linux-kernel - [PATCH -mm] sata_nv: wait for response on entering/leaving ADMA mode

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>] [day] [month] [year] [list]

Message-id: <45C6BD87.90802@shaw.ca>
Date:	Sun, 04 Feb 2007 23:15:51 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org, Jeff Garzik <jeff@...zik.org>,
	Andrew Morton <akpm@...l.org>
Subject: [PATCH -mm] sata_nv: wait for response on entering/leaving ADMA mode

Update sata_nv to wait for the controller to indicate via the status register
that it has entered the requested state when switching between ADMA mode and
register mode. This issue came up recently when debugging some problems with
cache flush command timeouts and while it didn't appear to fix that problem,
this is something we should likely be doing in any case.

Signed-off-by: Robert Hancock <hancockr@...w.ca>

--- linux-2.6.20-rc6-mm3/drivers/ata/sata_nv.c	2007-02-04 21:48:25.000000000 -0600
+++ linux-2.6.20-rc6-mm3edit/drivers/ata/sata_nv.c	2007-02-04 22:13:36.000000000 -0600
@@ -507,14 +507,38 @@ static void nv_adma_register_mode(struct
{
	struct nv_adma_port_priv *pp = ap->private_data;
	void __iomem *mmio = pp->ctl_block;
-	u16 tmp;
+	u16 tmp, status;
+	int count = 0;

	if (pp->flags & NV_ADMA_PORT_REGISTER_MODE)
		return;

+	status = readw(mmio + NV_ADMA_STAT);
+	while(!(status & NV_ADMA_STAT_IDLE) && count < 20) {
+		ndelay(50);
+		status = readw(mmio + NV_ADMA_STAT);
+		count++;
+	}
+	if(count == 20)
+		ata_port_printk(ap, KERN_WARNING,
+			"timeout waiting for ADMA IDLE, stat=0x%hx\n",
+			status);
+
	tmp = readw(mmio + NV_ADMA_CTL);
	writew(tmp & ~NV_ADMA_CTL_GO, mmio + NV_ADMA_CTL);

+	count = 0;
+	status = readw(mmio + NV_ADMA_STAT);
+	while(!(status & NV_ADMA_STAT_LEGACY) && count < 20) {
+		ndelay(50);
+		status = readw(mmio + NV_ADMA_STAT);
+		count++;
+	}
+	if(count == 20)
+		ata_port_printk(ap, KERN_WARNING,
+			 "timeout waiting for ADMA LEGACY, stat=0x%hx\n",
+			 status);
+
	pp->flags |= NV_ADMA_PORT_REGISTER_MODE;
}

@@ -522,7 +546,8 @@ static void nv_adma_mode(struct ata_port
{
	struct nv_adma_port_priv *pp = ap->private_data;
	void __iomem *mmio = pp->ctl_block;
-	u16 tmp;
+	u16 tmp, status;
+	int count = 0;

	if (!(pp->flags & NV_ADMA_PORT_REGISTER_MODE))
		return;
@@ -532,6 +557,18 @@ static void nv_adma_mode(struct ata_port
	tmp = readw(mmio + NV_ADMA_CTL);
	writew(tmp | NV_ADMA_CTL_GO, mmio + NV_ADMA_CTL);

+	status = readw(mmio + NV_ADMA_STAT);
+	while(((status & NV_ADMA_STAT_LEGACY) ||
+	      !(status & NV_ADMA_STAT_IDLE)) && count < 20) {
+		ndelay(50);
+		status = readw(mmio + NV_ADMA_STAT);
+		count++;
+	}
+	if(count == 20)
+		ata_port_printk(ap, KERN_WARNING,
+			"timeout waiting for ADMA LEGACY clear and IDLE, stat=0x%hx\n",
+			status);
+
	pp->flags &= ~NV_ADMA_PORT_REGISTER_MODE;
}



-
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/