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author | Linus Torvalds <torvalds@linux-foundation.org> | 2022-04-03 19:31:00 +0200 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-04-03 19:31:00 +0200 |
commit | 63d12cc30574eec9241932cefa17a21df3afd8d0 (patch) | |
tree | b2e02d9586a86b9e94812b8c1936f77a777bf703 /Documentation | |
parent | Merge tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm (diff) | |
parent | dma-mapping: move pgprot_decrypted out of dma_pgprot (diff) | |
download | linux-63d12cc30574eec9241932cefa17a21df3afd8d0.tar.xz linux-63d12cc30574eec9241932cefa17a21df3afd8d0.zip |
Merge tag 'dma-mapping-5.18-1' of git://git.infradead.org/users/hch/dma-mapping
Pull more dma-mapping updates from Christoph Hellwig:
- fix a regression in dma remap handling vs AMD memory encryption (me)
- finally kill off the legacy PCI DMA API (Christophe JAILLET)
* tag 'dma-mapping-5.18-1' of git://git.infradead.org/users/hch/dma-mapping:
dma-mapping: move pgprot_decrypted out of dma_pgprot
PCI/doc: cleanup references to the legacy PCI DMA API
PCI: Remove the deprecated "pci-dma-compat.h" API
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/PCI/pci.rst | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/Documentation/PCI/pci.rst b/Documentation/PCI/pci.rst index 87c6f4a6ca32..67a850b55617 100644 --- a/Documentation/PCI/pci.rst +++ b/Documentation/PCI/pci.rst @@ -278,20 +278,20 @@ appropriate parameters. In general this allows more efficient DMA on systems where System RAM exists above 4G _physical_ address. Drivers for all PCI-X and PCIe compliant devices must call -pci_set_dma_mask() as they are 64-bit DMA devices. +set_dma_mask() as they are 64-bit DMA devices. Similarly, drivers must also "register" this capability if the device -can directly address "consistent memory" in System RAM above 4G physical -address by calling pci_set_consistent_dma_mask(). +can directly address "coherent memory" in System RAM above 4G physical +address by calling dma_set_coherent_mask(). Again, this includes drivers for all PCI-X and PCIe compliant devices. Many 64-bit "PCI" devices (before PCI-X) and some PCI-X devices are 64-bit DMA capable for payload ("streaming") data but not control -("consistent") data. +("coherent") data. Setup shared control data ------------------------- -Once the DMA masks are set, the driver can allocate "consistent" (a.k.a. shared) +Once the DMA masks are set, the driver can allocate "coherent" (a.k.a. shared) memory. See Documentation/core-api/dma-api.rst for a full description of the DMA APIs. This section is just a reminder that it needs to be done before enabling DMA on the device. @@ -367,7 +367,7 @@ steps need to be performed: - Disable the device from generating IRQs - Release the IRQ (free_irq()) - Stop all DMA activity - - Release DMA buffers (both streaming and consistent) + - Release DMA buffers (both streaming and coherent) - Unregister from other subsystems (e.g. scsi or netdev) - Disable device from responding to MMIO/IO Port addresses - Release MMIO/IO Port resource(s) @@ -420,7 +420,7 @@ Once DMA is stopped, clean up streaming DMA first. I.e. unmap data buffers and return buffers to "upstream" owners if there is one. -Then clean up "consistent" buffers which contain the control data. +Then clean up "coherent" buffers which contain the control data. See Documentation/core-api/dma-api.rst for details on unmapping interfaces. |