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In preparation for adding dynamic DPA allocation, record the hw instance id in endpoint decoders, and enforce allocations to occur in hw instance id order. Signed-off-by: Dan Williams --- drivers/cxl/core/hdm.c | 14 ++++++++++++++ drivers/cxl/core/port.c | 1 + drivers/cxl/cxl.h | 2 ++ 3 files changed, 17 insertions(+) diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c index 3f929231b822..8805afe63ebf 100644 --- a/drivers/cxl/core/hdm.c +++ b/drivers/cxl/core/hdm.c @@ -153,6 +153,7 @@ static void __cxl_dpa_release(struct cxl_endpoint_decoder *cxled, bool remove_ac cxled->skip = 0; __release_region(&cxlds->dpa_res, res->start, resource_size(res)); cxled->dpa_res = NULL; + port->dpa_end--; } static void cxl_dpa_release(void *cxled) @@ -183,6 +184,18 @@ static int __cxl_dpa_reserve(struct cxl_endpoint_decoder *cxled, return -EBUSY; } + if (port->dpa_end + 1 != cxled->cxld.id) { + /* + * Assumes alloc and commit order is always in hardware instance + * order per expectations from 8.2.5.12.20 Committing Decoder + * Programming that enforce decoder[m] committed before + * decoder[m+1] commit start. + */ + dev_dbg(dev, "decoder%d.%d: expected decoder%d.%d\n", port->id, + cxled->cxld.id, port->id, port->dpa_end + 1); + return -EBUSY; + } + if (skip) { res = __request_region(&cxlds->dpa_res, base - skip, skip, dev_name(dev), 0); @@ -213,6 +226,7 @@ static int __cxl_dpa_reserve(struct cxl_endpoint_decoder *cxled, cxled->cxld.id, cxled->dpa_res); cxled->mode = CXL_DECODER_MIXED; } + port->dpa_end++; return 0; } diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c index 9d632c8c580b..54bf032cbcb7 100644 --- a/drivers/cxl/core/port.c +++ b/drivers/cxl/core/port.c @@ -485,6 +485,7 @@ static struct cxl_port *cxl_port_alloc(struct device *uport, port->uport = uport; port->component_reg_phys = component_reg_phys; ida_init(&port->decoder_ida); + port->dpa_end = -1; INIT_LIST_HEAD(&port->dports); INIT_LIST_HEAD(&port->endpoints); diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index aa223166f7ef..d8edbdaa6208 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -326,6 +326,7 @@ struct cxl_nvdimm { * @dports: cxl_dport instances referenced by decoders * @endpoints: cxl_ep instances, endpoints that are a descendant of this port * @decoder_ida: allocator for decoder ids + * @dpa_end: cursor to track highest allocated decoder for allocation ordering * @component_reg_phys: component register capability base address (optional) * @dead: last ep has been removed, force port re-creation * @depth: How deep this port is relative to the root. depth 0 is the root. @@ -337,6 +338,7 @@ struct cxl_port { struct list_head dports; struct list_head endpoints; struct ida decoder_ida; + int dpa_end; resource_size_t component_reg_phys; bool dead; unsigned int depth;