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x86/intel_rdt: Add diagnostics when making directories 

Mostly this is about running out of RMIDs or CLOSIDs. Other
errors are various internal errors.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Vikas Shivappa <vikas.shivappa@intel.com>
Cc: Boris Petkov <bp@suse.de>
Cc: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lkml.kernel.org/r/027cf1ffb3a3695f2d54525813a1d644887353cf.1506382469.git.tony.luck@intel.com
This commit is contained in:
Tony Luck 2017-09-25 16:39:37 -07:00 committed by Thomas Gleixner
parent 94457b36e8
commit cfd0f34e4c
1 changed files with 22 additions and 6 deletions
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28
arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
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@ -1593,8 +1593,10 @@ static int mkdir_rdt_prepare(struct kernfs_node *parent_kn,
int ret;
prdtgrp = rdtgroup_kn_lock_live(prgrp_kn);
rdt_last_cmd_clear();
if (!prdtgrp) {
ret = -ENODEV;
rdt_last_cmd_puts("directory was removed\n");
goto out_unlock;
}
@ -1602,6 +1604,7 @@ static int mkdir_rdt_prepare(struct kernfs_node *parent_kn,
rdtgrp = kzalloc(sizeof(*rdtgrp), GFP_KERNEL);
if (!rdtgrp) {
ret = -ENOSPC;
rdt_last_cmd_puts("kernel out of memory\n");
goto out_unlock;
}
*r = rdtgrp;
@ -1613,6 +1616,7 @@ static int mkdir_rdt_prepare(struct kernfs_node *parent_kn,
kn = kernfs_create_dir(parent_kn, name, mode, rdtgrp);
if (IS_ERR(kn)) {
ret = PTR_ERR(kn);
rdt_last_cmd_puts("kernfs create error\n");
goto out_free_rgrp;
}
rdtgrp->kn = kn;
@ -1626,24 +1630,32 @@ static int mkdir_rdt_prepare(struct kernfs_node *parent_kn,
kernfs_get(kn);
ret = rdtgroup_kn_set_ugid(kn);
if (ret)
if (ret) {
rdt_last_cmd_puts("kernfs perm error\n");
goto out_destroy;
}
files = RFTYPE_BASE | RFTYPE_CTRL;
files = RFTYPE_BASE | BIT(RF_CTRLSHIFT + rtype);
ret = rdtgroup_add_files(kn, files);
if (ret)
if (ret) {
rdt_last_cmd_puts("kernfs fill error\n");
goto out_destroy;
}
if (rdt_mon_capable) {
ret = alloc_rmid();
if (ret < 0)
if (ret < 0) {
rdt_last_cmd_puts("out of RMIDs\n");
goto out_destroy;
}
rdtgrp->mon.rmid = ret;
ret = mkdir_mondata_all(kn, rdtgrp, &rdtgrp->mon.mon_data_kn);
if (ret)
if (ret) {
rdt_last_cmd_puts("kernfs subdir error\n");
goto out_idfree;
}
}
kernfs_activate(kn);
@ -1721,8 +1733,10 @@ static int rdtgroup_mkdir_ctrl_mon(struct kernfs_node *parent_kn,
kn = rdtgrp->kn;
ret = closid_alloc();
if (ret < 0)
if (ret < 0) {
rdt_last_cmd_puts("out of CLOSIDs\n");
goto out_common_fail;
}
closid = ret;
rdtgrp->closid = closid;
@ -1734,8 +1748,10 @@ static int rdtgroup_mkdir_ctrl_mon(struct kernfs_node *parent_kn,
* of tasks and cpus to monitor.
*/
ret = mongroup_create_dir(kn, NULL, "mon_groups", NULL);
if (ret)
if (ret) {
rdt_last_cmd_puts("kernfs subdir error\n");
goto out_id_free;
}
}
goto out_unlock;