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![Borislav Petkov](/assets/img/avatar_default.png)
Philip Müller reported a hang when booting 32-bit 4.1 kernel on an AMD box. A fragment of the splat was enough to pinpoint the issue: task: f58e0000 ti: f58e8000 task.ti: f58e800 EIP: 0060:[<c135a903>] EFLAGS: 00010206 CPU: 0 EIP is at free_cache_attributes+0x83/0xd0 EAX: 00000001 EBX: f589d46c ECX: 00000090 EDX: 360c2000 ESI: 00000000 EDI: c1724a80 EBP: f58e9ec0 ESP: f58e9ea0 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 CR0: 8005003b CR2: 000000ac CR3: 01731000 CR4: 000006d0 cache_shared_cpu_map_setup() did check sibling CPUs cacheinfo descriptor while the respective teardown path cache_shared_cpu_map_remove() didn't. Fix that. >From tglx's version: to be on the safe side, move the cacheinfo descriptor check to free_cache_attributes(), thus cleaning up the hotplug path a little and making this even more robust. Reported-and-tested-by: Philip Müller <philm@manjaro.org> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Sudeep Holla <sudeep.holla@arm.com> Cc: <stable@vger.kernel.org> # 4.1 Cc: Andre Przywara <andre.przywara@arm.com> Cc: Guenter Roeck <linux@roeck-us.net> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: linux-kernel@vger.kernel.org Cc: manjaro-dev@manjaro.org Cc: Philip Müller <philm@manjaro.org> Link: https://lkml.kernel.org/r/55B47BB8.6080202@manjaro.org Signed-off-by: Borislav Petkov <bp@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
554 lines
14 KiB
C
554 lines
14 KiB
C
/*
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* cacheinfo support - processor cache information via sysfs
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*
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* Based on arch/x86/kernel/cpu/intel_cacheinfo.c
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* Author: Sudeep Holla <sudeep.holla@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/bitops.h>
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#include <linux/cacheinfo.h>
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#include <linux/compiler.h>
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#include <linux/cpu.h>
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/of.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/smp.h>
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#include <linux/sysfs.h>
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/* pointer to per cpu cacheinfo */
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static DEFINE_PER_CPU(struct cpu_cacheinfo, ci_cpu_cacheinfo);
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#define ci_cacheinfo(cpu) (&per_cpu(ci_cpu_cacheinfo, cpu))
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#define cache_leaves(cpu) (ci_cacheinfo(cpu)->num_leaves)
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#define per_cpu_cacheinfo(cpu) (ci_cacheinfo(cpu)->info_list)
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struct cpu_cacheinfo *get_cpu_cacheinfo(unsigned int cpu)
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{
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return ci_cacheinfo(cpu);
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}
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#ifdef CONFIG_OF
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static int cache_setup_of_node(unsigned int cpu)
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{
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struct device_node *np;
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struct cacheinfo *this_leaf;
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struct device *cpu_dev = get_cpu_device(cpu);
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struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
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unsigned int index = 0;
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/* skip if of_node is already populated */
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if (this_cpu_ci->info_list->of_node)
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return 0;
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if (!cpu_dev) {
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pr_err("No cpu device for CPU %d\n", cpu);
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return -ENODEV;
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}
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np = cpu_dev->of_node;
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if (!np) {
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pr_err("Failed to find cpu%d device node\n", cpu);
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return -ENOENT;
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}
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while (index < cache_leaves(cpu)) {
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this_leaf = this_cpu_ci->info_list + index;
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if (this_leaf->level != 1)
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np = of_find_next_cache_node(np);
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else
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np = of_node_get(np);/* cpu node itself */
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if (!np)
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break;
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this_leaf->of_node = np;
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index++;
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}
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if (index != cache_leaves(cpu)) /* not all OF nodes populated */
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return -ENOENT;
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return 0;
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}
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static inline bool cache_leaves_are_shared(struct cacheinfo *this_leaf,
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struct cacheinfo *sib_leaf)
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{
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return sib_leaf->of_node == this_leaf->of_node;
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}
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#else
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static inline int cache_setup_of_node(unsigned int cpu) { return 0; }
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static inline bool cache_leaves_are_shared(struct cacheinfo *this_leaf,
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struct cacheinfo *sib_leaf)
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{
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/*
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* For non-DT systems, assume unique level 1 cache, system-wide
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* shared caches for all other levels. This will be used only if
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* arch specific code has not populated shared_cpu_map
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*/
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return !(this_leaf->level == 1);
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}
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#endif
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static int cache_shared_cpu_map_setup(unsigned int cpu)
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{
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struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
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struct cacheinfo *this_leaf, *sib_leaf;
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unsigned int index;
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int ret;
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ret = cache_setup_of_node(cpu);
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if (ret)
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return ret;
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for (index = 0; index < cache_leaves(cpu); index++) {
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unsigned int i;
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this_leaf = this_cpu_ci->info_list + index;
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/* skip if shared_cpu_map is already populated */
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if (!cpumask_empty(&this_leaf->shared_cpu_map))
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continue;
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cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map);
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for_each_online_cpu(i) {
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struct cpu_cacheinfo *sib_cpu_ci = get_cpu_cacheinfo(i);
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if (i == cpu || !sib_cpu_ci->info_list)
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continue;/* skip if itself or no cacheinfo */
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sib_leaf = sib_cpu_ci->info_list + index;
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if (cache_leaves_are_shared(this_leaf, sib_leaf)) {
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cpumask_set_cpu(cpu, &sib_leaf->shared_cpu_map);
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cpumask_set_cpu(i, &this_leaf->shared_cpu_map);
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}
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}
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}
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return 0;
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}
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static void cache_shared_cpu_map_remove(unsigned int cpu)
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{
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struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
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struct cacheinfo *this_leaf, *sib_leaf;
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unsigned int sibling, index;
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for (index = 0; index < cache_leaves(cpu); index++) {
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this_leaf = this_cpu_ci->info_list + index;
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for_each_cpu(sibling, &this_leaf->shared_cpu_map) {
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struct cpu_cacheinfo *sib_cpu_ci;
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if (sibling == cpu) /* skip itself */
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continue;
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sib_cpu_ci = get_cpu_cacheinfo(sibling);
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if (!sib_cpu_ci->info_list)
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continue;
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sib_leaf = sib_cpu_ci->info_list + index;
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cpumask_clear_cpu(cpu, &sib_leaf->shared_cpu_map);
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cpumask_clear_cpu(sibling, &this_leaf->shared_cpu_map);
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}
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of_node_put(this_leaf->of_node);
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}
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}
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static void free_cache_attributes(unsigned int cpu)
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{
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if (!per_cpu_cacheinfo(cpu))
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return;
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cache_shared_cpu_map_remove(cpu);
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kfree(per_cpu_cacheinfo(cpu));
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per_cpu_cacheinfo(cpu) = NULL;
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}
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int __weak init_cache_level(unsigned int cpu)
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{
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return -ENOENT;
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}
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int __weak populate_cache_leaves(unsigned int cpu)
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{
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return -ENOENT;
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}
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static int detect_cache_attributes(unsigned int cpu)
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{
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int ret;
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if (init_cache_level(cpu) || !cache_leaves(cpu))
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return -ENOENT;
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per_cpu_cacheinfo(cpu) = kcalloc(cache_leaves(cpu),
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sizeof(struct cacheinfo), GFP_KERNEL);
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if (per_cpu_cacheinfo(cpu) == NULL)
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return -ENOMEM;
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ret = populate_cache_leaves(cpu);
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if (ret)
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goto free_ci;
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/*
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* For systems using DT for cache hierarchy, of_node and shared_cpu_map
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* will be set up here only if they are not populated already
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*/
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ret = cache_shared_cpu_map_setup(cpu);
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if (ret) {
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pr_warn("Unable to detect cache hierarchy from DT for CPU %d\n",
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cpu);
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goto free_ci;
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}
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return 0;
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free_ci:
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free_cache_attributes(cpu);
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return ret;
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}
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/* pointer to cpuX/cache device */
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static DEFINE_PER_CPU(struct device *, ci_cache_dev);
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#define per_cpu_cache_dev(cpu) (per_cpu(ci_cache_dev, cpu))
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static cpumask_t cache_dev_map;
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/* pointer to array of devices for cpuX/cache/indexY */
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static DEFINE_PER_CPU(struct device **, ci_index_dev);
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#define per_cpu_index_dev(cpu) (per_cpu(ci_index_dev, cpu))
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#define per_cache_index_dev(cpu, idx) ((per_cpu_index_dev(cpu))[idx])
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#define show_one(file_name, object) \
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static ssize_t file_name##_show(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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struct cacheinfo *this_leaf = dev_get_drvdata(dev); \
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return sprintf(buf, "%u\n", this_leaf->object); \
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}
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show_one(level, level);
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show_one(coherency_line_size, coherency_line_size);
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show_one(number_of_sets, number_of_sets);
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show_one(physical_line_partition, physical_line_partition);
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show_one(ways_of_associativity, ways_of_associativity);
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static ssize_t size_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct cacheinfo *this_leaf = dev_get_drvdata(dev);
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return sprintf(buf, "%uK\n", this_leaf->size >> 10);
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}
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static ssize_t shared_cpumap_show_func(struct device *dev, bool list, char *buf)
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{
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struct cacheinfo *this_leaf = dev_get_drvdata(dev);
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const struct cpumask *mask = &this_leaf->shared_cpu_map;
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return cpumap_print_to_pagebuf(list, buf, mask);
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}
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static ssize_t shared_cpu_map_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return shared_cpumap_show_func(dev, false, buf);
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}
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static ssize_t shared_cpu_list_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return shared_cpumap_show_func(dev, true, buf);
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}
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static ssize_t type_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct cacheinfo *this_leaf = dev_get_drvdata(dev);
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switch (this_leaf->type) {
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case CACHE_TYPE_DATA:
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return sprintf(buf, "Data\n");
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case CACHE_TYPE_INST:
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return sprintf(buf, "Instruction\n");
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case CACHE_TYPE_UNIFIED:
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return sprintf(buf, "Unified\n");
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default:
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return -EINVAL;
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}
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}
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static ssize_t allocation_policy_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct cacheinfo *this_leaf = dev_get_drvdata(dev);
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unsigned int ci_attr = this_leaf->attributes;
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int n = 0;
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if ((ci_attr & CACHE_READ_ALLOCATE) && (ci_attr & CACHE_WRITE_ALLOCATE))
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n = sprintf(buf, "ReadWriteAllocate\n");
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else if (ci_attr & CACHE_READ_ALLOCATE)
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n = sprintf(buf, "ReadAllocate\n");
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else if (ci_attr & CACHE_WRITE_ALLOCATE)
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n = sprintf(buf, "WriteAllocate\n");
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return n;
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}
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static ssize_t write_policy_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct cacheinfo *this_leaf = dev_get_drvdata(dev);
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unsigned int ci_attr = this_leaf->attributes;
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int n = 0;
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if (ci_attr & CACHE_WRITE_THROUGH)
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n = sprintf(buf, "WriteThrough\n");
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else if (ci_attr & CACHE_WRITE_BACK)
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n = sprintf(buf, "WriteBack\n");
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return n;
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}
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static DEVICE_ATTR_RO(level);
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static DEVICE_ATTR_RO(type);
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static DEVICE_ATTR_RO(coherency_line_size);
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static DEVICE_ATTR_RO(ways_of_associativity);
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static DEVICE_ATTR_RO(number_of_sets);
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static DEVICE_ATTR_RO(size);
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static DEVICE_ATTR_RO(allocation_policy);
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static DEVICE_ATTR_RO(write_policy);
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static DEVICE_ATTR_RO(shared_cpu_map);
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static DEVICE_ATTR_RO(shared_cpu_list);
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static DEVICE_ATTR_RO(physical_line_partition);
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static struct attribute *cache_default_attrs[] = {
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&dev_attr_type.attr,
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&dev_attr_level.attr,
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&dev_attr_shared_cpu_map.attr,
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&dev_attr_shared_cpu_list.attr,
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&dev_attr_coherency_line_size.attr,
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&dev_attr_ways_of_associativity.attr,
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&dev_attr_number_of_sets.attr,
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&dev_attr_size.attr,
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&dev_attr_allocation_policy.attr,
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&dev_attr_write_policy.attr,
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&dev_attr_physical_line_partition.attr,
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NULL
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};
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static umode_t
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cache_default_attrs_is_visible(struct kobject *kobj,
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struct attribute *attr, int unused)
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{
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struct device *dev = kobj_to_dev(kobj);
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struct cacheinfo *this_leaf = dev_get_drvdata(dev);
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const struct cpumask *mask = &this_leaf->shared_cpu_map;
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umode_t mode = attr->mode;
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if ((attr == &dev_attr_type.attr) && this_leaf->type)
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return mode;
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if ((attr == &dev_attr_level.attr) && this_leaf->level)
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return mode;
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if ((attr == &dev_attr_shared_cpu_map.attr) && !cpumask_empty(mask))
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return mode;
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if ((attr == &dev_attr_shared_cpu_list.attr) && !cpumask_empty(mask))
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return mode;
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if ((attr == &dev_attr_coherency_line_size.attr) &&
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this_leaf->coherency_line_size)
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return mode;
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if ((attr == &dev_attr_ways_of_associativity.attr) &&
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this_leaf->size) /* allow 0 = full associativity */
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return mode;
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if ((attr == &dev_attr_number_of_sets.attr) &&
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this_leaf->number_of_sets)
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return mode;
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if ((attr == &dev_attr_size.attr) && this_leaf->size)
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return mode;
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if ((attr == &dev_attr_write_policy.attr) &&
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(this_leaf->attributes & CACHE_WRITE_POLICY_MASK))
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return mode;
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if ((attr == &dev_attr_allocation_policy.attr) &&
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(this_leaf->attributes & CACHE_ALLOCATE_POLICY_MASK))
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return mode;
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if ((attr == &dev_attr_physical_line_partition.attr) &&
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this_leaf->physical_line_partition)
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return mode;
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return 0;
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}
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static const struct attribute_group cache_default_group = {
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.attrs = cache_default_attrs,
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.is_visible = cache_default_attrs_is_visible,
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};
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static const struct attribute_group *cache_default_groups[] = {
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&cache_default_group,
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NULL,
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};
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static const struct attribute_group *cache_private_groups[] = {
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&cache_default_group,
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NULL, /* Place holder for private group */
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NULL,
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};
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const struct attribute_group *
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__weak cache_get_priv_group(struct cacheinfo *this_leaf)
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{
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return NULL;
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}
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static const struct attribute_group **
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cache_get_attribute_groups(struct cacheinfo *this_leaf)
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{
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const struct attribute_group *priv_group =
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cache_get_priv_group(this_leaf);
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if (!priv_group)
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return cache_default_groups;
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if (!cache_private_groups[1])
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cache_private_groups[1] = priv_group;
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return cache_private_groups;
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}
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/* Add/Remove cache interface for CPU device */
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static void cpu_cache_sysfs_exit(unsigned int cpu)
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{
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int i;
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struct device *ci_dev;
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if (per_cpu_index_dev(cpu)) {
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for (i = 0; i < cache_leaves(cpu); i++) {
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ci_dev = per_cache_index_dev(cpu, i);
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if (!ci_dev)
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continue;
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device_unregister(ci_dev);
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}
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kfree(per_cpu_index_dev(cpu));
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per_cpu_index_dev(cpu) = NULL;
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}
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device_unregister(per_cpu_cache_dev(cpu));
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per_cpu_cache_dev(cpu) = NULL;
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}
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static int cpu_cache_sysfs_init(unsigned int cpu)
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{
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struct device *dev = get_cpu_device(cpu);
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if (per_cpu_cacheinfo(cpu) == NULL)
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return -ENOENT;
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per_cpu_cache_dev(cpu) = cpu_device_create(dev, NULL, NULL, "cache");
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if (IS_ERR(per_cpu_cache_dev(cpu)))
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return PTR_ERR(per_cpu_cache_dev(cpu));
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/* Allocate all required memory */
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per_cpu_index_dev(cpu) = kcalloc(cache_leaves(cpu),
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sizeof(struct device *), GFP_KERNEL);
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if (unlikely(per_cpu_index_dev(cpu) == NULL))
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goto err_out;
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return 0;
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err_out:
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cpu_cache_sysfs_exit(cpu);
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|
return -ENOMEM;
|
|
}
|
|
|
|
static int cache_add_dev(unsigned int cpu)
|
|
{
|
|
unsigned int i;
|
|
int rc;
|
|
struct device *ci_dev, *parent;
|
|
struct cacheinfo *this_leaf;
|
|
struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
|
|
const struct attribute_group **cache_groups;
|
|
|
|
rc = cpu_cache_sysfs_init(cpu);
|
|
if (unlikely(rc < 0))
|
|
return rc;
|
|
|
|
parent = per_cpu_cache_dev(cpu);
|
|
for (i = 0; i < cache_leaves(cpu); i++) {
|
|
this_leaf = this_cpu_ci->info_list + i;
|
|
if (this_leaf->disable_sysfs)
|
|
continue;
|
|
cache_groups = cache_get_attribute_groups(this_leaf);
|
|
ci_dev = cpu_device_create(parent, this_leaf, cache_groups,
|
|
"index%1u", i);
|
|
if (IS_ERR(ci_dev)) {
|
|
rc = PTR_ERR(ci_dev);
|
|
goto err;
|
|
}
|
|
per_cache_index_dev(cpu, i) = ci_dev;
|
|
}
|
|
cpumask_set_cpu(cpu, &cache_dev_map);
|
|
|
|
return 0;
|
|
err:
|
|
cpu_cache_sysfs_exit(cpu);
|
|
return rc;
|
|
}
|
|
|
|
static void cache_remove_dev(unsigned int cpu)
|
|
{
|
|
if (!cpumask_test_cpu(cpu, &cache_dev_map))
|
|
return;
|
|
cpumask_clear_cpu(cpu, &cache_dev_map);
|
|
|
|
cpu_cache_sysfs_exit(cpu);
|
|
}
|
|
|
|
static int cacheinfo_cpu_callback(struct notifier_block *nfb,
|
|
unsigned long action, void *hcpu)
|
|
{
|
|
unsigned int cpu = (unsigned long)hcpu;
|
|
int rc = 0;
|
|
|
|
switch (action & ~CPU_TASKS_FROZEN) {
|
|
case CPU_ONLINE:
|
|
rc = detect_cache_attributes(cpu);
|
|
if (!rc)
|
|
rc = cache_add_dev(cpu);
|
|
break;
|
|
case CPU_DEAD:
|
|
cache_remove_dev(cpu);
|
|
free_cache_attributes(cpu);
|
|
break;
|
|
}
|
|
return notifier_from_errno(rc);
|
|
}
|
|
|
|
static int __init cacheinfo_sysfs_init(void)
|
|
{
|
|
int cpu, rc = 0;
|
|
|
|
cpu_notifier_register_begin();
|
|
|
|
for_each_online_cpu(cpu) {
|
|
rc = detect_cache_attributes(cpu);
|
|
if (rc)
|
|
goto out;
|
|
rc = cache_add_dev(cpu);
|
|
if (rc) {
|
|
free_cache_attributes(cpu);
|
|
pr_err("error populating cacheinfo..cpu%d\n", cpu);
|
|
goto out;
|
|
}
|
|
}
|
|
__hotcpu_notifier(cacheinfo_cpu_callback, 0);
|
|
|
|
out:
|
|
cpu_notifier_register_done();
|
|
return rc;
|
|
}
|
|
|
|
device_initcall(cacheinfo_sysfs_init);
|