diff options
| author | Jason Gunthorpe <jgg@nvidia.com> | 2025-04-08 13:53:56 -0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2025-04-17 16:22:40 +0200 |
| commit | 13f43d7cf3e0570004a0d960bc1be23db827c2ff (patch) | |
| tree | f363566d8bd10eb941836f8a9fb4c0ea96663248 /include/linux/iommu.h | |
| parent | f5af4a4f7ccb58c0022175b3457c840a77463e7a (diff) | |
iommu/pages: Formalize the freelist API
We want to get rid of struct page references outside the internal
allocator implementation. The free list has the driver open code something
like:
list_add_tail(&virt_to_page(ptr)->lru, freelist);
Move the above into a small inline and make the freelist into a wrapper
type 'struct iommu_pages_list' so that the compiler can help check all the
conversion.
This struct has also proven helpful in some future ideas to convert to a
singly linked list to get an extra pointer in the struct page, and to
signal that the pages should be freed with RCU.
Use a temporary _Generic so we don't need to rename the free function as
the patches progress.
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/8-v4-c8663abbb606+3f7-iommu_pages_jgg@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'include/linux/iommu.h')
| -rw-r--r-- | include/linux/iommu.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h index ccce8a751e2a..6dd3a221c5bc 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -341,6 +341,18 @@ typedef unsigned int ioasid_t; /* Read but do not clear any dirty bits */ #define IOMMU_DIRTY_NO_CLEAR (1 << 0) +/* + * Pages allocated through iommu_alloc_pages_node() can be placed on this list + * using iommu_pages_list_add(). Note: ONLY pages from iommu_alloc_pages_node() + * can be used this way! + */ +struct iommu_pages_list { + struct list_head pages; +}; + +#define IOMMU_PAGES_LIST_INIT(name) \ + ((struct iommu_pages_list){ .pages = LIST_HEAD_INIT(name.pages) }) + #ifdef CONFIG_IOMMU_API /** |