On 10:36-20250728, huaqian.li@xxxxxxxxxxx wrote: > From: Jan Kiszka <jan.kiszka@xxxxxxxxxxx> > > The TI Peripheral Virtualization Unit (PVU) permits to define a limited > set of mappings for DMA requests on the system memory. Unlike with an > IOMMU, there is no fallback to a memory-backed page table, only a fixed > set of register-backed TLBs. Emulating an IOMMU behavior appears to be > the more fragile the more fragmentation of pending requests occur. > > Therefore, this driver does not expose the PVU as an IOMMU. It rather > introduces a simple, static interface to devices that are under > restricted-dma-pool constraints. They can register their pools with the > PVUs, enabling only those pools to work for DMA. As also MSI is issued > as DMA, the PVU already register the related translator region of the > AM654 as valid DMA target. > > This driver is the essential building block for limiting DMA from > untrusted devices to clearly defined memory regions in the absence of a > real IOMMU (SMMU). > > Co-developed-by: Diogo Ivo <diogo.ivo@xxxxxxxxxxx> > Signed-off-by: Diogo Ivo <diogo.ivo@xxxxxxxxxxx> > Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx> > Signed-off-by: Li Hua Qian <huaqian.li@xxxxxxxxxxx> > --- > drivers/soc/ti/Kconfig | 4 + > drivers/soc/ti/Makefile | 1 + > drivers/soc/ti/ti-pvu.c | 500 ++++++++++++++++++++++++++++++++++++++++ > include/linux/ti-pvu.h | 32 +++ > 4 files changed, 537 insertions(+) > create mode 100644 drivers/soc/ti/ti-pvu.c > create mode 100644 include/linux/ti-pvu.h > > diff --git a/drivers/soc/ti/Kconfig b/drivers/soc/ti/Kconfig > index 1a93001c9e36..af7173ad84de 100644 > --- a/drivers/soc/ti/Kconfig > +++ b/drivers/soc/ti/Kconfig > @@ -82,6 +82,10 @@ config TI_PRUSS > processors on various TI SoCs. It's safe to say N here if you're > not interested in the PRU or if you are unsure. > > +config TI_PVU > + bool "TI Peripheral Virtualization Unit driver" tristate please? Prefer to make this as a module. -- Regards, Nishanth Menon Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3 1A34 DDB5 849D 1736 249D https://ti.com/opensource
