diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/drm/drm_pagemap.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/include/drm/drm_pagemap.h b/include/drm/drm_pagemap.h index dabc9c365df4..e5f20a1235be 100644 --- a/include/drm/drm_pagemap.h +++ b/include/drm/drm_pagemap.h @@ -92,6 +92,35 @@ struct drm_pagemap_ops { struct device *dev, struct drm_pagemap_device_addr addr); + /** + * @populate_mm: Populate part of the mm with @dpagemap memory, + * migrating existing data. + * @dpagemap: The struct drm_pagemap managing the memory. + * @start: The virtual start address in @mm + * @end: The virtual end address in @mm + * @mm: Pointer to a live mm. The caller must have an mmget() + * reference. + * + * The caller will have the mm lock at least in read mode. + * Note that there is no guarantee that the memory is resident + * after the function returns, it's best effort only. + * When the mm is not using the memory anymore, + * it will be released. The struct drm_pagemap might have a + * mechanism in place to reclaim the memory and the data will + * then be migrated. Typically to system memory. + * The implementation should hold sufficient runtime power- + * references while pages are used in an address space and + * should ideally guard against hardware device unbind in + * a way such that device pages are migrated back to system + * followed by device page removal. The implementation should + * return -ENODEV after device removal. + * + * Return: 0 if successful. Negative error code on error. + */ + int (*populate_mm)(struct drm_pagemap *dpagemap, + unsigned long start, unsigned long end, + struct mm_struct *mm, + unsigned long timeslice_ms); }; /** @@ -205,4 +234,9 @@ void drm_pagemap_devmem_init(struct drm_pagemap_devmem *devmem_allocation, const struct drm_pagemap_devmem_ops *ops, struct drm_pagemap *dpagemap, size_t size); +int drm_pagemap_populate_mm(struct drm_pagemap *dpagemap, + unsigned long start, unsigned long end, + struct mm_struct *mm, + unsigned long timeslice_ms); + #endif |