pathp)
- return mem;
+ pathp = fdt_get_name(blob, offset, &l);
+ if (!pathp) {
+ *pnp = NULL;
+ return 0;
+ }
allocl = ++l;
}
}
- np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl,
+ np = unflatten_dt_alloc(mem, sizeof(struct device_node) + allocl,
__alignof__(struct device_node));
if (!dryrun) {
char *fn;
}
memcpy(fn, pathp, l);
- prev_pp = &np->properties;
if (dad != NULL) {
np->parent = dad;
np->sibling = dad->child;
dad->child = np;
}
}
- /* process properties */
- for (offset = fdt_first_property_offset(blob, *poffset);
- (offset >= 0);
- (offset = fdt_next_property_offset(blob, offset))) {
- const char *pname;
- u32 sz;
-
- if (!(p = fdt_getprop_by_offset(blob, offset, &pname, &sz))) {
- offset = -FDT_ERR_INTERNAL;
- break;
- }
- if (pname == NULL) {
- pr_info("Can't find property name in list !\n");
- break;
- }
- if (strcmp(pname, "name") == 0)
- has_name = 1;
- pp = unflatten_dt_alloc(&mem, sizeof(struct property),
- __alignof__(struct property));
- if (!dryrun) {
- /* We accept flattened tree phandles either in
- * ePAPR-style "phandle" properties, or the
- * legacy "linux,phandle" properties. If both
- * appear and have different values, things
- * will get weird. Don't do that. */
- if ((strcmp(pname, "phandle") == 0) ||
- (strcmp(pname, "linux,phandle") == 0)) {
- if (np->phandle == 0)
- np->phandle = be32_to_cpup(p);
- }
- /* And we process the "ibm,phandle" property
- * used in pSeries dynamic device tree
- * stuff */
- if (strcmp(pname, "ibm,phandle") == 0)
- np->phandle = be32_to_cpup(p);
- pp->name = (char *)pname;
- pp->length = sz;
- pp->value = (__be32 *)p;
- *prev_pp = pp;
- prev_pp = &pp->next;
- }
- }
- /* with version 0x10 we may not have the name property, recreate
- * it here from the unit name if absent
- */
- if (!has_name) {
- const char *p1 = pathp, *ps = pathp, *pa = NULL;
- int sz;
-
- while (*p1) {
- if ((*p1) == '@')
- pa = p1;
- if ((*p1) == '/')
- ps = p1 + 1;
- p1++;
- }
- if (pa < ps)
- pa = p1;
- sz = (pa - ps) + 1;
- pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz,
- __alignof__(struct property));
- if (!dryrun) {
- pp->name = "name";
- pp->length = sz;
- pp->value = pp + 1;
- *prev_pp = pp;
- prev_pp = &pp->next;
- memcpy(pp->value, ps, sz - 1);
- ((char *)pp->value)[sz - 1] = 0;
- pr_debug("fixed up name for %s -> %s\n", pathp,
- (char *)pp->value);
- }
- }
+ populate_properties(blob, offset, mem, np, pathp, dryrun);
if (!dryrun) {
- *prev_pp = NULL;
np->name = of_get_property(np, "name", NULL);
np->type = of_get_property(np, "device_type", NULL);
np->type = "<NULL>";
}
- old_depth = depth;
- *poffset = fdt_next_node(blob, *poffset, &depth);
- if (depth < 0)
- depth = 0;
- while (*poffset > 0 && depth > old_depth)
- mem = unflatten_dt_node(blob, mem, poffset, np, NULL,
- fpsize, dryrun);
+ *pnp = np;
+ return fpsize;
+}
+
+static void reverse_nodes(struct device_node *parent)
+{
+ struct device_node *child, *next;
+
+ /* In-depth first */
+ child = parent->child;
+ while (child) {
+ reverse_nodes(child);
+
+ child = child->sibling;
+ }
+
+ /* Reverse the nodes in the child list */
+ child = parent->child;
+ parent->child = NULL;
+ while (child) {
+ next = child->sibling;
+
+ child->sibling = parent->child;
+ parent->child = child;
+ child = next;
+ }
+}
+
+/**
+ * unflatten_dt_nodes - Alloc and populate a device_node from the flat tree
+ * @blob: The parent device tree blob
+ * @mem: Memory chunk to use for allocating device nodes and properties
+ * @dad: Parent struct device_node
+ * @nodepp: The device_node tree created by the call
+ *
+ * It returns the size of unflattened device tree or error code
+ */
+static int unflatten_dt_nodes(const void *blob,
+ void *mem,
+ struct device_node *dad,
+ struct device_node **nodepp)
+{
+ struct device_node *root;
+ int offset = 0, depth = 0;
+#define FDT_MAX_DEPTH 64
+ unsigned int fpsizes[FDT_MAX_DEPTH];
+ struct device_node *nps[FDT_MAX_DEPTH];
+ void *base = mem;
+ bool dryrun = !base;
- if (*poffset < 0 && *poffset != -FDT_ERR_NOTFOUND)
- pr_err("unflatten: error %d processing FDT\n", *poffset);
+ if (nodepp)
+ *nodepp = NULL;
+
+ root = dad;
+ fpsizes[depth] = dad ? strlen(of_node_full_name(dad)) : 0;
+ nps[depth] = dad;
+ for (offset = 0;
+ offset >= 0 && depth >= 0;
+ offset = fdt_next_node(blob, offset, &depth)) {
+ if (WARN_ON_ONCE(depth >= FDT_MAX_DEPTH))
+ continue;
+
+ fpsizes[depth+1] = populate_node(blob, offset, &mem,
+ nps[depth],
+ fpsizes[depth],
+ &nps[depth+1], dryrun);
+ if (!fpsizes[depth+1])
+ return mem - base;
+
+ if (!dryrun && nodepp && !*nodepp)
+ *nodepp = nps[depth+1];
+ if (!dryrun && !root)
+ root = nps[depth+1];
+ }
+
+ if (offset < 0 && offset != -FDT_ERR_NOTFOUND) {
+ pr_err("%s: Error %d processing FDT\n", __func__, offset);
+ return -EINVAL;
+ }
/*
* 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;
+ if (!dryrun)
+ reverse_nodes(root);
- return mem;
+ return mem - base;
}
/**
* pointers of the nodes so the normal device-tree walking functions
* can be used.
* @blob: The blob to expand
+ * @dad: Parent device node
* @mynodes: The device_node tree created by the call
* @dt_alloc: An allocator that provides a virtual address to memory
* for the resulting tree
+ *
+ * Returns NULL on failure or the memory chunk containing the unflattened
+ * device tree on success.
*/
-static void __unflatten_device_tree(const void *blob,
- struct device_node **mynodes,
- void * (*dt_alloc)(u64 size, u64 align))
+static void *__unflatten_device_tree(const void *blob,
+ struct device_node *dad,
+ struct device_node **mynodes,
+ void *(*dt_alloc)(u64 size, u64 align))
{
- unsigned long size;
- int start;
+ int size;
void *mem;
pr_debug(" -> unflatten_device_tree()\n");
if (!blob) {
pr_debug("No device tree pointer\n");
- return;
+ return NULL;
}
pr_debug("Unflattening device tree:\n");
if (fdt_check_header(blob)) {
pr_err("Invalid device tree blob header\n");
- return;
+ return NULL;
}
/* First pass, scan for size */
- start = 0;
- size = (unsigned long)unflatten_dt_node(blob, NULL, &start, NULL, NULL, 0, true);
- size = ALIGN(size, 4);
+ size = unflatten_dt_nodes(blob, NULL, dad, NULL);
+ if (size < 0)
+ return NULL;
- pr_debug(" size is %lx, allocating...\n", size);
+ size = ALIGN(size, 4);
+ pr_debug(" size is %d, allocating...\n", size);
/* Allocate memory for the expanded device tree */
mem = dt_alloc(size + 4, __alignof__(struct device_node));
pr_debug(" unflattening %p...\n", mem);
/* Second pass, do actual unflattening */
- start = 0;
- unflatten_dt_node(blob, mem, &start, NULL, mynodes, 0, false);
+ unflatten_dt_nodes(blob, mem, dad, mynodes);
if (be32_to_cpup(mem + size) != 0xdeadbeef)
pr_warning("End of tree marker overwritten: %08x\n",
be32_to_cpup(mem + size));
pr_debug(" <- unflatten_device_tree()\n");
+ return mem;
}
static void *kernel_tree_alloc(u64 size, u64 align)
/**
* of_fdt_unflatten_tree - create tree of device_nodes from flat blob
+ * @blob: Flat device tree blob
+ * @dad: Parent device node
+ * @mynodes: The device tree created by the call
*
* unflattens the device-tree passed by the firmware, creating the
* tree of struct device_node. It also fills the "name" and "type"
* pointers of the nodes so the normal device-tree walking functions
* can be used.
+ *
+ * Returns NULL on failure or the memory chunk containing the unflattened
+ * device tree on success.
*/
-void of_fdt_unflatten_tree(const unsigned long *blob,
- struct device_node **mynodes)
+void *of_fdt_unflatten_tree(const unsigned long *blob,
+ struct device_node *dad,
+ struct device_node **mynodes)
{
+ void *mem;
+
mutex_lock(&of_fdt_unflatten_mutex);
- __unflatten_device_tree(blob, mynodes, &kernel_tree_alloc);
+ mem = __unflatten_device_tree(blob, dad, mynodes, &kernel_tree_alloc);
mutex_unlock(&of_fdt_unflatten_mutex);
+
+ return mem;
}
EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree);
* is set in which case we override whatever was found earlier.
*/
#ifdef CONFIG_CMDLINE
-#ifndef CONFIG_CMDLINE_FORCE
+#if defined(CONFIG_CMDLINE_EXTEND)
+ strlcat(data, " ", COMMAND_LINE_SIZE);
+ strlcat(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
+#elif defined(CONFIG_CMDLINE_FORCE)
+ strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
+#else
+ /* No arguments from boot loader, use kernel's cmdl*/
if (!((char *)data)[0])
-#endif
strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
+#endif
#endif /* CONFIG_CMDLINE */
pr_debug("Command line is: %s\n", (char*)data);
*/
void __init unflatten_device_tree(void)
{
- __unflatten_device_tree(initial_boot_params, &of_root,
+ __unflatten_device_tree(initial_boot_params, NULL, &of_root,
early_init_dt_alloc_memory_arch);
/* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */
projects / cascardo / linux.git / blobdiff