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iommu/vt-d: Expose latency monitor data through debugfs 

A debugfs interface /sys/kernel/debug/iommu/intel/dmar_perf_latency is
created to control and show counts of execution time ranges for various
types per DMAR. The interface may help debug any potential performance
issue.

By default, the interface is disabled.

Possible write value of /sys/kernel/debug/iommu/intel/dmar_perf_latency
  0 - disable sampling all latency data
  1 - enable sampling IOTLB invalidation latency data
  2 - enable sampling devTLB invalidation latency data
  3 - enable sampling intr entry cache invalidation latency data
  4 - enable sampling prq handling latency data

Read /sys/kernel/debug/iommu/intel/dmar_perf_latency gives a snapshot
of sampling result of all enabled monitors.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20210520031531.712333-1-baolu.lu@linux.intel.com
Link: https://lore.kernel.org/r/20210610020115.1637656-15-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Lu Baolu 2021-06-10 10:01:06 +08:00 committed by Joerg Roedel
parent 55ee5e67a5
commit 456bb0b97f
2 changed files with 112 additions and 0 deletions
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1
drivers/iommu/intel/Kconfig
View File

@ -28,6 +28,7 @@ config INTEL_IOMMU
config INTEL_IOMMU_DEBUGFS
bool "Export Intel IOMMU internals in Debugfs"
depends on INTEL_IOMMU && IOMMU_DEBUGFS
select DMAR_PERF
help
!!!WARNING!!!

111
drivers/iommu/intel/debugfs.c
View File

@ -16,6 +16,7 @@
#include <asm/irq_remapping.h>
#include "pasid.h"
#include "perf.h"
struct tbl_walk {
u16 bus;
@ -31,6 +32,9 @@ struct iommu_regset {
const char *regs;
};
#define DEBUG_BUFFER_SIZE 1024
static char debug_buf[DEBUG_BUFFER_SIZE];
#define IOMMU_REGSET_ENTRY(_reg_) \
{ DMAR_##_reg_##_REG, __stringify(_reg_) }
@ -538,6 +542,111 @@ static int ir_translation_struct_show(struct seq_file *m, void *unused)
DEFINE_SHOW_ATTRIBUTE(ir_translation_struct);
#endif
static void latency_show_one(struct seq_file *m, struct intel_iommu *iommu,
struct dmar_drhd_unit *drhd)
{
int ret;
seq_printf(m, "IOMMU: %s Register Base Address: %llx\n",
iommu->name, drhd->reg_base_addr);
ret = dmar_latency_snapshot(iommu, debug_buf, DEBUG_BUFFER_SIZE);
if (ret < 0)
seq_puts(m, "Failed to get latency snapshot");
else
seq_puts(m, debug_buf);
seq_puts(m, "\n");
}
static int latency_show(struct seq_file *m, void *v)
{
struct dmar_drhd_unit *drhd;
struct intel_iommu *iommu;
rcu_read_lock();
for_each_active_iommu(iommu, drhd)
latency_show_one(m, iommu, drhd);
rcu_read_unlock();
return 0;
}
static int dmar_perf_latency_open(struct inode *inode, struct file *filp)
{
return single_open(filp, latency_show, NULL);
}
static ssize_t dmar_perf_latency_write(struct file *filp,
const char __user *ubuf,
size_t cnt, loff_t *ppos)
{
struct dmar_drhd_unit *drhd;
struct intel_iommu *iommu;
int counting;
char buf[64];
if (cnt > 63)
cnt = 63;
if (copy_from_user(&buf, ubuf, cnt))
return -EFAULT;
buf[cnt] = 0;
if (kstrtoint(buf, 0, &counting))
return -EINVAL;
switch (counting) {
case 0:
rcu_read_lock();
for_each_active_iommu(iommu, drhd) {
dmar_latency_disable(iommu, DMAR_LATENCY_INV_IOTLB);
dmar_latency_disable(iommu, DMAR_LATENCY_INV_DEVTLB);
dmar_latency_disable(iommu, DMAR_LATENCY_INV_IEC);
dmar_latency_disable(iommu, DMAR_LATENCY_PRQ);
}
rcu_read_unlock();
break;
case 1:
rcu_read_lock();
for_each_active_iommu(iommu, drhd)
dmar_latency_enable(iommu, DMAR_LATENCY_INV_IOTLB);
rcu_read_unlock();
break;
case 2:
rcu_read_lock();
for_each_active_iommu(iommu, drhd)
dmar_latency_enable(iommu, DMAR_LATENCY_INV_DEVTLB);
rcu_read_unlock();
break;
case 3:
rcu_read_lock();
for_each_active_iommu(iommu, drhd)
dmar_latency_enable(iommu, DMAR_LATENCY_INV_IEC);
rcu_read_unlock();
break;
case 4:
rcu_read_lock();
for_each_active_iommu(iommu, drhd)
dmar_latency_enable(iommu, DMAR_LATENCY_PRQ);
rcu_read_unlock();
break;
default:
return -EINVAL;
}
*ppos += cnt;
return cnt;
}
static const struct file_operations dmar_perf_latency_fops = {
.open = dmar_perf_latency_open,
.write = dmar_perf_latency_write,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
void __init intel_iommu_debugfs_init(void)
{
struct dentry *intel_iommu_debug = debugfs_create_dir("intel",
@ -556,4 +665,6 @@ void __init intel_iommu_debugfs_init(void)
debugfs_create_file("ir_translation_struct", 0444, intel_iommu_debug,
NULL, &ir_translation_struct_fops);
#endif
debugfs_create_file("dmar_perf_latency", 0644, intel_iommu_debug,
NULL, &dmar_perf_latency_fops);
}