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Message-Id: <20220930192254.971947-1-m.chetan.kumar@linux.intel.com>
Date: Sat, 1 Oct 2022 00:52:54 +0530
From: m.chetan.kumar@...ux.intel.com
To: netdev@...r.kernel.org
Cc: kuba@...nel.org, davem@...emloft.net, johannes@...solutions.net,
ryazanov.s.a@...il.com, loic.poulain@...aro.org,
krishna.c.sudi@...el.com, m.chetan.kumar@...ux.intel.com,
linuxwwan@...el.com, Moises Veleta <moises.veleta@...ux.intel.com>,
Devegowda Chandrashekar <chandrashekar.devegowda@...el.com>,
Ricardo Martinez <ricardo.martinez@...ux.intel.com>
Subject: [PATCH V2 net-next] net: wwan: t7xx: Add port for modem logging
From: Moises Veleta <moises.veleta@...ux.intel.com>
The Modem Logging (MDL) port provides an interface to collect modem
logs for debugging purposes. MDL is supported by the relay interface,
and the mtk_t7xx port infrastructure. MDL allows user-space apps to
control logging via mbim command and to collect logs via the relay
interface, while port infrastructure facilitates communication between
the driver and the modem.
Signed-off-by: Moises Veleta <moises.veleta@...ux.intel.com>
Signed-off-by: M Chetan Kumar <m.chetan.kumar@...ux.intel.com>
Signed-off-by: Devegowda Chandrashekar <chandrashekar.devegowda@...el.com>
Acked-by: Ricardo Martinez <ricardo.martinez@...ux.intel.com>
--
v2
* Removed debugfs control port.
* Initialize in Notify function upon handshake completion.
* Remove trace write function, MBIM will send commands.
---
drivers/net/wwan/Kconfig | 1 +
drivers/net/wwan/t7xx/Makefile | 3 +
drivers/net/wwan/t7xx/t7xx_hif_cldma.c | 2 +
drivers/net/wwan/t7xx/t7xx_port.h | 5 ++
drivers/net/wwan/t7xx/t7xx_port_proxy.c | 12 +++
drivers/net/wwan/t7xx/t7xx_port_proxy.h | 4 +
drivers/net/wwan/t7xx/t7xx_port_trace.c | 112 ++++++++++++++++++++++++
7 files changed, 139 insertions(+)
create mode 100644 drivers/net/wwan/t7xx/t7xx_port_trace.c
diff --git a/drivers/net/wwan/Kconfig b/drivers/net/wwan/Kconfig
index 3486ffe94ac4..32149029c891 100644
--- a/drivers/net/wwan/Kconfig
+++ b/drivers/net/wwan/Kconfig
@@ -108,6 +108,7 @@ config IOSM
config MTK_T7XX
tristate "MediaTek PCIe 5G WWAN modem T7xx device"
depends on PCI
+ select RELAY if WWAN_DEBUGFS
help
Enables MediaTek PCIe based 5G WWAN modem (T7xx series) device.
Adapts WWAN framework and provides network interface like wwan0
diff --git a/drivers/net/wwan/t7xx/Makefile b/drivers/net/wwan/t7xx/Makefile
index dc6a7d682c15..268ff9e87e5b 100644
--- a/drivers/net/wwan/t7xx/Makefile
+++ b/drivers/net/wwan/t7xx/Makefile
@@ -18,3 +18,6 @@ mtk_t7xx-y:= t7xx_pci.o \
t7xx_hif_dpmaif_rx.o \
t7xx_dpmaif.o \
t7xx_netdev.o
+
+mtk_t7xx-$(CONFIG_WWAN_DEBUGFS) += \
+ t7xx_port_trace.o \
diff --git a/drivers/net/wwan/t7xx/t7xx_hif_cldma.c b/drivers/net/wwan/t7xx/t7xx_hif_cldma.c
index 6ff30cb8eb16..aec3a18d44bd 100644
--- a/drivers/net/wwan/t7xx/t7xx_hif_cldma.c
+++ b/drivers/net/wwan/t7xx/t7xx_hif_cldma.c
@@ -1018,6 +1018,8 @@ static int t7xx_cldma_late_init(struct cldma_ctrl *md_ctrl)
dev_err(md_ctrl->dev, "control TX ring init fail\n");
goto err_free_tx_ring;
}
+
+ md_ctrl->tx_ring[i].pkt_size = CLDMA_MTU;
}
for (j = 0; j < CLDMA_RXQ_NUM; j++) {
diff --git a/drivers/net/wwan/t7xx/t7xx_port.h b/drivers/net/wwan/t7xx/t7xx_port.h
index dc4133eb433a..702e7aa2ef31 100644
--- a/drivers/net/wwan/t7xx/t7xx_port.h
+++ b/drivers/net/wwan/t7xx/t7xx_port.h
@@ -122,6 +122,11 @@ struct t7xx_port {
int rx_length_th;
bool chan_enable;
struct task_struct *thread;
+#ifdef CONFIG_WWAN_DEBUGFS
+ void *relaych;
+ struct dentry *debugfs_dir;
+ struct dentry *debugfs_wwan_dir;
+#endif
};
struct sk_buff *t7xx_port_alloc_skb(int payload);
diff --git a/drivers/net/wwan/t7xx/t7xx_port_proxy.c b/drivers/net/wwan/t7xx/t7xx_port_proxy.c
index d4de047ff0d4..894b1d11b2c9 100644
--- a/drivers/net/wwan/t7xx/t7xx_port_proxy.c
+++ b/drivers/net/wwan/t7xx/t7xx_port_proxy.c
@@ -70,6 +70,18 @@ static const struct t7xx_port_conf t7xx_md_port_conf[] = {
.name = "MBIM",
.port_type = WWAN_PORT_MBIM,
}, {
+#ifdef CONFIG_WWAN_DEBUGFS
+ .tx_ch = PORT_CH_MD_LOG_TX,
+ .rx_ch = PORT_CH_MD_LOG_RX,
+ .txq_index = 7,
+ .rxq_index = 7,
+ .txq_exp_index = 7,
+ .rxq_exp_index = 7,
+ .path_id = CLDMA_ID_MD,
+ .ops = &t7xx_trace_port_ops,
+ .name = "mdlog",
+ }, {
+#endif
.tx_ch = PORT_CH_CONTROL_TX,
.rx_ch = PORT_CH_CONTROL_RX,
.txq_index = Q_IDX_CTRL,
diff --git a/drivers/net/wwan/t7xx/t7xx_port_proxy.h b/drivers/net/wwan/t7xx/t7xx_port_proxy.h
index bc1ff5c6c700..81d059fbc0fb 100644
--- a/drivers/net/wwan/t7xx/t7xx_port_proxy.h
+++ b/drivers/net/wwan/t7xx/t7xx_port_proxy.h
@@ -87,6 +87,10 @@ struct ctrl_msg_header {
extern struct port_ops wwan_sub_port_ops;
extern struct port_ops ctl_port_ops;
+#ifdef CONFIG_WWAN_DEBUGFS
+extern struct port_ops t7xx_trace_port_ops;
+#endif
+
void t7xx_port_proxy_reset(struct port_proxy *port_prox);
void t7xx_port_proxy_uninit(struct port_proxy *port_prox);
int t7xx_port_proxy_init(struct t7xx_modem *md);
diff --git a/drivers/net/wwan/t7xx/t7xx_port_trace.c b/drivers/net/wwan/t7xx/t7xx_port_trace.c
new file mode 100644
index 000000000000..b02cd547d8ea
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_port_trace.c
@@ -0,0 +1,112 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2022 Intel Corporation.
+ */
+
+#include <linux/debugfs.h>
+#include <linux/relay.h>
+#include <linux/skbuff.h>
+#include <linux/wwan.h>
+
+#include "t7xx_port.h"
+#include "t7xx_port_proxy.h"
+#include "t7xx_state_monitor.h"
+
+#define T7XX_TRC_SUB_BUFF_SIZE 131072
+#define T7XX_TRC_N_SUB_BUFF 32
+
+static struct dentry *t7xx_trace_create_buf_file_handler(const char *filename,
+ struct dentry *parent,
+ umode_t mode,
+ struct rchan_buf *buf,
+ int *is_global)
+{
+ *is_global = 1;
+ return debugfs_create_file(filename, mode, parent, buf,
+ &relay_file_operations);
+}
+
+static int t7xx_trace_remove_buf_file_handler(struct dentry *dentry)
+{
+ debugfs_remove(dentry);
+ return 0;
+}
+
+static int t7xx_trace_subbuf_start_handler(struct rchan_buf *buf, void *subbuf,
+ void *prev_subbuf, size_t prev_padding)
+{
+ if (relay_buf_full(buf)) {
+ pr_err_ratelimited("Relay_buf full dropping traces");
+ return 0;
+ }
+
+ return 1;
+}
+
+static struct rchan_callbacks relay_callbacks = {
+ .subbuf_start = t7xx_trace_subbuf_start_handler,
+ .create_buf_file = t7xx_trace_create_buf_file_handler,
+ .remove_buf_file = t7xx_trace_remove_buf_file_handler,
+};
+
+static void t7xx_trace_port_uninit(struct t7xx_port *port)
+{
+ struct rchan *relaych = port->relaych;
+
+ if (!relaych)
+ return;
+
+ relay_close(relaych);
+ debugfs_remove_recursive(port->debugfs_dir);
+ wwan_put_debugfs_dir(port->debugfs_wwan_dir);
+}
+
+static int t7xx_trace_port_recv_skb(struct t7xx_port *port, struct sk_buff *skb)
+{
+ struct rchan *relaych = port->relaych;
+
+ if (!relaych)
+ return -EINVAL;
+
+ relay_write(relaych, skb->data, skb->len);
+ dev_kfree_skb(skb);
+ return 0;
+}
+
+static void t7xx_port_trace_md_state_notify(struct t7xx_port *port, unsigned int state)
+{
+ struct rchan *relaych;
+
+ if (state != MD_STATE_READY || port->relaych)
+ return;
+
+ port->debugfs_wwan_dir = wwan_get_debugfs_dir(port->dev);
+ if (IS_ERR(port->debugfs_wwan_dir))
+ port->debugfs_wwan_dir = NULL;
+
+ port->debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, port->debugfs_wwan_dir);
+ if (IS_ERR_OR_NULL(port->debugfs_dir)) {
+ wwan_put_debugfs_dir(port->debugfs_wwan_dir);
+ dev_err(port->dev, "Unable to create debugfs for trace");
+ return;
+ }
+
+ relaych = relay_open("relay_ch", port->debugfs_dir, T7XX_TRC_SUB_BUFF_SIZE,
+ T7XX_TRC_N_SUB_BUFF, &relay_callbacks, NULL);
+ if (!relaych)
+ goto err_rm_debugfs_dir;
+
+ port->relaych = relaych;
+ return;
+
+err_rm_debugfs_dir:
+ debugfs_remove_recursive(port->debugfs_dir);
+ wwan_put_debugfs_dir(port->debugfs_wwan_dir);
+ dev_err(port->dev, "Unable to create trace port %s", port->port_conf->name);
+}
+
+struct port_ops t7xx_trace_port_ops = {
+ .recv_skb = t7xx_trace_port_recv_skb,
+ .uninit = t7xx_trace_port_uninit,
+ .md_state_notify = t7xx_port_trace_md_state_notify,
+};
--
2.34.1
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