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authorAlexey Kardashevskiy <aik@ozlabs.ru>2013-08-28 12:37:42 +0400
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-10-11 10:24:39 +0400
commit8e0861fa3c4edfc2f30dd4cf4d58d3929f7c1b23 (patch)
tree07a0b749245da2e29918d9f2121d7ca68e9b2763 /include/linux/mm.h
parent81fcfb813fe99c30f77dd3ed9a4e541d14a9ed01 (diff)
downloadlinux-8e0861fa3c4edfc2f30dd4cf4d58d3929f7c1b23.tar.xz
powerpc: Prepare to support kernel handling of IOMMU map/unmap
The current VFIO-on-POWER implementation supports only user mode driven mapping, i.e. QEMU is sending requests to map/unmap pages. However this approach is really slow, so we want to move that to KVM. Since H_PUT_TCE can be extremely performance sensitive (especially with network adapters where each packet needs to be mapped/unmapped) we chose to implement that as a "fast" hypercall directly in "real mode" (processor still in the guest context but MMU off). To be able to do that, we need to provide some facilities to access the struct page count within that real mode environment as things like the sparsemem vmemmap mappings aren't accessible. This adds an API function realmode_pfn_to_page() to get page struct when MMU is off. This adds to MM a new function put_page_unless_one() which drops a page if counter is bigger than 1. It is going to be used when MMU is off (for example, real mode on PPC64) and we want to make sure that page release will not happen in real mode as it may crash the kernel in a horrible way. CONFIG_SPARSEMEM_VMEMMAP and CONFIG_FLATMEM are supported. Cc: linux-mm@kvack.org Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'include/linux/mm.h')
-rw-r--r--include/linux/mm.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 8b6e55ee8855..1a0668e5a4ee 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -297,12 +297,26 @@ static inline int put_page_testzero(struct page *page)
/*
* Try to grab a ref unless the page has a refcount of zero, return false if
* that is the case.
+ * This can be called when MMU is off so it must not access
+ * any of the virtual mappings.
*/
static inline int get_page_unless_zero(struct page *page)
{
return atomic_inc_not_zero(&page->_count);
}
+/*
+ * Try to drop a ref unless the page has a refcount of one, return false if
+ * that is the case.
+ * This is to make sure that the refcount won't become zero after this drop.
+ * This can be called when MMU is off so it must not access
+ * any of the virtual mappings.
+ */
+static inline int put_page_unless_one(struct page *page)
+{
+ return atomic_add_unless(&page->_count, -1, 1);
+}
+
extern int page_is_ram(unsigned long pfn);
/* Support for virtually mapped pages */