PCI/AER: Fix mapping of errors to agent & layer

PCIe r7.0 sec 6.2.7 documents the agent and layer of each Correctable and
Uncorrectable Error.  Based on this spec section, the AER driver maps
detected errors to an agent and layer using a set of macros and logs them.

Most errors listed in sec 6.2.7 map to the "Receiver" agent and
"Transaction Layer", so the macros use these as defaults unless an error
maps to something else.

However the macros have not been amended since their introduction in 2006
with commit 6c2b374d7485 ("PCI-Express AER implemetation: AER core and
aerdriver").  They are still based on PCIe r1.0 sec 7.2.5 (renumbered to
6.2.7 in PCIe r1.1 and newer).

Amend the macros to map errors introduced since then to the appropriate
agent and layer.

PCIe r2.1 introduced a new "Component" agent and "General" layer for
Internal Errors and Header Log Overflow.  Add them to the macros.

Unsupported Request is currently mapped to the "Requester" agent, even
though it is reported by the "Receiver".  Fix the incorrect mapping.

Sec 6.2.7 neglects to list an agent for Data Link Protocol Error and
Surprise Down Error.  Map the latter to "Component" because PCIe r7.0 sec
3.2.1 states that the error is "associated with the detecting Port".  Map
the former to "Receiver" because every occurrence of Data Link Protocol
Error in the spec refers to it being logged in the Receiving Port.  I have
had these errata reported to the PCI-SIG Protocol Working Group.  (There's
also a layout erratum in the REPLAY_NUM Rollover row wherein columns are
shifted to the left, but that's already corrected in the PCIe r7.1 draft
as of 2026-04-07.)

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/aec4820a75e949b332585a08cb1808fda7f40ea4.1784905909.git.lukas@wunner.de

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