From: Zhao Yakui <[email protected]>
Hi,
ACPI 4.0 spec adds the ACPI IPMI opregion, which means that the ACPI AML
code can also communicate with the BMC controller. This patch set is to
install the ACPI IPMI opregion space handler and enable the ACPI to access
the BMC controller through the IPMI message.
[RFC Patch 01/02]: Add one interface to get more info of low-level interface
It will return the corresponding info of low-level interface based
on the expected type(For example: SI_ACPI, SI_PCI and so on.)
[RFC Patch 02/02]: Install the IPMI space handler to enable ACPI to access the
BMC
controller
V8-V9: This patch set is based on the mechanism that add one interface that can
get more info of low-level IPMI device. For example: the ACPI device handle will
be returned for the pnp_acpi. Then the second patch will use the added interface
to check whether the IPMI device is what ACPI wanted to communicated with in the
new_smi callback function of smi_watcher. If it is, we will install the IPMI
opregion handler and enable ACPI to communicate with BMC.
V7->V8: Based on Bjorn's comment, use acpi ipmi notifier hook function to
avoid the discovery of ACPI pnp IPMI device again. Then in course of binding
/unbinding ipmi pnp driver with the corresponding device, the notifier chain
function will be called to install/uninstall the ACPI IPMI opregion space
handler.
V6->V7: Based on Corey Minyard's comments, the IPMI opregion handler is put
into the separate file again as it only uses the API interface provided
by IPMI system. Now it is put into the ACPI subsystem.
V5->V6: Adjust the patch order and refresh the patch set.
V4->V5: According to Bjorn's comment, remove the unnecessary comment.
The debug info will be printed by using dev_err/dev_warn instead of by
using printk directly.
V3->V4: According to Bjorn's comment, delete the meaningless variable
initialization and check. We also do some cleanup.
V2->V3: According to Bjorn's comment, this IPMI opregion code is put into
the IPMI subsystem(ipmi_si_intf.c). In such case the part of IPMI opregion
code will be installed automatically when IPMI detection module is loaded.
When the IPMI system interface is detected by loading PNP device driver, we
will record every IPMI system interface defined in ACPI namespace and then
install the corresponding IPMI opregion space handler, which is used to enable
ACPI AML code to access the BMC controller.
V1->V2: According to Bjorn's comment, we won't install the IPMI space handler
by loading an ACPI device driver. Instead we will enumerate the ACPI IPMI
device directly in ACPI device tree and then install the IPMI space handler.
Then ACPI AML code and access the BMC controller through the IPMI space
handler.
Best regards.
Yakui
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