cxl/region: Move cxl_trace_hpa() work to the region driver

This work belongs in the region driver as it is only useful with
CONFIG_CXL_REGION. Add a stub in core.h for when the region driver
is not built.

Signed-off-by: Alison Schofield <[email protected]>
Reviewed-by: Jonathan Cameron <[email protected]>
Reviewed-by: Ira Weiny <[email protected]>
Link: https://lore.kernel.org/r/183222631f11a43c5e6debc42ec22fe1bd4b818a.1714496730.git.alison.schofield@intel.com
Signed-off-by: Dave Jiang <[email protected]>

Author: AlisonSchofield

drivers/cxl/core/core.h

@@ -28,8 +28,15 @@ int cxl_region_init(void);
 void cxl_region_exit(void);
 int cxl_get_poison_by_endpoint(struct cxl_port *port);
 struct cxl_region *cxl_dpa_to_region(const struct cxl_memdev *cxlmd, u64 dpa);
+u64 cxl_trace_hpa(struct cxl_region *cxlr, const struct cxl_memdev *cxlmd,
+		  u64 dpa);
 
 #else
+static inline u64
+cxl_trace_hpa(struct cxl_region *cxlr, const struct cxl_memdev *cxlmd, u64 dpa)
+{
+	return ULLONG_MAX;
+}
 static inline
 struct cxl_region *cxl_dpa_to_region(const struct cxl_memdev *cxlmd, u64 dpa)
 {

drivers/cxl/core/region.c

@@ -2723,6 +2723,97 @@ struct cxl_region *cxl_dpa_to_region(const struct cxl_memdev *cxlmd, u64 dpa)
 	return ctx.cxlr;
 }
 
+static bool cxl_is_hpa_in_range(u64 hpa, struct cxl_region *cxlr, int pos)
+{
+	struct cxl_region_params *p = &cxlr->params;
+	int gran = p->interleave_granularity;
+	int ways = p->interleave_ways;
+	u64 offset;
+
+	/* Is the hpa within this region at all */
+	if (hpa < p->res->start || hpa > p->res->end) {
+		dev_dbg(&cxlr->dev,
+			"Addr trans fail: hpa 0x%llx not in region\n", hpa);
+		return false;
+	}
+
+	/* Is the hpa in an expected chunk for its pos(-ition) */
+	offset = hpa - p->res->start;
+	offset = do_div(offset, gran * ways);
+	if ((offset >= pos * gran) && (offset < (pos + 1) * gran))
+		return true;
+
+	dev_dbg(&cxlr->dev,
+		"Addr trans fail: hpa 0x%llx not in expected chunk\n", hpa);
+
+	return false;
+}
+
+static u64 cxl_dpa_to_hpa(u64 dpa,  struct cxl_region *cxlr,
+			  struct cxl_endpoint_decoder *cxled)
+{
+	u64 dpa_offset, hpa_offset, bits_upper, mask_upper, hpa;
+	struct cxl_region_params *p = &cxlr->params;
+	int pos = cxled->pos;
+	u16 eig = 0;
+	u8 eiw = 0;
+
+	ways_to_eiw(p->interleave_ways, &eiw);
+	granularity_to_eig(p->interleave_granularity, &eig);
+
+	/*
+	 * The device position in the region interleave set was removed
+	 * from the offset at HPA->DPA translation. To reconstruct the
+	 * HPA, place the 'pos' in the offset.
+	 *
+	 * The placement of 'pos' in the HPA is determined by interleave
+	 * ways and granularity and is defined in the CXL Spec 3.0 Section
+	 * 8.2.4.19.13 Implementation Note: Device Decode Logic
+	 */
+
+	/* Remove the dpa base */
+	dpa_offset = dpa - cxl_dpa_resource_start(cxled);
+
+	mask_upper = GENMASK_ULL(51, eig + 8);
+
+	if (eiw < 8) {
+		hpa_offset = (dpa_offset & mask_upper) << eiw;
+		hpa_offset |= pos << (eig + 8);
+	} else {
+		bits_upper = (dpa_offset & mask_upper) >> (eig + 8);
+		bits_upper = bits_upper * 3;
+		hpa_offset = ((bits_upper << (eiw - 8)) + pos) << (eig + 8);
+	}
+
+	/* The lower bits remain unchanged */
+	hpa_offset |= dpa_offset & GENMASK_ULL(eig + 7, 0);
+
+	/* Apply the hpa_offset to the region base address */
+	hpa = hpa_offset + p->res->start;
+
+	if (!cxl_is_hpa_in_range(hpa, cxlr, cxled->pos))
+		return ULLONG_MAX;
+
+	return hpa;
+}
+
+u64 cxl_trace_hpa(struct cxl_region *cxlr, const struct cxl_memdev *cxlmd,
+		  u64 dpa)
+{
+	struct cxl_region_params *p = &cxlr->params;
+	struct cxl_endpoint_decoder *cxled = NULL;
+
+	for (int i = 0; i <  p->nr_targets; i++) {
+		cxled = p->targets[i];
+		if (cxlmd == cxled_to_memdev(cxled))
+			break;
+	}
+	if (!cxled || cxlmd != cxled_to_memdev(cxled))
+		return ULLONG_MAX;
+
+	return cxl_dpa_to_hpa(dpa, cxlr, cxled);
+}
+
 static struct lock_class_key cxl_pmem_region_key;
 
 static struct cxl_pmem_region *cxl_pmem_region_alloc(struct cxl_region *cxlr)

drivers/cxl/core/trace.c

@@ -6,94 +6,3 @@
 
 #define CREATE_TRACE_POINTS
 #include "trace.h"
-
-static bool cxl_is_hpa_in_range(u64 hpa, struct cxl_region *cxlr, int pos)
-{
-	struct cxl_region_params *p = &cxlr->params;
-	int gran = p->interleave_granularity;
-	int ways = p->interleave_ways;
-	u64 offset;
-
-	/* Is the hpa within this region at all */
-	if (hpa < p->res->start || hpa > p->res->end) {
-		dev_dbg(&cxlr->dev,
-			"Addr trans fail: hpa 0x%llx not in region\n", hpa);
-		return false;
-	}
-
-	/* Is the hpa in an expected chunk for its pos(-ition) */
-	offset = hpa - p->res->start;
-	offset = do_div(offset, gran * ways);
-	if ((offset >= pos * gran) && (offset < (pos + 1) * gran))
-		return true;
-
-	dev_dbg(&cxlr->dev,
-		"Addr trans fail: hpa 0x%llx not in expected chunk\n", hpa);
-
-	return false;
-}
-
-static u64 cxl_dpa_to_hpa(u64 dpa,  struct cxl_region *cxlr,
-			  struct cxl_endpoint_decoder *cxled)
-{
-	u64 dpa_offset, hpa_offset, bits_upper, mask_upper, hpa;
-	struct cxl_region_params *p = &cxlr->params;
-	int pos = cxled->pos;
-	u16 eig = 0;
-	u8 eiw = 0;
-
-	ways_to_eiw(p->interleave_ways, &eiw);
-	granularity_to_eig(p->interleave_granularity, &eig);
-
-	/*
-	 * The device position in the region interleave set was removed
-	 * from the offset at HPA->DPA translation. To reconstruct the
-	 * HPA, place the 'pos' in the offset.
-	 *
-	 * The placement of 'pos' in the HPA is determined by interleave
-	 * ways and granularity and is defined in the CXL Spec 3.0 Section
-	 * 8.2.4.19.13 Implementation Note: Device Decode Logic
-	 */
-
-	/* Remove the dpa base */
-	dpa_offset = dpa - cxl_dpa_resource_start(cxled);
-
-	mask_upper = GENMASK_ULL(51, eig + 8);
-
-	if (eiw < 8) {
-		hpa_offset = (dpa_offset & mask_upper) << eiw;
-		hpa_offset |= pos << (eig + 8);
-	} else {
-		bits_upper = (dpa_offset & mask_upper) >> (eig + 8);
-		bits_upper = bits_upper * 3;
-		hpa_offset = ((bits_upper << (eiw - 8)) + pos) << (eig + 8);
-	}
-
-	/* The lower bits remain unchanged */
-	hpa_offset |= dpa_offset & GENMASK_ULL(eig + 7, 0);
-
-	/* Apply the hpa_offset to the region base address */
-	hpa = hpa_offset + p->res->start;
-
-	if (!cxl_is_hpa_in_range(hpa, cxlr, cxled->pos))
-		return ULLONG_MAX;
-
-	return hpa;
-}
-
-u64 cxl_trace_hpa(struct cxl_region *cxlr, struct cxl_memdev *cxlmd,
-		  u64 dpa)
-{
-	struct cxl_region_params *p = &cxlr->params;
-	struct cxl_endpoint_decoder *cxled = NULL;
-
-	for (int i = 0; i <  p->nr_targets; i++) {
-		cxled = p->targets[i];
-		if (cxlmd == cxled_to_memdev(cxled))
-			break;
-	}
-	if (!cxled || cxlmd != cxled_to_memdev(cxled))
-		return ULLONG_MAX;
-
-	return cxl_dpa_to_hpa(dpa, cxlr, cxled);
-}

drivers/cxl/core/trace.h

@@ -642,8 +642,6 @@ TRACE_EVENT(cxl_memory_module,
 #define cxl_poison_overflow(flags, time)				\
 	(flags & CXL_POISON_FLAG_OVERFLOW ? le64_to_cpu(time) : 0)
 
-u64 cxl_trace_hpa(struct cxl_region *cxlr, struct cxl_memdev *memdev, u64 dpa);
-
 TRACE_EVENT(cxl_poison,
 
 	TP_PROTO(struct cxl_memdev *cxlmd, struct cxl_region *cxlr,