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ANDROID: PCI/PM: Use usleep_range for d3hot_delay

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This patch implements a vendor hook that changes d3hot_delay to use
usleep_range() instead of msleep() to reduce the resume time from
20ms to 10ms.

The call sequence is as follows:
pci_pm_resume_noirq()
pci_pm_default_resume_early()
pci_power_up()
pci_raw_set_power_state() --> msleep(10)

The default d3hot_delay is 10ms. Using msleep for delays less than 20ms
could result in delays up to 20ms.
Reference: Documentation/timers/timers-howto.rst

Using usleep_range() results in the delay being closer to 10ms and this
reduces the resume time.

Bug: 194231641
Change-Id: If3e4dcfb99edad302371273933fa6784854cf892
Signed-off-by: Sajid Dalvi <sdalvi@google.com>
This commit is contained in:
Sajid Dalvi
2021-07-27 17:31:07 -05:00
committed by Greg Kroah-Hartman
parent 609fa1be7a
commit 53ff5efb2c
3 changed files with 29 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/android/vendor_hooks.c
View File

@@ -74,6 +74,7 @@
#include <trace/hooks/sound.h>
#include <trace/hooks/snd_compr.h>
#include <trace/hooks/gup.h>
#include <trace/hooks/pci.h>
/*
* Export tracepoints that act as a bare tracehook (ie: have no trace event
@@ -395,3 +396,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_update_load_avg);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_remove_entity_load_avg);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_update_blocked_fair);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_update_rt_rq_load_avg);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_pci_d3_sleep);

8
drivers/pci/pci.c
View File

@@ -31,6 +31,7 @@
#include <linux/vmalloc.h>
#include <asm/dma.h>
#include <linux/aer.h>
#include <trace/hooks/pci.h>
#include "pci.h"
DEFINE_MUTEX(pci_slot_mutex);
@@ -68,8 +69,11 @@ static void pci_dev_d3_sleep(struct pci_dev *dev)
if (delay < pci_pm_d3hot_delay)
delay = pci_pm_d3hot_delay;
if (delay)
msleep(delay);
if (delay) {
trace_android_rvh_pci_d3_sleep(dev, &delay);
if (delay)
msleep(delay);
}
}
#ifdef CONFIG_PCI_DOMAINS

21
include/trace/hooks/pci.h Normal file
View File

@@ -0,0 +1,21 @@
/* SPDX-License-Identifier: GPL-2.0 */
#undef TRACE_SYSTEM
#define TRACE_SYSTEM pci
#define TRACE_INCLUDE_PATH trace/hooks
#if !defined(_TRACE_HOOK_PCI_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_HOOK_PCI_H
#include <trace/hooks/vendor_hooks.h>
/*
* Following tracepoints are not exported in tracefs and provide a
* mechanism for vendor modules to hook and extend functionality
*/
DECLARE_RESTRICTED_HOOK(android_rvh_pci_d3_sleep,
TP_PROTO(struct pci_dev *dev, unsigned int *delay),
TP_ARGS(dev, delay), 1);
#endif /* _TRACE_HOOK_PCI_H */
/* This part must be outside protection */
#include <trace/define_trace.h>