linux-kernel - Re: [PATCH v2 1/2] drivers: qcom: add command DB driver

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Message-ID: <20180208211212.GA7084@codeaurora.org>
Date:   Thu, 8 Feb 2018 21:12:12 +0000
From:   Lina Iyer <ilina@...eaurora.org>
To:     andy.gross@...aro.org, david.brown@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        sboyd@...eaurora.org, rnayak@...eaurora.org,
        msivasub@...eaurora.org, bjorn.andersson@...aro.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] drivers: qcom: add command DB driver

On Thu, Feb 08 2018 at 20:48 +0000, Jordan Crouse wrote:
>On Thu, Feb 08, 2018 at 12:51:53PM -0700, Lina Iyer wrote:
>> From: Mahesh Sivasubramanian <msivasub@...eaurora.org>
>>
>> Command DB is a simple database in the shared memory of QCOM SoCs, that
>> provides information regarding shared resources. Some shared resources
>> in the SoC have properties that are probed dynamically at boot by the
>> remote processor. The information pertaining to the SoC and the platform
>> are made available in the shared memory. Drivers can query this
>> information using predefined strings.
>>
>> Signed-off-by: Mahesh Sivasubramanian <msivasub@...eaurora.org>
>> Signed-off-by: Lina Iyer <ilina@...eaurora.org>
>> ---
>
>*snip*
>
>> diff --git a/drivers/soc/qcom/cmd-db.c b/drivers/soc/qcom/cmd-db.c
>> new file mode 100644
>> index 000000000000..050a56da76c8
>> --- /dev/null
>> +++ b/drivers/soc/qcom/cmd-db.c
>> @@ -0,0 +1,321 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved. */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/of.h>
>> +#include <linux/of_address.h>
>> +#include <linux/of_platform.h>
>> +#include <linux/of_reserved_mem.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/types.h>
>> +
>> +#include <soc/qcom/cmd-db.h>
>> +
>> +#define NUM_PRIORITY		2
>> +#define MAX_SLV_ID		8
>> +#define CMD_DB_MAGIC		0x0C0330DBUL
>> +#define SLAVE_ID_MASK		0x7
>> +#define SLAVE_ID_SHIFT		16
>> +
>> +#define ENTRY_HEADER(hdr)	((void *)cmd_db_header +	\
>> +				sizeof(*cmd_db_header) +	\
>> +				hdr->header_offset)
>> +
>> +#define RSC_OFFSET(hdr, ent)	((void *)cmd_db_header +	\
>> +				sizeof(*cmd_db_header) +	\
>> +				hdr.data_offset + ent.offset)
>> +
>> +#define MIN(a, b)		(((a) < (b)) ? (a) : (b))
>
>I'm not sure if this was addressed before. Why use a custom macro and not min()
>or min_t()?
>
I didn't realize the existance of this. cscope brought out a ton of 'min' defn.
Will fix in the next spin.

Thanks,
Lina