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mm: simplify ZONE_DEVICE page private data 

Remove the clumsy hmm_devmem_page_{get,set}_drvdata helpers, and
instead just access the page directly.  Also make the page data
a void pointer, and thus much easier to use.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Christoph Hellwig 2019-06-26 14:27:21 +02:00 committed by Jason Gunthorpe
parent eee3ae41b1
commit 8a164fef9c
4 changed files with 12 additions and 48 deletions
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18
drivers/gpu/drm/nouveau/nouveau_dmem.c
View File

@ -104,11 +104,8 @@ struct nouveau_migrate {
static void nouveau_dmem_page_free(struct page *page)
{
struct nouveau_dmem_chunk *chunk;
unsigned long idx;
chunk = (void *)hmm_devmem_page_get_drvdata(page);
idx = page_to_pfn(page) - chunk->pfn_first;
struct nouveau_dmem_chunk *chunk = page->zone_device_data;
unsigned long idx = page_to_pfn(page) - chunk->pfn_first;
/*
* FIXME:
@ -200,7 +197,7 @@ nouveau_dmem_fault_alloc_and_copy(struct vm_area_struct *vma,
dst_addr = fault->dma[fault->npages++];
chunk = (void *)hmm_devmem_page_get_drvdata(spage);
chunk = spage->zone_device_data;
src_addr = page_to_pfn(spage) - chunk->pfn_first;
src_addr = (src_addr << PAGE_SHIFT) + chunk->bo->bo.offset;
@ -633,9 +630,8 @@ nouveau_dmem_init(struct nouveau_drm *drm)
list_add_tail(&chunk->list, &drm->dmem->chunk_empty);
page = pfn_to_page(chunk->pfn_first);
for (j = 0; j < DMEM_CHUNK_NPAGES; ++j, ++page) {
hmm_devmem_page_set_drvdata(page, (long)chunk);
}
for (j = 0; j < DMEM_CHUNK_NPAGES; ++j, ++page)
page->zone_device_data = chunk;
}
NV_INFO(drm, "DMEM: registered %ldMB of device memory\n", size >> 20);
@ -698,7 +694,7 @@ nouveau_dmem_migrate_alloc_and_copy(struct vm_area_struct *vma,
if (!dpage || dst_pfns[i] == MIGRATE_PFN_ERROR)
continue;
chunk = (void *)hmm_devmem_page_get_drvdata(dpage);
chunk = dpage->zone_device_data;
dst_addr = page_to_pfn(dpage) - chunk->pfn_first;
dst_addr = (dst_addr << PAGE_SHIFT) + chunk->bo->bo.offset;
@ -862,7 +858,7 @@ nouveau_dmem_convert_pfn(struct nouveau_drm *drm,
continue;
}
chunk = (void *)hmm_devmem_page_get_drvdata(page);
chunk = page->zone_device_data;
addr = page_to_pfn(page) - chunk->pfn_first;
addr = (addr + chunk->bo->bo.mem.start) << PAGE_SHIFT;

32
include/linux/hmm.h
View File

@ -584,36 +584,4 @@ static inline void hmm_mm_destroy(struct mm_struct *mm) {}
static inline void hmm_mm_init(struct mm_struct *mm) {}
#endif /* IS_ENABLED(CONFIG_HMM_MIRROR) */
#if IS_ENABLED(CONFIG_DEVICE_PRIVATE)
/*
* hmm_devmem_page_set_drvdata - set per-page driver data field
*
* @page: pointer to struct page
* @data: driver data value to set
*
* Because page can not be on lru we have an unsigned long that driver can use
* to store a per page field. This just a simple helper to do that.
*/
static inline void hmm_devmem_page_set_drvdata(struct page *page,
unsigned long data)
{
page->hmm_data = data;
}
/*
* hmm_devmem_page_get_drvdata - get per page driver data field
*
* @page: pointer to struct page
* Return: driver data value
*/
static inline unsigned long hmm_devmem_page_get_drvdata(const struct page *page)
{
return page->hmm_data;
}
#endif /* CONFIG_DEVICE_PRIVATE */
#else /* IS_ENABLED(CONFIG_HMM) */
static inline void hmm_mm_destroy(struct mm_struct *mm) {}
static inline void hmm_mm_init(struct mm_struct *mm) {}
#endif /* IS_ENABLED(CONFIG_HMM) */
#endif /* LINUX_HMM_H */

2
include/linux/mm_types.h
View File

@ -158,7 +158,7 @@ struct page {
struct { /* ZONE_DEVICE pages */
/** @pgmap: Points to the hosting device page map. */
struct dev_pagemap *pgmap;
unsigned long hmm_data;
void *zone_device_data;
unsigned long _zd_pad_1; /* uses mapping */
};

8
mm/page_alloc.c
View File

@ -5886,12 +5886,12 @@ void __ref memmap_init_zone_device(struct zone *zone,
__SetPageReserved(page);
/*
* ZONE_DEVICE pages union ->lru with a ->pgmap back
* pointer and hmm_data. It is a bug if a ZONE_DEVICE
* page is ever freed or placed on a driver-private list.
* ZONE_DEVICE pages union ->lru with a ->pgmap back pointer
* and zone_device_data. It is a bug if a ZONE_DEVICE page is
* ever freed or placed on a driver-private list.
*/
page->pgmap = pgmap;
page->hmm_data = 0;
page->zone_device_data = NULL;
/*
* Mark the block movable so that blocks are reserved for