Re: [Linaro-mm-sig] Re: [PATCH v3] misc: sram: Add DMA-BUF Heap exporting of SRAM areas

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Am 13.07.23 um 21:28 schrieb Greg Kroah-Hartman:
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.

Yeah, agree. Thanks Greg.

It would be nice if you explicitly CC the maintainers for DMA-buf and DMA-buf heaps as well.

Of hand I can only find the version from 2020 in the LKML archives.

Regards,
Christian.


thanks,

greg k-h
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