| Message ID | 20241209185429.54054-27-alejandro.lucero-palau@amd.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | cxl: add type2 device basic support | expand |
On Mon, 9 Dec 2024 18:54:27 +0000 <alejandro.lucero-palau@amd.com> wrote: > From: Alejandro Lucero <alucerop@amd.com> > Reviewed-by: Zhi Wang <zhiw@nvidia.com> > A CXL region struct contains the physical address to work with. > > Add a function for getting the cxl region range to be used for mapping > such memory range. > > Signed-off-by: Alejandro Lucero <alucerop@amd.com> > --- > drivers/cxl/core/region.c | 15 +++++++++++++++ > drivers/cxl/cxl.h | 1 + > include/cxl/cxl.h | 1 + > 3 files changed, 17 insertions(+) > > diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c > index b39086356d74..910037546a06 100644 > --- a/drivers/cxl/core/region.c > +++ b/drivers/cxl/core/region.c > @@ -2676,6 +2676,21 @@ static struct cxl_region *devm_cxl_add_region(struct cxl_root_decoder *cxlrd, > return ERR_PTR(rc); > } > > +int cxl_get_region_range(struct cxl_region *region, struct range *range) > +{ > + if (WARN_ON_ONCE(!region)) > + return -ENODEV; > + > + if (!region->params.res) > + return -ENOSPC; > + > + range->start = region->params.res->start; > + range->end = region->params.res->end; > + > + return 0; > +} > +EXPORT_SYMBOL_NS_GPL(cxl_get_region_range, "CXL"); > + > static ssize_t __create_region_show(struct cxl_root_decoder *cxlrd, char *buf) > { > return sysfs_emit(buf, "region%u\n", atomic_read(&cxlrd->region_id)); > diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h > index cc9e3d859fa6..32d2bd0520d4 100644 > --- a/drivers/cxl/cxl.h > +++ b/drivers/cxl/cxl.h > @@ -920,6 +920,7 @@ void cxl_coordinates_combine(struct access_coordinate *out, > > bool cxl_endpoint_decoder_reset_detected(struct cxl_port *port); > > +int cxl_get_region_range(struct cxl_region *region, struct range *range); > /* > * Unit test builds overrides this to __weak, find the 'strong' version > * of these symbols in tools/testing/cxl/. > diff --git a/include/cxl/cxl.h b/include/cxl/cxl.h > index 14be26358f9c..0ed9e32f25dd 100644 > --- a/include/cxl/cxl.h > +++ b/include/cxl/cxl.h > @@ -65,4 +65,5 @@ struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd, > bool no_dax); > > int cxl_accel_region_detach(struct cxl_endpoint_decoder *cxled); > +int cxl_get_region_range(struct cxl_region *region, struct range *range); > #endif
diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index b39086356d74..910037546a06 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -2676,6 +2676,21 @@ static struct cxl_region *devm_cxl_add_region(struct cxl_root_decoder *cxlrd, return ERR_PTR(rc); } +int cxl_get_region_range(struct cxl_region *region, struct range *range) +{ + if (WARN_ON_ONCE(!region)) + return -ENODEV; + + if (!region->params.res) + return -ENOSPC; + + range->start = region->params.res->start; + range->end = region->params.res->end; + + return 0; +} +EXPORT_SYMBOL_NS_GPL(cxl_get_region_range, "CXL"); + static ssize_t __create_region_show(struct cxl_root_decoder *cxlrd, char *buf) { return sysfs_emit(buf, "region%u\n", atomic_read(&cxlrd->region_id)); diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index cc9e3d859fa6..32d2bd0520d4 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -920,6 +920,7 @@ void cxl_coordinates_combine(struct access_coordinate *out, bool cxl_endpoint_decoder_reset_detected(struct cxl_port *port); +int cxl_get_region_range(struct cxl_region *region, struct range *range); /* * Unit test builds overrides this to __weak, find the 'strong' version * of these symbols in tools/testing/cxl/. diff --git a/include/cxl/cxl.h b/include/cxl/cxl.h index 14be26358f9c..0ed9e32f25dd 100644 --- a/include/cxl/cxl.h +++ b/include/cxl/cxl.h @@ -65,4 +65,5 @@ struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd, bool no_dax); int cxl_accel_region_detach(struct cxl_endpoint_decoder *cxled); +int cxl_get_region_range(struct cxl_region *region, struct range *range); #endif