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

From: Randy Dunlap <rdunlap@infradead.org>
To: Scott Branden <scott.branden@broadcom.com>,
	Luis Chamberlain <mcgrof@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	David Brown <david.brown@linaro.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Shuah Khan <shuah@kernel.org>,
	bjorn.andersson@linaro.org,
	Shuah Khan <skhan@linuxfoundation.org>,
	Arnd Bergmann <arnd@arndb.de>
Cc: "Rafael J . Wysocki" <rafael@kernel.org>,
	linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	linux-fsdevel@vger.kernel.org,
	BCM Kernel Feedback <bcm-kernel-feedback-list@broadcom.com>,
	Olof Johansson <olof@lixom.net>,
	Andrew Morton <akpm@linux-foundation.org>,
	Dan Carpenter <dan.carpenter@oracle.com>,
	Colin Ian King <colin.king@canonical.com>,
	Kees Cook <keescook@chromium.org>, Takashi Iwai <tiwai@suse.de>,
	linux-kselftest@vger.kernel.org, Andy Gross <agross@kernel.org>,
	Desmond Yan <desmond.yan@broadcom.com>,
	James Hu <james.hu@broadcom.com>
Subject: Re: [PATCH v2 6/7] misc: bcm-vk: add Broadcom VK driver
Date: Wed, 19 Feb 2020 17:04:38 -0800	[thread overview]
Message-ID: <827a4520-95ce-5264-90d9-ed730e5918e6@infradead.org> (raw)
In-Reply-To: <20200220004825.23372-7-scott.branden@broadcom.com>

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.

> +	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 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.
-- 
~Randy