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* rapidio/tsi721_dma: rework scatter-gather list handlingAlexandre Bounine2014-08-081-7/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | Rework Tsi721 RapidIO DMA engine support to allow handling data scatter/gather lists longer than number of hardware buffer descriptors in the DMA channel's descriptor list. The current implementation of Tsi721 DMA transfers requires that number of entries in a scatter/gather list provided by a caller of dmaengine_prep_rio_sg() should not exceed number of allocated hardware buffer descriptors. This patch removes the limitation by processing long scatter/gather lists by sections that can be transferred using hardware descriptor ring of configured size. It also introduces a module parameter "dma_desc_per_channel" to allow run-time configuration of Tsi721 hardware buffer descriptor rings. Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com> Cc: Matt Porter <mporter@kernel.crashing.org> Cc: Andre van Herk <andre.van.herk@prodrive-technologies.com> Cc: Stef van Os <stef.van.os@prodrive-technologies.com> Cc: Vinod Koul <vinod.koul@intel.com> Cc: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* drivers/rapidio/devices/tsi721_dma.c: optimize use of BDMA descriptorsAlexandre Bounine2014-04-071-0/+4
| | | | | | | | | | | | Combine SG entries describing single contiguous memory block into one Tsi721 BDMA descriptor. This reduces number of hardware descriptors required for large data transfers and improves performance on the PCIe side by reducing number of descriptor fetch requests. Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com> Cc: Matt Porter <mporter@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* rapidio/tsi721: fix tasklet termination in dma channel releaseAlexandre Bounine2014-03-041-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch is a modification of the patch originally proposed by Xiaotian Feng <xtfeng@gmail.com>: https://lkml.org/lkml/2012/11/5/413 This new version disables DMA channel interrupts and ensures that the tasklet wil not be scheduled again before calling tasklet_kill(). Unfortunately the updated patch was not released at that time due to planned rework of Tsi721 mport driver to use threaded interrupts (which has yet to happen). Recently the issue was reported again: https://lkml.org/lkml/2014/2/19/762. Description from the original Xiaotian's patch: "Some drivers use tasklet_disable in device remove/release process, tasklet_disable will inc tasklet->count and return. If the tasklet is not handled yet under some softirq pressure, the tasklet will be placed on the tasklet_vec, never have a chance to be excuted. This might lead to a heavy loaded ksoftirqd, wakeup with pending_softirq, but tasklet is disabled. tasklet_kill should be used in this case." This patch is applicable to kernel versions starting from v3.5. Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com> Cc: Matt Porter <mporter@kernel.crashing.org> Cc: Xiaotian Feng <xtfeng@gmail.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Cc: Mike Galbraith <bitbucket@online.de> Cc: <stable@vger.kernel.org> [3.5+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* rapidio: remove use of __devinitBill Pemberton2012-11-281-1/+1
| | | | | | | | | | CONFIG_HOTPLUG is going away as an option so __devinit is no longer needed. Signed-off-by: Bill Pemberton <wfp5p@virginia.edu> Cc: Matt Porter <mporter@kernel.crashing.org> Acked-by: Alexandre Bounine <alexandre.bounine@idt.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* rapidio/tsi721: add inbound memory mapping callbacksAlexandre Bounine2012-10-061-3/+12
| | | | | | | | | | | | Add Tsi721 routines to support RapidIO subsystem's inbound memory mapping interface (RapidIO to system's local memory). Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com> Cc: Matt Porter <mporter@kernel.crashing.org> Cc: Li Yang <leoli@freescale.com> Cc: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* rapidio/tsi721: add DMA engine supportAlexandre Bounine2012-05-311-15/+90
| | | | | | | | | | | | | | | | | | Adds support for DMA Engine API into Tsi721 mport driver. Includes following changes for Tsi721 driver: - Modifies BDMA register offset definitions to support per-channel handling - Separates BDMA channel reserved for RIO Maintenance requests - Adds DMA Engine callback routines Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Vinod Koul <vinod.koul@intel.com> Cc: Li Yang <leoli@freescale.com> Cc: Matt Porter <mporter@kernel.crashing.org> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* rapidio/tsi721: fix bug in register offset definitionsAlexandre Bounine2012-03-151-15/+15
| | | | | | | | | | | | | | | | Fix indexed register offset definitions that use decimal (wrong) instead of hexadecimal (correct) notation for indexing multipliers. Incorrect definitions do not affect Tsi721 driver in its current default configuration because it uses only IDB queue 0. Loss of inbound doorbell functionality should be observed if queue other than 0 is used. Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com> Cc: Matt Porter <mporter@kernel.crashing.org> Cc: Chul Kim <chul.kim@idt.com> Cc: <stable@vger.kernel.org> [3.2+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* rapidio/tsi721: modify PCIe capability settingsAlexandre Bounine2011-12-091-0/+2
| | | | | | | | | | | | | | | Modify initialization of PCIe capability registers in Tsi721 mport driver: - change Completion Timeout value to avoid unexpected data transfer aborts during intensive traffic. - replace hardcoded offset of PCIe capability block by making it use the common function. This patch is applicable to kernel versions starting from 3.2-rc1. Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com> Cc: Matt Porter <mporter@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* RapidIO: add mport driver for Tsi721 bridgeAlexandre Bounine2011-11-021-0/+766
Add RapidIO mport driver for IDT TSI721 PCI Express-to-SRIO bridge device. The driver provides full set of callback functions defined for mport devices in RapidIO subsystem. It also is compatible with current version of RIONET driver (Ethernet over RapidIO messaging services). This patch is applicable to kernel versions starting from 2.6.39. Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com> Signed-off-by: Chul Kim <chul.kim@idt.com> Cc: Kumar Gala <galak@kernel.crashing.org> Cc: Matt Porter <mporter@kernel.crashing.org> Cc: Li Yang <leoli@freescale.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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