Merge branch 'perf/core' into perf/uprobes

Merge in latest upstream (and the latest perf development tree),
to prepare for tooling changes, and also to pick up v3.4 MM
changes that the uprobes code needs to take care of.

Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 104 insertions, 43 deletions

diff --git a/drivers/net/caif/caif_hsi.c b/drivers/net/caif/caif_hsi.c
index 0a4fc62a381d..9a66e2a910ae 100644
--- a/drivers/net/caif/caif_hsi.c
+++ b/drivers/net/caif/caif_hsi.c
@@ -426,6 +426,35 @@ static int cfhsi_rx_desc(struct cfhsi_desc *desc, struct cfhsi *cfhsi)
 	return xfer_sz;
 }
 
+static int cfhsi_rx_desc_len(struct cfhsi_desc *desc)
+{
+	int xfer_sz = 0;
+	int nfrms = 0;
+	u16 *plen;
+
+	if ((desc->header & ~CFHSI_PIGGY_DESC) ||
+			(desc->offset > CFHSI_MAX_EMB_FRM_SZ)) {
+
+		pr_err("Invalid descriptor. %x %x\n", desc->header,
+				desc->offset);
+		return -EPROTO;
+	}
+
+	/* Calculate transfer length. */
+	plen = desc->cffrm_len;
+	while (nfrms < CFHSI_MAX_PKTS && *plen) {
+		xfer_sz += *plen;
+		plen++;
+		nfrms++;
+	}
+
+	if (xfer_sz % 4) {
+		pr_err("Invalid payload len: %d, ignored.\n", xfer_sz);
+		return -EPROTO;
+	}
+	return xfer_sz;
+}
+
 static int cfhsi_rx_pld(struct cfhsi_desc *desc, struct cfhsi *cfhsi)
 {
 	int rx_sz = 0;
@@ -517,8 +546,10 @@ static int cfhsi_rx_pld(struct cfhsi_desc *desc, struct cfhsi *cfhsi)
 static void cfhsi_rx_done(struct cfhsi *cfhsi)
 {
 	int res;
-	int desc_pld_len = 0;
+	int desc_pld_len = 0, rx_len, rx_state;
 	struct cfhsi_desc *desc = NULL;
+	u8 *rx_ptr, *rx_buf;
+	struct cfhsi_desc *piggy_desc = NULL;
 
 	desc = (struct cfhsi_desc *)cfhsi->rx_buf;
 
@@ -534,65 +565,71 @@ static void cfhsi_rx_done(struct cfhsi *cfhsi)
 	spin_unlock_bh(&cfhsi->lock);
 
 	if (cfhsi->rx_state.state == CFHSI_RX_STATE_DESC) {
-		desc_pld_len = cfhsi_rx_desc(desc, cfhsi);
-		if (desc_pld_len == -ENOMEM)
-			goto restart;
-		if (desc_pld_len == -EPROTO)
+		desc_pld_len = cfhsi_rx_desc_len(desc);
+
+		if (desc_pld_len < 0)
 			goto out_of_sync;
+
+		rx_buf = cfhsi->rx_buf;
+		rx_len = desc_pld_len;
+		if (desc_pld_len > 0 && (desc->header & CFHSI_PIGGY_DESC))
+			rx_len += CFHSI_DESC_SZ;
+		if (desc_pld_len == 0)
+			rx_buf = cfhsi->rx_flip_buf;
 	} else {
-		int pld_len;
+		rx_buf = cfhsi->rx_flip_buf;
 
-		if (!cfhsi->rx_state.piggy_desc) {
-			pld_len = cfhsi_rx_pld(desc, cfhsi);
-			if (pld_len == -ENOMEM)
-				goto restart;
-			if (pld_len == -EPROTO)
-				goto out_of_sync;
-			cfhsi->rx_state.pld_len = pld_len;
-		} else {
-			pld_len = cfhsi->rx_state.pld_len;
-		}
+		rx_len = CFHSI_DESC_SZ;
+		if (cfhsi->rx_state.pld_len > 0 &&
+				(desc->header & CFHSI_PIGGY_DESC)) {
 
-		if ((pld_len > 0) && (desc->header & CFHSI_PIGGY_DESC)) {
-			struct cfhsi_desc *piggy_desc;
 			piggy_desc = (struct cfhsi_desc *)
 				(desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ +
-						pld_len);
+						cfhsi->rx_state.pld_len);
+
 			cfhsi->rx_state.piggy_desc = true;
 
-			/* Extract piggy-backed descriptor. */
-			desc_pld_len = cfhsi_rx_desc(piggy_desc, cfhsi);
-			if (desc_pld_len == -ENOMEM)
-				goto restart;
+			/* Extract payload len from piggy-backed descriptor. */
+			desc_pld_len = cfhsi_rx_desc_len(piggy_desc);
+			if (desc_pld_len < 0)
+				goto out_of_sync;
+
+			if (desc_pld_len > 0)
+				rx_len = desc_pld_len;
+
+			if (desc_pld_len > 0 &&
+					(piggy_desc->header & CFHSI_PIGGY_DESC))
+				rx_len += CFHSI_DESC_SZ;
 
 			/*
 			 * Copy needed information from the piggy-backed
 			 * descriptor to the descriptor in the start.
 			 */
-			memcpy((u8 *)desc, (u8 *)piggy_desc,
+			memcpy(rx_buf, (u8 *)piggy_desc,
 					CFHSI_DESC_SHORT_SZ);
-
+			/* Mark no embedded frame here */
+			piggy_desc->offset = 0;
 			if (desc_pld_len == -EPROTO)
 				goto out_of_sync;
 		}
 	}
 
-	memset(&cfhsi->rx_state, 0, sizeof(cfhsi->rx_state));
 	if (desc_pld_len) {
-		cfhsi->rx_state.state = CFHSI_RX_STATE_PAYLOAD;
-		cfhsi->rx_ptr = cfhsi->rx_buf + CFHSI_DESC_SZ;
-		cfhsi->rx_len = desc_pld_len;
+		rx_state = CFHSI_RX_STATE_PAYLOAD;
+		rx_ptr = rx_buf + CFHSI_DESC_SZ;
 	} else {
-		cfhsi->rx_state.state = CFHSI_RX_STATE_DESC;
-		cfhsi->rx_ptr = cfhsi->rx_buf;
-		cfhsi->rx_len = CFHSI_DESC_SZ;
+		rx_state = CFHSI_RX_STATE_DESC;
+		rx_ptr = rx_buf;
+		rx_len = CFHSI_DESC_SZ;
 	}
 
+	/* Initiate next read */
 	if (test_bit(CFHSI_AWAKE, &cfhsi->bits)) {
 		/* Set up new transfer. */
 		dev_dbg(&cfhsi->ndev->dev, "%s: Start RX.\n",
-			__func__);
-		res = cfhsi->dev->cfhsi_rx(cfhsi->rx_ptr, cfhsi->rx_len,
+				__func__);
+
+		res = cfhsi->dev->cfhsi_rx(rx_ptr, rx_len,
 				cfhsi->dev);
 		if (WARN_ON(res < 0)) {
 			dev_err(&cfhsi->ndev->dev, "%s: RX error %d.\n",
@@ -601,16 +638,32 @@ static void cfhsi_rx_done(struct cfhsi *cfhsi)
 			cfhsi->ndev->stats.rx_dropped++;
 		}
 	}
-	return;
 
-restart:
-	if (++cfhsi->rx_state.retries > CFHSI_MAX_RX_RETRIES) {
-		dev_err(&cfhsi->ndev->dev, "%s: No memory available "
-			"in %d iterations.\n",
-			__func__, CFHSI_MAX_RX_RETRIES);
-		BUG();
+	if (cfhsi->rx_state.state == CFHSI_RX_STATE_DESC) {
+		/* Extract payload from descriptor */
+		if (cfhsi_rx_desc(desc, cfhsi) < 0)
+			goto out_of_sync;
+	} else {
+		/* Extract payload */
+		if (cfhsi_rx_pld(desc, cfhsi) < 0)
+			goto out_of_sync;
+		if (piggy_desc) {
+			/* Extract any payload in piggyback descriptor. */
+			if (cfhsi_rx_desc(piggy_desc, cfhsi) < 0)
+				goto out_of_sync;
+		}
 	}
-	mod_timer(&cfhsi->rx_slowpath_timer, jiffies + 1);
+
+	/* Update state info */
+	memset(&cfhsi->rx_state, 0, sizeof(cfhsi->rx_state));
+	cfhsi->rx_state.state = rx_state;
+	cfhsi->rx_ptr = rx_ptr;
+	cfhsi->rx_len = rx_len;
+	cfhsi->rx_state.pld_len = desc_pld_len;
+	cfhsi->rx_state.piggy_desc = desc->header & CFHSI_PIGGY_DESC;
+
+	if (rx_buf != cfhsi->rx_buf)
+		swap(cfhsi->rx_buf, cfhsi->rx_flip_buf);
 	return;
 
 out_of_sync:
@@ -978,7 +1031,7 @@ static void cfhsi_setup(struct net_device *dev)
 	dev->netdev_ops = &cfhsi_ops;
 	dev->type = ARPHRD_CAIF;
 	dev->flags = IFF_POINTOPOINT | IFF_NOARP;
-	dev->mtu = CFHSI_MAX_PAYLOAD_SZ;
+	dev->mtu = CFHSI_MAX_CAIF_FRAME_SZ;
 	dev->tx_queue_len = 0;
 	dev->destructor = free_netdev;
 	skb_queue_head_init(&cfhsi->qhead);
@@ -1040,6 +1093,12 @@ int cfhsi_probe(struct platform_device *pdev)
 		goto err_alloc_rx;
 	}
 
+	cfhsi->rx_flip_buf = kzalloc(CFHSI_BUF_SZ_RX, GFP_KERNEL);
+	if (!cfhsi->rx_flip_buf) {
+		res = -ENODEV;
+		goto err_alloc_rx_flip;
+	}
+
 	/* Pre-calculate inactivity timeout. */
 	if (inactivity_timeout != -1) {
 		cfhsi->inactivity_timeout =
@@ -1138,6 +1197,8 @@ int cfhsi_probe(struct platform_device *pdev)
  err_activate:
 	destroy_workqueue(cfhsi->wq);
  err_create_wq:
+	kfree(cfhsi->rx_flip_buf);
+ err_alloc_rx_flip:
 	kfree(cfhsi->rx_buf);
  err_alloc_rx:
 	kfree(cfhsi->tx_buf);