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Date: Mon, 15 Sep 2014 09:48:21 -0700 From: Grant Likely <grant.likely@...aro.org> To: Hanjun Guo <hanjun.guo@...aro.org>, Catalin Marinas <catalin.marinas@....com>, "Rafael J. Wysocki" <rjw@...ysocki.net>, Mark Rutland <mark.rutland@....com>, Olof Johansson <olof@...om.net>, Will Deacon <will.deacon@....com> Cc: Graeme Gregory <graeme.gregory@...aro.org>, Arnd Bergmann <arnd@...db.de>, Sudeep Holla <Sudeep.Holla@....com>, Jon Masters <jcm@...hat.com>, Jason Cooper <jason@...edaemon.net>, Marc Zyngier <marc.zyngier@....com>, Bjorn Helgaas <bhelgaas@...gle.com>, Daniel Lezcano <daniel.lezcano@...aro.org>, Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>, Robert Richter <rric@...nel.org>, Lv Zheng <lv.zheng@...el.com>, Robert Moore <robert.moore@...el.com>, Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>, Liviu Dudau <Liviu.Dudau@....com>, Randy Dunlap <rdunlap@...radead.org>, Charles.Garcia-Tobin@....com, linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, linaro-acpi@...ts.linaro.org, Ashwin Chaugule <ashwin.chaugule@...aro.org>, Tomasz Nowicki <tomasz.nowicki@...aro.org>, Hanjun Guo <hanjun.guo@...aro.org> Subject: Re: [PATCH v4 02/18] ACPI / table: Add new function to get table entries On Fri, 12 Sep 2014 22:00:00 +0800, Hanjun Guo <hanjun.guo@...aro.org> wrote: > From: Ashwin Chaugule <ashwin.chaugule@...aro.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@...aro.org> > Signed-off-by: Tomasz Nowicki <tomasz.nowicki@...aro.org> > Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org> Makes sense. Acked-by: Grant Likely <grant.likely@...aro.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 > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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