In order to configure device generic in test_hmm, two
module parameters should be passed, which correspon to the
SP start address of each device (2) spm_addr_dev0 &
spm_addr_dev1. If no parameters are passed, private device
type is configured.
v5:
Remove devmem->pagemap.type = MEMORY_DEVICE_PRIVATE at
dmirror_allocate_chunk that was forcing to configure pagemap.type
to MEMORY_DEVICE_PRIVATE
v6:
Check for null pointers for resource and memremap references
at dmirror_allocate_chunk
Signed-off-by: Alex Sierra <alex.sie...@amd.com>
---
lib/test_hmm.c | 56 ++++++++++++++++++++++++++++++++-------------
lib/test_hmm_uapi.h | 1 +
2 files changed, 41 insertions(+), 16 deletions(-)
diff --git a/lib/test_hmm.c b/lib/test_hmm.c
index 3cd91ca31dd7..b4f885c6c6ae 100644
--- a/lib/test_hmm.c
+++ b/lib/test_hmm.c
@@ -33,6 +33,16 @@
#define DEVMEM_CHUNK_SIZE (256 * 1024 * 1024U)
#define DEVMEM_CHUNKS_RESERVE 16
+static unsigned long spm_addr_dev0;
+module_param(spm_addr_dev0, long, 0644);
+MODULE_PARM_DESC(spm_addr_dev0,
+ "Specify start address for SPM (special purpose memory) used
for device 0. By setting this Generic device type will be used. Make sure
spm_addr_dev1 is set too");
+
+static unsigned long spm_addr_dev1;
+module_param(spm_addr_dev1, long, 0644);
+MODULE_PARM_DESC(spm_addr_dev1,
+ "Specify start address for SPM (special purpose memory) used
for device 1. By setting this Generic device type will be used. Make sure
spm_addr_dev0 is set too");
+
static const struct dev_pagemap_ops dmirror_devmem_ops;
static const struct mmu_interval_notifier_ops dmirror_min_ops;
static dev_t dmirror_dev;
@@ -450,11 +460,11 @@ static int dmirror_write(struct dmirror *dmirror, struct
hmm_dmirror_cmd *cmd)
return ret;
}
-static bool dmirror_allocate_chunk(struct dmirror_device *mdevice,
+static int dmirror_allocate_chunk(struct dmirror_device *mdevice,
struct page **ppage)
{
struct dmirror_chunk *devmem;
- struct resource *res;
+ struct resource *res = NULL;
unsigned long pfn;
unsigned long pfn_first;
unsigned long pfn_last;
@@ -462,15 +472,26 @@ static bool dmirror_allocate_chunk(struct dmirror_device
*mdevice,
devmem = kzalloc(sizeof(*devmem), GFP_KERNEL);
if (!devmem)
- return false;
+ return -ENOMEM;
+
+ if (!spm_addr_dev0 && !spm_addr_dev1) {
+ res = request_free_mem_region(&iomem_resource,
DEVMEM_CHUNK_SIZE,
+ "hmm_dmirror");
+ devmem->pagemap.type = MEMORY_DEVICE_PRIVATE;
+ mdevice->zone_device_type = HMM_DMIRROR_MEMORY_DEVICE_PRIVATE;
+ } else if (spm_addr_dev0 && spm_addr_dev1) {
+ res = lookup_resource(&iomem_resource,
MINOR(mdevice->cdevice.dev) ?
+ spm_addr_dev0 :
+ spm_addr_dev1);
+ devmem->pagemap.type = MEMORY_DEVICE_GENERIC;
+ mdevice->zone_device_type = HMM_DMIRROR_MEMORY_DEVICE_GENERIC;
+ } else {
+ pr_err("Both spm_addr_dev parameters should be set\n");
+ }
- res = request_free_mem_region(&iomem_resource, DEVMEM_CHUNK_SIZE,
- "hmm_dmirror");
- if (IS_ERR(res))
+ if (IS_ERR_OR_NULL(res))
goto err_devmem;
- mdevice->zone_device_type = HMM_DMIRROR_MEMORY_DEVICE_PRIVATE;
- devmem->pagemap.type = MEMORY_DEVICE_PRIVATE;
devmem->pagemap.range.start = res->start;
devmem->pagemap.range.end = res->end;
devmem->pagemap.nr_range = 1;
@@ -493,10 +514,14 @@ static bool dmirror_allocate_chunk(struct dmirror_device
*mdevice,
mdevice->devmem_capacity = new_capacity;
mdevice->devmem_chunks = new_chunks;
}
-
ptr = memremap_pages(&devmem->pagemap, numa_node_id());
- if (IS_ERR(ptr))
+ if (IS_ERR_OR_NULL(ptr)) {
+ if (ptr)
+ ret = PTR_ERR(ptr);
+ else
+ ret = -EFAULT;
goto err_release;
+ }
devmem->mdevice = mdevice;
pfn_first = devmem->pagemap.range.start >> PAGE_SHIFT;
@@ -1097,10 +1122,8 @@ static int dmirror_device_init(struct dmirror_device
*mdevice, int id)
if (ret)
return ret;
- /* Build a list of free ZONE_DEVICE private struct pages */
- dmirror_allocate_chunk(mdevice, NULL);
-
- return 0;
+ /* Build a list of free ZONE_DEVICE struct pages */
+ return dmirror_allocate_chunk(mdevice, NULL);
}
static void dmirror_device_remove(struct dmirror_device *mdevice)
@@ -1113,8 +1136,9 @@ static void dmirror_device_remove(struct dmirror_device
*mdevice)
mdevice->devmem_chunks[i];
memunmap_pages(&devmem->pagemap);
- release_mem_region(devmem->pagemap.range.start,
- range_len(&devmem->pagemap.range));
+ if (devmem->pagemap.type == MEMORY_DEVICE_PRIVATE)
+ release_mem_region(devmem->pagemap.range.start,
+
range_len(&devmem->pagemap.range));
kfree(devmem);
}
kfree(mdevice->devmem_chunks);
diff --git a/lib/test_hmm_uapi.h b/lib/test_hmm_uapi.h
index ee88701793d5..17a6b5059871 100644
--- a/lib/test_hmm_uapi.h
+++ b/lib/test_hmm_uapi.h
@@ -65,6 +65,7 @@ enum {
enum {
/* 0 is reserved to catch uninitialized type fields */
HMM_DMIRROR_MEMORY_DEVICE_PRIVATE = 1,
+ HMM_DMIRROR_MEMORY_DEVICE_GENERIC,
};
#endif /* _LIB_TEST_HMM_UAPI_H */
--
2.32.0
