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author | Aravinda Prasad <aravinda@linux.vnet.ibm.com> | 2018-10-16 17:20:05 +0530 |
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committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-10-20 13:26:47 +1100 |
commit | c6c26fb55e8e4b3fc376be5611685990a17de27a (patch) | |
tree | d9d5b0581b12f83365ffc9cd08402035f30146cb /arch/powerpc/platforms/pseries/lpar.c | |
parent | d2bf793237b3aa9c4275a466eef3893eef593691 (diff) | |
download | linux-stable-c6c26fb55e8e4b3fc376be5611685990a17de27a.tar.gz linux-stable-c6c26fb55e8e4b3fc376be5611685990a17de27a.tar.bz2 linux-stable-c6c26fb55e8e4b3fc376be5611685990a17de27a.zip |
powerpc/pseries: Export raw per-CPU VPA data via debugfs
This patch exports the raw per-CPU VPA data via debugfs.
A per-CPU file is created which exports the VPA data of
that CPU to help debug some of the VPA related issues or
to analyze the per-CPU VPA related statistics.
v3: Removed offline CPU check.
v2: Included offline CPU check and other review comments.
Signed-off-by: Aravinda Prasad <aravinda@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/platforms/pseries/lpar.c')
-rw-r--r-- | arch/powerpc/platforms/pseries/lpar.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c index 0b5081085a44..32d4452973e7 100644 --- a/arch/powerpc/platforms/pseries/lpar.c +++ b/arch/powerpc/platforms/pseries/lpar.c @@ -48,6 +48,7 @@ #include <asm/kexec.h> #include <asm/fadump.h> #include <asm/asm-prototypes.h> +#include <asm/debugfs.h> #include "pseries.h" @@ -1239,3 +1240,56 @@ static int __init reserve_vrma_context_id(void) return 0; } machine_device_initcall(pseries, reserve_vrma_context_id); + +#ifdef CONFIG_DEBUG_FS +/* debugfs file interface for vpa data */ +static ssize_t vpa_file_read(struct file *filp, char __user *buf, size_t len, + loff_t *pos) +{ + int cpu = (long)filp->private_data; + struct lppaca *lppaca = &lppaca_of(cpu); + + return simple_read_from_buffer(buf, len, pos, lppaca, + sizeof(struct lppaca)); +} + +static const struct file_operations vpa_fops = { + .open = simple_open, + .read = vpa_file_read, + .llseek = default_llseek, +}; + +static int __init vpa_debugfs_init(void) +{ + char name[16]; + long i; + static struct dentry *vpa_dir; + + if (!firmware_has_feature(FW_FEATURE_SPLPAR)) + return 0; + + vpa_dir = debugfs_create_dir("vpa", powerpc_debugfs_root); + if (!vpa_dir) { + pr_warn("%s: can't create vpa root dir\n", __func__); + return -ENOMEM; + } + + /* set up the per-cpu vpa file*/ + for_each_possible_cpu(i) { + struct dentry *d; + + sprintf(name, "cpu-%ld", i); + + d = debugfs_create_file(name, 0400, vpa_dir, (void *)i, + &vpa_fops); + if (!d) { + pr_warn("%s: can't create per-cpu vpa file\n", + __func__); + return -ENOMEM; + } + } + + return 0; +} +machine_arch_initcall(pseries, vpa_debugfs_init); +#endif /* CONFIG_DEBUG_FS */ |