Add an option namely --input which passes a parameter which is a JSON file path. The JSON file contains the data usually returned by:
$ daxctl list -d dax0.1 | jq -er '.[]' > device.json { "chardev":"dax0.1", "size":34359738368, "target_node":0, "align":1073741824, "mode":"devdax", "mappings":[ { "page_offset":4194304, "start":25769803776, "end":42949672959, "size":17179869184 }, { "page_offset":0, "start":8589934592, "end":25769803775, "size":17179869184 } ] } The input values in the mapping json are decimal for now. A device can then be created by specifying this same data to re-create it e.g. $ daxctl create-device -u --input device.json { "chardev":"dax0.1", "size":"32.00 GiB (34.36 GB)", "target_node":0, "align":"1024.00 MiB (1073.74 MB)", "mode":"devdax", } $ daxctl list -d dax0.1 { "chardev":"dax0.1", "size":34359738368, "target_node":0, "align":1073741824, "mode":"devdax", "mappings":[ { "page_offset":4194304, "start":25769803776, "end":42949672959, "size":17179869184 }, { "page_offset":0, "start":8589934592, "end":25769803775, "size":17179869184 } ] } created 1 device This means we can restore/recreate previously established mappings. Signed-off-by: Joao Martins <joao.m.mart...@oracle.com> --- Documentation/daxctl/daxctl-create-device.txt | 13 +++ daxctl/device.c | 128 +++++++++++++++++++++++++- 2 files changed, 136 insertions(+), 5 deletions(-) diff --git a/Documentation/daxctl/daxctl-create-device.txt b/Documentation/daxctl/daxctl-create-device.txt index 7f64719d16f2..05f4dbd9d61c 100644 --- a/Documentation/daxctl/daxctl-create-device.txt +++ b/Documentation/daxctl/daxctl-create-device.txt @@ -90,6 +90,19 @@ include::region-option.txt[] to 2M. Note that "devdax" mode enforces all mappings to be aligned to this value, i.e. it fails unaligned mapping attempts. +--input:: + Applications that want to select ranges assigned to a device-dax + instance, or wanting to establish previously created devices, can + pass an input JSON file. The file option lets a user pass a JSON + object similar to the one listed with "daxctl list". + + The device name is not re-created, but if a "chardev" is passed in + the JSON file, it will use that to get the region id. + + Note that the JSON content in the file cannot be an array of + JSON objects but rather a single JSON object i.e. without the + array enclosing brackets. + include::human-option.txt[] include::verbose-option.txt[] diff --git a/daxctl/device.c b/daxctl/device.c index 3c2d4e3d8b48..fe4291199312 100644 --- a/daxctl/device.c +++ b/daxctl/device.c @@ -13,6 +13,7 @@ #include <util/json.h> #include <util/filter.h> #include <json-c/json.h> +#include <json-c/json_util.h> #include <daxctl/libdaxctl.h> #include <util/parse-options.h> #include <ccan/array_size/array_size.h> @@ -23,6 +24,7 @@ static struct { const char *region; const char *size; const char *align; + const char *input; bool no_online; bool no_movable; bool force; @@ -36,10 +38,16 @@ enum dev_mode { DAXCTL_DEV_MODE_RAM, }; +struct mapping { + unsigned long long start, end, pgoff; +}; + static enum dev_mode reconfig_mode = DAXCTL_DEV_MODE_UNKNOWN; static long long align = -1; static long long size = -1; static unsigned long flags; +static struct mapping *maps = NULL; +static long long nmaps = -1; enum memory_zone { MEM_ZONE_MOVABLE, @@ -71,7 +79,8 @@ OPT_BOOLEAN('f', "force", ¶m.force, \ #define CREATE_OPTIONS() \ OPT_STRING('s', "size", ¶m.size, "size", "size to switch the device to"), \ -OPT_STRING('a', "align", ¶m.align, "align", "alignment to switch the device to") +OPT_STRING('a', "align", ¶m.align, "align", "alignment to switch the device to"), \ +OPT_STRING('\0', "input", ¶m.input, "input", "input device JSON file") #define DESTROY_OPTIONS() \ OPT_BOOLEAN('f', "force", ¶m.force, \ @@ -124,6 +133,94 @@ static const struct option destroy_options[] = { OPT_END(), }; +static int sort_mappings(const void *a, const void *b) +{ + json_object **jsoa, **jsob; + struct json_object *va, *vb; + unsigned long long pga, pgb; + + jsoa = (json_object **)a; + jsob = (json_object **)b; + if (!*jsoa && !*jsob) + return 0; + + if (!json_object_object_get_ex(*jsoa, "page_offset", &va) || + !json_object_object_get_ex(*jsob, "page_offset", &vb)) + return 0; + + pga = json_object_get_int64(va); + pgb = json_object_get_int64(vb); + + return pga > pgb; +} + +static int parse_device_file(const char *filename) +{ + struct json_object *jobj, *jval = NULL, *jmappings = NULL; + int i, len, rc = -EINVAL, region_id, id; + const char *chardev; + char *region = NULL; + struct mapping *m; + + jobj = json_object_from_file(filename); + if (!jobj) + return rc; + + if (!json_object_object_get_ex(jobj, "align", &jval)) + return rc; + param.align = json_object_get_string(jval); + + if (!json_object_object_get_ex(jobj, "size", &jval)) + return rc; + param.size = json_object_get_string(jval); + + if (!json_object_object_get_ex(jobj, "chardev", &jval)) + return rc; + chardev = json_object_get_string(jval); + if (sscanf(chardev, "dax%u.%u", ®ion_id, &id) != 2) + return rc; + if (asprintf(®ion, "%u", region_id) < 0) + return rc; + param.region = region; + + if (!json_object_object_get_ex(jobj, "mappings", &jmappings)) + return rc; + json_object_array_sort(jmappings, sort_mappings); + + len = json_object_array_length(jmappings); + m = calloc(len, sizeof(*m)); + if (!m) + return -ENOMEM; + + for (i = 0; i < len; i++) { + struct json_object *j, *val; + + j = json_object_array_get_idx(jmappings, i); + if (!j) + goto err; + + if (!json_object_object_get_ex(j, "start", &val)) + goto err; + m[i].start = json_object_get_int64(val); + + if (!json_object_object_get_ex(j, "end", &val)) + goto err; + m[i].end = json_object_get_int64(val); + + if (!json_object_object_get_ex(j, "page_offset", &val)) + goto err; + m[i].pgoff = json_object_get_int64(val); + } + maps = m; + nmaps = len; + rc = 0; + +err: + if (!maps) + free(m); + return rc; +} + static const char *parse_device_options(int argc, const char **argv, enum device_action action, const struct option *options, const char *usage, struct daxctl_ctx *ctx) @@ -214,6 +311,13 @@ static const char *parse_device_options(int argc, const char **argv, } break; case ACTION_CREATE: + if (param.input && + (rc = parse_device_file(param.input)) != 0) { + fprintf(stderr, + "error: failed to parse device file: %s\n", + strerror(-rc)); + break; + } if (param.size) size = __parse_size64(param.size, &units); if (param.align) @@ -525,7 +629,8 @@ static int do_create(struct daxctl_region *region, long long val, { struct json_object *jdev; struct daxctl_dev *dev; - int rc = 0; + int i, rc = 0; + long long alloc = 0; if (daxctl_region_create_dev(region)) return -ENOSPC; @@ -546,9 +651,22 @@ static int do_create(struct daxctl_region *region, long long val, return rc; } - rc = daxctl_dev_set_size(dev, val); - if (rc < 0) - return rc; + /* @maps is ordered by page_offset */ + for (i = 0; i < nmaps; i++) { + rc = daxctl_dev_set_mapping(dev, maps[i].start, maps[i].end); + if (rc < 0) + return rc; + alloc += (maps[i].end - maps[i].start + 1); + } + + if (nmaps > 0 && val > 0 && alloc != val) { + fprintf(stderr, "%s: allocated %lld but specified size %lld\n", + daxctl_dev_get_devname(dev), alloc, val); + } else { + rc = daxctl_dev_set_size(dev, val); + if (rc < 0) + return rc; + } rc = daxctl_dev_enable_devdax(dev); if (rc) { -- 1.8.3.1 _______________________________________________ Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org To unsubscribe send an email to linux-nvdimm-le...@lists.01.org