Re: [RFC PATCH 03/11] firmware: arm_scmi: Add support for notifications message processing

Cristian Marussi
2020-01-23T10:58:39Z

Hi Jim

On 22/01/2020 23:27, Jim Quinlan wrote:
> Hi,
>
> I tried "git am" on an mbox file  from these commits and get stuck on
>
> Applying: firmware: arm_scmi: Add receive buffer support for notifications
> Applying: firmware: arm_scmi: Update protocol commands and notification list
> Applying: firmware: arm_scmi: Add support for notifications message processing
> error: patch failed: drivers/firmware/arm_scmi/driver.c:355
> error: drivers/firmware/arm_scmi/driver.c: patch does not apply
>
>
> Could you please apply this email patchset and let me know if it works for you?  I am doing this onto
>
> 257d0e20ec4f include: trace: Add SCMI header with trace events
>
>

Sorry... my fault .. it is on top of the following commit on that same branch in fact:

729d3530a504 drivers: firmware: scmi: Extend SCMI transport layer by trace events

10:51 $ git am patch_scmi_notif/ext_V1/final/00*
Applying: firmware: arm_scmi: Add receive buffer support for notifications
Applying: firmware: arm_scmi: Update protocol commands and notification list
Applying: firmware: arm_scmi: Add support for notifications message processing
Applying: firmware: arm_scmi: Add core notifications support
Applying: firmware: arm_scmi: Add notifications anti-tampering
Applying: firmware: arm_scmi: Enable core notifications
Applying: firmware: arm_scmi: Add Power notifications support
Applying: firmware: arm_scmi: Add Perf notifications support
Applying: firmware: arm_scmi: Add Sensor notifications support
Applying: firmware: arm_scmi: Add Reset notifications support
Applying: firmware: arm_scmi: Add Base notifications support

I'll follow up to my cover to warn about this.

Thanks for trying it out.

Regards

Cristian

> as you directed.
>
> Thanks,
> Jim
>
>
>
> On 1/20/20 7:23 AM, Cristian Marussi wrote:
>> From: Sudeep Holla <sudeep.holla@arm.com>
>>
>> Add the mechanisms to distinguish notifications from delayed responses and
>> to properly fetch notification messages upon reception: notifications
>> processing does not continue further after the fetch phase.
>>
>> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
>> Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
>> ---
>> drivers/firmware/arm_scmi/driver.c | 92 +++++++++++++++++++++---------
>> 1 file changed, 65 insertions(+), 27 deletions(-)
>>
>> diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
>> index 9611e8037d77..28ed1f0cb417 100644
>> --- a/drivers/firmware/arm_scmi/driver.c
>> +++ b/drivers/firmware/arm_scmi/driver.c
>> @@ -212,6 +212,15 @@ static void scmi_fetch_response(struct scmi_xfer *xfer,
>> memcpy_fromio(xfer->rx.buf, mem->msg_payload + 4, xfer->rx.len);
>> }
>>
>> +static void scmi_fetch_notification(struct scmi_xfer *xfer, size_t max_len,
>> + struct scmi_shared_mem __iomem *mem)
>> +{
>> + /* Skip only length of header in payload area i.e 4 bytes */
>> + xfer->rx.len = min_t(size_t, max_len, ioread32(&mem->length) - 4);
>> +
>> + memcpy_fromio(xfer->rx.buf, mem->msg_payload, xfer->rx.len);
>> +}
>> +
>> /**
>> * pack_scmi_header() - packs and returns 32-bit header
>> *
>> @@ -339,6 +348,58 @@ __scmi_xfer_put(struct scmi_xfers_info *minfo, struct scmi_xfer *xfer)
>> spin_unlock_irqrestore(&minfo->xfer_lock, flags);
>> }
>>
>> +static void scmi_handle_notification(struct scmi_chan_info *cinfo, u32 msg_hdr)
>> +{
>> + struct scmi_xfer *xfer;
>> + struct device *dev = cinfo->dev;
>> + struct scmi_info *info = handle_to_scmi_info(cinfo->handle);
>> + struct scmi_xfers_info *minfo = &info->rx_minfo;
>> + struct scmi_shared_mem __iomem *mem = cinfo->payload;
>> +
>> + xfer = scmi_xfer_get(cinfo->handle, minfo);
>> + if (IS_ERR(xfer)) {
>> + dev_err(dev, "failed to get free message slot (%ld)\n",
>> + PTR_ERR(xfer));
>> + iowrite32(SCMI_SHMEM_CHAN_STAT_CHANNEL_FREE,
>> + &mem->channel_status);
>> + return;
>> + }
>> +
>> + unpack_scmi_header(msg_hdr, &xfer->hdr);
>> + scmi_dump_header_dbg(dev, &xfer->hdr);
>> + scmi_fetch_notification(xfer, info->desc->max_msg_size, mem);
>> + __scmi_xfer_put(minfo, xfer);
>> +
>> + iowrite32(SCMI_SHMEM_CHAN_STAT_CHANNEL_FREE, &mem->channel_status);
>> +}
>> +
>> +static void scmi_handle_xfer_delayed_resp(struct scmi_chan_info *cinfo,
>> + u16 xfer_id, bool delayed_resp)
>> +{
>> + struct scmi_xfer *xfer;
>> + struct device *dev = cinfo->dev;
>> + struct scmi_info *info = handle_to_scmi_info(cinfo->handle);
>> + struct scmi_xfers_info *minfo = &info->tx_minfo;
>> + struct scmi_shared_mem __iomem *mem = cinfo->payload;
>> +
>> + /* Are we even expecting this? */
>> + if (!test_bit(xfer_id, minfo->xfer_alloc_table)) {
>> + dev_err(dev, "message for %d is not expected!\n", xfer_id);
>> + return;
>> + }
>> +
>> + xfer = &minfo->xfer_block[xfer_id];
>> +
>> + scmi_dump_header_dbg(dev, &xfer->hdr);
>> +
>> + scmi_fetch_response(xfer, mem);
>> +
>> + if (delayed_resp)
>> + complete(xfer->async_done);
>> + else
>> + complete(&xfer->done);
>> +}
>> +
>> /**
>> * scmi_rx_callback() - mailbox client callback for receive messages
>> *
>> @@ -355,41 +416,18 @@ static void scmi_rx_callback(struct mbox_client *cl, void *m)
>> {
>> u8 msg_type;
>> u32 msg_hdr;
>> - u16 xfer_id;
>> - struct scmi_xfer *xfer;
>> struct scmi_chan_info *cinfo = client_to_scmi_chan_info(cl);
>> - struct device *dev = cinfo->dev;
>> - struct scmi_info *info = handle_to_scmi_info(cinfo->handle);
>> - struct scmi_xfers_info *minfo = &info->tx_minfo;
>> struct scmi_shared_mem __iomem *mem = cinfo->payload;
>>
>> msg_hdr = ioread32(&mem->msg_header);
>> msg_type = MSG_XTRACT_TYPE(msg_hdr);
>> - xfer_id = MSG_XTRACT_TOKEN(msg_hdr);
>>
>> if (msg_type == MSG_TYPE_NOTIFICATION)
>> - return; /* Notifications not yet supported */
>> -
>> - /* Are we even expecting this? */
>> - if (!test_bit(xfer_id, minfo->xfer_alloc_table)) {
>> - dev_err(dev, "message for %d is not expected!\n", xfer_id);
>> - return;
>> - }
>> -
>> - xfer = &minfo->xfer_block[xfer_id];
>> -
>> - scmi_dump_header_dbg(dev, &xfer->hdr);
>> -
>> - scmi_fetch_response(xfer, mem);
>> -
>> - trace_scmi_rx_done(xfer->transfer_id, xfer->hdr.id,
>> - xfer->hdr.protocol_id, xfer->hdr.seq,
>> - msg_type);
>> -
>> - if (msg_type == MSG_TYPE_DELAYED_RESP)
>> - complete(xfer->async_done);
>> + scmi_handle_notification(cinfo, msg_hdr);
>> else
>> - complete(&xfer->done);
>> + scmi_handle_xfer_delayed_resp(cinfo, MSG_XTRACT_TOKEN(msg_hdr),
>> + msg_type);
>> +
>> }
>>
>> /**
>
>