| Message ID | 1410530416-30200-3-git-send-email-hanjun.guo@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Fri, 12 Sep 2014 22:00:00 +0800, Hanjun Guo <hanjun.guo@linaro.org> wrote: > From: Ashwin Chaugule <ashwin.chaugule@linaro.org> > > The acpi_table_parse() function has a callback that > passes a pointer to a table_header. Add a new function > which takes this pointer and parses its entries. This > eliminates the need to re-traverse all the tables for > each call. e.g. as in acpi_table_parse_madt() which is > normally called after acpi_table_parse(). > > Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> > Signed-off-by: Tomasz Nowicki <tomasz.nowicki@linaro.org> > Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org> Makes sense. Acked-by: Grant Likely <grant.likely@linaro.org> g. > --- > drivers/acpi/tables.c | 67 ++++++++++++++++++++++++++++++++++--------------- > include/linux/acpi.h | 4 +++ > 2 files changed, 51 insertions(+), 20 deletions(-) > > diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c > index 6d5a6cd..21ae521 100644 > --- a/drivers/acpi/tables.c > +++ b/drivers/acpi/tables.c > @@ -192,17 +192,14 @@ void acpi_table_print_madt_entry(struct acpi_subtable_header *header) > > > int __init > -acpi_table_parse_entries(char *id, > - unsigned long table_size, > - int entry_id, > - acpi_tbl_entry_handler handler, > - unsigned int max_entries) > +acpi_parse_entries(unsigned long table_size, > + acpi_tbl_entry_handler handler, > + struct acpi_table_header *table_header, > + int entry_id, unsigned int max_entries) > { > - struct acpi_table_header *table_header = NULL; > struct acpi_subtable_header *entry; > - unsigned int count = 0; > + int count = 0; > unsigned long table_end; > - acpi_size tbl_size; > > if (acpi_disabled) > return -ENODEV; > @@ -210,13 +207,11 @@ acpi_table_parse_entries(char *id, > if (!handler) > return -EINVAL; > > - if (strncmp(id, ACPI_SIG_MADT, 4) == 0) > - acpi_get_table_with_size(id, acpi_apic_instance, &table_header, &tbl_size); > - else > - acpi_get_table_with_size(id, 0, &table_header, &tbl_size); > + if (!table_size) > + return -EINVAL; > > if (!table_header) { > - pr_warn("%4.4s not present\n", id); > + pr_warn("Table header not present\n"); > return -ENODEV; > } > > @@ -232,30 +227,62 @@ acpi_table_parse_entries(char *id, > if (entry->type == entry_id > && (!max_entries || count++ < max_entries)) > if (handler(entry, table_end)) > - goto err; > + return -EINVAL; > > /* > * If entry->length is 0, break from this loop to avoid > * infinite loop. > */ > if (entry->length == 0) { > - pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, entry_id); > - goto err; > + pr_err("[0x%02x] Invalid zero length\n", entry_id); > + return -EINVAL; > } > > entry = (struct acpi_subtable_header *) > ((unsigned long)entry + entry->length); > } > + > if (max_entries && count > max_entries) { > pr_warn("[%4.4s:0x%02x] ignored %i entries of %i found\n", > - id, entry_id, count - max_entries, count); > + table_header->signature, entry_id, count - max_entries, > + count); > } > > - early_acpi_os_unmap_memory((char *)table_header, tbl_size); > return count; > -err: > +} > + > +int __init > +acpi_table_parse_entries(char *id, > + unsigned long table_size, > + int entry_id, > + acpi_tbl_entry_handler handler, > + unsigned int max_entries) > +{ > + struct acpi_table_header *table_header = NULL; > + acpi_size tbl_size; > + int count; > + > + if (acpi_disabled) > + return -ENODEV; > + > + if (!handler) > + return -EINVAL; > + > + if (strncmp(id, ACPI_SIG_MADT, 4) == 0) > + acpi_get_table_with_size(id, acpi_apic_instance, &table_header, &tbl_size); > + else > + acpi_get_table_with_size(id, 0, &table_header, &tbl_size); > + > + if (!table_header) { > + pr_warn("%4.4s not present\n", id); > + return -ENODEV; > + } > + > + count = acpi_parse_entries(table_size, handler, table_header, > + entry_id, max_entries); > + > early_acpi_os_unmap_memory((char *)table_header, tbl_size); > - return -EINVAL; > + return count; > } > > int __init > diff --git a/include/linux/acpi.h b/include/linux/acpi.h > index 807cbc4..36d5012 100644 > --- a/include/linux/acpi.h > +++ b/include/linux/acpi.h > @@ -123,6 +123,10 @@ int acpi_numa_init (void); > > int acpi_table_init (void); > int acpi_table_parse(char *id, acpi_tbl_table_handler handler); > +int __init acpi_parse_entries(unsigned long table_size, > + acpi_tbl_entry_handler handler, > + struct acpi_table_header *table_header, > + int entry_id, unsigned int max_entries); > int __init acpi_table_parse_entries(char *id, unsigned long table_size, > int entry_id, > acpi_tbl_entry_handler handler, > -- > 1.7.9.5 >
diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c index 6d5a6cd..21ae521 100644 --- a/drivers/acpi/tables.c +++ b/drivers/acpi/tables.c @@ -192,17 +192,14 @@ void acpi_table_print_madt_entry(struct acpi_subtable_header *header) int __init -acpi_table_parse_entries(char *id, - unsigned long table_size, - int entry_id, - acpi_tbl_entry_handler handler, - unsigned int max_entries) +acpi_parse_entries(unsigned long table_size, + acpi_tbl_entry_handler handler, + struct acpi_table_header *table_header, + int entry_id, unsigned int max_entries) { - struct acpi_table_header *table_header = NULL; struct acpi_subtable_header *entry; - unsigned int count = 0; + int count = 0; unsigned long table_end; - acpi_size tbl_size; if (acpi_disabled) return -ENODEV; @@ -210,13 +207,11 @@ acpi_table_parse_entries(char *id, if (!handler) return -EINVAL; - if (strncmp(id, ACPI_SIG_MADT, 4) == 0) - acpi_get_table_with_size(id, acpi_apic_instance, &table_header, &tbl_size); - else - acpi_get_table_with_size(id, 0, &table_header, &tbl_size); + if (!table_size) + return -EINVAL; if (!table_header) { - pr_warn("%4.4s not present\n", id); + pr_warn("Table header not present\n"); return -ENODEV; } @@ -232,30 +227,62 @@ acpi_table_parse_entries(char *id, if (entry->type == entry_id && (!max_entries || count++ < max_entries)) if (handler(entry, table_end)) - goto err; + return -EINVAL; /* * If entry->length is 0, break from this loop to avoid * infinite loop. */ if (entry->length == 0) { - pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, entry_id); - goto err; + pr_err("[0x%02x] Invalid zero length\n", entry_id); + return -EINVAL; } entry = (struct acpi_subtable_header *) ((unsigned long)entry + entry->length); } + if (max_entries && count > max_entries) { pr_warn("[%4.4s:0x%02x] ignored %i entries of %i found\n", - id, entry_id, count - max_entries, count); + table_header->signature, entry_id, count - max_entries, + count); } - early_acpi_os_unmap_memory((char *)table_header, tbl_size); return count; -err: +} + +int __init +acpi_table_parse_entries(char *id, + unsigned long table_size, + int entry_id, + acpi_tbl_entry_handler handler, + unsigned int max_entries) +{ + struct acpi_table_header *table_header = NULL; + acpi_size tbl_size; + int count; + + if (acpi_disabled) + return -ENODEV; + + if (!handler) + return -EINVAL; + + if (strncmp(id, ACPI_SIG_MADT, 4) == 0) + acpi_get_table_with_size(id, acpi_apic_instance, &table_header, &tbl_size); + else + acpi_get_table_with_size(id, 0, &table_header, &tbl_size); + + if (!table_header) { + pr_warn("%4.4s not present\n", id); + return -ENODEV; + } + + count = acpi_parse_entries(table_size, handler, table_header, + entry_id, max_entries); + early_acpi_os_unmap_memory((char *)table_header, tbl_size); - return -EINVAL; + return count; } int __init diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 807cbc4..36d5012 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -123,6 +123,10 @@ int acpi_numa_init (void); int acpi_table_init (void); int acpi_table_parse(char *id, acpi_tbl_table_handler handler); +int __init acpi_parse_entries(unsigned long table_size, + acpi_tbl_entry_handler handler, + struct acpi_table_header *table_header, + int entry_id, unsigned int max_entries); int __init acpi_table_parse_entries(char *id, unsigned long table_size, int entry_id, acpi_tbl_entry_handler handler,