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Message-ID: <1556402706-176271-11-git-send-email-dragan.cvetic@xilinx.com>
Date: Sat, 27 Apr 2019 23:05:04 +0100
From: Dragan Cvetic <dragan.cvetic@...inx.com>
To: <arnd@...db.de>, <gregkh@...uxfoundation.org>,
<michal.simek@...inx.com>, <linux-arm-kernel@...ts.infradead.org>,
<robh+dt@...nel.org>, <mark.rutland@....com>,
<devicetree@...r.kernel.org>
CC: <linux-kernel@...r.kernel.org>,
Dragan Cvetic <dragan.cvetic@...inx.com>,
Derek Kiernan <derek.kiernan@...inx.com>
Subject: [PATCH V3 10/12] misc: xilinx_sdfec: Add stats & status ioctls
SD-FEC statistic data are:
- count of data interface errors (isr_err_count)
- count of Correctable ECC errors (cecc_count)
- count of Uncorrectable ECC errors (uecc_count)
Add support:
1. clear stats ioctl callback which clears collected
statistic data,
2. get stats ioctl callback which reads a collected
statistic data,
3. set default configuration ioctl callback,
4. start ioctl callback enables SD-FEC HW,
5. stop ioctl callback disables SD-FEC HW.
In a failed state driver enables the following ioctls:
- get status
- get statistics
- clear stats
- set default SD-FEC device configuration
Tested-by: Santhosh Dyavanapally <SDYAVANA@...inx.com>
Tested by: Punnaiah Choudary Kalluri <punnaia@...inx.com>
Tested-by: Derek Kiernan <derek.kiernan@...inx.com>
Tested-by: Dragan Cvetic <dragan.cvetic@...inx.com>
Signed-off-by: Derek Kiernan <derek.kiernan@...inx.com>
Signed-off-by: Dragan Cvetic <dragan.cvetic@...inx.com>
---
drivers/misc/xilinx_sdfec.c | 123 +++++++++++++++++++++++++++++++++++++++
include/uapi/misc/xilinx_sdfec.h | 75 ++++++++++++++++++++++++
2 files changed, 198 insertions(+)
diff --git a/drivers/misc/xilinx_sdfec.c b/drivers/misc/xilinx_sdfec.c
index 32b2e2d..317c5c4 100644
--- a/drivers/misc/xilinx_sdfec.c
+++ b/drivers/misc/xilinx_sdfec.c
@@ -203,6 +203,7 @@ struct xsdfec_clks {
* @dev: pointer to device struct
* @state: State of the SDFEC device
* @config: Configuration of the SDFEC device
+ * @intr_enabled: indicates IRQ enabled
* @state_updated: indicates State updated by interrupt handler
* @stats_updated: indicates Stats updated by interrupt handler
* @isr_err_count: Count of ISR errors
@@ -222,6 +223,7 @@ struct xsdfec_dev {
struct device *dev;
enum xsdfec_state state;
struct xsdfec_config config;
+ bool intr_enabled;
bool state_updated;
bool stats_updated;
atomic_t isr_err_count;
@@ -320,6 +322,26 @@ static int xsdfec_dev_release(struct inode *iptr, struct file *fptr)
return 0;
}
+static int xsdfec_get_status(struct xsdfec_dev *xsdfec, void __user *arg)
+{
+ struct xsdfec_status status;
+ int err;
+
+ status.fec_id = xsdfec->config.fec_id;
+ spin_lock_irq(&xsdfec->irq_lock);
+ status.state = xsdfec->state;
+ xsdfec->state_updated = false;
+ spin_unlock_irq(&xsdfec->irq_lock);
+ status.activity = (xsdfec_regread(xsdfec, XSDFEC_ACTIVE_ADDR) &
+ XSDFEC_IS_ACTIVITY_SET);
+
+ err = copy_to_user(arg, &status, sizeof(status));
+ if (err)
+ err = -EFAULT;
+
+ return err;
+}
+
static int xsdfec_get_config(struct xsdfec_dev *xsdfec, void __user *arg)
{
int err;
@@ -896,6 +918,80 @@ static int xsdfec_cfg_axi_streams(struct xsdfec_dev *xsdfec)
return 0;
}
+static int xsdfec_start(struct xsdfec_dev *xsdfec)
+{
+ u32 regread;
+
+ regread = xsdfec_regread(xsdfec, XSDFEC_FEC_CODE_ADDR);
+ regread &= 0x1;
+ if (regread != xsdfec->config.code) {
+ dev_err(xsdfec->dev,
+ "%s SDFEC HW code does not match driver code, reg %d, code %d",
+ __func__, regread, xsdfec->config.code);
+ return -EINVAL;
+ }
+
+ /* Set AXIS enable */
+ xsdfec_regwrite(xsdfec, XSDFEC_AXIS_ENABLE_ADDR,
+ XSDFEC_AXIS_ENABLE_MASK);
+ /* Done */
+ xsdfec->state = XSDFEC_STARTED;
+ return 0;
+}
+
+static int xsdfec_stop(struct xsdfec_dev *xsdfec)
+{
+ u32 regread;
+
+ if (xsdfec->state != XSDFEC_STARTED)
+ dev_err(xsdfec->dev, "Device not started correctly");
+ /* Disable AXIS_ENABLE Input interfaces only */
+ regread = xsdfec_regread(xsdfec, XSDFEC_AXIS_ENABLE_ADDR);
+ regread &= (~XSDFEC_AXIS_IN_ENABLE_MASK);
+ xsdfec_regwrite(xsdfec, XSDFEC_AXIS_ENABLE_ADDR, regread);
+ /* Stop */
+ xsdfec->state = XSDFEC_STOPPED;
+ return 0;
+}
+
+static int xsdfec_clear_stats(struct xsdfec_dev *xsdfec)
+{
+ atomic_set(&xsdfec->isr_err_count, 0);
+ atomic_set(&xsdfec->uecc_count, 0);
+ atomic_set(&xsdfec->cecc_count, 0);
+
+ return 0;
+}
+
+static int xsdfec_get_stats(struct xsdfec_dev *xsdfec, void __user *arg)
+{
+ int err;
+ struct xsdfec_stats user_stats;
+
+ spin_lock_irq(&xsdfec->irq_lock);
+ user_stats.isr_err_count = atomic_read(&xsdfec->isr_err_count);
+ user_stats.cecc_count = atomic_read(&xsdfec->cecc_count);
+ user_stats.uecc_count = atomic_read(&xsdfec->uecc_count);
+ xsdfec->stats_updated = false;
+ spin_unlock_irq(&xsdfec->irq_lock);
+
+ err = copy_to_user(arg, &user_stats, sizeof(user_stats));
+ if (err)
+ err = -EFAULT;
+
+ return err;
+}
+
+static int xsdfec_set_default_config(struct xsdfec_dev *xsdfec)
+{
+ /* Ensure registers are aligned with core configuration */
+ xsdfec_regwrite(xsdfec, XSDFEC_FEC_CODE_ADDR, xsdfec->config.code);
+ xsdfec_cfg_axi_streams(xsdfec);
+ update_config_from_hw(xsdfec);
+
+ return 0;
+}
+
static long xsdfec_dev_ioctl(struct file *fptr, unsigned int cmd,
unsigned long data)
{
@@ -907,6 +1003,15 @@ static long xsdfec_dev_ioctl(struct file *fptr, unsigned int cmd,
if (!xsdfec)
return rval;
+ /* In failed state allow only reset and get status IOCTLs */
+ if (xsdfec->state == XSDFEC_NEEDS_RESET &&
+ (cmd != XSDFEC_SET_DEFAULT_CONFIG && cmd != XSDFEC_GET_STATUS &&
+ cmd != XSDFEC_GET_STATS && cmd != XSDFEC_CLEAR_STATS)) {
+ dev_err(xsdfec->dev, "SDFEC%d in failed state. Reset Required",
+ xsdfec->config.fec_id);
+ return -EPERM;
+ }
+
if (_IOC_TYPE(cmd) != XSDFEC_MAGIC)
return -ENOTTY;
@@ -926,9 +1031,27 @@ static long xsdfec_dev_ioctl(struct file *fptr, unsigned int cmd,
}
switch (cmd) {
+ case XSDFEC_START_DEV:
+ rval = xsdfec_start(xsdfec);
+ break;
+ case XSDFEC_STOP_DEV:
+ rval = xsdfec_stop(xsdfec);
+ break;
+ case XSDFEC_CLEAR_STATS:
+ rval = xsdfec_clear_stats(xsdfec);
+ break;
+ case XSDFEC_GET_STATS:
+ rval = xsdfec_get_stats(xsdfec, arg);
+ break;
+ case XSDFEC_GET_STATUS:
+ rval = xsdfec_get_status(xsdfec, arg);
+ break;
case XSDFEC_GET_CONFIG:
rval = xsdfec_get_config(xsdfec, arg);
break;
+ case XSDFEC_SET_DEFAULT_CONFIG:
+ rval = xsdfec_set_default_config(xsdfec);
+ break;
case XSDFEC_SET_IRQ:
rval = xsdfec_set_irq(xsdfec, arg);
break;
diff --git a/include/uapi/misc/xilinx_sdfec.h b/include/uapi/misc/xilinx_sdfec.h
index 120f7a3..f406c39 100644
--- a/include/uapi/misc/xilinx_sdfec.h
+++ b/include/uapi/misc/xilinx_sdfec.h
@@ -240,6 +240,21 @@ struct xsdfec_config {
};
/**
+ * struct xsdfec_stats - Stats retrived by ioctl XSDFEC_GET_STATS. Used
+ * to buffer atomic_t variables from struct
+ * xsdfec_dev. Counts are accumulated until
+ * the user clears them.
+ * @isr_err_count: Count of ISR errors
+ * @cecc_count: Count of Correctable ECC errors (SBE)
+ * @uecc_count: Count of Uncorrectable ECC errors (MBE)
+ */
+struct xsdfec_stats {
+ __u32 isr_err_count;
+ __u32 cecc_count;
+ __u32 uecc_count;
+};
+
+/**
* struct xsdfec_ldpc_param_table_sizes - Used to store sizes of SD-FEC table
* entries for an individual LPDC code
* parameter.
@@ -279,6 +294,32 @@ xsdfec_calculate_shared_ldpc_table_entry_size(struct xsdfec_ldpc_params *ldpc,
*/
#define XSDFEC_MAGIC 'f'
/**
+ * DOC: XSDFEC_START_DEV
+ *
+ * @Description
+ *
+ * ioctl to start SD-FEC core
+ *
+ * This fails if the XSDFEC_SET_ORDER ioctl has not been previously called
+ */
+#define XSDFEC_START_DEV _IO(XSDFEC_MAGIC, 0)
+/**
+ * DOC: XSDFEC_STOP_DEV
+ *
+ * @Description
+ *
+ * ioctl to stop the SD-FEC core
+ */
+#define XSDFEC_STOP_DEV _IO(XSDFEC_MAGIC, 1)
+/**
+ * DOC: XSDFEC_GET_STATUS
+ *
+ * @Description
+ *
+ * ioctl that returns status of SD-FEC core
+ */
+#define XSDFEC_GET_STATUS _IOR(XSDFEC_MAGIC, 2, struct xsdfec_status)
+/**
* DOC: XSDFEC_SET_IRQ
* @Parameters
*
@@ -397,4 +438,38 @@ xsdfec_calculate_shared_ldpc_table_entry_size(struct xsdfec_ldpc_params *ldpc,
* ioctl that determines if SD-FEC is processing data
*/
#define XSDFEC_IS_ACTIVE _IOR(XSDFEC_MAGIC, 10, bool)
+/**
+ * DOC: XSDFEC_CLEAR_STATS
+ *
+ * @Description
+ *
+ * ioctl that clears error stats collected during interrupts
+ */
+#define XSDFEC_CLEAR_STATS _IO(XSDFEC_MAGIC, 11)
+/**
+ * DOC: XSDFEC_GET_STATS
+ * @Parameters
+ *
+ * @struct xsdfec_stats *
+ * Pointer to the &struct xsdfec_stats that will contain the updated stats
+ * values
+ *
+ * @Description
+ *
+ * ioctl that returns SD-FEC core stats
+ *
+ * This can only be used when the driver is in the XSDFEC_STOPPED state
+ */
+#define XSDFEC_GET_STATS _IOR(XSDFEC_MAGIC, 12, struct xsdfec_stats)
+/**
+ * DOC: XSDFEC_SET_DEFAULT_CONFIG
+ *
+ * @Description
+ *
+ * ioctl that returns SD-FEC core to default config, use after a reset
+ *
+ * This can only be used when the driver is in the XSDFEC_STOPPED state
+ */
+#define XSDFEC_SET_DEFAULT_CONFIG _IO(XSDFEC_MAGIC, 13)
+
#endif /* __XILINX_SDFEC_H__ */
--
2.7.4
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