msm: ipa: Add API to set IPA client filtering table SRAM priority high

IPA client filtering table can reside in SRAM in case there is enough
space. Since SRAM is a limited resource it might also reside in slower
memory (DDR). This new API enables setting an IPA client's filtering
table SRAM priority to high. It also includes an IOCTL that enables
to use the API from user-space.
Moving an IPA client filtering table to SRAM greatly
improves access time to the filtering rules in it and therefore
the entire data path of this client.
Current limitation is this API needs to be called before filter
rules are installed.

Change-Id: I34814369b9c4f6ea535b739aed9a20df8606080b
Acked-by: Eliad Ben Yishay <[email protected]>
Signed-off-by: Ilia Lin <[email protected]>

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

@@ -3997,7 +3997,13 @@ static long ipa3_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 		}
 
 		break;
-
+#ifdef IPA_IOC_FLT_MEM_PERIPHERAL_SET_PRIO_HIGH
+	case IPA_IOC_FLT_MEM_PERIPHERAL_SET_PRIO_HIGH:
+		retval = ipa_flt_sram_set_client_prio_high((enum ipa_client_type) arg);
+		if (retval)
+			IPAERR("ipa_flt_sram_set_client_prio_high failed! retval=%d\n", retval);
+		break;
+#endif
 	default:
 		IPA_ACTIVE_CLIENTS_DEC_SIMPLE();
 		return -ENOTTY;

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

@@ -2217,3 +2217,42 @@ bail:
 	iounmap(ipa_sram_mmio);
 	return 0;
 }
+
+int ipa_flt_sram_set_client_prio_high(enum ipa_client_type client)
+{
+	int ipa_ep_idx = IPA_EP_NOT_ALLOCATED;
+	enum ipa_ip_type ip;
+
+	/* allow setting high priority only to ETH clients */
+	if (!IPA_CLIENT_IS_ETH_PROD(client)) {
+		IPAERR("Operation not permitted for non ETH clients\n");
+		return -EINVAL;
+	}
+
+	ipa_ep_idx = ipa_get_ep_mapping(client);
+	if (ipa_ep_idx == IPA_EP_NOT_ALLOCATED)
+		return -EINVAL;
+
+	if (!ipa_is_ep_support_flt(ipa_ep_idx))
+		return -EINVAL;
+
+	mutex_lock(&ipa3_ctx->lock);
+	for (ip = IPA_IP_v4; ip < IPA_IP_MAX; ip++) {
+		struct ipa3_flt_tbl_nhash_lcl *lcl_tbl, *tmp;
+		struct ipa3_flt_tbl *flt_tbl = &ipa3_ctx->flt_tbl[ipa_ep_idx][ip];
+		/* Position filtering table last in the list so, it will have first SRAM priority */
+		list_for_each_entry_safe(
+			lcl_tbl, tmp, &ipa3_ctx->flt_tbl_nhash_lcl_list[ip], link) {
+			if (lcl_tbl->tbl == flt_tbl) {
+				list_del(&lcl_tbl->link);
+				list_add_tail(&lcl_tbl->link,
+					&ipa3_ctx->flt_tbl_nhash_lcl_list[ip]);
+				break;
+			}
+		}
+	}
+	mutex_unlock(&ipa3_ctx->lock);
+
+	return 0;
+}
+

drivers/platform/msm/ipa/ipa_v3/ipa_i.h

@@ -887,7 +887,6 @@ struct ipa3_hdr_proc_ctx_tbl {
  * @rule_cnt: number of filter rules
  * @in_sys: flag indicating if filter table is located in system memory
  * @sz: the size of the filter tables
- * @end: the last header index
  * @curr_mem: current filter tables block in sys memory
  * @prev_mem: previous filter table block in sys memory
  * @rule_ids: common idr structure that holds the rule_id for each rule
@@ -2820,6 +2819,8 @@ int ipa3_commit_flt(enum ipa_ip_type ip);
 
 int ipa3_reset_flt(enum ipa_ip_type ip, bool user_only);
 
+int ipa_flt_sram_set_client_prio_high(enum ipa_client_type client);
+
 /*
  * NAT
  */