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Basic change struct dw_edma_desc *desc └─ chunk list └─ burst list To struct dw_edma_desc *desc └─ burst[n] And reduce at least 2 times kzalloc() for each dma descriptor create. I only test eDMA part, not hardware test hdma part. The finial goal is dymatic add DMA request when DMA running. So needn't wait for irq for fetch next round DMA request. This work is neccesary to for dymatic DMA request appending. The post this part first to review and test firstly during working dymatic DMA part. performance is little bit better. Use NVME as EP function Before Rnd read, 4KB, QD=1, 1 job : IOPS=6660, BW=26.0MiB/s (27.3MB/s) Rnd read, 4KB, QD=32, 1 job : IOPS=28.6k, BW=112MiB/s (117MB/s) Rnd read, 4KB, QD=32, 4 jobs: IOPS=33.4k, BW=130MiB/s (137MB/s) Rnd read, 128KB, QD=1, 1 job : IOPS=914, BW=114MiB/s (120MB/s) Rnd read, 128KB, QD=32, 1 job : IOPS=1204, BW=151MiB/s (158MB/s) Rnd read, 128KB, QD=32, 4 jobs: IOPS=1255, BW=157MiB/s (165MB/s) Rnd read, 512KB, QD=1, 1 job : IOPS=248, BW=124MiB/s (131MB/s) Rnd read, 512KB, QD=32, 1 job : IOPS=353, BW=177MiB/s (185MB/s) Rnd read, 512KB, QD=32, 4 jobs: IOPS=388, BW=194MiB/s (204MB/s) Rnd write, 4KB, QD=1, 1 job : IOPS=6241, BW=24.4MiB/s (25.6MB/s) Rnd write, 4KB, QD=32, 1 job : IOPS=24.7k, BW=96.5MiB/s (101MB/s) Rnd write, 4KB, QD=32, 4 jobs: IOPS=26.9k, BW=105MiB/s (110MB/s) Rnd write, 128KB, QD=1, 1 job : IOPS=780, BW=97.5MiB/s (102MB/s) Rnd write, 128KB, QD=32, 1 job : IOPS=987, BW=123MiB/s (129MB/s) Rnd write, 128KB, QD=32, 4 jobs: IOPS=1021, BW=128MiB/s (134MB/s) Seq read, 128KB, QD=1, 1 job : IOPS=1190, BW=149MiB/s (156MB/s) Seq read, 128KB, QD=32, 1 job : IOPS=1400, BW=175MiB/s (184MB/s) Seq read, 512KB, QD=1, 1 job : IOPS=243, BW=122MiB/s (128MB/s) Seq read, 512KB, QD=32, 1 job : IOPS=355, BW=178MiB/s (186MB/s) Seq read, 1MB, QD=32, 1 job : IOPS=191, BW=192MiB/s (201MB/s) Seq write, 128KB, QD=1, 1 job : IOPS=784, BW=98.1MiB/s (103MB/s) Seq write, 128KB, QD=32, 1 job : IOPS=1030, BW=129MiB/s (135MB/s) Seq write, 512KB, QD=1, 1 job : IOPS=216, BW=108MiB/s (114MB/s) Seq write, 512KB, QD=32, 1 job : IOPS=295, BW=148MiB/s (155MB/s) Seq write, 1MB, QD=32, 1 job : IOPS=164, BW=165MiB/s (173MB/s) Rnd rdwr, 4K..1MB, QD=8, 4 jobs: IOPS=250, BW=126MiB/s (132MB/s) IOPS=261, BW=132MiB/s (138MB/s After Rnd read, 4KB, QD=1, 1 job : IOPS=6780, BW=26.5MiB/s (27.8MB/s) Rnd read, 4KB, QD=32, 1 job : IOPS=28.6k, BW=112MiB/s (117MB/s) Rnd read, 4KB, QD=32, 4 jobs: IOPS=33.4k, BW=130MiB/s (137MB/s) Rnd read, 128KB, QD=1, 1 job : IOPS=1188, BW=149MiB/s (156MB/s) Rnd read, 128KB, QD=32, 1 job : IOPS=1440, BW=180MiB/s (189MB/s) Rnd read, 128KB, QD=32, 4 jobs: IOPS=1282, BW=160MiB/s (168MB/s) Rnd read, 512KB, QD=1, 1 job : IOPS=254, BW=127MiB/s (134MB/s) Rnd read, 512KB, QD=32, 1 job : IOPS=354, BW=177MiB/s (186MB/s) Rnd read, 512KB, QD=32, 4 jobs: IOPS=388, BW=194MiB/s (204MB/s) Rnd write, 4KB, QD=1, 1 job : IOPS=6282, BW=24.5MiB/s (25.7MB/s) Rnd write, 4KB, QD=32, 1 job : IOPS=24.9k, BW=97.5MiB/s (102MB/s) Rnd write, 4KB, QD=32, 4 jobs: IOPS=27.4k, BW=107MiB/s (112MB/s) Rnd write, 128KB, QD=1, 1 job : IOPS=1098, BW=137MiB/s (144MB/s) Rnd write, 128KB, QD=32, 1 job : IOPS=1195, BW=149MiB/s (157MB/s) Rnd write, 128KB, QD=32, 4 jobs: IOPS=1120, BW=140MiB/s (147MB/s) Seq read, 128KB, QD=1, 1 job : IOPS=936, BW=117MiB/s (123MB/s) Seq read, 128KB, QD=32, 1 job : IOPS=1218, BW=152MiB/s (160MB/s) Seq read, 512KB, QD=1, 1 job : IOPS=301, BW=151MiB/s (158MB/s) Seq read, 512KB, QD=32, 1 job : IOPS=360, BW=180MiB/s (189MB/s) Seq read, 1MB, QD=32, 1 job : IOPS=193, BW=194MiB/s (203MB/s) Seq write, 128KB, QD=1, 1 job : IOPS=796, BW=99.5MiB/s (104MB/s) Seq write, 128KB, QD=32, 1 job : IOPS=1019, BW=127MiB/s (134MB/s) Seq write, 512KB, QD=1, 1 job : IOPS=213, BW=107MiB/s (112MB/s) Seq write, 512KB, QD=32, 1 job : IOPS=273, BW=137MiB/s (143MB/s) Seq write, 1MB, QD=32, 1 job : IOPS=168, BW=168MiB/s (177MB/s) Rnd rdwr, 4K..1MB, QD=8, 4 jobs: IOPS=255, BW=128MiB/s (134MB/s) IOPS=266, BW=135MiB/s (141MB/s) Signed-off-by: Frank Li --- Changes in v4: - collect Koichiro Den test by tags - use addr in argument when set ll address, found by sashiko - fix iterate burst problem when exceed max link list, found by sashiko - Link to v3: https://patch.msgid.link/20260702-edma_ll-v3-0-877aa463740c@nxp.com Changes in v3: - remove patch dmaengine: dw-edma: Remove ll_max = -1 in dw_edma_channel_setup() - rebase to vnod's dmaengine topic/config_prep_api - Add non-ll-start() callback to handle non-ll mode transfer - Link to v2: https://lore.kernel.org/r/20260109-edma_ll-v2-0-5c0b27b2c664@nxp.com Changes in v2: - use 'eDMA' and 'HDMA' at commit message - remove debug code. - keep 'inline' to avoid build warning - Link to v1: https://lore.kernel.org/r/20251212-edma_ll-v1-0-fc863d9f5ca3@nxp.com --- Frank Li (10): dmaengine: dw-edma: Move control field update of DMA link to the last step dmaengine: dw-edma: Add xfer_sz field to struct dw_edma_chunk dmaengine: dw-edma: Move ll_region from struct dw_edma_chunk to struct dw_edma_chan dmaengine: dw-edma: Pass down dw_edma_chan to reduce one level of indirection dmaengine: dw-edma: Add helper dw_(edma|hdma)_v0_core_ch_enable() dmaengine: dw-edma: Add callbacks to fill link list entries dmaengine: dw-edma: Add non_ll_start() callback dmaengine: dw-edma: Use common dw_edma_core_start() for both eDMA and HDMA dmaengine: dw-edma: Use burst array instead of linked list dmaengine: dw-edma: Remove struct dw_edma_chunk drivers/dma/dw-edma/dw-edma-core.c | 218 ++++++++---------------------- drivers/dma/dw-edma/dw-edma-core.h | 65 ++++++--- drivers/dma/dw-edma/dw-edma-v0-core.c | 240 +++++++++++++++++----------------- drivers/dma/dw-edma/dw-hdma-v0-core.c | 169 ++++++++++++------------ 4 files changed, 304 insertions(+), 388 deletions(-) --- base-commit: c9e9927c6d8346cdf6555a8f97da093980172e4b change-id: 20251211-edma_ll-0904ba089f01 Best regards, -- Frank Li