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* Fixed the mix of bufferCount vs. max_segment_count with regards to

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B_BLOCK_DEVICE_MAX_SG_BLOCKS as pointed out by Ingo.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26972 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Axel Dörfler 2008-08-14 14:28:20 +00:00
parent ad12e71861
commit 61b1a536e8
4 changed files with 7 additions and 7 deletions
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2
src/add-ons/kernel/drivers/disk/scsi/scsi_cd/scsi_cd.cpp
View File

@ -817,7 +817,7 @@ cd_set_capacity(cd_driver_info *info, uint64 capacity, uint32 blockSize)
}
// TODO: we need to replace the DMAResource in our IOScheduler
status_t status = info->dma_resource->Init(info->node, blockSize);
status_t status = info->dma_resource->Init(info->node, blockSize, 32);
if (status != B_OK)
panic("initializing DMAResource failed: %s", strerror(status));

2
src/add-ons/kernel/drivers/disk/scsi/scsi_disk/scsi_disk.cpp
View File

@ -363,7 +363,7 @@ das_set_capacity(das_driver_info* info, uint64 capacity, uint32 blockSize)
}
// TODO: we need to replace the DMAResource in our IOScheduler
status_t status = info->dma_resource->Init(info->node, blockSize);
status_t status = info->dma_resource->Init(info->node, blockSize, 32);
if (status != B_OK)
panic("initializing DMAResource failed: %s", strerror(status));

7
src/system/kernel/device_manager/dma_resources.cpp
View File

@ -115,7 +115,7 @@ DMAResource::~DMAResource()
status_t
DMAResource::Init(device_node* node, size_t blockSize)
DMAResource::Init(device_node* node, size_t blockSize, uint32 bufferCount)
{
dma_restrictions restrictions;
memset(&restrictions, 0, sizeof(dma_restrictions));
@ -139,10 +139,9 @@ DMAResource::Init(device_node* node, size_t blockSize)
B_BLOCK_DEVICE_MAX_BLOCKS_ITEM, &value, true) == B_OK)
restrictions.max_transfer_size = value * blockSize;
uint32 bufferCount;
if (gDeviceManagerModule.get_attr_uint32(node,
B_BLOCK_DEVICE_MAX_SG_BLOCKS, &bufferCount, true) != B_OK)
bufferCount = 16;
B_BLOCK_DEVICE_MAX_SG_BLOCKS, &value, true) == B_OK)
restrictions.max_segment_count = value;
return Init(restrictions, blockSize, bufferCount);
}

3
src/system/kernel/device_manager/dma_resources.h
View File

@ -72,7 +72,8 @@ public:
status_t Init(const dma_restrictions& restrictions,
size_t blockSize, uint32 bufferCount);
status_t Init(device_node* node, size_t blockSize);
status_t Init(device_node* node, size_t blockSize,
uint32 bufferCount);
status_t CreateBuffer(DMABuffer** _buffer)
{ return CreateBuffer(0, _buffer); }