Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752466AbbEDUvy (ORCPT ); Mon, 4 May 2015 16:51:54 -0400 Received: from mga14.intel.com ([192.55.52.115]:45313 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751823AbbEDUvf (ORCPT ); Mon, 4 May 2015 16:51:35 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.13,368,1427785200"; d="scan'208";a="689814069" From: Srinivas Pandruvada To: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org Cc: linux-kernel@vger.kernel.org, pebolle@tiscali.nl, Srinivas Pandruvada Subject: [PATCH v3] x86: punit_atom: punit device state debug driver Date: Mon, 4 May 2015 13:49:53 -0700 Message-Id: <1430772593-20204-2-git-send-email-srinivas.pandruvada@linux.intel.com> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1430772593-20204-1-git-send-email-srinivas.pandruvada@linux.intel.com> References: <1430772593-20204-1-git-send-email-srinivas.pandruvada@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 8210 Lines: 262 The patch adds a debug driver, which dumps the power states of all the North complex (NC) devices. This debug interface is useful to figure out the devices, which blocks the S0ix transitions on the platform. This is extremely useful during enabling PM on customer platforms and derivatives. This submission is based on the submission from Kumar P, Mahesh . https://lkml.org/lkml/2014/11/5/367 The changes done on top of the above submission: - Dropped changes to config for PMC_ATOM, as PMC_ATOM is not just a debug driver as suggested by the change. It has additional power off interface also. - Instead of just using nc ("North complex") use punit_.. similar to south complex PMC. - Removed pmc_config structure, as we don't need to predefine number of register, we want to dump. This way new register can be added without changing NC_NUM_DEVICES. - prefixed function with punit_ - The debugfs directory will be punit_atom, which is NC equivalent of pmc_atom, which we already exposed by pmc_atom driver. - Added explanation for register and shift defines - Will not create debugfs if the cpuid doesn't match - Formatting changes to match compliance to coding convention - Address review comments Signed-off-by: Srinivas Pandruvada --- arch/x86/Kconfig.debug | 9 ++ arch/x86/platform/intel-mid/Makefile | 2 + arch/x86/platform/intel-mid/punit_atom_debug.c | 186 +++++++++++++++++++++++++ 3 files changed, 197 insertions(+) create mode 100644 arch/x86/platform/intel-mid/punit_atom_debug.c diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug index 20028da..4f42c3a 100644 --- a/arch/x86/Kconfig.debug +++ b/arch/x86/Kconfig.debug @@ -336,4 +336,13 @@ config X86_DEBUG_STATIC_CPU_HAS If unsure, say N. +config PUNIT_ATOM_DEBUG + tristate "ATOM Punit debug driver" + depends on DEBUG_FS + select IOSF_MBI + ---help--- + This is a debug driver, which gets the power states + of all Punit North Complex devices. The power states of + each device is exposed as part of the debugfs interface. + endmenu diff --git a/arch/x86/platform/intel-mid/Makefile b/arch/x86/platform/intel-mid/Makefile index 0a8ee70..4763952 100644 --- a/arch/x86/platform/intel-mid/Makefile +++ b/arch/x86/platform/intel-mid/Makefile @@ -5,3 +5,5 @@ obj-$(CONFIG_EARLY_PRINTK_INTEL_MID) += early_printk_intel_mid.o ifdef CONFIG_X86_INTEL_MID obj-$(CONFIG_SFI) += sfi.o device_libs/ endif + +obj-$(CONFIG_PUNIT_ATOM_DEBUG) += punit_atom_debug.o diff --git a/arch/x86/platform/intel-mid/punit_atom_debug.c b/arch/x86/platform/intel-mid/punit_atom_debug.c new file mode 100644 index 0000000..3b41e0a --- /dev/null +++ b/arch/x86/platform/intel-mid/punit_atom_debug.c @@ -0,0 +1,186 @@ +/* + * Intel SOC Punit device state debug driver + * Punit controls power management for North Complex devices (Graphics + * blocks, Image Signal Processing, video processing, display, DSP etc.) + * + * Copyright (c) 2015, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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 + +/* Side band Interface port */ +#define PUNIT_PORT 0x04 +/* Power gate status reg */ +#define PWRGT_STATUS 0x61 +/* Subsystem config/status Video processor */ +#define VED_SS_PM0 0x32 +/* Subsystem config/status ISP (Image Signal Processor) */ +#define ISP_SS_PM0 0x39 +/* Subsystem config/status Input/output controller */ +#define MIO_SS_PM 0x3B +/* Shift bits for getting status for video, isp and i/o */ +#define SSS_SHIFT 24 +/* Shift bits for getting status for graphics rendering */ +#define RENDER_POS 0 +/* Shift bits for getting status for media control */ +#define MEDIA_POS 2 +/* Shift bits for getting status for Valley View/Baytrail display */ +#define VLV_DISPLAY_POS 6 +/* Subsystem config/status DSP for Cherry Trail SOC */ +#define CHT_DSP_SSS 0x36 +/* Shift bits for getting status for DSP */ +#define CHT_DSP_SSS_POS 16 + +struct punit_device { + char *name; + int reg; + int sss_pos; +}; + +static struct punit_device *punit_device; + +static const struct punit_device punit_device_byt[] = { + { "GFX RENDER", PWRGT_STATUS, RENDER_POS }, + { "GFX MEDIA", PWRGT_STATUS, MEDIA_POS }, + { "DISPLAY", PWRGT_STATUS, VLV_DISPLAY_POS }, + { "VED", VED_SS_PM0, SSS_SHIFT }, + { "ISP", ISP_SS_PM0, SSS_SHIFT }, + { "MIO", MIO_SS_PM, SSS_SHIFT }, + { NULL } +}; + +static const struct punit_device punit_device_cht[] = { + { "GFX RENDER", PWRGT_STATUS, RENDER_POS }, + { "GFX MEDIA", PWRGT_STATUS, MEDIA_POS }, + { "DSP", CHT_DSP_SSS, CHT_DSP_SSS_POS }, + { "VED", VED_SS_PM0, SSS_SHIFT }, + { "ISP", ISP_SS_PM0, SSS_SHIFT }, + { "MIO", MIO_SS_PM, SSS_SHIFT }, + { NULL } +}; + +static const char * const dstates[] = {"D0", "D0i1", "D0i2", "D0i3"}; + +static int punit_dev_state_show(struct seq_file *seq_file, void *unused) +{ + u32 punit_pwr_status; + struct punit_device *punit_devp = punit_device; + int index; + int status; + + seq_puts(seq_file, "\n\nPUNIT NORTH COMPLEX DEVICES :\n"); + while (punit_devp->name) { + status = iosf_mbi_read(PUNIT_PORT, BT_MBI_PMC_READ, + punit_devp->reg, + &punit_pwr_status); + if (status) + seq_printf(seq_file, "%9s : Read Failed\n", + punit_devp->name); + else { + index = (punit_pwr_status >> punit_devp->sss_pos) & 3; + seq_printf(seq_file, "%9s : %s\n", punit_devp->name, + dstates[index]); + } + punit_devp++; + } + + return 0; +} + +static int punit_dev_state_open(struct inode *inode, struct file *file) +{ + return single_open(file, punit_dev_state_show, inode->i_private); +} + +static const struct file_operations punit_dev_state_ops = { + .open = punit_dev_state_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static struct dentry *punit_dbg_file; + +static int punit_dbgfs_register(void) +{ + static struct dentry *dev_state; + + punit_dbg_file = debugfs_create_dir("punit_atom", NULL); + if (!punit_dbg_file) + return -ENXIO; + + dev_state = debugfs_create_file("dev_power_state", S_IFREG | S_IRUGO, + punit_dbg_file, NULL, + &punit_dev_state_ops); + if (!dev_state) { + pr_err("punit_dev_state register failed\n"); + return -ENXIO; + } + + return 0; +} + +static void punit_dbgfs_unregister(void) +{ + debugfs_remove_recursive(punit_dbg_file); +} + +#define ICPU(model, drv_data) \ + { X86_VENDOR_INTEL, 6, model, X86_FEATURE_MWAIT,\ + (kernel_ulong_t)&drv_data } + +static const struct x86_cpu_id intel_punit_cpu_ids[] = { + ICPU(0x4c, punit_device_cht), + ICPU(0x37, punit_device_byt), + {} +}; + +MODULE_DEVICE_TABLE(x86cpu, intel_punit_cpu_ids); + +static int __init punit_atom_debug_init(void) +{ + const struct x86_cpu_id *id; + int ret; + + id = x86_match_cpu(intel_punit_cpu_ids); + if (!id) + return -ENODEV; + + punit_device = (struct punit_device *)id->driver_data; + + ret = punit_dbgfs_register(); + if (ret < 0) + return ret; + + return 0; +} + +static void __exit punit_atom_debug_exit(void) +{ + punit_dbgfs_unregister(); +} + +module_init(punit_atom_debug_init); +module_exit(punit_atom_debug_exit); + +MODULE_AUTHOR("Kumar P, Mahesh "); +MODULE_AUTHOR("Srinivas Pandruvada "); +MODULE_DESCRIPTION("Driver for Punit devices states debugging"); +MODULE_LICENSE("GPL v2"); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/