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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Arnd Bergmann](/assets/img/avatar_default.png)
All file_operations should get a .llseek operation so we can make nonseekable_open the default for future file operations without a .llseek pointer. The three cases that we can automatically detect are no_llseek, seq_lseek and default_llseek. For cases where we can we can automatically prove that the file offset is always ignored, we use noop_llseek, which maintains the current behavior of not returning an error from a seek. New drivers should normally not use noop_llseek but instead use no_llseek and call nonseekable_open at open time. Existing drivers can be converted to do the same when the maintainer knows for certain that no user code relies on calling seek on the device file. The generated code is often incorrectly indented and right now contains comments that clarify for each added line why a specific variant was chosen. In the version that gets submitted upstream, the comments will be gone and I will manually fix the indentation, because there does not seem to be a way to do that using coccinelle. Some amount of new code is currently sitting in linux-next that should get the same modifications, which I will do at the end of the merge window. Many thanks to Julia Lawall for helping me learn to write a semantic patch that does all this. ===== begin semantic patch ===== // This adds an llseek= method to all file operations, // as a preparation for making no_llseek the default. // // The rules are // - use no_llseek explicitly if we do nonseekable_open // - use seq_lseek for sequential files // - use default_llseek if we know we access f_pos // - use noop_llseek if we know we don't access f_pos, // but we still want to allow users to call lseek // @ open1 exists @ identifier nested_open; @@ nested_open(...) { <+... nonseekable_open(...) ...+> } @ open exists@ identifier open_f; identifier i, f; identifier open1.nested_open; @@ int open_f(struct inode *i, struct file *f) { <+... ( nonseekable_open(...) | nested_open(...) ) ...+> } @ read disable optional_qualifier exists @ identifier read_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; expression E; identifier func; @@ ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off) { <+... ( *off = E | *off += E | func(..., off, ...) | E = *off ) ...+> } @ read_no_fpos disable optional_qualifier exists @ identifier read_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; @@ ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off) { ... when != off } @ write @ identifier write_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; expression E; identifier func; @@ ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off) { <+... ( *off = E | *off += E | func(..., off, ...) | E = *off ) ...+> } @ write_no_fpos @ identifier write_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; @@ ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off) { ... when != off } @ fops0 @ identifier fops; @@ struct file_operations fops = { ... }; @ has_llseek depends on fops0 @ identifier fops0.fops; identifier llseek_f; @@ struct file_operations fops = { ... .llseek = llseek_f, ... }; @ has_read depends on fops0 @ identifier fops0.fops; identifier read_f; @@ struct file_operations fops = { ... .read = read_f, ... }; @ has_write depends on fops0 @ identifier fops0.fops; identifier write_f; @@ struct file_operations fops = { ... .write = write_f, ... }; @ has_open depends on fops0 @ identifier fops0.fops; identifier open_f; @@ struct file_operations fops = { ... .open = open_f, ... }; // use no_llseek if we call nonseekable_open //////////////////////////////////////////// @ nonseekable1 depends on !has_llseek && has_open @ identifier fops0.fops; identifier nso ~= "nonseekable_open"; @@ struct file_operations fops = { ... .open = nso, ... +.llseek = no_llseek, /* nonseekable */ }; @ nonseekable2 depends on !has_llseek @ identifier fops0.fops; identifier open.open_f; @@ struct file_operations fops = { ... .open = open_f, ... +.llseek = no_llseek, /* open uses nonseekable */ }; // use seq_lseek for sequential files ///////////////////////////////////// @ seq depends on !has_llseek @ identifier fops0.fops; identifier sr ~= "seq_read"; @@ struct file_operations fops = { ... .read = sr, ... +.llseek = seq_lseek, /* we have seq_read */ }; // use default_llseek if there is a readdir /////////////////////////////////////////// @ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier readdir_e; @@ // any other fop is used that changes pos struct file_operations fops = { ... .readdir = readdir_e, ... +.llseek = default_llseek, /* readdir is present */ }; // use default_llseek if at least one of read/write touches f_pos ///////////////////////////////////////////////////////////////// @ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read.read_f; @@ // read fops use offset struct file_operations fops = { ... .read = read_f, ... +.llseek = default_llseek, /* read accesses f_pos */ }; @ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier write.write_f; @@ // write fops use offset struct file_operations fops = { ... .write = write_f, ... + .llseek = default_llseek, /* write accesses f_pos */ }; // Use noop_llseek if neither read nor write accesses f_pos /////////////////////////////////////////////////////////// @ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read_no_fpos.read_f; identifier write_no_fpos.write_f; @@ // write fops use offset struct file_operations fops = { ... .write = write_f, .read = read_f, ... +.llseek = noop_llseek, /* read and write both use no f_pos */ }; @ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier write_no_fpos.write_f; @@ struct file_operations fops = { ... .write = write_f, ... +.llseek = noop_llseek, /* write uses no f_pos */ }; @ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read_no_fpos.read_f; @@ struct file_operations fops = { ... .read = read_f, ... +.llseek = noop_llseek, /* read uses no f_pos */ }; @ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; @@ struct file_operations fops = { ... +.llseek = noop_llseek, /* no read or write fn */ }; ===== End semantic patch ===== Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Julia Lawall <julia@diku.dk> Cc: Christoph Hellwig <hch@infradead.org>
618 lines
16 KiB
C
618 lines
16 KiB
C
/*
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* (C) Copyright 2008 Intel Corporation
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* Authors:
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* Andy Henroid <andrew.d.henroid@intel.com>
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* Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
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*/
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/*
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* Save DIMM power on Intel 7300-based platforms when all CPUs/cores
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* are idle, using the DIMM thermal throttling capability.
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*
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* This driver depends on the Intel integrated DMA controller (I/O AT).
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* If the driver for I/O AT (drivers/dma/ioatdma*) is also enabled,
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* this driver should work cooperatively.
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*/
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/* #define DEBUG */
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/gfp.h>
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#include <linux/sched.h>
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#include <linux/notifier.h>
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#include <linux/cpumask.h>
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#include <linux/ktime.h>
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#include <linux/delay.h>
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#include <linux/debugfs.h>
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#include <linux/stop_machine.h>
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#include <linux/i7300_idle.h>
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#include <asm/idle.h>
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#include "../dma/ioat/hw.h"
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#include "../dma/ioat/registers.h"
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#define I7300_IDLE_DRIVER_VERSION "1.55"
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#define I7300_PRINT "i7300_idle:"
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#define MAX_STOP_RETRIES 10
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static int debug;
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module_param_named(debug, debug, uint, 0644);
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MODULE_PARM_DESC(debug, "Enable debug printks in this driver");
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static int forceload;
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module_param_named(forceload, forceload, uint, 0644);
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MODULE_PARM_DESC(debug, "Enable driver testing on unvalidated i5000");
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#define dprintk(fmt, arg...) \
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do { if (debug) printk(KERN_INFO I7300_PRINT fmt, ##arg); } while (0)
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/*
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* Value to set THRTLOW to when initiating throttling
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* 0 = No throttling
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* 1 = Throttle when > 4 activations per eval window (Maximum throttling)
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* 2 = Throttle when > 8 activations
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* 168 = Throttle when > 672 activations (Minimum throttling)
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*/
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#define MAX_THROTTLE_LOW_LIMIT 168
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static uint throttle_low_limit = 1;
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module_param_named(throttle_low_limit, throttle_low_limit, uint, 0644);
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MODULE_PARM_DESC(throttle_low_limit,
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"Value for THRTLOWLM activation field "
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"(0 = disable throttle, 1 = Max throttle, 168 = Min throttle)");
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/*
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* simple invocation and duration statistics
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*/
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static unsigned long total_starts;
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static unsigned long total_us;
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#ifdef DEBUG
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static unsigned long past_skip;
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#endif
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static struct pci_dev *fbd_dev;
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static spinlock_t i7300_idle_lock;
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static int i7300_idle_active;
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static u8 i7300_idle_thrtctl_saved;
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static u8 i7300_idle_thrtlow_saved;
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static u32 i7300_idle_mc_saved;
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static cpumask_var_t idle_cpumask;
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static ktime_t start_ktime;
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static unsigned long avg_idle_us;
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static struct dentry *debugfs_dir;
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/* Begin: I/O AT Helper routines */
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#define IOAT_CHANBASE(ioat_ctl, chan) (ioat_ctl + 0x80 + 0x80 * chan)
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/* Snoop control (disable snoops when coherency is not important) */
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#define IOAT_DESC_SADDR_SNP_CTL (1UL << 1)
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#define IOAT_DESC_DADDR_SNP_CTL (1UL << 2)
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static struct pci_dev *ioat_dev;
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static struct ioat_dma_descriptor *ioat_desc; /* I/O AT desc & data (1 page) */
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static unsigned long ioat_desc_phys;
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static u8 *ioat_iomap; /* I/O AT memory-mapped control regs (aka CB_BAR) */
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static u8 *ioat_chanbase;
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/* Start I/O AT memory copy */
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static int i7300_idle_ioat_start(void)
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{
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u32 err;
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/* Clear error (due to circular descriptor pointer) */
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err = readl(ioat_chanbase + IOAT_CHANERR_OFFSET);
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if (err)
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writel(err, ioat_chanbase + IOAT_CHANERR_OFFSET);
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writeb(IOAT_CHANCMD_START, ioat_chanbase + IOAT1_CHANCMD_OFFSET);
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return 0;
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}
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/* Stop I/O AT memory copy */
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static void i7300_idle_ioat_stop(void)
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{
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int i;
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u64 sts;
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for (i = 0; i < MAX_STOP_RETRIES; i++) {
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writeb(IOAT_CHANCMD_RESET,
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ioat_chanbase + IOAT1_CHANCMD_OFFSET);
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udelay(10);
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sts = readq(ioat_chanbase + IOAT1_CHANSTS_OFFSET) &
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IOAT_CHANSTS_STATUS;
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if (sts != IOAT_CHANSTS_ACTIVE)
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break;
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}
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if (i == MAX_STOP_RETRIES) {
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dprintk("failed to stop I/O AT after %d retries\n",
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MAX_STOP_RETRIES);
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}
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}
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/* Test I/O AT by copying 1024 byte from 2k to 1k */
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static int __init i7300_idle_ioat_selftest(u8 *ctl,
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struct ioat_dma_descriptor *desc, unsigned long desc_phys)
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{
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u64 chan_sts;
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memset(desc, 0, 2048);
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memset((u8 *) desc + 2048, 0xab, 1024);
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desc[0].size = 1024;
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desc[0].ctl = 0;
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desc[0].src_addr = desc_phys + 2048;
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desc[0].dst_addr = desc_phys + 1024;
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desc[0].next = 0;
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writeb(IOAT_CHANCMD_RESET, ioat_chanbase + IOAT1_CHANCMD_OFFSET);
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writeb(IOAT_CHANCMD_START, ioat_chanbase + IOAT1_CHANCMD_OFFSET);
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udelay(1000);
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chan_sts = readq(ioat_chanbase + IOAT1_CHANSTS_OFFSET) &
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IOAT_CHANSTS_STATUS;
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if (chan_sts != IOAT_CHANSTS_DONE) {
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/* Not complete, reset the channel */
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writeb(IOAT_CHANCMD_RESET,
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ioat_chanbase + IOAT1_CHANCMD_OFFSET);
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return -1;
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}
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if (*(u32 *) ((u8 *) desc + 3068) != 0xabababab ||
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*(u32 *) ((u8 *) desc + 2044) != 0xabababab) {
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dprintk("Data values src 0x%x, dest 0x%x, memset 0x%x\n",
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*(u32 *) ((u8 *) desc + 2048),
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*(u32 *) ((u8 *) desc + 1024),
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*(u32 *) ((u8 *) desc + 3072));
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return -1;
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}
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return 0;
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}
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static struct device dummy_dma_dev = {
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.init_name = "fallback device",
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.coherent_dma_mask = DMA_BIT_MASK(64),
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.dma_mask = &dummy_dma_dev.coherent_dma_mask,
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};
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/* Setup and initialize I/O AT */
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/* This driver needs I/O AT as the throttling takes effect only when there is
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* some memory activity. We use I/O AT to set up a dummy copy, while all CPUs
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* go idle and memory is throttled.
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*/
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static int __init i7300_idle_ioat_init(void)
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{
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u8 ver, chan_count, ioat_chan;
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u16 chan_ctl;
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ioat_iomap = (u8 *) ioremap_nocache(pci_resource_start(ioat_dev, 0),
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pci_resource_len(ioat_dev, 0));
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if (!ioat_iomap) {
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printk(KERN_ERR I7300_PRINT "failed to map I/O AT registers\n");
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goto err_ret;
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}
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ver = readb(ioat_iomap + IOAT_VER_OFFSET);
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if (ver != IOAT_VER_1_2) {
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printk(KERN_ERR I7300_PRINT "unknown I/O AT version (%u.%u)\n",
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ver >> 4, ver & 0xf);
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goto err_unmap;
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}
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chan_count = readb(ioat_iomap + IOAT_CHANCNT_OFFSET);
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if (!chan_count) {
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printk(KERN_ERR I7300_PRINT "unexpected # of I/O AT channels "
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"(%u)\n",
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chan_count);
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goto err_unmap;
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}
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ioat_chan = chan_count - 1;
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ioat_chanbase = IOAT_CHANBASE(ioat_iomap, ioat_chan);
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chan_ctl = readw(ioat_chanbase + IOAT_CHANCTRL_OFFSET);
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if (chan_ctl & IOAT_CHANCTRL_CHANNEL_IN_USE) {
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printk(KERN_ERR I7300_PRINT "channel %d in use\n", ioat_chan);
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goto err_unmap;
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}
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writew(IOAT_CHANCTRL_CHANNEL_IN_USE,
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ioat_chanbase + IOAT_CHANCTRL_OFFSET);
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ioat_desc = (struct ioat_dma_descriptor *)dma_alloc_coherent(
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&dummy_dma_dev, 4096,
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(dma_addr_t *)&ioat_desc_phys, GFP_KERNEL);
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if (!ioat_desc) {
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printk(KERN_ERR I7300_PRINT "failed to allocate I/O AT desc\n");
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goto err_mark_unused;
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}
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writel(ioat_desc_phys & 0xffffffffUL,
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ioat_chanbase + IOAT1_CHAINADDR_OFFSET_LOW);
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writel(ioat_desc_phys >> 32,
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ioat_chanbase + IOAT1_CHAINADDR_OFFSET_HIGH);
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if (i7300_idle_ioat_selftest(ioat_iomap, ioat_desc, ioat_desc_phys)) {
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printk(KERN_ERR I7300_PRINT "I/O AT self-test failed\n");
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goto err_free;
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}
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/* Setup circular I/O AT descriptor chain */
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ioat_desc[0].ctl = IOAT_DESC_SADDR_SNP_CTL | IOAT_DESC_DADDR_SNP_CTL;
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ioat_desc[0].src_addr = ioat_desc_phys + 2048;
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ioat_desc[0].dst_addr = ioat_desc_phys + 3072;
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ioat_desc[0].size = 128;
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ioat_desc[0].next = ioat_desc_phys + sizeof(struct ioat_dma_descriptor);
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ioat_desc[1].ctl = ioat_desc[0].ctl;
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ioat_desc[1].src_addr = ioat_desc[0].src_addr;
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ioat_desc[1].dst_addr = ioat_desc[0].dst_addr;
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ioat_desc[1].size = ioat_desc[0].size;
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ioat_desc[1].next = ioat_desc_phys;
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return 0;
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err_free:
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dma_free_coherent(&dummy_dma_dev, 4096, (void *)ioat_desc, 0);
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err_mark_unused:
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writew(0, ioat_chanbase + IOAT_CHANCTRL_OFFSET);
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err_unmap:
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iounmap(ioat_iomap);
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err_ret:
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return -ENODEV;
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}
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/* Cleanup I/O AT */
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static void __exit i7300_idle_ioat_exit(void)
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{
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int i;
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u64 chan_sts;
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i7300_idle_ioat_stop();
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/* Wait for a while for the channel to halt before releasing */
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for (i = 0; i < MAX_STOP_RETRIES; i++) {
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writeb(IOAT_CHANCMD_RESET,
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ioat_chanbase + IOAT1_CHANCMD_OFFSET);
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chan_sts = readq(ioat_chanbase + IOAT1_CHANSTS_OFFSET) &
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IOAT_CHANSTS_STATUS;
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if (chan_sts != IOAT_CHANSTS_ACTIVE) {
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writew(0, ioat_chanbase + IOAT_CHANCTRL_OFFSET);
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break;
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}
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udelay(1000);
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}
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chan_sts = readq(ioat_chanbase + IOAT1_CHANSTS_OFFSET) &
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IOAT_CHANSTS_STATUS;
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/*
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* We tried to reset multiple times. If IO A/T channel is still active
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* flag an error and return without cleanup. Memory leak is better
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* than random corruption in that extreme error situation.
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*/
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if (chan_sts == IOAT_CHANSTS_ACTIVE) {
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printk(KERN_ERR I7300_PRINT "Unable to stop IO A/T channels."
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" Not freeing resources\n");
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return;
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}
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dma_free_coherent(&dummy_dma_dev, 4096, (void *)ioat_desc, 0);
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iounmap(ioat_iomap);
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}
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/* End: I/O AT Helper routines */
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#define DIMM_THRTLOW 0x64
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#define DIMM_THRTCTL 0x67
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#define DIMM_THRTCTL_THRMHUNT (1UL << 0)
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#define DIMM_MC 0x40
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#define DIMM_GTW_MODE (1UL << 17)
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#define DIMM_GBLACT 0x60
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/*
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* Keep track of an exponential-decaying average of recent idle durations.
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* The latest duration gets DURATION_WEIGHT_PCT percentage weight
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* in this average, with the old average getting the remaining weight.
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*
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* High weights emphasize recent history, low weights include long history.
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*/
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#define DURATION_WEIGHT_PCT 55
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/*
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* When the decaying average of recent durations or the predicted duration
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* of the next timer interrupt is shorter than duration_threshold, the
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* driver will decline to throttle.
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*/
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#define DURATION_THRESHOLD_US 100
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/* Store DIMM thermal throttle configuration */
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static int i7300_idle_thrt_save(void)
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{
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u32 new_mc_val;
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u8 gblactlm;
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pci_read_config_byte(fbd_dev, DIMM_THRTCTL, &i7300_idle_thrtctl_saved);
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pci_read_config_byte(fbd_dev, DIMM_THRTLOW, &i7300_idle_thrtlow_saved);
|
|
pci_read_config_dword(fbd_dev, DIMM_MC, &i7300_idle_mc_saved);
|
|
/*
|
|
* Make sure we have Global Throttling Window Mode set to have a
|
|
* "short" window. This (mostly) works around an issue where
|
|
* throttling persists until the end of the global throttling window
|
|
* size. On the tested system, this was resulting in a maximum of
|
|
* 64 ms to exit throttling (average 32 ms). The actual numbers
|
|
* depends on system frequencies. Setting the short window reduces
|
|
* this by a factor of 4096.
|
|
*
|
|
* We will only do this only if the system is set for
|
|
* unlimited-activations while in open-loop throttling (i.e., when
|
|
* Global Activation Throttle Limit is zero).
|
|
*/
|
|
pci_read_config_byte(fbd_dev, DIMM_GBLACT, &gblactlm);
|
|
dprintk("thrtctl_saved = 0x%02x, thrtlow_saved = 0x%02x\n",
|
|
i7300_idle_thrtctl_saved,
|
|
i7300_idle_thrtlow_saved);
|
|
dprintk("mc_saved = 0x%08x, gblactlm = 0x%02x\n",
|
|
i7300_idle_mc_saved,
|
|
gblactlm);
|
|
if (gblactlm == 0) {
|
|
new_mc_val = i7300_idle_mc_saved | DIMM_GTW_MODE;
|
|
pci_write_config_dword(fbd_dev, DIMM_MC, new_mc_val);
|
|
return 0;
|
|
} else {
|
|
dprintk("could not set GTW_MODE = 1 (OLTT enabled)\n");
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
|
|
/* Restore DIMM thermal throttle configuration */
|
|
static void i7300_idle_thrt_restore(void)
|
|
{
|
|
pci_write_config_dword(fbd_dev, DIMM_MC, i7300_idle_mc_saved);
|
|
pci_write_config_byte(fbd_dev, DIMM_THRTLOW, i7300_idle_thrtlow_saved);
|
|
pci_write_config_byte(fbd_dev, DIMM_THRTCTL, i7300_idle_thrtctl_saved);
|
|
}
|
|
|
|
/* Enable DIMM thermal throttling */
|
|
static void i7300_idle_start(void)
|
|
{
|
|
u8 new_ctl;
|
|
u8 limit;
|
|
|
|
new_ctl = i7300_idle_thrtctl_saved & ~DIMM_THRTCTL_THRMHUNT;
|
|
pci_write_config_byte(fbd_dev, DIMM_THRTCTL, new_ctl);
|
|
|
|
limit = throttle_low_limit;
|
|
if (unlikely(limit > MAX_THROTTLE_LOW_LIMIT))
|
|
limit = MAX_THROTTLE_LOW_LIMIT;
|
|
|
|
pci_write_config_byte(fbd_dev, DIMM_THRTLOW, limit);
|
|
|
|
new_ctl = i7300_idle_thrtctl_saved | DIMM_THRTCTL_THRMHUNT;
|
|
pci_write_config_byte(fbd_dev, DIMM_THRTCTL, new_ctl);
|
|
}
|
|
|
|
/* Disable DIMM thermal throttling */
|
|
static void i7300_idle_stop(void)
|
|
{
|
|
u8 new_ctl;
|
|
u8 got_ctl;
|
|
|
|
new_ctl = i7300_idle_thrtctl_saved & ~DIMM_THRTCTL_THRMHUNT;
|
|
pci_write_config_byte(fbd_dev, DIMM_THRTCTL, new_ctl);
|
|
|
|
pci_write_config_byte(fbd_dev, DIMM_THRTLOW, i7300_idle_thrtlow_saved);
|
|
pci_write_config_byte(fbd_dev, DIMM_THRTCTL, i7300_idle_thrtctl_saved);
|
|
pci_read_config_byte(fbd_dev, DIMM_THRTCTL, &got_ctl);
|
|
WARN_ON_ONCE(got_ctl != i7300_idle_thrtctl_saved);
|
|
}
|
|
|
|
|
|
/*
|
|
* i7300_avg_duration_check()
|
|
* return 0 if the decaying average of recent idle durations is
|
|
* more than DURATION_THRESHOLD_US
|
|
*/
|
|
static int i7300_avg_duration_check(void)
|
|
{
|
|
if (avg_idle_us >= DURATION_THRESHOLD_US)
|
|
return 0;
|
|
|
|
#ifdef DEBUG
|
|
past_skip++;
|
|
#endif
|
|
return 1;
|
|
}
|
|
|
|
/* Idle notifier to look at idle CPUs */
|
|
static int i7300_idle_notifier(struct notifier_block *nb, unsigned long val,
|
|
void *data)
|
|
{
|
|
unsigned long flags;
|
|
ktime_t now_ktime;
|
|
static ktime_t idle_begin_time;
|
|
static int time_init = 1;
|
|
|
|
if (!throttle_low_limit)
|
|
return 0;
|
|
|
|
if (unlikely(time_init)) {
|
|
time_init = 0;
|
|
idle_begin_time = ktime_get();
|
|
}
|
|
|
|
spin_lock_irqsave(&i7300_idle_lock, flags);
|
|
if (val == IDLE_START) {
|
|
|
|
cpumask_set_cpu(smp_processor_id(), idle_cpumask);
|
|
|
|
if (cpumask_weight(idle_cpumask) != num_online_cpus())
|
|
goto end;
|
|
|
|
now_ktime = ktime_get();
|
|
idle_begin_time = now_ktime;
|
|
|
|
if (i7300_avg_duration_check())
|
|
goto end;
|
|
|
|
i7300_idle_active = 1;
|
|
total_starts++;
|
|
start_ktime = now_ktime;
|
|
|
|
i7300_idle_start();
|
|
i7300_idle_ioat_start();
|
|
|
|
} else if (val == IDLE_END) {
|
|
cpumask_clear_cpu(smp_processor_id(), idle_cpumask);
|
|
if (cpumask_weight(idle_cpumask) == (num_online_cpus() - 1)) {
|
|
/* First CPU coming out of idle */
|
|
u64 idle_duration_us;
|
|
|
|
now_ktime = ktime_get();
|
|
|
|
idle_duration_us = ktime_to_us(ktime_sub
|
|
(now_ktime, idle_begin_time));
|
|
|
|
avg_idle_us =
|
|
((100 - DURATION_WEIGHT_PCT) * avg_idle_us +
|
|
DURATION_WEIGHT_PCT * idle_duration_us) / 100;
|
|
|
|
if (i7300_idle_active) {
|
|
ktime_t idle_ktime;
|
|
|
|
idle_ktime = ktime_sub(now_ktime, start_ktime);
|
|
total_us += ktime_to_us(idle_ktime);
|
|
|
|
i7300_idle_ioat_stop();
|
|
i7300_idle_stop();
|
|
i7300_idle_active = 0;
|
|
}
|
|
}
|
|
}
|
|
end:
|
|
spin_unlock_irqrestore(&i7300_idle_lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
static struct notifier_block i7300_idle_nb = {
|
|
.notifier_call = i7300_idle_notifier,
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(pci, pci_tbl);
|
|
|
|
int stats_open_generic(struct inode *inode, struct file *fp)
|
|
{
|
|
fp->private_data = inode->i_private;
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t stats_read_ul(struct file *fp, char __user *ubuf, size_t count,
|
|
loff_t *off)
|
|
{
|
|
unsigned long *p = fp->private_data;
|
|
char buf[32];
|
|
int len;
|
|
|
|
len = snprintf(buf, 32, "%lu\n", *p);
|
|
return simple_read_from_buffer(ubuf, count, off, buf, len);
|
|
}
|
|
|
|
static const struct file_operations idle_fops = {
|
|
.open = stats_open_generic,
|
|
.read = stats_read_ul,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
struct debugfs_file_info {
|
|
void *ptr;
|
|
char name[32];
|
|
struct dentry *file;
|
|
} debugfs_file_list[] = {
|
|
{&total_starts, "total_starts", NULL},
|
|
{&total_us, "total_us", NULL},
|
|
#ifdef DEBUG
|
|
{&past_skip, "past_skip", NULL},
|
|
#endif
|
|
{NULL, "", NULL}
|
|
};
|
|
|
|
static int __init i7300_idle_init(void)
|
|
{
|
|
spin_lock_init(&i7300_idle_lock);
|
|
total_us = 0;
|
|
|
|
if (i7300_idle_platform_probe(&fbd_dev, &ioat_dev, forceload))
|
|
return -ENODEV;
|
|
|
|
if (i7300_idle_thrt_save())
|
|
return -ENODEV;
|
|
|
|
if (i7300_idle_ioat_init())
|
|
return -ENODEV;
|
|
|
|
if (!zalloc_cpumask_var(&idle_cpumask, GFP_KERNEL))
|
|
return -ENOMEM;
|
|
|
|
debugfs_dir = debugfs_create_dir("i7300_idle", NULL);
|
|
if (debugfs_dir) {
|
|
int i = 0;
|
|
|
|
while (debugfs_file_list[i].ptr != NULL) {
|
|
debugfs_file_list[i].file = debugfs_create_file(
|
|
debugfs_file_list[i].name,
|
|
S_IRUSR,
|
|
debugfs_dir,
|
|
debugfs_file_list[i].ptr,
|
|
&idle_fops);
|
|
i++;
|
|
}
|
|
}
|
|
|
|
idle_notifier_register(&i7300_idle_nb);
|
|
|
|
printk(KERN_INFO "i7300_idle: loaded v%s\n", I7300_IDLE_DRIVER_VERSION);
|
|
return 0;
|
|
}
|
|
|
|
static void __exit i7300_idle_exit(void)
|
|
{
|
|
idle_notifier_unregister(&i7300_idle_nb);
|
|
free_cpumask_var(idle_cpumask);
|
|
|
|
if (debugfs_dir) {
|
|
int i = 0;
|
|
|
|
while (debugfs_file_list[i].file != NULL) {
|
|
debugfs_remove(debugfs_file_list[i].file);
|
|
i++;
|
|
}
|
|
|
|
debugfs_remove(debugfs_dir);
|
|
}
|
|
i7300_idle_thrt_restore();
|
|
i7300_idle_ioat_exit();
|
|
}
|
|
|
|
module_init(i7300_idle_init);
|
|
module_exit(i7300_idle_exit);
|
|
|
|
MODULE_AUTHOR("Andy Henroid <andrew.d.henroid@intel.com>");
|
|
MODULE_DESCRIPTION("Intel Chipset DIMM Idle Power Saving Driver v"
|
|
I7300_IDLE_DRIVER_VERSION);
|
|
MODULE_LICENSE("GPL");
|