summaryrefslogtreecommitdiff
path: root/Documentation
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2022-04-03 20:31:00 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2022-04-03 20:31:00 +0300
commit63d12cc30574eec9241932cefa17a21df3afd8d0 (patch)
treeb2e02d9586a86b9e94812b8c1936f77a777bf703 /Documentation
parent5dee87215b2c539e7b82704d56f610a4e558b9cc (diff)
parent4fe87e818ea492ade079cc01a31d088e445f8539 (diff)
downloadlinux-63d12cc30574eec9241932cefa17a21df3afd8d0.tar.xz
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.rst14
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.