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PKGBUILDs/alarm/dtc-overlay/dtc-dynamic-symbols-fixup-support.patch

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From 61c5cdfd8e611d3a34497394098555b0b8644a31 Mon Sep 17 00:00:00 2001
From: Pantelis Antoniou <panto@antoniou-consulting.com>
Date: Fri, 4 Jan 2013 21:16:21 +0200
Subject: [PATCH] dtc: Dynamic symbols & fixup support
Enable the generation of symbol & fixup information for
usage with dynamic DT loading.
Passing the -@ option generates a __symbols__ node at the
root node of the resulting blob for any node labels used.
When using the /plugin/ tag all unresolved label references
be tracked in the __fixups__ node, while all local phandle
references will the tracked in the __local_fixups__ node.
This is sufficient to implement a dynamic DT object loader.
Signed-off-by: Pantelis Antoniou <panto@antoniou-consulting.com>
Signed-off-by: Stefan Agner <stefan@agner.ch>
---
Documentation/dts-format.txt | 7 +++
Documentation/manual.txt | 8 +++
checks.c | 120 +++++++++++++++++++++++++++++++++++--
dtc-lexer.l | 5 ++
dtc-parser.y | 23 ++++++-
dtc.c | 9 ++-
dtc.h | 38 ++++++++++++
flattree.c | 139 +++++++++++++++++++++++++++++++++++++++++++
8 files changed, 340 insertions(+), 9 deletions(-)
diff --git a/Documentation/dts-format.txt b/Documentation/dts-format.txt
index 41741df..4da515c 100644
--- a/Documentation/dts-format.txt
+++ b/Documentation/dts-format.txt
@@ -115,7 +115,14 @@ Version 1 DTS files have the overall layout:
* C style (/* ... */) and C++ style (// ...) comments are supported.
+Device Tree Objects
+-------------------
+Using the plugin tag enables dynamic tree objects.
+
+ /plugin/;
+
+For the full details please see Documentation/dt-object-internal.txt
-- David Gibson <david@gibson.dropbear.id.au>
-- Yoder Stuart <stuart.yoder@freescale.com>
diff --git a/Documentation/manual.txt b/Documentation/manual.txt
index 65c8540..d313715 100644
--- a/Documentation/manual.txt
+++ b/Documentation/manual.txt
@@ -133,6 +133,14 @@ Options:
By default the most recent version is generated.
Relevant for dtb and asm output only.
+ -@
+ Dynamic resolution mode. For non /plugin/ compilations generate
+ a __symbols__ node containing a list of all nodes with a label.
+ When /plugin/ is used, unresolved references are recorded in
+ a __fixups__ node, while local phandle references are recorded
+ in a __local_fixups__ node.
+ See Documentation/dt-object-internal.txt
+
The <output_version> defines what version of the "blob" format will be
generated. Supported versions are 1, 2, 3, 16 and 17. The default is
diff --git a/checks.c b/checks.c
index ee96a25..970c0a3 100644
--- a/checks.c
+++ b/checks.c
@@ -457,22 +457,93 @@ static void fixup_phandle_references(struct check *c, struct node *dt,
struct node *node, struct property *prop)
{
struct marker *m = prop->val.markers;
+ struct fixup *f, **fp;
+ struct fixup_entry *fe, **fep;
struct node *refnode;
cell_t phandle;
+ int has_phandle_refs;
+
+ has_phandle_refs = 0;
+ for_each_marker_of_type(m, REF_PHANDLE) {
+ has_phandle_refs = 1;
+ break;
+ }
+
+ if (!has_phandle_refs)
+ return;
for_each_marker_of_type(m, REF_PHANDLE) {
assert(m->offset + sizeof(cell_t) <= prop->val.len);
refnode = get_node_by_ref(dt, m->ref);
- if (! refnode) {
+ if (!refnode && !symbol_fixup_support) {
FAIL(c, "Reference to non-existent node or label \"%s\"\n",
- m->ref);
+ m->ref);
continue;
}
- phandle = get_node_phandle(dt, refnode);
- *((cell_t *)(prop->val.val + m->offset)) = cpu_to_fdt32(phandle);
+ if (!refnode) {
+ /* allocate fixup entry */
+ fe = xmalloc(sizeof(*fe));
+
+ fe->node = node;
+ fe->prop = prop;
+ fe->offset = m->offset;
+ fe->next = NULL;
+
+ /* search for an already existing fixup */
+ for_each_fixup(dt, f)
+ if (strcmp(f->ref, m->ref) == 0)
+ break;
+
+ /* no fixup found, add new */
+ if (f == NULL) {
+ f = xmalloc(sizeof(*f));
+ f->ref = m->ref;
+ f->entries = NULL;
+ f->next = NULL;
+
+ /* add it to the tree */
+ fp = &dt->fixups;
+ while (*fp)
+ fp = &(*fp)->next;
+ *fp = f;
+ }
+
+ /* and now append fixup entry */
+ fep = &f->entries;
+ while (*fep)
+ fep = &(*fep)->next;
+ *fep = fe;
+
+ /* mark the entry as unresolved */
+ phandle = 0xdeadbeef;
+ } else {
+ phandle = get_node_phandle(dt, refnode);
+
+ /* if it's a plugin, we need to record it */
+ if (symbol_fixup_support && dt->is_plugin) {
+
+ /* allocate a new local fixup entry */
+ fe = xmalloc(sizeof(*fe));
+
+ fe->node = node;
+ fe->prop = prop;
+ fe->offset = m->offset;
+ fe->next = NULL;
+
+ /* append it to the local fixups */
+ fep = &dt->local_fixups;
+ while (*fep)
+ fep = &(*fep)->next;
+ *fep = fe;
+ }
+ }
+
+ *((cell_t *)(prop->val.val + m->offset)) =
+ cpu_to_fdt32(phandle);
}
+
}
ERROR(phandle_references, NULL, NULL, fixup_phandle_references, NULL,
&duplicate_node_names, &explicit_phandles);
@@ -651,6 +722,45 @@ static void check_obsolete_chosen_interrupt_controller(struct check *c,
}
TREE_WARNING(obsolete_chosen_interrupt_controller, NULL);
+static void check_auto_label_phandles(struct check *c, struct node *dt,
+ struct node *node)
+{
+ struct label *l;
+ struct symbol *s, **sp;
+ int has_label;
+
+ if (!symbol_fixup_support)
+ return;
+
+ has_label = 0;
+ for_each_label(node->labels, l) {
+ has_label = 1;
+ break;
+ }
+
+ if (!has_label)
+ return;
+
+ /* force allocation of a phandle for this node */
+ (void)get_node_phandle(dt, node);
+
+ /* add the symbol */
+ for_each_label(node->labels, l) {
+
+ s = xmalloc(sizeof(*s));
+ s->label = l;
+ s->node = node;
+ s->next = NULL;
+
+ /* add it to the symbols list */
+ sp = &dt->symbols;
+ while (*sp)
+ sp = &((*sp)->next);
+ *sp = s;
+ }
+}
+NODE_WARNING(auto_label_phandles, NULL);
+
static struct check *check_table[] = {
&duplicate_node_names, &duplicate_property_names,
&node_name_chars, &node_name_format, &property_name_chars,
@@ -669,6 +779,8 @@ static struct check *check_table[] = {
&avoid_default_addr_size,
&obsolete_chosen_interrupt_controller,
+ &auto_label_phandles,
+
&always_fail,
};
diff --git a/dtc-lexer.l b/dtc-lexer.l
index 3b41bfc..78d5132 100644
--- a/dtc-lexer.l
+++ b/dtc-lexer.l
@@ -112,6 +112,11 @@ static int pop_input_file(void);
return DT_V1;
}
+<*>"/plugin/" {
+ DPRINT("Keyword: /plugin/\n");
+ return DT_PLUGIN;
+ }
+
<*>"/memreserve/" {
DPRINT("Keyword: /memreserve/\n");
BEGIN_DEFAULT();
diff --git a/dtc-parser.y b/dtc-parser.y
index f412460..e444acf 100644
--- a/dtc-parser.y
+++ b/dtc-parser.y
@@ -20,6 +20,7 @@
%{
#include <stdio.h>
+#include <inttypes.h>
#include "dtc.h"
#include "srcpos.h"
@@ -56,9 +57,11 @@ static unsigned char eval_char_literal(const char *s);
struct node *nodelist;
struct reserve_info *re;
uint64_t integer;
+ int is_plugin;
}
%token DT_V1
+%token DT_PLUGIN
%token DT_MEMRESERVE
%token DT_LSHIFT DT_RSHIFT DT_LE DT_GE DT_EQ DT_NE DT_AND DT_OR
%token DT_BITS
@@ -76,6 +79,7 @@ static unsigned char eval_char_literal(const char *s);
%type <data> propdata
%type <data> propdataprefix
+%type <is_plugin> plugindecl
%type <re> memreserve
%type <re> memreserves
%type <array> arrayprefix
@@ -106,10 +110,23 @@ static unsigned char eval_char_literal(const char *s);
%%
sourcefile:
- DT_V1 ';' memreserves devicetree
+ DT_V1 ';' plugindecl memreserves devicetree
{
- the_boot_info = build_boot_info($3, $4,
- guess_boot_cpuid($4));
+ $5->is_plugin = $3;
+ $5->is_root = 1;
+ the_boot_info = build_boot_info($4, $5,
+ guess_boot_cpuid($5));
+ }
+ ;
+
+plugindecl:
+ /* empty */
+ {
+ $$ = 0;
+ }
+ | DT_PLUGIN ';'
+ {
+ $$ = 1;
}
;
diff --git a/dtc.c b/dtc.c
index e3c9653..d2f9647 100644
--- a/dtc.c
+++ b/dtc.c
@@ -29,6 +29,7 @@ int reservenum; /* Number of memory reservation slots */
int minsize; /* Minimum blob size */
int padsize; /* Additional padding to blob */
int phandle_format = PHANDLE_BOTH; /* Use linux,phandle or phandle properties */
+int symbol_fixup_support = 0;
static void fill_fullpaths(struct node *tree, const char *prefix)
{
@@ -49,7 +50,7 @@ static void fill_fullpaths(struct node *tree, const char *prefix)
/* Usage related data. */
static const char usage_synopsis[] = "dtc [options] <input file>";
-static const char usage_short_opts[] = "qI:O:o:V:d:R:S:p:fb:i:H:sW:E:hv";
+static const char usage_short_opts[] = "qI:O:o:V:d:R:S:p:fb:i:H:sW:E:hv:@";
static struct option const usage_long_opts[] = {
{"quiet", no_argument, NULL, 'q'},
{"in-format", a_argument, NULL, 'I'},
@@ -67,6 +68,7 @@ static struct option const usage_long_opts[] = {
{"phandle", a_argument, NULL, 'H'},
{"warning", a_argument, NULL, 'W'},
{"error", a_argument, NULL, 'E'},
+ {"symbols", a_argument, NULL, '@'},
{"help", no_argument, NULL, 'h'},
{"version", no_argument, NULL, 'v'},
{NULL, no_argument, NULL, 0x0},
@@ -97,6 +99,7 @@ static const char * const usage_opts_help[] = {
"\t\tboth - Both \"linux,phandle\" and \"phandle\" properties",
"\n\tEnable/disable warnings (prefix with \"no-\")",
"\n\tEnable/disable errors (prefix with \"no-\")",
+ "\n\tSymbols and Fixups support",
"\n\tPrint this help and exit",
"\n\tPrint version and exit",
NULL,
@@ -184,7 +187,9 @@ int main(int argc, char *argv[])
case 'E':
parse_checks_option(false, true, optarg);
break;
-
+ case '@':
+ symbol_fixup_support = 1;
+ break;
case 'h':
usage(NULL);
default:
diff --git a/dtc.h b/dtc.h
index 264a20c..8c9059b 100644
--- a/dtc.h
+++ b/dtc.h
@@ -54,6 +54,7 @@ extern int reservenum; /* Number of memory reservation slots */
extern int minsize; /* Minimum blob size */
extern int padsize; /* Additional padding to blob */
extern int phandle_format; /* Use linux,phandle or phandle properties */
+extern int symbol_fixup_support;/* enable symbols & fixup support */
#define PHANDLE_LEGACY 0x1
#define PHANDLE_EPAPR 0x2
@@ -132,6 +133,25 @@ struct label {
struct label *next;
};
+struct fixup_entry {
+ int offset;
+ struct node *node;
+ struct property *prop;
+ struct fixup_entry *next;
+};
+
+struct fixup {
+ char *ref;
+ struct fixup_entry *entries;
+ struct fixup *next;
+};
+
+struct symbol {
+ struct label *label;
+ struct node *node;
+ struct symbol *next;
+};
+
struct property {
int deleted;
char *name;
@@ -158,6 +178,12 @@ struct node {
int addr_cells, size_cells;
struct label *labels;
+
+ int is_root;
+ int is_plugin;
+ struct fixup *fixups;
+ struct symbol *symbols;
+ struct fixup_entry *local_fixups;
};
#define for_each_label_withdel(l0, l) \
@@ -181,6 +207,18 @@ struct node {
for_each_child_withdel(n, c) \
if (!(c)->deleted)
+#define for_each_fixup(n, f) \
+ for ((f) = (n)->fixups; (f); (f) = (f)->next)
+
+#define for_each_fixup_entry(f, fe) \
+ for ((fe) = (f)->entries; (fe); (fe) = (fe)->next)
+
+#define for_each_symbol(n, s) \
+ for ((s) = (n)->symbols; (s); (s) = (s)->next)
+
+#define for_each_local_fixup_entry(n, fe) \
+ for ((fe) = (n)->local_fixups; (fe); (fe) = (fe)->next)
+
void add_label(struct label **labels, char *label);
void delete_labels(struct label **labels);
diff --git a/flattree.c b/flattree.c
index 665dad7..6237715 100644
--- a/flattree.c
+++ b/flattree.c
@@ -262,6 +262,12 @@ static void flatten_tree(struct node *tree, struct emitter *emit,
struct property *prop;
struct node *child;
int seen_name_prop = 0;
+ struct symbol *sym;
+ struct fixup *f;
+ struct fixup_entry *fe;
+ char *name, *s;
+ const char *fullpath;
+ int namesz, nameoff, vallen;
if (tree->deleted)
return;
@@ -310,6 +316,139 @@ static void flatten_tree(struct node *tree, struct emitter *emit,
flatten_tree(child, emit, etarget, strbuf, vi);
}
+ if (!symbol_fixup_support)
+ goto no_symbols;
+
+ /* add the symbol nodes (if any) */
+ if (tree->symbols) {
+
+ emit->beginnode(etarget, NULL);
+ emit->string(etarget, "__symbols__", 0);
+ emit->align(etarget, sizeof(cell_t));
+
+ for_each_symbol(tree, sym) {
+
+ vallen = strlen(sym->node->fullpath);
+
+ nameoff = stringtable_insert(strbuf, sym->label->label);
+
+ emit->property(etarget, NULL);
+ emit->cell(etarget, vallen + 1);
+ emit->cell(etarget, nameoff);
+
+ if ((vi->flags & FTF_VARALIGN) && vallen >= 8)
+ emit->align(etarget, 8);
+
+ emit->string(etarget, sym->node->fullpath,
+ strlen(sym->node->fullpath));
+ emit->align(etarget, sizeof(cell_t));
+ }
+
+ emit->endnode(etarget, NULL);
+ }
+
+ /* add the fixup nodes */
+ if (tree->fixups) {
+
+ /* emit the external fixups */
+ emit->beginnode(etarget, NULL);
+ emit->string(etarget, "__fixups__", 0);
+ emit->align(etarget, sizeof(cell_t));
+
+ for_each_fixup(tree, f) {
+
+ namesz = 0;
+ for_each_fixup_entry(f, fe) {
+ fullpath = fe->node->fullpath;
+ if (fullpath[0] == '\0')
+ fullpath = "/";
+ namesz += strlen(fullpath) + 1;
+ namesz += strlen(fe->prop->name) + 1;
+ namesz += 32; /* space for :<number> + '\0' */
+ }
+
+ name = xmalloc(namesz);
+
+ s = name;
+ for_each_fixup_entry(f, fe) {
+ fullpath = fe->node->fullpath;
+ if (fullpath[0] == '\0')
+ fullpath = "/";
+ snprintf(s, name + namesz - s, "%s:%s:%d",
+ fullpath,
+ fe->prop->name, fe->offset);
+ s += strlen(s) + 1;
+ }
+
+ nameoff = stringtable_insert(strbuf, f->ref);
+ vallen = s - name - 1;
+
+ emit->property(etarget, NULL);
+ emit->cell(etarget, vallen + 1);
+ emit->cell(etarget, nameoff);
+
+ if ((vi->flags & FTF_VARALIGN) && vallen >= 8)
+ emit->align(etarget, 8);
+
+ emit->string(etarget, name, vallen);
+ emit->align(etarget, sizeof(cell_t));
+
+ free(name);
+ }
+
+ emit->endnode(etarget, tree->labels);
+ }
+
+ /* add the local fixup property */
+ if (tree->local_fixups) {
+
+ /* emit the external fixups */
+ emit->beginnode(etarget, NULL);
+ emit->string(etarget, "__local_fixups__", 0);
+ emit->align(etarget, sizeof(cell_t));
+
+ namesz = 0;
+ for_each_local_fixup_entry(tree, fe) {
+ fullpath = fe->node->fullpath;
+ if (fullpath[0] == '\0')
+ fullpath = "/";
+ namesz += strlen(fullpath) + 1;
+ namesz += strlen(fe->prop->name) + 1;
+ namesz += 32; /* space for :<number> + '\0' */
+ }
+
+ name = xmalloc(namesz);
+
+ s = name;
+ for_each_local_fixup_entry(tree, fe) {
+ fullpath = fe->node->fullpath;
+ if (fullpath[0] == '\0')
+ fullpath = "/";
+ snprintf(s, name + namesz - s, "%s:%s:%d",
+ fullpath, fe->prop->name,
+ fe->offset);
+ s += strlen(s) + 1;
+ }
+
+ nameoff = stringtable_insert(strbuf, "fixup");
+ vallen = s - name - 1;
+
+ emit->property(etarget, NULL);
+ emit->cell(etarget, vallen + 1);
+ emit->cell(etarget, nameoff);
+
+ if ((vi->flags & FTF_VARALIGN) && vallen >= 8)
+ emit->align(etarget, 8);
+
+ emit->string(etarget, name, vallen);
+ emit->align(etarget, sizeof(cell_t));
+
+ free(name);
+
+ emit->endnode(etarget, tree->labels);
+ }
+
+no_symbols:
emit->endnode(etarget, tree->labels);
}
--
1.8.3.1
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