From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f200.google.com (mail-pf0-f200.google.com [209.85.192.200]) by kanga.kvack.org (Postfix) with ESMTP id E085B6B025E for ; Wed, 13 Dec 2017 21:10:32 -0500 (EST) Received: by mail-pf0-f200.google.com with SMTP id n6so3197856pfg.19 for ; Wed, 13 Dec 2017 18:10:32 -0800 (PST) Received: from mga11.intel.com (mga11.intel.com. [192.55.52.93]) by mx.google.com with ESMTPS id e69si2358748pfc.337.2017.12.13.18.10.31 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 13 Dec 2017 18:10:31 -0800 (PST) From: Ross Zwisler Subject: [PATCH v3 1/3] acpi: HMAT support in acpi_parse_entries_array() Date: Wed, 13 Dec 2017 19:10:17 -0700 Message-Id: <20171214021019.13579-2-ross.zwisler@linux.intel.com> In-Reply-To: <20171214021019.13579-1-ross.zwisler@linux.intel.com> References: <20171214021019.13579-1-ross.zwisler@linux.intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-kernel@vger.kernel.org Cc: Ross Zwisler , "Anaczkowski, Lukasz" , "Box, David E" , "Kogut, Jaroslaw" , "Koss, Marcin" , "Koziej, Artur" , "Lahtinen, Joonas" , "Moore, Robert" , "Nachimuthu, Murugasamy" , "Odzioba, Lukasz" , "Rafael J. Wysocki" , "Rafael J. Wysocki" , "Schmauss, Erik" , "Verma, Vishal L" , "Zheng, Lv" , Andrew Morton , Balbir Singh , Brice Goglin , Dan Williams , Dave Hansen , Jerome Glisse , John Hubbard , Len Brown , Tim Chen , devel@acpica.org, linux-acpi@vger.kernel.org, linux-mm@kvack.org, linux-nvdimm@lists.01.org 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 --- 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. 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