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Date: Fri, 10 Sep 2021 16:50:05 +0800
From: Xu Yilun <yilun.xu@...el.com>
To: Russ Weight <russell.h.weight@...el.com>
Cc: mdf@...nel.org, linux-fpga@...r.kernel.org,
linux-kernel@...r.kernel.org, trix@...hat.com, lgoncalv@...hat.com,
hao.wu@...el.com, matthew.gerlach@...el.com
Subject: Re: [PATCH v15 4/6] fpga: image-load: add status ioctl
On Wed, Sep 08, 2021 at 07:18:44PM -0700, Russ Weight wrote:
> Extend the FPGA Image Load class driver to include an
> FPGA_IMAGE_LOAD_STATUS IOCTL that can be used to monitor the progress
> of an ongoing image load. The status returned includes how much data
> remains to be transferred, the progress of the image load, and error
> information in the case of a failure.
>
> Signed-off-by: Russ Weight <russell.h.weight@...el.com>
> ---
> V15:
> - This patch is new to the patchset and provides an FPGA_IMAGE_LOAD_STATUS
> IOCTL to return the current values for: remaining_size, progress,
> err_progress, and err_code.
> - This patch has elements of the following three patches from the previous
> patch-set:
> [PATCH v14 3/6] fpga: sec-mgr: expose sec-mgr update status
> [PATCH v14 4/6] fpga: sec-mgr: expose sec-mgr update errors
> [PATCH v14 5/6] fpga: sec-mgr: expose sec-mgr update size
> - Changed file, symbol, and config names to reflect the new driver name
> - There are some minor changes to locking to enable this ioctl to return
> coherent data.
> ---
> Documentation/fpga/fpga-image-load.rst | 6 +++
> drivers/fpga/fpga-image-load.c | 53 ++++++++++++++++++++++----
> include/uapi/linux/fpga-image-load.h | 18 +++++++++
> 3 files changed, 70 insertions(+), 7 deletions(-)
>
> diff --git a/Documentation/fpga/fpga-image-load.rst b/Documentation/fpga/fpga-image-load.rst
> index 739d735592a5..3d5eb51223e3 100644
> --- a/Documentation/fpga/fpga-image-load.rst
> +++ b/Documentation/fpga/fpga-image-load.rst
> @@ -31,3 +31,9 @@ updated. This is an exclusive operation; an attempt to start concurrent image
> load for the same device will fail with EBUSY. An eventfd file descriptor
> parameter is provided to this IOCTL, and it will be signalled at the
> completion of the image load.
> +
> +FPGA_IMAGE_LOAD_STATUS:
> +
> +Collect status for an on-going image upload. The status returned includes
> +how much data remains to be transferred, the progress of the image load,
> +and error information in the case of a failure.
> diff --git a/drivers/fpga/fpga-image-load.c b/drivers/fpga/fpga-image-load.c
> index b784456765b0..99a47b21c995 100644
> --- a/drivers/fpga/fpga-image-load.c
> +++ b/drivers/fpga/fpga-image-load.c
> @@ -22,10 +22,27 @@ static dev_t fpga_image_devt;
>
> #define to_image_load(d) container_of(d, struct fpga_image_load, dev)
>
> -static void fpga_image_dev_error(struct fpga_image_load *imgld,
> +static void fpga_image_update_progress(struct fpga_image_load *imgld,
> + enum fpga_image_prog new_progress)
> +{
> + mutex_lock(&imgld->lock);
> + imgld->progress = new_progress;
> + mutex_unlock(&imgld->lock);
> +}
> +
> +static void fpga_image_set_error(struct fpga_image_load *imgld,
> enum fpga_image_err err_code)
> {
> + mutex_lock(&imgld->lock);
> + imgld->err_progress = imgld->progress;
> imgld->err_code = err_code;
> + mutex_unlock(&imgld->lock);
> +}
> +
> +static void fpga_image_dev_error(struct fpga_image_load *imgld,
> + enum fpga_image_err err_code)
> +{
> + fpga_image_set_error(imgld, err_code);
> imgld->lops->cancel(imgld);
> }
>
> @@ -49,18 +66,18 @@ static void fpga_image_do_load(struct work_struct *work)
>
> get_device(&imgld->dev);
> if (!try_module_get(imgld->dev.parent->driver->owner)) {
> - imgld->err_code = FPGA_IMAGE_ERR_BUSY;
> + fpga_image_set_error(imgld, FPGA_IMAGE_ERR_BUSY);
> goto idle_exit;
> }
>
> - imgld->progress = FPGA_IMAGE_PROG_PREPARING;
> + fpga_image_update_progress(imgld, FPGA_IMAGE_PROG_PREPARING);
> ret = imgld->lops->prepare(imgld);
> if (ret != FPGA_IMAGE_ERR_NONE) {
> fpga_image_dev_error(imgld, ret);
> goto modput_exit;
> }
>
> - imgld->progress = FPGA_IMAGE_PROG_WRITING;
> + fpga_image_update_progress(imgld, FPGA_IMAGE_PROG_WRITING);
> while (imgld->remaining_size) {
> ret = imgld->lops->write_blk(imgld, offset);
> if (ret != FPGA_IMAGE_ERR_NONE) {
> @@ -71,7 +88,7 @@ static void fpga_image_do_load(struct work_struct *work)
> offset = size - imgld->remaining_size;
> }
>
> - imgld->progress = FPGA_IMAGE_PROG_PROGRAMMING;
> + fpga_image_update_progress(imgld, FPGA_IMAGE_PROG_PROGRAMMING);
> ret = imgld->lops->poll_complete(imgld);
> if (ret != FPGA_IMAGE_ERR_NONE)
> fpga_image_dev_error(imgld, ret);
> @@ -151,20 +168,42 @@ static int fpga_image_load_ioctl_write(struct fpga_image_load *imgld,
> return ret;
> }
>
> +static int fpga_image_load_ioctl_status(struct fpga_image_load *imgld,
> + unsigned long arg)
> +{
> + struct fpga_image_status status;
> +
> + memset(&status, 0, sizeof(status));
> + status.progress = imgld->progress;
> + status.remaining_size = imgld->remaining_size;
> + status.err_progress = imgld->err_progress;
> + status.err_code = imgld->err_code;
> +
> + if (copy_to_user((void __user *)arg, &status, sizeof(status)))
> + return -EFAULT;
> +
> + return 0;
> +}
> +
> static long fpga_image_load_ioctl(struct file *filp, unsigned int cmd,
> unsigned long arg)
> {
> struct fpga_image_load *imgld = filp->private_data;
> int ret = -ENOTTY;
>
> + mutex_lock(&imgld->lock);
> +
> switch (cmd) {
> case FPGA_IMAGE_LOAD_WRITE:
> - mutex_lock(&imgld->lock);
> ret = fpga_image_load_ioctl_write(imgld, arg);
> - mutex_unlock(&imgld->lock);
> + break;
> + case FPGA_IMAGE_LOAD_STATUS:
> + ret = fpga_image_load_ioctl_status(imgld, arg);
> break;
> }
>
> + mutex_unlock(&imgld->lock);
> +
> return ret;
> }
>
> diff --git a/include/uapi/linux/fpga-image-load.h b/include/uapi/linux/fpga-image-load.h
> index a60da115adf5..6a995bcc0fb7 100644
> --- a/include/uapi/linux/fpga-image-load.h
> +++ b/include/uapi/linux/fpga-image-load.h
> @@ -38,6 +38,7 @@ enum fpga_image_err {
> };
>
> #define FPGA_IMAGE_LOAD_WRITE _IOW(FPGA_IMAGE_LOAD_MAGIC, 0, struct fpga_image_write)
> +#define FPGA_IMAGE_LOAD_STATUS _IOR(FPGA_IMAGE_LOAD_MAGIC, 1, struct fpga_image_status)
>
> /**
> * FPGA_IMAGE_LOAD_WRITE - _IOW(FPGA_IMAGE_LOAD_MAGIC, 0,
> @@ -56,4 +57,21 @@ struct fpga_image_write {
> __u64 buf; /* User space address of source data */
> };
>
> +/**
> + * FPGA_IMAGE_LOAD_STATUS - _IOR(FPGA_IMAGE_LOAD_MAGIC, 1,
> + * struct fpga_image_status)
> + *
> + * Request status information for an ongoing update.
> + * data buffer, size, and an eventfd file descriptor.
This line is a typo.
> + *
> + * Return: 0 on success, -errno on failure.
> + */
> +struct fpga_image_status {
> + /* Output */
> + __u32 remaining_size; /* size remaining to transfer */
> + enum fpga_image_prog progress; /* current progress of image load */
> + enum fpga_image_prog err_progress; /* progress at time of error */
> + enum fpga_image_err err_code; /* error code */
Should we use __u32 for these enumeration types?
Thanks,
Yilun
> +};
> +
> #endif /* _UAPI_LINUX_FPGA_IMAGE_LOAD_H */
> --
> 2.25.1
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