From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
To: "David E. Box" <david.e.box@linux.intel.com>,
rajvi.jingar@linux.intel.com,
platform-driver-x86@vger.kernel.org,
linux-kernel@vger.kernel.org, hdegoede@redhat.com,
ilpo.jarvinen@linux.intel.com
Subject: Re: [PATCH V2 2/9] platform/x86/intel/sdsi: Combine read and write mailbox flows
Date: Wed, 28 Feb 2024 12:45:50 -0800 [thread overview]
Message-ID: <b78900e9-729d-4c64-9f3b-79a260322df4@linux.intel.com> (raw)
In-Reply-To: <20240228000016.1685518-3-david.e.box@linux.intel.com>
On 2/27/24 4:00 PM, David E. Box wrote:
> The current mailbox commands are either read-only or write-only and the
> flow is different for each. New commands will need to send and receive
> data. In preparation for these commands, create a common polling function
> to handle sending data and receiving in the same transaction.
>
> Signed-off-by: David E. Box <david.e.box@linux.intel.com>
> ---
Looks good to me.
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
> V2 - In sdsi_cmd_read() remove unnecessary check for non-zero packet_size
> in do loop since the loop is exited earlier when packet_size is
> zero.
>
> drivers/platform/x86/intel/sdsi.c | 79 +++++++++++++++++--------------
> 1 file changed, 44 insertions(+), 35 deletions(-)
>
> diff --git a/drivers/platform/x86/intel/sdsi.c b/drivers/platform/x86/intel/sdsi.c
> index a70c071de6e2..d80c2dc0ce71 100644
> --- a/drivers/platform/x86/intel/sdsi.c
> +++ b/drivers/platform/x86/intel/sdsi.c
> @@ -15,6 +15,7 @@
> #include <linux/iopoll.h>
> #include <linux/kernel.h>
> #include <linux/module.h>
> +#include <linux/overflow.h>
> #include <linux/pci.h>
> #include <linux/slab.h>
> #include <linux/sysfs.h>
> @@ -156,8 +157,8 @@ static int sdsi_status_to_errno(u32 status)
> }
> }
>
> -static int sdsi_mbox_cmd_read(struct sdsi_priv *priv, struct sdsi_mbox_info *info,
> - size_t *data_size)
> +static int sdsi_mbox_poll(struct sdsi_priv *priv, struct sdsi_mbox_info *info,
> + size_t *data_size)
> {
> struct device *dev = priv->dev;
> u32 total, loop, eom, status, message_size;
> @@ -166,18 +167,10 @@ static int sdsi_mbox_cmd_read(struct sdsi_priv *priv, struct sdsi_mbox_info *inf
>
> lockdep_assert_held(&priv->mb_lock);
>
> - /* Format and send the read command */
> - control = FIELD_PREP(CTRL_EOM, 1) |
> - FIELD_PREP(CTRL_SOM, 1) |
> - FIELD_PREP(CTRL_RUN_BUSY, 1) |
> - FIELD_PREP(CTRL_PACKET_SIZE, info->size);
> - writeq(control, priv->control_addr);
> -
> /* For reads, data sizes that are larger than the mailbox size are read in packets. */
> total = 0;
> loop = 0;
> do {
> - void *buf = info->buffer + (SDSI_SIZE_MAILBOX * loop);
> u32 packet_size;
>
> /* Poll on ready bit */
> @@ -195,6 +188,11 @@ static int sdsi_mbox_cmd_read(struct sdsi_priv *priv, struct sdsi_mbox_info *inf
> if (ret)
> break;
>
> + if (!packet_size) {
> + sdsi_complete_transaction(priv);
> + break;
> + }
> +
> /* Only the last packet can be less than the mailbox size. */
> if (!eom && packet_size != SDSI_SIZE_MAILBOX) {
> dev_err(dev, "Invalid packet size\n");
> @@ -208,9 +206,13 @@ static int sdsi_mbox_cmd_read(struct sdsi_priv *priv, struct sdsi_mbox_info *inf
> break;
> }
>
> - sdsi_memcpy64_fromio(buf, priv->mbox_addr, round_up(packet_size, SDSI_SIZE_CMD));
> + if (info->buffer) {
> + void *buf = info->buffer + array_size(SDSI_SIZE_MAILBOX, loop);
>
> - total += packet_size;
> + sdsi_memcpy64_fromio(buf, priv->mbox_addr,
> + round_up(packet_size, SDSI_SIZE_CMD));
> + total += packet_size;
> + }
>
> sdsi_complete_transaction(priv);
> } while (!eom && ++loop < MBOX_MAX_PACKETS);
> @@ -230,16 +232,33 @@ static int sdsi_mbox_cmd_read(struct sdsi_priv *priv, struct sdsi_mbox_info *inf
> dev_warn(dev, "Read count %u differs from expected count %u\n",
> total, message_size);
>
> - *data_size = total;
> + if (data_size)
> + *data_size = total;
>
> return 0;
> }
>
> -static int sdsi_mbox_cmd_write(struct sdsi_priv *priv, struct sdsi_mbox_info *info)
> +static int sdsi_mbox_cmd_read(struct sdsi_priv *priv, struct sdsi_mbox_info *info,
> + size_t *data_size)
> +{
> + u64 control;
> +
> + lockdep_assert_held(&priv->mb_lock);
> +
> + /* Format and send the read command */
> + control = FIELD_PREP(CTRL_EOM, 1) |
> + FIELD_PREP(CTRL_SOM, 1) |
> + FIELD_PREP(CTRL_RUN_BUSY, 1) |
> + FIELD_PREP(CTRL_PACKET_SIZE, info->size);
> + writeq(control, priv->control_addr);
> +
> + return sdsi_mbox_poll(priv, info, data_size);
> +}
> +
> +static int sdsi_mbox_cmd_write(struct sdsi_priv *priv, struct sdsi_mbox_info *info,
> + size_t *data_size)
> {
> u64 control;
> - u32 status;
> - int ret;
>
> lockdep_assert_held(&priv->mb_lock);
>
> @@ -256,20 +275,7 @@ static int sdsi_mbox_cmd_write(struct sdsi_priv *priv, struct sdsi_mbox_info *in
> FIELD_PREP(CTRL_PACKET_SIZE, info->size);
> writeq(control, priv->control_addr);
>
> - /* Poll on ready bit */
> - ret = readq_poll_timeout(priv->control_addr, control, control & CTRL_READY,
> - MBOX_POLLING_PERIOD_US, MBOX_TIMEOUT_US);
> -
> - if (ret)
> - goto release_mbox;
> -
> - status = FIELD_GET(CTRL_STATUS, control);
> - ret = sdsi_status_to_errno(status);
> -
> -release_mbox:
> - sdsi_complete_transaction(priv);
> -
> - return ret;
> + return sdsi_mbox_poll(priv, info, data_size);
> }
>
> static int sdsi_mbox_acquire(struct sdsi_priv *priv, struct sdsi_mbox_info *info)
> @@ -313,7 +319,8 @@ static int sdsi_mbox_acquire(struct sdsi_priv *priv, struct sdsi_mbox_info *info
> return ret;
> }
>
> -static int sdsi_mbox_write(struct sdsi_priv *priv, struct sdsi_mbox_info *info)
> +static int sdsi_mbox_write(struct sdsi_priv *priv, struct sdsi_mbox_info *info,
> + size_t *data_size)
> {
> int ret;
>
> @@ -323,7 +330,7 @@ static int sdsi_mbox_write(struct sdsi_priv *priv, struct sdsi_mbox_info *info)
> if (ret)
> return ret;
>
> - return sdsi_mbox_cmd_write(priv, info);
> + return sdsi_mbox_cmd_write(priv, info, data_size);
> }
>
> static int sdsi_mbox_read(struct sdsi_priv *priv, struct sdsi_mbox_info *info, size_t *data_size)
> @@ -342,7 +349,7 @@ static int sdsi_mbox_read(struct sdsi_priv *priv, struct sdsi_mbox_info *info, s
> static ssize_t sdsi_provision(struct sdsi_priv *priv, char *buf, size_t count,
> enum sdsi_command command)
> {
> - struct sdsi_mbox_info info;
> + struct sdsi_mbox_info info = {};
> int ret;
>
> if (count > (SDSI_SIZE_WRITE_MSG - SDSI_SIZE_CMD))
> @@ -364,7 +371,9 @@ static ssize_t sdsi_provision(struct sdsi_priv *priv, char *buf, size_t count,
> ret = mutex_lock_interruptible(&priv->mb_lock);
> if (ret)
> goto free_payload;
> - ret = sdsi_mbox_write(priv, &info);
> +
> + ret = sdsi_mbox_write(priv, &info, NULL);
> +
> mutex_unlock(&priv->mb_lock);
>
> free_payload:
> @@ -408,7 +417,7 @@ static ssize_t
> certificate_read(u64 command, struct sdsi_priv *priv, char *buf, loff_t off,
> size_t count)
> {
> - struct sdsi_mbox_info info;
> + struct sdsi_mbox_info info = {};
> size_t size;
> int ret;
>
--
Sathyanarayanan Kuppuswamy
Linux Kernel Developer
next prev parent reply other threads:[~2024-02-28 20:45 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-28 0:00 [PATCH V2 0/9] Intel On Demand changes David E. Box
2024-02-28 0:00 ` [PATCH V2 1/9] platform/x86/intel/sdsi: Set message size during writes David E. Box
2024-02-28 2:34 ` Kuppuswamy Sathyanarayanan
2024-02-28 0:00 ` [PATCH V2 2/9] platform/x86/intel/sdsi: Combine read and write mailbox flows David E. Box
2024-02-28 2:38 ` Kuppuswamy Sathyanarayanan
2024-02-28 18:10 ` David E. Box
2024-03-04 13:25 ` Ilpo Järvinen
2024-02-28 20:45 ` Kuppuswamy Sathyanarayanan [this message]
2024-02-28 0:00 ` [PATCH V2 3/9] platform/x86/intel/sdsi: Add in-band BIOS lock support David E. Box
2024-03-04 13:26 ` Ilpo Järvinen
2024-02-28 0:00 ` [PATCH V2 4/9] platform/x86/intel/sdsi: Add attribute to read the current meter state David E. Box
2024-02-28 2:41 ` Kuppuswamy Sathyanarayanan
2024-03-04 13:29 ` Ilpo Järvinen
2024-02-28 0:00 ` [PATCH V2 5/9] tools/arch/x86/intel_sdsi: Fix maximum meter bundle length David E. Box
2024-02-28 2:54 ` Kuppuswamy Sathyanarayanan
2024-02-28 0:00 ` [PATCH V2 6/9] tools/arch/x86/intel_sdsi: Add missing version field David E. Box
2024-02-28 2:57 ` Kuppuswamy Sathyanarayanan
2024-02-28 0:00 ` [PATCH V2 7/9] tools/arch/x86/intel_sdsi: Fix meter_certificate decoding David E. Box
2024-02-28 2:58 ` Kuppuswamy Sathyanarayanan
2024-03-04 13:32 ` Ilpo Järvinen
2024-02-28 0:00 ` [PATCH V2 8/9] platform/x86/intel/sdsi: Simplify ascii printing David E. Box
2024-02-28 2:59 ` Kuppuswamy Sathyanarayanan
2024-02-28 0:00 ` [PATCH V2 9/9] tools: intel_sdsi: Add current meter support David E. Box
2024-02-28 3:31 ` Kuppuswamy Sathyanarayanan
2024-03-04 13:34 ` Ilpo Järvinen
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