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Date: Mon, 4 Dec 2017 14:55:42 -0600
From: Alan Tull <atull@...nel.org>
To: Wu Hao <hao.wu@...el.com>
Cc: Moritz Fischer <mdf@...nel.org>, linux-fpga@...r.kernel.org,
linux-kernel <linux-kernel@...r.kernel.org>,
linux-api@...r.kernel.org, "Kang, Luwei" <luwei.kang@...el.com>,
"Zhang, Yi Z" <yi.z.zhang@...el.com>
Subject: Re: [PATCH v3 03/21] fpga: mgr: add status for fpga-manager
On Mon, Nov 27, 2017 at 12:42 AM, Wu Hao <hao.wu@...el.com> wrote:
Hi Hao,
mgr->status isn't used anywhere except in status_show. So we don't
need to add status to the fpga_manager struct. Also don't need the
inline function to update it. Just read the status in status_show, if
that ops exists. If mops->status is NULL, return an error, as below.
This will simplify things and make sure that status_show gets status
that is not stale at all.
> 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@...el.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@...el.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);
Remove these fpga_mgr_update_status
> 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;
u64 status;
if (!mgr->mops->status)
return -ENOENT;
status = mgr->mops->status(mgr);
> +
> + if (mgr->status & FPGA_MGR_STATUS_OPERATION_ERR)
if (status & ...)
> + 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;
Remove.
> 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);
> +}
Remove fpga_mgr_update_status, not needed.
Thanks,
Alan
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