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SubjectRe: >3G => iommu => suspend problems -- was Re: SB600 AHCI: Hard Disk Corruption
Hi!

> > > > iommu problem? Try it with mem=3G.
> > >
> > > YES! :-) How did you know?
> >
> > Guess how... I hit it myself.
> >
> > > So how are we going to get this fixed???
> >
> > Write a patch, submit it? ;-).
>
> Can you try this one? It should prevent suspend in the broken cases,
> but allow it in mem=4G config.

Apply this on top of previous patch, and you may get working system
_and_ all the memory...

Add resume support to pci-gart_64.c. This is neccessary for resume not
to currupt disk on >3GB machines.

Signed-off-by: Pavel Machek <pavel@suse.cz>

---
commit cc8201de538dda6c17e03fe495146e7fc755f64d
tree 9f4ece8312b59e6e14eb3a38d489ff37070d6cf1
parent db95a81f7f2106655c6ceb05a38300fd26f6ea3f
author Pavel <pavel@amd.ucw.cz> Tue, 27 May 2008 12:23:45 +0200
committer Pavel <pavel@amd.ucw.cz> Tue, 27 May 2008 12:23:45 +0200
arch/x86/kernel/aperture_64.c | 45 +++++++++++++++++++++++++++--------------
arch/x86/kernel/pci-gart_64.c | 28 ++++++++++++++++++++------
drivers/char/agp/generic.c | 2 +-
include/asm-x86/gart.h | 1 +
4 files changed, 54 insertions(+), 22 deletions(-)
diff --git a/arch/x86/kernel/aperture_64.c b/arch/x86/kernel/aperture_64.c
index 2088b6a..2571dc4 100644
--- a/arch/x86/kernel/aperture_64.c
+++ b/arch/x86/kernel/aperture_64.c
@@ -302,6 +302,32 @@ void __init early_gart_iommu_check(void)

}

+u32 fix_aper_enabled, fix_aper_order, fix_aper_alloc;
+
+void fix_up_north_bridges(void)
+{
+ int num;
+ if (!fix_aper_enabled)
+ 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
+ * by enable_gart_translation.
+ *
+ * Assume this BIOS didn't initialise the GART so
+ * just overwrite all previous bits
+ */
+ write_pci_config(0, num, 3, AMD64_GARTAPERTURECTL, fix_aper_order<<1);
+ write_pci_config(0, num, 3, AMD64_GARTAPERTUREBASE, fix_aper_alloc>>25);
+ }
+}
+
+
void __init gart_iommu_hole_init(void)
{
u32 aper_size, aper_alloc = 0, aper_order = 0, last_aper_order = 0;
@@ -393,19 +419,8 @@ 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
- * by enable_gart_translation.
- *
- * Assume this BIOS didn't initialise the GART so
- * just overwrite all previous bits
- */
- write_pci_config(0, num, 3, AMD64_GARTAPERTURECTL, aper_order<<1);
- write_pci_config(0, num, 3, AMD64_GARTAPERTUREBASE, aper_alloc>>25);
- }
+ fix_aper_enabled = 1;
+ fix_aper_order = aper_order;
+ fix_aper_alloc = aper_alloc;
+ fix_up_north_bridges();
}
diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index 926af9c..dbd3000 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -549,14 +549,27 @@ static __init unsigned read_aperture(str
return aper_base;
}

+static void enable_gart_translations(void)
+{
+ int i;
+ struct pci_dev *dev;
+
+ for (i = 0; i < num_k8_northbridges; i++) {
+ dev = k8_northbridges[i];
+ enable_gart_translation(dev, __pa(agp_gatt_table));
+ }
+}
+
static int gart_resume(struct sys_device *dev)
{
+ fix_up_north_bridges();
+ 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 = {
@@ -571,6 +584,7 @@ static struct sys_device device_gart = {
.cls = &gart_sysdev_class,
};

+
/*
* Private Northbridge GATT initialization in case we cannot use the
* AGP driver for some reason.
@@ -614,11 +628,8 @@ 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++) {
- dev = k8_northbridges[i];
- enable_gart_translation(dev, __pa(gatt));
- }
-
+ enable_gart_translations();
+
error = sysdev_class_register(&gart_sysdev_class);
if (!error)
error = sysdev_register(&device_gart);
@@ -651,6 +662,11 @@ static const struct dma_mapping_ops gart
.unmap_sg = gart_unmap_sg,
};

+/* Called from native_machine_shutdown; should this use regular
+ * shutdown call from sysdev? Why is this needed at all? Some broken
+ * BIOS can't cope with gart enabled during reboot?
+ */
+
void gart_iommu_shutdown(void)
{
struct pci_dev *dev;
diff --git a/drivers/char/agp/generic.c b/drivers/char/agp/generic.c
index 7fc0c99..7fb4d5b 100644
--- a/drivers/char/agp/generic.c
+++ b/drivers/char/agp/generic.c
@@ -43,7 +43,7 @@ #include <asm/cacheflush.h>
#include <asm/pgtable.h>
#include "agp.h"

-__u32 *agp_gatt_table;
+u32 *agp_gatt_table;
int agp_memory_reserved;

/*
diff --git a/include/asm-x86/gart.h b/include/asm-x86/gart.h
index f37d83b..6f27b14 100644
--- a/include/asm-x86/gart.h
+++ b/include/asm-x86/gart.h
@@ -93,5 +93,6 @@ static inline int __aperture_valid(u64 a
return 1;
}

+extern void fix_up_north_bridges(void);

#endif

--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html


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