From eee3ae41b153e55e25d6cf7bd5b5098ba0afe705 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig
Date: Wed, 26 Jun 2019 14:27:20 +0200
Subject: mm: remove hmm_devmem_add

There isn't really much value add in the hmm_devmem_add wrapper and
more, as using devm_memremap_pages directly now is just as simple.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
---
 mm/hmm.c | 110 ---------------------------------------------------------------
 1 file changed, 110 deletions(-)

(limited to 'mm/hmm.c')

diff --git a/mm/hmm.c b/mm/hmm.c
index fdbd48771292..90ca0cdab9db 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -1327,113 +1327,3 @@ long hmm_range_dma_unmap(struct hmm_range *range,
 }
 EXPORT_SYMBOL(hmm_range_dma_unmap);
 #endif /* IS_ENABLED(CONFIG_HMM_MIRROR) */
-
-
-#if IS_ENABLED(CONFIG_DEVICE_PRIVATE)
-static void hmm_devmem_ref_release(struct percpu_ref *ref)
-{
-	struct hmm_devmem *devmem;
-
-	devmem = container_of(ref, struct hmm_devmem, ref);
-	complete(&devmem->completion);
-}
-
-static void hmm_devmem_ref_exit(struct dev_pagemap *pgmap)
-{
-	struct hmm_devmem *devmem;
-
-	devmem = container_of(pgmap, struct hmm_devmem, pagemap);
-	wait_for_completion(&devmem->completion);
-	percpu_ref_exit(pgmap->ref);
-}
-
-static void hmm_devmem_ref_kill(struct dev_pagemap *pgmap)
-{
-	percpu_ref_kill(pgmap->ref);
-}
-
-static vm_fault_t hmm_devmem_migrate_to_ram(struct vm_fault *vmf)
-{
-	struct hmm_devmem *devmem =
-		container_of(vmf->page->pgmap, struct hmm_devmem, pagemap);
-
-	return devmem->ops->fault(devmem, vmf->vma, vmf->address, vmf->page,
-			vmf->flags, vmf->pmd);
-}
-
-static void hmm_devmem_free(struct page *page)
-{
-	struct hmm_devmem *devmem =
-		container_of(page->pgmap, struct hmm_devmem, pagemap);
-
-	devmem->ops->free(devmem, page);
-}
-
-static const struct dev_pagemap_ops hmm_pagemap_ops = {
-	.page_free		= hmm_devmem_free,
-	.kill			= hmm_devmem_ref_kill,
-	.cleanup		= hmm_devmem_ref_exit,
-	.migrate_to_ram		= hmm_devmem_migrate_to_ram,
-};
-
-/*
- * hmm_devmem_add() - hotplug ZONE_DEVICE memory for device memory
- *
- * @ops: memory event device driver callback (see struct hmm_devmem_ops)
- * @device: device struct to bind the resource too
- * @size: size in bytes of the device memory to add
- * Returns: pointer to new hmm_devmem struct ERR_PTR otherwise
- *
- * This function first finds an empty range of physical address big enough to
- * contain the new resource, and then hotplugs it as ZONE_DEVICE memory, which
- * in turn allocates struct pages. It does not do anything beyond that; all
- * events affecting the memory will go through the various callbacks provided
- * by hmm_devmem_ops struct.
- *
- * Device driver should call this function during device initialization and
- * is then responsible of memory management. HMM only provides helpers.
- */
-struct hmm_devmem *hmm_devmem_add(const struct hmm_devmem_ops *ops,
-				  struct device *device,
-				  unsigned long size)
-{
-	struct hmm_devmem *devmem;
-	void *result;
-	int ret;
-
-	devmem = devm_kzalloc(device, sizeof(*devmem), GFP_KERNEL);
-	if (!devmem)
-		return ERR_PTR(-ENOMEM);
-
-	init_completion(&devmem->completion);
-	devmem->pfn_first = -1UL;
-	devmem->pfn_last = -1UL;
-	devmem->resource = NULL;
-	devmem->device = device;
-	devmem->ops = ops;
-
-	ret = percpu_ref_init(&devmem->ref, &hmm_devmem_ref_release,
-			      0, GFP_KERNEL);
-	if (ret)
-		return ERR_PTR(ret);
-
-	devmem->resource = devm_request_free_mem_region(device, &iomem_resource,
-			size);
-	if (IS_ERR(devmem->resource))
-		return ERR_CAST(devmem->resource);
-	devmem->pfn_first = devmem->resource->start >> PAGE_SHIFT;
-	devmem->pfn_last = devmem->pfn_first +
-			   (resource_size(devmem->resource) >> PAGE_SHIFT);
-
-	devmem->pagemap.type = MEMORY_DEVICE_PRIVATE;
-	devmem->pagemap.res = *devmem->resource;
-	devmem->pagemap.ops = &hmm_pagemap_ops;
-	devmem->pagemap.ref = &devmem->ref;
-
-	result = devm_memremap_pages(devmem->device, &devmem->pagemap);
-	if (IS_ERR(result))
-		return result;
-	return devmem;
-}
-EXPORT_SYMBOL_GPL(hmm_devmem_add);
-#endif /* CONFIG_DEVICE_PRIVATE  */
-- 
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