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Message-Id: <20190617122733.22432-19-hch@lst.de>
Date: Mon, 17 Jun 2019 14:27:26 +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 18/25] nouveau: use devm_memremap_pages directly
Just use devm_memremap_pages instead of hmm_devmem_add pages to allow
killing that wrapper which doesn't provide a whole lot of benefits.
Signed-off-by: Christoph Hellwig <hch@....de>
---
drivers/gpu/drm/nouveau/nouveau_dmem.c | 82 ++++++++++++--------------
1 file changed, 38 insertions(+), 44 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/nouveau_dmem.c b/drivers/gpu/drm/nouveau/nouveau_dmem.c
index a50f6fd2fe24..0fb7a44b8bc4 100644
--- a/drivers/gpu/drm/nouveau/nouveau_dmem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_dmem.c
@@ -72,7 +72,8 @@ struct nouveau_dmem_migrate {
};
struct nouveau_dmem {
- struct hmm_devmem *devmem;
+ struct nouveau_drm *drm;
+ struct dev_pagemap pagemap;
struct nouveau_dmem_migrate migrate;
struct list_head chunk_free;
struct list_head chunk_full;
@@ -80,6 +81,11 @@ struct nouveau_dmem {
struct mutex mutex;
};
+static inline struct nouveau_dmem *page_to_dmem(struct page *page)
+{
+ return container_of(page->pgmap, struct nouveau_dmem, pagemap);
+}
+
struct nouveau_dmem_fault {
struct nouveau_drm *drm;
struct nouveau_fence *fence;
@@ -96,8 +102,7 @@ struct nouveau_migrate {
unsigned long dma_nr;
};
-static void
-nouveau_dmem_free(struct hmm_devmem *devmem, struct page *page)
+static void nouveau_dmem_page_free(struct page *page)
{
struct nouveau_dmem_chunk *chunk;
unsigned long idx;
@@ -260,29 +265,21 @@ static const struct migrate_vma_ops nouveau_dmem_fault_migrate_ops = {
.finalize_and_map = nouveau_dmem_fault_finalize_and_map,
};
-static vm_fault_t
-nouveau_dmem_fault(struct hmm_devmem *devmem,
- struct vm_area_struct *vma,
- unsigned long addr,
- const struct page *page,
- unsigned int flags,
- pmd_t *pmdp)
+static vm_fault_t nouveau_dmem_migrate_to_ram(struct vm_fault *vmf)
{
- struct drm_device *drm_dev = dev_get_drvdata(devmem->device);
+ struct nouveau_dmem *dmem = page_to_dmem(vmf->page);
unsigned long src[1] = {0}, dst[1] = {0};
- struct nouveau_dmem_fault fault = {0};
+ struct nouveau_dmem_fault fault = { .drm = dmem->drm };
int ret;
-
-
/*
* FIXME what we really want is to find some heuristic to migrate more
* than just one page on CPU fault. When such fault happens it is very
* likely that more surrounding page will CPU fault too.
*/
- fault.drm = nouveau_drm(drm_dev);
- ret = migrate_vma(&nouveau_dmem_fault_migrate_ops, vma, addr,
- addr + PAGE_SIZE, src, dst, &fault);
+ ret = migrate_vma(&nouveau_dmem_fault_migrate_ops, vmf->vma,
+ vmf->address, vmf->address + PAGE_SIZE,
+ src, dst, &fault);
if (ret)
return VM_FAULT_SIGBUS;
@@ -292,10 +289,9 @@ nouveau_dmem_fault(struct hmm_devmem *devmem,
return 0;
}
-static const struct hmm_devmem_ops
-nouveau_dmem_devmem_ops = {
- .free = nouveau_dmem_free,
- .fault = nouveau_dmem_fault,
+static const struct dev_pagemap_ops nouveau_dmem_pagemap_ops = {
+ .page_free = nouveau_dmem_page_free,
+ .migrate_to_ram = nouveau_dmem_migrate_to_ram,
};
static int
@@ -581,7 +577,8 @@ void
nouveau_dmem_init(struct nouveau_drm *drm)
{
struct device *device = drm->dev->dev;
- unsigned long i, size;
+ struct resource *res;
+ unsigned long i, size, pfn_first;
int ret;
/* This only make sense on PASCAL or newer */
@@ -591,6 +588,7 @@ nouveau_dmem_init(struct nouveau_drm *drm)
if (!(drm->dmem = kzalloc(sizeof(*drm->dmem), GFP_KERNEL)))
return;
+ drm->dmem->drm = drm;
mutex_init(&drm->dmem->mutex);
INIT_LIST_HEAD(&drm->dmem->chunk_free);
INIT_LIST_HEAD(&drm->dmem->chunk_full);
@@ -600,11 +598,8 @@ nouveau_dmem_init(struct nouveau_drm *drm)
/* Initialize migration dma helpers before registering memory */
ret = nouveau_dmem_migrate_init(drm);
- if (ret) {
- kfree(drm->dmem);
- drm->dmem = NULL;
- return;
- }
+ if (ret)
+ goto out_free;
/*
* FIXME we need some kind of policy to decide how much VRAM we
@@ -612,14 +607,16 @@ nouveau_dmem_init(struct nouveau_drm *drm)
* and latter if we want to do thing like over commit then we
* could revisit this.
*/
- drm->dmem->devmem = hmm_devmem_add(&nouveau_dmem_devmem_ops,
- device, size);
- if (IS_ERR(drm->dmem->devmem)) {
- kfree(drm->dmem);
- drm->dmem = NULL;
- return;
- }
-
+ res = devm_request_free_mem_region(device, &iomem_resource, size);
+ if (IS_ERR(res))
+ goto out_free;
+ drm->dmem->pagemap.type = MEMORY_DEVICE_PRIVATE;
+ drm->dmem->pagemap.res = *res;
+ drm->dmem->pagemap.ops = &nouveau_dmem_pagemap_ops;
+ if (IS_ERR(devm_memremap_pages(device, &drm->dmem->pagemap)))
+ goto out_free;
+
+ pfn_first = res->start >> PAGE_SHIFT;
for (i = 0; i < (size / DMEM_CHUNK_SIZE); ++i) {
struct nouveau_dmem_chunk *chunk;
struct page *page;
@@ -632,8 +629,7 @@ nouveau_dmem_init(struct nouveau_drm *drm)
}
chunk->drm = drm;
- chunk->pfn_first = drm->dmem->devmem->pfn_first;
- chunk->pfn_first += (i * DMEM_CHUNK_NPAGES);
+ chunk->pfn_first = pfn_first + (i * DMEM_CHUNK_NPAGES);
list_add_tail(&chunk->list, &drm->dmem->chunk_empty);
page = pfn_to_page(chunk->pfn_first);
@@ -643,6 +639,10 @@ nouveau_dmem_init(struct nouveau_drm *drm)
}
NV_INFO(drm, "DMEM: registered %ldMB of device memory\n", size >> 20);
+ return;
+out_free:
+ kfree(drm->dmem);
+ drm->dmem = NULL;
}
static void
@@ -833,13 +833,7 @@ nouveau_dmem_migrate_vma(struct nouveau_drm *drm,
static inline bool
nouveau_dmem_page(struct nouveau_drm *drm, struct page *page)
{
- if (!is_device_private_page(page))
- return false;
-
- if (drm->dmem->devmem != page->pgmap->data)
- return false;
-
- return true;
+ return is_device_private_page(page) && drm->dmem == page_to_dmem(page);
}
void
--
2.20.1
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