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Date: Wed, 14 Feb 2018 12:55:50 -0800
From: Moritz Fischer <mdf@...nel.org>
To: Wu Hao <hao.wu@...el.com>
Cc: atull@...nel.org, mdf@...nel.org, linux-fpga@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
luwei.kang@...el.com, yi.z.zhang@...el.com
Subject: Re: [PATCH v4 03/24] fpga: mgr: add status for fpga-manager
Hi Hao,
with Alan's Feedback
On Tue, Feb 13, 2018 at 05:24:32PM +0800, Wu Hao wrote:
> 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>
Acked-by: Moritz Fischer <mdf@...nel.org>
> ---
> 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/
> v4: simply code per suggestion from Alan.
> add supported status strings (and descriptions) in sysfs document.
> remove unused error code (SECURE_LOAD_ERR).
> ---
> Documentation/ABI/testing/sysfs-class-fpga-manager | 24 +++++++++++++++++++
> drivers/fpga/fpga-mgr.c | 28 ++++++++++++++++++++++
> include/linux/fpga/fpga-mgr.h | 9 +++++++
> 3 files changed, 61 insertions(+)
>
> diff --git a/Documentation/ABI/testing/sysfs-class-fpga-manager b/Documentation/ABI/testing/sysfs-class-fpga-manager
> index 23056c5..60db277 100644
> --- a/Documentation/ABI/testing/sysfs-class-fpga-manager
> +++ b/Documentation/ABI/testing/sysfs-class-fpga-manager
> @@ -35,3 +35,27 @@ 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: February 2018
> +KernelVersion: 4.16
> +Contact: Wu Hao <hao.wu@...el.com>
> +Description: Read fpga manager status as a string.
> + If FPGA programming operation fails, it could be caused by crc
> + error or incompatible bitstream image. The intent of this
> + interface is to provide more detailed information for FPGA
> + programming errors to userspace. This is a list of strings for
> + the supported status.
> +
> + * reconfig operation error - invalid operations detected by
> + reconfiguration hardware.
> + e.g start reconfiguration
> + with errors not cleared
> + * reconfig CRC error - CRC error detected by
> + reconfiguration hardware.
> + * reconfig incompatible image - reconfiguration image is
> + incompatible with hardware
> + * reconfig IP protocol error - protocol errors detected by
> + reconfiguration hardware
> + * reconfig fifo overflow error - FIFO overflow detected by
> + reconfiguration hardware
> diff --git a/drivers/fpga/fpga-mgr.c b/drivers/fpga/fpga-mgr.c
> index 245e7a6..50b7396 100644
> --- a/drivers/fpga/fpga-mgr.c
> +++ b/drivers/fpga/fpga-mgr.c
> @@ -397,12 +397,40 @@ 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);
> + u64 status;
> + int len = 0;
> +
> + if (!mgr->mops->status)
> + return -ENOENT;
> +
> + status = mgr->mops->status(mgr);
> +
> + if (status & FPGA_MGR_STATUS_OPERATION_ERR)
> + len += sprintf(buf + len, "reconfig operation error\n");
> + if (status & FPGA_MGR_STATUS_CRC_ERR)
> + len += sprintf(buf + len, "reconfig CRC error\n");
> + if (status & FPGA_MGR_STATUS_INCOMPATIBLE_IMAGE_ERR)
> + len += sprintf(buf + len, "reconfig incompatible image\n");
> + if (status & FPGA_MGR_STATUS_IP_PROTOCOL_ERR)
> + len += sprintf(buf + len, "reconfig IP protocol error\n");
> + if (status & FPGA_MGR_STATUS_FIFO_OVERFLOW_ERR)
> + len += sprintf(buf + len, "reconfig fifo overflow 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);
> diff --git a/include/linux/fpga/fpga-mgr.h b/include/linux/fpga/fpga-mgr.h
> index 6e98b66..6c79183 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 +139,13 @@ 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)
> +
> /**
> * struct fpga_manager - fpga manager structure
> * @name: name of low level fpga manager
> --
> 2.7.4
>
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