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Message-Id: <200806040033.20736.rjw@sisk.pl>
Date: Wed, 4 Jun 2008 00:33:20 +0200
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Pavel Machek <pavel@...e.cz>
Cc: Patrick <ragamuffin@...acomm.ch>, linux-kernel@...r.kernel.org,
Ingo Molnar <mingo@...e.hu>,
pm list <linux-pm@...ts.linux-foundation.org>
Subject: Re: >3G => iommu => suspend problems -- was Re: SB600 AHCI: Hard Disk Corruption
On Tuesday, 27 of May 2008, Pavel Machek wrote:
> Hi!
>
> > > Can you try this one? It should prevent suspend in the broken cases,
> > > but allow it in mem=4G config.
> >
> > Sure!
> >
> > root@...ar:/usr/src/linux-2.6.25# patch -p1 < /home/pat/patch-2.6.26-rc3.gart-suspend
> > patching file arch/x86/kernel/pci-gart_64.c
> > Hunk #4 succeeded at 629 with fuzz 2 (offset 11 lines).
> >
> > .....make; cp bzImage /boot; reboot....
>
> Thanks!
>
> This goes on top of the second patch... it makes it work.
>
> Pavel
>
> For iommu suspend/resume code to work, functions it calls may not be
> __init.
>
> Signed-off-by: Pavel Machek <pavel@...e.cz>
I consolidated some of your patches sent in this thread and made the result
apply to the current -git. It hasn't been tested yet, but does it look good?
It's on top of the patch that adds the GART sysdev.
Thanks,
Rafael
---
Handle GART IOMMU suspend and resume.
Not-yet-signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
arch/x86/kernel/aperture_64.c | 34 ++++++++++++++++---------
arch/x86/kernel/k8.c | 2 -
arch/x86/kernel/pci-gart_64.c | 55 +++++++++++++++++++++++++++++-------------
include/asm-x86/gart.h | 2 +
4 files changed, 63 insertions(+), 30 deletions(-)
Index: linux-2.6/arch/x86/kernel/pci-gart_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/pci-gart_64.c
+++ linux-2.6/arch/x86/kernel/pci-gart_64.c
@@ -549,14 +549,50 @@ static __init unsigned read_aperture(str
return aper_base;
}
+static void enable_gart_translations(void)
+{
+ int i;
+
+ for (i = 0; i < num_k8_northbridges; i++) {
+ struct pci_dev *dev;
+ u32 gatt_reg;
+ u32 ctl;
+
+ dev = k8_northbridges[i];
+ gatt_reg = __pa(agp_gatt_table) >> 12;
+ gatt_reg <<= 4;
+ pci_write_config_dword(dev, 0x98, gatt_reg);
+ pci_read_config_dword(dev, 0x90, &ctl);
+
+ ctl |= 1;
+ ctl &= ~((1<<4) | (1<<5));
+
+ pci_write_config_dword(dev, 0x90, ctl);
+ }
+}
+
+static bool fix_north_bridges; /* call fix_up_north_bridges() on resume */
+static u32 aperture_order; /* arguments for fix_up_north_bridges() */
+static u32 aperture_alloc;
+
+void set_gart_resume_data(u32 aper_order, u32 aper_alloc)
+{
+ fix_north_bridges = true;
+ aperture_order = aper_order;
+ aperture_alloc = aper_alloc;
+}
+
static int gart_resume(struct sys_device *dev)
{
+ if (fix_north_bridges)
+ fix_up_north_bridges(aperture_order, aperture_alloc);
+ enable_gart_translations();
return 0;
}
static int gart_suspend(struct sys_device *dev, pm_message_t state)
{
- return -EINVAL;
+ return 0;
}
static struct sysdev_class gart_sysdev_class = {
@@ -613,27 +649,14 @@ static __init int init_k8_gatt(struct ag
memset(gatt, 0, gatt_size);
agp_gatt_table = gatt;
- for (i = 0; i < num_k8_northbridges; i++) {
- u32 gatt_reg;
- u32 ctl;
-
- dev = k8_northbridges[i];
- gatt_reg = __pa(gatt) >> 12;
- gatt_reg <<= 4;
- pci_write_config_dword(dev, 0x98, gatt_reg);
- pci_read_config_dword(dev, 0x90, &ctl);
-
- ctl |= 1;
- ctl &= ~((1<<4) | (1<<5));
-
- pci_write_config_dword(dev, 0x90, ctl);
- }
+ enable_gart_translations();
error = sysdev_class_register(&gart_sysdev_class);
if (!error)
error = sysdev_register(&device_gart);
if (error)
panic("Could not register gart_sysdev -- would corrupt data on next suspend");
+
flush_gart();
printk(KERN_INFO "PCI-DMA: aperture base @ %x size %u KB\n",
Index: linux-2.6/arch/x86/kernel/k8.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/k8.c
+++ linux-2.6/arch/x86/kernel/k8.c
@@ -76,7 +76,7 @@ EXPORT_SYMBOL_GPL(cache_k8_northbridges)
/* Ignores subdevice/subvendor but as far as I can figure out
they're useless anyways */
-int __init early_is_k8_nb(u32 device)
+int early_is_k8_nb(u32 device)
{
struct pci_device_id *id;
u32 vendor = device & 0xffff;
Index: linux-2.6/arch/x86/kernel/aperture_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/aperture_64.c
+++ linux-2.6/arch/x86/kernel/aperture_64.c
@@ -310,6 +310,25 @@ void __init early_gart_iommu_check(void)
}
+void fix_up_north_bridges(u32 aper_order, u32 aper_alloc)
+{
+ int num;
+
+ /* Fix up the north bridges */
+ for (num = 24; num < 32; num++) {
+ if (!early_is_k8_nb(read_pci_config(0, num, 3, 0x00)))
+ continue;
+
+ /*
+ * Don't enable translation yet. That is done later.
+ * Assume this BIOS didn't initialise the GART so
+ * just overwrite all previous bits
+ */
+ write_pci_config(0, num, 3, 0x90, aper_order << 1);
+ write_pci_config(0, num, 3, 0x94, aper_alloc >> 25);
+ }
+}
+
void __init gart_iommu_hole_init(void)
{
u32 aper_size, aper_alloc = 0, aper_order = 0, last_aper_order = 0;
@@ -400,17 +419,6 @@ void __init gart_iommu_hole_init(void)
return;
}
- /* Fix up the north bridges */
- for (num = 24; num < 32; num++) {
- if (!early_is_k8_nb(read_pci_config(0, num, 3, 0x00)))
- continue;
-
- /*
- * Don't enable translation yet. That is done later.
- * Assume this BIOS didn't initialise the GART so
- * just overwrite all previous bits
- */
- write_pci_config(0, num, 3, 0x90, aper_order<<1);
- write_pci_config(0, num, 3, 0x94, aper_alloc>>25);
- }
+ fix_up_north_bridges(aper_order, aper_alloc);
+ set_gart_resume_data(aper_order, aper_alloc);
}
Index: linux-2.6/include/asm-x86/gart.h
===================================================================
--- linux-2.6.orig/include/asm-x86/gart.h
+++ linux-2.6/include/asm-x86/gart.h
@@ -11,6 +11,8 @@ extern void gart_iommu_shutdown(void);
extern void __init gart_parse_options(char *);
extern void early_gart_iommu_check(void);
extern void gart_iommu_hole_init(void);
+extern void set_gart_resume_data(u32, u32);
+extern void fix_up_north_bridges(u32, u32);
extern int fallback_aper_order;
extern int fallback_aper_force;
extern int gart_iommu_aperture;
--
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