From: Frederic Barrat <fbarrat@linux.ibm.com>
To: "Alastair D'Silva" <alastair@au1.ibm.com>, alastair@d-silva.org
Cc: Andrew Donnellan <andrew.donnellan@au1.ibm.com>,
Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH v3 6/7] ocxl: move event_fd handling to frontend
Date: Mon, 25 Mar 2019 16:41:34 +0100 [thread overview]
Message-ID: <f990a76d-76e4-32ac-e618-5bfe2a267cb6@linux.ibm.com> (raw)
In-Reply-To: <20190325054438.15022-7-alastair@au1.ibm.com>
Le 25/03/2019 à 06:44, Alastair D'Silva a écrit :
> From: Alastair D'Silva <alastair@d-silva.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@d-silva.org>
> ---
> drivers/misc/ocxl/afu_irq.c | 76 ++++++++++++++++++-------------
> drivers/misc/ocxl/file.c | 22 ++++++++-
> drivers/misc/ocxl/ocxl_internal.h | 5 --
> include/misc/ocxl.h | 46 +++++++++++++++++++
> 4 files changed, 111 insertions(+), 38 deletions(-)
>
> diff --git a/drivers/misc/ocxl/afu_irq.c b/drivers/misc/ocxl/afu_irq.c
> index 2d410cd6f817..d71e62df7d31 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 +26,43 @@ 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;
> +
> + rc = 0;
> + goto unlock;
That goto is too much.
> +
> +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)
> @@ -118,6 +149,8 @@ int ocxl_afu_irq_alloc(struct ocxl_context *ctx, int *irq_id)
> return rc;
> }
>
> +EXPORT_SYMBOL_GPL(ocxl_afu_irq_alloc);
nit: checkpatch doesn't like the empty line between the function and its
symbol export. Also true for a few other symbols in that file.
> diff --git a/include/misc/ocxl.h b/include/misc/ocxl.h
> index a8fe0ce4ea67..1b48e9d63abb 100644
> --- a/include/misc/ocxl.h
> +++ b/include/misc/ocxl.h
> @@ -161,6 +161,52 @@ 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
We should mention free_private can be NULL, in which case it is ignored.
Fred
next prev parent reply other threads:[~2019-03-25 15:41 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-27 4:57 [PATCH 0/5] ocxl: OpenCAPI Cleanup Alastair D'Silva
2019-02-27 4:57 ` [PATCH 1/5] ocxl: Rename struct link to ocxl_link Alastair D'Silva
2019-02-27 7:15 ` Andrew Donnellan
2019-02-27 7:34 ` Alastair D'Silva
2019-02-27 7:54 ` Andrew Donnellan
2019-02-27 8:04 ` Alastair D'Silva
2019-02-27 8:18 ` Andrew Donnellan
2019-02-27 13:45 ` Frederic Barrat
2019-02-27 13:59 ` Greg Kurz
2019-02-27 13:53 ` Greg Kurz
2019-02-27 4:57 ` [PATCH 2/5] ocxl: Clean up printf formats Alastair D'Silva
2019-02-27 13:40 ` Frederic Barrat
2019-02-28 5:02 ` Andrew Donnellan
2019-03-02 1:13 ` Joe Perches
2019-02-27 4:57 ` [PATCH 3/5] ocxl: read_pasid never returns an error, so make it void Alastair D'Silva
2019-02-27 13:25 ` Frederic Barrat
2019-02-28 5:03 ` Andrew Donnellan
2019-02-27 4:57 ` [PATCH 4/5] ocxl: Remove superfluous 'extern' from headers Alastair D'Silva
2019-02-27 13:36 ` Frederic Barrat
2019-02-28 5:05 ` Andrew Donnellan
2019-02-27 4:57 ` [PATCH 5/5] ocxl: Remove some unused exported symbols Alastair D'Silva
2019-02-27 13:39 ` Frederic Barrat
2019-02-28 5:23 ` Andrew Donnellan
2019-03-13 4:06 ` [PATCH v2 0/5] ocxl: OpenCAPI Cleanup Alastair D'Silva
2019-03-13 4:06 ` [PATCH 1/5] ocxl: Rename struct link to ocxl_link Alastair D'Silva
2019-03-15 6:58 ` Andrew Donnellan
2019-03-13 4:06 ` [PATCH 2/5] ocxl: Clean up printf formats Alastair D'Silva
2019-03-13 8:24 ` Greg Kurz
2019-03-14 4:58 ` Andrew Donnellan
2019-03-13 4:06 ` [PATCH 3/5] ocxl: read_pasid never returns an error, so make it void Alastair D'Silva
2019-03-14 4:59 ` Andrew Donnellan
2019-03-13 4:07 ` [PATCH 4/5] ocxl: Remove superfluous 'extern' from headers Alastair D'Silva
2019-03-13 8:28 ` Greg Kurz
2019-03-14 5:08 ` Andrew Donnellan
2019-03-13 4:07 ` [PATCH 5/5] ocxl: Remove some unused exported symbols Alastair D'Silva
2019-03-13 9:10 ` Greg Kurz
2019-03-14 2:23 ` Alastair D'Silva
2019-03-14 6:50 ` Greg Kurz
2019-03-15 4:49 ` Andrew Donnellan
2019-03-15 5:07 ` Andrew Donnellan
2019-03-20 5:34 ` [PATCH v3 0/5] ocxl: OpenCAPI Cleanup Alastair D'Silva
2019-03-20 5:34 ` [PATCH v3 1/5] ocxl: Rename struct link to ocxl_link Alastair D'Silva
2019-03-20 5:34 ` [PATCH v3 2/5] ocxl: Clean up printf formats Alastair D'Silva
2019-03-20 17:24 ` Joe Perches
2019-03-20 5:34 ` [PATCH v3 3/5] ocxl: read_pasid never returns an error, so make it void Alastair D'Silva
2019-03-20 5:34 ` [PATCH v3 4/5] ocxl: Remove superfluous 'extern' from headers Alastair D'Silva
2019-03-20 5:34 ` [PATCH v3 5/5] ocxl: Remove some unused exported symbols Alastair D'Silva
2019-03-25 5:34 ` [PATCH v4 0/4] ocxl: OpenCAPI Cleanup Alastair D'Silva
2019-03-25 5:34 ` [PATCH v4 1/4] ocxl: Rename struct link to ocxl_link Alastair D'Silva
2019-04-03 14:18 ` Frederic Barrat
2019-04-05 7:05 ` Andrew Donnellan
2019-05-03 6:59 ` Michael Ellerman
2019-03-25 5:34 ` [PATCH v4 2/4] ocxl: read_pasid never returns an error, so make it void Alastair D'Silva
2019-04-03 14:20 ` Frederic Barrat
2019-04-05 7:05 ` Andrew Donnellan
2019-03-25 5:34 ` [PATCH v4 3/4] ocxl: Remove superfluous 'extern' from headers Alastair D'Silva
2019-03-25 16:55 ` Greg Kurz
2019-04-03 14:20 ` Frederic Barrat
2019-04-05 7:09 ` Andrew Donnellan
2019-03-25 5:34 ` [PATCH v4 4/4] ocxl: Remove some unused exported symbols Alastair D'Silva
2019-03-25 16:57 ` Greg Kurz
2019-04-03 14:23 ` Frederic Barrat
2019-04-05 7:28 ` Andrew Donnellan
2019-03-25 16:49 ` [PATCH v4 0/4] ocxl: OpenCAPI Cleanup Greg Kurz
2019-03-25 17:34 ` Frederic Barrat
2019-03-25 21:45 ` Alastair D'Silva
2019-03-25 5:44 ` [PATCH v3 0/7] Refactor OCXL driver to allow external drivers to use it Alastair D'Silva
2019-03-25 5:44 ` [PATCH v3 1/7] ocxl: Split pci.c Alastair D'Silva
2019-03-25 10:01 ` Frederic Barrat
2019-03-25 5:44 ` [PATCH v3 2/7] ocxl: Don't pass pci_dev around Alastair D'Silva
2019-03-25 10:04 ` Frederic Barrat
2019-03-25 5:44 ` [PATCH v3 3/7] ocxl: Create a clear delineation between ocxl backend & frontend Alastair D'Silva
2019-03-25 15:11 ` Frederic Barrat
2019-03-25 5:44 ` [PATCH v3 4/7] ocxl: Allow external drivers to use OpenCAPI contexts Alastair D'Silva
2019-03-25 15:13 ` Frederic Barrat
2019-03-25 5:44 ` [PATCH v3 5/7] ocxl: afu_irq only deals with IRQ IDs, not offsets Alastair D'Silva
2019-03-25 15:24 ` Frederic Barrat
2019-03-25 5:44 ` [PATCH v3 6/7] ocxl: move event_fd handling to frontend Alastair D'Silva
2019-03-25 15:41 ` Frederic Barrat [this message]
2019-03-25 5:44 ` [PATCH v3 7/7] ocxl: Provide global MMIO accessors for external drivers Alastair D'Silva
2019-03-25 15:49 ` Frederic Barrat
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