On Wed, Oct 4, 2023 at 4:21 PM Jisheng Zhang <jszhang@xxxxxxxxxx> wrote: > > Drew found "CONFIG_DMA_GLOBAL_POOL=y causes ADMA buffer alloc to fail" > the log looks like: > [ 3.741083] mmc0: Unable to allocate ADMA buffers - falling back to standard DMA > > The logic is: generic riscv defconfig selects ARCH_RENESAS then > ARCH_R9A07G043 which selects DMA_GLOBAL_POOL, which assumes all > non-dma-coherent riscv platforms have a dma global pool, this assumption > seems not correct. And I believe DMA_GLOBAL_POOL should not be > selected by ARCH_SOCFAMILIY, instead, only ARCH under some specific > conditions can select it globaly, for example NOMMU ARM and so on, > because it's designed for special cases such as "nommu cases where > non-cacheable memory lives in a fixed place in the physical address > map" as pointed out by Robin. > > Fix the issue by making ARCH_R9A07G043 (riscv version) depend on > NONPORTABLE, thus generic defconfig won't select ARCH_R9A07G043 by > default. And even for random config case, there will be less debug > effort once we see NONPORTABLE is enabled. > > Reported-by: Drew Fustini <dfustini@xxxxxxxxxxxx> > Closes: https://lore.kernel.org/linux-riscv/ZRuamJuShOnvP1pr@x1/ > Fixes: 484861e09f3e ("soc: renesas: Kconfig: Select the required configs for RZ/Five SoC") > Signed-off-by: Jisheng Zhang <jszhang@xxxxxxxxxx> > --- > drivers/soc/renesas/Kconfig | 1 + > 1 file changed, 1 insertion(+) > Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx> Cheers, Prabhakar > diff --git a/drivers/soc/renesas/Kconfig b/drivers/soc/renesas/Kconfig > index 5a75ab64d1ed..12040ce116a5 100644 > --- a/drivers/soc/renesas/Kconfig > +++ b/drivers/soc/renesas/Kconfig > @@ -333,6 +333,7 @@ if RISCV > > config ARCH_R9A07G043 > bool "RISC-V Platform support for RZ/Five" > + depends on NONPORTABLE > select ARCH_RZG2L > select AX45MP_L2_CACHE if RISCV_DMA_NONCOHERENT > select DMA_GLOBAL_POOL > -- > 2.40.1 >
