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Commit e7744aa2 authored by Logan Gunthorpe's avatar Logan Gunthorpe Committed by Dan Williams
Browse files

memremap: drop private struct page_map 



'struct page_map' is a private structure of 'struct dev_pagemap' but the
latter replicates all the same fields as the former so there isn't much
value in it. Thus drop it in favour of a completely public struct.

This is a clean up in preperation for a more generally useful
'devm_memeremap_pages' interface.

Signed-off-by: default avatarLogan Gunthorpe <logang@deltatee.com>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent 7003e3b1

include/linux/memremap.h

+3 −2
Original line number Diff line number Diff line
@@ -113,8 +113,9 @@ typedef void (*dev_page_free_t)(struct page *page, void *data); 
struct dev_pagemap {

	dev_page_fault_t page_fault;

	dev_page_free_t page_free;

	struct vmem_altmap *altmap;

	const struct resource *res;

	struct vmem_altmap altmap;

	bool altmap_valid;

	struct resource res;

	struct percpu_ref *ref;

	struct device *dev;

	void *data;

kernel/memremap.c

+26 −42
Original line number Diff line number Diff line
@@ -188,13 +188,6 @@ static RADIX_TREE(pgmap_radix, GFP_KERNEL); 
#define SECTION_MASK ~((1UL << PA_SECTION_SHIFT) - 1)

#define SECTION_SIZE (1UL << PA_SECTION_SHIFT)



struct page_map {

	struct resource res;

	struct percpu_ref *ref;

	struct dev_pagemap pgmap;

	struct vmem_altmap altmap;

};



static unsigned long order_at(struct resource *res, unsigned long pgoff)

{

	unsigned long phys_pgoff = PHYS_PFN(res->start) + pgoff;
@@ -260,22 +253,21 @@ static void pgmap_radix_release(struct resource *res) 
	synchronize_rcu();

}



static unsigned long pfn_first(struct page_map *page_map)

static unsigned long pfn_first(struct dev_pagemap *pgmap)

{

	struct dev_pagemap *pgmap = &page_map->pgmap;

	const struct resource *res = &page_map->res;

	struct vmem_altmap *altmap = pgmap->altmap;

	const struct resource *res = &pgmap->res;

	struct vmem_altmap *altmap = &pgmap->altmap;

	unsigned long pfn;



	pfn = res->start >> PAGE_SHIFT;

	if (altmap)

	if (pgmap->altmap_valid)

		pfn += vmem_altmap_offset(altmap);

	return pfn;

}



static unsigned long pfn_end(struct page_map *page_map)

static unsigned long pfn_end(struct dev_pagemap *pgmap)

{

	const struct resource *res = &page_map->res;

	const struct resource *res = &pgmap->res;



	return (res->start + resource_size(res)) >> PAGE_SHIFT;

}
@@ -285,13 +277,12 @@ static unsigned long pfn_end(struct page_map *page_map) 


static void devm_memremap_pages_release(struct device *dev, void *data)

{

	struct page_map *page_map = data;

	struct resource *res = &page_map->res;

	struct dev_pagemap *pgmap = data;

	struct resource *res = &pgmap->res;

	resource_size_t align_start, align_size;

	struct dev_pagemap *pgmap = &page_map->pgmap;

	unsigned long pfn;



	for_each_device_pfn(pfn, page_map)

	for_each_device_pfn(pfn, pgmap)

		put_page(pfn_to_page(pfn));



	if (percpu_ref_tryget_live(pgmap->ref)) {
@@ -304,24 +295,22 @@ static void devm_memremap_pages_release(struct device *dev, void *data) 
	align_size = ALIGN(resource_size(res), SECTION_SIZE);



	mem_hotplug_begin();

	arch_remove_memory(align_start, align_size, pgmap->altmap);

	arch_remove_memory(align_start, align_size, pgmap->altmap_valid ?

			&pgmap->altmap : NULL);

	mem_hotplug_done();



	untrack_pfn(NULL, PHYS_PFN(align_start), align_size);

	pgmap_radix_release(res);

	dev_WARN_ONCE(dev, pgmap->altmap && pgmap->altmap->alloc,

	dev_WARN_ONCE(dev, pgmap->altmap.alloc,

		      "%s: failed to free all reserved pages\n", __func__);

}



/* assumes rcu_read_lock() held at entry */

static struct dev_pagemap *find_dev_pagemap(resource_size_t phys)

{

	struct page_map *page_map;



	WARN_ON_ONCE(!rcu_read_lock_held());



	page_map = radix_tree_lookup(&pgmap_radix, PHYS_PFN(phys));

	return page_map ? &page_map->pgmap : NULL;

	return radix_tree_lookup(&pgmap_radix, PHYS_PFN(phys));

}



/**
@@ -349,7 +338,6 @@ void *devm_memremap_pages(struct device *dev, struct resource *res, 
	unsigned long pfn, pgoff, order;

	pgprot_t pgprot = PAGE_KERNEL;

	struct dev_pagemap *pgmap;

	struct page_map *page_map;

	int error, nid, is_ram, i = 0;



	align_start = res->start & ~(SECTION_SIZE - 1);
@@ -370,22 +358,20 @@ void *devm_memremap_pages(struct device *dev, struct resource *res, 
	if (!ref)

		return ERR_PTR(-EINVAL);



	page_map = devres_alloc_node(devm_memremap_pages_release,

			sizeof(*page_map), GFP_KERNEL, dev_to_node(dev));

	if (!page_map)

	pgmap = devres_alloc_node(devm_memremap_pages_release,

			sizeof(*pgmap), GFP_KERNEL, dev_to_node(dev));

	if (!pgmap)

		return ERR_PTR(-ENOMEM);

	pgmap = &page_map->pgmap;



	memcpy(&page_map->res, res, sizeof(*res));

	memcpy(&pgmap->res, res, sizeof(*res));



	pgmap->dev = dev;

	if (altmap) {

		memcpy(&page_map->altmap, altmap, sizeof(*altmap));

		pgmap->altmap = &page_map->altmap;

		altmap = pgmap->altmap;

		memcpy(&pgmap->altmap, altmap, sizeof(*altmap));

		pgmap->altmap_valid = true;

		altmap = &pgmap->altmap;

	}

	pgmap->ref = ref;

	pgmap->res = &page_map->res;

	pgmap->type = MEMORY_DEVICE_HOST;

	pgmap->page_fault = NULL;

	pgmap->page_free = NULL;
@@ -397,7 +383,7 @@ void *devm_memremap_pages(struct device *dev, struct resource *res, 


	foreach_order_pgoff(res, order, pgoff) {

		error = __radix_tree_insert(&pgmap_radix,

				PHYS_PFN(res->start) + pgoff, order, page_map);

				PHYS_PFN(res->start) + pgoff, order, pgmap);

		if (error) {

			dev_err(dev, "%s: failed: %d\n", __func__, error);

			break;
@@ -426,7 +412,7 @@ void *devm_memremap_pages(struct device *dev, struct resource *res, 
	if (error)

		goto err_add_memory;



	for_each_device_pfn(pfn, page_map) {

	for_each_device_pfn(pfn, pgmap) {

		struct page *page = pfn_to_page(pfn);



		/*
@@ -441,7 +427,7 @@ void *devm_memremap_pages(struct device *dev, struct resource *res, 
		if (!(++i % 1024))

			cond_resched();

	}

	devres_add(dev, page_map);

	devres_add(dev, pgmap);

	return __va(res->start);



 err_add_memory:
@@ -449,7 +435,7 @@ void *devm_memremap_pages(struct device *dev, struct resource *res, 
 err_pfn_remap:

 err_radix:

	pgmap_radix_release(res);

	devres_free(page_map);

	devres_free(pgmap);

	return ERR_PTR(error);

}

EXPORT_SYMBOL(devm_memremap_pages);
@@ -482,9 +468,7 @@ struct dev_pagemap *get_dev_pagemap(unsigned long pfn, 
	 * In the cached case we're already holding a live reference.

	 */

	if (pgmap) {

		const struct resource *res = pgmap ? pgmap->res : NULL;



		if (res && phys >= res->start && phys <= res->end)

		if (phys >= pgmap->res.start && phys <= pgmap->res.end)

			return pgmap;

		put_dev_pagemap(pgmap);

	}

mm/hmm.c

+1 −1
Original line number Diff line number Diff line
@@ -882,7 +882,7 @@ static int hmm_devmem_pages_create(struct hmm_devmem *devmem) 
	else

		devmem->pagemap.type = MEMORY_DEVICE_PRIVATE;



	devmem->pagemap.res = devmem->resource;

	devmem->pagemap.res = *devmem->resource;

	devmem->pagemap.page_fault = hmm_devmem_fault;

	devmem->pagemap.page_free = hmm_devmem_free;

	devmem->pagemap.dev = devmem->device;