On Thu, Jul 13, 2023 at 02:13:16PM -0500, Andrew Davis wrote: > This new export type exposes to userspace the SRAM area as a DMA-BUF Heap, > this allows for allocations of DMA-BUFs that can be consumed by various > DMA-BUF supporting devices. What devices exactly? And what userspace tools/programs are going to use this api? > > Signed-off-by: Andrew Davis <afd@xxxxxx> > --- > > Changes from v2: > - Make sram_dma_heap_allocate static (kernel test robot) > - Rebase on v6.5-rc1 > > drivers/misc/Kconfig | 7 + > drivers/misc/Makefile | 1 + > drivers/misc/sram-dma-heap.c | 245 +++++++++++++++++++++++++++++++++++ > drivers/misc/sram.c | 6 + > drivers/misc/sram.h | 16 +++ > 5 files changed, 275 insertions(+) > create mode 100644 drivers/misc/sram-dma-heap.c > > diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig > index 75e427f124b28..ee34dfb61605f 100644 > --- a/drivers/misc/Kconfig > +++ b/drivers/misc/Kconfig > @@ -448,6 +448,13 @@ config SRAM > config SRAM_EXEC > bool > > +config SRAM_DMA_HEAP > + bool "Export on-chip SRAM pools using DMA-Heaps" > + depends on DMABUF_HEAPS && SRAM > + help > + This driver allows the export of on-chip SRAM marked as both pool > + and exportable to userspace using the DMA-Heaps interface. Module name? > config DW_XDATA_PCIE > depends on PCI > tristate "Synopsys DesignWare xData PCIe driver" > diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile > index f2a4d1ff65d46..5e7516bfaa8de 100644 > --- a/drivers/misc/Makefile > +++ b/drivers/misc/Makefile > @@ -47,6 +47,7 @@ obj-$(CONFIG_VMWARE_VMCI) += vmw_vmci/ > obj-$(CONFIG_LATTICE_ECP3_CONFIG) += lattice-ecp3-config.o > obj-$(CONFIG_SRAM) += sram.o > obj-$(CONFIG_SRAM_EXEC) += sram-exec.o > +obj-$(CONFIG_SRAM_DMA_HEAP) += sram-dma-heap.o > obj-$(CONFIG_GENWQE) += genwqe/ > obj-$(CONFIG_ECHO) += echo/ > obj-$(CONFIG_CXL_BASE) += cxl/ > diff --git a/drivers/misc/sram-dma-heap.c b/drivers/misc/sram-dma-heap.c > new file mode 100644 > index 0000000000000..c054c04dff33e > --- /dev/null > +++ b/drivers/misc/sram-dma-heap.c > @@ -0,0 +1,245 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * SRAM DMA-Heap userspace exporter > + * > + * Copyright (C) 2019-2022 Texas Instruments Incorporated - https://www.ti.com/ > + * Andrew Davis <afd@xxxxxx> It's 2023 :( And this needs review from the dma-buf maintainers before I could do anything with it. thanks, greg k-h
