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Date: Wed, 17 Apr 2019 17:33:54 +0200
From: Frederic Barrat <fbarrat@...ux.ibm.com>
To: "Alastair D'Silva" <alastair@....ibm.com>, alastair@...ilva.org
Cc: Andrew Donnellan <andrew.donnellan@....ibm.com>,
Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v4 6/7] ocxl: move event_fd handling to frontend
Le 27/03/2019 à 06:31, Alastair D'Silva a écrit :
> From: Alastair D'Silva <alastair@...ilva.org>
>
> Event_fd is only used in the driver frontend, so it does not
> need to exist in the backend code. Relocate it to the frontend
> and provide an opaque mechanism for consumers instead.
>
> Signed-off-by: Alastair D'Silva <alastair@...ilva.org>
> ---
Acked-by: Frederic Barrat <fbarrat@...ux.ibm.com>
> drivers/misc/ocxl/afu_irq.c | 74 ++++++++++++++++++-------------
> drivers/misc/ocxl/file.c | 22 ++++++++-
> drivers/misc/ocxl/ocxl_internal.h | 5 ---
> include/misc/ocxl.h | 46 +++++++++++++++++++
> 4 files changed, 109 insertions(+), 38 deletions(-)
>
> diff --git a/drivers/misc/ocxl/afu_irq.c b/drivers/misc/ocxl/afu_irq.c
> index 2d410cd6f817..70f8f1c3929d 100644
> --- a/drivers/misc/ocxl/afu_irq.c
> +++ b/drivers/misc/ocxl/afu_irq.c
> @@ -1,7 +1,7 @@
> // SPDX-License-Identifier: GPL-2.0+
> // Copyright 2017 IBM Corp.
> #include <linux/interrupt.h>
> -#include <linux/eventfd.h>
> +#include <asm/pnv-ocxl.h>
> #include "ocxl_internal.h"
> #include "trace.h"
>
> @@ -11,7 +11,9 @@ struct afu_irq {
> unsigned int virq;
> char *name;
> u64 trigger_page;
> - struct eventfd_ctx *ev_ctx;
> + irqreturn_t (*handler)(void *private);
> + void (*free_private)(void *private);
> + void *private;
> };
>
> int ocxl_irq_offset_to_id(struct ocxl_context *ctx, u64 offset)
> @@ -24,14 +26,44 @@ u64 ocxl_irq_id_to_offset(struct ocxl_context *ctx, int irq_id)
> return ctx->afu->irq_base_offset + (irq_id << PAGE_SHIFT);
> }
>
> +int ocxl_irq_set_handler(struct ocxl_context *ctx, int irq_id,
> + irqreturn_t (*handler)(void *private),
> + void (*free_private)(void *private),
> + void *private)
> +{
> + struct afu_irq *irq;
> + int rc;
> +
> + mutex_lock(&ctx->irq_lock);
> + irq = idr_find(&ctx->irq_idr, irq_id);
> + if (!irq) {
> + rc = -EINVAL;
> + goto unlock;
> + }
> +
> + irq->handler = handler;
> + irq->private = private;
> + irq->free_private = free_private;
> +
> + rc = 0;
> + // Fall through to unlock
> +
> +unlock:
> + mutex_unlock(&ctx->irq_lock);
> + return rc;
> +}
> +EXPORT_SYMBOL_GPL(ocxl_irq_set_handler);
> +
> static irqreturn_t afu_irq_handler(int virq, void *data)
> {
> struct afu_irq *irq = (struct afu_irq *) data;
>
> trace_ocxl_afu_irq_receive(virq);
> - if (irq->ev_ctx)
> - eventfd_signal(irq->ev_ctx, 1);
> - return IRQ_HANDLED;
> +
> + if (irq->handler)
> + return irq->handler(irq->private);
> +
> + return IRQ_HANDLED; // Just drop it on the ground
> }
>
> static int setup_afu_irq(struct ocxl_context *ctx, struct afu_irq *irq)
> @@ -117,6 +149,7 @@ int ocxl_afu_irq_alloc(struct ocxl_context *ctx, int *irq_id)
> kfree(irq);
> return rc;
> }
> +EXPORT_SYMBOL_GPL(ocxl_afu_irq_alloc);
>
> static void afu_irq_free(struct afu_irq *irq, struct ocxl_context *ctx)
> {
> @@ -126,8 +159,8 @@ static void afu_irq_free(struct afu_irq *irq, struct ocxl_context *ctx)
> ocxl_irq_id_to_offset(ctx, irq->id),
> 1 << PAGE_SHIFT, 1);
> release_afu_irq(irq);
> - if (irq->ev_ctx)
> - eventfd_ctx_put(irq->ev_ctx);
> + if (irq->free_private)
> + irq->free_private(irq->private);
> ocxl_link_free_irq(ctx->afu->fn->link, irq->hw_irq);
> kfree(irq);
> }
> @@ -148,6 +181,7 @@ int ocxl_afu_irq_free(struct ocxl_context *ctx, int irq_id)
> mutex_unlock(&ctx->irq_lock);
> return 0;
> }
> +EXPORT_SYMBOL_GPL(ocxl_afu_irq_free);
>
> void ocxl_afu_irq_free_all(struct ocxl_context *ctx)
> {
> @@ -160,31 +194,6 @@ void ocxl_afu_irq_free_all(struct ocxl_context *ctx)
> mutex_unlock(&ctx->irq_lock);
> }
>
> -int ocxl_afu_irq_set_fd(struct ocxl_context *ctx, int irq_id, int eventfd)
> -{
> - struct afu_irq *irq;
> - struct eventfd_ctx *ev_ctx;
> - int rc = 0;
> -
> - mutex_lock(&ctx->irq_lock);
> - irq = idr_find(&ctx->irq_idr, irq_id);
> - if (!irq) {
> - rc = -EINVAL;
> - goto unlock;
> - }
> -
> - ev_ctx = eventfd_ctx_fdget(eventfd);
> - if (IS_ERR(ev_ctx)) {
> - rc = -EINVAL;
> - goto unlock;
> - }
> -
> - irq->ev_ctx = ev_ctx;
> -unlock:
> - mutex_unlock(&ctx->irq_lock);
> - return rc;
> -}
> -
> u64 ocxl_afu_irq_get_addr(struct ocxl_context *ctx, int irq_id)
> {
> struct afu_irq *irq;
> @@ -197,3 +206,4 @@ u64 ocxl_afu_irq_get_addr(struct ocxl_context *ctx, int irq_id)
> mutex_unlock(&ctx->irq_lock);
> return addr;
> }
> +EXPORT_SYMBOL_GPL(ocxl_afu_irq_get_addr);
> diff --git a/drivers/misc/ocxl/file.c b/drivers/misc/ocxl/file.c
> index 7f5282a3af3a..8aa22893ed76 100644
> --- a/drivers/misc/ocxl/file.c
> +++ b/drivers/misc/ocxl/file.c
> @@ -3,6 +3,7 @@
> #include <linux/fs.h>
> #include <linux/poll.h>
> #include <linux/sched/signal.h>
> +#include <linux/eventfd.h>
> #include <linux/uaccess.h>
> #include <uapi/misc/ocxl.h>
> #include <asm/reg.h>
> @@ -183,11 +184,27 @@ static long afu_ioctl_get_features(struct ocxl_context *ctx,
> x == OCXL_IOCTL_GET_FEATURES ? "GET_FEATURES" : \
> "UNKNOWN")
>
> +static irqreturn_t irq_handler(void *private)
> +{
> + struct eventfd_ctx *ev_ctx = private;
> +
> + eventfd_signal(ev_ctx, 1);
> + return IRQ_HANDLED;
> +}
> +
> +static void irq_free(void *private)
> +{
> + struct eventfd_ctx *ev_ctx = private;
> +
> + eventfd_ctx_put(ev_ctx);
> +}
> +
> static long afu_ioctl(struct file *file, unsigned int cmd,
> unsigned long args)
> {
> struct ocxl_context *ctx = file->private_data;
> struct ocxl_ioctl_irq_fd irq_fd;
> + struct eventfd_ctx *ev_ctx;
> int irq_id;
> u64 irq_offset;
> long rc;
> @@ -239,7 +256,10 @@ static long afu_ioctl(struct file *file, unsigned int cmd,
> if (irq_fd.reserved)
> return -EINVAL;
> irq_id = ocxl_irq_offset_to_id(ctx, irq_fd.irq_offset);
> - rc = ocxl_afu_irq_set_fd(ctx, irq_id, irq_fd.eventfd);
> + ev_ctx = eventfd_ctx_fdget(irq_fd.eventfd);
> + if (!ev_ctx)
> + return -EFAULT;
> + rc = ocxl_irq_set_handler(ctx, irq_id, irq_handler, irq_free, ev_ctx);
> break;
>
> case OCXL_IOCTL_GET_METADATA:
> diff --git a/drivers/misc/ocxl/ocxl_internal.h b/drivers/misc/ocxl/ocxl_internal.h
> index 58969467bd5c..97415afd79f3 100644
> --- a/drivers/misc/ocxl/ocxl_internal.h
> +++ b/drivers/misc/ocxl/ocxl_internal.h
> @@ -139,11 +139,6 @@ void ocxl_sysfs_unregister_afu(struct ocxl_file_info *info);
>
> int ocxl_irq_offset_to_id(struct ocxl_context *ctx, u64 offset);
> u64 ocxl_irq_id_to_offset(struct ocxl_context *ctx, int irq_id);
> -int ocxl_afu_irq_alloc(struct ocxl_context *ctx, int *irq_id);
> -int ocxl_afu_irq_free(struct ocxl_context *ctx, int irq_id);
> void ocxl_afu_irq_free_all(struct ocxl_context *ctx);
> -int ocxl_afu_irq_set_fd(struct ocxl_context *ctx, int irq_id,
> - int eventfd);
> -u64 ocxl_afu_irq_get_addr(struct ocxl_context *ctx, int irq_id);
>
> #endif /* _OCXL_INTERNAL_H_ */
> diff --git a/include/misc/ocxl.h b/include/misc/ocxl.h
> index e4704632eac5..dea93885a839 100644
> --- a/include/misc/ocxl.h
> +++ b/include/misc/ocxl.h
> @@ -155,6 +155,52 @@ int ocxl_context_attach(struct ocxl_context *ctx, u64 amr,
> */
> int ocxl_context_detach(struct ocxl_context *ctx);
>
> +// AFU IRQs
> +
> +/**
> + * Allocate an IRQ associated with an AFU context
> + * @ctx: the AFU context
> + * @irq_id: out, the IRQ ID
> + *
> + * Returns 0 on success, negative on failure
> + */
> +extern int ocxl_afu_irq_alloc(struct ocxl_context *ctx, int *irq_id);
> +
> +/**
> + * Frees an IRQ associated with an AFU context
> + * @ctx: the AFU context
> + * @irq_id: the IRQ ID
> + *
> + * Returns 0 on success, negative on failure
> + */
> +extern int ocxl_afu_irq_free(struct ocxl_context *ctx, int irq_id);
> +
> +/**
> + * Gets the address of the trigger page for an IRQ
> + * This can then be provided to an AFU which will write to that
> + * page to trigger the IRQ.
> + * @ctx: The AFU context that the IRQ is associated with
> + * @irq_id: The IRQ ID
> + *
> + * returns the trigger page address, or 0 if the IRQ is not valid
> + */
> +extern u64 ocxl_afu_irq_get_addr(struct ocxl_context *ctx, int irq_id);
> +
> +/**
> + * Provide a callback to be called when an IRQ is triggered
> + * @ctx: The AFU context that the IRQ is associated with
> + * @irq_id: The IRQ ID
> + * @handler: the callback to be called when the IRQ is triggered
> + * @free_private: the callback to be called when the IRQ is freed (may be NULL)
> + * @private: Private data to be passed to the callbacks
> + *
> + * Returns 0 on success, negative on failure
> + */
> +int ocxl_irq_set_handler(struct ocxl_context *ctx, int irq_id,
> + irqreturn_t (*handler)(void *private),
> + void (*free_private)(void *private),
> + void *private);
> +
> // AFU Metadata
>
> /**
>
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