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This is a > > x2 interleave underneath a x1 CXL Window. > > > > $ modprobe cxl_test > > $ # cxl list -Ru > > { > > "region":"region3", > > "resource":"0xf010000000", > > "size":"512.00 MiB (536.87 MB)", > > "interleave_ways":2, > > "interleave_granularity":4096, > > "decode_state":"commit" > > } > > > > Signed-off-by: Dan Williams > > --- > > drivers/cxl/core/core.h | 3 - > > drivers/cxl/core/hdm.c | 3 + > > drivers/cxl/core/port.c | 4 + > > drivers/cxl/cxl.h | 4 + > > drivers/cxl/cxlmem.h | 3 + > > tools/testing/cxl/test/cxl.c | 146 +++++++++++++++++++++++++++++++++++++++--- > > 6 files changed, 148 insertions(+), 15 deletions(-) > > > > > diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c > > index 8130430ffbcf..8d0895cbae93 100644 > > --- a/drivers/cxl/core/port.c > > +++ b/drivers/cxl/core/port.c > > @@ -458,6 +458,7 @@ bool is_switch_decoder(struct device *dev) > > { > > return is_root_decoder(dev) || dev->type == &cxl_decoder_switch_type; > > } > > +EXPORT_SYMBOL_NS_GPL(is_switch_decoder, CXL); > > > > struct cxl_decoder *to_cxl_decoder(struct device *dev) > > { > > @@ -485,6 +486,7 @@ struct cxl_switch_decoder *to_cxl_switch_decoder(struct device *dev) > > return NULL; > > return container_of(dev, struct cxl_switch_decoder, cxld.dev); > > } > > +EXPORT_SYMBOL_NS_GPL(to_cxl_switch_decoder, CXL); > > > > static void cxl_ep_release(struct cxl_ep *ep) > > { > > @@ -528,7 +530,7 @@ static const struct device_type cxl_port_type = { > > > > bool is_cxl_port(struct device *dev) > > { > > - return dev->type == &cxl_port_type; > > + return dev && dev->type == &cxl_port_type; > > Adding that protection just for mocking seems a bit nasty. > Could you push the sanity check out to the caller or am I missing something? > Perhaps worth calling out the reason we'd call this on a NULL dev with a comment > or similar. Oh, that was probably a bug fix for an interim version of cxl_test that I neglected to come back and clean up. A "while (port)" loop should not walk off the top of a port->dev.parent chain. Confirmed that the self-test still passes with this extra check gone. > > } > > EXPORT_SYMBOL_NS_GPL(is_cxl_port, CXL); > > > > diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h > > index 9b3765c5c81a..4c6ee6c96f23 100644 > > --- a/drivers/cxl/cxl.h > > +++ b/drivers/cxl/cxl.h > > @@ -452,6 +452,7 @@ struct cxl_region_params { > > * struct cxl_region - CXL region > > * @dev: This region's device > > * @id: This region's id. Id is globally unique across all regions > > + * @fixed: At least one decoder in this region was locked down at init > > * @mode: Endpoint decoder allocation / access mode > > * @type: Endpoint decoder target type > > * @cxl_nvb: nvdimm bridge for coordinating @cxlr_pmem setup / shutdown > > @@ -462,6 +463,7 @@ struct cxl_region_params { > > struct cxl_region { > > struct device dev; > > int id; > > + bool fixed; > > I was wondering why a mocking patch was changing the region state structure... > It isn't - this isn't used that I can find. Another interim hack that I failed to cleanup before posting.