On Wed, Oct 4, 2017 at 10:32 PM, Bjorn Andersson
<bjorn.andersson@xxxxxxxxxx> wrote:
> The Qualcomm remote file system protocol is used by certain remoteprocs,
> in particular the modem, to read and write persistent storage in
> platforms where only the application CPU has physical storage access.
>
> The protocol is based on a set of QMI-encoded control-messages and a
> shared memory buffer for exchaning the data. This driver implements the
> latter, providing the user space service access to the carved out chunk
> of memory.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
> ---
>
> Changes since v2:
> - Renamed driver to "rmtfs_mem" in attempt to clarify that this is not a
> file system, but some chunk of memory.
>
> Changes since v1:
> - RFSA device represented direclty by the reserved-memory node
>
> drivers/of/platform.c | 1 +
> drivers/soc/qcom/Kconfig | 11 ++
> drivers/soc/qcom/Makefile | 1 +
> drivers/soc/qcom/rmtfs_mem.c | 272 +++++++++++++++++++++++++++++++++++++++++++
> 4 files changed, 285 insertions(+)
> create mode 100644 drivers/soc/qcom/rmtfs_mem.c
>
> diff --git a/drivers/of/platform.c b/drivers/of/platform.c
> index ee89f096f0f3..e7548c9a9915 100644
> --- a/drivers/of/platform.c
> +++ b/drivers/of/platform.c
> @@ -498,6 +498,7 @@ EXPORT_SYMBOL_GPL(of_platform_default_populate);
>
> #ifndef CONFIG_PPC
> static const struct of_device_id reserved_mem_matches[] = {
> + { .compatible = "qcom,rmtfs-mem" },
> { .compatible = "ramoops" },
> {}
> };
> diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
> index 9fca977ef18d..6dff89eaf3f8 100644
> --- a/drivers/soc/qcom/Kconfig
> +++ b/drivers/soc/qcom/Kconfig
> @@ -24,6 +24,17 @@ config QCOM_PM
> modes. It interface with various system drivers to put the cores in
> low power modes.
>
> +config QCOM_RMTFS_MEM
> + tristate "Qualcomm Remote Filesystem memory driver"
> + depends on ARCH_QCOM
> + help
> + The Qualcomm remote filesystem memory driver is used for allocating
> + and exposing regions of shared memory with remote processors for the
> + purpose of exchanging sector-data between the remote filesystem
> + service and its clients.
> +
> + Say y here if you intend to boot the modem remoteproc.
> +
> config QCOM_SMEM
> tristate "Qualcomm Shared Memory Manager (SMEM)"
> depends on ARCH_QCOM
> diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
> index 414f0de274fa..541c1f40d126 100644
> --- a/drivers/soc/qcom/Makefile
> +++ b/drivers/soc/qcom/Makefile
> @@ -1,6 +1,7 @@
> obj-$(CONFIG_QCOM_GSBI) += qcom_gsbi.o
> obj-$(CONFIG_QCOM_MDT_LOADER) += mdt_loader.o
> obj-$(CONFIG_QCOM_PM) += spm.o
> +obj-$(CONFIG_QCOM_RMTFS_MEM) += rmtfs_mem.o
> obj-$(CONFIG_QCOM_SMD_RPM) += smd-rpm.o
> obj-$(CONFIG_QCOM_SMEM) += smem.o
> obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o
> diff --git a/drivers/soc/qcom/rmtfs_mem.c b/drivers/soc/qcom/rmtfs_mem.c
> new file mode 100644
> index 000000000000..2e7c955e7cf0
> --- /dev/null
> +++ b/drivers/soc/qcom/rmtfs_mem.c
> @@ -0,0 +1,272 @@
> +/*
> + * Copyright (c) 2017 Linaro Ltd.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/cdev.h>
> +#include <linux/err.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/of.h>
> +#include <linux/of_reserved_mem.h>
> +#include <linux/of_fdt.h>
This shouldn't be needed?
> +#include <linux/dma-mapping.h>
> +#include <linux/slab.h>
> +#include <linux/uaccess.h>
> +#include <linux/io.h>
> +#include <linux/qcom_scm.h>
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