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drm/pagemap: Add helper to access backing devmem allocation

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drm_pagemap_zdd is private, so add drm_pagemap_page_to_devmem() to let
callers get the drm_pagemap_devmem backing a device-private/coherent
page. Add a NULL stub for !CONFIG_ZONE_DEVICE.

Cc: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patch.msgid.link/20261001033602.3166274-7-himal.prasad.ghimiray@intel.com
Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Himal Prasad Ghimiray 2026-10-01 09:06:04 +05:30 committed by Rodrigo Vivi
parent 123c1f0430
commit 2069eeb76a
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GPG Key ID: FA625F640EEB13CA
2 changed files with 22 additions and 0 deletions
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15
drivers/gpu/drm/drm_pagemap.c
View File

@ -1433,6 +1433,21 @@ struct drm_pagemap *drm_pagemap_page_to_dpagemap(struct page *page)
}
EXPORT_SYMBOL_GPL(drm_pagemap_page_to_dpagemap);
/**
* drm_pagemap_page_to_devmem() - Return the devmem allocation backing a page
* @page: The struct page.
*
* Return: The &drm_pagemap_devmem backing @page. Undefined if @page was not
* populated from a &drm_pagemap.
*/
struct drm_pagemap_devmem *drm_pagemap_page_to_devmem(struct page *page)
{
struct drm_pagemap_zdd *zdd = drm_pagemap_page_zone_device_data(page);
return zdd->devmem_allocation;
}
EXPORT_SYMBOL_GPL(drm_pagemap_page_to_devmem);
/**
* drm_pagemap_populate_mm() - Populate a virtual range with device memory pages
* @dpagemap: Pointer to the drm_pagemap managing the device memory

7
include/drm/drm_pagemap.h
View File

@ -257,6 +257,8 @@ struct drm_pagemap *drm_pagemap_create(struct drm_device *drm,
struct drm_pagemap *drm_pagemap_page_to_dpagemap(struct page *page);
struct drm_pagemap_devmem *drm_pagemap_page_to_devmem(struct page *page);
void drm_pagemap_put(struct drm_pagemap *dpagemap);
#else
@ -266,6 +268,11 @@ static inline struct drm_pagemap *drm_pagemap_page_to_dpagemap(struct page *page
return NULL;
}
static inline struct drm_pagemap_devmem *drm_pagemap_page_to_devmem(struct page *page)
{
return NULL;
}
static inline void drm_pagemap_put(struct drm_pagemap *dpagemap)
{
}