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SubjectRe: [PATCH v5 5/7] ocxl: Expose the thread_id needed for wait on POWER9
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On 11/05/18 16:13, Alastair D'Silva wrote:
> From: Alastair D'Silva <alastair@d-silva.org>
>
> In order to successfully issue as_notify, an AFU needs to know the TID
> to notify, which in turn means that this information should be
> available in userspace so it can be communicated to the AFU.
>
> Signed-off-by: Alastair D'Silva <alastair@d-silva.org>

Acked-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>

Comments below.

> +#ifdef CONFIG_PPC64
> +static long afu_ioctl_enable_p9_wait(struct ocxl_context *ctx,
> + struct ocxl_ioctl_p9_wait __user *uarg)
> +{
> + struct ocxl_ioctl_p9_wait arg;
> +
> + memset(&arg, 0, sizeof(arg));
> +
> + if (cpu_has_feature(CPU_FTR_P9_TIDR)) {
> + enum ocxl_context_status status;
> +
> + // Locks both status & tidr
> + mutex_lock(&ctx->status_mutex);
> + if (!ctx->tidr) {
> + if (set_thread_tidr(current))
> + return -ENOENT;
> +
> + ctx->tidr = current->thread.tidr;
> + }
> +
> + status = ctx->status;
> + mutex_unlock(&ctx->status_mutex);
> +
> + if (status == ATTACHED) {
> + int rc;
> + struct link *link = ctx->afu->fn->link;
> +
> + rc = ocxl_link_update_pe(link, ctx->pasid, ctx->tidr);
> + if (rc)
> + return rc;
> + }
> +
> + arg.thread_id = ctx->tidr;
> + } else
> + return -ENOENT;

I didn't pick this up before - please please please use braces on both
sides of the if here.

> +
> + if (copy_to_user(uarg, &arg, sizeof(arg)))
> + return -EFAULT;
> +
> + return 0;
> +}
> +#endif

> diff --git a/include/misc/ocxl.h b/include/misc/ocxl.h
> index 51ccf76db293..9ff6ddc28e22 100644
> --- a/include/misc/ocxl.h
> +++ b/include/misc/ocxl.h
> @@ -188,6 +188,15 @@ extern int ocxl_link_add_pe(void *link_handle, int pasid, u32 pidr, u32 tidr,
> void (*xsl_err_cb)(void *data, u64 addr, u64 dsisr),
> void *xsl_err_data);
>
> +/**
> + * Update values within a Process Element
> + *
> + * link_handle: the link handle associated with the process element
> + * pasid: the PASID for the AFU context
> + * tid: the new thread id for the process element
> + */
> +extern int ocxl_link_update_pe(void *link_handle, int pasid, __u16 tid);

My earlier comment about __u16 vs u16 applies for this declaration (and
the body declaration) as well

--
Andrew Donnellan OzLabs, ADL Canberra
andrew.donnellan@au1.ibm.com IBM Australia Limited

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