Add a new flag HMM_DMIRROR_FLAG_FAIL_ALLOC to emulate
failure of allocating a large page. This tests the code paths
involving split migration.
Signed-off-by: Balbir Singh <balb...@nvidia.com>
---
lib/test_hmm.c | 12 +++++++++++-
lib/test_hmm_uapi.h | 3 +++
2 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/lib/test_hmm.c b/lib/test_hmm.c
index 18b6a7b061d7..36209184c430 100644
--- a/lib/test_hmm.c
+++ b/lib/test_hmm.c
@@ -92,6 +92,7 @@ struct dmirror {
struct xarray pt;
struct mmu_interval_notifier notifier;
struct mutex mutex;
+ __u64 flags;
};
/*
@@ -699,7 +700,12 @@ static void dmirror_migrate_alloc_and_copy(struct
migrate_vma *args,
page_to_pfn(spage)))
goto next;
- dpage = dmirror_devmem_alloc_page(dmirror, is_large);
+ if (dmirror->flags & HMM_DMIRROR_FLAG_FAIL_ALLOC) {
+ dmirror->flags &= ~HMM_DMIRROR_FLAG_FAIL_ALLOC;
+ dpage = NULL;
+ } else
+ dpage = dmirror_devmem_alloc_page(dmirror, is_large);
+
if (!dpage) {
struct folio *folio;
unsigned long i;
@@ -1504,6 +1510,10 @@ static long dmirror_fops_unlocked_ioctl(struct file
*filp,
dmirror_device_remove_chunks(dmirror->mdevice);
ret = 0;
break;
+ case HMM_DMIRROR_FLAGS:
+ dmirror->flags = cmd.npages;
+ ret = 0;
+ break;
default:
return -EINVAL;
diff --git a/lib/test_hmm_uapi.h b/lib/test_hmm_uapi.h
index 8c818a2cf4f6..f94c6d457338 100644
--- a/lib/test_hmm_uapi.h
+++ b/lib/test_hmm_uapi.h
@@ -37,6 +37,9 @@ struct hmm_dmirror_cmd {
#define HMM_DMIRROR_EXCLUSIVE _IOWR('H', 0x05, struct hmm_dmirror_cmd)
#define HMM_DMIRROR_CHECK_EXCLUSIVE _IOWR('H', 0x06, struct hmm_dmirror_cmd)
#define HMM_DMIRROR_RELEASE _IOWR('H', 0x07, struct hmm_dmirror_cmd)
+#define HMM_DMIRROR_FLAGS _IOWR('H', 0x08, struct hmm_dmirror_cmd)
+
+#define HMM_DMIRROR_FLAG_FAIL_ALLOC (1ULL << 0)
/*
* Values returned in hmm_dmirror_cmd.ptr for HMM_DMIRROR_SNAPSHOT.
--
2.48.1
