cxl/edac: Fix wrong dpa checking for PPR operation

Per Table 8-143. "Get Partition Info Output Payload" in CXL r3.2 section
8.2.10.9.2.1 "Get Partition Info(Opcode 4100h)", DPA 0 is a valid
address of a CXL device. However, cxl_do_ppr() considers it as an
invalid address, so that user will get an -EINVAL when user calls the
sysfs interface of the edac driver to trigger a Post Package Repair(PPR)
operation for DPA 0 on a CXL device. The correct implementation should
be checking if the input DPA is in the DPA range of the CXL device.

Fixes: be9b359 ("cxl/edac: Add CXL memory device soft PPR control feature")
Signed-off-by: Li Ming <[email protected]>
Tested-by: Shiju Jose <[email protected]>
Reviewed-by: Shiju Jose <[email protected]>
Reviewed-by: Dave Jiang <[email protected]>
Reviewed-by: Alison Schofield <[email protected]>
Reviewed-by: Jonathan Cameron <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Dave Jiang <[email protected]>

Author: MingLi-4

drivers/cxl/core/edac.c

@@ -1923,8 +1923,11 @@ static int cxl_ppr_set_nibble_mask(struct device *dev, void *drv_data,
 static int cxl_do_ppr(struct device *dev, void *drv_data, u32 val)
 {
 	struct cxl_ppr_context *cxl_ppr_ctx = drv_data;
+	struct cxl_memdev *cxlmd = cxl_ppr_ctx->cxlmd;
+	struct cxl_dev_state *cxlds = cxlmd->cxlds;
 
-	if (!cxl_ppr_ctx->dpa || val != EDAC_DO_MEM_REPAIR)
+	if (val != EDAC_DO_MEM_REPAIR ||
+	    !cxl_resource_contains_addr(&cxlds->dpa_res, cxl_ppr_ctx->dpa))
 		return -EINVAL;
 
 	return cxl_mem_perform_ppr(cxl_ppr_ctx);