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SubjectRe: [PATCH] x86[-64] PCI domain support
On Thu, Sep 28, 2006 at 05:45:41AM -0400, Jeff Garzik wrote:
> Muli Ben-Yehuda wrote:
> >On Tue, Sep 26, 2006 at 03:15:08PM -0400, Jeff Garzik wrote:
> >>The x86[-64] PCI domain effort needs to be restarted, because we've got
> >>machines out in the field that need this in order for some devices to
> >>work.
> >>
> >This breaks the Calgary IOMMU, since it uses sysdata for other
> >purposes (going back from a bus to its IO address space). I'm looking
> >into it.
>
> You'll need to modify struct pci_sysdata in
> include/asm-{i386,x86_64}/pci.h to include the data that you previously
> stored directly into the sysdata pointer.

Something like this should do the trick. Note - this should not be
applied yet - after several gigabytes of network and disk activity it
takes aic94xx down. More investigation required.

diff -Naurp -X /home/muli/w/dontdiff pci-domains/arch/x86_64/kernel/pci-calgary.c linux/arch/x86_64/kernel/pci-calgary.c
--- pci-domains/arch/x86_64/kernel/pci-calgary.c 2006-09-28 13:31:14.000000000 +0300
+++ linux/arch/x86_64/kernel/pci-calgary.c 2006-09-28 13:14:38.000000000 +0300
@@ -317,7 +317,7 @@ void calgary_unmap_sg(struct device *dev
int nelems, int direction)
{
unsigned long flags;
- struct iommu_table *tbl = to_pci_dev(dev)->bus->self->sysdata;
+ struct iommu_table *tbl = pci_iommu(to_pci_dev(dev)->bus);

if (!translate_phb(to_pci_dev(dev)))
return;
@@ -346,7 +346,7 @@ static int calgary_nontranslate_map_sg(s
int calgary_map_sg(struct device *dev, struct scatterlist *sg,
int nelems, int direction)
{
- struct iommu_table *tbl = to_pci_dev(dev)->bus->self->sysdata;
+ struct iommu_table *tbl = pci_iommu(to_pci_dev(dev)->bus);
unsigned long flags;
unsigned long vaddr;
unsigned int npages;
@@ -400,7 +400,7 @@ dma_addr_t calgary_map_single(struct dev
dma_addr_t dma_handle = bad_dma_address;
unsigned long uaddr;
unsigned int npages;
- struct iommu_table *tbl = to_pci_dev(dev)->bus->self->sysdata;
+ struct iommu_table *tbl = pci_iommu(to_pci_dev(dev)->bus);

uaddr = (unsigned long)vaddr;
npages = num_dma_pages(uaddr, size);
@@ -416,7 +416,7 @@ dma_addr_t calgary_map_single(struct dev
void calgary_unmap_single(struct device *dev, dma_addr_t dma_handle,
size_t size, int direction)
{
- struct iommu_table *tbl = to_pci_dev(dev)->bus->self->sysdata;
+ struct iommu_table *tbl = pci_iommu(to_pci_dev(dev)->bus);
unsigned int npages;

if (!translate_phb(to_pci_dev(dev)))
@@ -434,7 +434,7 @@ void* calgary_alloc_coherent(struct devi
unsigned int npages, order;
struct iommu_table *tbl;

- tbl = to_pci_dev(dev)->bus->self->sysdata;
+ tbl = pci_iommu(to_pci_dev(dev)->bus);

size = PAGE_ALIGN(size); /* size rounded up to full pages */
npages = size >> PAGE_SHIFT;
@@ -551,7 +551,7 @@ static void __init calgary_reserve_mem_r
limit++;

numpages = ((limit - start) >> PAGE_SHIFT);
- iommu_range_reserve(dev->sysdata, start, numpages);
+ iommu_range_reserve(pci_iommu(dev->bus), start, numpages);
}

static void __init calgary_reserve_peripheral_mem_1(struct pci_dev *dev)
@@ -559,7 +559,7 @@ static void __init calgary_reserve_perip
void __iomem *target;
u64 low, high, sizelow;
u64 start, limit;
- struct iommu_table *tbl = dev->sysdata;
+ struct iommu_table *tbl = pci_iommu(dev->bus);
unsigned char busnum = dev->bus->number;
void __iomem *bbar = tbl->bbar;

@@ -583,7 +583,7 @@ static void __init calgary_reserve_perip
u32 val32;
u64 low, high, sizelow, sizehigh;
u64 start, limit;
- struct iommu_table *tbl = dev->sysdata;
+ struct iommu_table *tbl = pci_iommu(dev->bus);
unsigned char busnum = dev->bus->number;
void __iomem *bbar = tbl->bbar;

@@ -621,7 +621,7 @@ static void __init calgary_reserve_regio
void __iomem *bbar;
unsigned char busnum;
u64 start;
- struct iommu_table *tbl = dev->sysdata;
+ struct iommu_table *tbl = pci_iommu(dev->bus);

bbar = tbl->bbar;
busnum = dev->bus->number;
@@ -652,7 +652,7 @@ static int __init calgary_setup_tar(stru
if (ret)
return ret;

- tbl = dev->sysdata;
+ tbl = pci_iommu(dev->bus);
tbl->it_base = (unsigned long)bus_info[dev->bus->number].tce_space;
tce_free(tbl, 0, tbl->it_size);

@@ -665,7 +665,7 @@ static int __init calgary_setup_tar(stru
/* zero out all TAR bits under sw control */
val64 &= ~TAR_SW_BITS;

- tbl = dev->sysdata;
+ tbl = pci_iommu(dev->bus);
table_phys = (u64)__pa(tbl->it_base);
val64 |= table_phys;

@@ -682,7 +682,7 @@ static int __init calgary_setup_tar(stru
static void __init calgary_free_bus(struct pci_dev *dev)
{
u64 val64;
- struct iommu_table *tbl = dev->sysdata;
+ struct iommu_table *tbl = pci_iommu(dev->bus);
void __iomem *target;
unsigned int bitmapsz;

@@ -697,7 +697,8 @@ static void __init calgary_free_bus(stru
tbl->it_map = NULL;

kfree(tbl);
- dev->sysdata = NULL;
+
+ set_pci_iommu(dev->bus, NULL);

/* Can't free bootmem allocated memory after system is up :-( */
bus_info[dev->bus->number].tce_space = NULL;
@@ -706,7 +707,7 @@ static void __init calgary_free_bus(stru
static void calgary_watchdog(unsigned long data)
{
struct pci_dev *dev = (struct pci_dev *)data;
- struct iommu_table *tbl = dev->sysdata;
+ struct iommu_table *tbl = pci_iommu(dev->bus);
void __iomem *bbar = tbl->bbar;
u32 val32;
void __iomem *target;
@@ -742,7 +743,7 @@ static void __init calgary_enable_transl
struct iommu_table *tbl;

busnum = dev->bus->number;
- tbl = dev->sysdata;
+ tbl = pci_iommu(dev->bus);
bbar = tbl->bbar;

/* enable TCE in PHB Config Register */
@@ -772,7 +773,7 @@ static void __init calgary_disable_trans
struct iommu_table *tbl;

busnum = dev->bus->number;
- tbl = dev->sysdata;
+ tbl = pci_iommu(dev->bus);
bbar = tbl->bbar;

/* disable TCE in PHB Config Register */
@@ -813,8 +814,7 @@ static inline unsigned int __init locate
static void __init calgary_init_one_nontraslated(struct pci_dev *dev)
{
pci_dev_get(dev);
- dev->sysdata = NULL;
- dev->bus->self = dev;
+ set_pci_iommu(dev->bus, NULL);
}

static int __init calgary_init_one(struct pci_dev *dev)
diff -Naurp -X /home/muli/w/dontdiff pci-domains/arch/x86_64/kernel/tce.c linux/arch/x86_64/kernel/tce.c
--- pci-domains/arch/x86_64/kernel/tce.c 2006-09-28 13:31:14.000000000 +0300
+++ linux/arch/x86_64/kernel/tce.c 2006-09-28 13:40:52.000000000 +0300
@@ -137,9 +137,9 @@ int build_tce_table(struct pci_dev *dev,
struct iommu_table *tbl;
int ret;

- if (dev->sysdata) {
- printk(KERN_ERR "Calgary: dev %p has sysdata %p\n",
- dev, dev->sysdata);
+ if (pci_iommu(dev->bus)) {
+ printk(KERN_ERR "Calgary: dev %p has sysdata->iommu %p\n",
+ dev, pci_iommu(dev->bus));
BUG();
}

@@ -156,11 +156,7 @@ int build_tce_table(struct pci_dev *dev,

tbl->bbar = bbar;

- /*
- * NUMA is already using the bus's sysdata pointer, so we use
- * the bus's pci_dev's sysdata instead.
- */
- dev->sysdata = tbl;
+ set_pci_iommu(dev->bus, tbl);

return 0;

diff -Naurp -X /home/muli/w/dontdiff pci-domains/include/asm-x86_64/pci.h linux/include/asm-x86_64/pci.h
--- pci-domains/include/asm-x86_64/pci.h 2006-09-28 13:34:05.000000000 +0300
+++ linux/include/asm-x86_64/pci.h 2006-09-28 15:19:56.000000000 +0300
@@ -8,6 +8,7 @@
struct pci_sysdata {
int domain; /* PCI domain */
int node; /* NUMA node */
+ void* iommu; /* IOMMU private data */
};

#ifdef CONFIG_PCI_DOMAINS
@@ -23,6 +24,20 @@ static inline int pci_proc_domain(struct
}
#endif /* CONFIG_PCI_DOMAINS */

+#ifdef CONFIG_CALGARY_IOMMU
+static inline void* pci_iommu(struct pci_bus *bus)
+{
+ struct pci_sysdata *sd = bus->sysdata;
+ return sd->iommu;
+}
+
+static inline void set_pci_iommu(struct pci_bus *bus, void *val)
+{
+ struct pci_sysdata *sd = bus->sysdata;
+ sd->iommu = val;
+}
+#endif /* CONFIG_CALGARY_IOMMU */
+
#include <linux/mm.h> /* for struct page */

/* Can be used to override the logic in pci_scan_bus for skipping
-
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