kernel/linux.git/drivers/dma/ioat/sysfs.c, branch linux-7.1.y

dmaengine: ioatdma: make sysfs attributes const

2026-03-09T07:28:21+00:00

The ioat_sysfs_entry structures are never modified, mark them as read-only. Signed-off-by: Thomas Weißschuh Acked-by: Dave Jiang Reviewed-by: Frank Li Link: https://patch.msgid.link/20260304-sysfs-const-ioat-v2-4-b9b82651219b@weissschuh.net Signed-off-by: Vinod Koul

dmaengine: ioatdma: make ioat_ktype const

2026-03-09T07:28:21+00:00

ioat_ktype is never modified, so make it const. Signed-off-by: Thomas Weißschuh Acked-by: Dave Jiang Reviewed-by: Frank Li Link: https://patch.msgid.link/20260304-sysfs-const-ioat-v2-3-b9b82651219b@weissschuh.net Signed-off-by: Vinod Koul

dmaengine: ioatdma: move sysfs entry definition out of header

2026-03-09T07:28:21+00:00

Move struct ioat_sysfs_entry into sysfs.c because it is only used in it. Signed-off-by: Thomas Weißschuh Reviewed-by: Frank Li Acked-by: Dave Jiang Link: https://patch.msgid.link/20260304-sysfs-const-ioat-v2-2-b9b82651219b@weissschuh.net Signed-off-by: Vinod Koul

dmaengine: ioatdma: make some sysfs structures static

2026-03-09T07:28:21+00:00

These structures are only used in sysfs.c, where are defined. Make them static and remove them from the header. Signed-off-by: Thomas Weißschuh Reviewed-by: Frank Li Acked-by: Dave Jiang Link: https://patch.msgid.link/20260304-sysfs-const-ioat-v2-1-b9b82651219b@weissschuh.net Signed-off-by: Vinod Koul

dmaengine: ioatdma: use default_groups in kobj_type

2022-01-05T07:41:08+00:00

There are currently 2 ways to create a set of sysfs files for a kobj_type, through the default_attrs field, and the default_groups field. Move the ioatdma sysfs code to use default_groups field which has been the preferred way since aa30f47cf666 ("kobject: Add support for default attribute groups to kobj_type") so that we can soon get rid of the obsolete default_attrs field. Cc: Vinod Koul Cc: dmaengine@vger.kernel.org Signed-off-by: Greg Kroah-Hartman Acked-by: Dave Jiang Link: https://lore.kernel.org/r/20220104163330.1338824-1-gregkh@linuxfoundation.org Signed-off-by: Vinod Koul

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 291

2019-06-05T15:36:38+00:00

Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms and conditions of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope 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 this program is free software you can redistribute it and or modify it under the terms and conditions of the gnu general public license version 2 as published by the free software foundation 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-only has been chosen to replace the boilerplate/reference in 57 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Alexios Zavras Reviewed-by: Allison Randal Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141901.515993066@linutronix.de Signed-off-by: Greg Kroah-Hartman

dmaengine: ioatdma: Add intr_coalesce sysfs entry

2017-08-23T16:02:21+00:00

We observed performance increase with DMA copy from memory to MMIO by changing the interrupt coalescing value to 0. The previous set value was projected on the C5xxx Xeon platform and no longer holds true. Removing hard coded value and providing a tune-able in sysfs in order to allow user to tune this on a per channel basis. By default this value will be set to 0. Example of sysfs variable importing for interrupt coalescing value from command line: echo 5> /sys/devices/pci0000:00/0000:00:04.0/dma/dma0chan0/ quickdata/intr_coalesce Reported-by: Nithin Sujir Signed-off-by: Ujjal Singh Acked-by: Dave Jiang Signed-off-by: Vinod Koul

dmaengine: ioatdma: move all sysfs related code

2015-08-17T08:07:30+00:00

Move and fixup all sysfs related bits to sysfs.c file. Signed-off-by: Dave Jiang Acked-by: Dan Williams Signed-off-by: Vinod Koul