1 files changed, 439 insertions, 0 deletions

diff --git a/drivers/staging/ccree/ssi_sysfs.c b/drivers/staging/ccree/ssi_sysfs.c
new file mode 100644
index 0000000..7c514c1
--- /dev/null
+++ b/drivers/staging/ccree/ssi_sysfs.c
@@ -0,0 +1,439 @@
+/*
+ * Copyright (C) 2012-2017 ARM Limited or its affiliates.
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include "ssi_config.h"
+#include "ssi_driver.h"
+#include "cc_crypto_ctx.h"
+#include "ssi_sysfs.h"
+
+#ifdef ENABLE_CC_SYSFS
+
+static struct ssi_drvdata *sys_get_drvdata(void);
+
+#ifdef CC_CYCLE_COUNT
+
+#include <asm/timex.h>
+
+struct stat_item {
+	unsigned int min;
+	unsigned int max;
+	cycles_t sum;
+	unsigned int count;
+};
+
+struct stat_name {
+	const char *op_type_name;
+	const char *stat_phase_name[MAX_STAT_PHASES];
+};
+
+static struct stat_name stat_name_db[MAX_STAT_OP_TYPES] = 
+{
+	{
+		/* STAT_OP_TYPE_NULL */
+		.op_type_name = "NULL",
+		.stat_phase_name = {NULL},
+	},
+	{
+		.op_type_name = "Encode",
+		.stat_phase_name[STAT_PHASE_0] = "Init and sanity checks",
+		.stat_phase_name[STAT_PHASE_1] = "Map buffers", 
+		.stat_phase_name[STAT_PHASE_2] = "Create sequence", 
+		.stat_phase_name[STAT_PHASE_3] = "Send Request",
+		.stat_phase_name[STAT_PHASE_4] = "HW-Q push",
+		.stat_phase_name[STAT_PHASE_5] = "Sequence completion",
+		.stat_phase_name[STAT_PHASE_6] = "HW cycles",
+	},
+	{	.op_type_name = "Decode",
+		.stat_phase_name[STAT_PHASE_0] = "Init and sanity checks",
+		.stat_phase_name[STAT_PHASE_1] = "Map buffers", 
+		.stat_phase_name[STAT_PHASE_2] = "Create sequence", 
+		.stat_phase_name[STAT_PHASE_3] = "Send Request",
+		.stat_phase_name[STAT_PHASE_4] = "HW-Q push",
+		.stat_phase_name[STAT_PHASE_5] = "Sequence completion",
+		.stat_phase_name[STAT_PHASE_6] = "HW cycles",
+	},
+	{ 	.op_type_name = "Setkey",
+		.stat_phase_name[STAT_PHASE_0] = "Init and sanity checks",
+		.stat_phase_name[STAT_PHASE_1] = "Copy key to ctx",
+		.stat_phase_name[STAT_PHASE_2] = "Create sequence",
+		.stat_phase_name[STAT_PHASE_3] = "Send Request",
+		.stat_phase_name[STAT_PHASE_4] = "HW-Q push",
+		.stat_phase_name[STAT_PHASE_5] = "Sequence completion",
+		.stat_phase_name[STAT_PHASE_6] = "HW cycles",
+	},
+	{
+		.op_type_name = "Generic",
+		.stat_phase_name[STAT_PHASE_0] = "Interrupt",
+		.stat_phase_name[STAT_PHASE_1] = "ISR-to-Tasklet",
+		.stat_phase_name[STAT_PHASE_2] = "Tasklet start-to-end",
+		.stat_phase_name[STAT_PHASE_3] = "Tasklet:user_cb()",
+		.stat_phase_name[STAT_PHASE_4] = "Tasklet:dx_X_complete() - w/o X_complete()",
+		.stat_phase_name[STAT_PHASE_5] = "",
+		.stat_phase_name[STAT_PHASE_6] = "HW cycles",
+	}
+};
+
+/*
+ * Structure used to create a directory 
+ * and its attributes in sysfs.
+ */
+struct sys_dir {
+	struct kobject *sys_dir_kobj;
+	struct attribute_group sys_dir_attr_group;
+	struct attribute **sys_dir_attr_list;
+	uint32_t num_of_attrs;
+	struct ssi_drvdata *drvdata; /* Associated driver context */
+};
+
+/* top level directory structures */
+struct sys_dir sys_top_dir;
+
+static DEFINE_SPINLOCK(stat_lock);
+
+/* List of DBs */
+static struct stat_item stat_host_db[MAX_STAT_OP_TYPES][MAX_STAT_PHASES];
+static struct stat_item stat_cc_db[MAX_STAT_OP_TYPES][MAX_STAT_PHASES];
+
+
+static void init_db(struct stat_item item[MAX_STAT_OP_TYPES][MAX_STAT_PHASES])
+{
+	unsigned int i, j;
+
+	/* Clear db */
+	for (i=0; i<MAX_STAT_OP_TYPES; i++) {
+		for (j=0; j<MAX_STAT_PHASES; j++) {
+			item[i][j].min = 0xFFFFFFFF;
+			item[i][j].max = 0;
+			item[i][j].sum = 0;
+			item[i][j].count = 0;
+		}
+	}
+}
+
+static void update_db(struct stat_item *item, unsigned int result)
+{
+	item->count++;
+	item->sum += result;
+	if (result < item->min)
+		item->min = result;
+	if (result > item->max )
+		item->max = result;
+}
+
+static void display_db(struct stat_item item[MAX_STAT_OP_TYPES][MAX_STAT_PHASES])
+{
+	unsigned int i, j;
+	uint64_t avg;
+
+	for (i=STAT_OP_TYPE_ENCODE; i<MAX_STAT_OP_TYPES; i++) {
+		for (j=0; j<MAX_STAT_PHASES; j++) {	
+			if (item[i][j].count > 0) {
+				avg = (uint64_t)item[i][j].sum;
+				do_div(avg, item[i][j].count);
+				SSI_LOG_ERR("%s, %s: min=%d avg=%d max=%d sum=%lld count=%d\n", 
+					stat_name_db[i].op_type_name, stat_name_db[i].stat_phase_name[j], 
+					item[i][j].min, (int)avg, item[i][j].max, (long long)item[i][j].sum, item[i][j].count);
+			}
+		}
+	}
+}
+
+
+/**************************************
+ * Attributes show functions section  *
+ **************************************/
+
+static ssize_t ssi_sys_stats_host_db_clear(struct kobject *kobj,
+	struct kobj_attribute *attr, const char *buf, size_t count)
+{
+	init_db(stat_host_db);
+	return count;
+}
+
+static ssize_t ssi_sys_stats_cc_db_clear(struct kobject *kobj,
+	struct kobj_attribute *attr, const char *buf, size_t count)
+{
+	init_db(stat_cc_db);
+	return count;
+}
+
+static ssize_t ssi_sys_stat_host_db_show(struct kobject *kobj,
+		struct kobj_attribute *attr, char *buf)
+{
+	int i, j ;
+	char line[512];
+	uint32_t min_cyc, max_cyc;
+	uint64_t avg;
+	ssize_t buf_len, tmp_len=0;
+
+	buf_len = scnprintf(buf,PAGE_SIZE,
+		"phase\t\t\t\t\t\t\tmin[cy]\tavg[cy]\tmax[cy]\t#samples\n");
+	if ( buf_len <0 )/* scnprintf shouldn't return negative value according to its implementation*/
+		return buf_len;
+	for (i=STAT_OP_TYPE_ENCODE; i<MAX_STAT_OP_TYPES; i++) {
+		for (j=0; j<MAX_STAT_PHASES-1; j++) {
+			if (stat_host_db[i][j].count > 0) {
+				avg = (uint64_t)stat_host_db[i][j].sum;
+				do_div(avg, stat_host_db[i][j].count);
+				min_cyc = stat_host_db[i][j].min;
+				max_cyc = stat_host_db[i][j].max;
+			} else {
+				avg = min_cyc = max_cyc = 0;
+			}
+			tmp_len = scnprintf(line,512,
+				"%s::%s\t\t\t\t\t%6u\t%6u\t%6u\t%7u\n",
+				stat_name_db[i].op_type_name,
+				stat_name_db[i].stat_phase_name[j],
+				min_cyc, (unsigned int)avg, max_cyc,
+				stat_host_db[i][j].count);
+			if ( tmp_len <0 )/* scnprintf shouldn't return negative value according to its implementation*/
+				return buf_len;
+			if ( buf_len + tmp_len >= PAGE_SIZE)
+				return buf_len;
+			buf_len += tmp_len;
+			strncat(buf, line,512);
+		}
+	}
+	return buf_len;
+}
+
+static ssize_t ssi_sys_stat_cc_db_show(struct kobject *kobj,
+		struct kobj_attribute *attr, char *buf)
+{
+	int i;
+	char line[256];
+	uint32_t min_cyc, max_cyc;
+	uint64_t avg;
+	ssize_t buf_len,tmp_len=0;
+
+	buf_len = scnprintf(buf,PAGE_SIZE,
+		"phase\tmin[cy]\tavg[cy]\tmax[cy]\t#samples\n");
+	if ( buf_len <0 )/* scnprintf shouldn't return negative value according to its implementation*/
+		return buf_len;
+	for (i=STAT_OP_TYPE_ENCODE; i<MAX_STAT_OP_TYPES; i++) {
+		if (stat_cc_db[i][STAT_PHASE_6].count > 0) {
+			avg = (uint64_t)stat_cc_db[i][STAT_PHASE_6].sum;
+			do_div(avg, stat_cc_db[i][STAT_PHASE_6].count);
+			min_cyc = stat_cc_db[i][STAT_PHASE_6].min;
+			max_cyc = stat_cc_db[i][STAT_PHASE_6].max;
+		} else {
+			avg = min_cyc = max_cyc = 0;
+		}
+		tmp_len = scnprintf(line,256,
+			"%s\t%6u\t%6u\t%6u\t%7u\n",
+			stat_name_db[i].op_type_name,
+			min_cyc,
+			(unsigned int)avg,
+			max_cyc,
+			stat_cc_db[i][STAT_PHASE_6].count);
+
+		if ( tmp_len < 0 )/* scnprintf shouldn't return negative value according to its implementation*/
+			return buf_len;
+
+		if ( buf_len + tmp_len >= PAGE_SIZE)
+			return buf_len;
+		buf_len += tmp_len;
+		strncat(buf, line,256);
+	}
+	return buf_len;
+}
+
+void update_host_stat(unsigned int op_type, unsigned int phase, cycles_t result)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&stat_lock, flags);
+	update_db(&(stat_host_db[op_type][phase]), (unsigned int)result);
+	spin_unlock_irqrestore(&stat_lock, flags);
+}
+
+void update_cc_stat(
+	unsigned int op_type,
+	unsigned int phase,
+	unsigned int elapsed_cycles)
+{
+	update_db(&(stat_cc_db[op_type][phase]), elapsed_cycles);
+}
+
+void display_all_stat_db(void)
+{
+	SSI_LOG_ERR("\n=======    CYCLE COUNT STATS    =======\n"); 
+	display_db(stat_host_db);
+	SSI_LOG_ERR("\n======= CC HW CYCLE COUNT STATS =======\n"); 
+	display_db(stat_cc_db);
+}
+#endif /*CC_CYCLE_COUNT*/
+
+
+
+static ssize_t ssi_sys_regdump_show(struct kobject *kobj,
+		struct kobj_attribute *attr, char *buf)
+{
+	struct ssi_drvdata *drvdata = sys_get_drvdata();
+	uint32_t register_value;
+	void __iomem* cc_base = drvdata->cc_base;
+	int offset = 0;
+
+	register_value = CC_HAL_READ_REGISTER(CC_REG_OFFSET(HOST_RGF, HOST_SIGNATURE));
+	offset += scnprintf(buf + offset, PAGE_SIZE - offset, "%s \t(0x%lX)\t 0x%08X  \n", "HOST_SIGNATURE       ", DX_HOST_SIGNATURE_REG_OFFSET, register_value);
+	register_value = CC_HAL_READ_REGISTER(CC_REG_OFFSET(HOST_RGF, HOST_IRR));
+	offset += scnprintf(buf + offset, PAGE_SIZE - offset, "%s \t(0x%lX)\t 0x%08X  \n", "HOST_IRR             ", DX_HOST_IRR_REG_OFFSET, register_value);
+	register_value = CC_HAL_READ_REGISTER(CC_REG_OFFSET(HOST_RGF, HOST_POWER_DOWN_EN));
+	offset += scnprintf(buf + offset, PAGE_SIZE - offset, "%s \t(0x%lX)\t 0x%08X  \n", "HOST_POWER_DOWN_EN   ", DX_HOST_POWER_DOWN_EN_REG_OFFSET, register_value);
+	register_value =  CC_HAL_READ_REGISTER(CC_REG_OFFSET(CRY_KERNEL, AXIM_MON_ERR));
+	offset += scnprintf(buf + offset, PAGE_SIZE - offset, "%s \t(0x%lX)\t 0x%08X  \n", "AXIM_MON_ERR         ", DX_AXIM_MON_ERR_REG_OFFSET, register_value);
+	register_value = CC_HAL_READ_REGISTER(CC_REG_OFFSET(CRY_KERNEL, DSCRPTR_QUEUE_CONTENT));
+	offset += scnprintf(buf + offset, PAGE_SIZE - offset, "%s \t(0x%lX)\t 0x%08X  \n", "DSCRPTR_QUEUE_CONTENT", DX_DSCRPTR_QUEUE_CONTENT_REG_OFFSET, register_value);
+	return offset;
+}
+
+static ssize_t ssi_sys_help_show(struct kobject *kobj,
+		struct kobj_attribute *attr, char *buf)
+{
+	char* help_str[]={
+				"cat reg_dump              ", "Print several of CC register values",
+		#if defined CC_CYCLE_COUNT
+				"cat stats_host            ", "Print host statistics",
+				"echo <number> > stats_host", "Clear host statistics database",
+				"cat stats_cc              ", "Print CC statistics",
+				"echo <number> > stats_cc  ", "Clear CC statistics database",
+		#endif
+				};
+	int i=0, offset = 0;
+
+	offset += scnprintf(buf + offset, PAGE_SIZE - offset, "Usage:\n");
+	for ( i = 0; i < ARRAY_SIZE(help_str); i+=2) {
+	   offset += scnprintf(buf + offset, PAGE_SIZE - offset, "%s\t\t%s\n", help_str[i], help_str[i+1]);
+	}
+	return offset;
+}
+
+/********************************************************
+ *		SYSFS objects				*
+ ********************************************************/
+/*
+ * Structure used to create a directory
+ * and its attributes in sysfs.
+ */
+struct sys_dir {
+	struct kobject *sys_dir_kobj;
+	struct attribute_group sys_dir_attr_group;
+	struct attribute **sys_dir_attr_list;
+	uint32_t num_of_attrs;
+	struct ssi_drvdata *drvdata; /* Associated driver context */
+};
+
+/* top level directory structures */
+static struct sys_dir sys_top_dir;
+
+/* TOP LEVEL ATTRIBUTES */
+static struct kobj_attribute ssi_sys_top_level_attrs[] = {
+	__ATTR(dump_regs, 0444, ssi_sys_regdump_show, NULL),
+	__ATTR(help, 0444, ssi_sys_help_show, NULL),
+#if defined CC_CYCLE_COUNT
+	__ATTR(stats_host, 0664, ssi_sys_stat_host_db_show, ssi_sys_stats_host_db_clear),
+	__ATTR(stats_cc, 0664, ssi_sys_stat_cc_db_show, ssi_sys_stats_cc_db_clear),
+#endif
+
+};
+
+static struct ssi_drvdata *sys_get_drvdata(void)
+{
+	/* TODO: supporting multiple SeP devices would require avoiding
+	 * global "top_dir" and finding associated "top_dir" by traversing
+	 * up the tree to the kobject which matches one of the top_dir's */
+	return sys_top_dir.drvdata;
+}
+
+static int sys_init_dir(struct sys_dir *sys_dir, struct ssi_drvdata *drvdata,
+		 struct kobject *parent_dir_kobj, const char *dir_name,
+		 struct kobj_attribute *attrs, uint32_t num_of_attrs)
+{
+	int i;
+
+	memset(sys_dir, 0, sizeof(struct sys_dir));
+
+	sys_dir->drvdata = drvdata;
+
+	/* initialize directory kobject */
+	sys_dir->sys_dir_kobj =
+		kobject_create_and_add(dir_name, parent_dir_kobj);
+
+	if (!(sys_dir->sys_dir_kobj))
+		return -ENOMEM;
+	/* allocate memory for directory's attributes list */
+	sys_dir->sys_dir_attr_list =
+		kzalloc(sizeof(struct attribute *) * (num_of_attrs + 1),
+				GFP_KERNEL);
+
+	if (!(sys_dir->sys_dir_attr_list)) {
+		kobject_put(sys_dir->sys_dir_kobj);
+		return -ENOMEM;
+	}
+
+	sys_dir->num_of_attrs = num_of_attrs;
+
+	/* initialize attributes list */
+	for (i = 0; i < num_of_attrs; ++i)
+		sys_dir->sys_dir_attr_list[i] = &(attrs[i].attr);
+
+	/* last list entry should be NULL */
+	sys_dir->sys_dir_attr_list[num_of_attrs] = NULL;
+
+	sys_dir->sys_dir_attr_group.attrs = sys_dir->sys_dir_attr_list;
+
+	return sysfs_create_group(sys_dir->sys_dir_kobj,
+			&(sys_dir->sys_dir_attr_group));
+}
+
+static void sys_free_dir(struct sys_dir *sys_dir)
+{
+	if (!sys_dir)
+		return;
+
+	kfree(sys_dir->sys_dir_attr_list);
+
+	if (sys_dir->sys_dir_kobj != NULL)
+		kobject_put(sys_dir->sys_dir_kobj);
+}
+
+int ssi_sysfs_init(struct kobject *sys_dev_obj, struct ssi_drvdata *drvdata)
+{
+	int retval;
+
+#if defined CC_CYCLE_COUNT
+	/* Init. statistics */
+	init_db(stat_host_db);
+	init_db(stat_cc_db);
+#endif
+
+	SSI_LOG_ERR("setup sysfs under %s\n", sys_dev_obj->name);
+
+	/* Initialize top directory */
+	retval = sys_init_dir(&sys_top_dir, drvdata, sys_dev_obj,
+				"cc_info", ssi_sys_top_level_attrs,
+				ARRAY_SIZE(ssi_sys_top_level_attrs));
+	return retval;
+}
+
+void ssi_sysfs_fini(void)
+{
+	sys_free_dir(&sys_top_dir);
+}
+
+#endif /*ENABLE_CC_SYSFS*/
+