linux-kernel - [PATCH 7/7] dw_dmac.c: Pass Channel Allocation Priority from platform

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]

Date:	Thu, 17 Feb 2011 12:54:57 +0530
From:	Viresh Kumar <viresh.kumar@...com>
To:	<dan.j.williams@...el.com>, <linux-kernel@...r.kernel.org>
Cc:	<shiraz.hashim@...com>, <amit.goel@...com>,
	<armando.visconti@...com>, Viresh KUMAR <viresh.kumar@...com>
Subject: [PATCH 7/7] dw_dmac.c: Pass Channel Allocation Priority from platform_data

From: Viresh KUMAR <viresh.kumar@...com>

In SPEAr Platform channels 4-7 have more Fifo depth. So we must get better
channel first. This patch introduces concept of channel allocation priority in
dw_dmac. If user doesn't paas anything or 0, than normal (ascending) channel
allocation will follow, else channels will be allocated in descending order.

Signed-off-by: Viresh Kumar <viresh.kumar@...com>
---
 drivers/dma/dw_dmac.c   |    6 +++++-
 include/linux/dw_dmac.h |    3 +++
 2 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index 01f783d..d4bf956 100644
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -1314,7 +1314,11 @@ static int __init dw_probe(struct platform_device *pdev)
 		dwc->chan.device = &dw->dma;
 		dwc->chan.cookie = dwc->completed = 1;
 		dwc->chan.chan_id = i;
-		list_add_tail(&dwc->chan.device_node, &dw->dma.channels);
+		if (pdata->chan_priority == CHAN_PRIO_ASCENDING)
+			list_add_tail(&dwc->chan.device_node,
+					&dw->dma.channels);
+		else
+			list_add(&dwc->chan.device_node, &dw->dma.channels);
 
 		dwc->ch_regs = &__dw_regs(dw)->CHAN[i];
 		spin_lock_init(&dwc->lock);
diff --git a/include/linux/dw_dmac.h b/include/linux/dw_dmac.h
index c8aad71..b1ab0b9 100644
--- a/include/linux/dw_dmac.h
+++ b/include/linux/dw_dmac.h
@@ -19,6 +19,9 @@
  */
 struct dw_dma_platform_data {
 	unsigned int	nr_channels;
+#define CHAN_PRIO_ASCENDING	0	/* zero to seven */
+#define CHAN_PRIO_DESCENDING	1	/* seven to zero */
+	unsigned int	chan_priority;
 };
 
 /**
-- 
1.7.2.2

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/