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Message-Id: <20190617122733.22432-23-hch@lst.de>
Date: Mon, 17 Jun 2019 14:27:30 +0200
From: Christoph Hellwig <hch@....de>
To: Dan Williams <dan.j.williams@...el.com>,
Jérôme Glisse <jglisse@...hat.com>,
Jason Gunthorpe <jgg@...lanox.com>,
Ben Skeggs <bskeggs@...hat.com>
Cc: linux-mm@...ck.org, nouveau@...ts.freedesktop.org,
dri-devel@...ts.freedesktop.org, linux-nvdimm@...ts.01.org,
linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 22/25] 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@....de>
---
drivers/gpu/drm/nouveau/nouveau_dmem.c | 18 +++++++----------
include/linux/hmm.h | 27 --------------------------
include/linux/mm_types.h | 2 +-
mm/page_alloc.c | 8 ++++----
4 files changed, 12 insertions(+), 43 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/nouveau_dmem.c b/drivers/gpu/drm/nouveau/nouveau_dmem.c
index 0fb7a44b8bc4..42c026010938 100644
--- a/drivers/gpu/drm/nouveau/nouveau_dmem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_dmem.c
@@ -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;
diff --git a/include/linux/hmm.h b/include/linux/hmm.h
index 50ef29958604..454be41f2eaf 100644
--- a/include/linux/hmm.h
+++ b/include/linux/hmm.h
@@ -586,33 +586,6 @@ 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) || IS_ENABLED(CONFIG_DEVICE_PUBLIC)
-/*
- * 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 || CONFIG_DEVICE_PUBLIC */
#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) {}
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 8ec38b11b361..f33a1289c101 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -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 */
};
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 17a39d40a556..c0e031c52db5 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -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
--
2.20.1
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