msm: ipa: Fix init and add overflow check for drop stats

Fix init_drop_stats to have it only enable 4 pipes max.
Enable different pipes depending on kernel version.
Use more descriptive names for WLAN2_CONS pipes drop stats.
Add a temp variable to not enable drop stats bitmask when # of
pipes is more than allocated.

Change-Id: I3d678569eb94bfd43d90d2d4f84f5b1148b8ec42
Signed-off-by: Michael Adisumarta <madisuma@codeaurora.org>

drivers/platform/msm/ipa/ipa_v3/ipa_hw_stats.c

@@ -1835,35 +1835,44 @@ int ipa_drop_stats_init(void)
 	u32 reg_idx;
 	u32 mask, pipe_bitmask[IPA_EP_ARR_SIZE] = {0};
 
-	/* If HOLB Monitoring is enabled, enable drop stats for USB and WLAN. */
-	if (ipa3_ctx->uc_ctx.ipa_use_uc_holb_monitor) {
 	mask = ipa_hw_stats_get_ep_bit_n_idx(
 		IPA_CLIENT_USB_CONS,
 		&reg_idx);
 	pipe_bitmask[reg_idx] |= mask;
 
+	if (ipa3_ctx->ipa_wdi3_5g_holb_timeout || ipa3_ctx->uc_ctx.ipa_use_uc_holb_monitor) {
 		mask = ipa_hw_stats_get_ep_bit_n_idx(
 			IPA_CLIENT_WLAN2_CONS,
 			&reg_idx);
 		pipe_bitmask[reg_idx] |= mask;
 	}
+
+	if (ipa3_ctx->platform_type == IPA_PLAT_TYPE_MDM) {
+		if (ipa3_ctx->ipa_wdi3_2g_holb_timeout) {
+			mask = ipa_hw_stats_get_ep_bit_n_idx(
+				IPA_CLIENT_WLAN2_CONS1,
+				&reg_idx);
+			pipe_bitmask[reg_idx] |= mask;
+		}
+
 		if (ipa3_ctx->use_tput_est_ep) {
 			mask = ipa_hw_stats_get_ep_bit_n_idx(
 				IPA_CLIENT_TPUT_CONS,
 				&reg_idx);
 			pipe_bitmask[reg_idx] |= mask;
+
 		}
-	/* Always enable drop stats for USB DPL Pipe. */
+	} else {
 		mask = ipa_hw_stats_get_ep_bit_n_idx(
 			IPA_CLIENT_USB_DPL_CONS,
 			&reg_idx);
 		pipe_bitmask[reg_idx] |= mask;
 
-	/* Always enable drop stats for ODL DPL Pipe. */
 		mask = ipa_hw_stats_get_ep_bit_n_idx(
 			IPA_CLIENT_ODL_DPL_CONS,
 			&reg_idx);
 		pipe_bitmask[reg_idx] |= mask;
+	}
 
 	/* Currently we have option to enable drop stats using debugfs.
 	 * To enable drop stats for a different pipe, first user needs
@@ -1886,6 +1895,7 @@ int ipa_init_drop_stats(u32 *pipe_bitmask)
 		{0};
 	struct ipahal_imm_cmd_pyld *coal_cmd_pyld = NULL;
 	struct ipa3_desc desc[IPA_INIT_DROP_STATS_MAX_CMD_NUM] = { {0} };
+	struct ipa_hw_stats_drop tmp_drop;
 	dma_addr_t dma_address;
 	int ret, i;
 	int num_cmd = 0;
@@ -1896,28 +1906,34 @@ int ipa_init_drop_stats(u32 *pipe_bitmask)
 	if (!pipe_bitmask)
 		return -EPERM;
 
-	/* reset driver's cache */
+	/* check if IPA has enough space for # of pipes drop stats enabled*/
-	memset(&ipa3_ctx->hw_stats->drop, 0, sizeof(ipa3_ctx->hw_stats->drop));
+	memset(&tmp_drop, 0, sizeof(tmp_drop));
 	for (i = 0; i < IPA5_PIPE_REG_NUM; i++) {
-		ipa3_ctx->hw_stats->drop.init.enabled_bitmask[i] =
+		tmp_drop.init.enabled_bitmask[i] = pipe_bitmask[i];
-			pipe_bitmask[i];
 		IPADBG_LOW("pipe_bitmask[%d]=0x%x\n", i, pipe_bitmask[i]);
 	}
 
 	pyld = ipahal_stats_generate_init_pyld(IPAHAL_HW_STATS_DROP,
-		&ipa3_ctx->hw_stats->drop.init, false);
+		&tmp_drop.init, false);
 	if (!pyld) {
 		IPAERR("failed to generate pyld\n");
 		return -EPERM;
 	}
 
 	if (pyld->len > IPA_MEM_PART(stats_drop_size)) {
-		IPAERR("SRAM partition too small: %d needed %d\n",
+		IPAERR("SRAM partition too small: %d bytes (%d pipes)."
-			IPA_MEM_PART(stats_drop_size), pyld->len);
+			"Tried to add %d bytes (%d pipes)."
+			"Please disable some stats before adding new ones.\n",
+			IPA_MEM_PART(stats_drop_size), IPA_MEM_PART(stats_drop_size)/8,
+			pyld->len, pyld->len/8);
 		ret = -EPERM;
 		goto destroy_init_pyld;
 	}
 
+	/* reset driver's cache and copy the bitmask of new drop enabled pipes */
+	memset(&ipa3_ctx->hw_stats->drop, 0, sizeof(ipa3_ctx->hw_stats->drop));
+	ipa3_ctx->hw_stats->drop = tmp_drop;
+
 	dma_address = dma_map_single(ipa3_ctx->pdev,
 		pyld->data,
 		pyld->len,
@@ -2629,11 +2645,21 @@ static ssize_t ipa_debugfs_print_drop_stats(struct file *file,
 			ipahal_get_ep_bit(ep_idx)))
 			continue;
 
-
+		/* Use more descriptive names for WLAN2_CONS pipes */
+		if(i == IPA_CLIENT_WLAN2_CONS) {
+			nbytes += scnprintf(dbg_buff + nbytes,
+				IPA_MAX_MSG_LEN - nbytes,
+				"IPA_CLIENT_WLAN2_HIGHSPEED_CONS:\n");
+		} else if(i == IPA_CLIENT_WLAN2_CONS1) {
+			nbytes += scnprintf(dbg_buff + nbytes,
+				IPA_MAX_MSG_LEN - nbytes,
+				" IPA_CLIENT_WLAN2_LOWSPEED_CONS:\n");
+		} else {
 			nbytes += scnprintf(dbg_buff + nbytes,
 				IPA_MAX_MSG_LEN - nbytes,
 				"%s:\n",
 				ipa_clients_strings[i]);
+		}
 
 		nbytes += scnprintf(dbg_buff + nbytes,
 			IPA_MAX_MSG_LEN - nbytes,