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checks.c
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/* * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation. 2007. * * * 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. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 * USA */ #include "dtc.h" #ifdef TRACE_CHECKS #define TRACE(c, ...) \ do { \ fprintf(stderr, "=== %s: ", (c)->name); \ fprintf(stderr, __VA_ARGS__); \ fprintf(stderr, "\n"); \ } while (0) #else #define TRACE(c, fmt, ...) do { } while (0) #endif enum checkstatus { UNCHECKED = 0, PREREQ, PASSED, FAILED, }; struct check; typedef void (*tree_check_fn)(struct check *c, struct node *dt); typedef void (*node_check_fn)(struct check *c, struct node *dt, struct node *node); typedef void (*prop_check_fn)(struct check *c, struct node *dt, struct node *node, struct property *prop); struct check { const char *name; tree_check_fn tree_fn; node_check_fn node_fn; prop_check_fn prop_fn; void *data; bool warn, error; enum checkstatus status; bool inprogress; int num_prereqs; struct check **prereq; }; #define CHECK_ENTRY(nm, tfn, nfn, pfn, d, w, e, ...) \ static struct check *nm##_prereqs[] = { __VA_ARGS__ }; \ static struct check nm = { \ .name = #nm, \ .tree_fn = (tfn), \ .node_fn = (nfn), \ .prop_fn = (pfn), \ .data = (d), \ .warn = (w), \ .error = (e), \ .status = UNCHECKED, \ .num_prereqs = ARRAY_SIZE(nm##_prereqs), \ .prereq = nm##_prereqs, \ }; #define WARNING(nm, tfn, nfn, pfn, d, ...) \ CHECK_ENTRY(nm, tfn, nfn, pfn, d, true, false, __VA_ARGS__) #define ERROR(nm, tfn, nfn, pfn, d, ...) \ CHECK_ENTRY(nm, tfn, nfn, pfn, d, false, true, __VA_ARGS__) #define CHECK(nm, tfn, nfn, pfn, d, ...) \ CHECK_ENTRY(nm, tfn, nfn, pfn, d, false, false, __VA_ARGS__) #define TREE_WARNING(nm, d, ...) \ WARNING(nm, check_##nm, NULL, NULL, d, __VA_ARGS__) #define TREE_ERROR(nm, d, ...) \ ERROR(nm, check_##nm, NULL, NULL, d, __VA_ARGS__) #define TREE_CHECK(nm, d, ...) \ CHECK(nm, check_##nm, NULL, NULL, d, __VA_ARGS__) #define NODE_WARNING(nm, d, ...) \ WARNING(nm, NULL, check_##nm, NULL, d, __VA_ARGS__) #define NODE_ERROR(nm, d, ...) \ ERROR(nm, NULL, check_##nm, NULL, d, __VA_ARGS__) #define NODE_CHECK(nm, d, ...) \ CHECK(nm, NULL, check_##nm, NULL, d, __VA_ARGS__) #define PROP_WARNING(nm, d, ...) \ WARNING(nm, NULL, NULL, check_##nm, d, __VA_ARGS__) #define PROP_ERROR(nm, d, ...) \ ERROR(nm, NULL, NULL, check_##nm, d, __VA_ARGS__) #define PROP_CHECK(nm, d, ...) \ CHECK(nm, NULL, NULL, check_##nm, d, __VA_ARGS__) #ifdef __GNUC__ static inline void check_msg(struct check *c, const char *fmt, ...) __attribute__((format (printf, 2, 3))); #endif static inline void check_msg(struct check *c, const char *fmt, ...) { va_list ap; va_start(ap, fmt); if ((c->warn && (quiet < 1)) || (c->error && (quiet < 2))) { fprintf(stderr, "%s (%s): ", (c->error) ? "ERROR" : "Warning", c->name); vfprintf(stderr, fmt, ap); fprintf(stderr, "\n"); } va_end(ap); } #define FAIL(c, ...) \ do { \ TRACE((c), "\t\tFAILED at %s:%d", __FILE__, __LINE__); \ (c)->status = FAILED; \ check_msg((c), __VA_ARGS__); \ } while (0) static void check_nodes_props(struct check *c, struct node *dt, struct node *node) { struct node *child; struct property *prop; TRACE(c, "%s", node->fullpath); if (c->node_fn) c->node_fn(c, dt, node); if (c->prop_fn) for_each_property(node, prop) { TRACE(c, "%s\t'%s'", node->fullpath, prop->name); c->prop_fn(c, dt, node, prop); } for_each_child(node, child) check_nodes_props(c, dt, child); } static bool run_check(struct check *c, struct node *dt) { bool error = false; int i; assert(!c->inprogress); if (c->status != UNCHECKED) goto out; c->inprogress = true; for (i = 0; i < c->num_prereqs; i++) { struct check *prq = c->prereq[i]; error = error || run_check(prq, dt); if (prq->status != PASSED) { c->status = PREREQ; check_msg(c, "Failed prerequisite '%s'", c->prereq[i]->name); } } if (c->status != UNCHECKED) goto out; if (c->node_fn || c->prop_fn) check_nodes_props(c, dt, dt); if (c->tree_fn) c->tree_fn(c, dt); if (c->status == UNCHECKED) c->status = PASSED; TRACE(c, "\tCompleted, status %d", c->status); out: c->inprogress = false; if ((c->status != PASSED) && (c->error)) error = true; return error; } /* * Utility check functions */ /* A check which always fails, for testing purposes only */ static inline void check_always_fail(struct check *c, struct node *dt) { FAIL(c, "always_fail check"); } TREE_CHECK(always_fail, NULL); static void check_is_string(struct check *c, struct node *root, struct node *node) { struct property *prop; char *propname = c->data; prop = get_property(node, propname); if (!prop) return; /* Not present, assumed ok */ if (!data_is_one_string(prop->val)) FAIL(c, "\"%s\" property in %s is not a string", propname, node->fullpath); } #define WARNING_IF_NOT_STRING(nm, propname) \ WARNING(nm, NULL, check_is_string, NULL, (propname)) #define ERROR_IF_NOT_STRING(nm, propname) \ ERROR(nm, NULL, check_is_string, NULL, (propname)) static void check_is_cell(struct check *c, struct node *root, struct node *node) { struct property *prop; char *propname = c->data; prop = get_property(node, propname); if (!prop) return; /* Not present, assumed ok */ if (prop->val.len != sizeof(cell_t)) FAIL(c, "\"%s\" property in %s is not a single cell", propname, node->fullpath); } #define WARNING_IF_NOT_CELL(nm, propname) \ WARNING(nm, NULL, check_is_cell, NULL, (propname)) #define ERROR_IF_NOT_CELL(nm, propname) \ ERROR(nm, NULL, check_is_cell, NULL, (propname)) /* * Structural check functions */ static void check_duplicate_node_names(struct check *c, struct node *dt, struct node *node) { struct node *child, *child2; for_each_child(node, child) for (child2 = child->next_sibling; child2; child2 = child2->next_sibling) if (streq(child->name, child2->name)) FAIL(c, "Duplicate node name %s", child->fullpath); } NODE_ERROR(duplicate_node_names, NULL); static void check_duplicate_property_names(struct check *c, struct node *dt, struct node *node) { struct property *prop, *prop2; for_each_property(node, prop) { for (prop2 = prop->next; prop2; prop2 = prop2->next) { if (prop2->deleted) continue; if (streq(prop->name, prop2->name)) FAIL(c, "Duplicate property name %s in %s", prop->name, node->fullpath); } } } NODE_ERROR(duplicate_property_names, NULL); #define LOWERCASE "abcdefghijklmnopqrstuvwxyz" #define UPPERCASE "ABCDEFGHIJKLMNOPQRSTUVWXYZ" #define DIGITS "0123456789" #define PROPNODECHARS LOWERCASE UPPERCASE DIGITS ",._+*#?-" static void check_node_name_chars(struct check *c, struct node *dt, struct node *node) { int n = strspn(node->name, c->data); if (n < strlen(node->name)) FAIL(c, "Bad character '%c' in node %s", node->name[n], node->fullpath); } NODE_ERROR(node_name_chars, PROPNODECHARS "@"); static void check_node_name_format(struct check *c, struct node *dt, struct node *node) { if (strchr(get_unitname(node), '@')) FAIL(c, "Node %s has multiple '@' characters in name", node->fullpath); } NODE_ERROR(node_name_format, NULL, &node_name_chars); static void check_property_name_chars(struct check *c, struct node *dt, struct node *node, struct property *prop) { int n = strspn(prop->name, c->data); if (n < strlen(prop->name)) FAIL(c, "Bad character '%c' in property name \"%s\", node %s", prop->name[n], prop->name, node->fullpath); } PROP_ERROR(property_name_chars, PROPNODECHARS); #define DESCLABEL_FMT "%s%s%s%s%s" #define DESCLABEL_ARGS(node,prop,mark) \ ((mark) ? "value of " : ""), \ ((prop) ? "'" : ""), \ ((prop) ? (prop)->name : ""), \ ((prop) ? "' in " : ""), (node)->fullpath static void check_duplicate_label(struct check *c, struct node *dt, const char *label, struct node *node, struct property *prop, struct marker *mark) { struct node *othernode = NULL; struct property *otherprop = NULL; struct marker *othermark = NULL; othernode = get_node_by_label(dt, label); if (!othernode) otherprop = get_property_by_label(dt, label, &othernode); if (!othernode) othermark = get_marker_label(dt, label, &othernode, &otherprop); if (!othernode) return; if ((othernode != node) || (otherprop != prop) || (othermark != mark)) FAIL(c, "Duplicate label '%s' on " DESCLABEL_FMT " and " DESCLABEL_FMT, label, DESCLABEL_ARGS(node, prop, mark), DESCLABEL_ARGS(othernode, otherprop, othermark)); } static void check_duplicate_label_node(struct check *c, struct node *dt, struct node *node) { struct label *l; for_each_label(node->labels, l) check_duplicate_label(c, dt, l->label, node, NULL, NULL); } static void check_duplicate_label_prop(struct check *c, struct node *dt, struct node *node, struct property *prop) { struct marker *m = prop->val.markers; struct label *l; for_each_label(prop->labels, l) check_duplicate_label(c, dt, l->label, node, prop, NULL); for_each_marker_of_type(m, LABEL) check_duplicate_label(c, dt, m->ref, node, prop, m); } ERROR(duplicate_label, NULL, check_duplicate_label_node, check_duplicate_label_prop, NULL); static void check_explicit_phandles(struct check *c, struct node *root, struct node *node, struct property *prop) { struct marker *m; struct node *other; cell_t phandle; if (!streq(prop->name, "phandle") && !streq(prop->name, "linux,phandle")) return; if (prop->val.len != sizeof(cell_t)) { FAIL(c, "%s has bad length (%d) %s property", node->fullpath, prop->val.len, prop->name); return; } m = prop->val.markers; for_each_marker_of_type(m, REF_PHANDLE) { assert(m->offset == 0); if (node != get_node_by_ref(root, m->ref)) /* "Set this node's phandle equal to some * other node's phandle". That's nonsensical * by construction. */ { FAIL(c, "%s in %s is a reference to another node", prop->name, node->fullpath); return; } /* But setting this node's phandle equal to its own * phandle is allowed - that means allocate a unique * phandle for this node, even if it's not otherwise * referenced. The value will be filled in later, so * no further checking for now. */ return; } phandle = propval_cell(prop); if ((phandle == 0) || (phandle == -1)) { FAIL(c, "%s has bad value (0x%x) in %s property", node->fullpath, phandle, prop->name); return; } if (node->phandle && (node->phandle != phandle)) FAIL(c, "%s has %s property which replaces existing phandle information", node->fullpath, prop->name); other = get_node_by_phandle(root, phandle); if (other && (other != node)) { FAIL(c, "%s has duplicated phandle 0x%x (seen before at %s)", node->fullpath, phandle, other->fullpath); return; } node->phandle = phandle; } PROP_ERROR(explicit_phandles, NULL); static void check_name_properties(struct check *c, struct node *root, struct node *node) { struct property **pp, *prop = NULL; for (pp = &node->proplist; *pp; pp = &((*pp)->next)) if (streq((*pp)->name, "name")) { prop = *pp; break; } if (!prop) return; /* No name property, that's fine */ if ((prop->val.len != node->basenamelen+1) || (memcmp(prop->val.val, node->name, node->basenamelen) != 0)) { FAIL(c, "\"name\" property in %s is incorrect (\"%s\" instead" " of base node name)", node->fullpath, prop->val.val); } else { /* The name property is correct, and therefore redundant. * Delete it */ *pp = prop->next; free(prop->name); data_free(prop->val); free(prop); } } ERROR_IF_NOT_STRING(name_is_string, "name"); NODE_ERROR(name_properties, NULL, &name_is_string); /* * Reference fixup functions */ static void fixup_phandle_references(struct check *c, struct node *dt, struct node *node, struct property *prop) { struct marker *m = prop->val.markers; struct node *refnode; cell_t phandle; 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) { FAIL(c, "Reference to non-existent node or label \"%s\"\n", m->ref); continue; } phandle = get_node_phandle(dt, refnode); *((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); static void fixup_path_references(struct check *c, struct node *dt, struct node *node, struct property *prop) { struct marker *m = prop->val.markers; struct node *refnode; char *path; for_each_marker_of_type(m, REF_PATH) { assert(m->offset <= prop->val.len); refnode = get_node_by_ref(dt, m->ref); if (!refnode) { FAIL(c, "Reference to non-existent node or label \"%s\"\n", m->ref); continue; } path = refnode->fullpath; prop->val = data_insert_at_marker(prop->val, m, path, strlen(path) + 1); } } ERROR(path_references, NULL, NULL, fixup_path_references, NULL, &duplicate_node_names); /* * Semantic checks */ WARNING_IF_NOT_CELL(address_cells_is_cell, "#address-cells"); WARNING_IF_NOT_CELL(size_cells_is_cell, "#size-cells"); WARNING_IF_NOT_CELL(interrupt_cells_is_cell, "#interrupt-cells"); WARNING_IF_NOT_STRING(device_type_is_string, "device_type"); WARNING_IF_NOT_STRING(model_is_string, "model"); WARNING_IF_NOT_STRING(status_is_string, "status"); static void fixup_addr_size_cells(struct check *c, struct node *dt, struct node *node) { struct property *prop; node->addr_cells = -1; node->size_cells = -1; prop = get_property(node, "#address-cells"); if (prop) node->addr_cells = propval_cell(prop); prop = get_property(node, "#size-cells"); if (prop) node->size_cells = propval_cell(prop); } WARNING(addr_size_cells, NULL, fixup_addr_size_cells, NULL, NULL, &address_cells_is_cell, &size_cells_is_cell); #define node_addr_cells(n) \ (((n)->addr_cells == -1) ? 2 : (n)->addr_cells) #define node_size_cells(n) \ (((n)->size_cells == -1) ? 1 : (n)->size_cells) static void check_reg_format(struct check *c, struct node *dt, struct node *node) { struct property *prop; int addr_cells, size_cells, entrylen; prop = get_property(node, "reg"); if (!prop) return; /* No "reg", that's fine */ if (!node->parent) { FAIL(c, "Root node has a \"reg\" property"); return; } if (prop->val.len == 0) FAIL(c, "\"reg\" property in %s is empty", node->fullpath); addr_cells = node_addr_cells(node->parent); size_cells = node_size_cells(node->parent); entrylen = (addr_cells + size_cells) * sizeof(cell_t); if ((prop->val.len % entrylen) != 0) FAIL(c, "\"reg\" property in %s has invalid length (%d bytes) " "(#address-cells == %d, #size-cells == %d)", node->fullpath, prop->val.len, addr_cells, size_cells); } NODE_WARNING(reg_format, NULL, &addr_size_cells); static void check_ranges_format(struct check *c, struct node *dt, struct node *node) { struct property *prop; int c_addr_cells, p_addr_cells, c_size_cells, p_size_cells, entrylen; prop = get_property(node, "ranges"); if (!prop) return; if (!node->parent) { FAIL(c, "Root node has a \"ranges\" property"); return; } p_addr_cells = node_addr_cells(node->parent); p_size_cells = node_size_cells(node->parent); c_addr_cells = node_addr_cells(node); c_size_cells = node_size_cells(node); entrylen = (p_addr_cells + c_addr_cells + c_size_cells) * sizeof(cell_t); if (prop->val.len == 0) { if (p_addr_cells != c_addr_cells) FAIL(c, "%s has empty \"ranges\" property but its " "#address-cells (%d) differs from %s (%d)", node->fullpath, c_addr_cells, node->parent->fullpath, p_addr_cells); if (p_size_cells != c_size_cells) FAIL(c, "%s has empty \"ranges\" property but its " "#size-cells (%d) differs from %s (%d)", node->fullpath, c_size_cells, node->parent->fullpath, p_size_cells); } else if ((prop->val.len % entrylen) != 0) { FAIL(c, "\"ranges\" property in %s has invalid length (%d bytes) " "(parent #address-cells == %d, child #address-cells == %d, " "#size-cells == %d)", node->fullpath, prop->val.len, p_addr_cells, c_addr_cells, c_size_cells); } } NODE_WARNING(ranges_format, NULL, &addr_size_cells); /* * Style checks */ static void check_avoid_default_addr_size(struct check *c, struct node *dt, struct node *node) { struct property *reg, *ranges; if (!node->parent) return; /* Ignore root node */ reg = get_property(node, "reg"); ranges = get_property(node, "ranges"); if (!reg && !ranges) return; if (node->parent->addr_cells == -1) FAIL(c, "Relying on default #address-cells value for %s", node->fullpath); if (node->parent->size_cells == -1) FAIL(c, "Relying on default #size-cells value for %s", node->fullpath); } NODE_WARNING(avoid_default_addr_size, NULL, &addr_size_cells); static void check_obsolete_chosen_interrupt_controller(struct check *c, struct node *dt) { struct node *chosen; struct property *prop; chosen = get_node_by_path(dt, "/chosen"); if (!chosen) return; prop = get_property(chosen, "interrupt-controller"); if (prop) FAIL(c, "/chosen has obsolete \"interrupt-controller\" " "property"); } TREE_WARNING(obsolete_chosen_interrupt_controller, NULL); static struct check *check_table[] = { &duplicate_node_names, &duplicate_property_names, &node_name_chars, &node_name_format, &property_name_chars, &name_is_string, &name_properties, &duplicate_label, &explicit_phandles, &phandle_references, &path_references, &address_cells_is_cell, &size_cells_is_cell, &interrupt_cells_is_cell, &device_type_is_string, &model_is_string, &status_is_string, &addr_size_cells, ®_format, &ranges_format, &avoid_default_addr_size, &obsolete_chosen_interrupt_controller, &always_fail, }; static void enable_warning_error(struct check *c, bool warn, bool error) { int i; /* Raising level, also raise it for prereqs */ if ((warn && !c->warn) || (error && !c->error)) for (i = 0; i < c->num_prereqs; i++) enable_warning_error(c->prereq[i], warn, error); c->warn = c->warn || warn; c->error = c->error || error; } static void disable_warning_error(struct check *c, bool warn, bool error) { int i; /* Lowering level, also lower it for things this is the prereq * for */ if ((warn && c->warn) || (error && c->error)) { for (i = 0; i < ARRAY_SIZE(check_table); i++) { struct check *cc = check_table[i]; int j; for (j = 0; j < cc->num_prereqs; j++) if (cc->prereq[j] == c) disable_warning_error(cc, warn, error); } } c->warn = c->warn && !warn; c->error = c->error && !error; } void parse_checks_option(bool warn, bool error, const char *arg) { int i; const char *name = arg; bool enable = true; if ((strncmp(arg, "no-", 3) == 0) || (strncmp(arg, "no_", 3) == 0)) { name = arg + 3; enable = false; } for (i = 0; i < ARRAY_SIZE(check_table); i++) { struct check *c = check_table[i]; if (streq(c->name, name)) { if (enable) enable_warning_error(c, warn, error); else disable_warning_error(c, warn, error); return; } } die("Unrecognized check name \"%s\"\n", name); } void process_checks(bool force, struct boot_info *bi) { struct node *dt = bi->dt; int i; int error = 0; for (i = 0; i < ARRAY_SIZE(check_table); i++) { struct check *c = check_table[i]; if (c->warn || c->error) error = error || run_check(c, dt); } if (error) { if (!force) { fprintf(stderr, "ERROR: Input tree has errors, aborting " "(use -f to force output)\n"); exit(2); } else if (quiet < 3) { fprintf(stderr, "Warning: Input tree has errors, " "output forced\n"); } } }