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Date: Wed, 4 May 2022 17:05:13 +0200
From: Stefan Wahren <stefan.wahren@...e.com>
To: Adrien Thierry <athierry@...hat.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Florian Fainelli <f.fainelli@...il.com>,
Ray Jui <rjui@...adcom.com>,
Scott Branden <sbranden@...adcom.com>,
bcm-kernel-feedback-list@...adcom.com,
Nicolas Saenz Julienne <nsaenz@...nel.org>
Cc: linux-staging@...ts.linux.dev,
linux-rpi-kernel@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] staging: vchiq_arm: get rid of global device
structure
Hi Adrien,
Am 02.05.22 um 20:30 schrieb Adrien Thierry:
> Get rid of the global g_dev structure.
i understand the motivation, but could you please explain more in detail
why you decided to add vchiq_instance instead of device reference? I
think vchiq_instance is a more internal structure which should be
avoided in kernel consumers like bcm2835-audio or mmal.
Best regards
>
> This is part of an effort to address TODO item "Get rid of all non
> essential global structures and create a proper per device structure"
>
> Signed-off-by: Adrien Thierry <athierry@...hat.com>
> ---
> .../bcm2835-audio/bcm2835-vchiq.c | 7 ++-
> .../include/linux/raspberrypi/vchiq.h | 12 ++--
> .../interface/vchiq_arm/vchiq_arm.c | 63 +++++++++----------
> .../interface/vchiq_arm/vchiq_core.c | 14 ++---
> .../interface/vchiq_arm/vchiq_core.h | 10 +--
> .../interface/vchiq_arm/vchiq_dev.c | 2 +-
> .../vc04_services/vchiq-mmal/mmal-vchiq.c | 2 +-
> 7 files changed, 53 insertions(+), 57 deletions(-)
>
> diff --git a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-vchiq.c b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-vchiq.c
> index e429b33b4d39..701abe430877 100644
> --- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-vchiq.c
> +++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-vchiq.c
> @@ -322,6 +322,8 @@ int bcm2835_audio_write(struct bcm2835_alsa_stream *alsa_stream,
> unsigned int size, void *src)
> {
> struct bcm2835_audio_instance *instance = alsa_stream->instance;
> + struct bcm2835_vchi_ctx *vchi_ctx = alsa_stream->chip->vchi_ctx;
> + struct vchiq_instance *vchiq_instance = vchi_ctx->instance;
> struct vc_audio_msg m = {
> .type = VC_AUDIO_MSG_TYPE_WRITE,
> .write.count = size,
> @@ -343,9 +345,8 @@ int bcm2835_audio_write(struct bcm2835_alsa_stream *alsa_stream,
> count = size;
> if (!instance->max_packet) {
> /* Send the message to the videocore */
> - status = vchiq_bulk_transmit(instance->service_handle, src,
> - count, NULL,
> - VCHIQ_BULK_MODE_BLOCKING);
> + status = vchiq_bulk_transmit(vchiq_instance, instance->service_handle, src, count,
> + NULL, VCHIQ_BULK_MODE_BLOCKING);
> } else {
> while (count > 0) {
> int bytes = min(instance->max_packet, count);
> diff --git a/drivers/staging/vc04_services/include/linux/raspberrypi/vchiq.h b/drivers/staging/vc04_services/include/linux/raspberrypi/vchiq.h
> index c93f2f3e87bb..715f02e7f1e1 100644
> --- a/drivers/staging/vc04_services/include/linux/raspberrypi/vchiq.h
> +++ b/drivers/staging/vc04_services/include/linux/raspberrypi/vchiq.h
> @@ -96,12 +96,12 @@ extern void vchiq_release_message(unsigned int service,
> struct vchiq_header *header);
> extern int vchiq_queue_kernel_message(unsigned int handle, void *data,
> unsigned int size);
> -extern enum vchiq_status vchiq_bulk_transmit(unsigned int service,
> - const void *data, unsigned int size, void *userdata,
> - enum vchiq_bulk_mode mode);
> -extern enum vchiq_status vchiq_bulk_receive(unsigned int service,
> - void *data, unsigned int size, void *userdata,
> - enum vchiq_bulk_mode mode);
> +extern enum vchiq_status vchiq_bulk_transmit(struct vchiq_instance *instance, unsigned int service,
> + const void *data, unsigned int size, void *userdata,
> + enum vchiq_bulk_mode mode);
> +extern enum vchiq_status vchiq_bulk_receive(struct vchiq_instance *instance, unsigned int service,
> + void *data, unsigned int size, void *userdata,
> + enum vchiq_bulk_mode mode);
> extern void *vchiq_get_service_userdata(unsigned int service);
> extern enum vchiq_status vchiq_get_peer_version(unsigned int handle,
> short *peer_version);
> diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
> index e6e0737c85fc..3b447c635c3f 100644
> --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
> +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
> @@ -148,12 +148,11 @@ static unsigned int g_fragments_size;
> static char *g_fragments_base;
> static char *g_free_fragments;
> static struct semaphore g_free_fragments_sema;
> -static struct device *g_dev;
>
> static DEFINE_SEMAPHORE(g_free_fragments_mutex);
>
> static enum vchiq_status
> -vchiq_blocking_bulk_transfer(unsigned int handle, void *data,
> +vchiq_blocking_bulk_transfer(struct vchiq_instance *instance, unsigned int handle, void *data,
> unsigned int size, enum vchiq_bulk_dir dir);
>
> static irqreturn_t
> @@ -175,17 +174,17 @@ vchiq_doorbell_irq(int irq, void *dev_id)
> }
>
> static void
> -cleanup_pagelistinfo(struct vchiq_pagelist_info *pagelistinfo)
> +cleanup_pagelistinfo(struct vchiq_instance *instance, struct vchiq_pagelist_info *pagelistinfo)
> {
> if (pagelistinfo->scatterlist_mapped) {
> - dma_unmap_sg(g_dev, pagelistinfo->scatterlist,
> + dma_unmap_sg(instance->state->dev, pagelistinfo->scatterlist,
> pagelistinfo->num_pages, pagelistinfo->dma_dir);
> }
>
> if (pagelistinfo->pages_need_release)
> unpin_user_pages(pagelistinfo->pages, pagelistinfo->num_pages);
>
> - dma_free_coherent(g_dev, pagelistinfo->pagelist_buffer_size,
> + dma_free_coherent(instance->state->dev, pagelistinfo->pagelist_buffer_size,
> pagelistinfo->pagelist, pagelistinfo->dma_addr);
> }
>
> @@ -212,7 +211,7 @@ is_adjacent_block(u32 *addrs, u32 addr, unsigned int k)
> */
>
> static struct vchiq_pagelist_info *
> -create_pagelist(char *buf, char __user *ubuf,
> +create_pagelist(struct vchiq_instance *instance, char *buf, char __user *ubuf,
> size_t count, unsigned short type)
> {
> struct pagelist *pagelist;
> @@ -250,7 +249,7 @@ create_pagelist(char *buf, char __user *ubuf,
> /* Allocate enough storage to hold the page pointers and the page
> * list
> */
> - pagelist = dma_alloc_coherent(g_dev, pagelist_size, &dma_addr,
> + pagelist = dma_alloc_coherent(instance->state->dev, pagelist_size, &dma_addr,
> GFP_KERNEL);
>
> vchiq_log_trace(vchiq_arm_log_level, "%s - %pK", __func__, pagelist);
> @@ -292,7 +291,7 @@ create_pagelist(char *buf, char __user *ubuf,
> size_t bytes = PAGE_SIZE - off;
>
> if (!pg) {
> - cleanup_pagelistinfo(pagelistinfo);
> + cleanup_pagelistinfo(instance, pagelistinfo);
> return NULL;
> }
>
> @@ -315,7 +314,7 @@ create_pagelist(char *buf, char __user *ubuf,
> /* This is probably due to the process being killed */
> if (actual_pages > 0)
> unpin_user_pages(pages, actual_pages);
> - cleanup_pagelistinfo(pagelistinfo);
> + cleanup_pagelistinfo(instance, pagelistinfo);
> return NULL;
> }
> /* release user pages */
> @@ -338,13 +337,13 @@ create_pagelist(char *buf, char __user *ubuf,
> count -= len;
> }
>
> - dma_buffers = dma_map_sg(g_dev,
> + dma_buffers = dma_map_sg(instance->state->dev,
> scatterlist,
> num_pages,
> pagelistinfo->dma_dir);
>
> if (dma_buffers == 0) {
> - cleanup_pagelistinfo(pagelistinfo);
> + cleanup_pagelistinfo(instance, pagelistinfo);
> return NULL;
> }
>
> @@ -378,7 +377,7 @@ create_pagelist(char *buf, char __user *ubuf,
> char *fragments;
>
> if (down_interruptible(&g_free_fragments_sema)) {
> - cleanup_pagelistinfo(pagelistinfo);
> + cleanup_pagelistinfo(instance, pagelistinfo);
> return NULL;
> }
>
> @@ -397,7 +396,7 @@ create_pagelist(char *buf, char __user *ubuf,
> }
>
> static void
> -free_pagelist(struct vchiq_pagelist_info *pagelistinfo,
> +free_pagelist(struct vchiq_instance *instance, struct vchiq_pagelist_info *pagelistinfo,
> int actual)
> {
> struct pagelist *pagelist = pagelistinfo->pagelist;
> @@ -411,7 +410,7 @@ free_pagelist(struct vchiq_pagelist_info *pagelistinfo,
> * NOTE: dma_unmap_sg must be called before the
> * cpu can touch any of the data/pages.
> */
> - dma_unmap_sg(g_dev, pagelistinfo->scatterlist,
> + dma_unmap_sg(instance->state->dev, pagelistinfo->scatterlist,
> pagelistinfo->num_pages, pagelistinfo->dma_dir);
> pagelistinfo->scatterlist_mapped = 0;
>
> @@ -460,7 +459,7 @@ free_pagelist(struct vchiq_pagelist_info *pagelistinfo,
> set_page_dirty(pages[i]);
> }
>
> - cleanup_pagelistinfo(pagelistinfo);
> + cleanup_pagelistinfo(instance, pagelistinfo);
> }
>
> int vchiq_platform_init(struct platform_device *pdev, struct vchiq_state *state)
> @@ -547,7 +546,6 @@ int vchiq_platform_init(struct platform_device *pdev, struct vchiq_state *state)
> return err ? : -ENXIO;
> }
>
> - g_dev = dev;
> vchiq_log_info(vchiq_arm_log_level, "vchiq_init - done (slots %pK, phys %pad)",
> vchiq_slot_zero, &slot_phys);
>
> @@ -615,12 +613,12 @@ remote_event_signal(struct remote_event *event)
> }
>
> int
> -vchiq_prepare_bulk_data(struct vchiq_bulk *bulk, void *offset,
> +vchiq_prepare_bulk_data(struct vchiq_instance *instance, struct vchiq_bulk *bulk, void *offset,
> void __user *uoffset, int size, int dir)
> {
> struct vchiq_pagelist_info *pagelistinfo;
>
> - pagelistinfo = create_pagelist(offset, uoffset, size,
> + pagelistinfo = create_pagelist(instance, offset, uoffset, size,
> (dir == VCHIQ_BULK_RECEIVE)
> ? PAGELIST_READ
> : PAGELIST_WRITE);
> @@ -640,10 +638,10 @@ vchiq_prepare_bulk_data(struct vchiq_bulk *bulk, void *offset,
> }
>
> void
> -vchiq_complete_bulk(struct vchiq_bulk *bulk)
> +vchiq_complete_bulk(struct vchiq_instance *instance, struct vchiq_bulk *bulk)
> {
> if (bulk && bulk->remote_data && bulk->actual)
> - free_pagelist((struct vchiq_pagelist_info *)bulk->remote_data,
> + free_pagelist(instance, (struct vchiq_pagelist_info *)bulk->remote_data,
> bulk->actual);
> }
>
> @@ -834,8 +832,8 @@ vchiq_open_service(struct vchiq_instance *instance,
> EXPORT_SYMBOL(vchiq_open_service);
>
> enum vchiq_status
> -vchiq_bulk_transmit(unsigned int handle, const void *data, unsigned int size,
> - void *userdata, enum vchiq_bulk_mode mode)
> +vchiq_bulk_transmit(struct vchiq_instance *instance, unsigned int handle, const void *data,
> + unsigned int size, void *userdata, enum vchiq_bulk_mode mode)
> {
> enum vchiq_status status;
>
> @@ -843,13 +841,13 @@ vchiq_bulk_transmit(unsigned int handle, const void *data, unsigned int size,
> switch (mode) {
> case VCHIQ_BULK_MODE_NOCALLBACK:
> case VCHIQ_BULK_MODE_CALLBACK:
> - status = vchiq_bulk_transfer(handle,
> + status = vchiq_bulk_transfer(instance, handle,
> (void *)data, NULL,
> size, userdata, mode,
> VCHIQ_BULK_TRANSMIT);
> break;
> case VCHIQ_BULK_MODE_BLOCKING:
> - status = vchiq_blocking_bulk_transfer(handle, (void *)data, size,
> + status = vchiq_blocking_bulk_transfer(instance, handle, (void *)data, size,
> VCHIQ_BULK_TRANSMIT);
> break;
> default:
> @@ -871,8 +869,8 @@ vchiq_bulk_transmit(unsigned int handle, const void *data, unsigned int size,
> }
> EXPORT_SYMBOL(vchiq_bulk_transmit);
>
> -enum vchiq_status vchiq_bulk_receive(unsigned int handle, void *data,
> - unsigned int size, void *userdata,
> +enum vchiq_status vchiq_bulk_receive(struct vchiq_instance *instance, unsigned int handle,
> + void *data, unsigned int size, void *userdata,
> enum vchiq_bulk_mode mode)
> {
> enum vchiq_status status;
> @@ -881,12 +879,12 @@ enum vchiq_status vchiq_bulk_receive(unsigned int handle, void *data,
> switch (mode) {
> case VCHIQ_BULK_MODE_NOCALLBACK:
> case VCHIQ_BULK_MODE_CALLBACK:
> - status = vchiq_bulk_transfer(handle, data, NULL,
> + status = vchiq_bulk_transfer(instance, handle, data, NULL,
> size, userdata,
> mode, VCHIQ_BULK_RECEIVE);
> break;
> case VCHIQ_BULK_MODE_BLOCKING:
> - status = vchiq_blocking_bulk_transfer(handle, (void *)data, size,
> + status = vchiq_blocking_bulk_transfer(instance, handle, (void *)data, size,
> VCHIQ_BULK_RECEIVE);
> break;
> default:
> @@ -909,10 +907,9 @@ enum vchiq_status vchiq_bulk_receive(unsigned int handle, void *data,
> EXPORT_SYMBOL(vchiq_bulk_receive);
>
> static enum vchiq_status
> -vchiq_blocking_bulk_transfer(unsigned int handle, void *data, unsigned int size,
> - enum vchiq_bulk_dir dir)
> +vchiq_blocking_bulk_transfer(struct vchiq_instance *instance, unsigned int handle, void *data,
> + unsigned int size, enum vchiq_bulk_dir dir)
> {
> - struct vchiq_instance *instance;
> struct vchiq_service *service;
> enum vchiq_status status;
> struct bulk_waiter_node *waiter = NULL, *iter;
> @@ -921,8 +918,6 @@ vchiq_blocking_bulk_transfer(unsigned int handle, void *data, unsigned int size,
> if (!service)
> return VCHIQ_ERROR;
>
> - instance = service->instance;
> -
> vchiq_service_put(service);
>
> mutex_lock(&instance->bulk_waiter_list_mutex);
> @@ -959,7 +954,7 @@ vchiq_blocking_bulk_transfer(unsigned int handle, void *data, unsigned int size,
> }
> }
>
> - status = vchiq_bulk_transfer(handle, data, NULL, size,
> + status = vchiq_bulk_transfer(instance, handle, data, NULL, size,
> &waiter->bulk_waiter,
> VCHIQ_BULK_MODE_BLOCKING, dir);
> if ((status != VCHIQ_RETRY) || fatal_signal_pending(current) || !waiter->bulk_waiter.bulk) {
> diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c
> index 0d5c39d7c6e2..04eec18835da 100644
> --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c
> +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c
> @@ -1441,7 +1441,7 @@ abort_outstanding_bulks(struct vchiq_service *service,
> }
>
> if (queue->process != queue->local_insert) {
> - vchiq_complete_bulk(bulk);
> + vchiq_complete_bulk(service->instance, bulk);
>
> vchiq_log_info(SRVTRACE_LEVEL(service),
> "%s %c%c%c%c d:%d ABORTED - tx len:%d, rx len:%d",
> @@ -1769,7 +1769,7 @@ parse_message(struct vchiq_state *state, struct vchiq_header *header)
>
> DEBUG_TRACE(PARSE_LINE);
> WARN_ON(queue->process == queue->local_insert);
> - vchiq_complete_bulk(bulk);
> + vchiq_complete_bulk(service->instance, bulk);
> queue->process++;
> mutex_unlock(&service->bulk_mutex);
> DEBUG_TRACE(PARSE_LINE);
> @@ -2998,9 +2998,9 @@ vchiq_remove_service(unsigned int handle)
> * When called in blocking mode, the userdata field points to a bulk_waiter
> * structure.
> */
> -enum vchiq_status vchiq_bulk_transfer(unsigned int handle, void *offset, void __user *uoffset,
> - int size, void *userdata, enum vchiq_bulk_mode mode,
> - enum vchiq_bulk_dir dir)
> +enum vchiq_status vchiq_bulk_transfer(struct vchiq_instance *instance, unsigned int handle,
> + void *offset, void __user *uoffset, int size, void *userdata,
> + enum vchiq_bulk_mode mode, enum vchiq_bulk_dir dir)
> {
> struct vchiq_service *service = find_service_by_handle(handle);
> struct vchiq_bulk_queue *queue;
> @@ -3077,7 +3077,7 @@ enum vchiq_status vchiq_bulk_transfer(unsigned int handle, void *offset, void __
> bulk->size = size;
> bulk->actual = VCHIQ_BULK_ACTUAL_ABORTED;
>
> - if (vchiq_prepare_bulk_data(bulk, offset, uoffset, size, dir))
> + if (vchiq_prepare_bulk_data(instance, bulk, offset, uoffset, size, dir))
> goto unlock_error_exit;
>
> wmb();
> @@ -3141,7 +3141,7 @@ enum vchiq_status vchiq_bulk_transfer(unsigned int handle, void *offset, void __
> unlock_both_error_exit:
> mutex_unlock(&state->slot_mutex);
> cancel_bulk_error_exit:
> - vchiq_complete_bulk(bulk);
> + vchiq_complete_bulk(service->instance, bulk);
> unlock_error_exit:
> mutex_unlock(&service->bulk_mutex);
>
> diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h
> index 352017ff5309..2ce54ce9f02a 100644
> --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h
> +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h
> @@ -489,8 +489,8 @@ extern void
> remote_event_pollall(struct vchiq_state *state);
>
> extern enum vchiq_status
> -vchiq_bulk_transfer(unsigned int handle, void *offset, void __user *uoffset,
> - int size, void *userdata, enum vchiq_bulk_mode mode,
> +vchiq_bulk_transfer(struct vchiq_instance *instance, unsigned int handle, void *offset,
> + void __user *uoffset, int size, void *userdata, enum vchiq_bulk_mode mode,
> enum vchiq_bulk_dir dir);
>
> extern int
> @@ -556,10 +556,10 @@ vchiq_queue_message(unsigned int handle,
> void *context,
> size_t size);
>
> -int vchiq_prepare_bulk_data(struct vchiq_bulk *bulk, void *offset, void __user *uoffset,
> - int size, int dir);
> +int vchiq_prepare_bulk_data(struct vchiq_instance *instance, struct vchiq_bulk *bulk, void *offset,
> + void __user *uoffset, int size, int dir);
>
> -void vchiq_complete_bulk(struct vchiq_bulk *bulk);
> +void vchiq_complete_bulk(struct vchiq_instance *instance, struct vchiq_bulk *bulk);
>
> void remote_event_signal(struct remote_event *event);
>
> diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_dev.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_dev.c
> index 66bbfec332ba..077e3fcbd651 100644
> --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_dev.c
> +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_dev.c
> @@ -330,7 +330,7 @@ static int vchiq_irq_queue_bulk_tx_rx(struct vchiq_instance *instance,
> userdata = args->userdata;
> }
>
> - status = vchiq_bulk_transfer(args->handle, NULL, args->data, args->size,
> + status = vchiq_bulk_transfer(instance, args->handle, NULL, args->data, args->size,
> userdata, args->mode, dir);
>
> if (!waiter) {
> diff --git a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
> index 249dd3e30c2f..88813af8de49 100644
> --- a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
> +++ b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
> @@ -293,7 +293,7 @@ static void buffer_to_host_work_cb(struct work_struct *work)
> len = 8;
> /* queue the bulk submission */
> vchiq_use_service(instance->service_handle);
> - ret = vchiq_bulk_receive(instance->service_handle,
> + ret = vchiq_bulk_receive(instance->vchiq_instance, instance->service_handle,
> msg_context->u.bulk.buffer->buffer,
> /* Actual receive needs to be a multiple
> * of 4 bytes
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