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786115655f
linux/drivers/spi
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Mark Brown 786115655f
spi: add support for pre-cooking messages 
Merge series from David Lechner <dlechner@baylibre.com>:

This is a follow-up to [1] where it was suggested to break down the
proposed SPI offload support into smaller series.

This takes on the first suggested task of introducing an API to
"pre-cook" SPI messages. This idea was first discussed extensively in
2013 [2][3] and revisited more briefly 2022 [4].

The goal here is to be able to improve performance (higher throughput,
and reduced CPU usage) by allowing peripheral drivers that use the
same struct spi_message repeatedly to "pre-cook" the message once to
avoid repeating the same validation, and possibly other operations each
time the message is sent.

This series includes __spi_validate() and the automatic splitting of
xfers in the optimizations. Another frequently suggested optimization
is doing DMA mapping only once. This is not included in this series, but
can be added later (preferably by someone with a real use case for it).

To show how this all works and get some real-world measurements, this
series includes the core changes, optimization of a SPI controller
driver, and optimization of an ADC driver. This test case was only able
to take advantage of the single validation optimization, since it didn't
require splitting transfers. With these changes, CPU usage of the
threaded interrupt handler, which calls spi_sync(), was reduced from
83% to 73% while at the same time the sample rate (frequency of SPI
xfers) was increased from 20kHz to 25kHz.

[1]: https://lore.kernel.org/linux-spi/20240109-axi-spi-engine-series-3-v1-1-e42c6a986580@baylibre.com/T/
[2]: https://lore.kernel.org/linux-spi/E81F4810-48DD-41EE-B110-D0D848B8A510@martin.sperl.org/T/
[3]: https://lore.kernel.org/linux-spi/39DEC004-10A1-47EF-9D77-276188D2580C@martin.sperl.org/T/
[4]: https://lore.kernel.org/linux-spi/20220525163946.48ea40c9@erd992/T/
2024-02-26 17:54:12 +00:00
..
atmel-quadspi.c spi: Unify error codes by replacing -ENOTSUPP with -EOPNOTSUPP 2023-11-30 12:12:39 +00:00
internals.h
Kconfig spi: Kconfig: cap[c]ability 2024-01-29 16:17:32 +00:00
Makefile spi: Add support for Intel LJCA USB SPI driver 2023-10-11 11:33:38 +02:00
spi-altera-core.c spi: Replace all spi->chip_select and spi->cs_gpiod references with function call 2023-03-11 12:34:01 +00:00
spi-altera-dfl.c spi: spi-altera-dfl: switch to use modern name 2022-12-29 13:22:04 +00:00
spi-altera-platform.c spi: spi-altera-platform: switch to use modern name 2022-12-29 13:22:05 +00:00
spi-amd.c spi: amd: fix Wvoid-pointer-to-enum-cast warning 2023-08-14 13:11:15 +01:00
spi-amlogic-spifc-a1.c spi: amlogic-spifc-a1: switch to use devm_spi_alloc_host() 2023-08-14 13:10:48 +01:00
spi-ar934x.c spi: ar934x: Use helper function devm_clk_get_enabled() 2023-09-11 01:31:52 +01:00
spi-armada-3700.c spi: armada-3700: Use helper function devm_clk_get_prepared() 2023-09-11 01:31:53 +01:00
spi-aspeed-smc.c spi: aspeed: Use helper function devm_clk_get_enabled() 2023-09-11 01:31:54 +01:00
spi-at91-usart.c spi: at91-usart: Remove some dead code 2023-09-25 16:27:48 +02:00
spi-ath79.c spi: bitbang: Follow renaming of SPI "master" to "controller" 2024-02-08 11:54:48 +00:00
spi-atmel.c spi: atmel: Fix clock issue when using devices with different polarities 2023-12-14 10:56:37 +00:00
spi-au1550.c spi: bitbang: Follow renaming of SPI "master" to "controller" 2024-02-08 11:54:48 +00:00
spi-axi-spi-engine.c spi: axi-spi-engine: move message compile to optimize_message 2024-02-26 13:55:12 +00:00
spi-bcm63xx-hsspi.c spi: bcm63xx-hsspi: switch to use modern name 2023-08-07 14:38:23 +01:00
spi-bcm63xx.c spi: bcm63xx: switch to use modern name 2023-08-07 14:38:24 +01:00
spi-bcm2835.c spi: bcm2835: implement ctlr->max_transfer_size 2024-02-05 14:35:44 +00:00
spi-bcm2835aux.c spi: bcm2835aux: Use helper function devm_clk_get_enabled() 2023-09-11 01:31:57 +01:00
spi-bcm-qspi.c spi: bcm-qspi: fix SFDP BFPT read by usig mspi read 2024-01-23 13:28:03 +00:00
spi-bcm-qspi.h spi: bcm-qspi: Make bcm_qspi_remove() return void 2022-10-18 19:16:53 +01:00
spi-bcmbca-hsspi.c spi: bcmbca-hsspi: switch to use modern name 2023-08-14 13:10:59 +01:00
spi-bitbang-txrx.h spi: Get rid of old SPI_MASTER_NO_TX & SPI_MASTER_NO_RX 2023-07-11 13:41:20 +01:00
spi-bitbang.c spi: bitbang: Follow renaming of SPI "master" to "controller" 2024-02-08 11:54:48 +00:00
spi-brcmstb-qspi.c spi: brcmstb-qspi: Convert to platform remove callback returning void 2023-03-06 12:31:15 +00:00
spi-butterfly.c spi: bitbang: Follow renaming of SPI "master" to "controller" 2024-02-08 11:54:48 +00:00
spi-cadence-quadspi.c spi: cadence-qspi: report correct number of chip-select 2024-02-21 16:27:20 +00:00
spi-cadence-xspi.c spi: cadence-xspi: Drop useless assignment to NULL 2023-11-13 01:26:38 +00:00
spi-cadence.c spi: spi-cadence: Reverse the order of interleaved write and read operations 2024-01-23 13:28:05 +00:00
spi-cavium-octeon.c spi: octeon: switch to use modern name 2023-08-07 14:38:29 +01:00
spi-cavium-thunderx.c spi: spi-cavium-thunderx: Use helper function devm_clk_get_enabled() 2023-09-11 01:31:59 +01:00
spi-cavium.c spi: cavium: Follow renaming of SPI "master" to "controller" 2024-02-08 11:54:50 +00:00
spi-cavium.h spi: cavium: Follow renaming of SPI "master" to "controller" 2024-02-08 11:54:50 +00:00
spi-clps711x.c spi: clps711x: switch to use modern name 2023-08-07 14:38:28 +01:00
spi-coldfire-qspi.c spi: coldfire-qspi: Remove an erroneous clk_disable_unprepare() from the remove function 2024-01-05 15:43:54 +00:00
spi-cs42l43.c spi: cs42l43: Clean up of firmware node 2024-02-02 13:14:00 +00:00
spi-davinci.c spi: bitbang: Follow renaming of SPI "master" to "controller" 2024-02-08 11:54:48 +00:00
spi-dln2.c spi: dln2: switch to use modern name 2023-08-07 14:38:32 +01:00
spi-dw-bt1.c spi: dw-bt1: Use helper function devm_clk_get_enabled() 2023-09-11 01:32:01 +01:00
spi-dw-core.c spi: dw: switch to use modern name 2023-08-07 14:38:33 +01:00
spi-dw-dma.c spi: dw: remove redundant assignment to variable len 2024-02-15 14:17:19 +00:00
spi-dw-mmio.c spi: dw: Remove Intel Thunder Bay SOC support 2023-12-13 13:39:55 +00:00
spi-dw-pci.c
spi-dw.h spi: dw: switch to use modern name 2023-08-07 14:38:33 +01:00
spi-ep93xx.c spi: ep93xx: switch to use modern name 2023-08-14 13:10:50 +01:00
spi-falcon.c spi: falcon: switch to use modern name 2023-08-14 13:10:51 +01:00
spi-fsi.c spi: fsi: switch to use spi_alloc_host() 2023-08-14 13:10:52 +01:00
spi-fsl-cpm.c spi: fsl-cpm: Properly define and use IO pointers 2023-08-09 12:52:49 +01:00
spi-fsl-cpm.h
spi-fsl-dspi.c spi: fsl-dspi: Unify error messaging in dspi_request_dma() 2024-02-05 14:35:39 +00:00
spi-fsl-espi.c spi: fsl-espi: switch to use modern name 2023-08-14 13:10:54 +01:00
spi-fsl-lib.c spi: fsl-lib: Follow renaming of SPI "master" to "controller" 2024-02-08 11:54:59 +00:00
spi-fsl-lib.h spi: fsl: Remove unused extern declarations 2023-07-25 17:40:28 +01:00
spi-fsl-lpspi.c spi: fsl-lpspi: switch to use modern name 2023-08-14 13:10:54 +01:00
spi-fsl-qspi.c spi: fsl-qspi: switch to use modern name 2023-08-14 13:10:55 +01:00
spi-fsl-spi.c spi: fsl-spi: switch to use modern name 2023-08-14 13:10:56 +01:00
spi-fsl-spi.h
spi-geni-qcom.c spi: geni-qcom: Follow renaming of SPI "master" to "controller" 2024-02-08 11:54:51 +00:00
spi-gpio.c spi: bitbang: Follow renaming of SPI "master" to "controller" 2024-02-08 11:54:48 +00:00
spi-gxp.c spi: spi-gxp: BUG: Correct spi write return value 2023-09-27 17:06:36 +02:00
spi-hisi-kunpeng.c spi: hisi-kunpeng: switch to use modern name 2023-08-07 14:38:34 +01:00
spi-hisi-sfc-v3xx.c spi: hisi-sfc-v3xx: Return IRQ_NONE if no interrupts were detected 2024-01-23 15:05:18 +00:00
spi-img-spfi.c spi: img-spfi: switch to use modern name 2023-08-14 13:11:01 +01:00
spi-imx.c spi: spi-imx: Use dev_err_probe for failed DMA channel requests 2024-01-23 13:28:04 +00:00
spi-ingenic.c spi: ingenic: convert not to use dma_request_slave_channel() 2023-11-20 13:13:37 +00:00
spi-intel-pci.c spi: intel-pci: Add support for Arrow Lake SPI serial flash 2024-01-22 15:31:29 +00:00
spi-intel-platform.c
spi-intel.c spi: intel: Keep the BIOS partition inside the first chip 2024-02-05 14:35:47 +00:00
spi-intel.h
spi-iproc-qspi.c spi: bcm-qspi: Simplify logic by using devm_platform_ioremap_resource_byname() 2023-08-21 13:10:56 +01:00
spi-jcore.c spi: jcore: switch to use modern name 2023-08-14 13:11:05 +01:00
spi-lantiq-ssc.c spi: lantiq-ssc: Use helper function devm_clk_get_enabled() 2023-09-11 01:32:03 +01:00
spi-ljca.c spi: ljca: switch to use devm_spi_alloc_host() 2023-12-11 12:55:16 +00:00
spi-lm70llp.c spi: bitbang: Follow renaming of SPI "master" to "controller" 2024-02-08 11:54:48 +00:00
spi-loongson-core.c spi: loongson: add bus driver for the loongson spi controller 2023-07-31 15:57:09 +01:00
spi-loongson-pci.c spi: loongson: add bus driver for the loongson spi controller 2023-07-31 15:57:09 +01:00
spi-loongson-plat.c spi: loongson: add bus driver for the loongson spi controller 2023-07-31 15:57:09 +01:00
spi-loongson.h spi: loongson: add bus driver for the loongson spi controller 2023-07-31 15:57:09 +01:00
spi-loopback-test.c spi: loopback-test: Follow renaming of SPI "master" to "controller" 2024-02-08 11:54:52 +00:00
spi-lp8841-rtc.c spi: lp-8841: switch to use modern name 2023-09-11 01:31:31 +01:00
spi-mem.c spi: spi-mem: add statistics support to ->exec_op() calls 2024-02-26 13:55:15 +00:00
spi-meson-spicc.c spi: Use devm_clk_get_*() helper function to 2023-09-11 22:43:17 +01:00
spi-meson-spifc.c spi: Use devm_clk_get_*() helper function to 2023-09-11 22:43:17 +01:00
spi-microchip-core-qspi.c spi: Use devm_clk_get_*() helper function to 2023-09-11 22:43:17 +01:00
spi-microchip-core.c spi: Use devm_clk_get_*() helper function to 2023-09-11 22:43:17 +01:00
spi-mpc52xx-psc.c spi: mpc52xx-psc: Make mpc52xx_psc_spi_transfer_one_message() static 2023-10-06 12:34:31 +01:00
spi-mpc52xx.c spi: mpc52xx: explicitly include linux/platform_device.h 2023-12-08 20:13:24 +00:00
spi-mpc512x-psc.c spi: mpc512x-psc: switch to use modern name 2023-09-11 01:31:35 +01:00
spi-mt65xx.c spi: spi-mt65xx: Support sleep pin control 2024-01-22 00:06:51 +00:00
spi-mt7621.c spi: mt7621: switch to use modern name 2023-09-11 01:31:38 +01:00
spi-mtk-nor.c spi: mtk-nor: switch to use modern name 2023-09-11 01:31:39 +01:00
spi-mtk-snfi.c spi: Use devm_clk_get_*() helper function to 2023-09-11 22:43:17 +01:00
spi-mux.c spi: mux: switch to use spi_alloc_host() 2023-09-11 01:31:41 +01:00
spi-mxic.c spi: mxic: switch to use modern name 2023-09-11 01:31:42 +01:00
spi-mxs.c spi: mxs: switch to use modern name 2023-09-11 01:31:42 +01:00
spi-npcm-fiu.c spi: Unify error codes by replacing -ENOTSUPP with -EOPNOTSUPP 2023-11-30 12:12:39 +00:00
spi-npcm-pspi.c spi: npcm-pspi: switch to use modern name 2023-09-11 01:31:43 +01:00
spi-nxp-fspi.c spi: nxp-fspi: Adjust LUT debug output alignment 2024-01-22 00:06:54 +00:00
spi-oc-tiny.c spi: bitbang: Follow renaming of SPI "master" to "controller" 2024-02-08 11:54:48 +00:00
spi-omap2-mcspi.c spi: omap2-mcspi: Add FIFO support without DMA 2023-10-23 13:30:05 +01:00
spi-omap-uwire.c spi: bitbang: Follow renaming of SPI "master" to "controller" 2024-02-08 11:54:48 +00:00
spi-orion.c spi: orion: Use helper function devm_clk_get_enabled() 2023-09-11 01:32:09 +01:00
spi-pci1xxxx.c spi: mchp-pci1xxxx: release resources on error in probe() 2024-02-13 18:17:39 +00:00
spi-pic32-sqi.c spi: pic32-sqi: Use helper function devm_clk_get_enabled() 2023-09-11 01:32:10 +01:00
spi-pic32.c spi: pic32: Use helper function devm_clk_get_enabled() 2023-09-11 01:32:11 +01:00
spi-pl022.c spi: pl022: update description of internal_cs_control() 2023-12-15 12:58:18 +00:00
spi-ppc4xx.c spi: ppc4xx: switch to use modern name 2023-08-21 14:29:23 +01:00
spi-pxa2xx-dma.c
spi-pxa2xx-pci.c
spi-pxa2xx.c spi: pxa2xx: switch to use modern name 2023-08-21 14:29:24 +01:00
spi-pxa2xx.h
spi-qcom-qspi.c spi: spi-qcom-qspi: switch to use modern name 2023-08-21 14:29:25 +01:00
spi-qup.c spi: qup: Vote for interconnect bandwidth to DRAM 2023-09-25 14:19:38 +02:00
spi-rb4xx.c spi: rb4xx: switch to use modern name 2023-08-21 14:29:27 +01:00
spi-realtek-rtl.c spi: realtek-rtl: switch to use devm_spi_alloc_host() 2023-08-21 14:29:28 +01:00
spi-rockchip-sfc.c spi: rockchip-sfc: switch to use modern name 2023-08-21 14:29:29 +01:00
spi-rockchip.c spi: spi-rockchip: Fix max_native_cs 2024-02-05 14:35:49 +00:00
spi-rpc-if.c spi: rpc-if: switch to use devm_spi_alloc_host() 2023-08-16 12:58:08 +01:00
spi-rspi.c spi: rspi: switch to use spi_alloc_host() 2023-08-21 14:29:30 +01:00
spi-rzv2m-csi.c spi: rzv2m-csi: Add target mode support 2023-10-09 13:14:28 +01:00
spi-s3c64xx.c spi: s3c64xx: straightforward cleanup 2024-02-08 20:26:15 +00:00
spi-sc18is602.c spi: sc18is602: switch to use modern name 2023-08-21 14:29:33 +01:00
spi-sh-hspi.c spi: sh-hspi: switch to use modern name 2023-08-21 14:29:34 +01:00
spi-sh-msiof.c spi: sh-msiof: avoid integer overflow in constants 2024-01-30 15:27:21 +00:00
spi-sh-sci.c spi: bitbang: Follow renaming of SPI "master" to "controller" 2024-02-08 11:54:48 +00:00
spi-sh.c spi: sh: switch to use modern name 2023-08-21 14:29:37 +01:00
spi-sifive.c spi: sifive: switch to use modern name 2023-08-21 14:29:38 +01:00
spi-slave-mt27xx.c spi: slave-mt27xx: Follow renaming of SPI "master" to "controller" 2024-02-08 11:54:53 +00:00
spi-slave-system-control.c
spi-slave-time.c
spi-sn-f-ospi.c spi: spi-sn-f-ospi: switch to use modern name 2023-08-21 14:29:39 +01:00
spi-sprd-adi.c spi: sprd-adi: switch to use spi_alloc_host() 2023-12-11 12:54:53 +00:00
spi-sprd.c spi: sprd: switch to use modern name 2023-12-11 12:54:53 +00:00
spi-st-ssc4.c spi: st-ssc4: switch to use modern name 2023-12-11 12:54:54 +00:00
spi-stm32-qspi.c spi: stm32-qspi: switch to use modern name 2023-12-11 12:54:55 +00:00
spi-stm32.c spi: stm32: move splitting transfers to optimize_message 2024-02-26 13:55:11 +00:00
spi-sun4i.c spi: sun4i: switch to use modern name 2023-12-11 12:54:57 +00:00
spi-sun6i.c spi: sun6i: switch to use modern name 2023-12-11 12:54:58 +00:00
spi-sunplus-sp7021.c spi: sunplus-sp7021: switch to use modern name 2023-12-11 12:54:59 +00:00
spi-synquacer.c spi: synquacer: switch to use modern name 2023-12-11 12:55:00 +00:00
spi-tegra20-sflash.c spi: tegra20-sflash: switch to use modern name 2023-12-11 12:55:03 +00:00
spi-tegra20-slink.c spi: tegra20-slink: switch to use modern name 2023-12-11 12:55:04 +00:00
spi-tegra114.c spi: tegra114: switch to use modern name 2023-12-11 12:55:02 +00:00
spi-tegra210-quad.c spi: tegra210-quad: switch to use modern name 2023-12-11 12:55:05 +00:00
spi-test.h
spi-ti-qspi.c spi: spi-ti-qspi: switch to use modern name 2023-12-11 12:55:06 +00:00
spi-tle62x0.c
spi-topcliff-pch.c spi: topcliff-pch: switch to use modern name 2023-12-11 12:55:07 +00:00
spi-uniphier.c spi: uniphier: switch to use modern name 2023-12-11 12:55:08 +00:00
spi-wpcm-fiu.c spi: wpcm-fiu: switch to use devm_spi_alloc_host() 2023-12-11 12:55:06 +00:00
spi-xcomm.c spi: xcomm: switch to use modern name 2023-12-11 12:55:09 +00:00
spi-xilinx.c spi: bitbang: Follow renaming of SPI "master" to "controller" 2024-02-08 11:54:48 +00:00
spi-xlp.c spi: xlp: switch to use modern name 2023-12-11 12:55:11 +00:00
spi-xtensa-xtfpga.c spi: bitbang: Follow renaming of SPI "master" to "controller" 2024-02-08 11:54:48 +00:00
spi-zynq-qspi.c spi: zynq-qspi: switch to use modern name 2023-12-11 12:55:13 +00:00
spi-zynqmp-gqspi.c spi: zynqmp-gqspi: switch to use modern name 2023-12-11 12:55:14 +00:00
spi.c spi: move splitting transfers to spi_optimize_message() 2024-02-26 13:55:11 +00:00
spidev.c spi: spidev: Follow renaming of SPI "master" to "controller" 2024-02-08 11:54:53 +00:00