Drivers: hv: vmbus: Move virt_to_hvpfn() to hyperv header
There will be more places other than vmbus where we need to calculate
the Hyper-V page PFN from a virtual address, so move virt_to_hvpfn() to
hyperv generic header.
Signed-off-by: Boqun Feng <[email protected]>
Reviewed-by: Michael Kelley <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Wei Liu <[email protected]>
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 9c19149..83456dc 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -14,6 +14,7 @@
#include <uapi/linux/hyperv.h>
+#include <linux/mm.h>
#include <linux/types.h>
#include <linux/scatterlist.h>
#include <linux/list.h>
@@ -23,6 +24,7 @@
#include <linux/mod_devicetable.h>
#include <linux/interrupt.h>
#include <linux/reciprocal_div.h>
+#include <asm/hyperv-tlfs.h>
#define MAX_PAGE_BUFFER_COUNT 32
#define MAX_MULTIPAGE_BUFFER_COUNT 32 /* 128K */
@@ -1676,4 +1678,17 @@ struct hyperv_pci_block_ops {
extern struct hyperv_pci_block_ops hvpci_block_ops;
+static inline unsigned long virt_to_hvpfn(void *addr)
+{
+ phys_addr_t paddr;
+
+ if (is_vmalloc_addr(addr))
+ paddr = page_to_phys(vmalloc_to_page(addr)) +
+ offset_in_page(addr);
+ else
+ paddr = __pa(addr);
+
+ return paddr >> HV_HYP_PAGE_SHIFT;
+}
+
#endif /* _HYPERV_H */
