From patchwork Wed Mar 29 10:09:44 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sakari Ailus X-Patchwork-Id: 668474 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 6B183C761A6 for ; Wed, 29 Mar 2023 10:10:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231481AbjC2KKI (ORCPT ); Wed, 29 Mar 2023 06:10:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47746 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231351AbjC2KKC (ORCPT ); Wed, 29 Mar 2023 06:10:02 -0400 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 41FF0DE; Wed, 29 Mar 2023 03:10:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1680084600; x=1711620600; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=uUpsHO+dWWF7hNHnC0EQaRYFZ8CokYy2tr/3LEI7FQg=; b=TNyEtIES+lX2HaC5nJRpf/5p73UQXajGJJ6A2k1DbwTd1zIa5e0z66zb 1D+Z6TCt2mQ4PVVUWJRmeAP+X0CqxtrfRiGC3EjCkbYtwQnrgRWL7v+uo 19OHDy217BAA5uPOL9A0r0DTLtuPe70DQ5MDjC/Qx3uW4ZkPcc0R1SYOq HVT+oU6GGbhtBJ8XJkn7IQjrxYA++qopVlOK58E7s6mpeWe2cXHQ1IJ3l pd2QTyWdLGrkPo8BBpBgSomskVQjcEcZR1H6FpGSrBiyGKNhhydJgykhs mQt/aK7/39MWkqmu/QP4WfhNULXHIsjfu7EjdlyZQTjf+ZSWA3JgzOXir Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10663"; a="343256231" X-IronPort-AV: E=Sophos;i="5.98,300,1673942400"; d="scan'208";a="343256231" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Mar 2023 03:09:59 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10663"; a="773517709" X-IronPort-AV: E=Sophos;i="5.98,300,1673942400"; d="scan'208";a="773517709" Received: from turnipsi.fi.intel.com (HELO kekkonen.fi.intel.com) ([10.237.72.44]) by fmsmga003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Mar 2023 03:09:58 -0700 Received: from svinhufvud.ger.corp.intel.com (localhost [IPv6:::1]) by kekkonen.fi.intel.com (Postfix) with ESMTP id 64DEF1227DF; Wed, 29 Mar 2023 13:09:55 +0300 (EEST) From: Sakari Ailus To: linux-acpi@vger.kernel.org Cc: linux-media@vger.kernel.org, rafael@kernel.org, andriy.shevchenko@linux.intel.com, heikki.krogerus@linux.intel.com Subject: [PATCH v8 03/10] ACPI: property: Parse _CRS CSI-2 descriptor Date: Wed, 29 Mar 2023 13:09:44 +0300 Message-Id: <20230329100951.1522322-4-sakari.ailus@linux.intel.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20230329100951.1522322-1-sakari.ailus@linux.intel.com> References: <20230329100951.1522322-1-sakari.ailus@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Parse newly added ACPI _CRS CSI-2 descriptor for CSI-2 and camera configuration, associate it with appropriate devices and allocate memory for software nodes needed to create a DT-like data structure for drivers. Signed-off-by: Sakari Ailus --- drivers/acpi/Makefile | 2 +- drivers/acpi/internal.h | 27 ++++ drivers/acpi/mipi.c | 343 ++++++++++++++++++++++++++++++++++++++++ drivers/acpi/scan.c | 50 ++++-- include/acpi/acpi_bus.h | 11 ++ 5 files changed, 418 insertions(+), 15 deletions(-) create mode 100644 drivers/acpi/mipi.c diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index a5b649e71ab1..a98fa1bc1554 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 06ad497067ac..aa5f9c69dbbe 100644 --- a/drivers/acpi/internal.h +++ b/drivers/acpi/internal.h @@ -102,6 +102,24 @@ struct acpi_device_bus_id { struct list_head node; }; +/* Context for scanning ACPI device nodes for _CRS CSI2 resource descriptors */ +struct acpi_scan_context_csi2 { + struct list_head crs_csi2_head; + size_t handle_count; +}; + +/** + * struct acpi_scan_context - Context for scanning ACPI devices + * @postponed_head: The list head of the postponed ACPI handles + * @device: The first encountered device, typically the root of the scanned tree + * @csi2: Context for scanning _CRS CSI2 resource descriptors + */ +struct acpi_scan_context { + struct list_head postponed_head; + struct acpi_device *device; + struct acpi_scan_context_csi2 csi2; +}; + void acpi_init_device_object(struct acpi_device *device, acpi_handle handle, int type, void (*release)(struct device *)); int acpi_tie_acpi_dev(struct acpi_device *adev); @@ -282,4 +300,13 @@ void acpi_init_lpit(void); static inline void acpi_init_lpit(void) { } #endif +/*-------------------------------------------------------------------------- + ACPI _CRS CSI2 and MIPI DisCo for Imaging conversion + -------------------------------------------------------------------------- */ + +void acpi_crs_csi2_swnodes_del_free(void); +void acpi_bus_scan_check_crs_csi2(acpi_handle handle, struct acpi_scan_context *ctx); +void acpi_bus_scan_crs_csi2_release(struct list_head *crs_csi2_handles); +void acpi_bus_scan_crs_csi2(struct acpi_scan_context_csi2 *ctx); + #endif /* _ACPI_INTERNAL_H_ */ diff --git a/drivers/acpi/mipi.c b/drivers/acpi/mipi.c new file mode 100644 index 000000000000..d719c879eb83 --- /dev/null +++ b/drivers/acpi/mipi.c @@ -0,0 +1,343 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * MIPI DisCo for Imaging support. + * + * Support MIPI DisCo for Imaging by parsing ACPI _CRS CSI2 records and DisCo + * for Imaging data structures. + * + * Also see . + * + * Copyright (C) 2023 Intel Corporation + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "internal.h" + +/* Temporary ACPI device handle to software node data structure mapping */ +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); +} + +/* + * Description of a _CRS CSI2 resource descriptor before software node creation + */ +struct crs_csi2_instance { + struct list_head list; + struct acpi_resource_csi2_serialbus csi2; + acpi_handle remote_handle; + char remote_name[]; +}; + +/* Temporary list of ACPI device nodes with _CRS CSI2 resource descriptors */ +struct crs_csi2 { + struct list_head list; + acpi_handle handle; + struct list_head buses; +}; + +/* + * Context for collecting _CRS CSI2 resource descriptors during ACPI namespace + * walk + */ +struct scan_check_crs_csi2_context { + struct list_head res_head; + acpi_handle handle; + size_t handle_count; +}; + +/* Scan a single CSI2 resource descriptor in _CRS. */ +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; + + 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; + } + + if (ACPI_FAILURE(acpi_get_handle(NULL, csi2->resource_source.string_ptr, + &remote_handle))) { + acpi_handle_warn(inst_context->handle, + "cannot get handle for %s\n", + csi2->resource_source.string_ptr); + return AE_OK; + } + + /* + * Allocate space to store the _CRS CSI2 entry and its data and add it + * to the list. + */ + inst = kmalloc(struct_size(inst, remote_name, csi2->resource_source.string_length), + GFP_KERNEL); + if (!inst) + return AE_OK; + + inst->csi2 = *csi2; + strscpy(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_head); + + inst_context->handle_count++; + + return AE_OK; +} + +/* + * Find all devices with _CRS CSI2 resource descriptors and collect them + * into a list for later use. + */ +void acpi_bus_scan_check_crs_csi2(acpi_handle handle, struct acpi_scan_context *ctx) +{ + struct scan_check_crs_csi2_context inst_context = { + .handle = handle, + .res_head = LIST_HEAD_INIT(inst_context.res_head), + }; + struct crs_csi2 *csi2; + + acpi_walk_resources(handle, METHOD_NAME__CRS, + scan_check_crs_csi2_instance, &inst_context); + + if (list_empty(&inst_context.res_head)) + return; + + /* + * Found entry, so allocate memory for it, fill it and add it to the + * list. + */ + csi2 = kmalloc(sizeof(*csi2), GFP_KERNEL); + if (!csi2) + return; /* There's nothing we really can do about this. */ + + csi2->handle = handle; + list_replace(&inst_context.res_head, &csi2->buses); + list_add(&csi2->list, &ctx->csi2.crs_csi2_head); + + /* This handle plus remote handles in _CRS CSI2 resource descriptors */ + ctx->csi2.handle_count += 1 + inst_context.handle_count; +} + +struct acpi_handle_ref { + acpi_handle handle; + unsigned int count; +}; + +#define NO_CSI2_PORT (UINT_MAX - 1) + +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; +} + +/* + * Release entries in temporary storage of ACPI device nodes with _CRS CSI2 + * resource descriptors. + */ +void acpi_bus_scan_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); + } +} + +/* + * Allocate memory and set up software nodes for an ACPI device with given + * number of CSI-2 ports. + */ +static void acpi_crs_csi2_alloc_fill_swnodes(size_t ports_count, acpi_handle handle) +{ + struct acpi_device_software_nodes *ads; + struct crs_csi2_swnodes *swnodes; + size_t alloc_size; + unsigned int i; + bool overflow; + void *end; + + /* + * Allocate memory for ports, node pointers (number of nodes + + * 1 (guardian), nodes (root + number of ports * 2 (because for + * every port there is an endpoint)). + */ + overflow = check_mul_overflow(sizeof(*ads->ports) + + sizeof(*ads->nodes) * 2 + + sizeof(*ads->nodeptrs) * 2, + ports_count, &alloc_size); + overflow = overflow || + check_add_overflow(sizeof(*ads) + sizeof(*ads->nodes) + + sizeof(*ads->nodeptrs) * 2, + alloc_size, &alloc_size); + if (overflow) { + acpi_handle_warn(handle, + "too many _CRS CSI2 resource handles (%zu)", + ports_count); + return; + } + + swnodes = kzalloc(sizeof(*swnodes), GFP_KERNEL); + ads = kmalloc(alloc_size, GFP_KERNEL); + if (!swnodes || !ads) + goto out_free; + + ads->ports = (void *)(ads + 1); + ads->nodes = (void *)(ads->ports + ports_count); + ads->nodeptrs = (void *)(ads->nodes + ports_count * 2 + 1); + end = ads->nodeptrs + ports_count * 2 + 2; + if (WARN_ON((void *)ads + alloc_size != end)) + goto out_free; + + ads->num_ports = ports_count; + for (i = 0; i < ports_count * 2 + 1; i++) + ads->nodeptrs[i] = &ads->nodes[i]; + ads->nodeptrs[i] = NULL; + for (i = 0; i < ports_count; i++) + ads->ports[i].port_nr = NO_CSI2_PORT; + swnodes->handle = handle; + swnodes->ads = ads; + list_add(&swnodes->list, &crs_csi2_swnodes); + + return; + +out_free: + kfree(swnodes); + kfree(ads); + acpi_handle_debug(handle, "cannot allocate for %zu software nodes\n", + ports_count); +} + +/** + * acpi_bus_scan_crs_csi2 - Construct software nodes out of ACPI _CRS CSI2 + * resource descriptors + * @ctx: ACPI _CRS CSI2 context, gathered during tree walk earlier + * + * This function does a number of things: + * + * 1. Count how many references to other devices _CRS CSI-2 instances have in + * total. + * + * 2. Count the number of references to other devices for each _CRS CSI-2 + * instance. + * + * 3. Allocate memory for swnodes each ACPI device requires later on, and + * generate a list of such allocations. + * + * Note that struct acpi_device may not be available yet at this time. + * + * acpi_scan_lock in scan.c must be held when calling this function. + */ +void acpi_bus_scan_crs_csi2(struct acpi_scan_context_csi2 *ctx) +{ + struct acpi_handle_ref *handle_refs; + struct acpi_handle_ref *this = NULL; + size_t this_count; + unsigned int curr = 0; + struct crs_csi2 *csi2; + + /* No handles? Bail out here. */ + if (!ctx->handle_count) + return; + + handle_refs = kcalloc(ctx->handle_count + 1, sizeof(*handle_refs), + GFP_KERNEL); + if (!handle_refs) { + pr_debug("no memory for %zu handle refs\n", + ctx->handle_count + 1); + return; + } + + /* Associate handles to the number of references. */ + list_for_each_entry(csi2, &ctx->crs_csi2_head, 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 the handles by remote so duplicates canbe easily found. */ + sort(handle_refs, ctx->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 < ctx->handle_count + 1; curr++) { + /* Weed out duplicate receiver devices. */ + if (this->handle == handle_refs[curr].handle) { + this_count += handle_refs[curr].count; + continue; + } + + acpi_crs_csi2_alloc_fill_swnodes(this_count, this->handle); + + this = &handle_refs[curr]; + this_count = this->count; + } + + kfree(handle_refs); +} diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 280d12e0aa2f..ddf7701a57d0 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -2042,16 +2042,6 @@ struct acpi_postponed_handle { acpi_handle handle; }; -/** - * struct acpi_scan_context - Context for scanning ACPI devices - * @postponed_head: The list head of the postponed ACPI handles - * @device: The first encountered device, typically the root of the scanned tree - */ -struct acpi_scan_context { - struct list_head postponed_head; - struct acpi_device *device; -}; - /** * acpi_bus_handle_postpone - Add an ACPI handle to a given postponed list * @handle: The ACPI handle @@ -2073,7 +2063,7 @@ static void acpi_bus_handle_postpone(acpi_handle handle, list_add(&ph->list, head); } -static acpi_status acpi_bus_check_add(acpi_handle handle, bool check_dep, +static acpi_status acpi_bus_check_add(acpi_handle handle, bool first_pass, struct acpi_scan_context *ctx) { struct acpi_device *device = acpi_fetch_acpi_dev(handle); @@ -2091,8 +2081,11 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, bool check_dep, if (acpi_device_should_be_hidden(handle)) return AE_OK; + if (first_pass) + acpi_bus_scan_check_crs_csi2(handle, ctx); + /* Bail out if there are dependencies. */ - if (acpi_scan_check_dep(handle, check_dep) > 0) { + if (acpi_scan_check_dep(handle, first_pass) > 0) { acpi_bus_handle_postpone(handle, &ctx->postponed_head); return AE_CTRL_DEPTH; } @@ -2118,10 +2111,10 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, bool check_dep, } /* - * If check_dep is true at this point, the device has no dependencies, + * If first_pass is true at this point, the device has no dependencies, * or the creation of the device object would have been postponed above. */ - acpi_add_single_object(&device, handle, type, !check_dep); + acpi_add_single_object(&device, handle, type, !first_pass); if (!device) return AE_CTRL_DEPTH; @@ -2146,6 +2139,14 @@ static acpi_status acpi_bus_check_add_2(acpi_handle handle, u32 lvl_not_used, return acpi_bus_check_add(handle, false, (struct acpi_scan_context *)ctx); } +static acpi_status acpi_bus_check_csi2(acpi_handle handle, u32 lvl_not_used, + void *ctx, void **unused) +{ + acpi_bus_scan_check_crs_csi2(handle, ctx); + + return AE_OK; +} + static void acpi_default_enumeration(struct acpi_device *device) { /* @@ -2466,6 +2467,7 @@ int acpi_bus_scan(acpi_handle handle) { struct acpi_scan_context ctx = { .postponed_head = LIST_HEAD_INIT(ctx.postponed_head), + .csi2.crs_csi2_head = LIST_HEAD_INIT(ctx.csi2.crs_csi2_head), }; struct acpi_postponed_handle *ph, *tmp_ph; int ret = 0; @@ -2480,6 +2482,24 @@ int acpi_bus_scan(acpi_handle handle) goto out_release; } + /* + * Check _CRS CSI2 resource descriptors for devices that were not + * traversed during the previous pass. + */ + list_for_each_entry_safe(ph, tmp_ph, &ctx.postponed_head, list) { + acpi_bus_check_csi2(ph->handle, 0, &ctx, NULL); + acpi_walk_namespace(ACPI_TYPE_DEVICE, ph->handle, ACPI_UINT32_MAX, + acpi_bus_check_csi2, NULL, (void *)&ctx, + NULL); + } + + /* + * Construct software nodes out of _CRS CSI2 records and release the + * _CRS CSI2 records. + */ + acpi_bus_scan_crs_csi2(&ctx.csi2); + acpi_bus_scan_crs_csi2_release(&ctx.csi2.crs_csi2_head); + acpi_bus_attach(ctx.device, (void *)true); /* @@ -2511,6 +2531,8 @@ int acpi_bus_scan(acpi_handle handle) kfree(ph); } + 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 57acb895c038..e4e8faac9212 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;