From: Ross Zwisler <ross.zwisler@linux.intel.com>
To: linux-kernel@vger.kernel.org
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>,
"Anaczkowski, Lukasz" <lukasz.anaczkowski@intel.com>,
"Box, David E" <david.e.box@intel.com>,
"Kogut, Jaroslaw" <Jaroslaw.Kogut@intel.com>,
"Koss, Marcin" <marcin.koss@intel.com>,
"Koziej, Artur" <artur.koziej@intel.com>,
"Lahtinen, Joonas" <joonas.lahtinen@intel.com>,
"Moore, Robert" <robert.moore@intel.com>,
"Nachimuthu, Murugasamy" <murugasamy.nachimuthu@intel.com>,
"Odzioba, Lukasz" <lukasz.odzioba@intel.com>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
"Schmauss, Erik" <erik.schmauss@intel.com>,
"Verma, Vishal L" <vishal.l.verma@intel.com>,
"Zheng, Lv" <lv.zheng@intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Balbir Singh <bsingharora@gmail.com>,
Brice Goglin <brice.goglin@gmail.com>,
Dan Williams <dan.j.williams@intel.com>,
Dave Hansen <dave.hansen@intel.com>,
Jerome Glisse <jglisse@redhat.com>,
John Hubbard <jhubbard@nvidia.com>, Len Brown <lenb@kernel.org>,
Tim Chen <tim.c.chen@linux.intel.com>,
devel@acpica.org, linux-acpi@vger.kernel.org, linux-mm@kvack.org,
linux-nvdimm@lists.01.org
Subject: [PATCH v3 1/3] acpi: HMAT support in acpi_parse_entries_array()
Date: Wed, 13 Dec 2017 19:10:17 -0700 [thread overview]
Message-ID: <20171214021019.13579-2-ross.zwisler@linux.intel.com> (raw)
In-Reply-To: <20171214021019.13579-1-ross.zwisler@linux.intel.com>
The current implementation of acpi_parse_entries_array() assumes that each
subtable has a standard ACPI subtable entry of type struct
acpi_subtable_header. This standard subtable header has a one byte length
followed by a one byte type.
The HMAT subtables have to allow for a longer length so they have subtable
headers of type struct acpi_hmat_structure which has a 2 byte type and a 4
byte length.
Enhance the subtable parsing in acpi_parse_entries_array() so that it can
handle these new HMAT subtables.
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
---
drivers/acpi/tables.c | 52 ++++++++++++++++++++++++++++++++++++++++-----------
1 file changed, 41 insertions(+), 11 deletions(-)
diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index 80ce2a7d224b..f777b94c234a 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -218,6 +218,33 @@ void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
}
}
+static unsigned long __init
+acpi_get_entry_type(char *id, void *entry)
+{
+ if (strncmp(id, ACPI_SIG_HMAT, 4) == 0)
+ return ((struct acpi_hmat_structure *)entry)->type;
+ else
+ return ((struct acpi_subtable_header *)entry)->type;
+}
+
+static unsigned long __init
+acpi_get_entry_length(char *id, void *entry)
+{
+ if (strncmp(id, ACPI_SIG_HMAT, 4) == 0)
+ return ((struct acpi_hmat_structure *)entry)->length;
+ else
+ return ((struct acpi_subtable_header *)entry)->length;
+}
+
+static unsigned long __init
+acpi_get_subtable_header_length(char *id)
+{
+ if (strncmp(id, ACPI_SIG_HMAT, 4) == 0)
+ return sizeof(struct acpi_hmat_structure);
+ else
+ return sizeof(struct acpi_subtable_header);
+}
+
/**
* acpi_parse_entries_array - for each proc_num find a suitable subtable
*
@@ -242,10 +269,10 @@ acpi_parse_entries_array(char *id, unsigned long table_size,
struct acpi_subtable_proc *proc, int proc_num,
unsigned int max_entries)
{
- struct acpi_subtable_header *entry;
- unsigned long table_end;
+ unsigned long table_end, subtable_header_length;
int count = 0;
int errs = 0;
+ void *entry;
int i;
if (acpi_disabled)
@@ -263,19 +290,23 @@ acpi_parse_entries_array(char *id, unsigned long table_size,
}
table_end = (unsigned long)table_header + table_header->length;
+ subtable_header_length = acpi_get_subtable_header_length(id);
/* Parse all entries looking for a match. */
- entry = (struct acpi_subtable_header *)
- ((unsigned long)table_header + table_size);
+ entry = (void *)table_header + table_size;
+
+ while (((unsigned long)entry) + subtable_header_length < table_end) {
+ unsigned long entry_type, entry_length;
- while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) <
- table_end) {
if (max_entries && count >= max_entries)
break;
+ entry_type = acpi_get_entry_type(id, entry);
+ entry_length = acpi_get_entry_length(id, entry);
+
for (i = 0; i < proc_num; i++) {
- if (entry->type != proc[i].id)
+ if (entry_type != proc[i].id)
continue;
if (!proc[i].handler ||
(!errs && proc[i].handler(entry, table_end))) {
@@ -290,16 +321,15 @@ acpi_parse_entries_array(char *id, unsigned long table_size,
count++;
/*
- * If entry->length is 0, break from this loop to avoid
+ * If entry_length is 0, break from this loop to avoid
* infinite loop.
*/
- if (entry->length == 0) {
+ if (entry_length == 0) {
pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id);
return -EINVAL;
}
- entry = (struct acpi_subtable_header *)
- ((unsigned long)entry + entry->length);
+ entry += entry_length;
}
if (max_entries && count > max_entries) {
--
2.14.3
next prev parent reply other threads:[~2017-12-14 2:11 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-14 2:10 [PATCH v3 0/3] create sysfs representation of ACPI HMAT Ross Zwisler
2017-12-14 2:10 ` Ross Zwisler [this message]
2017-12-15 0:49 ` [PATCH v3 1/3] acpi: HMAT support in acpi_parse_entries_array() Rafael J. Wysocki
2017-12-15 1:10 ` Dan Williams
2017-12-16 1:53 ` Rafael J. Wysocki
2017-12-16 1:57 ` Dan Williams
2017-12-16 2:15 ` Rafael J. Wysocki
2017-12-14 2:10 ` [PATCH v3 2/3] hmat: add heterogeneous memory sysfs support Ross Zwisler
2017-12-15 0:52 ` Rafael J. Wysocki
2017-12-15 20:53 ` Ross Zwisler
2017-12-14 2:10 ` [PATCH v3 3/3] hmat: add performance attributes Ross Zwisler
2017-12-14 13:00 ` [PATCH v3 0/3] create sysfs representation of ACPI HMAT Michal Hocko
2017-12-18 20:35 ` Ross Zwisler
2017-12-20 16:41 ` Ross Zwisler
2017-12-21 13:18 ` Michal Hocko
2017-12-20 18:19 ` Matthew Wilcox
2017-12-20 20:22 ` Dave Hansen
2017-12-20 21:16 ` Matthew Wilcox
2017-12-20 21:24 ` Ross Zwisler
2017-12-20 22:29 ` Dan Williams
2017-12-20 22:41 ` Ross Zwisler
2017-12-21 20:31 ` Brice Goglin
2017-12-22 22:53 ` Dan Williams
2017-12-22 23:22 ` Ross Zwisler
2017-12-22 23:57 ` Dan Williams
2017-12-23 1:14 ` Rafael J. Wysocki
2017-12-27 9:10 ` Brice Goglin
2017-12-30 6:58 ` Matthew Wilcox
2017-12-30 9:19 ` Brice Goglin
2017-12-20 21:13 ` Ross Zwisler
2017-12-21 1:41 ` Elliott, Robert (Persistent Memory)
2017-12-22 21:46 ` Ross Zwisler
2017-12-21 12:50 ` Michael Ellerman
2017-12-22 3:09 ` Anshuman Khandual
2017-12-22 10:31 ` Kogut, Jaroslaw
2017-12-22 14:37 ` Anshuman Khandual
2017-12-22 17:13 ` Dave Hansen
2017-12-23 5:14 ` Anshuman Khandual
2017-12-22 22:13 ` Ross Zwisler
2017-12-23 6:56 ` Anshuman Khandual
2017-12-22 22:31 ` Ross Zwisler
2017-12-25 2:05 ` Liubo(OS Lab)
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