Re: [PATCH v2 6/7] misc: bcm-vk: add Broadcom VK driver

[Scott Branden <scott.branden@broadcom.com>]

Hi Randy,

On 2020-02-19 5:04 p.m., Randy Dunlap wrote:
> Hi,
>
> On 2/19/20 4:48 PM, Scott Branden wrote:
>> diff --git a/drivers/misc/bcm-vk/Kconfig b/drivers/misc/bcm-vk/Kconfig
>> new file mode 100644
>> index 000000000000..c75dfb89a38d
>> --- /dev/null
>> +++ b/drivers/misc/bcm-vk/Kconfig
>> @@ -0,0 +1,42 @@
>> +# SPDX-License-Identifier: GPL-2.0-only
>> +#
>> +# Broadcom VK device
>> +#
>> +config BCM_VK
>> +	tristate "Support for Broadcom VK Accelerators"
>> +	depends on PCI_MSI
>> +	default m
> Need to justify default m. Normally we don't add drivers as enabled unless
> they are required for basic (boot) operation.
Will remove default m as not needed to boot.  Interesting other offload 
engines misc/ocxl/Kconfig and misc/cxl/Kconfig have default m.
>
>> +	help
>> +	  Select this option to enable support for Broadcom
>> +	  VK Accelerators.  VK is used for performing
>> +	  specific video offload processing.  This driver enables
>> +	  userspace programs to access these accelerators via /dev/bcm-vk.N
>> +	  devices.
>> +
>> +	  If unsure, say N.
>> +
>> +if BCM_VK
>> +
>> +config BCM_VK_H2VK_VERIFY_AND_RETRY
>> +	bool "Host To VK Verifiy Data and Retry"
> 	                 Verify
>
>> +	help
>> +	  Turn on to verify the data passed down to VK is good,
>> +	  and if not, do a retry until it succeeds.
> No timeout on that retry?
This is only enabled for debug purposes or fpga workarounds - no need 
for a timeout.
>
>> +	  This is a debug/workaround on FPGA PCIe timing issues
>> +	  but may be found useful for debugging other PCIe hardware issues.
>> +	  Small performance loss by enabling this debug config.
>> +	  For properly operating PCIe hardware no need to enable this.
>> +
>> +	  If unsure, say N.
>> +
>> +config BCM_VK_QSTATS
>> +	bool "VK Queue Statistics"
>> +	help
>> +	  Turn on to enable Queue Statistics.
>> +	  These are useful for debugging purposes.
>> +	  Some performance loss by enabling this debug config.
>> +	  For properly operating PCIe hardware no need to enable this.
>> +
>> +	  If unsure, say N.
>> +
>> +endif
> cheers.