| Age | Commit message (Collapse) | Author |
|---|
|
Holding a reference to a device does not prevent its driver data from
going away so there is no point in keeping the reference after looking
up the sart device.
Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Neal Gompa <neal@gompa.dev>
Signed-off-by: Sven Peter <sven@kernel.org>
|
|
Add support for SARTv0 as found on Apple A11 SoC.
Reviewed-by: Sven Peter <sven@kernel.org>
Signed-off-by: Nick Chan <towinchenmi@gmail.com>
Link: https://lore.kernel.org/r/20250821-t8015-nvme-v3-5-14a4178adf68@gmail.com
Signed-off-by: Sven Peter <sven@kernel.org>
|
|
SART versions that uses different allow flags will be added.
Reviewed-by: Sven Peter <sven@kernel.org>
Signed-off-by: Nick Chan <towinchenmi@gmail.com>
Link: https://lore.kernel.org/r/20250821-t8015-nvme-v3-4-14a4178adf68@gmail.com
Signed-off-by: Sven Peter <sven@kernel.org>
|
|
Fixes: b170143ae111 ("soc: apple: Add SART driver")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Sven Peter <sven@svenpeter.dev>
Signed-off-by: Hector Martin <marcan@marcan.st>
|
|
The NVMe co-processor on the Apple M1 uses a DMA address filter called
SART for some DMA transactions. This adds a simple driver used to
configure the memory regions from which DMA transactions are allowed.
Unlike a real IOMMU, SART does not support any pagetables and can't be
implemented inside the IOMMU subsystem using iommu_ops.
It also can't be implemented using dma_map_ops since not all DMA
transactions of the NVMe controller are filtered by SART.
Instead, most buffers have to be registered using the integrated NVMe
IOMMU and we can't have two separate dma_map_ops implementations for a
single device.
Co-developed-by: Hector Martin <marcan@marcan.st>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Hector Martin <marcan@marcan.st>
Signed-off-by: Sven Peter <sven@svenpeter.dev>
|
