linux-kernel - [PATCH v2 09/15] dmaengine: bcm2835: make address increment platform independent

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <0bf87ad0dc970c34199fd6bc6dbd19b47d382066.1710226514.git.andrea.porta@suse.com>
Date: Wed, 13 Mar 2024 15:08:34 +0100
From: Andrea della Porta <andrea.porta@...e.com>
To: Vinod Koul <vkoul@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Ray Jui <rjui@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Saenz Julienne <nsaenz@...nel.org>,
	dmaengine@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	dave.stevenson@...pberrypi.com
Cc: Phil Elwell <phil@...pberrypi.org>,
	Maxime Ripard <maxime@...no.tech>,
	Stefan Wahren <stefan.wahren@...e.com>,
	Dom Cobley <popcornmix@...il.com>,
	Andrea della Porta <andrea.porta@...e.com>
Subject: [PATCH v2 09/15] dmaengine: bcm2835: make address increment platform independent

Actually the criteria to increment source & destination address doesn't
based on platform specific bits. It's just the DMA transfer direction which
is translated into the info bits. So introduce two new helper functions
and get the rid of these platform specifics.

Signed-off-by: Stefan Wahren <stefan.wahren@...e.com>
Signed-off-by: Andrea della Porta <andrea.porta@...e.com>
---
 drivers/dma/bcm2835-dma.c | 28 ++++++++++++++++++++++------
 1 file changed, 22 insertions(+), 6 deletions(-)

diff --git a/drivers/dma/bcm2835-dma.c b/drivers/dma/bcm2835-dma.c
index b633c40142fe..6f896bb1a4fe 100644
--- a/drivers/dma/bcm2835-dma.c
+++ b/drivers/dma/bcm2835-dma.c
@@ -274,6 +274,24 @@ static u32 bcm2835_dma_prepare_cb_extra(struct bcm2835_chan *c,
 	return result;
 }
 
+static inline bool need_src_incr(enum dma_transfer_direction direction)
+{
+	return direction != DMA_DEV_TO_MEM;
+}
+
+static inline bool need_dst_incr(enum dma_transfer_direction direction)
+{
+	switch (direction) {
+	case DMA_MEM_TO_MEM:
+	case DMA_DEV_TO_MEM:
+		return true;
+	default:
+		break;
+	}
+
+	return false;
+}
+
 static void bcm2835_dma_free_cb_chain(struct bcm2835_desc *desc)
 {
 	size_t i;
@@ -355,10 +373,8 @@ static inline size_t bcm2835_dma_count_frames_for_sg(struct bcm2835_chan *c,
  * @cyclic:         it is a cyclic transfer
  * @info:           the default info bits to apply per controlblock
  * @frames:         number of controlblocks to allocate
- * @src:            the src address to assign (if the S_INC bit is set
- *                  in @info, then it gets incremented)
- * @dst:            the dst address to assign (if the D_INC bit is set
- *                  in @info, then it gets incremented)
+ * @src:            the src address to assign
+ * @dst:            the dst address to assign
  * @buf_len:        the full buffer length (may also be 0)
  * @period_len:     the period length when to apply @finalextrainfo
  *                  in addition to the last transfer
@@ -430,9 +446,9 @@ static struct bcm2835_desc *bcm2835_dma_create_cb_chain(
 			d->cb_list[frame - 1].cb->next = cb_entry->paddr;
 
 		/* update src and dst and length */
-		if (src && (info & BCM2835_DMA_S_INC))
+		if (src && need_src_incr(direction))
 			src += control_block->length;
-		if (dst && (info & BCM2835_DMA_D_INC))
+		if (dst && need_dst_incr(direction))
 			dst += control_block->length;
 
 		/* Length of total transfer */
-- 
2.35.3