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Subject[PATCH v2 2/2] x86/sgx: Add sgx_nr_{all, free}_pages to the debugfs
Date
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@kernel.org>
---

v2:
* Use debugfs_create_ulong():
https://lore.kernel.org/linux-sgx/57c18e08-3e36-b5b3-aaba-9a21b75a1613@intel.com/

arch/x86/kernel/cpu/sgx/main.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c
index 7df7048cb1c9..07bad864c531 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(&section->pages[i].list, &sgx_dirty_page_list);
}

+ sgx_nr_all_pages += nr_pages;
+
return true;
}

@@ -750,6 +756,11 @@ static int __init sgx_init(void)
if (ret)
goto err_kthread;

+#ifdef CONFIG_DEBUG_FS
+ debugfs_create_ulong("sgx_nr_all_pages", 0400, arch_debugfs_dir, NULL, &sgx_nr_all_pages);
+ debugfs_create_ulong("sgx_nr_free_pages", 0400, arch_debugfs_dir, NULL, &sgx_nr_free_pages);
+#endif /* CONFIG_DEBUG_FS */
+
return 0;

err_kthread:
--
2.31.1
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