The choice is between looping over the physical range and performing
single cache line operations, or to map highmem pages somewhere, as
cache range ops are possible only on virtual addresses.
Because L2 range ops are much faster, we go with the later by factoring
the physical-to-virtual address conversion and use a fixmap entry for it
in the HIGHMEM case.
Possible future optimizations to avoid the pte setup cost:
- do the pte setup for highmem pages only
- determine a threshold for doing a line-by-line processing on physical
addresses when the range is small
Signed-off-by: Nicolas Pitre <nico@marvell.com>
Same fix as commit c7cf72dcad: when 'start' and 'end' are less than a
cacheline apart and 'start' is unaligned we are done after cleaning and
invalidating the first cacheline.
Cc: <stable@kernel.org>
Signed-off-by: Nicolas Pitre <nico@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
- Make sure that coprocessor instructions for range ops are contiguous
and not reordered.
- s/invalidate_and_disable_dcache/flush_and_disable_dcache/
- Don't re-enable I/D caches if they were not enabled initially.
- Change some masks to shifts for better generated code.
Signed-off-by: Nicolas Pitre <nico@marvell.com>
Acked-by: Lennert Buytenhek <buytenh@marvell.com>
This patch performs the equivalent include directory shuffle for
plat-orion, and fixes up all users.
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
This patch adds support for the unified Feroceon L2 cache controller
as found in e.g. the Marvell Kirkwood and Marvell Discovery Duo
families of ARM SoCs.
Note that:
- Page table walks are outer uncacheable on Kirkwood and Discovery
Duo, since the ARMv5 spec provides no way to indicate outer
cacheability of page table walks (specifying it in TTBR[4:3] is
an ARMv6+ feature).
This requires adding L2 cache clean instructions to
proc-feroceon.S (dcache_clean_area(), set_pte()) as well as to
tlbflush.h ({flush,clean}_pmd_entry()). The latter case is handled
by defining a new TLB type (TLB_FEROCEON) which is almost identical
to the v4wbi one but provides a TLB_L2CLEAN_FR flag.
- The Feroceon L2 cache controller supports L2 range (i.e. 'clean L2
range by MVA' and 'invalidate L2 range by MVA') operations, and this
patch uses those range operations for all Linux outer cache
operations, as they are faster than the regular per-line operations.
L2 range operations are not interruptible on this hardware, which
avoids potential livelock issues, but can be bad for interrupt
latency, so there is a compile-time tunable (MAX_RANGE_SIZE) which
allows you to select the maximum range size to operate on at once.
(Valid range is between one cache line and one 4KiB page, and must
be a multiple of the line size.)
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
