From patchwork Tue Jan 17 12:22:38 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sakari Ailus X-Patchwork-Id: 643443 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B96EAC63797 for ; Tue, 17 Jan 2023 12:22:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236569AbjAQMWU (ORCPT ); Tue, 17 Jan 2023 07:22:20 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51218 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236029AbjAQMWS (ORCPT ); Tue, 17 Jan 2023 07:22:18 -0500 Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 997FB2BF1D; Tue, 17 Jan 2023 04:22:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1673958137; x=1705494137; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=v6HAXFpRr7SLIA2JbdJvjY1F5UgFHWYeLcwaXQXAcK8=; b=dvwJ+B8c4RKqoVZr72FcYNemerF/mZ84mjgfS7PCi9FALecr8ugN5GrJ FaQAj3CQp+irDuvCTZRdNGhbrzofy61strfmezV+I6XpLZRQ6W1pToNB7 iK5zoaG36+U8GnB0JE8OUsrZZIP6vyviHCHsstWivqk8RwmSTzzeLYevZ NcEDPQZtjABXR7uy6hiQe5lG3syn3A9f/r4+ALQ441DLvC4zrgujEakr0 6huwYybSl/m40d2CaGwxEyA294maqvCojOvU/kZYuZDiysbJ9+9IBeQVP VGMcc8unJji3dTszEEh8PXIhYsG0/xYwePNPl6WXW8mMlzsRA4CIw7fNs A==; X-IronPort-AV: E=McAfee;i="6500,9779,10592"; a="410920106" X-IronPort-AV: E=Sophos;i="5.97,222,1669104000"; d="scan'208";a="410920106" Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2023 04:22:15 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10592"; a="727772033" X-IronPort-AV: E=Sophos;i="5.97,222,1669104000"; d="scan'208";a="727772033" Received: from punajuuri.fi.intel.com (HELO paasikivi.fi.intel.com) ([10.237.72.43]) by fmsmga004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jan 2023 04:22:14 -0800 Received: from punajuuri.localdomain (punajuuri.localdomain [192.168.240.130]) by paasikivi.fi.intel.com (Postfix) with ESMTP id C7CF52057F; Tue, 17 Jan 2023 14:22:11 +0200 (EET) Received: from sailus by punajuuri.localdomain with local (Exim 4.94.2) (envelope-from ) id 1pHkzE-00AgV9-I7; Tue, 17 Jan 2023 14:22:44 +0200 From: Sakari Ailus To: linux-acpi@vger.kernel.org Cc: rafael@kernel.org, linux-media@vger.kernel.org, andriy.shevchenko@linux.intel.com, heikki.krogerus@linux.intel.com Subject: [PATCH 2/8] ACPI: property: Parse _CRS CSI-2 descriptor Date: Tue, 17 Jan 2023 14:22:38 +0200 Message-Id: <20230117122244.2546597-3-sakari.ailus@linux.intel.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20230117122244.2546597-1-sakari.ailus@linux.intel.com> References: <20230117122244.2546597-1-sakari.ailus@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Parse newly added ACPI _CRS CSI-2 descriptor for CSI-2 and camera configuration. For now, only figure out where the descriptor is present in order to allow adding information from it to related devices. Signed-off-by: Sakari Ailus --- drivers/acpi/Makefile | 2 +- drivers/acpi/internal.h | 7 + drivers/acpi/mipi.c | 318 ++++++++++++++++++++++++++++++++++++++++ drivers/acpi/scan.c | 16 +- include/acpi/acpi_bus.h | 11 ++ 5 files changed, 349 insertions(+), 5 deletions(-) create mode 100644 drivers/acpi/mipi.c diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index a5b649e71ab1b..a98fa1bc15548 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -37,7 +37,7 @@ acpi-$(CONFIG_ACPI_SLEEP) += proc.o # ACPI Bus and Device Drivers # acpi-y += bus.o glue.o -acpi-y += scan.o +acpi-y += scan.o mipi.o acpi-y += resource.o acpi-y += acpi_processor.o acpi-y += processor_core.o diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h index ec584442fb298..1ec4aa92bf17a 100644 --- a/drivers/acpi/internal.h +++ b/drivers/acpi/internal.h @@ -282,4 +282,11 @@ void acpi_init_lpit(void); static inline void acpi_init_lpit(void) { } #endif +/*-------------------------------------------------------------------------- + ACPI and MIPI DisCo for Imaging conversion + -------------------------------------------------------------------------- */ + +void acpi_crs_csi2_swnodes_del_free(void); +void acpi_bus_scan_crs_csi2(acpi_handle handle); + #endif /* _ACPI_INTERNAL_H_ */ diff --git a/drivers/acpi/mipi.c b/drivers/acpi/mipi.c new file mode 100644 index 0000000000000..9701266bf5c67 --- /dev/null +++ b/drivers/acpi/mipi.c @@ -0,0 +1,318 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * MIPI DisCo for Imaging support. + * + * Copyright (C) 2022 Intel Corporation + */ + +#include +#include +#include +#include +#include +#include + +#include "internal.h" + +struct crs_csi2_swnodes { + struct list_head list; + acpi_handle handle; + struct acpi_device_software_nodes *ads; +}; + +static LIST_HEAD(crs_csi2_swnodes); + +static void crs_csi2_swnode_del_free(struct crs_csi2_swnodes *swnodes) +{ + list_del(&swnodes->list); + kfree(swnodes); +} + +void acpi_crs_csi2_swnodes_del_free(void) +{ + struct crs_csi2_swnodes *swnodes, *swnodes_tmp; + + list_for_each_entry_safe(swnodes, swnodes_tmp, &crs_csi2_swnodes, list) + crs_csi2_swnode_del_free(swnodes); +} + +struct crs_csi2_instance { + struct list_head list; + struct acpi_resource_csi2_serialbus csi2; + acpi_handle remote_handle; + char remote_name[]; +}; + +struct crs_csi2 { + struct list_head list; + acpi_handle handle; + struct list_head buses; +}; + +struct scan_check_crs_csi2_context { + struct list_head res_list; + acpi_handle handle; +}; + +static acpi_status scan_check_crs_csi2_instance(struct acpi_resource *res, + void *context) +{ + struct scan_check_crs_csi2_context *inst_context = context; + struct acpi_resource_csi2_serialbus *csi2; + struct crs_csi2_instance *inst; + acpi_handle remote_handle; + acpi_status status; + + if (res->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) + return AE_OK; + + csi2 = &res->data.csi2_serial_bus; + + if (csi2->type != ACPI_RESOURCE_SERIAL_TYPE_CSI2) + return AE_OK; + + if (!csi2->resource_source.string_length) { + acpi_handle_debug(inst_context->handle, + "invalid resource source string length\n"); + return AE_OK; + } + + status = acpi_get_handle(NULL, csi2->resource_source.string_ptr, + &remote_handle); + if (status != AE_OK) { + acpi_handle_warn(inst_context->handle, + "cannot get handle for %s\n", + csi2->resource_source.string_ptr); + return AE_OK; + } + + inst = kmalloc(struct_size(inst, remote_name, + csi2->resource_source.string_length), + GFP_KERNEL); + if (!inst) + return AE_OK; + + inst->csi2 = *csi2; + memcpy(inst->remote_name, csi2->resource_source.string_ptr, + csi2->resource_source.string_length); + inst->csi2.resource_source.string_ptr = inst->remote_name; + inst->remote_handle = remote_handle; + + list_add(&inst->list, &inst_context->res_list); + + return AE_OK; +} + +static acpi_status scan_check_crs_csi2(acpi_handle handle, u32 nesting_level, + void *context, void **ret) +{ + struct scan_check_crs_csi2_context inst_context = { + .handle = handle, + .res_list = LIST_HEAD_INIT(inst_context.res_list), + }; + struct list_head *list = context; + struct crs_csi2 *csi2; + + INIT_LIST_HEAD(&inst_context.res_list); + + acpi_walk_resources(handle, METHOD_NAME__CRS, + scan_check_crs_csi2_instance, &inst_context); + + if (list_empty(&inst_context.res_list)) + return AE_OK; + + csi2 = kmalloc(sizeof(*csi2), GFP_KERNEL); + if (!csi2) + return AE_OK; + + csi2->handle = handle; + list_replace(&inst_context.res_list, &csi2->buses); + list_add(&csi2->list, list); + + return AE_OK; +} + +struct acpi_handle_ref { + acpi_handle handle; + unsigned int count; +}; + +#define NO_CSI2_PORT (~1U) + +static int crs_handle_cmp(const void *__a, const void *__b) +{ + const struct acpi_handle_ref *a = __a, *b = __b; + + return a->handle < b->handle ? -1 : a->handle > b->handle; +} + +static void crs_csi2_release(struct list_head *crs_csi2_handles) +{ + struct crs_csi2 *csi2, *csi2_tmp; + + list_for_each_entry_safe(csi2, csi2_tmp, crs_csi2_handles, list) { + struct crs_csi2_instance *inst, *inst_tmp; + + list_for_each_entry_safe(inst, inst_tmp, &csi2->buses, list) { + list_del(&inst->list); + kfree(inst); + } + + list_del(&csi2->list); + kfree(csi2); + } +} + +/** + * acpi_bus_scan_crs_csi2 - Scan a device and its child devices for _CRS CSI-2 + * + * @handle: ACPI handle to scan + * + * This function does a number of things: + * + * 1. Scan an ACPI device and its children for _CRS CSI-2 instances. The + * instances are stored for later use. + * + * 2. Count how many references to other devices _CRS CSI-2 instances have in + * total. + * + * 3. Count the number of references to other devices for each _CRS CSI-2 + * instance. + * + * 4. Allocate memory for swnodes each ACPI device requires later on, and + * generate a list of such allocations. + * + * Note that struct acpi_device isn't available yet at this time. + * + * acpi_scan_lock in scan.c must be held when calling this function. + */ +void acpi_bus_scan_crs_csi2(acpi_handle handle) +{ + struct acpi_handle_ref *handle_refs; + struct acpi_handle_ref *this = NULL; + LIST_HEAD(crs_csi2_handles); + unsigned int handle_count = 0, this_count; + unsigned int curr = 0; + struct crs_csi2 *csi2; + + /* Collect the devices that have a _CRS CSI-2 resource */ + acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX, + scan_check_crs_csi2, NULL, &crs_csi2_handles, NULL); + + /* + * Figure out how much temporary storage we need for counting + * connections in each device. + */ + list_for_each_entry(csi2, &crs_csi2_handles, list) { + struct crs_csi2_instance *inst; + + handle_count++; + + list_for_each_entry(inst, &csi2->buses, list) + handle_count++; + } + + /* No handles? Bail out here. */ + if (!handle_count) + return; + + handle_refs = kcalloc(handle_count + 1, sizeof(*handle_refs), + GFP_KERNEL); + if (!handle_refs) { + acpi_handle_debug(handle, "no memory for %u handle refs\n", + handle_count + 1); + return; + } + + /* Associate handles to the number of references. */ + list_for_each_entry(csi2, &crs_csi2_handles, list) { + struct crs_csi2_instance *inst; + struct acpi_handle_ref *handle_ref; + + handle_ref = &handle_refs[curr++]; + handle_ref->handle = csi2->handle; + + list_for_each_entry(inst, &csi2->buses, list) { + handle_refs[curr].handle = inst->remote_handle; + handle_refs[curr].count = 1; + handle_ref->count++; + curr++; + } + } + + handle_refs[curr].handle = NULL; + + sort(handle_refs, handle_count, sizeof(*handle_refs), crs_handle_cmp, + NULL); + + /* + * Finally count references in each handle, allocate space for device + * specific ports, properties and fill the _CRS CSI2 descriptor + * originated data. + */ + this = handle_refs; + this_count = this->count; + for (curr = 1; curr < handle_count + 1; curr++) { + struct acpi_device_software_nodes *ads; + struct crs_csi2_swnodes *swnodes; + size_t alloc_size; + void *end; + + if (this->handle == handle_refs[curr].handle) { + this_count += handle_refs[curr].count; + continue; + } + + /* + * Allocate memory for ports, node pointers (number of nodes + + * 1 (guardian), nodes (root + number of ports * 2 (for for + * every port there is an endpoint)). + */ + if (check_mul_overflow(sizeof(*ads->ports) + + sizeof(*ads->nodes) * 2 + + sizeof(*ads->nodeptrs) * 2, + (size_t)this_count, &alloc_size) || + check_add_overflow(sizeof(*ads) + sizeof(*ads->nodes) + + sizeof(*ads->nodeptrs) * 2, + alloc_size, &alloc_size)) { + acpi_handle_warn(handle, "too many handles (%u)", + this_count); + continue; + } + + swnodes = kzalloc(sizeof(*swnodes), GFP_KERNEL); + ads = kzalloc(alloc_size, GFP_KERNEL); + ads->ports = (void *)(ads + 1); + ads->nodes = (void *)(ads->ports + this_count); + ads->nodeptrs = (void *)(ads->nodes + + this_count * 2 + 1); + end = ads->nodeptrs + this_count * 2 + 2; + if (!swnodes || !ads || + WARN_ON((void *)ads + alloc_size != end)) { + kfree(swnodes); + kfree(ads); + acpi_handle_debug(handle, + "cannot allocate for %u swnodes\n", + this_count); + } else { + unsigned int i; + + ads->num_ports = this_count; + for (i = 0; i < this_count * 2 + 1; i++) + ads->nodeptrs[i] = &ads->nodes[i]; + ads->nodeptrs[i] = NULL; + for (i = 0; i < this_count; i++) + ads->ports[i].port_nr = NO_CSI2_PORT; + swnodes->handle = this->handle; + swnodes->ads = ads; + list_add(&swnodes->list, &crs_csi2_swnodes); + } + + this = &handle_refs[curr]; + this_count = this->count; + } + + kfree(handle_refs); + + crs_csi2_release(&crs_csi2_handles); +} diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 0c6f06abe3f47..50de874b8f208 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -2423,9 +2423,12 @@ EXPORT_SYMBOL_GPL(acpi_dev_get_next_consumer_dev); int acpi_bus_scan(acpi_handle handle) { struct acpi_device *device = NULL; + int ret = 0; acpi_bus_scan_second_pass = false; + acpi_bus_scan_crs_csi2(handle); + /* Pass 1: Avoid enumerating devices with missing dependencies. */ if (ACPI_SUCCESS(acpi_bus_check_add(handle, true, &device))) @@ -2433,13 +2436,15 @@ int acpi_bus_scan(acpi_handle handle) acpi_bus_check_add_1, NULL, NULL, (void **)&device); - if (!device) - return -ENODEV; + if (!device) { + ret = -ENODEV; + goto out_release; + } acpi_bus_attach(device, (void *)true); if (!acpi_bus_scan_second_pass) - return 0; + goto out_release; /* Pass 2: Enumerate all of the remaining devices. */ @@ -2452,7 +2457,10 @@ int acpi_bus_scan(acpi_handle handle) acpi_bus_attach(device, NULL); - return 0; +out_release: + acpi_crs_csi2_swnodes_del_free(); + + return ret; } EXPORT_SYMBOL(acpi_bus_scan); diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index e44be31115a67..a05fe22c1175c 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -360,6 +360,17 @@ struct acpi_device_data { struct acpi_gpio_mapping; +struct acpi_device_software_node_port { + unsigned int port_nr; +}; + +struct acpi_device_software_nodes { + struct acpi_device_software_node_port *ports; + struct software_node *nodes; + const struct software_node **nodeptrs; + unsigned int num_ports; +}; + /* Device */ struct acpi_device { u32 pld_crc;