net: ipa: fix some register validity checks

A recent commit defined HW_PARAM_4 as a GSI register ID but did not
add it to gsi_reg_id_valid() to indicate it's valid (for IPA v5.0+).
Add version checks for the HW_PARAM_2 and INTER_EE IRQ GSI registers
there as well.

IPA v5.0 supports up to 8 source and destination resource groups.
Update the validity check (and the comments where the register IDs
are defined) to reflect that.  Similarly update comments and
validity checks for the hash/cache-related registers.

Note that this patch fixes an omission and constrains things
further, but these don't technically represent bugs.

Fixes: f651334 ("net: ipa: add HW_PARAM_4 GSI register")
Signed-off-by: Alex Elder <[email protected]>
Signed-off-by: Jakub Kicinski <[email protected]>

Author: Alex Elder

drivers/net/ipa/gsi_reg.c

@@ -15,6 +15,14 @@ static bool gsi_reg_id_valid(struct gsi *gsi, enum gsi_reg_id reg_id)
 	switch (reg_id) {
 	case INTER_EE_SRC_CH_IRQ_MSK:
 	case INTER_EE_SRC_EV_CH_IRQ_MSK:
+		return gsi->version >= IPA_VERSION_3_5;
+
+	case HW_PARAM_2:
+		return gsi->version >= IPA_VERSION_3_5_1;
+
+	case HW_PARAM_4:
+		return gsi->version >= IPA_VERSION_5_0;
+
 	case CH_C_CNTXT_0:
 	case CH_C_CNTXT_1:
 	case CH_C_CNTXT_2:
@@ -43,7 +51,6 @@ static bool gsi_reg_id_valid(struct gsi *gsi, enum gsi_reg_id reg_id)
 	case CH_CMD:
 	case EV_CH_CMD:
 	case GENERIC_CMD:
-	case HW_PARAM_2:
 	case CNTXT_TYPE_IRQ:
 	case CNTXT_TYPE_IRQ_MSK:
 	case CNTXT_SRC_CH_IRQ:

drivers/net/ipa/ipa_reg.c

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 
 /* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
- * Copyright (C) 2019-2022 Linaro Ltd.
+ * Copyright (C) 2019-2023 Linaro Ltd.
  */
 
 #include <linux/io.h>
@@ -15,6 +15,17 @@ static bool ipa_reg_id_valid(struct ipa *ipa, enum ipa_reg_id reg_id)
 	enum ipa_version version = ipa->version;
 
 	switch (reg_id) {
+	case FILT_ROUT_HASH_EN:
+		return version == IPA_VERSION_4_2;
+
+	case FILT_ROUT_HASH_FLUSH:
+		return version < IPA_VERSION_5_0 && version != IPA_VERSION_4_2;
+
+	case FILT_ROUT_CACHE_FLUSH:
+	case ENDP_FILTER_CACHE_CFG:
+	case ENDP_ROUTER_CACHE_CFG:
+		return version >= IPA_VERSION_5_0;
+
 	case IPA_BCR:
 	case COUNTER_CFG:
 		return version < IPA_VERSION_4_5;
@@ -32,11 +43,13 @@ static bool ipa_reg_id_valid(struct ipa *ipa, enum ipa_reg_id reg_id)
 	case SRC_RSRC_GRP_45_RSRC_TYPE:
 	case DST_RSRC_GRP_45_RSRC_TYPE:
 		return version <= IPA_VERSION_3_1 ||
-		       version == IPA_VERSION_4_5;
+		       version == IPA_VERSION_4_5 ||
+		       version == IPA_VERSION_5_0;
 
 	case SRC_RSRC_GRP_67_RSRC_TYPE:
 	case DST_RSRC_GRP_67_RSRC_TYPE:
-		return version <= IPA_VERSION_3_1;
+		return version <= IPA_VERSION_3_1 ||
+		       version == IPA_VERSION_5_0;
 
 	case ENDP_FILTER_ROUTER_HSH_CFG:
 		return version < IPA_VERSION_5_0 &&
@@ -52,9 +65,6 @@ static bool ipa_reg_id_valid(struct ipa *ipa, enum ipa_reg_id reg_id)
 	case SHARED_MEM_SIZE:
 	case QSB_MAX_WRITES:
 	case QSB_MAX_READS:
-	case FILT_ROUT_HASH_EN:
-	case FILT_ROUT_HASH_FLUSH:
-	case FILT_ROUT_CACHE_FLUSH:
 	case STATE_AGGR_ACTIVE:
 	case LOCAL_PKT_PROC_CNTXT:
 	case AGGR_FORCE_CLOSE:
@@ -76,8 +86,6 @@ static bool ipa_reg_id_valid(struct ipa *ipa, enum ipa_reg_id reg_id)
 	case ENDP_INIT_RSRC_GRP:
 	case ENDP_INIT_SEQ:
 	case ENDP_STATUS:
-	case ENDP_FILTER_CACHE_CFG:
-	case ENDP_ROUTER_CACHE_CFG:
 	case IPA_IRQ_STTS:
 	case IPA_IRQ_EN:
 	case IPA_IRQ_CLR:

drivers/net/ipa/ipa_reg.h

@@ -60,8 +60,8 @@ enum ipa_reg_id {
 	SHARED_MEM_SIZE,
 	QSB_MAX_WRITES,
 	QSB_MAX_READS,
-	FILT_ROUT_HASH_EN,				/* Not IPA v5.0+ */
-	FILT_ROUT_HASH_FLUSH,				/* Not IPA v5.0+ */
+	FILT_ROUT_HASH_EN,				/* IPA v4.2 */
+	FILT_ROUT_HASH_FLUSH,			/* Not IPA v4.2 nor IPA v5.0+ */
 	FILT_ROUT_CACHE_FLUSH,				/* IPA v5.0+ */
 	STATE_AGGR_ACTIVE,
 	IPA_BCR,					/* Not IPA v4.5+ */
@@ -76,12 +76,12 @@ enum ipa_reg_id {
 	TIMERS_PULSE_GRAN_CFG,				/* IPA v4.5+ */
 	SRC_RSRC_GRP_01_RSRC_TYPE,
 	SRC_RSRC_GRP_23_RSRC_TYPE,
-	SRC_RSRC_GRP_45_RSRC_TYPE,		/* Not IPA v3.5+, IPA v4.5 */
-	SRC_RSRC_GRP_67_RSRC_TYPE,			/* Not IPA v3.5+ */
+	SRC_RSRC_GRP_45_RSRC_TYPE,	/* Not IPA v3.5+; IPA v4.5, IPA v5.0 */
+	SRC_RSRC_GRP_67_RSRC_TYPE,		/* Not IPA v3.5+; IPA v5.0 */
 	DST_RSRC_GRP_01_RSRC_TYPE,
 	DST_RSRC_GRP_23_RSRC_TYPE,
-	DST_RSRC_GRP_45_RSRC_TYPE,		/* Not IPA v3.5+, IPA v4.5 */
-	DST_RSRC_GRP_67_RSRC_TYPE,			/* Not IPA v3.5+ */
+	DST_RSRC_GRP_45_RSRC_TYPE,	/* Not IPA v3.5+; IPA v4.5, IPA v5.0 */
+	DST_RSRC_GRP_67_RSRC_TYPE,		/* Not IPA v3.5+; IPA v5.0 */
 	ENDP_INIT_CTRL,		/* Not IPA v4.2+ for TX, not IPA v4.0+ for RX */
 	ENDP_INIT_CFG,
 	ENDP_INIT_NAT,			/* TX only */