qcacld-3.0: Add node to sysfs to print wlan mem usage

The wlan_mem_stats node will print the DMA, SKB and heap
memory allocated in the wlan host driver. This is applicable
to perf and defconfig builds.
File path to new node is:
/sys/kernel/wifi/wlan/wlan_mem_stats

Change-Id: Ic05423d362de1ef07a3ecbdd6408a7226e2a3c2f
CRs-Fixed: 2680360

Kbuild

@@ -279,6 +279,9 @@ endif
 ifeq ($(CONFIG_FEATURE_UNIT_TEST_SUSPEND), y)
 HDD_OBJS += $(HDD_SRC_DIR)/wlan_hdd_sysfs_suspend_resume.o
 endif
+ifeq ($(CONFIG_WLAN_SYSFS_MEM_STATS), y)
+HDD_OBJS += $(HDD_SRC_DIR)/wlan_hdd_sysfs_mem_stats.o
+endif
 HDD_OBJS += $(HDD_SRC_DIR)/wlan_hdd_sysfs_unit_test.o
 HDD_OBJS += $(HDD_SRC_DIR)/wlan_hdd_sysfs_modify_acl.o
 ifeq ($(CONFIG_WLAN_SYSFS_CONNECT_INFO), y)
@@ -2613,6 +2616,7 @@ cppflags-$(CONFIG_WLAN_GET_TEMP) += -DCONFIG_WLAN_GET_TEMP
 cppflags-$(CONFIG_WLAN_THERMAL_CFG) += -DCONFIG_WLAN_THERMAL_CFG
 cppflags-$(CONFIG_FEATURE_UNIT_TEST_SUSPEND) += -DWLAN_SUSPEND_RESUME_TEST
 cppflags-$(CONFIG_FEATURE_WLM_STATS) += -DFEATURE_WLM_STATS
+cppflags-$(CONFIG_WLAN_SYSFS_MEM_STATS) += -DCONFIG_WLAN_SYSFS_MEM_STATS
 cppflags-$(CONFIG_WLAN_SYSFS_DCM) += -DWLAN_SYSFS_DCM
 cppflags-$(CONFIG_WLAN_SYSFS_HE_BSS_COLOR) += -DWLAN_SYSFS_HE_BSS_COLOR
 cppflags-$(CONFIG_WLAN_SYSFS_GET_STA_INFO) += -DWLAN_SYSFS_GET_STA_INFO

configs/default_defconfig

@@ -178,6 +178,7 @@ ifeq ($(CONFIG_WLAN_SYSFS), y)
 	CONFIG_WLAN_SYSFS_GET_STA_INFO := y
 	CONFIG_WLAN_SYSFS_GET_CHANNEL := y
 	CONFIG_WLAN_SET_FW_MODE_CFG := y
+	CONFIG_WLAN_SYSFS_MEM_STATS := y
 	CONFIG_WLAN_REASSOC := y
 	CONFIG_WLAN_SYSFS_CONNECT_INFO := y
 	CONFIG_WLAN_SCAN_DISABLE := y

core/hdd/src/wlan_hdd_sysfs.c

@@ -41,6 +41,7 @@
 #include "wlan_hdd_sysfs_get_channel.h"
 #include <wlan_hdd_sysfs_set_fw_mode_cfg.h>
 #include <wlan_hdd_sysfs_reassoc.h>
+#include <wlan_hdd_sysfs_mem_stats.h>
 #include "wlan_hdd_sysfs_crash_inject.h"
 #include "wlan_hdd_sysfs_suspend_resume.h"
 #include "wlan_hdd_sysfs_unit_test.h"
@@ -767,6 +768,7 @@ void hdd_create_sysfs_files(struct hdd_context *hdd_ctx)
 {
 	hdd_sysfs_create_driver_root_obj();
 	hdd_sysfs_create_version_interface(hdd_ctx->psoc);
+	hdd_sysfs_mem_stats_create(wlan_kobject);
 	if  (QDF_GLOBAL_MISSION_MODE == hdd_get_conparam()) {
 		hdd_sysfs_create_powerstats_interface();
 		hdd_sysfs_set_fw_mode_cfg_create(driver_kobject);
@@ -799,6 +801,7 @@ void hdd_destroy_sysfs_files(void)
 		hdd_sysfs_set_fw_mode_cfg_destroy(driver_kobject);
 		hdd_sysfs_destroy_powerstats_interface();
 	}
+	hdd_sysfs_mem_stats_destroy(wlan_kobject);
 	hdd_sysfs_destroy_version_interface();
 	hdd_sysfs_destroy_driver_root_obj();
 }

core/hdd/src/wlan_hdd_sysfs_mem_stats.c

@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2020 The Linux Foundation. All rights reserved.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for
+ * any purpose with or without fee is hereby granted, provided that the
+ * above copyright notice and this permission notice appear in all
+ * copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
+ * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
+ * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/**
+ *  DOC: wlan_hdd_sysfs_mem_stats.c
+ *
+ *  Implementation to add sysfs node wlan_mem_stats
+ *
+ */
+
+#include <wlan_hdd_includes.h>
+#include "osif_psoc_sync.h"
+#include <wlan_hdd_sysfs.h>
+#include <qdf_mem.h>
+#include <wlan_hdd_sysfs_mem_stats.h>
+
+static ssize_t __hdd_wlan_mem_stats_show(char *buf)
+{
+	return scnprintf(buf, PAGE_SIZE,
+			 "DMA = %u | Kmalloc = %u | SKB = %u\n",
+			 qdf_dma_mem_stats_read(),
+			 qdf_heap_mem_stats_read(),
+			 qdf_skb_mem_stats_read());
+}
+
+static ssize_t hdd_wlan_mem_stats_show(struct kobject *kobj,
+				       struct kobj_attribute *attr,
+				       char *buf)
+{
+	struct hdd_context *hdd_ctx = cds_get_context(QDF_MODULE_ID_HDD);
+	struct osif_psoc_sync *psoc_sync;
+	ssize_t length;
+	int errno;
+
+	errno = wlan_hdd_validate_context(hdd_ctx);
+	if (errno)
+		return errno;
+
+	errno = osif_psoc_sync_op_start(hdd_ctx->parent_dev, &psoc_sync);
+	if (errno)
+		return errno;
+
+	length = __hdd_wlan_mem_stats_show(buf);
+
+	osif_psoc_sync_op_stop(psoc_sync);
+
+	return length;
+}
+
+static struct kobj_attribute mem_stats_attribute =
+	__ATTR(wlan_mem_stats, 0440, hdd_wlan_mem_stats_show, NULL);
+
+int hdd_sysfs_mem_stats_create(struct kobject *wlan_kobject)
+{
+	int error;
+
+	if (!wlan_kobject) {
+		hdd_err("Could not get wlan kobject!");
+		return -EINVAL;
+	}
+	error = sysfs_create_file(wlan_kobject, &mem_stats_attribute.attr);
+	if (error)
+		hdd_err("Failed to create sysfs file wlan_mem_stats");
+
+	return error;
+}
+
+void hdd_sysfs_mem_stats_destroy(struct kobject *wlan_kobject)
+{
+	if (!wlan_kobject)
+		hdd_err("Could not get wlan kobject!");
+	sysfs_remove_file(wlan_kobject, &mem_stats_attribute.attr);
+}
+

core/hdd/src/wlan_hdd_sysfs_mem_stats.h

@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2020 The Linux Foundation. All rights reserved.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for
+ * any purpose with or without fee is hereby granted, provided that the
+ * above copyright notice and this permission notice appear in all
+ * copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
+ * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
+ * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/**
+ * DOC: wlan_hdd_sysfs_mem_stats.h
+ *
+ * Implementation to add sysfs node wlan_mem_stats
+ */
+
+#ifndef _WLAN_HDD_SYSFS_MEM_STATS
+#define _WLAN_HDD_SYSFS_MEM_STATS
+
+#if defined(WLAN_SYSFS) && defined(CONFIG_WLAN_SYSFS_MEM_STATS)
+/**
+ * hdd_sysfs_mem_stats_create() - Function to create
+ * wlan_mem_stats sysfs node to capture host driver memory usage
+ * @wlan_kobject: sysfs wlan kobject
+ *
+ * file path: /sys/kernel/wifi/wlan/wlan_mem_stats
+ *
+ * usage: cat /sys/kernel/wifi/wlan/wlan_mem_stats
+ *
+ * Return: 0 on success and errno on failure
+ */
+int hdd_sysfs_mem_stats_create(struct kobject *wlan_kobject);
+
+/**
+ * hdd_sysfs_mem_stats_destroy() - API to destroy
+ * wlan_mem_stats
+ *
+ * Return: none
+ */
+void hdd_sysfs_mem_stats_destroy(struct kobject *wlan_kobject);
+#else
+static inline int
+hdd_sysfs_mem_stats_create(struct kobject *wlan_kobject)
+{
+	return 0;
+}
+
+static inline void
+hdd_sysfs_mem_stats_destroy(struct kobject *wlan_kobject)
+{
+}
+#endif /* WLAN_SYSFS && CONFIG_WLAN_SYSFS_MEM_STATS */
+#endif /* _WLAN_HDD_SYSFS_MEM_STATS */
+