linux-kernel - Re: [PATCH v3 5/5] staging: vchiq: Combine vchiq platform code into single file

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Date:   Sun, 11 Jul 2021 12:49:35 +0200
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Ojaswin Mujoo <ojaswin98@...il.com>, nsaenz@...nel.org
Cc:     gregkh@...uxfoundation.org, arnd@...db.de,
        dan.carpenter@...cle.com, phil@...pberrypi.com,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 5/5] staging: vchiq: Combine vchiq platform code into
 single file

Am 04.07.21 um 17:59 schrieb Ojaswin Mujoo:
> Combine the vchiq platform initialization code into a single file by
> merging vchiq_2835_arm.c into vchiq_arm.c
>
> Signed-off-by: Ojaswin Mujoo <ojaswin98@...il.com>
> ---
>  drivers/staging/vc04_services/Makefile        |   1 -
>  .../interface/vchiq_arm/vchiq_2835_arm.c      | 564 ------------------
>  .../interface/vchiq_arm/vchiq_arm.c           | 549 +++++++++++++++++
>  3 files changed, 549 insertions(+), 565 deletions(-)
>  delete mode 100644 drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
>
> diff --git a/drivers/staging/vc04_services/Makefile b/drivers/staging/vc04_services/Makefile
> index 0a04338fc962..1fd191e2e2a5 100644
> --- a/drivers/staging/vc04_services/Makefile
> +++ b/drivers/staging/vc04_services/Makefile
> @@ -4,7 +4,6 @@ obj-$(CONFIG_BCM2835_VCHIQ)	+= vchiq.o
>  vchiq-objs := \
>     interface/vchiq_arm/vchiq_core.o  \
>     interface/vchiq_arm/vchiq_arm.o \
> -   interface/vchiq_arm/vchiq_2835_arm.o \
>     interface/vchiq_arm/vchiq_debugfs.o \
>     interface/vchiq_arm/vchiq_connected.o \
>  
...
> 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 0f2de571eba7..9057d01ffd48 100644
> --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
> +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
> @@ -25,15 +25,32 @@
>  #include <linux/rcupdate.h>
>  #include <linux/delay.h>
>  #include <linux/slab.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/uaccess.h>
>  #include <soc/bcm2835/raspberrypi-firmware.h>
>  
>  #include "vchiq_core.h"
>  #include "vchiq_ioctl.h"
>  #include "vchiq_arm.h"
>  #include "vchiq_debugfs.h"
> +#include "vchiq_connected.h"
> +#include "vchiq_pagelist.h"
>  
>  #define DEVICE_NAME "vchiq"
>  
> +#define TOTAL_SLOTS (VCHIQ_SLOT_ZERO_SLOTS + 2 * 32)
> +
> +#define MAX_FRAGMENTS (VCHIQ_NUM_CURRENT_BULKS * 2)
> +
> +#define VCHIQ_PLATFORM_FRAGMENTS_OFFSET_IDX 0
> +#define VCHIQ_PLATFORM_FRAGMENTS_COUNT_IDX  1
> +
> +#define BELL0	0x00
> +#define BELL2	0x08
> +
> +#define ARM_DS_ACTIVE	BIT(2)
> +
>  /* Override the default prefix, which would be vchiq_arm (from the filename) */
>  #undef MODULE_PARAM_PREFIX
>  #define MODULE_PARAM_PREFIX DEVICE_NAME "."
> @@ -59,10 +76,542 @@ static struct vchiq_drvdata bcm2836_drvdata = {
>  	.cache_line_size = 64,
>  };
>  
> +struct vchiq_2835_state {
> +	int inited;
> +	struct vchiq_arm_state arm_state;
> +};
> +
> +struct vchiq_pagelist_info {
> +	struct pagelist *pagelist;
> +	size_t pagelist_buffer_size;
> +	dma_addr_t dma_addr;
> +	enum dma_data_direction dma_dir;
> +	unsigned int num_pages;
> +	unsigned int pages_need_release;
> +	struct page **pages;
> +	struct scatterlist *scatterlist;
> +	unsigned int scatterlist_mapped;
> +};
> +
> +static void __iomem *g_regs;
> +/* This value is the size of the L2 cache lines as understood by the
> + * VPU firmware, which determines the required alignment of the
> + * offsets/sizes in pagelists.
> + *
> + * Modern VPU firmware looks for a DT "cache-line-size" property in
> + * the VCHIQ node and will overwrite it with the actual L2 cache size,
> + * which the kernel must then respect.  That property was rejected
> + * upstream, so we have to use the VPU firmware's compatibility value
> + * of 32.
> + */
> +static unsigned int g_cache_line_size = 32;
> +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 irqreturn_t
> +vchiq_doorbell_irq(int irq, void *dev_id);
> +
> +static struct vchiq_pagelist_info *
> +create_pagelist(char *buf, char __user *ubuf, size_t count, unsigned short type);
> +
> +static void
> +free_pagelist(struct vchiq_pagelist_info *pagelistinfo,
> +	      int actual);

please no forward declarations of these 3 functions. Put them into the
right order instead ...

Since this patch is independent from the other ones from the series,
maybe Greg can merg the rest of the series.