linux-dev/drivers/dma/ioat/registers.h, branch master

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 7

2019-05-21T09:28:40Z

Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details the full gnu general public license is included in this distribution in the file called copying extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 9 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Steve Winslow Reviewed-by: Kate Stewart Reviewed-by: Jilayne Lovejoy Reviewed-by: Allison Randal Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190519154041.244154651@linutronix.de Signed-off-by: Greg Kroah-Hartman

dmaengine: ioatdma: support latency tolerance report (LTR) for v3.4

2019-02-25T06:48:38Z

IOATDMA 3.4 supports PCIe LTR mechanism. The registers are non-standard PCIe LTR support. This needs to be setup in order to not suffer performance impact and provide proper power management. The channel is set to active when it is allocated, and to passive when it's freed. Signed-off-by: Dave Jiang Signed-off-by: Vinod Koul

dmaengine: ioatdma: add descriptor pre-fetch support for v3.4

2019-02-25T06:48:38Z

Adding support for new feature on ioatdma 3.4 hardware that provides descriptor pre-fetching in order to reduce small DMA latencies. Signed-off-by: Dave Jiang Signed-off-by: Vinod Koul

i7300_idle: Remove this driver

2016-11-18T11:07:56Z

In preparation for removing the idle_notifier, remove its only user, the i7300_idle driver. i7300_idle was deployed in 2008 to reduce idle memory power on systems using the i7300 chipset. The driver worked by throttling the fully-buffered DIMMs during idle periods using the IOAT DMA engine. The driver ran only on the i7300 chip-set, and no other hardware has used this mechanism. The driver no longer has a maintainer. Removing this driver will increase idle power on i7300 systems when they run the new kernel without the driver. Signed-off-by: Len Brown Acked-by: Ingo Molnar Acked-by: Peter Zijlstra (Intel) Link: http://lkml.kernel.org/r/ad6a044e57cc75f44cc8621abe846e58f7882243.1479449716.git.len.brown@intel.com Signed-off-by: Thomas Gleixner

dmaengine: ioatdma: Add error handling to ioat driver

2016-08-08T02:41:42Z

Adding error handling to the ioatdma driver so that when a read/write error occurs the error results are reported back and all the remaining descriptors are aborted. This utilizes the new dmaengine callback function that allows reporting of results. Signed-off-by: Dave Jiang Reviewed-by: Lars-Peter Clausen Signed-off-by: Vinod Koul

dmaengine: ioatdma: disable relaxed ordering for ioatdma

2016-05-14T08:06:52Z

ioatdma by default is in snoop mode. Relaxed ordering according to spec does not do anything in snoop mode. However, it causes hang or significant performance degrade when tested with NTB. Disabling in the driver due to some BIOS do not configure it correctly. Signed-off-by: Dave Jiang Signed-off-by: Vinod Koul

dmaengine: IOATDMA: Cleanup pre v3.0 chansts register reads

2015-11-16T03:40:46Z

Remove pre-3.0 channel status reads. 3.0 and later chansts register is 64bit and can be read 64bit. This was clarified with the hardware architects and since the driver now only support 3.0+ we don't need the legacy support Signed-off-by: Dave Jiang Signed-off-by: Vinod Koul

dmaengine: Remove FSF mailing addresses

2015-03-16T16:58:15Z

Free Software Foundation mailing address has been moved in the past and some of the addresses here are outdated. Remove them from file headers since the COPYING file in the kernel sources includes it. Signed-off-by: Jarkko Nikula Signed-off-by: Vinod Koul

ioatdma: Adding write back descriptor error status support for ioatdma 3.3

2013-04-15T17:16:15Z

v3.3 provides support for write back descriptor error status. This allows reporting of errors in a descriptor field. In supporting this, certain errors such as P/Q validation errors no longer halts the channel. The DMA engine can continue to execute until the end of the chain and allow software to report the "errors" up the stack. We are also going to mask those error interrupts and handle them when the "chain" has completed at the end. Signed-off-by: Dave Jiang Acked-by: Dan Williams Signed-off-by: Vinod Koul

ioatdma: Adding support for 16 src PQ ops and super extended descriptors

2013-04-15T17:16:15Z

v3.3 introduced 16 sources PQ operations. This also introduced super extended descriptors to support the 16 srcs operations. This patch adds support for the 16 sources ops and in turn adds the super extended descriptors for those ops. 5 SED pools are created depending on the descriptor sizes. An SED can be a 64 bytes sized descriptor or larger and must be physically contiguous. A kmem cache pool is created for allocating the software descriptor that manages the hardware descriptor. The super extended descriptor will take place of extended descriptor under certain operations and be "attached" to the op descriptor during operation. This is a new feature for ioatdma v3.3. Signed-off-by: Dave Jiang Acked-by: Dan Williams Acked-by: Dan Williams Signed-off-by: Vinod Koul