The following patch adds a call to blk_queue_bounce_limit to the
DAC960 driver. Otherwise, it uses bounce buffering more than it
needs to.
-------------------------------------------------------------------------------
diff -ur linux-2.5.67_original/drivers/block/DAC960.c linux-2.5.67_DACpatch/drivers/block/DAC960.c
--- linux-2.5.67_original/drivers/block/DAC960.c 2003-04-07 10:32:18.000000000 -0700
+++ linux-2.5.67_DACpatch/drivers/block/DAC960.c 2003-04-16 10:56:03.000000000 -0700
@@ -1069,6 +1069,7 @@
if (pci_set_dma_mask(Controller->PCIDevice, DAC690_V1_PciDmaMask))
return DAC960_Failure(Controller, "DMA mask out of range");
+ Controller->BounceBufferLimit = DAC690_V1_PciDmaMask;
if ((hw_type == DAC960_PD_Controller) || (hw_type == DAC960_P_Controller)) {
CommandMailboxesSize = 0;
@@ -1271,6 +1272,7 @@
if (pci_set_dma_mask(Controller->PCIDevice, DAC690_V2_PciDmaMask))
return DAC960_Failure(Controller, "DMA mask out of range");
+ Controller->BounceBufferLimit = DAC690_V2_PciDmaMask;
/* This is a temporary dma mapping, used only in the scope of this function */
CommandMailbox =
@@ -2386,6 +2388,7 @@
*/
RequestQueue = &Controller->RequestQueue;
blk_init_queue(RequestQueue, DAC960_RequestFunction, &Controller->queue_lock);
+ blk_queue_bounce_limit(RequestQueue, Controller->BounceBufferLimit);
RequestQueue->queuedata = Controller;
blk_queue_max_hw_segments(RequestQueue,
Controller->DriverScatterGatherLimit);
diff -ur linux-2.5.67_original/drivers/block/DAC960.h linux-2.5.67_DACpatch/drivers/block/DAC960.h
--- linux-2.5.67_original/drivers/block/DAC960.h 2003-04-07 10:32:18.000000000 -0700
+++ linux-2.5.67_DACpatch/drivers/block/DAC960.h 2003-04-16 10:48:37.000000000 -0700
@@ -62,11 +62,6 @@
/*
Define the pci dma mask supported by DAC960 V1 and V2 Firmware Controlers
-
- For now set the V2 mask to only 32 bits. The controller IS capable
- of doing 64 bit dma. But I have yet to find out whether this needs to
- be explicitely enabled in the controller, or of the controller adapts
- automatically.
*/
#define DAC690_V1_PciDmaMask 0xffffffff
@@ -2370,6 +2365,7 @@
unsigned short ControllerScatterGatherLimit;
unsigned short DriverScatterGatherLimit;
unsigned int ControllerUsageCount;
+ u64 BounceBufferLimit;
unsigned int CombinedStatusBufferLength;
unsigned int InitialStatusLength;
unsigned int CurrentStatusLength;
-
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This archive was generated by hypermail 2b29 : Wed Apr 23 2003 - 22:00:22 EST