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Message-Id: <20210401052114.697432-2-jarkko@kernel.org>
Date: Thu, 1 Apr 2021 08:21:14 +0300
From: Jarkko Sakkinen <jarkko@...nel.org>
To: linux-sgx@...r.kernel.org
Cc: Jarkko Sakkinen <jarkko@...nel.org>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] x86/sgx: Add sgx_nr_{all, free}_pages to the debugfs
Add two debugs attributes:
* /sys/kernel/debug/x86/sgx_nr_all_pages
* /sys/kernel/debug/x86/sgx_nr_free_pages
These provide useful statistics for testing purposes.
E.g. on a NUC7CJYH2, when no enclaves are running, and EPC set to 32 MB:
$ sudo cat /sys/kernel/debug/x86/sgx_nr_all_pages
5632
$ sudo cat /sys/kernel/debug/x86/sgx_nr_free_pages
5632
Signed-off-by: Jarkko Sakkinen <jarkko@...nel.org>
---
arch/x86/kernel/cpu/sgx/main.c | 53 +++++++++++++++++++++++++++++++++-
1 file changed, 52 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c
index 7df7048cb1c9..190c96735c9f 100644
--- a/arch/x86/kernel/cpu/sgx/main.c
+++ b/arch/x86/kernel/cpu/sgx/main.c
@@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2016-20 Intel Corporation. */
+#include <linux/debugfs.h>
#include <linux/freezer.h>
#include <linux/highmem.h>
#include <linux/kthread.h>
@@ -25,7 +26,10 @@ static DECLARE_WAIT_QUEUE_HEAD(ksgxd_waitq);
static LIST_HEAD(sgx_active_page_list);
static DEFINE_SPINLOCK(sgx_reclaimer_lock);
-/* The free page list lock protected variables prepend the lock. */
+/* The number of EPC pages in total in all nodes. */
+static unsigned long sgx_nr_all_pages;
+
+/* The number of free EPC pages in all nodes. */
static unsigned long sgx_nr_free_pages;
/* Nodes with one or more EPC sections. */
@@ -657,6 +661,8 @@ static bool __init sgx_setup_epc_section(u64 phys_addr, u64 size,
list_add_tail(§ion->pages[i].list, &sgx_dirty_page_list);
}
+ sgx_nr_all_pages += nr_pages;
+
return true;
}
@@ -730,6 +736,44 @@ static bool __init sgx_page_cache_init(void)
return true;
}
+#ifdef CONFIG_DEBUG_FS
+static ssize_t sgx_nr_all_pages_read(struct file *file, char __user *user_buf,
+ size_t count, loff_t *pos)
+{
+ char kernel_buf[32];
+ int len;
+
+ len = snprintf(kernel_buf, sizeof(kernel_buf), "%lu\n", sgx_nr_all_pages);
+ if (len < 0)
+ return len;
+
+ return simple_read_from_buffer(user_buf, count, pos, kernel_buf, len);
+}
+
+static const struct file_operations sgx_nr_all_pages_fops = {
+ .read = sgx_nr_all_pages_read,
+ .llseek = default_llseek,
+};
+
+static ssize_t sgx_nr_free_pages_read(struct file *file, char __user *user_buf,
+ size_t count, loff_t *pos)
+{
+ char kernel_buf[32];
+ int len;
+
+ len = snprintf(kernel_buf, sizeof(kernel_buf), "%lu\n", sgx_nr_free_pages);
+ if (len < 0)
+ return len;
+
+ return simple_read_from_buffer(user_buf, count, pos, kernel_buf, len);
+}
+
+static const struct file_operations sgx_nr_free_pages_fops = {
+ .read = sgx_nr_free_pages_read,
+ .llseek = default_llseek,
+};
+#endif /* CONFIG_DEBUG_FS */
+
static int __init sgx_init(void)
{
int ret;
@@ -750,6 +794,13 @@ static int __init sgx_init(void)
if (ret)
goto err_kthread;
+#ifdef CONFIG_DEBUG_FS
+ debugfs_create_file("sgx_nr_all_pages", 0400, arch_debugfs_dir, NULL,
+ &sgx_nr_all_pages_fops);
+ debugfs_create_file("sgx_nr_free_pages", 0400, arch_debugfs_dir, NULL,
+ &sgx_nr_free_pages_fops);
+#endif /* CONFIG_DEBUG_FS */
+
return 0;
err_kthread:
--
2.31.1
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