Messages in this thread Patch in this message | | | Date | Mon, 12 May 2003 22:15:49 +0200 | From | Pavel Machek <> | Subject | Re: [PATCH] restore sysenter MSRs at resume |
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Hi!
> > Some laptops also lose all the AGP settings in the chipset. > > Well, that's definitely a driver issue, and should be handled that way. I > suspect even the MTRR's should be handled as a driver, since unlike things > like the SYSENTER things, it really _is_ a driver already and is > conditional on kernel configuration etc.
Here's a patch, it simply adds mtrrs into as "sys" device...
Please apply, Pavel
Index: linux/arch/i386/kernel/cpu/mtrr/main.c =================================================================== --- linux.orig/arch/i386/kernel/cpu/mtrr/main.c 2003-01-05 22:58:19.000000000 +0100 +++ linux/arch/i386/kernel/cpu/mtrr/main.c 2003-05-12 22:06:05.000000000 +0200 @@ -2,6 +2,7 @@ Copyright (C) 1997-2000 Richard Gooch Copyright (c) 2002 Patrick Mochel + Copyright (c) 2003 Nigel Cunningham & Pavel Machek This library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public @@ -35,6 +36,7 @@ #include <linux/init.h> #include <linux/pci.h> #include <linux/smp.h> +#include <linux/suspend.h> #include <asm/mtrr.h> @@ -644,6 +646,104 @@ "write-protect", /* 5 */ "write-back", /* 6 */ }; + +#ifdef CONFIG_PM +struct mtrr_suspend_state +{ + mtrr_type ltype; + unsigned long lbase; + unsigned int lsize; +}; + +/* We return a pointer ptr on an area of *ptr bytes + beginning at ptr+sizeof(int) + This buffer has to be saved in some way during suspension */ +static int *mtrr_save_state(void) +{ + int i, len; + int *ptr = NULL; + static struct mtrr_suspend_state *mtrr_suspend_buffer=NULL; + + if(!mtrr_suspend_buffer) + { + len = num_var_ranges * sizeof (struct mtrr_suspend_state) + sizeof(int); + ptr = kmalloc (len, GFP_KERNEL); + if (ptr == NULL) + return(NULL); + *ptr = len; + ptr++; + mtrr_suspend_buffer = (struct mtrr_suspend_state *)ptr; + ptr--; + } + for (i = 0; i < num_var_ranges; ++i,mtrr_suspend_buffer++) + mtrr_if->get (i, + &(mtrr_suspend_buffer->lbase), + &(mtrr_suspend_buffer->lsize), + &(mtrr_suspend_buffer->ltype)); + return(ptr); +} + +/* We restore mtrrs from buffer ptr */ +static void mtrr_restore_state(int *ptr) +{ + int i, len; + struct mtrr_suspend_state *mtrr_suspend_buffer; + + len = num_var_ranges * sizeof (struct mtrr_suspend_state) + sizeof(int); + if(*ptr != len) + { + printk ("mtrr: Resuming failed due to different number of MTRRs\n"); + return; + } + ptr++; + mtrr_suspend_buffer=(struct mtrr_suspend_state *)ptr; + for (i = 0; i < num_var_ranges; ++i,mtrr_suspend_buffer++) + if (mtrr_suspend_buffer->lsize) + set_mtrr(i, + mtrr_suspend_buffer->lbase, + mtrr_suspend_buffer->lsize, + mtrr_suspend_buffer->ltype); +} + +static void *mtrr_state; + +static int mtrr_suspend(struct device *dev, u32 state, u32 level) +{ + if (level == SUSPEND_SAVE_STATE) + mtrr_state = mtrr_save_state(); + return 0; +} + +static int mtrr_resume(struct device *dev, u32 level) +{ + if (level == RESUME_POWER_ON) + mtrr_restore_state(mtrr_state); + return 0; +} + +static struct device_driver mtrr_driver = { + .name = "mtrr", + .bus = &system_bus_type, + .suspend = mtrr_suspend, + .resume = mtrr_resume, +}; + +static struct sys_device device_mtrr = { + .name = "mtrr", + .id = 0, + .dev = { + .name = "mtrr", + .driver = &mtrr_driver, + }, +}; +static int __init init_mtrr_devicefs(void) +{ + driver_register(&mtrr_driver); + return sys_device_register(&device_mtrr); +} + +device_initcall(init_mtrr_devicefs); +#endif core_initcall(mtrr_init); Pavel -- When do you have a heart between your knees? [Johanka's followup: and *two* hearts?] - 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/
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