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Subject[PATCH 00/13] dmaengine redux
Date
The dmaengine subsystem collects and advertises dma channels for two classes
of users in the kernel, memory-to-memory offload and traditional
device-to-memory DMA. The original design was driven by the memory-to-memory
case and is starting to show its limitations now that more device-to-memory
DMA users are being planned. The primary difference between the two classes
is that memory-to-memory offload is very amenable to channel sharing and is
tolerant of dynamic channel changes. Compare this to the device-to-memory
case where a channel must be dedicated to a device and may have
platform-specific reasons why it cannot talk to a different device.

This rework allows channels to be targeted to a public (mem-to-mem) pool or be
reserved for an exclusive private (dev-to-mem) allocation. See [PATCH 1/13]
for documentation of the changes. A nice side effect of the rework is:

24 files changed, 679 insertions(+), 1108 deletions(-)

All review welcomed, especially around the dma_slave changes, or performance
impacts of dma_find_channel.

These patches are currently on async_tx.git/upstream, and barring any
brown-paper-bag issues will move to linux-next via async_tx.git/next.

git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx.git upstream

---
Dan Williams (13):
dmaengine: kill enum dma_state_client
dmaengine: remove 'bigref' infrastructure
dmaengine: kill struct dma_client and supporting infrastructure
dmaengine: replace dma_async_client_register with dmaengine_get
atmel-mci: convert to dma_request_channel and down-level dma_slave
dmatest: convert to dma_request_channel
dmaengine: introduce dma_request_channel and private channels
net_dma: convert to dma_find_channel
dmaengine: provide a common 'issue_pending_all' implementation
dmaengine: centralize channel allocation, introduce dma_find_channel
dmaengine: up-level reference counting to the module level
dmaengine: remove dependency on async_tx
async_tx, dmaengine: document channel allocation and api rework
Documentation/crypto/async-tx-api.txt | 135 +++----
Documentation/dmaengine.txt | 1
arch/avr32/include/asm/atmel-mci.h | 6
arch/avr32/mach-at32ap/at32ap700x.c | 15 -
crypto/async_tx/async_tx.c | 350 ------------------
drivers/dma/Kconfig | 2
drivers/dma/dmaengine.c | 637 +++++++++++++++++++++++----------
drivers/dma/dmatest.c | 111 ++----
drivers/dma/dw_dmac.c | 28 -
drivers/dma/fsldma.c | 3
drivers/dma/ioat_dma.c | 5
drivers/dma/iop-adma.c | 11 -
drivers/dma/mv_xor.c | 11 -
drivers/mmc/host/atmel-mci.c | 103 +----
include/linux/async_tx.h | 17 -
include/linux/dmaengine.h | 148 ++------
include/linux/dw_dmac.h | 31 +-
include/linux/netdevice.h | 3
include/net/netdma.h | 11 -
net/core/dev.c | 148 --------
net/ipv4/tcp.c | 5
net/ipv4/tcp_input.c | 2
net/ipv4/tcp_ipv4.c | 2
net/ipv6/tcp_ipv6.c | 2
24 files changed, 679 insertions(+), 1108 deletions(-)
create mode 100644 Documentation/dmaengine.txt
--

Regards,
Dan


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