lib: test_hmm add ioctl to get zone device type

Add new ioctl cmd to query zone device type.  This will be used once the
test_hmm adds zone device coherent type.

Link: https://lkml.kernel.org/r/20220715150521.18165-9-alex.sierra@amd.com
Signed-off-by: Alex Sierra <alex.sierra@amd.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Alistair Poppple <apopple@nvidia.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/lib/test_hmm.c b/lib/test_hmm.c
index f2c3015..ed737ea 100644 (file)
--- a/lib/test_hmm.c
+++ b/lib/test_hmm.c
@@ -87,6 +87,7 @@ struct dmirror_chunk {
 struct dmirror_device {
        struct cdev             cdevice;
        struct hmm_devmem       *devmem;
+       unsigned int            zone_device_type;
 
        unsigned int            devmem_capacity;
        unsigned int            devmem_count;
@@ -1266,14 +1267,20 @@ static void dmirror_device_remove(struct dmirror_device *mdevice)
 static int __init hmm_dmirror_init(void)
 {
        int ret;
-       int id;
+       int id = 0;
+       int ndevices = 0;
 
        ret = alloc_chrdev_region(&dmirror_dev, 0, DMIRROR_NDEVICES,
                                  "HMM_DMIRROR");
        if (ret)
                goto err_unreg;
 
-       for (id = 0; id < DMIRROR_NDEVICES; id++) {
+       memset(dmirror_devices, 0, DMIRROR_NDEVICES * sizeof(dmirror_devices[0]));
+       dmirror_devices[ndevices++].zone_device_type =
+                               HMM_DMIRROR_MEMORY_DEVICE_PRIVATE;
+       dmirror_devices[ndevices++].zone_device_type =
+                               HMM_DMIRROR_MEMORY_DEVICE_PRIVATE;
+       for (id = 0; id < ndevices; id++) {
                ret = dmirror_device_init(dmirror_devices + id, id);
                if (ret)
                        goto err_chrdev;

diff --git a/lib/test_hmm_uapi.h b/lib/test_hmm_uapi.h
index f14dea5..0511af7 100644 (file)
--- a/lib/test_hmm_uapi.h
+++ b/lib/test_hmm_uapi.h
@@ -31,10 +31,11 @@ struct hmm_dmirror_cmd {
 /* Expose the address space of the calling process through hmm device file */
 #define HMM_DMIRROR_READ               _IOWR('H', 0x00, struct hmm_dmirror_cmd)
 #define HMM_DMIRROR_WRITE              _IOWR('H', 0x01, struct hmm_dmirror_cmd)
-#define HMM_DMIRROR_MIGRATE            _IOWR('H', 0x02, struct hmm_dmirror_cmd)
-#define HMM_DMIRROR_SNAPSHOT           _IOWR('H', 0x03, struct hmm_dmirror_cmd)
-#define HMM_DMIRROR_EXCLUSIVE          _IOWR('H', 0x04, struct hmm_dmirror_cmd)
-#define HMM_DMIRROR_CHECK_EXCLUSIVE    _IOWR('H', 0x05, struct hmm_dmirror_cmd)
+#define HMM_DMIRROR_MIGRATE_TO_DEV     _IOWR('H', 0x02, struct hmm_dmirror_cmd)
+#define HMM_DMIRROR_MIGRATE_TO_SYS     _IOWR('H', 0x03, struct hmm_dmirror_cmd)
+#define HMM_DMIRROR_SNAPSHOT           _IOWR('H', 0x04, 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)
 
 /*
  * Values returned in hmm_dmirror_cmd.ptr for HMM_DMIRROR_SNAPSHOT.
@@ -62,4 +63,9 @@ enum {
        HMM_DMIRROR_PROT_DEV_PRIVATE_REMOTE     = 0x30,
 };
 
+enum {
+       /* 0 is reserved to catch uninitialized type fields */
+       HMM_DMIRROR_MEMORY_DEVICE_PRIVATE = 1,
+};
+
 #endif /* _LIB_TEST_HMM_UAPI_H */