On Sun, 23 Jan 2022 16:29:47 -0800 Dan Williams <dan.j.williams@xxxxxxxxx> wrote: > From: Ben Widawsky <ben.widawsky@xxxxxxxxx> > > Unused CXL decoders, or ports which use a passthrough decoder (no HDM > decoder registers) are expected to be initialized in a specific way. > Since upcoming drivers will want the same initialization, and it was > already a requirement to have consumers of the API configure the decoder > specific to their needs, initialize to this passthrough state by > default. > > Signed-off-by: Ben Widawsky <ben.widawsky@xxxxxxxxx> > Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx> Make sense to me. Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> > --- > drivers/cxl/acpi.c | 5 ----- > drivers/cxl/core/port.c | 9 ++++++++- > 2 files changed, 8 insertions(+), 6 deletions(-) > > diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c > index 0b267eabb15e..4e8086525edc 100644 > --- a/drivers/cxl/acpi.c > +++ b/drivers/cxl/acpi.c > @@ -264,11 +264,6 @@ static int add_host_bridge_uport(struct device *match, void *arg) > if (IS_ERR(cxld)) > return PTR_ERR(cxld); > > - cxld->interleave_ways = 1; > - cxld->interleave_granularity = PAGE_SIZE; > - cxld->target_type = CXL_DECODER_EXPANDER; > - cxld->platform_res = (struct resource)DEFINE_RES_MEM(0, 0); > - > device_lock(&port->dev); > dport = list_first_entry(&port->dports, typeof(*dport), list); > device_unlock(&port->dev); > diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c > index 2910c36a0e58..826b300ba950 100644 > --- a/drivers/cxl/core/port.c > +++ b/drivers/cxl/core/port.c > @@ -505,7 +505,8 @@ static int decoder_populate_targets(struct cxl_decoder *cxld, > * some address space for CXL.mem utilization. A decoder is expected to be > * configured by the caller before registering. > * > - * Return: A new cxl decoder to be registered by cxl_decoder_add() > + * Return: A new cxl decoder to be registered by cxl_decoder_add(). The decoder > + * is initialized to be a "passthrough" decoder. > */ > static struct cxl_decoder *cxl_decoder_alloc(struct cxl_port *port, > unsigned int nr_targets) > @@ -537,6 +538,12 @@ static struct cxl_decoder *cxl_decoder_alloc(struct cxl_port *port, > else > cxld->dev.type = &cxl_decoder_switch_type; > > + /* Pre initialize an "empty" decoder */ > + cxld->interleave_ways = 1; > + cxld->interleave_granularity = PAGE_SIZE; > + cxld->target_type = CXL_DECODER_EXPANDER; > + cxld->platform_res = (struct resource)DEFINE_RES_MEM(0, 0); > + > return cxld; > err: > kfree(cxld); >
