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platform_session: cache arg for alloc_dma_buffer

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This patch extends the 'Platform_session::alloc_dma_buffer' interface
with a 'Cache' argument that corresponds to the argument accepted by
'Ram_allocator::alloc', which is used by the platform driver under the
hood.

Since the x86 platform driver used to be hardwired to allocate DMA
buffers as UNCACHED, I adjusted all drivers by specifying the UNCACHED
argument. Right now, this is needed as a hint for core to steer the
allocation of I/O page tables. Once we eliminate the need for such hints
(by introducing an explicit 'Region_map::attach_dma' operation), we can
revisit the drivers individually because cached DMA buffers should
generally be fine on the x86 architecture.

Issue #2243
This commit is contained in:
Norman Feske
2021-04-08 17:44:11 +02:00
parent 53e44f8bfd
commit 0339318572
21 changed files with 34 additions and 37 deletions
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2
repos/dde_bsd/src/lib/audio/pci.cc
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@ -138,7 +138,7 @@ class Pci_driver : public Bsd::Bus_driver
return Genode::retry<Genode::Out_of_ram>(
[&] () {
return Genode::retry<Genode::Out_of_caps>(
[&] () { return _pci.alloc_dma_buffer(size); },
[&] () { return _pci.alloc_dma_buffer(size, Genode::UNCACHED); },
[&] () { _pci.upgrade_caps(2); });
},
[&] () {