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x86/platform/atom/punit: Add Punit device state debug driver

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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 Mahesh Kumar P:

  https://lkml.org/lkml/2014/11/5/367

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Mahesh Kumar P <mahesh.kumar.p@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: pebolle@tiscali.nl
Link: http://lkml.kernel.org/r/1430939754-6900-2-git-send-email-srinivas.pandruvada@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Srinivas Pandruvada 2015-05-06 12:15:54 -07:00 committed by Ingo Molnar
parent 1222e564cf
commit 956079e081
4 changed files with 196 additions and 0 deletions
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11
arch/x86/Kconfig.debug
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@ -332,4 +332,15 @@ config X86_DEBUG_STATIC_CPU_HAS
If unsure, say N.
config PUNIT_ATOM_DEBUG
tristate "ATOM Punit debug driver"
select 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.
The current power state can be read from
/sys/kernel/debug/punit_atom/dev_power_state
endmenu

1
arch/x86/platform/Makefile
View file

@ -1,4 +1,5 @@
# Platform specific code goes here
obj-y += atom/
obj-y += ce4100/
obj-y += efi/
obj-y += geode/

1
arch/x86/platform/atom/Makefile Normal file
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@ -0,0 +1 @@
obj-$(CONFIG_PUNIT_ATOM_DEBUG) += punit_atom_debug.o

183
arch/x86/platform/atom/punit_atom_debug.c Normal file
View file

@ -0,0 +1,183 @@
/*
* 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 <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/io.h>
#include <asm/cpu_device_id.h>
#include <asm/iosf_mbi.h>
/* 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 display for Cherry Trail SOC */
#define CHT_DSP_SSS 0x36
/* Shift bits for getting status for display */
#define CHT_DSP_SSS_POS 16
struct punit_device {
char *name;
int reg;
int sss_pos;
};
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 },
{ "DISPLAY", 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 = seq_file->private;
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(struct punit_device *punit_device)
{
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, punit_device,
&punit_dev_state_ops);
if (!dev_state) {
pr_err("punit_dev_state register failed\n");
debugfs_remove(punit_dbg_file);
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(55, punit_device_byt), /* Valleyview, Bay Trail */
ICPU(76, punit_device_cht), /* Braswell, Cherry Trail */
{}
};
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;
ret = punit_dbgfs_register((struct punit_device *)id->driver_data);
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 <mahesh.kumar.p@intel.com>");
MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
MODULE_DESCRIPTION("Driver for Punit devices states debugging");
MODULE_LICENSE("GPL v2");