@@ -172,3 +172,17 @@ config SCSI_UFS_EXYNOS
Select this if you have UFS host controller on EXYNOS chipset.
If unsure, say N.
+
+config SCSI_UFS_EXYNOS_CMD_LOG
+ bool "EXYNOS specific command log"
+ default n
+ depends on SCSI_UFS_EXYNOS
+ help
+ This selects EXYNOS specific functions to get and even print
+ some information to see what's happening at both command
+ issue time completion time.
+ The information may contain gerernal things as well as
+ EXYNOS specific, such as vendor specific hardware contexts.
+
+ Select this if you want to get and print the information.
+ If unsure, say N.
@@ -4,7 +4,7 @@ obj-$(CONFIG_SCSI_UFS_DWC_TC_PCI) += tc-dwc-g210-pci.o ufshcd-dwc.o tc-dwc-g210.
obj-$(CONFIG_SCSI_UFS_DWC_TC_PLATFORM) += tc-dwc-g210-pltfrm.o ufshcd-dwc.o tc-dwc-g210.o
obj-$(CONFIG_SCSI_UFS_CDNS_PLATFORM) += cdns-pltfrm.o
obj-$(CONFIG_SCSI_UFS_QCOM) += ufs-qcom.o
-obj-$(CONFIG_SCSI_UFS_EXYNOS) += ufs-exynos.o
+obj-$(CONFIG_SCSI_UFS_EXYNOS) += ufs-exynos.o ufs-exynos-dbg.o
obj-$(CONFIG_SCSI_UFSHCD) += ufshcd-core.o
ufshcd-core-y += ufshcd.o ufs-sysfs.o
ufshcd-core-$(CONFIG_SCSI_UFS_BSG) += ufs_bsg.o
new file mode 100644
@@ -0,0 +1,202 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * UFS Exynos debugging functions
+ *
+ * Copyright (C) 2020 Samsung Electronics Co., Ltd.
+ * Author: Kiwoong Kim <kwmad.kim@samsung.com>
+ *
+ */
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include "ufshcd.h"
+#include "ufs-exynos.h"
+#include "ufs-exynos-if.h"
+
+#define MAX_CMD_LOGS 32
+
+struct cmd_data {
+ unsigned int tag;
+ unsigned int sct;
+ u64 lba;
+ u64 start_time;
+ u64 end_time;
+ u64 outstanding_reqs;
+ int retries;
+ u8 op;
+};
+
+struct ufs_cmd_info {
+ u32 total;
+ u32 last;
+ struct cmd_data data[MAX_CMD_LOGS];
+ struct cmd_data *pdata[MAX_CMD_LOGS];
+};
+
+/*
+ * This structure points out several contexts on debugging
+ * per one host instant.
+ * Now command history exists in here but later handle may
+ * contains some mmio base addresses including vendor specific
+ * regions to get hardware contexts.
+ */
+struct ufs_s_dbg_mgr {
+ struct ufs_exynos_handle *handle;
+ int active;
+ u64 first_time;
+ u64 time;
+
+ /* cmd log */
+ struct ufs_cmd_info cmd_info;
+ struct cmd_data cmd_log; /* temp buffer to put */
+ spinlock_t cmd_lock;
+};
+
+static void ufs_s_print_cmd_log(struct ufs_s_dbg_mgr *mgr, struct device *dev)
+{
+ struct ufs_cmd_info *cmd_info = &mgr->cmd_info;
+ struct cmd_data *data = cmd_info->data;
+ u32 i;
+ u32 last;
+ u32 max = MAX_CMD_LOGS;
+ unsigned long flags;
+ u32 total;
+
+ spin_lock_irqsave(&mgr->cmd_lock, flags);
+ total = cmd_info->total;
+ if (cmd_info->total < max)
+ max = cmd_info->total;
+ last = (cmd_info->last + MAX_CMD_LOGS - 1) % MAX_CMD_LOGS;
+ spin_unlock_irqrestore(&mgr->cmd_lock, flags);
+
+ dev_err(dev, ":---------------------------------------------------\n");
+ dev_err(dev, ":\t\tSCSI CMD(%u)\n", total - 1);
+ dev_err(dev, ":---------------------------------------------------\n");
+ dev_err(dev, ":OP, TAG, LBA, SCT, RETRIES, STIME, ETIME, REQS\n\n");
+
+ for (i = 0 ; i < max ; i++, data++) {
+ dev_err(dev, ": 0x%02x, %02d, 0x%08llx, 0x%04x, %d, %llu, %llu, 0x%llx %s",
+ data->op, data->tag, data->lba, data->sct, data->retries,
+ data->start_time, data->end_time, data->outstanding_reqs,
+ ((last == i) ? "<--" : " "));
+ if (last == i)
+ dev_err(dev, "\n");
+ }
+}
+
+static void ufs_s_put_cmd_log(struct ufs_s_dbg_mgr *mgr,
+ struct cmd_data *cmd_data)
+{
+ struct ufs_cmd_info *cmd_info = &mgr->cmd_info;
+ unsigned long flags;
+ struct cmd_data *pdata;
+
+ spin_lock_irqsave(&mgr->cmd_lock, flags);
+ pdata = &cmd_info->data[cmd_info->last];
+ ++cmd_info->total;
+ ++cmd_info->last;
+ cmd_info->last = cmd_info->last % MAX_CMD_LOGS;
+ spin_unlock_irqrestore(&mgr->cmd_lock, flags);
+
+ pdata->op = cmd_data->op;
+ pdata->tag = cmd_data->tag;
+ pdata->lba = cmd_data->lba;
+ pdata->sct = cmd_data->sct;
+ pdata->retries = cmd_data->retries;
+ pdata->start_time = cmd_data->start_time;
+ pdata->end_time = 0;
+ pdata->outstanding_reqs = cmd_data->outstanding_reqs;
+ cmd_info->pdata[cmd_data->tag] = pdata;
+}
+
+/*
+ * EXTERNAL FUNCTIONS
+ *
+ * There are two classes that are to initialize data structures for debug
+ * and to define actual behavior.
+ */
+void exynos_ufs_dump_info(struct ufs_exynos_handle *handle, struct device *dev)
+{
+ struct ufs_s_dbg_mgr *mgr = (struct ufs_s_dbg_mgr *)handle->private;
+
+ if (mgr->active == 0)
+ goto out;
+
+ mgr->time = cpu_clock(raw_smp_processor_id());
+
+#ifdef CONFIG_SCSI_UFS_EXYNOS_CMD_LOG
+ ufs_s_print_cmd_log(mgr, dev);
+#endif
+
+ if (mgr->first_time == 0ULL)
+ mgr->first_time = mgr->time;
+out:
+ return;
+}
+
+void exynos_ufs_cmd_log_start(struct ufs_exynos_handle *handle,
+ struct ufs_hba *hba, struct scsi_cmnd *cmd)
+{
+ struct ufs_s_dbg_mgr *mgr = (struct ufs_s_dbg_mgr *)handle->private;
+ int cpu = raw_smp_processor_id();
+ struct cmd_data *cmd_log = &mgr->cmd_log; /* temp buffer to put */
+ u64 lba = (cmd->cmnd[2] << 24) |
+ (cmd->cmnd[3] << 16) |
+ (cmd->cmnd[4] << 8) |
+ (cmd->cmnd[5] << 0);
+ unsigned int sct = (cmd->cmnd[7] << 8) |
+ (cmd->cmnd[8] << 0);
+
+ if (mgr->active == 0)
+ return;
+
+ cmd_log->start_time = cpu_clock(cpu);
+ cmd_log->op = cmd->cmnd[0];
+ cmd_log->tag = cmd->request->tag;
+
+ /* This function runtime is protected by spinlock from outside */
+ cmd_log->outstanding_reqs = hba->outstanding_reqs;
+
+ /* unmap */
+ if (cmd->cmnd[0] != UNMAP)
+ cmd_log->lba = lba;
+
+ cmd_log->sct = sct;
+ cmd_log->retries = cmd->allowed;
+
+ ufs_s_put_cmd_log(mgr, cmd_log);
+}
+
+void exynos_ufs_cmd_log_end(struct ufs_exynos_handle *handle,
+ struct ufs_hba *hba, struct scsi_cmnd *cmd)
+{
+ struct ufs_s_dbg_mgr *mgr = (struct ufs_s_dbg_mgr *)handle->private;
+ struct ufs_cmd_info *cmd_info = &mgr->cmd_info;
+ int cpu = raw_smp_processor_id();
+ int tag = cmd->request->tag;
+
+ if (mgr->active == 0)
+ return;
+
+ cmd_info->pdata[tag]->end_time = cpu_clock(cpu);
+}
+
+int exynos_ufs_init_dbg(struct ufs_exynos_handle *handle, struct device *dev)
+{
+ struct ufs_s_dbg_mgr *mgr;
+
+ mgr = devm_kzalloc(dev, sizeof(struct ufs_s_dbg_mgr), GFP_KERNEL);
+ if (!mgr)
+ return -ENOMEM;
+ handle->private = (void *)mgr;
+ mgr->handle = handle;
+ mgr->active = 1;
+
+ /* cmd log */
+ spin_lock_init(&mgr->cmd_lock);
+
+ return 0;
+}
+MODULE_AUTHOR("Kiwoong Kim <kwmad.kim@samsung.com>");
+MODULE_DESCRIPTION("Exynos UFS debug information");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("0.1");
new file mode 100644
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * UFS Exynos debugging functions
+ *
+ * Copyright (C) 2020 Samsung Electronics Co., Ltd.
+ * Author: Kiwoong Kim <kwmad.kim@samsung.com>
+ *
+ */
+#ifndef _UFS_EXYNOS_IF_H_
+#define _UFS_EXYNOS_IF_H_
+
+/* more members would be added in the future */
+struct ufs_exynos_handle {
+ void *private;
+};
+
+#endif /* _UFS_EXYNOS_IF_H_ */
@@ -700,12 +700,31 @@ static int exynos_ufs_post_pwr_mode(struct ufs_hba *hba,
return 0;
}
+#ifdef CONFIG_SCSI_UFS_EXYNOS_CMD_LOG
+static void exynos_ufs_cmd_log(struct ufs_hba *hba,
+ struct scsi_cmnd *cmd, int enter)
+{
+ struct exynos_ufs *ufs = ufshcd_get_variant(hba);
+ struct ufs_exynos_handle *handle = ufs->handle;
+
+ if (enter == 1)
+ exynos_ufs_cmd_log_start(handle, hba, cmd);
+ else if (enter == 2)
+ exynos_ufs_cmd_log_end(handle, hba, cmd);
+}
+#endif
+
static void exynos_ufs_specify_nexus_t_xfer_req(struct ufs_hba *hba,
int tag, bool op)
{
struct exynos_ufs *ufs = ufshcd_get_variant(hba);
u32 type;
+#ifdef CONFIG_SCSI_UFS_EXYNOS_CMD_LOG
+ struct scsi_cmnd *cmd = hba->lrb[tag].cmd;
+ if (op)
+ exynos_ufs_cmd_log(hba, cmd, 1);
+#endif
type = hci_readl(ufs, HCI_UTRL_NEXUS_TYPE);
if (op)
@@ -714,8 +733,7 @@ static void exynos_ufs_specify_nexus_t_xfer_req(struct ufs_hba *hba,
hci_writel(ufs, type & ~(1 << tag), HCI_UTRL_NEXUS_TYPE);
}
-static void exynos_ufs_specify_nexus_t_tm_req(struct ufs_hba *hba,
- int tag, u8 func)
+static void exynos_ufs_specify_nexus_t_tm_req(struct ufs_hba *hba, int tag, u8 func)
{
struct exynos_ufs *ufs = ufshcd_get_variant(hba);
u32 type;
@@ -1008,6 +1026,12 @@ static int exynos_ufs_init(struct ufs_hba *hba)
goto out;
exynos_ufs_specify_phy_time_attr(ufs);
exynos_ufs_config_smu(ufs);
+
+ /* init dbg */
+ ret = exynos_ufs_init_dbg(ufs->handle, dev);
+ if (ret)
+ return ret;
+ spin_lock_init(&ufs->dbg_lock);
return 0;
phy_off:
@@ -1210,6 +1234,39 @@ static int exynos_ufs_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
return 0;
}
+static void exynos_ufs_dbg_register_dump(struct ufs_hba *hba)
+{
+ struct exynos_ufs *ufs = ufshcd_get_variant(hba);
+ unsigned long flags;
+
+ spin_lock_irqsave(&ufs->dbg_lock, flags);
+ if (ufs->under_dump == 0)
+ ufs->under_dump = 1;
+ else {
+ spin_unlock_irqrestore(&ufs->dbg_lock, flags);
+ goto out;
+ }
+ spin_unlock_irqrestore(&ufs->dbg_lock, flags);
+
+ exynos_ufs_dump_info(ufs->handle, hba->dev);
+
+ spin_lock_irqsave(&ufs->dbg_lock, flags);
+ ufs->under_dump = 0;
+ spin_unlock_irqrestore(&ufs->dbg_lock, flags);
+out:
+ return;
+}
+
+static void exynos_ufs_compl_xfer_req(struct ufs_hba *hba, int tag, bool op)
+{
+#ifdef CONFIG_SCSI_UFS_EXYNOS_CMD_LOG
+ struct scsi_cmnd *cmd = hba->lrb[tag].cmd;
+
+ if (op)
+ exynos_ufs_cmd_log(hba, cmd, 2);
+#endif
+}
+
static struct ufs_hba_variant_ops ufs_hba_exynos_ops = {
.name = "exynos_ufs",
.init = exynos_ufs_init,
@@ -1221,6 +1278,8 @@ static struct ufs_hba_variant_ops ufs_hba_exynos_ops = {
.hibern8_notify = exynos_ufs_hibern8_notify,
.suspend = exynos_ufs_suspend,
.resume = exynos_ufs_resume,
+ .dbg_register_dump = exynos_ufs_dbg_register_dump,
+ .compl_xfer_req = exynos_ufs_compl_xfer_req,
};
static int exynos_ufs_probe(struct platform_device *pdev)
@@ -8,6 +8,7 @@
#ifndef _UFS_EXYNOS_H_
#define _UFS_EXYNOS_H_
+#include "ufs-exynos-if.h"
/*
* UNIPRO registers
@@ -212,6 +213,10 @@ struct exynos_ufs {
#define EXYNOS_UFS_OPT_BROKEN_AUTO_CLK_CTRL BIT(2)
#define EXYNOS_UFS_OPT_BROKEN_RX_SEL_IDX BIT(3)
#define EXYNOS_UFS_OPT_USE_SW_HIBERN8_TIMER BIT(4)
+
+ struct ufs_exynos_handle *handle;
+ spinlock_t dbg_lock;
+ int under_dump;
};
#define for_each_ufs_rx_lane(ufs, i) \
@@ -284,4 +289,12 @@ struct exynos_ufs_uic_attr exynos7_uic_attr = {
.rx_hs_g3_prep_sync_len_cap = PREP_LEN(0xf),
.pa_dbg_option_suite = 0x30103,
};
+
+/* public function declarations */
+void exynos_ufs_dump_info(struct ufs_exynos_handle *handle, struct device *dev);
+void exynos_ufs_cmd_log_start(struct ufs_exynos_handle *handle,
+ struct ufs_hba *hba, struct scsi_cmnd *cmd);
+void exynos_ufs_cmd_log_end(struct ufs_exynos_handle *handle,
+ struct ufs_hba *hba, struct scsi_cmnd *cmd);
+int exynos_ufs_init_dbg(struct ufs_exynos_handle *handle, struct device *dev);
#endif /* _UFS_EXYNOS_H_ */
This patch implements callbacks dbg_register_dump and compl_xfer_req to store IO contexts or print them. This includes functions to record contexts of incoming commands in a circular queue. ufshcd.c has already some function tracer calls to get command history but ftrace would be gone when system dies before you get the information, such as panic cases. When you turn on CONFIG_SCSI_UFS_EXYNOS_CMD_LOG, information in the circular queue whenever ufshcd.c invokes a dbg_register_dump callback. Signed-off-by: Kiwoong Kim <kwmad.kim@samsung.com> --- drivers/scsi/ufs/Kconfig | 14 +++ drivers/scsi/ufs/Makefile | 2 +- drivers/scsi/ufs/ufs-exynos-dbg.c | 202 ++++++++++++++++++++++++++++++++++++++ drivers/scsi/ufs/ufs-exynos-if.h | 17 ++++ drivers/scsi/ufs/ufs-exynos.c | 63 +++++++++++- drivers/scsi/ufs/ufs-exynos.h | 13 +++ 6 files changed, 308 insertions(+), 3 deletions(-) create mode 100644 drivers/scsi/ufs/ufs-exynos-dbg.c create mode 100644 drivers/scsi/ufs/ufs-exynos-if.h