From: Laurentiu Tudor <laurentiu.tudor@xxxxxxx> For HCs that have local memory, replace the current DMA API usage with a genalloc generic allocator to manage the mappings for these devices. This is in preparation for dropping the existing "coherent" dma mem declaration APIs. Current implementation was relying on a short circuit in the DMA API that in the end, was acting as an allocator for these type of devices. Only compiled tested, so any volunteers willing to test are most welcome. Thank you! For context, see thread here: https://lkml.org/lkml/2019/4/22/357 Changes in v5: - updated first patch to preserve bisectability (Christoph, Greg) - fixed a few more places where dma api was still being used (e.g. td_alloc, ed_alloc) (Fredrik) - included patch from Fredrik adding gen_pool_dma_zalloc() api - added patch that drops HCD_LOCAL_MEM altogether (Greg) - set td_cache / ed_cache to null for devices with local mem (Fredrik) - introduce usb_hcd_setup_local_mem() that sets up the genalloc pool for drivers and updated drivers to use it Changes in v4: - created mapping for local mem - fix genalloc misuse Changes in v3: - rearranged calls into genalloc simplifying the code a bit (Christoph) - dropped RFC prefix Changes in v2: - use genalloc also in core usb (based on comment from Robin) - moved genpool decl to usb_hcd to be accesible from core usb Fredrik Noring (1): lib/genalloc.c: Add gen_pool_dma_zalloc() for zeroed DMA allocations Laurentiu Tudor (4): USB: use genalloc for USB HCs with local memory usb: host: ohci-sm501: init genalloc for local memory usb: host: ohci-tmio: init genalloc for local memory USB: drop HCD_LOCAL_MEM flag drivers/usb/core/buffer.c | 17 ++++++++---- drivers/usb/core/hcd.c | 51 ++++++++++++++++++++++++++++------ drivers/usb/host/ehci-hcd.c | 2 +- drivers/usb/host/fotg210-hcd.c | 2 +- drivers/usb/host/ohci-hcd.c | 25 +++++++++++++---- drivers/usb/host/ohci-mem.c | 34 ++++++++++++++++++++--- drivers/usb/host/ohci-sm501.c | 50 +++++++++++++++------------------ drivers/usb/host/ohci-tmio.c | 15 ++++------ drivers/usb/host/uhci-hcd.c | 2 +- include/linux/genalloc.h | 1 + include/linux/usb/hcd.h | 6 +++- lib/genalloc.c | 29 ++++++++++++++++++- 12 files changed, 168 insertions(+), 66 deletions(-) -- 2.17.1
