xen/grant-table: remove gnttab_*transfer*() functions

All grant table operations related to the "transfer" functionality
are unused currently. There have been users in the old days of the
"Xen-o-Linux" kernel, but those didn't make it upstream.

So remove the "transfer" related functions.

Signed-off-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20220311103429.12845-2-jgross@suse.com
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index 5c83d41..8963af8 100644 (file)
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@ -109,7 +109,7 @@ struct gnttab_ops {
        void (*unmap_frames)(void);
        /*
         * Introducing a valid entry into the grant table, granting the frame of
-        * this grant entry to domain for accessing or transfering. Ref
+        * this grant entry to domain for accessing. Ref
         * parameter is reference of this introduced grant entry, domid is id of
         * granted domain, frame is the page frame to be granted, and flags is
         * status of the grant entry to be updated.
@@ -125,14 +125,6 @@ struct gnttab_ops {
         * access for this entry and return success(==1).
         */
        int (*end_foreign_access_ref)(grant_ref_t ref, int readonly);
-       /*
-        * Stop granting a grant entry to domain for transfer. Ref parameter is
-        * reference of a grant entry whose grant transfer will be stopped. If
-        * tranfer has not started, just reclaim the grant entry and return
-        * failure(==0). Otherwise, wait for the transfer to complete and then
-        * return the frame.
-        */
-       unsigned long (*end_foreign_transfer_ref)(grant_ref_t ref);
        /*
         * Read the frame number related to a given grant reference.
         */
@@ -230,10 +222,7 @@ static void put_free_entry(grant_ref_t ref)
  * Following applies to gnttab_update_entry_v1 and gnttab_update_entry_v2.
  * Introducing a valid entry into the grant table:
  *  1. Write ent->domid.
- *  2. Write ent->frame:
- *      GTF_permit_access:   Frame to which access is permitted.
- *      GTF_accept_transfer: Pseudo-phys frame slot being filled by new
- *                           frame, or zero if none.
+ *  2. Write ent->frame: Frame to which access is permitted.
  *  3. Write memory barrier (WMB).
  *  4. Write ent->flags, inc. valid type.
  */
@@ -455,102 +444,6 @@ void gnttab_end_foreign_access(grant_ref_t ref, int readonly,
 }
 EXPORT_SYMBOL_GPL(gnttab_end_foreign_access);
 
-int gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn)
-{
-       int ref;
-
-       ref = get_free_entries(1);
-       if (unlikely(ref < 0))
-               return -ENOSPC;
-       gnttab_grant_foreign_transfer_ref(ref, domid, pfn);
-
-       return ref;
-}
-EXPORT_SYMBOL_GPL(gnttab_grant_foreign_transfer);
-
-void gnttab_grant_foreign_transfer_ref(grant_ref_t ref, domid_t domid,
-                                      unsigned long pfn)
-{
-       gnttab_interface->update_entry(ref, domid, pfn, GTF_accept_transfer);
-}
-EXPORT_SYMBOL_GPL(gnttab_grant_foreign_transfer_ref);
-
-static unsigned long gnttab_end_foreign_transfer_ref_v1(grant_ref_t ref)
-{
-       unsigned long frame;
-       u16           flags;
-       u16          *pflags;
-
-       pflags = &gnttab_shared.v1[ref].flags;
-
-       /*
-        * If a transfer is not even yet started, try to reclaim the grant
-        * reference and return failure (== 0).
-        */
-       while (!((flags = *pflags) & GTF_transfer_committed)) {
-               if (sync_cmpxchg(pflags, flags, 0) == flags)
-                       return 0;
-               cpu_relax();
-       }
-
-       /* If a transfer is in progress then wait until it is completed. */
-       while (!(flags & GTF_transfer_completed)) {
-               flags = *pflags;
-               cpu_relax();
-       }
-
-       rmb();  /* Read the frame number /after/ reading completion status. */
-       frame = gnttab_shared.v1[ref].frame;
-       BUG_ON(frame == 0);
-
-       return frame;
-}
-
-static unsigned long gnttab_end_foreign_transfer_ref_v2(grant_ref_t ref)
-{
-       unsigned long frame;
-       u16           flags;
-       u16          *pflags;
-
-       pflags = &gnttab_shared.v2[ref].hdr.flags;
-
-       /*
-        * If a transfer is not even yet started, try to reclaim the grant
-        * reference and return failure (== 0).
-        */
-       while (!((flags = *pflags) & GTF_transfer_committed)) {
-               if (sync_cmpxchg(pflags, flags, 0) == flags)
-                       return 0;
-               cpu_relax();
-       }
-
-       /* If a transfer is in progress then wait until it is completed. */
-       while (!(flags & GTF_transfer_completed)) {
-               flags = *pflags;
-               cpu_relax();
-       }
-
-       rmb();  /* Read the frame number /after/ reading completion status. */
-       frame = gnttab_shared.v2[ref].full_page.frame;
-       BUG_ON(frame == 0);
-
-       return frame;
-}
-
-unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref)
-{
-       return gnttab_interface->end_foreign_transfer_ref(ref);
-}
-EXPORT_SYMBOL_GPL(gnttab_end_foreign_transfer_ref);
-
-unsigned long gnttab_end_foreign_transfer(grant_ref_t ref)
-{
-       unsigned long frame = gnttab_end_foreign_transfer_ref(ref);
-       put_free_entry(ref);
-       return frame;
-}
-EXPORT_SYMBOL_GPL(gnttab_end_foreign_transfer);
-
 void gnttab_free_grant_reference(grant_ref_t ref)
 {
        put_free_entry(ref);
@@ -1423,7 +1316,6 @@ static const struct gnttab_ops gnttab_v1_ops = {
        .unmap_frames                   = gnttab_unmap_frames_v1,
        .update_entry                   = gnttab_update_entry_v1,
        .end_foreign_access_ref         = gnttab_end_foreign_access_ref_v1,
-       .end_foreign_transfer_ref       = gnttab_end_foreign_transfer_ref_v1,
        .read_frame                     = gnttab_read_frame_v1,
 };
 
@@ -1435,7 +1327,6 @@ static const struct gnttab_ops gnttab_v2_ops = {
        .unmap_frames                   = gnttab_unmap_frames_v2,
        .update_entry                   = gnttab_update_entry_v2,
        .end_foreign_access_ref         = gnttab_end_foreign_access_ref_v2,
-       .end_foreign_transfer_ref       = gnttab_end_foreign_transfer_ref_v2,
        .read_frame                     = gnttab_read_frame_v2,
 };
 

diff --git a/include/xen/grant_table.h b/include/xen/grant_table.h
index c9fea93..9f9b1a2 100644 (file)
--- a/include/xen/grant_table.h
+++ b/include/xen/grant_table.h
@@ -125,11 +125,6 @@ void gnttab_end_foreign_access(grant_ref_t ref, int readonly,
  */
 int gnttab_try_end_foreign_access(grant_ref_t ref);
 
-int gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn);
-
-unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref);
-unsigned long gnttab_end_foreign_transfer(grant_ref_t ref);
-
 /*
  * operations on reserved batches of grant references
  */
@@ -162,9 +157,6 @@ static inline void gnttab_page_grant_foreign_access_ref_one(
                                        readonly);
 }
 
-void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid,
-                                      unsigned long pfn);
-
 static inline void
 gnttab_set_map_op(struct gnttab_map_grant_ref *map, phys_addr_t addr,
                  uint32_t flags, grant_ref_t ref, domid_t domid)