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| author |   Laurentiu Tudor <laurentiu.tudor@nxp.com> | 2019-05-29 13:28:40 +0300 |
|---|---|---|
| committer |   Christoph Hellwig <hch@lst.de> | 2019-06-03 16:00:07 +0200 |
| commit | b0310c2f09bbe8aebefb97ed67949a3a7092aca6 (patch) | |
| tree | a0c1be9e4cf413c4bafcd77e95a84830e0f21dcd /drivers/usb/host/ohci.h | |
| parent | lib/genalloc: add gen_pool_dma_zalloc() for zeroed DMA allocations (diff) | |
| download | wireguard-linux-b0310c2f09bbe8aebefb97ed67949a3a7092aca6.tar.xz wireguard-linux-b0310c2f09bbe8aebefb97ed67949a3a7092aca6.zip | |
USB: use genalloc for USB HCs with local memory
For HCs that have local memory, replace the current DMA API usage with
a genalloc generic allocator to manage the mappings for these devices.
To help users, introduce a new HCD API, usb_hcd_setup_local_mem() that
will setup up the genalloc backing up the device local memory. It will
be used in subsequent patches. This is in preparation for dropping
the existing "coherent" dma mem declaration APIs. The 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.
Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Tested-by: Fredrik Noring <noring@nocrew.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/usb/host/ohci.h')
| -rw-r--r-- | drivers/usb/host/ohci.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/usb/host/ohci.h b/drivers/usb/host/ohci.h index ef4813bfc5bf..b015b00774b2 100644 --- a/drivers/usb/host/ohci.h +++ b/drivers/usb/host/ohci.h @@ -385,6 +385,8 @@ struct ohci_hcd { /* * memory management for queue data structures + * + * @td_cache and @ed_cache are %NULL if &usb_hcd.localmem_pool is used. */ struct dma_pool *td_cache; struct dma_pool *ed_cache; |