[PATCH kernel v7 12/31] powerpc/spapr: vfio: Switch from iommu_table to new iommu_table_group

From: Alexey Kardashevskiy
Date: Fri Mar 27 2015 - 11:02:00 EST

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.

Signed-off-by: Alexey Kardashevskiy <aik@xxxxxxxxx>
---
Documentation/vfio.txt | 23 ++++++
arch/powerpc/include/asm/iommu.h | 18 +++--
arch/powerpc/kernel/iommu.c | 34 ++++----
arch/powerpc/platforms/powernv/pci-ioda.c | 38 +++++----
arch/powerpc/platforms/powernv/pci-p5ioc2.c | 17 ++--
arch/powerpc/platforms/powernv/pci.c | 2 +-
arch/powerpc/platforms/powernv/pci.h | 4 +-
arch/powerpc/platforms/pseries/iommu.c | 9 ++-
drivers/vfio/vfio_iommu_spapr_tce.c | 120 ++++++++++++++++++++--------
9 files changed, 183 insertions(+), 82 deletions(-)

diff --git a/Documentation/vfio.txt b/Documentation/vfio.txt
index 96978ec..94328c8 100644
--- a/Documentation/vfio.txt
+++ b/Documentation/vfio.txt
@@ -427,6 +427,29 @@ The code flow from the example above should be slightly changed:

....

+5) There is v2 of SPAPR TCE IOMMU. It deprecates VFIO_IOMMU_ENABLE/
+VFIO_IOMMU_DISABLE and implements 2 new ioctls:
+VFIO_IOMMU_SPAPR_REGISTER_MEMORY and VFIO_IOMMU_SPAPR_UNREGISTER_MEMORY
+(which are unsupported in v1 IOMMU).
+
+PPC64 paravirtualized guests generate a lot of map/unmap requests,
+and the handling of those includes pinning/unpinning pages and updating
+mm::locked_vm counter to make sure we do not exceed the rlimit.
+The v2 IOMMU splits accounting and pinning into separate operations:
+
+- VFIO_IOMMU_SPAPR_REGISTER_MEMORY/VFIO_IOMMU_SPAPR_UNREGISTER_MEMORY ioctls
+receive a user space address and size of the block to be pinned.
+Bisecting is not supported and VFIO_IOMMU_UNREGISTER_MEMORY is expected to
+be called with the exact address and size used for registering
+the memory block. The userspace is not expected to call these often.
+The ranges are stored in a linked list in a VFIO container.
+
+- VFIO_IOMMU_MAP_DMA/VFIO_IOMMU_UNMAP_DMA ioctls only update the actual
+IOMMU table and do not do pinning; instead these check that the userspace
+address is from pre-registered range.
+
+This separation helps in optimizing DMA for guests.
+
-------------------------------------------------------------------------------

[1] VFIO was originally an acronym for "Virtual Function I/O" in its
diff --git a/arch/powerpc/include/asm/iommu.h b/arch/powerpc/include/asm/iommu.h
index eb75726..667aa1a 100644
--- a/arch/powerpc/include/asm/iommu.h
+++ b/arch/powerpc/include/asm/iommu.h
@@ -90,9 +90,7 @@ 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_group;
struct iommu_table_ops *it_ops;
void (*set_bypass)(struct iommu_table *tbl, bool enable);
};
@@ -126,14 +124,24 @@ 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/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index b39d00a..fd49c8e 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -712,17 +712,20 @@ struct iommu_table *iommu_init_table(struct iommu_table *tbl, int nid)

struct iommu_table *iommu_table_alloc(int node)
{
- struct iommu_table *tbl;
+ struct iommu_table_group *table_group;

- tbl = kzalloc_node(sizeof(struct iommu_table), GFP_KERNEL, node);
+ table_group = kzalloc_node(sizeof(struct iommu_table_group), GFP_KERNEL,
+ node);
+ table_group->tables[0].it_group = table_group;

- return tbl;
+ return &table_group->tables[0];
}

void iommu_free_table(struct iommu_table *tbl, const char *node_name)
{
unsigned long bitmap_sz;
unsigned int order;
+ struct iommu_table_group *table_group = tbl->it_group;

if (!tbl || !tbl->it_map) {
printk(KERN_ERR "%s: expected TCE map for %s\n", __func__,
@@ -738,9 +741,9 @@ void iommu_free_table(struct iommu_table *tbl, const char *node_name)
clear_bit(0, tbl->it_map);

#ifdef CONFIG_IOMMU_API
- if (tbl->it_group) {
- iommu_group_put(tbl->it_group);
- BUG_ON(tbl->it_group);
+ if (table_group->group) {
+ iommu_group_put(table_group->group);
+ BUG_ON(table_group->group);
}
#endif

@@ -756,7 +759,7 @@ void iommu_free_table(struct iommu_table *tbl, const char *node_name)
free_pages((unsigned long) tbl->it_map, order);

/* free table */
- kfree(tbl);
+ kfree(table_group);
}

/* Creates TCEs for a user provided buffer. The user buffer must be
@@ -903,11 +906,12 @@ EXPORT_SYMBOL_GPL(iommu_direction_to_tce_perm);
*/
static void group_release(void *iommu_data)
{
- struct iommu_table *tbl = iommu_data;
- tbl->it_group = NULL;
+ struct iommu_table_group *table_group = iommu_data;
+
+ table_group->group = NULL;
}

-void iommu_register_group(struct iommu_table *tbl,
+void iommu_register_group(struct iommu_table_group *table_group,
int pci_domain_number, unsigned long pe_num)
{
struct iommu_group *grp;
@@ -919,8 +923,8 @@ void iommu_register_group(struct iommu_table *tbl,
PTR_ERR(grp));
return;
}
- tbl->it_group = grp;
- iommu_group_set_iommudata(grp, tbl, group_release);
+ table_group->group = grp;
+ iommu_group_set_iommudata(grp, table_group, group_release);
name = kasprintf(GFP_KERNEL, "domain%d-pe%lx",
pci_domain_number, pe_num);
if (!name)
@@ -1108,7 +1112,7 @@ int iommu_add_device(struct device *dev)
}

tbl = get_iommu_table_base(dev);
- if (!tbl || !tbl->it_group) {
+ if (!tbl || !tbl->it_group || !tbl->it_group->group) {
pr_debug("%s: Skipping device %s with no tbl\n",
__func__, dev_name(dev));
return 0;
@@ -1116,7 +1120,7 @@ int iommu_add_device(struct device *dev)

pr_debug("%s: Adding %s to iommu group %d\n",
__func__, dev_name(dev),
- iommu_group_id(tbl->it_group));
+ iommu_group_id(tbl->it_group->group));

if (PAGE_SIZE < IOMMU_PAGE_SIZE(tbl)) {
pr_err("%s: Invalid IOMMU page size %lx (%lx) on %s\n",
@@ -1125,7 +1129,7 @@ int iommu_add_device(struct device *dev)
return -EINVAL;
}

- return iommu_group_add_device(tbl->it_group, dev);
+ return iommu_group_add_device(tbl->it_group->group, dev);
}
EXPORT_SYMBOL_GPL(iommu_add_device);

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 85e64a5..a964c50 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -23,6 +23,7 @@
#include <linux/io.h>
#include <linux/msi.h>
#include <linux/memblock.h>
+#include <linux/iommu.h>

#include <asm/sections.h>
#include <asm/io.h>
@@ -989,7 +990,7 @@ static void pnv_pci_ioda_dma_dev_setup(struct pnv_phb *phb, struct pci_dev *pdev

pe = &phb->ioda.pe_array[pdn->pe_number];
WARN_ON(get_dma_ops(&pdev->dev) != &dma_iommu_ops);
- set_iommu_table_base_and_group(&pdev->dev, &pe->tce32_table);
+ set_iommu_table_base_and_group(&pdev->dev, &pe->table_group.tables[0]);
}

static int pnv_pci_ioda_dma_set_mask(struct pnv_phb *phb,
@@ -1016,7 +1017,7 @@ static int pnv_pci_ioda_dma_set_mask(struct pnv_phb *phb,
} else {
dev_info(&pdev->dev, "Using 32-bit DMA via iommu\n");
set_dma_ops(&pdev->dev, &dma_iommu_ops);
- set_iommu_table_base(&pdev->dev, &pe->tce32_table);
+ set_iommu_table_base(&pdev->dev, &pe->table_group.tables[0]);
}
*pdev->dev.dma_mask = dma_mask;
return 0;
@@ -1053,9 +1054,10 @@ static void pnv_ioda_setup_bus_dma(struct pnv_ioda_pe *pe,
list_for_each_entry(dev, &bus->devices, bus_list) {
if (add_to_iommu_group)
set_iommu_table_base_and_group(&dev->dev,
- &pe->tce32_table);
+ &pe->table_group.tables[0]);
else
- set_iommu_table_base(&dev->dev, &pe->tce32_table);
+ set_iommu_table_base(&dev->dev,
+ &pe->table_group.tables[0]);

if (dev->subordinate)
pnv_ioda_setup_bus_dma(pe, dev->subordinate,
@@ -1145,8 +1147,8 @@ static void pnv_pci_ioda2_tce_invalidate(struct pnv_ioda_pe *pe,
void pnv_pci_ioda_tce_invalidate(struct iommu_table *tbl,
__be64 *startp, __be64 *endp, bool rm)
{
- struct pnv_ioda_pe *pe = container_of(tbl, struct pnv_ioda_pe,
- tce32_table);
+ struct pnv_ioda_pe *pe = container_of(tbl->it_group, struct pnv_ioda_pe,
+ table_group);
struct pnv_phb *phb = pe->phb;

if (phb->type == PNV_PHB_IODA1)
@@ -1211,8 +1213,11 @@ static void pnv_pci_ioda_setup_dma_pe(struct pnv_phb *phb,
}
}

+ /* Setup iommu */
+ pe->table_group.tables[0].it_group = &pe->table_group;
+
/* Setup linux iommu table */
- tbl = &pe->tce32_table;
+ tbl = &pe->table_group.tables[0];
pnv_pci_setup_iommu_table(tbl, addr, TCE32_TABLE_SIZE * segs,
base << 28, IOMMU_PAGE_SHIFT_4K);

@@ -1233,7 +1238,8 @@ static void pnv_pci_ioda_setup_dma_pe(struct pnv_phb *phb,
}
tbl->it_ops = &pnv_iommu_ops;
iommu_init_table(tbl, phb->hose->node);
- iommu_register_group(tbl, phb->hose->global_number, pe->pe_number);
+ iommu_register_group(&pe->table_group, phb->hose->global_number,
+ pe->pe_number);

if (pe->pdev)
set_iommu_table_base_and_group(&pe->pdev->dev, tbl);
@@ -1251,8 +1257,8 @@ static void pnv_pci_ioda_setup_dma_pe(struct pnv_phb *phb,

static void pnv_pci_ioda2_set_bypass(struct iommu_table *tbl, bool enable)
{
- struct pnv_ioda_pe *pe = container_of(tbl, struct pnv_ioda_pe,
- tce32_table);
+ struct pnv_ioda_pe *pe = container_of(tbl->it_group, struct pnv_ioda_pe,
+ table_group);
uint16_t window_id = (pe->pe_number << 1 ) + 1;
int64_t rc;

@@ -1297,10 +1303,10 @@ static void pnv_pci_ioda2_setup_bypass_pe(struct pnv_phb *phb,
pe->tce_bypass_base = 1ull << 59;

/* Install set_bypass callback for VFIO */
- pe->tce32_table.set_bypass = pnv_pci_ioda2_set_bypass;
+ pe->table_group.tables[0].set_bypass = pnv_pci_ioda2_set_bypass;

/* Enable bypass by default */
- pnv_pci_ioda2_set_bypass(&pe->tce32_table, true);
+ pnv_pci_ioda2_set_bypass(&pe->table_group.tables[0], true);
}

static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
@@ -1347,8 +1353,11 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
goto fail;
}

+ /* Setup iommu */
+ pe->table_group.tables[0].it_group = &pe->table_group;
+
/* Setup linux iommu table */
- tbl = &pe->tce32_table;
+ tbl = &pe->table_group.tables[0];
pnv_pci_setup_iommu_table(tbl, addr, tce_table_size, 0,
IOMMU_PAGE_SHIFT_4K);

@@ -1367,7 +1376,8 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
}
tbl->it_ops = &pnv_iommu_ops;
iommu_init_table(tbl, phb->hose->node);
- iommu_register_group(tbl, phb->hose->global_number, pe->pe_number);
+ iommu_register_group(&pe->table_group, phb->hose->global_number,
+ pe->pe_number);

if (pe->pdev)
set_iommu_table_base_and_group(&pe->pdev->dev, tbl);
diff --git a/arch/powerpc/platforms/powernv/pci-p5ioc2.c b/arch/powerpc/platforms/powernv/pci-p5ioc2.c
index 0256fcc..ff68cac 100644
--- a/arch/powerpc/platforms/powernv/pci-p5ioc2.c
+++ b/arch/powerpc/platforms/powernv/pci-p5ioc2.c
@@ -86,14 +86,16 @@ static void pnv_pci_init_p5ioc2_msis(struct pnv_phb *phb) { }
static void pnv_pci_p5ioc2_dma_dev_setup(struct pnv_phb *phb,
struct pci_dev *pdev)
{
- if (phb->p5ioc2.iommu_table.it_map == NULL) {
- phb->p5ioc2.iommu_table.it_ops = &pnv_iommu_ops;
- iommu_init_table(&phb->p5ioc2.iommu_table, phb->hose->node);
- iommu_register_group(&phb->p5ioc2.iommu_table,
+ if (phb->p5ioc2.table_group.tables[0].it_map == NULL) {
+ phb->p5ioc2.table_group.tables[0].it_ops = &pnv_iommu_ops;
+ iommu_init_table(&phb->p5ioc2.table_group.tables[0],
+ phb->hose->node);
+ iommu_register_group(&phb->p5ioc2.table_group,
pci_domain_nr(phb->hose->bus), phb->opal_id);
}

- set_iommu_table_base_and_group(&pdev->dev, &phb->p5ioc2.iommu_table);
+ set_iommu_table_base_and_group(&pdev->dev,
+ &phb->p5ioc2.table_group.tables[0]);
}

static void __init pnv_pci_init_p5ioc2_phb(struct device_node *np, u64 hub_id,
@@ -167,9 +169,12 @@ static void __init pnv_pci_init_p5ioc2_phb(struct device_node *np, u64 hub_id,
/* Setup MSI support */
pnv_pci_init_p5ioc2_msis(phb);

+ /* Setup iommu */
+ phb->p5ioc2.table_group.tables[0].it_group = &phb->p5ioc2.table_group;
+
/* Setup TCEs */
phb->dma_dev_setup = pnv_pci_p5ioc2_dma_dev_setup;
- pnv_pci_setup_iommu_table(&phb->p5ioc2.iommu_table,
+ pnv_pci_setup_iommu_table(&phb->p5ioc2.table_group.tables[0],
tce_mem, tce_size, 0,
IOMMU_PAGE_SHIFT_4K);
}
diff --git a/arch/powerpc/platforms/powernv/pci.c b/arch/powerpc/platforms/powernv/pci.c
index 1c31ac8..3050cc8 100644
--- a/arch/powerpc/platforms/powernv/pci.c
+++ b/arch/powerpc/platforms/powernv/pci.c
@@ -687,7 +687,7 @@ static struct iommu_table *pnv_pci_setup_bml_iommu(struct pci_controller *hose)
be32_to_cpup(sizep), 0, IOMMU_PAGE_SHIFT_4K);
tbl->it_ops = &pnv_iommu_ops;
iommu_init_table(tbl, hose->node);
- iommu_register_group(tbl, pci_domain_nr(hose->bus), 0);
+ iommu_register_group(tbl->it_group, pci_domain_nr(hose->bus), 0);

/* Deal with SW invalidated TCEs when needed (BML way) */
swinvp = of_get_property(hose->dn, "linux,tce-sw-invalidate-info",
diff --git a/arch/powerpc/platforms/powernv/pci.h b/arch/powerpc/platforms/powernv/pci.h
index f726700..762d906 100644
--- a/arch/powerpc/platforms/powernv/pci.h
+++ b/arch/powerpc/platforms/powernv/pci.h
@@ -53,7 +53,7 @@ struct pnv_ioda_pe {
/* "Base" iommu table, ie, 4K TCEs, 32-bit DMA */
int tce32_seg;
int tce32_segcount;
- struct iommu_table tce32_table;
+ struct iommu_table_group table_group;
phys_addr_t tce_inval_reg_phys;

/* 64-bit TCE bypass region */
@@ -138,7 +138,7 @@ struct pnv_phb {

union {
struct {
- struct iommu_table iommu_table;
+ struct iommu_table_group table_group;
} p5ioc2;

struct {
diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
index 41a8b14..75ea581 100644
--- a/arch/powerpc/platforms/pseries/iommu.c
+++ b/arch/powerpc/platforms/pseries/iommu.c
@@ -622,7 +622,7 @@ static void pci_dma_bus_setup_pSeries(struct pci_bus *bus)
iommu_table_setparms(pci->phb, dn, tbl);
tbl->it_ops = &iommu_table_pseries_ops;
pci->iommu_table = iommu_init_table(tbl, pci->phb->node);
- iommu_register_group(tbl, pci_domain_nr(bus), 0);
+ iommu_register_group(tbl->it_group, pci_domain_nr(bus), 0);

/* Divide the rest (1.75GB) among the children */
pci->phb->dma_window_size = 0x80000000ul;
@@ -672,7 +672,7 @@ static void pci_dma_bus_setup_pSeriesLP(struct pci_bus *bus)
iommu_table_setparms_lpar(ppci->phb, pdn, tbl, dma_window);
tbl->it_ops = &iommu_table_lpar_multi_ops;
ppci->iommu_table = iommu_init_table(tbl, ppci->phb->node);
- iommu_register_group(tbl, pci_domain_nr(bus), 0);
+ iommu_register_group(tbl->it_group, pci_domain_nr(bus), 0);
pr_debug(" created table: %p\n", ppci->iommu_table);
}
}
@@ -699,7 +699,7 @@ static void pci_dma_dev_setup_pSeries(struct pci_dev *dev)
iommu_table_setparms(phb, dn, tbl);
tbl->it_ops = &iommu_table_pseries_ops;
PCI_DN(dn)->iommu_table = iommu_init_table(tbl, phb->node);
- iommu_register_group(tbl, pci_domain_nr(phb->bus), 0);
+ iommu_register_group(tbl->it_group, pci_domain_nr(phb->bus), 0);
set_iommu_table_base_and_group(&dev->dev,
PCI_DN(dn)->iommu_table);
return;
@@ -1121,7 +1121,8 @@ static void pci_dma_dev_setup_pSeriesLP(struct pci_dev *dev)
iommu_table_setparms_lpar(pci->phb, pdn, tbl, dma_window);
tbl->it_ops = &iommu_table_lpar_multi_ops;
pci->iommu_table = iommu_init_table(tbl, pci->phb->node);
- iommu_register_group(tbl, pci_domain_nr(pci->phb->bus), 0);
+ iommu_register_group(tbl->it_group,
+ pci_domain_nr(pci->phb->bus), 0);
pr_debug(" created table: %p\n", pci->iommu_table);
} else {
pr_debug(" found DMA window, table: %p\n", pci->iommu_table);
diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c
index 244c958..d61aad2 100644
--- a/drivers/vfio/vfio_iommu_spapr_tce.c
+++ b/drivers/vfio/vfio_iommu_spapr_tce.c
@@ -88,7 +88,7 @@ static void decrement_locked_vm(long npages)
*/
struct tce_container {
struct mutex lock;
- struct iommu_table *tbl;
+ struct iommu_group *grp;
bool enabled;
unsigned long locked_pages;
};
@@ -103,13 +103,41 @@ static bool tce_page_is_contained(struct page *page, unsigned page_shift)
return (PAGE_SHIFT + compound_order(compound_head(page))) >= page_shift;
}

+static struct iommu_table *spapr_tce_find_table(
+ struct tce_container *container,
+ phys_addr_t ioba)
+{
+ long i;
+ struct iommu_table *ret = NULL;
+ struct iommu_table_group *table_group;
+
+ table_group = iommu_group_get_iommudata(container->grp);
+ if (!table_group)
+ return NULL;
+
+ for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
+ struct iommu_table *tbl = &table_group->tables[i];
+ unsigned long entry = ioba >> tbl->it_page_shift;
+ unsigned long start = tbl->it_offset;
+ unsigned long end = start + tbl->it_size;
+
+ if ((start <= entry) && (entry < end)) {
+ ret = tbl;
+ break;
+ }
+ }
+
+ return ret;
+}
+
static int tce_iommu_enable(struct tce_container *container)
{
int ret = 0;
unsigned long locked;
- struct iommu_table *tbl = container->tbl;
+ struct iommu_table *tbl;
+ struct iommu_table_group *table_group;

- if (!container->tbl)
+ if (!container->grp)
return -ENXIO;

if (!current->mm)
@@ -143,6 +171,11 @@ static int tce_iommu_enable(struct tce_container *container)
* as this information is only available from KVM and VFIO is
* KVM agnostic.
*/
+ table_group = iommu_group_get_iommudata(container->grp);
+ if (!table_group)
+ return -ENODEV;
+
+ tbl = &table_group->tables[0];
locked = (tbl->it_size << tbl->it_page_shift) >> PAGE_SHIFT;
ret = try_increment_locked_vm(locked);
if (ret)
@@ -193,15 +226,17 @@ static int tce_iommu_clear(struct tce_container *container,
static void tce_iommu_release(void *iommu_data)
{
struct tce_container *container = iommu_data;
- struct iommu_table *tbl = container->tbl;
+ struct iommu_table *tbl;
+ struct iommu_table_group *table_group;

- WARN_ON(tbl && !tbl->it_group);
+ WARN_ON(container->grp);

- if (tbl) {
+ if (container->grp) {
+ table_group = iommu_group_get_iommudata(container->grp);
+ tbl = &table_group->tables[0];
tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size);

- if (tbl->it_group)
- tce_iommu_detach_group(iommu_data, tbl->it_group);
+ tce_iommu_detach_group(iommu_data, container->grp);
}

tce_iommu_disable(container);
@@ -329,9 +364,16 @@ static long tce_iommu_ioctl(void *iommu_data,

case VFIO_IOMMU_SPAPR_TCE_GET_INFO: {
struct vfio_iommu_spapr_tce_info info;
- struct iommu_table *tbl = container->tbl;
+ struct iommu_table *tbl;
+ struct iommu_table_group *table_group;

- if (WARN_ON(!tbl))
+ if (WARN_ON(!container->grp))
+ return -ENXIO;
+
+ table_group = iommu_group_get_iommudata(container->grp);
+
+ tbl = &table_group->tables[0];
+ if (WARN_ON_ONCE(!tbl))
return -ENXIO;

minsz = offsetofend(struct vfio_iommu_spapr_tce_info,
@@ -354,17 +396,12 @@ static long tce_iommu_ioctl(void *iommu_data,
}
case VFIO_IOMMU_MAP_DMA: {
struct vfio_iommu_type1_dma_map param;
- struct iommu_table *tbl = container->tbl;
+ struct iommu_table *tbl;
unsigned long tce;

if (!container->enabled)
return -EPERM;

- if (!tbl)
- return -ENXIO;
-
- BUG_ON(!tbl->it_group);
-
minsz = offsetofend(struct vfio_iommu_type1_dma_map, size);

if (copy_from_user(&param, (void __user *)arg, minsz))
@@ -377,6 +414,10 @@ static long tce_iommu_ioctl(void *iommu_data,
VFIO_DMA_MAP_FLAG_WRITE))
return -EINVAL;

+ tbl = spapr_tce_find_table(container, param.iova);
+ if (!tbl)
+ return -ENXIO;
+
if ((param.size & ~IOMMU_PAGE_MASK(tbl)) ||
(param.vaddr & ~IOMMU_PAGE_MASK(tbl)))
return -EINVAL;
@@ -402,14 +443,11 @@ static long tce_iommu_ioctl(void *iommu_data,
}
case VFIO_IOMMU_UNMAP_DMA: {
struct vfio_iommu_type1_dma_unmap param;
- struct iommu_table *tbl = container->tbl;
+ struct iommu_table *tbl;

if (!container->enabled)
return -EPERM;

- if (WARN_ON(!tbl))
- return -ENXIO;
-
minsz = offsetofend(struct vfio_iommu_type1_dma_unmap,
size);

@@ -423,6 +461,10 @@ static long tce_iommu_ioctl(void *iommu_data,
if (param.flags)
return -EINVAL;

+ tbl = spapr_tce_find_table(container, param.iova);
+ if (!tbl)
+ return -ENXIO;
+
if (param.size & ~IOMMU_PAGE_MASK(tbl))
return -EINVAL;

@@ -451,10 +493,10 @@ static long tce_iommu_ioctl(void *iommu_data,
mutex_unlock(&container->lock);
return 0;
case VFIO_EEH_PE_OP:
- if (!container->tbl || !container->tbl->it_group)
+ if (!container->grp)
return -ENODEV;

- return vfio_spapr_iommu_eeh_ioctl(container->tbl->it_group,
+ return vfio_spapr_iommu_eeh_ioctl(container->grp,
cmd, arg);
}

@@ -466,16 +508,15 @@ static int tce_iommu_attach_group(void *iommu_data,
{
int ret;
struct tce_container *container = iommu_data;
- struct iommu_table *tbl = iommu_group_get_iommudata(iommu_group);
+ struct iommu_table_group *table_group;

- BUG_ON(!tbl);
mutex_lock(&container->lock);

/* pr_debug("tce_vfio: Attaching group #%u to iommu %p\n",
iommu_group_id(iommu_group), iommu_group); */
- if (container->tbl) {
+ if (container->grp) {
pr_warn("tce_vfio: Only one group per IOMMU container is allowed, existing id=%d, attaching id=%d\n",
- iommu_group_id(container->tbl->it_group),
+ iommu_group_id(container->grp),
iommu_group_id(iommu_group));
ret = -EBUSY;
goto unlock_exit;
@@ -488,9 +529,15 @@ static int tce_iommu_attach_group(void *iommu_data,
goto unlock_exit;
}

- ret = iommu_take_ownership(tbl);
+ table_group = iommu_group_get_iommudata(iommu_group);
+ if (!table_group) {
+ ret = -ENXIO;
+ goto unlock_exit;
+ }
+
+ ret = iommu_take_ownership(&table_group->tables[0]);
if (!ret)
- container->tbl = tbl;
+ container->grp = iommu_group;

unlock_exit:
mutex_unlock(&container->lock);
@@ -502,27 +549,30 @@ static void tce_iommu_detach_group(void *iommu_data,
struct iommu_group *iommu_group)
{
struct tce_container *container = iommu_data;
- struct iommu_table *tbl = iommu_group_get_iommudata(iommu_group);
+ struct iommu_table_group *table_group;

- BUG_ON(!tbl);
mutex_lock(&container->lock);
- if (tbl != container->tbl) {
+ if (iommu_group != container->grp) {
pr_warn("tce_vfio: detaching group #%u, expected group is #%u\n",
iommu_group_id(iommu_group),
- iommu_group_id(tbl->it_group));
+ iommu_group_id(container->grp));
goto unlock_exit;
}

if (container->enabled) {
pr_warn("tce_vfio: detaching group #%u from enabled container, forcing disable\n",
- iommu_group_id(tbl->it_group));
+ iommu_group_id(container->grp));
tce_iommu_disable(container);
}

/* pr_debug("tce_vfio: detaching group #%u from iommu %p\n",
iommu_group_id(iommu_group), iommu_group); */
- container->tbl = NULL;
- iommu_release_ownership(tbl);
+ container->grp = NULL;
+
+ table_group = iommu_group_get_iommudata(iommu_group);
+ BUG_ON(!table_group);
+
+ iommu_release_ownership(&table_group->tables[0]);

unlock_exit:
mutex_unlock(&container->lock);
--
2.0.0

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