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Commit e7ebb936 authored by Liam Mark's avatar Liam Mark Committed by Patrick Daly
Browse files

iommu/io-pgtable-fast: alloc pgtable while fragmented 



The size of the array which holds the page tables can be on the
order of several pages.
In a fragmented system it may not be possible to allocate the
memory as contiguous.

Handle fragmentation by falling back to vmalloc.

Change-Id: Icc29849bd1c8c589da24e2a73988e3247f7bcb64
Signed-off-by: default avatarLiam Mark <lmark@codeaurora.org>
Signed-off-by: default avatarPatrick Daly <pdaly@codeaurora.org>
parent aeff2c19

drivers/iommu/io-pgtable-fast.c

+9 −4
Original line number Diff line number Diff line 
/* Copyright (c) 2016, The Linux Foundation. All rights reserved.

/* Copyright (c) 2016-2017, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and
@@ -345,7 +345,12 @@ av8l_fast_prepopulate_pgtables(struct av8l_fast_io_pgtable *data, 
	int i, j, pg = 0;

	struct page **pages, *page;



	pages = kmalloc(sizeof(*pages) * NUM_PGTBL_PAGES, GFP_KERNEL);

	pages = kmalloc(sizeof(*pages) * NUM_PGTBL_PAGES, __GFP_NOWARN |

							__GFP_NORETRY);



	if (!pages)

		pages = vmalloc(sizeof(*pages) * NUM_PGTBL_PAGES);



	if (!pages)

		return -ENOMEM;
@@ -414,7 +419,7 @@ av8l_fast_prepopulate_pgtables(struct av8l_fast_io_pgtable *data, 
	for (i = 0; i < pg; ++i)

		__free_page(pages[i]);

err_free_pages_arr:

	kfree(pages);

	kvfree(pages);

	return -ENOMEM;

}
@@ -512,7 +517,7 @@ static void av8l_fast_free_pgtable(struct io_pgtable *iop) 
	vunmap(data->pmds);

	for (i = 0; i < NUM_PGTBL_PAGES; ++i)

		__free_page(data->pages[i]);

	kfree(data->pages);

	kvfree(data->pages);

	kfree(data);

}