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Subject[PATCH v3 03/21] fpga: mgr: add status for fpga-manager
Date
This patch adds status to fpga-manager data structure, to allow
driver to store full/partial reconfiguration errors and other
status information, and adds one status callback to fpga_manager_ops
to allow fpga_manager to collect latest status when failures are
detected.

The following sysfs file is created:
* /sys/class/fpga_manager/<fpga>/status
Return status of fpga manager, including reconfiguration errors.

Signed-off-by: Wu Hao <hao.wu@intel.com>
----
v3: add one line description for status
add status callback function to fpga_manager_ops
update fpga-mgr status if any failure or during initialization
s/INCOMPATIBLE_BS_ERR/INCOMPATIBLE_IMAGE_ERR/
---
Documentation/ABI/testing/sysfs-class-fpga-manager | 10 ++++++++
drivers/fpga/fpga-mgr.c | 28 ++++++++++++++++++++++
include/linux/fpga/fpga-mgr.h | 17 +++++++++++++
3 files changed, 55 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-class-fpga-manager b/Documentation/ABI/testing/sysfs-class-fpga-manager
index 23056c5..01db14d 100644
--- a/Documentation/ABI/testing/sysfs-class-fpga-manager
+++ b/Documentation/ABI/testing/sysfs-class-fpga-manager
@@ -35,3 +35,13 @@ Description: Read fpga manager state as a string.
* write complete = Doing post programming steps
* write complete error = Error while doing post programming
* operating = FPGA is programmed and operating
+
+What: /sys/class/fpga_manager/<fpga>/status
+Date: November 2017
+KernelVersion: 4.15
+Contact: Wu Hao <hao.wu@intel.com>
+Description: Read fpga manager status as a string.
+ If FPGA programming operation fails, it could be due to crc
+ error or incompatible bitstream image. The intent of this
+ interface is to provide more detailed information for FPGA
+ programming errors to userspace.
diff --git a/drivers/fpga/fpga-mgr.c b/drivers/fpga/fpga-mgr.c
index 1fd5494..8b583ba 100644
--- a/drivers/fpga/fpga-mgr.c
+++ b/drivers/fpga/fpga-mgr.c
@@ -88,6 +88,7 @@ static int fpga_mgr_write_init_buf(struct fpga_manager *mgr,
if (ret) {
dev_err(&mgr->dev, "Error preparing FPGA for writing\n");
mgr->state = FPGA_MGR_STATE_WRITE_INIT_ERR;
+ fpga_mgr_update_status(mgr);
return ret;
}

@@ -148,6 +149,7 @@ static int fpga_mgr_write_complete(struct fpga_manager *mgr,
if (ret) {
dev_err(&mgr->dev, "Error after writing image data to FPGA\n");
mgr->state = FPGA_MGR_STATE_WRITE_COMPLETE_ERR;
+ fpga_mgr_update_status(mgr);
return ret;
}
mgr->state = FPGA_MGR_STATE_OPERATING;
@@ -225,6 +227,7 @@ static int fpga_mgr_buf_load_mapped(struct fpga_manager *mgr,
if (ret) {
dev_err(&mgr->dev, "Error while writing image data to FPGA\n");
mgr->state = FPGA_MGR_STATE_WRITE_ERR;
+ fpga_mgr_update_status(mgr);
return ret;
}

@@ -397,12 +400,36 @@ static ssize_t state_show(struct device *dev,
return sprintf(buf, "%s\n", state_str[mgr->state]);
}

+static ssize_t status_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct fpga_manager *mgr = to_fpga_manager(dev);
+ int len = 0;
+
+ if (mgr->status & FPGA_MGR_STATUS_OPERATION_ERR)
+ len += sprintf(buf + len, "reconfig operation error\n");
+ if (mgr->status & FPGA_MGR_STATUS_CRC_ERR)
+ len += sprintf(buf + len, "reconfig CRC error\n");
+ if (mgr->status & FPGA_MGR_STATUS_INCOMPATIBLE_IMAGE_ERR)
+ len += sprintf(buf + len, "reconfig incompatible image\n");
+ if (mgr->status & FPGA_MGR_STATUS_IP_PROTOCOL_ERR)
+ len += sprintf(buf + len, "reconfig IP protocol error\n");
+ if (mgr->status & FPGA_MGR_STATUS_FIFO_OVERFLOW_ERR)
+ len += sprintf(buf + len, "reconfig fifo overflow error\n");
+ if (mgr->status & FPGA_MGR_STATUS_SECURE_LOAD_ERR)
+ len += sprintf(buf + len, "reconfig secure load error\n");
+
+ return len;
+}
+
static DEVICE_ATTR_RO(name);
static DEVICE_ATTR_RO(state);
+static DEVICE_ATTR_RO(status);

static struct attribute *fpga_mgr_attrs[] = {
&dev_attr_name.attr,
&dev_attr_state.attr,
+ &dev_attr_status.attr,
NULL,
};
ATTRIBUTE_GROUPS(fpga_mgr);
@@ -561,6 +588,7 @@ int fpga_mgr_register(struct fpga_manager *mgr)
* by bootloader or EEPROM.
*/
mgr->state = mgr->mops->state(mgr);
+ fpga_mgr_update_status(mgr);

device_initialize(&mgr->dev);
mgr->dev.class = fpga_mgr_class;
diff --git a/include/linux/fpga/fpga-mgr.h b/include/linux/fpga/fpga-mgr.h
index 6e98b66..d4faf3d 100644
--- a/include/linux/fpga/fpga-mgr.h
+++ b/include/linux/fpga/fpga-mgr.h
@@ -112,6 +112,7 @@ struct fpga_image_info {
* struct fpga_manager_ops - ops for low level fpga manager drivers
* @initial_header_size: Maximum number of bytes that should be passed into write_init
* @state: returns an enum value of the FPGA's state
+ * @status: returns status of the FPGA, including reconfiguration error code
* @write_init: prepare the FPGA to receive confuration data
* @write: write count bytes of configuration data to the FPGA
* @write_sg: write the scatter list of configuration data to the FPGA
@@ -126,6 +127,7 @@ struct fpga_image_info {
struct fpga_manager_ops {
size_t initial_header_size;
enum fpga_mgr_states (*state)(struct fpga_manager *mgr);
+ u64 (*status)(struct fpga_manager *mgr);
int (*write_init)(struct fpga_manager *mgr,
struct fpga_image_info *info,
const char *buf, size_t count);
@@ -137,6 +139,14 @@ struct fpga_manager_ops {
const struct attribute_group **groups;
};

+/* FPGA manager status: Partial/Full Reconfiguration errors */
+#define FPGA_MGR_STATUS_OPERATION_ERR BIT(0)
+#define FPGA_MGR_STATUS_CRC_ERR BIT(1)
+#define FPGA_MGR_STATUS_INCOMPATIBLE_IMAGE_ERR BIT(2)
+#define FPGA_MGR_STATUS_IP_PROTOCOL_ERR BIT(3)
+#define FPGA_MGR_STATUS_FIFO_OVERFLOW_ERR BIT(4)
+#define FPGA_MGR_STATUS_SECURE_LOAD_ERR BIT(5)
+
/**
* struct fpga_manager - fpga manager structure
* @name: name of low level fpga manager
@@ -144,6 +154,7 @@ struct fpga_manager_ops {
* @dev: fpga manager device
* @ref_mutex: only allows one reference to fpga manager
* @state: state of fpga manager
+ * @status: status of fpga manager, including reconfiguration error.
* @mops: pointer to struct of fpga manager ops
* @priv: low level driver private date
*/
@@ -153,6 +164,7 @@ struct fpga_manager {
struct device dev;
struct mutex ref_mutex;
enum fpga_mgr_states state;
+ u64 status;
const struct fpga_manager_ops *mops;
void *priv;
};
@@ -177,4 +189,9 @@ struct fpga_manager {
int fpga_mgr_register(struct fpga_manager *mgr);
void fpga_mgr_unregister(struct fpga_manager *mgr);

+static inline void fpga_mgr_update_status(struct fpga_manager *mgr)
+{
+ if (mgr->mops->status)
+ mgr->status = mgr->mops->status(mgr);
+}
#endif /*_LINUX_FPGA_MGR_H */
--
1.8.3.1
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