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SubjectRe: [RFC PATCH 4/7] remoteproc: create the REMOTEPROC_VIRTIO config
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On 10/9/21 5:36 AM, Bjorn Andersson wrote:
> On Fri 01 Oct 05:12 CDT 2021, Arnaud Pouliquen wrote:
>
>> Create the config to associate to the remoteproc virtio.
>>
>> Notice that the REMOTEPROC_VIRTIO config can not set to m. the reason
>> is that it defines API that is used by the built-in remote proc core.
>> Functions such are rproc_add_virtio_dev can be called during the
>> Linux boot phase.
>>
>
> Please don't introduce new Kconfig options for everything. Consider that
> the expectation should be that everyone runs the default defconfig on
> their boards - and if someone actually needs this level of control, they
> are welcome to present patches with numbers showing the benefit of the
> savings.

My goal here was to decorrelate the remote virtio from the remote proc,
so that platforms based on a non-virtio solution do not embed the code.
By reading your commentary it jumps out at me that that's stupid. The
REMOTEPROC_VIRTIO config is useless as the remoteproc_virtio must be kept
built-in for legacy compatibility.

Thanks,
Arnaud

>
> Thanks,
> Bjorn
>
>> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
>> ---
>> drivers/remoteproc/Kconfig | 11 +++++++++-
>> drivers/remoteproc/Makefile | 2 +-
>> drivers/remoteproc/remoteproc_internal.h | 28 ++++++++++++++++++++++++
>> 3 files changed, 39 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
>> index 9a6eedc3994a..f271552c0d84 100644
>> --- a/drivers/remoteproc/Kconfig
>> +++ b/drivers/remoteproc/Kconfig
>> @@ -6,7 +6,7 @@ config REMOTEPROC
>> depends on HAS_DMA
>> select CRC32
>> select FW_LOADER
>> - select VIRTIO
>> + select REMOTEPROC_VIRTIO
>> select WANT_DEV_COREDUMP
>> help
>> Support for remote processors (such as DSP coprocessors). These
>> @@ -14,6 +14,15 @@ config REMOTEPROC
>>
>> if REMOTEPROC
>>
>> +config REMOTEPROC_VIRTIO
>> + bool "Remoteproc virtio device "
>> + select VIRTIO
>> + help
>> + Say y here to have a virtio device support for the remoteproc
>> + communication.
>> +
>> + It's safe to say N if you don't use the virtio for the IPC.
>> +
>> config REMOTEPROC_CDEV
>> bool "Remoteproc character device interface"
>> help
>> diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
>> index bb26c9e4ef9c..73d2384a76aa 100644
>> --- a/drivers/remoteproc/Makefile
>> +++ b/drivers/remoteproc/Makefile
>> @@ -8,8 +8,8 @@ remoteproc-y := remoteproc_core.o
>> remoteproc-y += remoteproc_coredump.o
>> remoteproc-y += remoteproc_debugfs.o
>> remoteproc-y += remoteproc_sysfs.o
>> -remoteproc-y += remoteproc_virtio.o
>> remoteproc-y += remoteproc_elf_loader.o
>> +obj-$(CONFIG_REMOTEPROC_VIRTIO) += remoteproc_virtio.o
>> obj-$(CONFIG_REMOTEPROC_CDEV) += remoteproc_cdev.o
>> obj-$(CONFIG_IMX_REMOTEPROC) += imx_rproc.o
>> obj-$(CONFIG_INGENIC_VPU_RPROC) += ingenic_rproc.o
>> diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
>> index 152fe2e8668a..4ce012c353c0 100644
>> --- a/drivers/remoteproc/remoteproc_internal.h
>> +++ b/drivers/remoteproc/remoteproc_internal.h
>> @@ -30,10 +30,38 @@ int rproc_of_parse_firmware(struct device *dev, int index,
>> const char **fw_name);
>>
>> /* from remoteproc_virtio.c */
>> +#if IS_ENABLED(CONFIG_REMOTEPROC_VIRTIO)
>> +
>> int rproc_rvdev_add_device(struct rproc_vdev *rvdev);
>> irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int vq_id);
>> void rproc_vdev_release(struct kref *ref);
>>
>> +#else
>> +
>> +int rproc_rvdev_add_device(struct rproc_vdev *rvdev)
>> +{
>> + /* This shouldn't be possible */
>> + WARN_ON(1);
>> +
>> + return -ENXIO;
>> +}
>> +
>> +static inline irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int vq_id)
>> +{
>> + /* This shouldn't be possible */
>> + WARN_ON(1);
>> +
>> + return IRQ_NONE;
>> +}
>> +
>> +static inline void rproc_vdev_release(struct kref *ref)
>> +{
>> + /* This shouldn't be possible */
>> + WARN_ON(1);
>> +}
>> +
>> +#endif
>> +
>> /* from remoteproc_debugfs.c */
>> void rproc_remove_trace_file(struct dentry *tfile);
>> struct dentry *rproc_create_trace_file(const char *name, struct rproc *rproc,
>> --
>> 2.17.1
>>

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