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@xxxxxxxxxx> --- v2: * Use debugfs_create_ulong(): https://lore.kernel.org/linux-sgx/57c18e08-3e36-b5b3-aaba-9a21b75a1613@xxxxxxxxx/ 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(§ion->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
