Modern IBM POWERPC systems support multiple (currently two) TCE tables
per IOMMU group (a.k.a. PE). This adds a iommu_table_group container
for TCE tables. Right now just one table is supported.
For P5IOC2 and IODA, iommu_table_group is embedded into PE struct
(pnv_ioda_pe and pnv_phb) and does not require iommu_free_table(), only .
iommu_reset_table().
For pSeries, this replaces multiple calls of kzalloc_node() with a new
iommu_pseries_group_alloc() helper and stores the table group struct
pointer into the pci_dn struct. For release, a iommu_table_group_free()
helper is added.
This should cause no behavioural change.
Signed-off-by: Alexey Kardashevskiy a...@ozlabs.ru
[aw: for the vfio related changes]
Acked-by: Alex Williamson alex.william...@redhat.com
---
Changes:
v9:
* s/it_group/it_table_group/
* added and used iommu_table_group_free(), from now iommu_free_table()
is only used for VIO
* added iommu_pseries_group_alloc()
* squashed powerpc/iommu: Introduce iommu_table_alloc() helper into this
---
arch/powerpc/include/asm/iommu.h| 18 +++--
arch/powerpc/include/asm/pci-bridge.h | 2 +-
arch/powerpc/kernel/eeh.c | 2 +-
arch/powerpc/kernel/iommu.c | 24 +++---
arch/powerpc/platforms/powernv/pci-ioda.c | 46 ++-
arch/powerpc/platforms/powernv/pci-p5ioc2.c | 19 +++--
arch/powerpc/platforms/powernv/pci.h| 4 +-
arch/powerpc/platforms/pseries/iommu.c | 104 +
drivers/vfio/vfio_iommu_spapr_tce.c | 114
9 files changed, 222 insertions(+), 111 deletions(-)
diff --git a/arch/powerpc/include/asm/iommu.h b/arch/powerpc/include/asm/iommu.h
index f0cab49..fa37519 100644
--- a/arch/powerpc/include/asm/iommu.h
+++ b/arch/powerpc/include/asm/iommu.h
@@ -91,9 +91,7 @@ struct iommu_table {
struct iommu_pool pools[IOMMU_NR_POOLS];
unsigned long *it_map; /* A simple allocation bitmap for now */
unsigned long it_page_shift;/* table iommu page size */
-#ifdef CONFIG_IOMMU_API
- struct iommu_group *it_group;
-#endif
+ struct iommu_table_group *it_table_group;
struct iommu_table_ops *it_ops;
void (*set_bypass)(struct iommu_table *tbl, bool enable);
};
@@ -127,14 +125,24 @@ extern void iommu_free_table(struct iommu_table *tbl,
const char *node_name);
*/
extern struct iommu_table *iommu_init_table(struct iommu_table * tbl,
int nid);
+
+#define IOMMU_TABLE_GROUP_MAX_TABLES 1
+
+struct iommu_table_group {
#ifdef CONFIG_IOMMU_API
-extern void iommu_register_group(struct iommu_table *tbl,
+ struct iommu_group *group;
+#endif
+ struct iommu_table tables[IOMMU_TABLE_GROUP_MAX_TABLES];
+};
+
+#ifdef CONFIG_IOMMU_API
+extern void iommu_register_group(struct iommu_table_group *table_group,
int pci_domain_number, unsigned long pe_num);
extern int iommu_add_device(struct device *dev);
extern void iommu_del_device(struct device *dev);
extern int __init tce_iommu_bus_notifier_init(void);
#else
-static inline void iommu_register_group(struct iommu_table *tbl,
+static inline void iommu_register_group(struct iommu_table_group *table_group,
int pci_domain_number,
unsigned long pe_num)
{
diff --git a/arch/powerpc/include/asm/pci-bridge.h
b/arch/powerpc/include/asm/pci-bridge.h
index 1811c44..e2d7479 100644
--- a/arch/powerpc/include/asm/pci-bridge.h
+++ b/arch/powerpc/include/asm/pci-bridge.h
@@ -185,7 +185,7 @@ struct pci_dn {
struct pci_dn *parent;
struct pci_controller *phb;/* for pci devices */
- struct iommu_table *iommu_table; /* for phb's or bridges */
+ struct iommu_table_group *table_group; /* for phb's or bridges */
struct device_node *node; /* back-pointer to the device_node */
int pci_ext_config_space; /* for pci devices */
diff --git a/arch/powerpc/kernel/eeh.c b/arch/powerpc/kernel/eeh.c
index a4c62eb..6bab695 100644
--- a/arch/powerpc/kernel/eeh.c
+++ b/arch/powerpc/kernel/eeh.c
@@ -1407,7 +1407,7 @@ static int dev_has_iommu_table(struct device *dev, void
*data)
return 0;
tbl = get_iommu_table_base(dev);
- if (tbl tbl-it_group) {
+ if (tbl tbl-it_table_group) {
*ppdev = pdev;
return 1;
}
diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index e289f91..005146b 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -749,12 +749,8 @@ void iommu_free_table(struct iommu_table *tbl, const char
*node_name)
iommu_reset_table(tbl, node_name);
-#ifdef CONFIG_IOMMU_API
- if (tbl-it_group) {
- iommu_group_put(tbl-it_group);
- BUG_ON(tbl-it_group);
- }
-#endif
+ /* iommu_free_table() is only used by VIO
