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SubjectRe: [PATCH kernel v8 12/31] powerpc/spapr: vfio: Switch from iommu_table to new iommu_table_group
On 04/16/2015 03:55 PM, David Gibson wrote:
> On Fri, Apr 10, 2015 at 04:30:54PM +1000, Alexey Kardashevskiy wrote:
>> 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@ozlabs.ru>
>> ---
>> 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 ++++++++++++++++++++--------
>> 8 files changed, 160 insertions(+), 82 deletions(-)
>>
>> 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];
>
> There's nothing to indicate which of the tables are in use at the
> current time. I mean, it doesn't matter now because there's only one,
> but the patch doesn't make a whole lot of sense without that.


Later in the patchset, the code will look at @it_size to know if the table
is in use.


>
>> +};
>> +
>> +#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)
>
> Surely the free function should take a table group rather than a table
> as argument.


Please ignore my other response to your reply; I reworked the whole thing
to store iommu_table_group in the pci device node. Thanks.


--
Alexey


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