cxl: update names for interleave granularity conversion macros

Change names for granularity macros to clearly indicate which
variable is encoded and which is the actual granularity.

granularity == interleave granularity
eig == encoded interleave granularity
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/167027493237.3124429.8948852388671827664.stgit@djiang5-desk3.ch.intel.comSigned-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/cxl/acpi.c

@@ -86,7 +86,7 @@ static int cxl_parse_cxims(union acpi_subtable_headers *header, void *arg,
 	unsigned int hbig, nr_maps;
 	int rc;
 
-	rc = cxl_to_granularity(cxims->hbig, &hbig);
+	rc = eig_to_granularity(cxims->hbig, &hbig);
 	if (rc)
 		return rc;
 
@@ -224,7 +224,7 @@ static int cxl_parse_cfmws(union acpi_subtable_headers *header, void *arg,
 	rc = cxl_to_ways(cfmws->interleave_ways, &ways);
 	if (rc)
 		return rc;
-	rc = cxl_to_granularity(cfmws->granularity, &ig);
+	rc = eig_to_granularity(cfmws->granularity, &ig);
 	if (rc)
 		return rc;
 	for (i = 0; i < ways; i++)

drivers/cxl/core/hdm.c

@@ -497,7 +497,7 @@ static void cxld_set_interleave(struct cxl_decoder *cxld, u32 *ctrl)
 	if (WARN_ONCE(ways_to_cxl(cxld->interleave_ways, &eiw),
 		      "invalid interleave_ways: %d\n", cxld->interleave_ways))
 		return;
-	if (WARN_ONCE(granularity_to_cxl(cxld->interleave_granularity, &eig),
+	if (WARN_ONCE(granularity_to_eig(cxld->interleave_granularity, &eig),
 		      "invalid interleave_granularity: %d\n",
 		      cxld->interleave_granularity))
 		return;
@@ -749,8 +749,8 @@ static int init_hdm_decoder(struct cxl_port *port, struct cxl_decoder *cxld,
 			 port->id, cxld->id, ctrl);
 		return rc;
 	}
-	rc = cxl_to_granularity(FIELD_GET(CXL_HDM_DECODER0_CTRL_IG_MASK, ctrl),
-				&cxld->interleave_granularity);
+	rc = eig_to_granularity(FIELD_GET(CXL_HDM_DECODER0_CTRL_IG_MASK, ctrl),
+				 &cxld->interleave_granularity);
 	if (rc)
 		return rc;
 

drivers/cxl/core/region.c

@@ -391,7 +391,7 @@ static ssize_t interleave_granularity_store(struct device *dev,
 	if (rc)
 		return rc;
 
-	rc = granularity_to_cxl(val, &ig);
+	rc = granularity_to_eig(val, &ig);
 	if (rc)
 		return rc;
 
@@ -1028,7 +1028,7 @@ static int cxl_port_setup_targets(struct cxl_port *port,
 		parent_iw = parent_cxld->interleave_ways;
 	}
 
-	rc = granularity_to_cxl(parent_ig, &peig);
+	rc = granularity_to_eig(parent_ig, &peig);
 	if (rc) {
 		dev_dbg(&cxlr->dev, "%s:%s: invalid parent granularity: %d\n",
 			dev_name(parent_port->uport),
@@ -1065,7 +1065,7 @@ static int cxl_port_setup_targets(struct cxl_port *port,
 		eig = peig;
 	}
 
-	rc = cxl_to_granularity(eig, &ig);
+	rc = eig_to_granularity(eig, &ig);
 	if (rc) {
 		dev_dbg(&cxlr->dev, "%s:%s: invalid interleave: %d\n",
 			dev_name(port->uport), dev_name(&port->dev),

drivers/cxl/cxl.h

@@ -74,11 +74,11 @@ static inline int cxl_hdm_decoder_count(u32 cap_hdr)
 }
 
 /* Encode defined in CXL 2.0 8.2.5.12.7 HDM Decoder Control Register */
-static inline int cxl_to_granularity(u16 ig, unsigned int *val)
+static inline int eig_to_granularity(u16 eig, unsigned int *granularity)
 {
-	if (ig > CXL_DECODER_MAX_ENCODED_IG)
+	if (eig > CXL_DECODER_MAX_ENCODED_IG)
 		return -EINVAL;
-	*val = CXL_DECODER_MIN_GRANULARITY << ig;
+	*granularity = CXL_DECODER_MIN_GRANULARITY << eig;
 	return 0;
 }
 
@@ -99,11 +99,12 @@ static inline int cxl_to_ways(u8 eniw, unsigned int *val)
 	return 0;
 }
 
-static inline int granularity_to_cxl(int g, u16 *ig)
+static inline int granularity_to_eig(int granularity, u16 *eig)
 {
-	if (g > SZ_16K || g < CXL_DECODER_MIN_GRANULARITY || !is_power_of_2(g))
+	if (granularity > SZ_16K || granularity < CXL_DECODER_MIN_GRANULARITY ||
+	    !is_power_of_2(granularity))
 		return -EINVAL;
-	*ig = ilog2(g) - 8;
+	*eig = ilog2(granularity) - 8;
 	return 0;
 }