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Date: Fri, 24 Oct 2008 13:03:48 -0400 (EDT)
From: Len Brown <lenb@...nel.org>
To: Venki Pallipadi <venkatesh.pallipadi@...el.com>
Cc: randy.dunlap@...cle.com, Andi Kleen <ak@...ux.intel.com>,
Ingo Molnar <mingo@...e.hu>,
"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
"Henroid, Andrew D" <andrew.d.henroid@...el.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] Cleanup of i7300_idle based on review comments
applied to acpi-test
thanks,
-len
On Wed, 22 Oct 2008, Venki Pallipadi wrote:
>
>
> Cleanup of i7300 idle driver based on review comments from Randy Dunlap,
> Andi Kleen and Len Brown.
>
> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
>
> ---
> drivers/idle/Kconfig | 11 ++++++-----
> drivers/idle/i7300_idle.c | 33 ++++++++++++++++++---------------
> 2 files changed, 24 insertions(+), 20 deletions(-)
>
> Index: linux-acpi-2.6/drivers/idle/Kconfig
> ===================================================================
> --- linux-acpi-2.6.orig/drivers/idle/Kconfig 2008-10-22 11:43:08.000000000 -0700
> +++ linux-acpi-2.6/drivers/idle/Kconfig 2008-10-22 11:43:37.000000000 -0700
> @@ -5,12 +5,13 @@ config I7300_IDLE_IOAT_CHANNEL
> bool
>
> config I7300_IDLE
> - tristate "Intel chipset idle power saving driver"
> + tristate "Intel chipset idle memory power saving driver"
> select I7300_IDLE_IOAT_CHANNEL
> - depends on X86_64
> + depends on X86_64 && EXPERIMENTAL
> help
> - Enable idle power savings with certain Intel server chipsets.
> - The chipset must have I/O AT support, such as the Intel 7300.
> - The power savings depends on the type and quantity of DRAM devices.
> + Enable memory power savings when idle with certain Intel server
> + chipsets. The chipset must have I/O AT support, such as the
> + Intel 7300. The power savings depends on the type and quantity of
> + DRAM devices.
>
> endmenu
> Index: linux-acpi-2.6/drivers/idle/i7300_idle.c
> ===================================================================
> --- linux-acpi-2.6.orig/drivers/idle/i7300_idle.c 2008-10-22 11:43:08.000000000 -0700
> +++ linux-acpi-2.6/drivers/idle/i7300_idle.c 2008-10-22 11:43:37.000000000 -0700
> @@ -35,6 +35,8 @@
> #define I7300_IDLE_DRIVER_VERSION "1.55"
> #define I7300_PRINT "i7300_idle:"
>
> +#define MAX_STOP_RETRIES 10
> +
> static int debug;
> module_param_named(debug, debug, uint, 0644);
> MODULE_PARM_DESC(debug, "Enable debug printks in this driver");
> @@ -47,12 +49,12 @@ MODULE_PARM_DESC(debug, "Enable debug pr
> * 0 = No throttling
> * 1 = Throttle when > 4 activations per eval window (Maximum throttling)
> * 2 = Throttle when > 8 activations
> - * 168 = Throttle when > 168 activations (Minimum throttling)
> + * 168 = Throttle when > 672 activations (Minimum throttling)
> */
> -#define MAX_THRTLWLIMIT 168
> -static uint i7300_idle_thrtlowlm = 1;
> -module_param_named(thrtlwlimit, i7300_idle_thrtlowlm, uint, 0644);
> -MODULE_PARM_DESC(thrtlwlimit,
> +#define MAX_THROTTLE_LOW_LIMIT 168
> +static uint throttle_low_limit = 1;
> +module_param_named(throttle_low_limit, throttle_low_limit, uint, 0644);
> +MODULE_PARM_DESC(throttle_low_limit,
> "Value for THRTLOWLM activation field "
> "(0 = disable throttle, 1 = Max throttle, 168 = Min throttle)");
>
> @@ -111,9 +113,9 @@ static int i7300_idle_ioat_start(void)
> static void i7300_idle_ioat_stop(void)
> {
> int i;
> - u8 sts;
> + u64 sts;
>
> - for (i = 0; i < 5; i++) {
> + for (i = 0; i < MAX_STOP_RETRIES; i++) {
> writeb(IOAT_CHANCMD_RESET,
> ioat_chanbase + IOAT1_CHANCMD_OFFSET);
>
> @@ -127,9 +129,10 @@ static void i7300_idle_ioat_stop(void)
>
> }
>
> - if (i == 5)
> - dprintk("failed to suspend+reset I/O AT after 5 retries\n");
> -
> + if (i == MAX_STOP_RETRIES) {
> + dprintk("failed to stop I/O AT after %d retries\n",
> + MAX_STOP_RETRIES);
> + }
> }
>
> /* Test I/O AT by copying 1024 byte from 2k to 1k */
> @@ -276,7 +279,7 @@ static void __exit i7300_idle_ioat_exit(
> i7300_idle_ioat_stop();
>
> /* Wait for a while for the channel to halt before releasing */
> - for (i = 0; i < 10; i++) {
> + for (i = 0; i < MAX_STOP_RETRIES; i++) {
> writeb(IOAT_CHANCMD_RESET,
> ioat_chanbase + IOAT1_CHANCMD_OFFSET);
>
> @@ -390,9 +393,9 @@ static void i7300_idle_start(void)
> new_ctl = i7300_idle_thrtctl_saved & ~DIMM_THRTCTL_THRMHUNT;
> pci_write_config_byte(fbd_dev, DIMM_THRTCTL, new_ctl);
>
> - limit = i7300_idle_thrtlowlm;
> - if (unlikely(limit > MAX_THRTLWLIMIT))
> - limit = MAX_THRTLWLIMIT;
> + 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);
>
> @@ -441,7 +444,7 @@ static int i7300_idle_notifier(struct no
> static ktime_t idle_begin_time;
> static int time_init = 1;
>
> - if (!i7300_idle_thrtlowlm)
> + if (!throttle_low_limit)
> return 0;
>
> if (unlikely(time_init)) {
> --
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