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SubjectRe: [RFC PATCH 2/6] char: fastrpc: Add Qualcomm fastrpc basic driver model
On Fri, Nov 30, 2018 at 10:46:53AM +0000, Srinivas Kandagatla wrote:
> This patch adds basic driver model for qualcomm fastrpc.
> Each DSP rpmsg channel is represented as fastrpc channel context and
> is exposed as a character driver for userspace interface.
> Each compute context bank is represented as fastrpc-session-context,
> which are dynamically managed by the channel context char device.
>
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
> ---
> drivers/char/Kconfig | 10 ++
> drivers/char/Makefile | 1 +
> drivers/char/fastrpc.c | 337 +++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 348 insertions(+)
> create mode 100644 drivers/char/fastrpc.c
>
> diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
> index 9d03b2ff5df6..75fd274c67df 100644
> --- a/drivers/char/Kconfig
> +++ b/drivers/char/Kconfig
> @@ -552,6 +552,16 @@ config ADI
> and SSM (Silicon Secured Memory). Intended consumers of this
> driver include crash and makedumpfile.
>
> +config QCOM_FASTRPC
> + tristate "Qualcomm FastRPC"
> + depends on ARCH_QCOM || COMPILE_TEST
> + depends on RPMSG
> + help
> + Provides a communication mechanism that allows for clients to
> + make remote method invocations across processor boundary to
> + applications DSP processor. Say M if you want to enable this
> + module.
> +
> endmenu
>
> config RANDOM_TRUST_CPU
> diff --git a/drivers/char/Makefile b/drivers/char/Makefile
> index b8d42b4e979b..30ec9187350e 100644
> --- a/drivers/char/Makefile
> +++ b/drivers/char/Makefile
> @@ -58,3 +58,4 @@ js-rtc-y = rtc.o
> obj-$(CONFIG_XILLYBUS) += xillybus/
> obj-$(CONFIG_POWERNV_OP_PANEL) += powernv-op-panel.o
> obj-$(CONFIG_ADI) += adi.o
> +obj-$(CONFIG_QCOM_FASTRPC) += fastrpc.o
> diff --git a/drivers/char/fastrpc.c b/drivers/char/fastrpc.c
> new file mode 100644
> index 000000000000..97d8062eb3e1
> --- /dev/null
> +++ b/drivers/char/fastrpc.c
> @@ -0,0 +1,337 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright (c) 2011-2018, The Linux Foundation. All rights reserved.
> +// Copyright (c) 2018, Linaro Limited
> +
> +#include <linux/cdev.h>
> +#include <linux/device.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/idr.h>
> +#include <linux/list.h>
> +#include <linux/module.h>
> +#include <linux/of_address.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +#include <linux/rpmsg.h>
> +#include <linux/scatterlist.h>
> +#include <linux/slab.h>
> +
> +#define ADSP_DOMAIN_ID (0)
> +#define MDSP_DOMAIN_ID (1)
> +#define SDSP_DOMAIN_ID (2)
> +#define CDSP_DOMAIN_ID (3)
> +#define FASTRPC_DEV_MAX 4 /* adsp, mdsp, slpi, cdsp*/
> +#define FASTRPC_MAX_SESSIONS 9 /*8 compute, 1 cpz*/
> +#define FASTRPC_CTX_MAX (256)
> +#define FASTRPC_CTXID_MASK (0xFF0)
> +#define FASTRPC_DEVICE_NAME "fastrpc"
> +
> +#define cdev_to_cctx(d) container_of(d, struct fastrpc_channel_ctx, cdev)
> +
> +static const char *domains[FASTRPC_DEV_MAX] = { "adsp", "mdsp",
> + "sdsp", "cdsp"};
> +static dev_t fastrpc_major;
Why do you need a whole major number for this? Why not just use the
misc interface instead?

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