Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755001AbcKCHXh (ORCPT ); Thu, 3 Nov 2016 03:23:37 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:55042 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754266AbcKCHXN (ORCPT ); Thu, 3 Nov 2016 03:23:13 -0400 From: Hemant Kumar To: linux-kernel@vger.kernel.org Cc: maddy@linux.vnet.ibm.com, mpe@ellerman.id.au, benh@kernel.crashing.org, paulus@samba.org, anton@samba.org, sukadev@linux.vnet.ibm.com, mikey@neuling.org, stewart@linux.vnet.ibm.com, eranian@google.com, Hemant Kumar Subject: [PATCH 2/6] powerpc/powernv: Autoload IMA device driver module Date: Thu, 3 Nov 2016 12:52:31 +0530 X-Mailer: git-send-email 2.7.4 In-Reply-To: <1478157755-14636-1-git-send-email-hemant@linux.vnet.ibm.com> References: <1478157755-14636-1-git-send-email-hemant@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16110307-0052-0000-0000-000001E2BE79 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 16110307-0053-0000-0000-0000071EB3D8 Message-Id: <1478157755-14636-3-git-send-email-hemant@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2016-11-03_02:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=1 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1609300000 definitions=main-1611030137 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6680 Lines: 206 This patch does three things : - Enables "opal.c" to create a platform device for the IMA interface according to the appropriate compatibility string. - Find the reserved-memory region details from the system device tree and get the base address of HOMER region address for each chip. - We also get the Nest PMU counter data offsets (in the HOMER region) and their sizes. The offsets for the counters' data are fixed and won't change from chip to chip. The device tree parsing logic is separated from the PMU creation functions (which is done in subsequent patches). Right now, only Nest units are taken care of. Cc: Madhavan Srinivasan Cc: Michael Ellerman Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Anton Blanchard Cc: Sukadev Bhattiprolu Cc: Michael Neuling Cc: Stewart Smith Cc: Stephane Eranian Signed-off-by: Hemant Kumar --- arch/powerpc/platforms/powernv/Makefile | 2 +- arch/powerpc/platforms/powernv/opal-ima.c | 117 ++++++++++++++++++++++++++++++ arch/powerpc/platforms/powernv/opal.c | 13 ++++ 3 files changed, 131 insertions(+), 1 deletion(-) create mode 100644 arch/powerpc/platforms/powernv/opal-ima.c diff --git a/arch/powerpc/platforms/powernv/Makefile b/arch/powerpc/platforms/powernv/Makefile index b5d98cb..ee28528 100644 --- a/arch/powerpc/platforms/powernv/Makefile +++ b/arch/powerpc/platforms/powernv/Makefile @@ -2,7 +2,7 @@ obj-y += setup.o opal-wrappers.o opal.o opal-async.o idle.o obj-y += opal-rtc.o opal-nvram.o opal-lpc.o opal-flash.o obj-y += rng.o opal-elog.o opal-dump.o opal-sysparam.o opal-sensor.o obj-y += opal-msglog.o opal-hmi.o opal-power.o opal-irqchip.o -obj-y += opal-kmsg.o +obj-y += opal-kmsg.o opal-ima.o obj-$(CONFIG_SMP) += smp.o subcore.o subcore-asm.o obj-$(CONFIG_PCI) += pci.o pci-ioda.o npu-dma.o diff --git a/arch/powerpc/platforms/powernv/opal-ima.c b/arch/powerpc/platforms/powernv/opal-ima.c new file mode 100644 index 0000000..446e7bc --- /dev/null +++ b/arch/powerpc/platforms/powernv/opal-ima.c @@ -0,0 +1,117 @@ +/* + * OPAL IMA interface detection driver + * Supported on POWERNV platform + * + * Copyright (C) 2016 Madhavan Srinivasan, IBM Corporation. + * (C) 2016 Hemant K Shaw, IBM Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * 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. See the + * GNU General Public License for more details. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct perchip_nest_info nest_perchip_info[IMA_MAX_CHIPS]; + +static int opal_ima_counters_probe(struct platform_device *pdev) +{ + struct device_node *child, *ima_dev, *rm_node = NULL; + struct perchip_nest_info *pcni; + u32 reg[4], pages, nest_offset, nest_size, idx; + int i = 0; + const char *node_name; + + if (!pdev || !pdev->dev.of_node) + return -ENODEV; + + ima_dev = pdev->dev.of_node; + + /* + * nest_offset : where the nest-counters' data start. + * size : size of the entire nest-counters region + */ + if (of_property_read_u32(ima_dev, "ima-nest-offset", &nest_offset)) + goto err; + if (of_property_read_u32(ima_dev, "ima-nest-size", &nest_size)) + goto err; + + /* Find the "homer region" for each chip */ + rm_node = of_find_node_by_path("/reserved-memory"); + if (!rm_node) + goto err; + + for_each_child_of_node(rm_node, child) { + if (of_property_read_string_index(child, "name", 0, + &node_name)) + continue; + if (strncmp("ibm,homer-image", node_name, + strlen("ibm,homer-image"))) + continue; + + /* Get the chip id to which the above homer region belongs to */ + if (of_property_read_u32(child, "ibm,chip-id", &idx)) + goto err; + + /* reg property will have four u32 cells. */ + if (of_property_read_u32_array(child, "reg", reg, 4)) + goto err; + + pcni = &nest_perchip_info[idx]; + + /* Fetch the homer region base address */ + pcni->pbase = reg[0]; + pcni->pbase = pcni->pbase << 32 | reg[1]; + /* Add the nest IMA Base offset */ + pcni->pbase = pcni->pbase + nest_offset; + /* Fetch the size of the homer region */ + pcni->size = nest_size; + + do { + pages = PAGE_SIZE * i; + pcni->vbase[i++] = (u64)phys_to_virt(pcni->pbase + + pages); + } while (i < (pcni->size / PAGE_SIZE)); + } + + return 0; +err: + return -ENODEV; +} + +static const struct of_device_id opal_ima_match[] = { + { .compatible = IMA_DTB_COMPAT }, + {}, +}; + +static struct platform_driver opal_ima_driver = { + .driver = { + .name = "opal-ima-counters", + .of_match_table = opal_ima_match, + }, + .probe = opal_ima_counters_probe, +}; + +MODULE_DEVICE_TABLE(of, opal_ima_match); +module_platform_driver(opal_ima_driver); +MODULE_DESCRIPTION("PowerNV OPAL IMA driver"); +MODULE_LICENSE("GPL"); diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c index 6c9a65b..118cab0 100644 --- a/arch/powerpc/platforms/powernv/opal.c +++ b/arch/powerpc/platforms/powernv/opal.c @@ -30,6 +30,7 @@ #include #include #include +#include #include "powernv.h" @@ -650,6 +651,15 @@ static void opal_i2c_create_devs(void) of_platform_device_create(np, NULL, NULL); } +static void opal_ima_init_dev(void) +{ + struct device_node *np; + + np = of_find_compatible_node(NULL, NULL, IMA_DTB_COMPAT); + if (np) + of_platform_device_create(np, NULL, NULL); +} + static int kopald(void *unused) { unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1; @@ -723,6 +733,9 @@ static int __init opal_init(void) /* Setup a heatbeat thread if requested by OPAL */ opal_init_heartbeat(); + /* Detect IMA pmu counters support and create PMUs */ + opal_ima_init_dev(); + /* Create leds platform devices */ leds = of_find_node_by_path("/ibm,opal/leds"); if (leds) { -- 2.7.4