[PATCH v6 00/10] dmaengine: dw-edma: flatten desc structions and simplify code
Verma, Devendra
devverma at amd.com
Fri Jul 10 10:28:41 PDT 2026
On 10-Jul-26 22:17, Frank.Li at oss.nxp.com wrote:
> Basic change
>
> struct dw_edma_desc *desc
> └─ chunk list
> └─ burst list
>
> To
>
> struct dw_edma_desc *desc
> └─ burst[n]
>
> Flatten desc structions and simplify code.
>
> I only test eDMA part, not hardware test hdma part.
>
The patch series v5 was tested for non-LL mode for HDMA.
The testing included varying data sizes for transfer and running C2H
(Write) & H2C (Read) for a specified duration on all the 8 Read and 8
Write channels.
non-LL code works fine with this patch series.
For non-LL the changes are similar to v5 in v6.
Tested-By: Devendra Verma <devendra.verma at amd.com>
> 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 <Frank.Li at nxp.com>
> ---
> Changes in v6:
> - use size_t for nburst (sashiko)
> - remove unused field (sashikio)
> - leave pause and resume as it because there are other problem for it. It
> is not fully functional, need fix later.
> - Link to v5: https://patch.msgid.link/20260709-edma_ll-v5-0-e199053d4300@nxp.com
>
> Changes in v5:
> - Fix cover letter typo
> - Fix double subtract found by sashiko AI
> - Link to v4: https://patch.msgid.link/20260708-edma_ll-v4-0-cc128f0afb61@nxp.com
>
> 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 | 220 ++++++++-----------------------
> drivers/dma/dw-edma/dw-edma-core.h | 67 ++++++----
> 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(+), 392 deletions(-)
> ---
> base-commit: c9e9927c6d8346cdf6555a8f97da093980172e4b
> change-id: 20251211-edma_ll-0904ba089f01
>
> Best regards,
> --
> Frank Li <Frank.Li at nxp.com>
>
More information about the Linux-nvme
mailing list