Re: [RFC PATCH 20/97] drm/i915/guc: Introduce unified HXG messages

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On 11.05.2021 17:16, Daniel Vetter wrote:
> On Thu, May 06, 2021 at 12:13:34PM -0700, Matthew Brost wrote:
>> From: Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx>
>>
>> New GuC firmware will unify format of MMIO and CTB H2G messages.
>> Introduce their definitions now to allow gradual transition of
>> our code to match new changes.
>>
>> Signed-off-by: Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx>
>> Signed-off-by: Matthew Brost <matthew.brost@xxxxxxxxx>
>> Cc: Michał Winiarski <michal.winiarski@xxxxxxxxx>
>> ---
>>  .../gpu/drm/i915/gt/uc/abi/guc_messages_abi.h | 226 ++++++++++++++++++
>>  1 file changed, 226 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/i915/gt/uc/abi/guc_messages_abi.h b/drivers/gpu/drm/i915/gt/uc/abi/guc_messages_abi.h
>> index 775e21f3058c..1c264819aa03 100644
>> --- a/drivers/gpu/drm/i915/gt/uc/abi/guc_messages_abi.h
>> +++ b/drivers/gpu/drm/i915/gt/uc/abi/guc_messages_abi.h
>> @@ -6,6 +6,232 @@
>>  #ifndef _ABI_GUC_MESSAGES_ABI_H
>>  #define _ABI_GUC_MESSAGES_ABI_H
>>  
>> +/**
>> + * DOC: HXG Message
> 
> These aren't useful if we don't pull them in somewhere in the
> Documentation/gpu hierarchy. General comment, and also please check that
> it all renders correctly still.

Patch that connects all these DOC sections into i915.rst is still on
private branch, where I'm trying to verify all html rendering, and ...

> 
> btw if you respin a patch not originally by you we generally add a (v1) to
> the original s-o-b line (or whever the version split was) and explain in
> the usual changelog in the commit message what was changed.
> 
> This holds for the entire series ofc.
> -Daniel
> 
>> + *
>> + * All messages exchanged with GuC are defined using 32 bit dwords.
>> + * First dword is treated as a message header. Remaining dwords are optional.
>> + *
>> + * .. _HXG Message:

where such workarounds from early documentation are already removed,
since they are not needed any more starting from commit ef09989594bf
("scripts/kernel-doc: add internal hyperlink to DOC: sections")

Michal

>> + *
>> + *  +---+-------+--------------------------------------------------------------+
>> + *  |   | Bits  | Description                                                  |
>> + *  +===+=======+==============================================================+
>> + *  |   |       |                                                              |
>> + *  | 0 |    31 | **ORIGIN** - originator of the message                       |
>> + *  |   |       |   - _`GUC_HXG_ORIGIN_HOST` = 0                               |
>> + *  |   |       |   - _`GUC_HXG_ORIGIN_GUC` = 1                                |
>> + *  |   |       |                                                              |
>> + *  |   +-------+--------------------------------------------------------------+
>> + *  |   | 30:28 | **TYPE** - message type                                      |
>> + *  |   |       |   - _`GUC_HXG_TYPE_REQUEST` = 0                              |
>> + *  |   |       |   - _`GUC_HXG_TYPE_EVENT` = 1                                |
>> + *  |   |       |   - _`GUC_HXG_TYPE_NO_RESPONSE_BUSY` = 3                     |
>> + *  |   |       |   - _`GUC_HXG_TYPE_NO_RESPONSE_RETRY` = 5                    |
>> + *  |   |       |   - _`GUC_HXG_TYPE_RESPONSE_FAILURE` = 6                     |
>> + *  |   |       |   - _`GUC_HXG_TYPE_RESPONSE_SUCCESS` = 7                     |
>> + *  |   +-------+--------------------------------------------------------------+
>> + *  |   |  27:0 | **AUX** - auxiliary data (depends TYPE)                      |
>> + *  +---+-------+--------------------------------------------------------------+
>> + *  | 1 |  31:0 | optional payload (depends on TYPE)                           |
>> + *  +---+-------+                                                              |
>> + *  |...|       |                                                              |
>> + *  +---+-------+                                                              |
>> + *  | n |  31:0 |                                                              |
>> + *  +---+-------+--------------------------------------------------------------+
>> + */
>> +
>> +#define GUC_HXG_MSG_MIN_LEN			1u
>> +#define GUC_HXG_MSG_0_ORIGIN			(0x1 << 31)
>> +#define   GUC_HXG_ORIGIN_HOST			0u
>> +#define   GUC_HXG_ORIGIN_GUC			1u
>> +#define GUC_HXG_MSG_0_TYPE			(0x7 << 28)
>> +#define   GUC_HXG_TYPE_REQUEST			0u
>> +#define   GUC_HXG_TYPE_EVENT			1u
>> +#define   GUC_HXG_TYPE_NO_RESPONSE_BUSY		3u
>> +#define   GUC_HXG_TYPE_NO_RESPONSE_RETRY	5u
>> +#define   GUC_HXG_TYPE_RESPONSE_FAILURE		6u
>> +#define   GUC_HXG_TYPE_RESPONSE_SUCCESS		7u
>> +#define GUC_HXG_MSG_0_AUX			(0xfffffff << 0)
>> +
>> +/**
>> + * DOC: HXG Request
>> + *
>> + * The `HXG Request`_ message should be used to initiate synchronous activity
>> + * for which confirmation or return data is expected.
>> + *
>> + * The recipient of this message shall use `HXG Response`_, `HXG Failure`_
>> + * or `HXG Retry`_ message as a definite reply, and may use `HXG Busy`_
>> + * message as a intermediate reply.
>> + *
>> + * Format of @DATA0 and all @DATAn fields depends on the @ACTION code.
>> + *
>> + * _HXG Request:
>> + *
>> + *  +---+-------+--------------------------------------------------------------+
>> + *  |   | Bits  | Description                                                  |
>> + *  +===+=======+==============================================================+
>> + *  | 0 |    31 | ORIGIN                                                       |
>> + *  |   +-------+--------------------------------------------------------------+
>> + *  |   | 30:28 | TYPE = GUC_HXG_TYPE_REQUEST_                                 |
>> + *  |   +-------+--------------------------------------------------------------+
>> + *  |   | 27:16 | **DATA0** - request data (depends on ACTION)                 |
>> + *  |   +-------+--------------------------------------------------------------+
>> + *  |   |  15:0 | **ACTION** - requested action code                           |
>> + *  +---+-------+--------------------------------------------------------------+
>> + *  | 1 |  31:0 | **DATA1** - optional data (depends on ACTION)                |
>> + *  +---+-------+--------------------------------------------------------------+
>> + *  |...|       |                                                              |
>> + *  +---+-------+--------------------------------------------------------------+
>> + *  | n |  31:0 | **DATAn** - optional data (depends on ACTION)                |
>> + *  +---+-------+--------------------------------------------------------------+
>> + */
>> +
>> +#define GUC_HXG_REQUEST_MSG_MIN_LEN		GUC_HXG_MSG_MIN_LEN
>> +#define GUC_HXG_REQUEST_MSG_0_DATA0		(0xfff << 16)
>> +#define GUC_HXG_REQUEST_MSG_0_ACTION		(0xffff << 0)
>> +#define GUC_HXG_REQUEST_MSG_n_DATAn		(0xffffffff << 0)
>> +
>> +/**
>> + * DOC: HXG Event
>> + *
>> + * The `HXG Event`_ message should be used to initiate asynchronous activity
>> + * that does not involves immediate confirmation nor data.
>> + *
>> + * Format of @DATA0 and all @DATAn fields depends on the @ACTION code.
>> + *
>> + * .. _HXG Event:
>> + *
>> + *  +---+-------+--------------------------------------------------------------+
>> + *  |   | Bits  | Description                                                  |
>> + *  +===+=======+==============================================================+
>> + *  | 0 |    31 | ORIGIN                                                       |
>> + *  |   +-------+--------------------------------------------------------------+
>> + *  |   | 30:28 | TYPE = GUC_HXG_TYPE_EVENT_                                   |
>> + *  |   +-------+--------------------------------------------------------------+
>> + *  |   | 27:16 | **DATA0** - event data (depends on ACTION)                   |
>> + *  |   +-------+--------------------------------------------------------------+
>> + *  |   |  15:0 | **ACTION** - event action code                               |
>> + *  +---+-------+--------------------------------------------------------------+
>> + *  | 1 |  31:0 | **DATA1** - optional event data (depends on ACTION)          |
>> + *  +---+-------+--------------------------------------------------------------+
>> + *  |...|       |                                                              |
>> + *  +---+-------+--------------------------------------------------------------+
>> + *  | n |  31:0 | **DATAn** - optional event  data (depends on ACTION)         |
>> + *  +---+-------+--------------------------------------------------------------+
>> + */
>> +
>> +#define GUC_HXG_EVENT_MSG_MIN_LEN		GUC_HXG_MSG_MIN_LEN
>> +#define GUC_HXG_EVENT_MSG_0_DATA0		(0xfff << 16)
>> +#define GUC_HXG_EVENT_MSG_0_ACTION		(0xffff << 0)
>> +#define GUC_HXG_EVENT_MSG_n_DATAn		(0xffffffff << 0)
>> +
>> +/**
>> + * DOC: HXG Busy
>> + *
>> + * The `HXG Busy`_ message may be used to acknowledge reception of the `HXG Request`_
>> + * message if the recipient expects that it processing will be longer than default
>> + * timeout.
>> + *
>> + * The @COUNTER field may be used as a progress indicator.
>> + *
>> + * .. _HXG Busy:
>> + *
>> + *  +---+-------+--------------------------------------------------------------+
>> + *  |   | Bits  | Description                                                  |
>> + *  +===+=======+==============================================================+
>> + *  | 0 |    31 | ORIGIN                                                       |
>> + *  |   +-------+--------------------------------------------------------------+
>> + *  |   | 30:28 | TYPE = GUC_HXG_TYPE_NO_RESPONSE_BUSY_                        |
>> + *  |   +-------+--------------------------------------------------------------+
>> + *  |   |  27:0 | **COUNTER** - progress indicator                             |
>> + *  +---+-------+--------------------------------------------------------------+
>> + */
>> +
>> +#define GUC_HXG_BUSY_MSG_LEN			GUC_HXG_MSG_MIN_LEN
>> +#define GUC_HXG_BUSY_MSG_0_COUNTER		GUC_HXG_MSG_0_AUX
>> +
>> +/**
>> + * DOC: HXG Retry
>> + *
>> + * The `HXG Retry`_ message should be used by recipient to indicate that the
>> + * `HXG Request`_ message was dropped and it should be resent again.
>> + *
>> + * The @REASON field may be used to provide additional information.
>> + *
>> + * .. _HXG Retry:
>> + *
>> + *  +---+-------+--------------------------------------------------------------+
>> + *  |   | Bits  | Description                                                  |
>> + *  +===+=======+==============================================================+
>> + *  | 0 |    31 | ORIGIN                                                       |
>> + *  |   +-------+--------------------------------------------------------------+
>> + *  |   | 30:28 | TYPE = GUC_HXG_TYPE_NO_RESPONSE_RETRY_                       |
>> + *  |   +-------+--------------------------------------------------------------+
>> + *  |   |  27:0 | **REASON** - reason for retry                                |
>> + *  |   |       |  - _`GUC_HXG_RETRY_REASON_UNSPECIFIED` = 0                   |
>> + *  +---+-------+--------------------------------------------------------------+
>> + */
>> +
>> +#define GUC_HXG_RETRY_MSG_LEN			GUC_HXG_MSG_MIN_LEN
>> +#define GUC_HXG_RETRY_MSG_0_REASON		GUC_HXG_MSG_0_AUX
>> +#define   GUC_HXG_RETRY_REASON_UNSPECIFIED	0u
>> +
>> +/**
>> + * DOC: HXG Failure
>> + *
>> + * The `HXG Failure`_ message shall be used as a reply to the `HXG Request`_
>> + * message that could not be processed due to an error.
>> + *
>> + * .. _HXG Failure:
>> + *
>> + *  +---+-------+--------------------------------------------------------------+
>> + *  |   | Bits  | Description                                                  |
>> + *  +===+=======+==============================================================+
>> + *  | 0 |    31 | ORIGIN                                                       |
>> + *  |   +-------+--------------------------------------------------------------+
>> + *  |   | 30:28 | TYPE = GUC_HXG_TYPE_RESPONSE_FAILURE_                        |
>> + *  |   +-------+--------------------------------------------------------------+
>> + *  |   | 27:16 | **HINT** - additional error hint                             |
>> + *  |   +-------+--------------------------------------------------------------+
>> + *  |   |  15:0 | **ERROR** - error/result code                                |
>> + *  +---+-------+--------------------------------------------------------------+
>> + */
>> +
>> +#define GUC_HXG_FAILURE_MSG_LEN			GUC_HXG_MSG_MIN_LEN
>> +#define GUC_HXG_FAILURE_MSG_0_HINT		(0xfff << 16)
>> +#define GUC_HXG_FAILURE_MSG_0_ERROR		(0xffff << 0)
>> +
>> +/**
>> + * DOC: HXG Response
>> + *
>> + * The `HXG Response`_ message SHALL be used as a reply to the `HXG Request`_
>> + * message that was successfully processed without an error.
>> + *
>> + * .. _HXG Response:
>> + *
>> + *  +---+-------+--------------------------------------------------------------+
>> + *  |   | Bits  | Description                                                  |
>> + *  +===+=======+==============================================================+
>> + *  | 0 |    31 | ORIGIN                                                       |
>> + *  |   +-------+--------------------------------------------------------------+
>> + *  |   | 30:28 | TYPE = GUC_HXG_TYPE_RESPONSE_SUCCESS_                        |
>> + *  |   +-------+--------------------------------------------------------------+
>> + *  |   |  27:0 | **DATA0** - data (depends on ACTION from `HXG Request`_)     |
>> + *  +---+-------+--------------------------------------------------------------+
>> + *  | 1 |  31:0 | **DATA1** - data (depends on ACTION from `HXG Request`_)     |
>> + *  +---+-------+--------------------------------------------------------------+
>> + *  |...|       |                                                              |
>> + *  +---+-------+--------------------------------------------------------------+
>> + *  | n |  31:0 | **DATAn** - data (depends on ACTION from `HXG Request`_)     |
>> + *  +---+-------+--------------------------------------------------------------+
>> + */
>> +
>> +#define GUC_HXG_RESPONSE_MSG_MIN_LEN		GUC_HXG_MSG_MIN_LEN
>> +#define GUC_HXG_RESPONSE_MSG_0_DATA0		GUC_HXG_MSG_0_AUX
>> +#define GUC_HXG_RESPONSE_MSG_n_DATAn		(0xffffffff << 0)
>> +
>> +/* deprecated */
>>  #define INTEL_GUC_MSG_TYPE_SHIFT	28
>>  #define INTEL_GUC_MSG_TYPE_MASK		(0xF << INTEL_GUC_MSG_TYPE_SHIFT)
>>  #define INTEL_GUC_MSG_DATA_SHIFT	16
>> -- 
>> 2.28.0
>>
> 



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