From 8bc588e0e585bc9085df75e84d4d5635f45cf360 Mon Sep 17 00:00:00 2001 From: Lubomir Rintel Date: Sun, 22 Dec 2013 11:34:22 +0100 Subject: firewire: ohci: Turn remote DMA support into a module parameter This makes it possible to debug kernel over FireWire without the need to recompile it. [Stefan R: changed description from "...0" to "...N"] Cc: Dave Hansen Signed-off-by: Lubomir Rintel Signed-off-by: Stefan Richter --- drivers/firewire/ohci.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) (limited to 'drivers/firewire') diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c index 6aa8a86cb83b..036fb3bd5659 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 = N)"); + 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) -- cgit v1.2.3