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Diffstat (limited to 'include/linux/hmm.h')
-rw-r--r--include/linux/hmm.h33
1 files changed, 23 insertions, 10 deletions
diff --git a/include/linux/hmm.h b/include/linux/hmm.h
index dde947083d4e..c6fb869a81c0 100644
--- a/include/linux/hmm.h
+++ b/include/linux/hmm.h
@@ -11,7 +11,7 @@
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
- * Authors: Jérôme Glisse <jglisse@redhat.com>
+ * Authors: Jérôme Glisse <jglisse@redhat.com>
*/
/*
* Heterogeneous Memory Management (HMM)
@@ -274,14 +274,29 @@ static inline uint64_t hmm_pfn_from_pfn(const struct hmm_range *range,
struct hmm_mirror;
/*
- * enum hmm_update_type - type of update
+ * enum hmm_update_event - type of update
* @HMM_UPDATE_INVALIDATE: invalidate range (no indication as to why)
*/
-enum hmm_update_type {
+enum hmm_update_event {
HMM_UPDATE_INVALIDATE,
};
/*
+ * struct hmm_update - HMM update informations for callback
+ *
+ * @start: virtual start address of the range to update
+ * @end: virtual end address of the range to update
+ * @event: event triggering the update (what is happening)
+ * @blockable: can the callback block/sleep ?
+ */
+struct hmm_update {
+ unsigned long start;
+ unsigned long end;
+ enum hmm_update_event event;
+ bool blockable;
+};
+
+/*
* struct hmm_mirror_ops - HMM mirror device operations callback
*
* @update: callback to update range on a device
@@ -300,9 +315,9 @@ struct hmm_mirror_ops {
/* sync_cpu_device_pagetables() - synchronize page tables
*
* @mirror: pointer to struct hmm_mirror
- * @update_type: type of update that occurred to the CPU page table
- * @start: virtual start address of the range to update
- * @end: virtual end address of the range to update
+ * @update: update informations (see struct hmm_update)
+ * Returns: -EAGAIN if update.blockable false and callback need to
+ * block, 0 otherwise.
*
* This callback ultimately originates from mmu_notifiers when the CPU
* page table is updated. The device driver must update its page table
@@ -313,10 +328,8 @@ struct hmm_mirror_ops {
* page tables are completely updated (TLBs flushed, etc); this is a
* synchronous call.
*/
- void (*sync_cpu_device_pagetables)(struct hmm_mirror *mirror,
- enum hmm_update_type update_type,
- unsigned long start,
- unsigned long end);
+ int (*sync_cpu_device_pagetables)(struct hmm_mirror *mirror,
+ const struct hmm_update *update);
};
/*