The patch titled DMA-API.txt: add dma_sync_single/sg API description has been removed from the -mm tree. Its filename was dma-apitxt-add-dma_sync_single-sg-api-description.patch This patch was dropped because it was merged into mainline or a subsystem tree The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: DMA-API.txt: add dma_sync_single/sg API description From: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx> This adds the description of the following eight function: dma_sync_single_for_cpu pci_dma_sync_single_for_cpu dma_sync_single_for_device pci_dma_sync_single_for_device dma_sync_sg_for_cpu pci_dma_sync_sg_for_cpu dma_sync_sg_for_device pci_dma_sync_sg_for_device It was unclear that the API permits a partial sync (some network drivers already do though). I made it clear that the sync_single API can do a partial sync but the sync_sg API can't. We could do a partial sync with the sync_sg API too, however, it's difficult for driver writers to correctly use the sync_sg API for a partial sync since the scatterlists passed in to the mapping API can't be modified. It's unlikely that driver writers want to do a partial sync with the sync_sg API (because the sync_sg API are usually used for block drivers). So I think that it's better to forbid a partial sync with the sync_sg API. Signed-off-by: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx> Acked-by: David Miller <davem@xxxxxxxxxxxxx> Acked-by: James Bottomley <James.Bottomley@xxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- Documentation/DMA-API.txt | 42 ++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff -puN Documentation/DMA-API.txt~dma-apitxt-add-dma_sync_single-sg-api-description Documentation/DMA-API.txt --- a/Documentation/DMA-API.txt~dma-apitxt-add-dma_sync_single-sg-api-description +++ a/Documentation/DMA-API.txt @@ -364,6 +364,48 @@ API. Note: <nents> must be the number you passed in, *not* the number of physical entries returned. +void +dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size, + enum dma_data_direction direction) +void +pci_dma_sync_single_for_cpu(struct pci_dev *hwdev, dma_addr_t dma_handle, + size_t size, int direction) +void +dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size, + enum dma_data_direction direction) +void +pci_dma_sync_single_for_device(struct pci_dev *hwdev, dma_addr_t dma_handle, + size_t size, int direction) +void +dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems, + enum dma_data_direction direction) +void +pci_dma_sync_sg_for_cpu(struct pci_dev *hwdev, struct scatterlist *sg, + int nelems, int direction) +void +dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems, + enum dma_data_direction direction) +void +pci_dma_sync_sg_for_device(struct pci_dev *hwdev, struct scatterlist *sg, + int nelems, int direction) + +Synchronise a single contiguous or scatter/gather mapping for the cpu +and device. With the sync_sg API, all the parameters must be the same +as those passed into the single mapping API. With the sync_single API, +you can use dma_handle and size parameters that aren't identical to +those passed into the single mapping API to do a partial sync. + +Notes: You must do this: + +- Before reading values that have been written by DMA from the device + (use the DMA_FROM_DEVICE direction) +- After writing values that will be written to the device using DMA + (use the DMA_TO_DEVICE) direction +- before *and* after handing memory to the device if the memory is + DMA_BIDIRECTIONAL + +See also dma_map_single(). + dma_addr_t dma_map_single_attrs(struct device *dev, void *cpu_addr, size_t size, enum dma_data_direction dir, _ Patches currently in -mm which might be from fujita.tomonori@xxxxxxxxxxxxx are origin.patch linux-next.patch scsi-add-__init-__exit-macros-to-ibmvstgtc.patch ssb-add-dma_dev-to-ssb_device-structure.patch b43legacy-replace-the-ssb_dma-api-with-the-generic-dma-api.patch b43-replace-the-ssb_dma-api-with-the-generic-dma-api.patch b44-replace-the-ssb_dma-api-with-the-generic-dma-api.patch ssb-remove-the-ssb-dma-api.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html