#ifndef _ASM_ARM_XEN_PAGE_COHERENT_H
#define _ASM_ARM_XEN_PAGE_COHERENT_H

#include <asm/page.h>
#include <linux/dma-mapping.h>

void __xen_dma_map_page(struct device *hwdev, struct page *page,
	     dma_addr_t dev_addr, unsigned long offset, size_t size,
	     enum dma_data_direction dir, unsigned long attrs);
void __xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
		size_t size, enum dma_data_direction dir,
		unsigned long attrs);
void __xen_dma_sync_single_for_cpu(struct device *hwdev,
		dma_addr_t handle, size_t size, enum dma_data_direction dir);

void __xen_dma_sync_single_for_device(struct device *hwdev,
		dma_addr_t handle, size_t size, enum dma_data_direction dir);

static inline void *xen_alloc_coherent_pages(struct device *hwdev, size_t size,
		dma_addr_t *dma_handle, gfp_t flags, unsigned long attrs)
{
	return __generic_dma_ops(hwdev)->alloc(hwdev, size, dma_handle, flags, attrs);
}

static inline void xen_free_coherent_pages(struct device *hwdev, size_t size,
		void *cpu_addr, dma_addr_t dma_handle, unsigned long attrs)
{
	__generic_dma_ops(hwdev)->free(hwdev, size, cpu_addr, dma_handle, attrs);
}

static inline void xen_dma_map_page(struct device *hwdev, struct page *page,
	     dma_addr_t dev_addr, unsigned long offset, size_t size,
	     enum dma_data_direction dir, unsigned long attrs)
{
	unsigned long page_pfn = page_to_xen_pfn(page);
	unsigned long dev_pfn = XEN_PFN_DOWN(dev_addr);
	unsigned long compound_pages =
		(1<<compound_order(page)) * XEN_PFN_PER_PAGE;
	bool local = (page_pfn <= dev_pfn) &&
		(dev_pfn - page_pfn < compound_pages);

	/*
	 * Dom0 is mapped 1:1, while the Linux page can span across
	 * multiple Xen pages, it's not possible for it to contain a
	 * mix of local and foreign Xen pages. So if the first xen_pfn
	 * == mfn the page is local otherwise it's a foreign page
	 * grant-mapped in dom0. If the page is local we can safely
	 * call the native dma_ops function, otherwise we call the xen
	 * specific function.
	 */
	if (local)
		__generic_dma_ops(hwdev)->map_page(hwdev, page, offset, size, dir, attrs);
	else
		__xen_dma_map_page(hwdev, page, dev_addr, offset, size, dir, attrs);
}

static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
		size_t size, enum dma_data_direction dir, unsigned long attrs)
{
	unsigned long pfn = PFN_DOWN(handle);
	/*
	 * Dom0 is mapped 1:1, while the Linux page can be spanned accross
	 * multiple Xen page, it's not possible to have a mix of local and
	 * foreign Xen page. Dom0 is mapped 1:1, so calling pfn_valid on a
	 * foreign mfn will always return false. If the page is local we can
	 * safely call the native dma_ops function, otherwise we call the xen
	 * specific function.
	 */
	if (pfn_valid(pfn)) {
		if (__generic_dma_ops(hwdev)->unmap_page)
			__generic_dma_ops(hwdev)->unmap_page(hwdev, handle, size, dir, attrs);
	} else
		__xen_dma_unmap_page(hwdev, handle, size, dir, attrs);
}

static inline void xen_dma_sync_single_for_cpu(struct device *hwdev,
		dma_addr_t handle, size_t size, enum dma_data_direction dir)
{
	unsigned long pfn = PFN_DOWN(handle);
	if (pfn_valid(pfn)) {
		if (__generic_dma_ops(hwdev)->sync_single_for_cpu)
			__generic_dma_ops(hwdev)->sync_single_for_cpu(hwdev, handle, size, dir);
	} else
		__xen_dma_sync_single_for_cpu(hwdev, handle, size, dir);
}

static inline void xen_dma_sync_single_for_device(struct device *hwdev,
		dma_addr_t handle, size_t size, enum dma_data_direction dir)
{
	unsigned long pfn = PFN_DOWN(handle);
	if (pfn_valid(pfn)) {
		if (__generic_dma_ops(hwdev)->sync_single_for_device)
			__generic_dma_ops(hwdev)->sync_single_for_device(hwdev, handle, size, dir);
	} else
		__xen_dma_sync_single_for_device(hwdev, handle, size, dir);
}

#endif /* _ASM_ARM_XEN_PAGE_COHERENT_H */
825fc5c5d69753ff5558ccd&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
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<tr><th>author</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-15 16:09:50 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-15 16:09:50 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/util/dso.h?h=nds-private-remove&amp;id=99421c1cb27fb837e93b517036fab4500fe39de5'>99421c1cb27fb837e93b517036fab4500fe39de5</a> (<a href='/cgit.cgi/linux/net-next.git/patch/tools/perf/util/dso.h?id=99421c1cb27fb837e93b517036fab4500fe39de5'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=99421c1cb27fb837e93b517036fab4500fe39de5'>de5fc5bacb671223f389793ad643cebe520bc292</a> /<a href='/cgit.cgi/linux/net-next.git/tree/tools/perf/util/dso.h?h=nds-private-remove&amp;id=99421c1cb27fb837e93b517036fab4500fe39de5'>tools/perf/util/dso.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/util/dso.h?h=nds-private-remove&amp;id=c92816275674c1491ce228ee49aa030a5fa1be04'>c92816275674c1491ce228ee49aa030a5fa1be04</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/perf/util/dso.h?h=nds-private-remove&amp;id=99421c1cb27fb837e93b517036fab4500fe39de5&amp;id2=c92816275674c1491ce228ee49aa030a5fa1be04'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/util/dso.h?h=nds-private-remove&amp;id=93362fa47fe98b62e4a34ab408c4a418432e7939'>93362fa47fe98b62e4a34ab408c4a418432e7939</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/perf/util/dso.h?h=nds-private-remove&amp;id=99421c1cb27fb837e93b517036fab4500fe39de5&amp;id2=93362fa47fe98b62e4a34ab408c4a418432e7939'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace</div><div class='commit-msg'>Pull namespace fixes from Eric Biederman:
 "This tree contains 4 fixes.

  The first is a fix for a race that can causes oopses under the right
  circumstances, and that someone just recently encountered.

  Past that are several small trivial correct fixes. A real issue that
  was blocking development of an out of tree driver, but does not appear
  to have caused any actual problems for in-tree code. A potential
  deadlock that was reported by lockdep. And a deadlock people have
  experienced and took the time to track down caused by a cleanup that
  removed the code to drop a reference count"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
  sysctl: Drop reference added by grab_header in proc_sys_readdir
  pid: fix lockdep deadlock warning due to ucount_lock
  libfs: Modify mount_pseudo_xattr to be clear it is not a userspace mount
  mnt: Protect the mountpoint hashtable with mount_lock
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=99421c1cb27fb837e93b517036fab4500fe39de5'>Diffstat</a> (limited to 'tools/perf/util/dso.h')</div><table summary='diffstat' class='diffstat'>