/* * Common ACPI functions for hot plug platforms * * Copyright (C) 2006 Intel Corporation * * All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or (at * your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or * NON INFRINGEMENT. See the GNU General Public License for more * details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * Send feedback to <kristen.c.accardi@intel.com> * */ #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/kernel.h> #include <linux/types.h> #include <linux/pci.h> #include <linux/pci_hotplug.h> #include <acpi/acpi.h> #include <acpi/acpi_bus.h> #include <acpi/actypes.h> #define MY_NAME "acpi_pcihp" #define dbg(fmt, arg...) do { if (debug_acpi) printk(KERN_DEBUG "%s: %s: " fmt , MY_NAME , __FUNCTION__ , ## arg); } while (0) #define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg) #define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg) #define warn(format, arg...) printk(KERN_WARNING "%s: " format , MY_NAME , ## arg) #define METHOD_NAME__SUN "_SUN" #define METHOD_NAME__HPP "_HPP" #define METHOD_NAME_OSHP "OSHP" static int debug_acpi; static acpi_status decode_type0_hpx_record(union acpi_object *record, struct hotplug_params *hpx) { int i; union acpi_object *fields = record->package.elements; u32 revision = fields[1].integer.value; switch (revision) { case 1: if (record->package.count != 6) return AE_ERROR; for (i = 2; i < 6; i++) if (fields[i].type != ACPI_TYPE_INTEGER) return AE_ERROR; hpx->t0 = &hpx->type0_data; hpx->t0->revision = revision; hpx->t0->cache_line_size = fields[2].integer.value; hpx->t0->latency_timer = fields[3].integer.value; hpx->t0->enable_serr = fields[4].integer.value; hpx->t0->enable_perr = fields[5].integer.value; break; default: printk(KERN_WARNING "%s: Type 0 Revision %d record not supported\n", __FUNCTION__, revision); return AE_ERROR; } return AE_OK; } static acpi_status decode_type1_hpx_record(union acpi_object *record, struct hotplug_params *hpx) { int i; union acpi_object *fields = record->package.elements; u32 revision = fields[1].integer.value; switch (revision) { case 1: if (record->package.count != 5) return AE_ERROR; for (i = 2; i < 5; i++) if (fields[i].type != ACPI_TYPE_INTEGER) return AE_ERROR; hpx->t1 = &hpx->type1_data; hpx->t1->revision = revision; hpx->t1->max_mem_read = fields[2].integer.value; hpx->t1->avg_max_split = fields[3].integer.value; hpx->t1->tot_max_split = fields[4].integer.value; break; default: printk(KERN_WARNING "%s: Type 1 Revision %d record not supported\n", __FUNCTION__, revision); return AE_ERROR; } return AE_OK; } static acpi_status decode_type2_hpx_record(union acpi_object *record, struct hotplug_params *hpx) { int i; union acpi_object *fields = record->package.elements; u32 revision = fields[1].integer.value; switch (revision) { case 1: if (record->package.count != 18) return AE_ERROR; for (i = 2; i < 18; i++) if (fields[i].type != ACPI_TYPE_INTEGER) return AE_ERROR; hpx->t2 = &hpx->type2_data; hpx->t2->revision = revision; hpx->t2->unc_err_mask_and = fields[2].integer.value; hpx->t2->unc_err_mask_or = fields[3].integer.value; hpx->t2->unc_err_sever_and = fields[4].integer.value; hpx->t2->unc_err_sever_or = fields[5].integer.value; hpx->t2->cor_err_mask_and = fields[6].integer.value; hpx->t2->cor_err_mask_or = fields[7].integer.value; hpx->t2->adv_err_cap_and = fields[8].integer.value; hpx->t2->adv_err_cap_or = fields[9].integer.value; hpx->t2->pci_exp_devctl_and = fields[10].integer.value; hpx->t2->pci_exp_devctl_or = fields[11].integer.value; hpx->t2->pci_exp_lnkctl_and = fields[12].integer.value; hpx->t2->pci_exp_lnkctl_or = fields[13].integer.value; hpx->t2->sec_unc_err_sever_and = fields[14].integer.value; hpx->t2->sec_unc_err_sever_or = fields[15].integer.value; hpx->t2->sec_unc_err_mask_and = fields[16].integer.value; hpx->t2->sec_unc_err_mask_or = fields[17].integer.value; break; default: printk(KERN_WARNING "%s: Type 2 Revision %d record not supported\n", __FUNCTION__, revision); return AE_ERROR; } return AE_OK; } static acpi_status acpi_run_hpx(acpi_handle handle, struct hotplug_params *hpx) { acpi_status status; struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; union acpi_object *package, *record, *fields; u32 type; int i; /* Clear the return buffer with zeros */ memset(hpx, 0, sizeof(struct hotplug_params)); status = acpi_evaluate_object(handle, "_HPX", NULL, &buffer); if (ACPI_FAILURE(status)) return status; package = (union acpi_object *)buffer.pointer; if (package->type != ACPI_TYPE_PACKAGE) { status = AE_ERROR; goto exit; } for (i = 0; i < package->package.count; i++) { record = &package->package.elements[i]; if (record->type != ACPI_TYPE_PACKAGE) { status = AE_ERROR; goto exit; } fields = record->package.elements; if (fields[0].type != ACPI_TYPE_INTEGER || fields[1].type != ACPI_TYPE_INTEGER) { status = AE_ERROR; goto exit; } type = fields[0].integer.value; switch (type) { case 0: status = decode_type0_hpx_record(record, hpx); if (ACPI_FAILURE(status)) goto exit; break; case 1: status = decode_type1_hpx_record(record, hpx); if (ACPI_FAILURE(status)) goto exit; break; case 2: status = decode_type2_hpx_record(record, hpx); if (ACPI_FAILURE(status)) goto exit; break; default: printk(KERN_ERR "%s: Type %d record not supported\n", __FUNCTION__, type); status = AE_ERROR; goto exit; } } exit: kfree(buffer.pointer); return status; } static acpi_status acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp) { acpi_status status; u8 nui[4]; struct acpi_buffer ret_buf = { 0, NULL}; struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object *ext_obj, *package; int i, len = 0; acpi_get_name(handle, ACPI_FULL_PATHNAME, &string); /* Clear the return buffer with zeros */ memset(hpp, 0, sizeof(struct hotplug_params)); /* get _hpp */ status = acpi_evaluate_object(handle, METHOD_NAME__HPP, NULL, &ret_buf); switch (status) { case AE_BUFFER_OVERFLOW: ret_buf.pointer = kmalloc (ret_buf.length, GFP_KERNEL); if (!ret_buf.pointer) { printk(KERN_ERR "%s:%s alloc for _HPP fail\n", __FUNCTION__, (char *)string.pointer); kfree(string.pointer); return AE_NO_MEMORY; } status = acpi_evaluate_object(handle, METHOD_NAME__HPP, NULL, &ret_buf); if (ACPI_SUCCESS(status)) break; default: if (ACPI_FAILURE(status)) { pr_debug("%s:%s _HPP fail=0x%x\n", __FUNCTION__, (char *)string.pointer, status); kfree(string.pointer); return status; } } ext_obj = (union acpi_object *) ret_buf.pointer; if (ext_obj->type != ACPI_TYPE_PACKAGE) { printk(KERN_ERR "%s:%s _HPP obj not a package\n", __FUNCTION__, (char *)string.pointer); status = AE_ERROR; goto free_and_return; } len = ext_obj->package.count; package = (union acpi_object *) ret_buf.pointer; for ( i = 0; (i < len) || (i < 4); i++) { ext_obj = (union acpi_object *) &package->package.elements[i]; switch (ext_obj->type) { case ACPI_TYPE_INTEGER: nui[i] = (u8)ext_obj->integer.value; break; default: printk(KERN_ERR "%s:%s _HPP obj type incorrect\n", __FUNCTION__, (char *)string.pointer); status = AE_ERROR; goto free_and_return; } } hpp->t0 = &hpp->type0_data; hpp->t0->cache_line_size = nui[0]; hpp->t0->latency_timer = nui[1]; hpp->t0->enable_serr = nui[2]; hpp->t0->enable_perr = nui[3]; pr_debug(" _HPP: cache_line_size=0x%x\n", hpp->t0->cache_line_size); pr_debug(" _HPP: latency timer =0x%x\n", hpp->t0->latency_timer); pr_debug(" _HPP: enable SERR =0x%x\n", hpp->t0->enable_serr); pr_debug(" _HPP: enable PERR =0x%x\n", hpp->t0->enable_perr); free_and_return: kfree(string.pointer); kfree(ret_buf.pointer); return status; } /* acpi_run_oshp - get control of hotplug from the firmware * * @handle - the handle of the hotplug controller. */ acpi_status acpi_run_oshp(acpi_handle handle) { acpi_status status; struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL }; acpi_get_name(handle, ACPI_FULL_PATHNAME, &string); /* run OSHP */ status = acpi_evaluate_object(handle, METHOD_NAME_OSHP, NULL, NULL); if (ACPI_FAILURE(status)) if (status != AE_NOT_FOUND) printk(KERN_ERR "%s:%s OSHP fails=0x%x\n", __FUNCTION__, (char *)string.pointer, status); else dbg("%s:%s OSHP not found\n", __FUNCTION__, (char *)string.pointer); else pr_debug("%s:%s OSHP passes\n", __FUNCTION__, (char *)string.pointer); kfree(string.pointer); return status; } EXPORT_SYMBOL_GPL(acpi_run_oshp); /* acpi_get_hp_params_from_firmware * * @bus - the pci_bus of the bus on which the device is newly added * @hpp - allocated by the caller */ acpi_status acpi_get_hp_params_from_firmware(struct pci_bus *bus, struct hotplug_params *hpp) { acpi_status status = AE_NOT_FOUND; acpi_handle handle, phandle; struct pci_bus *pbus = bus; struct pci_dev *pdev; do { pdev = pbus->self; if (!pdev) { handle = acpi_get_pci_rootbridge_handle( pci_domain_nr(pbus), pbus->number); break; } handle = DEVICE_ACPI_HANDLE(&(pdev->dev)); pbus = pbus->parent; } while (!handle); /* * _HPP settings apply to all child buses, until another _HPP is * encountered. If we don't find an _HPP for the input pci dev, * look for it in the parent device scope since that would apply to * this pci dev. If we don't find any _HPP, use hardcoded defaults */ while (handle) { status = acpi_run_hpx(handle, hpp); if (ACPI_SUCCESS(status)) break; status = acpi_run_hpp(handle, hpp); if (ACPI_SUCCESS(status)) break; if (acpi_root_bridge(handle)) break; status = acpi_get_parent(handle, &phandle); if (ACPI_FAILURE(status)) break; handle = phandle; } return status; } EXPORT_SYMBOL_GPL(acpi_get_hp_params_from_firmware); /* acpi_root_bridge - check to see if this acpi object is a root bridge * * @handle - the acpi object in question. */ int acpi_root_bridge(acpi_handle handle) { acpi_status status; struct acpi_device_info *info; struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; int i; status = acpi_get_object_info(handle, &buffer); if (ACPI_SUCCESS(status)) { info = buffer.pointer; if ((info->valid & ACPI_VALID_HID) && !strcmp(PCI_ROOT_HID_STRING, info->hardware_id.value)) { kfree(buffer.pointer); return 1; } if (info->valid & ACPI_VALID_CID) { for (i=0; i < info->compatibility_id.count; i++) { if (!strcmp(PCI_ROOT_HID_STRING, info->compatibility_id.id[i].value)) { kfree(buffer.pointer); return 1; } } } kfree(buffer.pointer); } return 0; } EXPORT_SYMBOL_GPL(acpi_root_bridge); module_param(debug_acpi, bool, 0644); MODULE_PARM_DESC(debug_acpi, "Debugging mode for ACPI enabled or not");