arch/tile: introduce GXIO IORPC framework for tilegx
The GXIO I/O RPC subsystem handles exporting I/O hardware resources to
Linux and to applications running under Linux.
For instance, memory which is made available for I/O DMA must be mapped
by an I/O TLB; that means that such memory must be locked down by Linux,
so that it is not swapped or otherwise reused, as long as those I/O
TLB entries are active. Similarly, configuring direct hardware access
introduces new validation requirements. If a user application registers
memory, Linux must ensure that the supplied virtual addresses are valid,
and turn them into client physical addresses. Similarly, when Linux then
supplies those client physical addresses to the Tilera hypervisor, it
must in turn validate those before turning them into the real physical
addresses which are required by the hardware.
To the extent that these sorts of activities were required on previous
TILE architecture processors, they were implemented in a device-specific
fashion. This meant that every I/O device had its own Tilera hypervisor
driver, its own Linux driver, and in some cases its own user-level
library support. There was a large amount of more-or-less functionally
identical code in different places, particularly in the different Linux
drivers. For TILE-Gx, this support has been generalized into a common
framework, known as the I/O RPC framework or just IORPC.
The two "gxio" directories (one for headers, one for sources) start
with just a few files in each with this infrastructure commit, but
after adding support for the on-board I/O shims for networking, PCI,
USB, crypto, compression, I2CS, etc., there end up being about 20 files
in each directory.
More information on the IORPC framework is in the <hv/iorpc.h> header,
included in this commit.
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-04 22:39:58 +02:00
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# Support direct access to TILE-Gx hardware from user space, via the
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# gxio library, or from kernel space, via kernel IORPC support.
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config TILE_GXIO
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bool
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depends on TILEGX
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2012-04-04 22:58:27 +02:00
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# Support direct access to the common I/O DMA facility within the
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# TILE-Gx mPIPE and Trio hardware from kernel space.
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config TILE_GXIO_DMA
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bool
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select TILE_GXIO
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2012-04-06 22:38:03 +02:00
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# Support direct access to the TILE-Gx mPIPE hardware from kernel space.
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config TILE_GXIO_MPIPE
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bool
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select TILE_GXIO
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select TILE_GXIO_DMA
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2012-04-07 22:53:03 +02:00
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# Support direct access to the TILE-Gx TRIO hardware from kernel space.
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config TILE_GXIO_TRIO
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bool
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select TILE_GXIO
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select TILE_GXIO_DMA
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2012-05-09 18:25:02 +02:00
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# Support direct access to the TILE-Gx USB hardware from kernel space.
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config TILE_GXIO_USB_HOST
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bool
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select TILE_GXIO
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2013-08-12 20:09:28 +02:00
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# Support direct access to the TILE-Gx UART hardware from kernel space.
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config TILE_GXIO_UART
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bool
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select TILE_GXIO
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