From patchwork Wed Oct 11 01:05:27 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dave Jiang X-Patchwork-Id: 13416494 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1BE4180D for ; Wed, 11 Oct 2023 01:05:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="H/5qNWPE" Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.126]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9311A92 for ; Tue, 10 Oct 2023 18:05:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1696986334; x=1728522334; h=subject:from:to:cc:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=bi0CevuUkg4bEOhHj2TAK8AMG2eLo29iczB+qNDwgRQ=; b=H/5qNWPEJLwdr4mmdm8ENV1xCuk5RRI4miSz5zvI/c3iL8yk2WUCHwXy Gg84IxUfA/xU3JyAOpxzNIb7C0iFPgpfCFk244Mx79GA5KV0iebN2Tzc2 wAWoI9tO/jInAO8L+ieipR6kMiH2HhbmhUhh7wqkeCZvFV+0S6rr9iuT6 ugJn8to6CwJTN+VnxQXpQLGiy2CZx7qUubE2bDl5CYeZagETpttVmCIBv osY1kDQ/svsXUiA8/IyU/2hMpNtTXX9M2jFzsfs+CgrW0ynNukyuWWmLR JfYklT2qZ1yfq22vO3lbwrOmYT3sL93AxjMS0+DdcDMaBJV3uWC7WKizY Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10859"; a="369615385" X-IronPort-AV: E=Sophos;i="6.03,214,1694761200"; d="scan'208";a="369615385" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Oct 2023 18:05:30 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10859"; a="897436932" X-IronPort-AV: E=Sophos;i="6.03,214,1694761200"; d="scan'208";a="897436932" Received: from djiang5-mobl3.amr.corp.intel.com (HELO [192.168.1.177]) ([10.212.35.251]) by fmsmga001-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Oct 2023 18:03:43 -0700 Subject: [PATCH v10 05/22] lib/firmware_table: tables: Add CDAT table parsing support From: Dave Jiang To: linux-cxl@vger.kernel.org Cc: "Rafael J. Wysocki" , Len Brown , Jonathan Cameron , "Rafael J. Wysocki" , dan.j.williams@intel.com, ira.weiny@intel.com, vishal.l.verma@intel.com, alison.schofield@intel.com, Jonathan.Cameron@huawei.com, dave@stgolabs.net Date: Tue, 10 Oct 2023 18:05:27 -0700 Message-ID: <169698632723.1991735.16766728491988997141.stgit@djiang5-mobl3> In-Reply-To: <169698612949.1991735.1140524325982776941.stgit@djiang5-mobl3> References: <169698612949.1991735.1140524325982776941.stgit@djiang5-mobl3> User-Agent: StGit/1.5 Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE, SPF_NONE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net The CDAT table is very similar to ACPI tables when it comes to sub-table and entry structures. The helper functions can be also used to parse the CDAT table. Add support to the helper functions to deal with an external CDAT table, and also handle the endieness since CDAT can be processed by a BE host. Export a function cdat_table_parse() for CXL driver to parse a CDAT table. In order to minimize ACPICA code changes, __force is being utilized to deal with the case of a big endian (BE) host parsing a CDAT. All CDAT data structure variables are being force casted to __leX as appropriate. Cc: Rafael J. Wysocki Cc: Len Brown Reviewed-by: Jonathan Cameron Signed-off-by: Dave Jiang Acked-by: Rafael J. Wysocki --- drivers/acpi/tables.c | 5 +++- include/linux/fw_table.h | 11 +++++++++ lib/fw_table.c | 54 +++++++++++++++++++++++++++++++++++++++++++--- 3 files changed, 64 insertions(+), 6 deletions(-) diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c index c1516337f668..b07f7d091d13 100644 --- a/drivers/acpi/tables.c +++ b/drivers/acpi/tables.c @@ -251,8 +251,9 @@ int __init_or_acpilib acpi_table_parse_entries_array( return -ENODEV; } - count = acpi_parse_entries_array(id, table_size, table_header, - proc, proc_num, max_entries); + count = acpi_parse_entries_array(id, table_size, + (union fw_table_header *)table_header, + proc, proc_num, max_entries); acpi_put_table(table_header); return count; diff --git a/include/linux/fw_table.h b/include/linux/fw_table.h index ff8fa58d5818..a97d368df520 100644 --- a/include/linux/fw_table.h +++ b/include/linux/fw_table.h @@ -28,16 +28,25 @@ struct acpi_subtable_proc { #include #include +union fw_table_header { + struct acpi_table_header acpi; + struct acpi_table_cdat cdat; +}; + union acpi_subtable_headers { struct acpi_subtable_header common; struct acpi_hmat_structure hmat; struct acpi_prmt_module_header prmt; struct acpi_cedt_header cedt; + struct acpi_cdat_header cdat; }; int acpi_parse_entries_array(char *id, unsigned long table_size, - struct acpi_table_header *table_header, + union fw_table_header *table_header, struct acpi_subtable_proc *proc, int proc_num, unsigned int max_entries); +int cdat_table_parse(enum acpi_cdat_type type, + acpi_tbl_entry_handler_arg handler_arg, void *arg, + struct acpi_table_cdat *table_header); #endif diff --git a/lib/fw_table.c b/lib/fw_table.c index e84bd0866e10..108f1db3f1a6 100644 --- a/lib/fw_table.c +++ b/lib/fw_table.c @@ -18,6 +18,7 @@ enum acpi_subtable_type { ACPI_SUBTABLE_HMAT, ACPI_SUBTABLE_PRMT, ACPI_SUBTABLE_CEDT, + CDAT_SUBTABLE, }; struct acpi_subtable_entry { @@ -37,6 +38,8 @@ acpi_get_entry_type(struct acpi_subtable_entry *entry) return 0; case ACPI_SUBTABLE_CEDT: return entry->hdr->cedt.type; + case CDAT_SUBTABLE: + return entry->hdr->cdat.type; } return 0; } @@ -53,6 +56,11 @@ acpi_get_entry_length(struct acpi_subtable_entry *entry) return entry->hdr->prmt.length; case ACPI_SUBTABLE_CEDT: return entry->hdr->cedt.length; + case CDAT_SUBTABLE: { + __le16 length = (__force __le16)entry->hdr->cdat.length; + + return le16_to_cpu(length); + } } return 0; } @@ -69,6 +77,8 @@ acpi_get_subtable_header_length(struct acpi_subtable_entry *entry) return sizeof(entry->hdr->prmt); case ACPI_SUBTABLE_CEDT: return sizeof(entry->hdr->cedt); + case CDAT_SUBTABLE: + return sizeof(entry->hdr->cdat); } return 0; } @@ -82,9 +92,24 @@ acpi_get_subtable_type(char *id) return ACPI_SUBTABLE_PRMT; if (strncmp(id, ACPI_SIG_CEDT, 4) == 0) return ACPI_SUBTABLE_CEDT; + if (strncmp(id, ACPI_SIG_CDAT, 4) == 0) + return CDAT_SUBTABLE; return ACPI_SUBTABLE_COMMON; } +static unsigned long __init_or_acpilib +acpi_table_get_length(enum acpi_subtable_type type, + union fw_table_header *header) +{ + if (type == CDAT_SUBTABLE) { + __le32 length = (__force __le32)header->cdat.length; + + return le32_to_cpu(length); + } + + return header->acpi.length; +} + static __init_or_acpilib bool has_handler(struct acpi_subtable_proc *proc) { return proc->handler || proc->handler_arg; @@ -126,21 +151,24 @@ static __init_or_acpilib int call_handler(struct acpi_subtable_proc *proc, */ int __init_or_acpilib acpi_parse_entries_array(char *id, unsigned long table_size, - struct acpi_table_header *table_header, + union fw_table_header *table_header, struct acpi_subtable_proc *proc, int proc_num, unsigned int max_entries) { unsigned long table_end, subtable_len, entry_len; struct acpi_subtable_entry entry; + enum acpi_subtable_type type; int count = 0; int errs = 0; int i; - table_end = (unsigned long)table_header + table_header->length; + type = acpi_get_subtable_type(id); + table_end = (unsigned long)table_header + + acpi_table_get_length(type, table_header); /* Parse all entries looking for a match. */ - entry.type = acpi_get_subtable_type(id); + entry.type = type; entry.hdr = (union acpi_subtable_headers *) ((unsigned long)table_header + table_size); subtable_len = acpi_get_subtable_header_length(&entry); @@ -187,3 +215,23 @@ acpi_parse_entries_array(char *id, unsigned long table_size, return errs ? -EINVAL : count; } EXPORT_SYMBOL_GPL(acpi_parse_entries_array); + +int cdat_table_parse(enum acpi_cdat_type type, + acpi_tbl_entry_handler_arg handler_arg, void *arg, + struct acpi_table_cdat *table_header) +{ + struct acpi_subtable_proc proc = { + .id = type, + .handler_arg = handler_arg, + .arg = arg, + }; + + if (!table_header) + return -EINVAL; + + return acpi_parse_entries_array(ACPI_SIG_CDAT, + sizeof(struct acpi_table_cdat), + (union fw_table_header *)table_header, + &proc, 1, 0); +} +EXPORT_SYMBOL_NS_GPL(cdat_table_parse, CXL);