net: ipa: introduce ipa_mem_id_optional()

Introduce a new function that indicates whether a given memory
region is required for a given version of IPA hardware.  Use it to
verify that all required regions are present during initialization.

Reorder the definitions of the memory region IDs to be based on
the version in which they're first defined.  Use "+" rather than
"and above" where defining the IPA versions in which memory IDs are
used, and indicate which regions are optional (many are not).
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ipa/ipa_mem.c

@@ -99,6 +99,36 @@ int ipa_mem_setup(struct ipa *ipa)
 	return 0;
 }
 
+/* Must the given memory region be present in the configuration? */
+static bool ipa_mem_id_required(struct ipa *ipa, enum ipa_mem_id mem_id)
+{
+	switch (mem_id) {
+	case IPA_MEM_UC_SHARED:
+	case IPA_MEM_UC_INFO:
+	case IPA_MEM_V4_FILTER_HASHED:
+	case IPA_MEM_V4_FILTER:
+	case IPA_MEM_V6_FILTER_HASHED:
+	case IPA_MEM_V6_FILTER:
+	case IPA_MEM_V4_ROUTE_HASHED:
+	case IPA_MEM_V4_ROUTE:
+	case IPA_MEM_V6_ROUTE_HASHED:
+	case IPA_MEM_V6_ROUTE:
+	case IPA_MEM_MODEM_HEADER:
+	case IPA_MEM_MODEM_PROC_CTX:
+	case IPA_MEM_AP_PROC_CTX:
+	case IPA_MEM_MODEM:
+		return true;
+
+	case IPA_MEM_PDN_CONFIG:
+	case IPA_MEM_STATS_QUOTA_MODEM:
+	case IPA_MEM_STATS_TETHERING:
+		return ipa->version >= IPA_VERSION_4_0;
+
+	default:
+		return false;		/* Anything else is optional */
+	}
+}
+
 static bool ipa_mem_valid_one(struct ipa *ipa, const struct ipa_mem *mem)
 {
 	struct device *dev = &ipa->pdev->dev;
@@ -149,8 +179,20 @@ static bool ipa_mem_valid(struct ipa *ipa, const struct ipa_mem_data *mem_data)
 		if (mem->offset)
 			dev_warn(dev, "empty region %u has non-zero offset\n",
 				 mem_id);
+
+		if (ipa_mem_id_required(ipa, mem_id)) {
+			dev_err(dev, "required memory region %u missing\n",
+				mem_id);
+			return false;
+		}
 	}
 
+	/* Now see if any required regions are not defined */
+	while (mem_id < IPA_MEM_COUNT)
+		if (ipa_mem_id_required(ipa, mem_id++))
+			dev_err(dev, "required memory region %u missing\n",
+				mem_id);
+
 	return true;
 }
 

drivers/net/ipa/ipa_mem.h

@@ -55,22 +55,23 @@ enum ipa_mem_id {
 	IPA_MEM_V6_ROUTE_HASHED,	/* 2 canaries */
 	IPA_MEM_V6_ROUTE,		/* 2 canaries */
 	IPA_MEM_MODEM_HEADER,		/* 2 canaries */
-	IPA_MEM_AP_HEADER,		/* 0 canaries */
+	IPA_MEM_AP_HEADER,		/* 0 canaries, optional */
 	IPA_MEM_MODEM_PROC_CTX,		/* 2 canaries */
 	IPA_MEM_AP_PROC_CTX,		/* 0 canaries */
-	IPA_MEM_NAT_TABLE,		/* 4 canaries (IPA v4.5 and above) */
-	IPA_MEM_PDN_CONFIG,		/* 0/2 canaries (IPA v4.0 and above) */
-	IPA_MEM_STATS_QUOTA_MODEM,	/* 2/4 canaries (IPA v4.0 and above) */
-	IPA_MEM_STATS_QUOTA_AP,		/* 0 canaries (IPA v4.0 and above) */
-	IPA_MEM_STATS_TETHERING,	/* 0 canaries (IPA v4.0 and above) */
+	IPA_MEM_MODEM,			/* 0/2 canaries */
+	IPA_MEM_UC_EVENT_RING,		/* 1 canary, optional */
+	IPA_MEM_PDN_CONFIG,		/* 0/2 canaries (IPA v4.0+) */
+	IPA_MEM_STATS_QUOTA_MODEM,	/* 2/4 canaries (IPA v4.0+) */
+	IPA_MEM_STATS_QUOTA_AP,		/* 0 canaries, optional (IPA v4.0+) */
+	IPA_MEM_STATS_TETHERING,	/* 0 canaries (IPA v4.0+) */
+	IPA_MEM_STATS_DROP,		/* 0 canaries, optional (IPA v4.0+) */
+	/* The next 5 filter and route statistics regions are optional */
 	IPA_MEM_STATS_V4_FILTER,	/* 0 canaries (IPA v4.0-v4.2) */
 	IPA_MEM_STATS_V6_FILTER,	/* 0 canaries (IPA v4.0-v4.2) */
 	IPA_MEM_STATS_V4_ROUTE,		/* 0 canaries (IPA v4.0-v4.2) */
 	IPA_MEM_STATS_V6_ROUTE,		/* 0 canaries (IPA v4.0-v4.2) */
-	IPA_MEM_STATS_FILTER_ROUTE,	/* 0 canaries (IPA v4.5 and above) */
-	IPA_MEM_STATS_DROP,		/* 0 canaries (IPA v4.0 and above) */
-	IPA_MEM_MODEM,			/* 0/2 canaries */
-	IPA_MEM_UC_EVENT_RING,		/* 1 canary */
+	IPA_MEM_STATS_FILTER_ROUTE,	/* 0 canaries (IPA v4.5+) */
+	IPA_MEM_NAT_TABLE,		/* 4 canaries, optional (IPA v4.5+) */
 	IPA_MEM_END_MARKER,		/* 1 canary (not a real region) */
 	IPA_MEM_COUNT,			/* Number of regions (not an index) */
 };