From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 47CA32194EB7A for ; Wed, 24 Jul 2019 15:00:16 -0700 (PDT) From: Vishal Verma Subject: [ndctl PATCH v7 09/13] daxctl: add commands to online and offline memory Date: Wed, 24 Jul 2019 15:57:37 -0600 Message-Id: <20190724215741.18556-10-vishal.l.verma@intel.com> In-Reply-To: <20190724215741.18556-1-vishal.l.verma@intel.com> References: <20190724215741.18556-1-vishal.l.verma@intel.com> MIME-Version: 1.0 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" To: linux-nvdimm@lists.01.org Cc: Dave Hansen , Pavel Tatashin List-ID: Add two new commands: daxctl-online-memory daxctl-offline-memory to manage the state of hot-plugged memory from the system-ram mode for dax devices. This provides a way for the user to online/offline the memory as a separate step from the reconfiguration. Without this, a user that reconfigures a device into the system-ram mode with the --no-online option, would have no way to later online the memory, and would have to resort to shell scripting to online them manually via sysfs. Cc: Dan Williams Cc: Dave Hansen Signed-off-by: Vishal Verma --- daxctl/builtin.h | 2 + daxctl/daxctl.c | 2 + daxctl/device.c | 131 ++++++++++++++++++++++++++++++++++++++++++++++- 3 files changed, 134 insertions(+), 1 deletion(-) diff --git a/daxctl/builtin.h b/daxctl/builtin.h index 756ba2a..f5a0147 100644 --- a/daxctl/builtin.h +++ b/daxctl/builtin.h @@ -7,4 +7,6 @@ struct daxctl_ctx; int cmd_list(int argc, const char **argv, struct daxctl_ctx *ctx); int cmd_migrate(int argc, const char **argv, struct daxctl_ctx *ctx); int cmd_reconfig_device(int argc, const char **argv, struct daxctl_ctx *ctx); +int cmd_online_memory(int argc, const char **argv, struct daxctl_ctx *ctx); +int cmd_offline_memory(int argc, const char **argv, struct daxctl_ctx *ctx); #endif /* _DAXCTL_BUILTIN_H_ */ diff --git a/daxctl/daxctl.c b/daxctl/daxctl.c index e1ba7b8..1ab0732 100644 --- a/daxctl/daxctl.c +++ b/daxctl/daxctl.c @@ -72,6 +72,8 @@ static struct cmd_struct commands[] = { { "help", .d_fn = cmd_help }, { "migrate-device-model", .d_fn = cmd_migrate }, { "reconfigure-device", .d_fn = cmd_reconfig_device }, + { "online-memory", .d_fn = cmd_online_memory }, + { "offline-memory", .d_fn = cmd_offline_memory }, }; int main(int argc, const char **argv) diff --git a/daxctl/device.c b/daxctl/device.c index a71ebbe..64eff04 100644 --- a/daxctl/device.c +++ b/daxctl/device.c @@ -36,6 +36,8 @@ static unsigned long flags; enum device_action { ACTION_RECONFIG, + ACTION_ONLINE, + ACTION_OFFLINE, }; #define BASE_OPTIONS() \ @@ -56,6 +58,11 @@ static const struct option reconfig_options[] = { OPT_END(), }; +static const struct option memory_options[] = { + BASE_OPTIONS(), + OPT_END(), +}; + 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) @@ -76,6 +83,12 @@ static const char *parse_device_options(int argc, const char **argv, case ACTION_RECONFIG: action_string = "reconfigure"; break; + case ACTION_ONLINE: + action_string = "online memory for"; + break; + case ACTION_OFFLINE: + action_string = "offline memory for"; + break; default: action_string = "<>"; break; @@ -124,6 +137,10 @@ static const char *parse_device_options(int argc, const char **argv, } } break; + case ACTION_ONLINE: + case ACTION_OFFLINE: + /* nothing special */ + break; } if (rc) { usage_with_options(u, options); @@ -286,10 +303,75 @@ static int do_reconfig(struct daxctl_dev *dev, enum dev_mode mode, return rc; } +static int do_xline(struct daxctl_dev *dev, enum device_action action) +{ + struct daxctl_memory *mem = daxctl_dev_get_memory(dev); + const char *devname = daxctl_dev_get_devname(dev); + int rc, num_online; + + if (!daxctl_dev_is_enabled(dev)) { + fprintf(stderr, + "%s: memory operations not possible when disabled\n", + devname); + return -ENXIO; + } + + if (!mem) { + fprintf(stderr, + "%s: memory operations are not applicable in devdax mode\n", + devname); + return -ENXIO; + } + + /* We are enabled, and in the correct mode. Proceed. */ + num_online = daxctl_memory_is_online(mem); + if (num_online < 0) { + fprintf(stderr, "%s: unable to determine online state: %s\n", + devname, strerror(-num_online)); + return num_online; + } + + switch (action) { + case ACTION_ONLINE: + if (num_online > 0) + fprintf(stderr, "%s: %d section%s already online\n", + devname, num_online, + num_online == 1 ? "" : "s"); + rc = daxctl_memory_set_online(mem); + if (rc < 0) { + fprintf(stderr, "%s: unable to online memory: %s\n", + devname, strerror(-rc)); + return rc; + } + fprintf(stderr, "%s: %d new section%s onlined\n", devname, rc, + rc == 1 ? "" : "s"); + break; + case ACTION_OFFLINE: + if (num_online == 0) { + fprintf(stderr, "%s: all sections already offline\n", + devname); + return 0; + } + rc = daxctl_memory_set_offline(mem); + if (rc < 0) { + fprintf(stderr, "%s: unable to offline memory: %s\n", + devname, strerror(-rc)); + return rc; + } + fprintf(stderr, "%s: %d section%s offlined\n", devname, rc, + rc == 1 ? "" : "s"); + break; + default: + fprintf(stderr, "%s: invalid action: %d\n", devname, action); + return -EINVAL; + } + return 0; +} + static int do_xaction_device(const char *device, enum device_action action, struct daxctl_ctx *ctx, int *processed) { - struct json_object *jdevs = json_object_new_array(); + struct json_object *jdevs = NULL; struct daxctl_region *region; struct daxctl_dev *dev; int rc = -ENXIO; @@ -307,10 +389,23 @@ static int do_xaction_device(const char *device, enum device_action action, switch (action) { case ACTION_RECONFIG: + /* reconfig needs jdevs, initialize it once */ + if (!jdevs) + jdevs = json_object_new_array(); rc = do_reconfig(dev, reconfig_mode, jdevs); if (rc == 0) (*processed)++; break; + case ACTION_ONLINE: + rc = do_xline(dev, action); + if (rc == 0) + (*processed)++; + break; + case ACTION_OFFLINE: + rc = do_xline(dev, action); + if (rc == 0) + (*processed)++; + break; default: rc = -EINVAL; break; @@ -345,3 +440,37 @@ int cmd_reconfig_device(int argc, const char **argv, struct daxctl_ctx *ctx) processed == 1 ? "" : "s"); return rc; } + +int cmd_online_memory(int argc, const char **argv, struct daxctl_ctx *ctx) +{ + char *usage = "daxctl online-memory []"; + const char *device = parse_device_options(argc, argv, ACTION_ONLINE, + memory_options, usage, ctx); + int processed, rc; + + rc = do_xaction_device(device, ACTION_ONLINE, ctx, &processed); + if (rc < 0) + fprintf(stderr, "error onlining memory: %s\n", + strerror(-rc)); + + fprintf(stderr, "onlined memory for %d device%s\n", processed, + processed == 1 ? "" : "s"); + return rc; +} + +int cmd_offline_memory(int argc, const char **argv, struct daxctl_ctx *ctx) +{ + char *usage = "daxctl offline-memory []"; + const char *device = parse_device_options(argc, argv, ACTION_OFFLINE, + memory_options, usage, ctx); + int processed, rc; + + rc = do_xaction_device(device, ACTION_OFFLINE, ctx, &processed); + if (rc < 0) + fprintf(stderr, "error offlining memory: %s\n", + strerror(-rc)); + + fprintf(stderr, "offlined memory for %d device%s\n", processed, + processed == 1 ? "" : "s"); + return rc; +} -- 2.20.1 _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm