Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751805AbdGaHgk (ORCPT ); Mon, 31 Jul 2017 03:36:40 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:36087 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751677AbdGaHgf (ORCPT ); Mon, 31 Jul 2017 03:36:35 -0400 From: Shilpasri G Bhat To: stewart@linux.vnet.ibm.com, cyrilbur@gmail.com Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au, ego@linux.vnet.ibm.com, svaidy@linux.vnet.ibm.com, Shilpasri G Bhat Subject: [PATCH V9 2/3] powernv: Add support to set power-shifting-ratio Date: Mon, 31 Jul 2017 13:06:04 +0530 X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1501486565-16079-1-git-send-email-shilpa.bhat@linux.vnet.ibm.com> References: <1501486565-16079-1-git-send-email-shilpa.bhat@linux.vnet.ibm.com> X-TM-AS-MML: disable x-cbid: 17073107-0040-0000-0000-0000034BF912 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17073107-0041-0000-0000-00000CC87AD1 Message-Id: <1501486565-16079-3-git-send-email-shilpa.bhat@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-07-31_03:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1706020000 definitions=main-1707310131 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 9245 Lines: 298 This patch adds support to set power-shifting-ratio which hints the firmware how to distribute/throttle power between different entities in a system (e.g CPU v/s GPU). This ratio is used by OCC for power capping algorithm. Signed-off-by: Shilpasri G Bhat --- Documentation/ABI/testing/sysfs-firmware-opal-psr | 18 +++ arch/powerpc/include/asm/opal-api.h | 4 +- arch/powerpc/include/asm/opal.h | 3 + arch/powerpc/platforms/powernv/Makefile | 2 +- arch/powerpc/platforms/powernv/opal-psr.c | 175 ++++++++++++++++++++++ arch/powerpc/platforms/powernv/opal-wrappers.S | 2 + arch/powerpc/platforms/powernv/opal.c | 3 + 7 files changed, 205 insertions(+), 2 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-firmware-opal-psr create mode 100644 arch/powerpc/platforms/powernv/opal-psr.c diff --git a/Documentation/ABI/testing/sysfs-firmware-opal-psr b/Documentation/ABI/testing/sysfs-firmware-opal-psr new file mode 100644 index 0000000..cc2ece7 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-firmware-opal-psr @@ -0,0 +1,18 @@ +What: /sys/firmware/opal/psr +Date: August 2017 +Contact: Linux for PowerPC mailing list +Description: Power-Shift-Ratio directory for Powernv P9 servers + + Power-Shift-Ratio allows to provide hints the firmware + to shift/throttle power between different entities in + the system. Each attribute in this directory indicates + a settable PSR. + +What: /sys/firmware/opal/psr/cpu_to_gpu_X +Date: August 2017 +Contact: Linux for PowerPC mailing list +Description: PSR sysfs attributes for Powernv P9 servers + + Power-Shift-Ratio between CPU and GPU for a given chip + with chip-id X. This file gives the ratio (0-100) + which is used by OCC for power-capping. diff --git a/arch/powerpc/include/asm/opal-api.h b/arch/powerpc/include/asm/opal-api.h index c3e0c4a..92e31fd 100644 --- a/arch/powerpc/include/asm/opal-api.h +++ b/arch/powerpc/include/asm/opal-api.h @@ -193,7 +193,9 @@ #define OPAL_NPU_MAP_LPAR 148 #define OPAL_GET_POWERCAP 152 #define OPAL_SET_POWERCAP 153 -#define OPAL_LAST 153 +#define OPAL_GET_POWER_SHIFT_RATIO 154 +#define OPAL_SET_POWER_SHIFT_RATIO 155 +#define OPAL_LAST 155 /* Device tree flags */ diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h index ec2087c..b9ea77f 100644 --- a/arch/powerpc/include/asm/opal.h +++ b/arch/powerpc/include/asm/opal.h @@ -269,6 +269,8 @@ int64_t opal_xive_set_vp_info(uint64_t vp, int64_t opal_xive_dump(uint32_t type, uint32_t id); int opal_get_powercap(u32 handle, int token, u32 *pcap); int opal_set_powercap(u32 handle, int token, u32 pcap); +int opal_get_power_shift_ratio(u32 handle, int token, u32 *psr); +int opal_set_power_shift_ratio(u32 handle, int token, u32 psr); /* Internal functions */ extern int early_init_dt_scan_opal(unsigned long node, const char *uname, @@ -348,6 +350,7 @@ static inline int opal_get_async_rc(struct opal_msg msg) void opal_wake_poller(void); void opal_powercap_init(void); +void opal_psr_init(void); #endif /* __ASSEMBLY__ */ diff --git a/arch/powerpc/platforms/powernv/Makefile b/arch/powerpc/platforms/powernv/Makefile index e79f806..9ed7d33 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 opal-powercap.o +obj-y += opal-kmsg.o opal-powercap.o opal-psr.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-psr.c b/arch/powerpc/platforms/powernv/opal-psr.c new file mode 100644 index 0000000..7313b7f --- /dev/null +++ b/arch/powerpc/platforms/powernv/opal-psr.c @@ -0,0 +1,175 @@ +/* + * PowerNV OPAL Power-Shift-Ratio interface + * + * Copyright 2017 IBM Corp. + * + * 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. + */ + +#define pr_fmt(fmt) "opal-psr: " fmt + +#include +#include +#include + +#include + +DEFINE_MUTEX(psr_mutex); + +static struct kobject *psr_kobj; + +struct psr_attr { + u32 handle; + struct kobj_attribute attr; +} *psr_attrs; + +static ssize_t psr_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) +{ + struct psr_attr *psr_attr = container_of(attr, struct psr_attr, attr); + struct opal_msg msg; + int psr, ret, token; + + token = opal_async_get_token_interruptible(); + if (token < 0) { + pr_devel("Failed to get token\n"); + return token; + } + + ret = mutex_lock_interruptible(&psr_mutex); + if (ret) + goto out_token; + + ret = opal_get_power_shift_ratio(psr_attr->handle, token, + (u32 *)__pa(&psr)); + switch (ret) { + case OPAL_ASYNC_COMPLETION: + ret = opal_async_wait_response(token, &msg); + if (ret) { + pr_devel("Failed to wait for the async response\n"); + ret = -EIO; + goto out; + } + ret = opal_error_code(opal_get_async_rc(msg)); + if (!ret) { + ret = sprintf(buf, "%u\n", be32_to_cpu(psr)); + if (ret < 0) + ret = -EIO; + } + break; + case OPAL_SUCCESS: + ret = sprintf(buf, "%u\n", be32_to_cpu(psr)); + if (ret < 0) + ret = -EIO; + break; + default: + ret = opal_error_code(ret); + } + +out: + mutex_unlock(&psr_mutex); +out_token: + opal_async_release_token(token); + return ret; +} + +static ssize_t psr_store(struct kobject *kobj, struct kobj_attribute *attr, + const char *buf, size_t count) +{ + struct psr_attr *psr_attr = container_of(attr, struct psr_attr, attr); + struct opal_msg msg; + int psr, ret, token; + + ret = kstrtoint(buf, 0, &psr); + if (ret) + return ret; + + token = opal_async_get_token_interruptible(); + if (token < 0) { + pr_devel("Failed to get token\n"); + return token; + } + + ret = mutex_lock_interruptible(&psr_mutex); + if (ret) + goto out_token; + + ret = opal_set_power_shift_ratio(psr_attr->handle, token, psr); + switch (ret) { + case OPAL_ASYNC_COMPLETION: + ret = opal_async_wait_response(token, &msg); + if (ret) { + pr_devel("Failed to wait for the async response\n"); + ret = -EIO; + goto out; + } + ret = opal_error_code(opal_get_async_rc(msg)); + if (!ret) + ret = count; + break; + case OPAL_SUCCESS: + ret = count; + break; + default: + ret = opal_error_code(ret); + } + +out: + mutex_unlock(&psr_mutex); +out_token: + opal_async_release_token(token); + return ret; +} + +void __init opal_psr_init(void) +{ + struct device_node *psr, *node; + int i = 0; + + psr = of_find_compatible_node(NULL, NULL, + "ibm,opal-power-shift-ratio"); + if (!psr) { + pr_devel("Power-shift-ratio node not found\n"); + return; + } + + psr_attrs = kcalloc(of_get_child_count(psr), sizeof(struct psr_attr), + GFP_KERNEL); + if (!psr_attrs) + return; + + psr_kobj = kobject_create_and_add("psr", opal_kobj); + if (!psr_kobj) { + pr_warn("Failed to create psr kobject\n"); + goto out; + } + + for_each_child_of_node(psr, node) { + if (of_property_read_u32(node, "handle", + &psr_attrs[i].handle)) + goto out_kobj; + + sysfs_attr_init(&psr_attrs[i].attr.attr); + if (of_property_read_string(node, "label", + &psr_attrs[i].attr.attr.name)) + goto out_kobj; + psr_attrs[i].attr.attr.mode = 0664; + psr_attrs[i].attr.show = psr_show; + psr_attrs[i].attr.store = psr_store; + if (sysfs_create_file(psr_kobj, &psr_attrs[i].attr.attr)) { + pr_devel("Failed to create psr sysfs file %s\n", + psr_attrs[i].attr.attr.name); + goto out_kobj; + } + i++; + } + + return; +out_kobj: + kobject_put(psr_kobj); +out: + kfree(psr_attrs); +} diff --git a/arch/powerpc/platforms/powernv/opal-wrappers.S b/arch/powerpc/platforms/powernv/opal-wrappers.S index eff5fe7..f565979 100644 --- a/arch/powerpc/platforms/powernv/opal-wrappers.S +++ b/arch/powerpc/platforms/powernv/opal-wrappers.S @@ -312,3 +312,5 @@ OPAL_CALL(opal_npu_destroy_context, OPAL_NPU_DESTROY_CONTEXT); OPAL_CALL(opal_npu_map_lpar, OPAL_NPU_MAP_LPAR); OPAL_CALL(opal_get_powercap, OPAL_GET_POWERCAP); OPAL_CALL(opal_set_powercap, OPAL_SET_POWERCAP); +OPAL_CALL(opal_get_power_shift_ratio, OPAL_GET_POWER_SHIFT_RATIO); +OPAL_CALL(opal_set_power_shift_ratio, OPAL_SET_POWER_SHIFT_RATIO); diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c index 889da97..280a736 100644 --- a/arch/powerpc/platforms/powernv/opal.c +++ b/arch/powerpc/platforms/powernv/opal.c @@ -839,6 +839,9 @@ static int __init opal_init(void) /* Initialise OPAL powercap interface */ opal_powercap_init(); + /* Initialise OPAL Power-Shifting-Ratio interface */ + opal_psr_init(); + return 0; } machine_subsys_initcall(powernv, opal_init); -- 1.8.3.1