openwrt/target/linux/layerscape/patches-5.4/701-net-0040-fsl_qbman-usdpaa-Invalidate-software-portals-before-.patch

From 6506f95ad4d47500275c2f3a48abb7f3de11c54b Mon Sep 17 00:00:00 2001
From: Roy Pledge <roy.pledge@nxp.com>
Date: Thu, 25 May 2017 16:59:08 -0400
Subject: [PATCH] fsl_qbman/usdpaa: Invalidate software portals before use

Invalidate the cache for the software portals before using them
since the portals are non coherent. This ensures that the core
using the portal is seeing the most up to date information in
case the cache contained older data. This is important during
the cleanup phase if cleanup occurs on a differnt core than
what the application was using.

Signed-off-by: Roy Pledge <roy.pledge@nxp.com>
---
 drivers/staging/fsl_qbman/fsl_usdpaa.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

--- a/drivers/staging/fsl_qbman/fsl_usdpaa.c
+++ b/drivers/staging/fsl_qbman/fsl_usdpaa.c
@@ -371,6 +371,16 @@ static int usdpaa_open(struct inode *ino
 
 #define DQRR_MAXFILL 15
 
+
+/* Invalidate a portal */
+void dbci_portal(void *addr)
+{
+	int i;
+
+	for (i = 0; i < 0x4000; i += 64)
+		dcbi(addr + i);
+}
+
 /* Reset a QMan portal to its default state */
 static int init_qm_portal(struct qm_portal_config *config,
 			  struct qm_portal *portal)
@@ -384,6 +394,13 @@ static int init_qm_portal(struct qm_port
 	/* Make sure interrupts are inhibited */
 	qm_out(IIR, 1);
 
+	/*
+	 * Invalidate the entire CE portal are to ensure no stale
+	 * cachelines are present.  This should be done on all
+	 * cores as the portal is mapped as M=0 (non-coherent).
+	 */
+	on_each_cpu(dbci_portal, portal->addr.addr_ce, 1);
+
 	/* Initialize the DQRR.  This will stop any dequeue
 	   commands that are in progress */
 	if (qm_dqrr_init(portal, config, qm_dqrr_dpush, qm_dqrr_pvb,
@@ -435,6 +452,13 @@ static int init_bm_portal(struct bm_port
 	portal->addr.addr_ce = config->addr_virt[DPA_PORTAL_CE];
 	portal->addr.addr_ci = config->addr_virt[DPA_PORTAL_CI];
 
+	/*
+	 * Invalidate the entire CE portal are to ensure no stale
+	 * cachelines are present.  This should be done on all
+	 * cores as the portal is mapped as M=0 (non-coherent).
+	 */
+	on_each_cpu(dbci_portal, portal->addr.addr_ce, 1);
+
 	if (bm_rcr_init(portal, bm_rcr_pvb, bm_rcr_cce)) {
 		pr_err("Bman RCR initialisation failed\n");
 	return 1;