| Message ID | 162295949886.1109360.17423894188288323907.stgit@dwillia2-desk3.amr.corp.intel.com |
|---|---|
| State | New |
| Headers | show |
| Series | CXL port and decoder enumeration | expand |
On Sun, Jun 6, 2021 at 8:05 AM Dan Williams <dan.j.williams@intel.com> wrote: > > The recently released CXL specification change (ECN) for the CXL Fixed > Memory Window Structure (CFMWS) extension to the CXL Early Discovery > Table (CEDT) enables a large amount of functionality. It defines the > root of a CXL memory topology and is needed for all OS flows for CXL > provisioning CXL memory expanders. For ease of merging and tree > management add the new ACPI definition locally (drivers/cxl/acpi.h) in > such a way that they will not collide with the eventual arrival of the > definitions through the ACPICA project to their final location > (drivers/acpi/actbl1.h). I've just applied the ACPICA series including this change which can be made available as a forward-only branch in my tree, if that helps. > The definitions in drivers/cxl/acpi.h can be dropped post -rc1. > > Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> > Co-developed-by: Alison Schofield <alison.schofield@intel.com> > Co-developed-by: Erik Kaneda <erik.kaneda@intel.com> > Signed-off-by: Alison Schofield <alison.schofield@intel.com> > Signed-off-by: Erik Kaneda <erik.kaneda@intel.com> > Signed-off-by: Dan Williams <dan.j.williams@intel.com> > --- > drivers/cxl/acpi.h | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 48 insertions(+) > create mode 100644 drivers/cxl/acpi.h > > diff --git a/drivers/cxl/acpi.h b/drivers/cxl/acpi.h > new file mode 100644 > index 000000000000..1482c19e7227 > --- /dev/null > +++ b/drivers/cxl/acpi.h > @@ -0,0 +1,48 @@ > +/* SPDX-License-Identifier: GPL-2.0-only */ > +/* Copyright(c) 2021 Intel Corporation. */ > +#ifndef __CXL_ACPI_H__ > +#define __CXL_ACPI_H__ > + > +#ifndef ACPI_CEDT_CHBS_VERSION_CXL20 > +/* > + * NOTE: These definitions are temporary and to be deleted in v5.14-rc1 > + * when the identical definitions become available from > + * include/acpi/actbl1.h. > + */ > + > +#define ACPI_CEDT_TYPE_CFMWS 1 > +#define ACPI_CEDT_TYPE_RESERVED 2 > + > +#define ACPI_CEDT_CHBS_VERSION_CXL11 (0) > +#define ACPI_CEDT_CHBS_VERSION_CXL20 (1) > + > +#define ACPI_CEDT_CHBS_LENGTH_CXL11 (0x2000) > +#define ACPI_CEDT_CHBS_LENGTH_CXL20 (0x10000) > + > +struct acpi_cedt_cfmws { > + struct acpi_cedt_header header; > + u32 reserved1; > + u64 base_hpa; > + u64 window_size; > + u8 interleave_ways; > + u8 interleave_arithmetic; > + u16 reserved2; > + u32 granularity; > + u16 restrictions; > + u16 qtg_id; > + u32 interleave_targets[]; > +}; > + > +/* Values for Interleave Arithmetic field above */ > + > +#define ACPI_CEDT_CFMWS_ARITHMETIC_MODULO (0) > + > +/* Values for Restrictions field above */ > + > +#define ACPI_CEDT_CFMWS_RESTRICT_TYPE2 (1) > +#define ACPI_CEDT_CFMWS_RESTRICT_TYPE3 (1 << 1) > +#define ACPI_CEDT_CFMWS_RESTRICT_VOLATILE (1 << 2) > +#define ACPI_CEDT_CFMWS_RESTRICT_PMEM (1 << 3) > +#define ACPI_CEDT_CFMWS_RESTRICT_FIXED (1 << 4) > +#endif /* ACPI_CEDT_CHBS_VERSION_CXL20 */ > +#endif /* __CXL_ACPI_H__ */ >
On Mon, Jun 7, 2021 at 5:26 AM Rafael J. Wysocki <rafael@kernel.org> wrote: > > On Sun, Jun 6, 2021 at 8:05 AM Dan Williams <dan.j.williams@intel.com> wrote: > > > > The recently released CXL specification change (ECN) for the CXL Fixed > > Memory Window Structure (CFMWS) extension to the CXL Early Discovery > > Table (CEDT) enables a large amount of functionality. It defines the > > root of a CXL memory topology and is needed for all OS flows for CXL > > provisioning CXL memory expanders. For ease of merging and tree > > management add the new ACPI definition locally (drivers/cxl/acpi.h) in > > such a way that they will not collide with the eventual arrival of the > > definitions through the ACPICA project to their final location > > (drivers/acpi/actbl1.h). > > I've just applied the ACPICA series including this change which can be > made available as a forward-only branch in my tree, if that helps. Yes, please, that would be my preference. When I created this patch the concern was that a stable branch was possibly weeks away.
On Mon, Jun 7, 2021 at 10:03 AM Dan Williams <dan.j.williams@intel.com> wrote: > > On Mon, Jun 7, 2021 at 5:26 AM Rafael J. Wysocki <rafael@kernel.org> wrote: > > > > On Sun, Jun 6, 2021 at 8:05 AM Dan Williams <dan.j.williams@intel.com> wrote: > > > > > > The recently released CXL specification change (ECN) for the CXL Fixed > > > Memory Window Structure (CFMWS) extension to the CXL Early Discovery > > > Table (CEDT) enables a large amount of functionality. It defines the > > > root of a CXL memory topology and is needed for all OS flows for CXL > > > provisioning CXL memory expanders. For ease of merging and tree > > > management add the new ACPI definition locally (drivers/cxl/acpi.h) in > > > such a way that they will not collide with the eventual arrival of the > > > definitions through the ACPICA project to their final location > > > (drivers/acpi/actbl1.h). > > > > I've just applied the ACPICA series including this change which can be > > made available as a forward-only branch in my tree, if that helps. > > Yes, please, that would be my preference. When I created this patch > the concern was that a stable branch was possibly weeks away. Rafael, I see "4a2c1dcfaf59 ACPICA: Add the CFMWS structure definition to the CEDT table" in your tree, I can safely assume that commit will not rebase at this point? I'll likely rewind your acpica branch to that point and merge there to avoid carrying any unrelated follow-on commits.
On Tue, Jun 8, 2021 at 8:13 PM Dan Williams <dan.j.williams@intel.com> wrote: > > On Mon, Jun 7, 2021 at 10:03 AM Dan Williams <dan.j.williams@intel.com> wrote: > > > > On Mon, Jun 7, 2021 at 5:26 AM Rafael J. Wysocki <rafael@kernel.org> wrote: > > > > > > On Sun, Jun 6, 2021 at 8:05 AM Dan Williams <dan.j.williams@intel.com> wrote: > > > > > > > > The recently released CXL specification change (ECN) for the CXL Fixed > > > > Memory Window Structure (CFMWS) extension to the CXL Early Discovery > > > > Table (CEDT) enables a large amount of functionality. It defines the > > > > root of a CXL memory topology and is needed for all OS flows for CXL > > > > provisioning CXL memory expanders. For ease of merging and tree > > > > management add the new ACPI definition locally (drivers/cxl/acpi.h) in > > > > such a way that they will not collide with the eventual arrival of the > > > > definitions through the ACPICA project to their final location > > > > (drivers/acpi/actbl1.h). > > > > > > I've just applied the ACPICA series including this change which can be > > > made available as a forward-only branch in my tree, if that helps. > > > > Yes, please, that would be my preference. When I created this patch > > the concern was that a stable branch was possibly weeks away. > > Rafael, I see "4a2c1dcfaf59 ACPICA: Add the CFMWS structure definition > to the CEDT table" in your tree, I can safely assume that commit will > not rebase at this point? Yes, please. > I'll likely rewind your acpica branch to > that point and merge there to avoid carrying any unrelated follow-on > commits. Sure.
diff --git a/drivers/cxl/acpi.h b/drivers/cxl/acpi.h new file mode 100644 index 000000000000..1482c19e7227 --- /dev/null +++ b/drivers/cxl/acpi.h @@ -0,0 +1,48 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* Copyright(c) 2021 Intel Corporation. */ +#ifndef __CXL_ACPI_H__ +#define __CXL_ACPI_H__ + +#ifndef ACPI_CEDT_CHBS_VERSION_CXL20 +/* + * NOTE: These definitions are temporary and to be deleted in v5.14-rc1 + * when the identical definitions become available from + * include/acpi/actbl1.h. + */ + +#define ACPI_CEDT_TYPE_CFMWS 1 +#define ACPI_CEDT_TYPE_RESERVED 2 + +#define ACPI_CEDT_CHBS_VERSION_CXL11 (0) +#define ACPI_CEDT_CHBS_VERSION_CXL20 (1) + +#define ACPI_CEDT_CHBS_LENGTH_CXL11 (0x2000) +#define ACPI_CEDT_CHBS_LENGTH_CXL20 (0x10000) + +struct acpi_cedt_cfmws { + struct acpi_cedt_header header; + u32 reserved1; + u64 base_hpa; + u64 window_size; + u8 interleave_ways; + u8 interleave_arithmetic; + u16 reserved2; + u32 granularity; + u16 restrictions; + u16 qtg_id; + u32 interleave_targets[]; +}; + +/* Values for Interleave Arithmetic field above */ + +#define ACPI_CEDT_CFMWS_ARITHMETIC_MODULO (0) + +/* Values for Restrictions field above */ + +#define ACPI_CEDT_CFMWS_RESTRICT_TYPE2 (1) +#define ACPI_CEDT_CFMWS_RESTRICT_TYPE3 (1 << 1) +#define ACPI_CEDT_CFMWS_RESTRICT_VOLATILE (1 << 2) +#define ACPI_CEDT_CFMWS_RESTRICT_PMEM (1 << 3) +#define ACPI_CEDT_CFMWS_RESTRICT_FIXED (1 << 4) +#endif /* ACPI_CEDT_CHBS_VERSION_CXL20 */ +#endif /* __CXL_ACPI_H__ */