linux-kernel - Re: [PATCH] soc: qcom: cmd-db: Make endian-agnostic

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Date:   Tue, 17 Apr 2018 11:30:28 -0600
From:   Lina Iyer <ilina@...eaurora.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Andy Gross <andy.gross@...aro.org>, linux-arm-msm@...r.kernel.org,
        linux-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mahesh Sivasubramanian <msivasub@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Evan Green <evgreen@...omium.org>
Subject: Re: [PATCH] soc: qcom: cmd-db: Make endian-agnostic

On Tue, Apr 17 2018 at 11:22 -0600, Lina Iyer wrote:
>On Thu, Apr 12 2018 at 16:41 -0600, Stephen Boyd wrote:
>>This driver deals with memory that is stored in little-endian format.
>>Update the structures with the proper little-endian types and then
>>do the proper conversions when reading the fields. Note that we compare
>>the ids with a memcmp() because we already pad out the string 'id' field
>>to exactly 8 bytes with the strncpy() onto the stack.
>>
>>Cc: Mahesh Sivasubramanian <msivasub@...eaurora.org>
>>Cc: Lina Iyer <ilina@...eaurora.org>
>>Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
>>Cc: Evan Green <evgreen@...omium.org>
>>Signed-off-by: Stephen Boyd <swboyd@...omium.org>
>>---
>>
>>Changes from inline patch:
>>* Fixed magic
>>* Made function for memcmp()
>>*
>>
>>drivers/soc/qcom/cmd-db.c | 116 +++++++++++++++++++++-----------------
>>1 file changed, 65 insertions(+), 51 deletions(-)
>>
>>@@ -99,8 +90,34 @@ struct cmd_db_header {
>> * h/w accelerator and request a resource state.
>> */
>>
>>+static const char CMD_DB_MAGIC[] = { 0xdb, 0x30, 0x03, 0x0c };
>>+
>This works now.
>
>>+static bool cmd_db_magic_matches(struct cmd_db_header *header)
>>+{
>>+	__le32 *magic = &header->magic_num;
>>+
>>+	return memcmp(magic, CMD_DB_MAGIC, sizeof(CMD_DB_MAGIC)) == 0;
>>+}
>>+
>>static struct cmd_db_header *cmd_db_header;
>Could  you move this up, along with other declarations?
>>
>>+
>>+static inline void *rsc_to_entry_header(struct rsc_hdr *hdr)
>>+{
>>+	u16 offset = le16_to_cpu(hdr->header_offset);
>>+
>>+	return cmd_db_header->data + offset;
>
>I noticed that the data was incorrect, with the above and I did it to
>read the correct data.
>
Spoke too soon. Let me test more and report.
-- Lina

>return ((void*)cmd_db_header + sizeof(*cmd_db_header) + offset);
>>+}
>>+
>>+static inline void *
>>+rsc_offset(struct rsc_hdr *hdr, struct entry_header *ent)
>>+{
>>+	u16 offset = le16_to_cpu(hdr->header_offset);
>>+	u16 loffset = le16_to_cpu(ent->offset);
>>+
>>+	return cmd_db_header->data + offset + loffset;
>As well here -
>return ((void*)cmd_db_header + sizeof(*cmd_db_header) + offset +
>loffset);
>>+}
>>+
>
>Thanks,
>Lina
>