linux-kernel - [PATCH] ohci: Turn remote DMA support into a module parameter

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Date:	Sun, 22 Dec 2013 11:34:22 +0100
From:	Lubomir Rintel <lkundrak@...sk>
To:	linux1394-devel@...ts.sourceforge.net
Cc:	linux-kernel@...r.kernel.org, Lubomir Rintel <lkundrak@...sk>,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>
Subject: [PATCH] ohci: Turn remote DMA support into a module parameter

This makes it possible to debug kernel over FireWire without the need to
recompile it.

Cc: Stefan Richter <stefanr@...6.in-berlin.de>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Signed-off-by: Lubomir Rintel <lkundrak@...sk>
---
 Documentation/debugging-via-ohci1394.txt |  4 +---
 drivers/firewire/ohci.c                  | 19 +++++++++++--------
 lib/Kconfig.debug                        | 11 -----------
 3 files changed, 12 insertions(+), 22 deletions(-)

diff --git a/Documentation/debugging-via-ohci1394.txt b/Documentation/debugging-via-ohci1394.txt
index 14d1944..73473aa 100644
--- a/Documentation/debugging-via-ohci1394.txt
+++ b/Documentation/debugging-via-ohci1394.txt
@@ -38,9 +38,7 @@ Drivers
 
 The firewire-ohci driver in drivers/firewire uses filtered physical
 DMA by default, which is more secure but not suitable for remote debugging.
-Compile the driver with CONFIG_FIREWIRE_OHCI_REMOTE_DMA (Kernel hacking menu:
-Remote debugging over FireWire with firewire-ohci) to get unfiltered physical
-DMA.
+Pass the remote_dma=1 parameter to the driver to get unfiltered physical DMA.
 
 Because the firewire-ohci driver depends on the PCI enumeration to be
 completed, an initialization routine which runs pretty early has been
diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index 6aa8a86..6313735 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -370,6 +370,10 @@ MODULE_PARM_DESC(debug, "Verbose logging (default = 0"
 	", busReset events = "	__stringify(OHCI_PARAM_DEBUG_BUSRESETS)
 	", or a combination, or all = -1)");
 
+static bool param_remote_dma;
+module_param_named(remote_dma, param_remote_dma, bool, 0444);
+MODULE_PARM_DESC(remote_dma, "Enable unfiltered remote DMA (default = 0)");
+
 static void log_irqs(struct fw_ohci *ohci, u32 evt)
 {
 	if (likely(!(param_debug &
@@ -2050,10 +2054,10 @@ static void bus_reset_work(struct work_struct *work)
 			  be32_to_cpu(ohci->next_header));
 	}
 
-#ifdef CONFIG_FIREWIRE_OHCI_REMOTE_DMA
-	reg_write(ohci, OHCI1394_PhyReqFilterHiSet, ~0);
-	reg_write(ohci, OHCI1394_PhyReqFilterLoSet, ~0);
-#endif
+	if (param_remote_dma) {
+		reg_write(ohci, OHCI1394_PhyReqFilterHiSet, ~0);
+		reg_write(ohci, OHCI1394_PhyReqFilterLoSet, ~0);
+	}
 
 	spin_unlock_irq(&ohci->lock);
 
@@ -2587,13 +2591,13 @@ static int ohci_cancel_packet(struct fw_card *card, struct fw_packet *packet)
 static int ohci_enable_phys_dma(struct fw_card *card,
 				int node_id, int generation)
 {
-#ifdef CONFIG_FIREWIRE_OHCI_REMOTE_DMA
-	return 0;
-#else
 	struct fw_ohci *ohci = fw_ohci(card);
 	unsigned long flags;
 	int n, ret = 0;
 
+	if (param_remote_dma)
+		return 0;
+
 	/*
 	 * FIXME:  Make sure this bitmask is cleared when we clear the busReset
 	 * interrupt bit.  Clear physReqResourceAllBuses on bus reset.
@@ -2622,7 +2626,6 @@ static int ohci_enable_phys_dma(struct fw_card *card,
 	spin_unlock_irqrestore(&ohci->lock, flags);
 
 	return ret;
-#endif /* CONFIG_FIREWIRE_OHCI_REMOTE_DMA */
 }
 
 static u32 ohci_read_csr(struct fw_card *card, int csr_offset)
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index db25707..dc30284 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1547,17 +1547,6 @@ config PROVIDE_OHCI1394_DMA_INIT
 
 	  See Documentation/debugging-via-ohci1394.txt for more information.
 
-config FIREWIRE_OHCI_REMOTE_DMA
-	bool "Remote debugging over FireWire with firewire-ohci"
-	depends on FIREWIRE_OHCI
-	help
-	  This option lets you use the FireWire bus for remote debugging
-	  with help of the firewire-ohci driver. It enables unfiltered
-	  remote DMA in firewire-ohci.
-	  See Documentation/debugging-via-ohci1394.txt for more information.
-
-	  If unsure, say N.
-
 config BUILD_DOCSRC
 	bool "Build targets in Documentation/ tree"
 	depends on HEADERS_CHECK
-- 
1.8.4.2

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