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Message-ID: <20210717140448.GA800975@roeck-us.net>
Date: Sat, 17 Jul 2021 07:04:48 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Eddie James <eajames@...ux.ibm.com>
Cc: linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
linux-fsi@...ts.ozlabs.org, jdelvare@...e.com, jk@...abs.org,
joel@....id.au, alistair@...ple.id.au, openbmc@...ts.ozlabs.org
Subject: Re: [PATCH 2/3] hwmon: (occ) Remove sequence numbering and checksum
calculation
On Fri, Jul 16, 2021 at 10:18:49AM -0500, Eddie James wrote:
> Checksumming of the request and sequence numbering is now done in the
> OCC interface driver in order to keep unique sequence numbers. So
> remove those in the hwmon driver.
>
> Signed-off-by: Eddie James <eajames@...ux.ibm.com>
Acked-by: Guenter Roeck <linux@...ck-us.net>
> ---
> drivers/hwmon/occ/common.c | 30 ++++++++++++------------------
> drivers/hwmon/occ/common.h | 3 +--
> drivers/hwmon/occ/p8_i2c.c | 15 +++++++++------
> drivers/hwmon/occ/p9_sbe.c | 4 ++--
> 4 files changed, 24 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/hwmon/occ/common.c b/drivers/hwmon/occ/common.c
> index 0d68a78be980..fc298268c89e 100644
> --- a/drivers/hwmon/occ/common.c
> +++ b/drivers/hwmon/occ/common.c
> @@ -132,22 +132,20 @@ struct extended_sensor {
> static int occ_poll(struct occ *occ)
> {
> int rc;
> - u16 checksum = occ->poll_cmd_data + occ->seq_no + 1;
> - u8 cmd[8];
> + u8 cmd[7];
> struct occ_poll_response_header *header;
>
> /* big endian */
> - cmd[0] = occ->seq_no++; /* sequence number */
> + cmd[0] = 0; /* sequence number */
> cmd[1] = 0; /* cmd type */
> cmd[2] = 0; /* data length msb */
> cmd[3] = 1; /* data length lsb */
> cmd[4] = occ->poll_cmd_data; /* data */
> - cmd[5] = checksum >> 8; /* checksum msb */
> - cmd[6] = checksum & 0xFF; /* checksum lsb */
> - cmd[7] = 0;
> + cmd[5] = 0; /* checksum msb */
> + cmd[6] = 0; /* checksum lsb */
>
> /* mutex should already be locked if necessary */
> - rc = occ->send_cmd(occ, cmd);
> + rc = occ->send_cmd(occ, cmd, sizeof(cmd));
> if (rc) {
> occ->last_error = rc;
> if (occ->error_count++ > OCC_ERROR_COUNT_THRESHOLD)
> @@ -184,25 +182,23 @@ static int occ_set_user_power_cap(struct occ *occ, u16 user_power_cap)
> {
> int rc;
> u8 cmd[8];
> - u16 checksum = 0x24;
> __be16 user_power_cap_be = cpu_to_be16(user_power_cap);
>
> - cmd[0] = 0;
> - cmd[1] = 0x22;
> - cmd[2] = 0;
> - cmd[3] = 2;
> + cmd[0] = 0; /* sequence number */
> + cmd[1] = 0x22; /* cmd type */
> + cmd[2] = 0; /* data length msb */
> + cmd[3] = 2; /* data length lsb */
>
> memcpy(&cmd[4], &user_power_cap_be, 2);
>
> - checksum += cmd[4] + cmd[5];
> - cmd[6] = checksum >> 8;
> - cmd[7] = checksum & 0xFF;
> + cmd[6] = 0; /* checksum msb */
> + cmd[7] = 0; /* checksum lsb */
>
> rc = mutex_lock_interruptible(&occ->lock);
> if (rc)
> return rc;
>
> - rc = occ->send_cmd(occ, cmd);
> + rc = occ->send_cmd(occ, cmd, sizeof(cmd));
>
> mutex_unlock(&occ->lock);
>
> @@ -1151,8 +1147,6 @@ int occ_setup(struct occ *occ, const char *name)
> {
> int rc;
>
> - /* start with 1 to avoid false match with zero-initialized SRAM buffer */
> - occ->seq_no = 1;
> mutex_init(&occ->lock);
> occ->groups[0] = &occ->group;
>
> diff --git a/drivers/hwmon/occ/common.h b/drivers/hwmon/occ/common.h
> index e6df719770e8..5020117be740 100644
> --- a/drivers/hwmon/occ/common.h
> +++ b/drivers/hwmon/occ/common.h
> @@ -95,9 +95,8 @@ struct occ {
> struct occ_sensors sensors;
>
> int powr_sample_time_us; /* average power sample time */
> - u8 seq_no;
> u8 poll_cmd_data; /* to perform OCC poll command */
> - int (*send_cmd)(struct occ *occ, u8 *cmd);
> + int (*send_cmd)(struct occ *occ, u8 *cmd, size_t len);
>
> unsigned long next_update;
> struct mutex lock; /* lock OCC access */
> diff --git a/drivers/hwmon/occ/p8_i2c.c b/drivers/hwmon/occ/p8_i2c.c
> index 0cf8588be35a..22af189eafa6 100644
> --- a/drivers/hwmon/occ/p8_i2c.c
> +++ b/drivers/hwmon/occ/p8_i2c.c
> @@ -97,18 +97,21 @@ static int p8_i2c_occ_putscom_u32(struct i2c_client *client, u32 address,
> }
>
> static int p8_i2c_occ_putscom_be(struct i2c_client *client, u32 address,
> - u8 *data)
> + u8 *data, size_t len)
> {
> - __be32 data0, data1;
> + __be32 data0 = 0, data1 = 0;
>
> - memcpy(&data0, data, 4);
> - memcpy(&data1, data + 4, 4);
> + memcpy(&data0, data, min(len, 4UL));
> + if (len > 4UL) {
> + len -= 4;
> + memcpy(&data1, data + 4, min(len, 4UL));
> + }
>
> return p8_i2c_occ_putscom_u32(client, address, be32_to_cpu(data0),
> be32_to_cpu(data1));
> }
>
> -static int p8_i2c_occ_send_cmd(struct occ *occ, u8 *cmd)
> +static int p8_i2c_occ_send_cmd(struct occ *occ, u8 *cmd, size_t len)
> {
> int i, rc;
> unsigned long start;
> @@ -127,7 +130,7 @@ static int p8_i2c_occ_send_cmd(struct occ *occ, u8 *cmd)
> return rc;
>
> /* write command (expected to already be BE), we need bus-endian... */
> - rc = p8_i2c_occ_putscom_be(client, OCB_DATA3, cmd);
> + rc = p8_i2c_occ_putscom_be(client, OCB_DATA3, cmd, len);
> if (rc)
> return rc;
>
> diff --git a/drivers/hwmon/occ/p9_sbe.c b/drivers/hwmon/occ/p9_sbe.c
> index f6387cc0b754..9709f2b9c052 100644
> --- a/drivers/hwmon/occ/p9_sbe.c
> +++ b/drivers/hwmon/occ/p9_sbe.c
> @@ -16,14 +16,14 @@ struct p9_sbe_occ {
>
> #define to_p9_sbe_occ(x) container_of((x), struct p9_sbe_occ, occ)
>
> -static int p9_sbe_occ_send_cmd(struct occ *occ, u8 *cmd)
> +static int p9_sbe_occ_send_cmd(struct occ *occ, u8 *cmd, size_t len)
> {
> struct occ_response *resp = &occ->resp;
> struct p9_sbe_occ *ctx = to_p9_sbe_occ(occ);
> size_t resp_len = sizeof(*resp);
> int rc;
>
> - rc = fsi_occ_submit(ctx->sbe, cmd, 8, resp, &resp_len);
> + rc = fsi_occ_submit(ctx->sbe, cmd, len, resp, &resp_len);
> if (rc < 0)
> return rc;
>
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