| Message ID | 20240729084611.502889-2-ying.huang@intel.com |
|---|---|
| State | New |
| Headers | show |
| Series | cxl: Preparation of type2 accelerators support | expand |
On Mon, Jul 29, 2024 at 04:46:09PM +0800, Ying Huang wrote: > Now, the target type of root decoder is hard-coded to HOSTONLYMEM, > because only type3 expanders are supported. To support type2 > accelerators, set the target type of root decoder based on the > window restrictions field of CFMWS entry. > Reviewed-by: Alison Schofield <alison.schofield@intel.com> > Signed-off-by: "Huang, Ying" <ying.huang@intel.com> > Suggested-by: Dan Williams <dan.j.williams@intel.com> > Cc: Davidlohr Bueso <dave@stgolabs.net> > Cc: Jonathan Cameron <jonathan.cameron@huawei.com> > Cc: Dave Jiang <dave.jiang@intel.com> > Cc: Alison Schofield <alison.schofield@intel.com> > Cc: Vishal Verma <vishal.l.verma@intel.com> > Cc: Ira Weiny <ira.weiny@intel.com> > Cc: Alejandro Lucero <alucerop@amd.com> > --- > drivers/cxl/acpi.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c > index 82b78e331d8e..40c92ad29122 100644 > --- a/drivers/cxl/acpi.c > +++ b/drivers/cxl/acpi.c > @@ -382,7 +382,10 @@ static int __cxl_parse_cfmws(struct acpi_cedt_cfmws *cfmws, > > cxld = &cxlrd->cxlsd.cxld; > cxld->flags = cfmws_to_decoder_flags(cfmws->restrictions); > - cxld->target_type = CXL_DECODER_HOSTONLYMEM; > + if (cxld->flags & CXL_DECODER_F_TYPE2) > + cxld->target_type = CXL_DECODER_DEVMEM; > + else > + cxld->target_type = CXL_DECODER_HOSTONLYMEM; > cxld->hpa_range = (struct range) { > .start = cfmws->base_hpa, > .end = cfmws->base_hpa + cfmws->window_size - 1, > -- > 2.39.2 >
On Mon, 29 Jul 2024 16:46:09 +0800 Huang Ying <ying.huang@intel.com> wrote: > Now, the target type of root decoder is hard-coded to HOSTONLYMEM, > because only type3 expanders are supported. To support type2 > accelerators, set the target type of root decoder based on the > window restrictions field of CFMWS entry. > > Signed-off-by: "Huang, Ying" <ying.huang@intel.com> > Suggested-by: Dan Williams <dan.j.williams@intel.com> > Cc: Davidlohr Bueso <dave@stgolabs.net> > Cc: Jonathan Cameron <jonathan.cameron@huawei.com> > Cc: Dave Jiang <dave.jiang@intel.com> > Cc: Alison Schofield <alison.schofield@intel.com> > Cc: Vishal Verma <vishal.l.verma@intel.com> > Cc: Ira Weiny <ira.weiny@intel.com> > Cc: Alejandro Lucero <alucerop@amd.com> > --- > drivers/cxl/acpi.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c > index 82b78e331d8e..40c92ad29122 100644 > --- a/drivers/cxl/acpi.c > +++ b/drivers/cxl/acpi.c > @@ -382,7 +382,10 @@ static int __cxl_parse_cfmws(struct acpi_cedt_cfmws *cfmws, > > cxld = &cxlrd->cxlsd.cxld; > cxld->flags = cfmws_to_decoder_flags(cfmws->restrictions); > - cxld->target_type = CXL_DECODER_HOSTONLYMEM; > + if (cxld->flags & CXL_DECODER_F_TYPE2) These flags need updating or we are going to run into problems long term. As of more recent specs, the distinction is messier than it was and it's device coherent HDM-D / HDM-DB (second one being type2 or type3 with BI support) and/or Host only coherent HDM-H. I'm curious on whether anyone is support both on same CFWMS? I believe it is possible and the spec doesn't rule it out. Jonathan > + cxld->target_type = CXL_DECODER_DEVMEM; > + else > + cxld->target_type = CXL_DECODER_HOSTONLYMEM; > cxld->hpa_range = (struct range) { > .start = cfmws->base_hpa, > .end = cfmws->base_hpa + cfmws->window_size - 1,
Hi, Jonathan, Jonathan Cameron <Jonathan.Cameron@Huawei.com> writes: > On Mon, 29 Jul 2024 16:46:09 +0800 > Huang Ying <ying.huang@intel.com> wrote: > >> Now, the target type of root decoder is hard-coded to HOSTONLYMEM, >> because only type3 expanders are supported. To support type2 >> accelerators, set the target type of root decoder based on the >> window restrictions field of CFMWS entry. >> >> Signed-off-by: "Huang, Ying" <ying.huang@intel.com> >> Suggested-by: Dan Williams <dan.j.williams@intel.com> >> Cc: Davidlohr Bueso <dave@stgolabs.net> >> Cc: Jonathan Cameron <jonathan.cameron@huawei.com> >> Cc: Dave Jiang <dave.jiang@intel.com> >> Cc: Alison Schofield <alison.schofield@intel.com> >> Cc: Vishal Verma <vishal.l.verma@intel.com> >> Cc: Ira Weiny <ira.weiny@intel.com> >> Cc: Alejandro Lucero <alucerop@amd.com> >> --- >> drivers/cxl/acpi.c | 5 ++++- >> 1 file changed, 4 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c >> index 82b78e331d8e..40c92ad29122 100644 >> --- a/drivers/cxl/acpi.c >> +++ b/drivers/cxl/acpi.c >> @@ -382,7 +382,10 @@ static int __cxl_parse_cfmws(struct acpi_cedt_cfmws *cfmws, >> >> cxld = &cxlrd->cxlsd.cxld; >> cxld->flags = cfmws_to_decoder_flags(cfmws->restrictions); >> - cxld->target_type = CXL_DECODER_HOSTONLYMEM; >> + if (cxld->flags & CXL_DECODER_F_TYPE2) > > These flags need updating or we are going to run into problems > long term. > > As of more recent specs, the distinction is messier than it was and > it's device coherent HDM-D / HDM-DB (second one being type2 or type3 with > BI support) and/or Host only coherent HDM-H. I got your idea. Previously, Device Coherent (HDM-D/DB) means type2 devices, while Host-only Coherent (HDM-H) means type3 devices. But in recent specs, type3 devices could be HDM-DB too. So, we should rename ACPI_CEDT_CFMWS_RESTRICT_TYPEX and CXL_DECODER_F_TYPEX. What's your suggestion for the new name? _DEVMEM and _HOSTONLYMEM? > I'm curious on whether anyone is support both on same CFWMS? > I believe it is possible and the spec doesn't rule it out. This sounds possible. > Jonathan > > >> + cxld->target_type = CXL_DECODER_DEVMEM; >> + else >> + cxld->target_type = CXL_DECODER_HOSTONLYMEM; >> cxld->hpa_range = (struct range) { >> .start = cfmws->base_hpa, >> .end = cfmws->base_hpa + cfmws->window_size - 1, -- Best Regards, Huang, Ying
On Mon, Jul 29, 2024 at 04:46:09PM +0800, Huang Ying wrote: > Now, the target type of root decoder is hard-coded to HOSTONLYMEM, > because only type3 expanders are supported. To support type2 > accelerators, set the target type of root decoder based on the > window restrictions field of CFMWS entry. > > Signed-off-by: "Huang, Ying" <ying.huang@intel.com> > Suggested-by: Dan Williams <dan.j.williams@intel.com> > Cc: Davidlohr Bueso <dave@stgolabs.net> > Cc: Jonathan Cameron <jonathan.cameron@huawei.com> > Cc: Dave Jiang <dave.jiang@intel.com> > Cc: Alison Schofield <alison.schofield@intel.com> > Cc: Vishal Verma <vishal.l.verma@intel.com> > Cc: Ira Weiny <ira.weiny@intel.com> > Cc: Alejandro Lucero <alucerop@amd.com> > --- Reviewed-by: Fan Ni <fan.ni@samsung.com> > drivers/cxl/acpi.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c > index 82b78e331d8e..40c92ad29122 100644 > --- a/drivers/cxl/acpi.c > +++ b/drivers/cxl/acpi.c > @@ -382,7 +382,10 @@ static int __cxl_parse_cfmws(struct acpi_cedt_cfmws *cfmws, > > cxld = &cxlrd->cxlsd.cxld; > cxld->flags = cfmws_to_decoder_flags(cfmws->restrictions); > - cxld->target_type = CXL_DECODER_HOSTONLYMEM; > + if (cxld->flags & CXL_DECODER_F_TYPE2) > + cxld->target_type = CXL_DECODER_DEVMEM; > + else > + cxld->target_type = CXL_DECODER_HOSTONLYMEM; > cxld->hpa_range = (struct range) { > .start = cfmws->base_hpa, > .end = cfmws->base_hpa + cfmws->window_size - 1, > -- > 2.39.2 >
diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c index 82b78e331d8e..40c92ad29122 100644 --- a/drivers/cxl/acpi.c +++ b/drivers/cxl/acpi.c @@ -382,7 +382,10 @@ static int __cxl_parse_cfmws(struct acpi_cedt_cfmws *cfmws, cxld = &cxlrd->cxlsd.cxld; cxld->flags = cfmws_to_decoder_flags(cfmws->restrictions); - cxld->target_type = CXL_DECODER_HOSTONLYMEM; + if (cxld->flags & CXL_DECODER_F_TYPE2) + cxld->target_type = CXL_DECODER_DEVMEM; + else + cxld->target_type = CXL_DECODER_HOSTONLYMEM; cxld->hpa_range = (struct range) { .start = cfmws->base_hpa, .end = cfmws->base_hpa + cfmws->window_size - 1,
Now, the target type of root decoder is hard-coded to HOSTONLYMEM, because only type3 expanders are supported. To support type2 accelerators, set the target type of root decoder based on the window restrictions field of CFMWS entry. Signed-off-by: "Huang, Ying" <ying.huang@intel.com> Suggested-by: Dan Williams <dan.j.williams@intel.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Jonathan Cameron <jonathan.cameron@huawei.com> Cc: Dave Jiang <dave.jiang@intel.com> Cc: Alison Schofield <alison.schofield@intel.com> Cc: Vishal Verma <vishal.l.verma@intel.com> Cc: Ira Weiny <ira.weiny@intel.com> Cc: Alejandro Lucero <alucerop@amd.com> --- drivers/cxl/acpi.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)