| Message ID | 1470984850-66891-9-git-send-email-guangrong.xiao@linux.intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Fri, 12 Aug 2016 14:54:10 +0800 Xiao Guangrong <guangrong.xiao@linux.intel.com> wrote: > Add the specification of Read FIT function should be squashed into 3/8 > > Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com> > --- > docs/specs/acpi_nvdimm.txt | 38 +++++++++++++++++++++++++++++++++++--- > 1 file changed, 35 insertions(+), 3 deletions(-) > > diff --git a/docs/specs/acpi_nvdimm.txt b/docs/specs/acpi_nvdimm.txt > index 0fdd251..1a31b19 100644 > --- a/docs/specs/acpi_nvdimm.txt > +++ b/docs/specs/acpi_nvdimm.txt > @@ -127,6 +127,38 @@ _DSM process diagram: > | result from the page | | | > +--------------------------+ +--------------+ > > - _FIT implementation > - ------------------- > - TODO (will fill it when nvdimm hotplug is introduced) > + QEMU internal use only _DSM function > + ------------------------------------ > + There is the function introduced by QEMU and only used by QEMU internal. > + > + 1) Read FIT > + As we only reserved one page for NVDIMM ACPI it is impossible to map the > + whole FIT data to guest's address space. This function is for NVDIMM root > + device and is used by _FIT method to read a piece of FIT data from QEMU. > + > + Input parameters: > + Arg0 – UUID {set to 2f10e7a4-9e91-11e4-89d3-123b93f75cba} > + Arg1 – Revision ID (set to 1) > + Arg2 - 0xFFFFFFFF > + Arg3 - A package containing a buffer whose layout is as follows: > + > + +----------+-------------+-------------+-----------------------------------+ > + | Filed | Byte Length | Byte Offset | Description | > + +----------+-------------+-------------+-----------------------------------+ > + | offset | 4 | 0 | the offset of FIT buffer | > + +----------+-------------+-------------+-----------------------------------+ > + > + Output: > + +----------+-------------+-------------+-----------------------------------+ > + | Filed | Byte Length | Byte Offset | Description | > + +----------+-------------+-------------+-----------------------------------+ > + | status | 4 | 0 | return status codes following | > + | | | | Chapter 3 in DSM Spec Rev1 | > + +----------+-------------+-------------+-----------------------------------+ > + | fit data | Varies | 8 | FIT data | > + | | | | | > + +----------+-------------+-------------+-----------------------------------+ > + > + The FIT offset is maintained by the caller itself, current offset plugs > + the length returned by the function is the next offset we should read. > + When all the FIT data has been read out, zero length is returned. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 09/30/2016 10:03 PM, Igor Mammedov wrote: > On Fri, 12 Aug 2016 14:54:10 +0800 > Xiao Guangrong <guangrong.xiao@linux.intel.com> wrote: > >> Add the specification of Read FIT function > should be squashed into 3/8 Okay. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/docs/specs/acpi_nvdimm.txt b/docs/specs/acpi_nvdimm.txt index 0fdd251..1a31b19 100644 --- a/docs/specs/acpi_nvdimm.txt +++ b/docs/specs/acpi_nvdimm.txt @@ -127,6 +127,38 @@ _DSM process diagram: | result from the page | | | +--------------------------+ +--------------+ - _FIT implementation - ------------------- - TODO (will fill it when nvdimm hotplug is introduced) + QEMU internal use only _DSM function + ------------------------------------ + There is the function introduced by QEMU and only used by QEMU internal. + + 1) Read FIT + As we only reserved one page for NVDIMM ACPI it is impossible to map the + whole FIT data to guest's address space. This function is for NVDIMM root + device and is used by _FIT method to read a piece of FIT data from QEMU. + + Input parameters: + Arg0 – UUID {set to 2f10e7a4-9e91-11e4-89d3-123b93f75cba} + Arg1 – Revision ID (set to 1) + Arg2 - 0xFFFFFFFF + Arg3 - A package containing a buffer whose layout is as follows: + + +----------+-------------+-------------+-----------------------------------+ + | Filed | Byte Length | Byte Offset | Description | + +----------+-------------+-------------+-----------------------------------+ + | offset | 4 | 0 | the offset of FIT buffer | + +----------+-------------+-------------+-----------------------------------+ + + Output: + +----------+-------------+-------------+-----------------------------------+ + | Filed | Byte Length | Byte Offset | Description | + +----------+-------------+-------------+-----------------------------------+ + | status | 4 | 0 | return status codes following | + | | | | Chapter 3 in DSM Spec Rev1 | + +----------+-------------+-------------+-----------------------------------+ + | fit data | Varies | 8 | FIT data | + | | | | | + +----------+-------------+-------------+-----------------------------------+ + + The FIT offset is maintained by the caller itself, current offset plugs + the length returned by the function is the next offset we should read. + When all the FIT data has been read out, zero length is returned.
Add the specification of Read FIT function Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com> --- docs/specs/acpi_nvdimm.txt | 38 +++++++++++++++++++++++++++++++++++--- 1 file changed, 35 insertions(+), 3 deletions(-)