Re: [PATCH 2/3] staging: vchiq_arm: get rid of global device structure
From: Stefan Wahren
Date: Wed May 04 2022 - 11:05:48 EST
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@xxxxxxxxxx>
---
.../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