On Wed, Jun 25, 2014 at 02:12:34PM +1000, Alexey Kardashevskiy wrote: >On 06/25/2014 11:12 AM, Wei Yang wrote: >> On Tue, Jun 24, 2014 at 08:06:32PM +1000, Alexey Kardashevskiy wrote: >>> On 06/10/2014 11:56 AM, Wei Yang wrote: >>>> Current iommu_table of a PE is a static field. This will have a problem when >>>> iommu_free_table is called. >>> >>> What kind of problem? This table is per PE and PE is not going anywhere. >>> >> >> Yes, for Bus PE, they will always sit in the system. When VF PE introduced, >> they could be released on the fly. When they are released, so do the iommu >> table for the PE. > >iommu_table is a part of PE struct. When PE is released, iommu_table will >go with it as well. Why to make is a pointer? I would understand it if you >added reference counting there but no - iommu_table's lifetime is equal to >PE lifetime. > Yes, iommu_talbe's life time equals to PE lifetime, so when releasing a PE we need to release the iommu table. Currently, there is one function to release the iommu table, iommu_free_table() which takes a pointer of the iommu_table and release it. If the iommu table in PE is just a part of PE, it will have some problem to release it with iommu_free_table(). That's why I make it a pointer in PE structure. > > >-- >Alexey -- Richard Yang Help you, Help me -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
