linux/arch/tile/kernel/setup.c, branch v3.13

tile: remove HUGE_VMAP dead code

2013-09-13T15:15:24Z

A config option to allow a variant vmap() using huge pages that was never upstreamed had some bits of code related to it scattered around the tile architecture; the config option was removed downstream and this commit cleans up the scattered evidence of it from the upstream as well. Signed-off-by: Chris Metcalf

Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile

2013-09-06T18:14:33Z

Pull Tile arch updates from Chris Metcalf: "These changes bring in a bunch of new functionality that has been maintained internally at Tilera over the last year, plus other stray bits of work that I've taken into the tile tree from other folks. The changes include some PCI root complex work, interrupt-driven console support, support for performing fast-path unaligned data fixups by kernel-based JIT code generation, CONFIG_PREEMPT support, vDSO support for gettimeofday(), a serial driver for the tilegx on-chip UART, KGDB support, more optimized string routines, support for ftrace and kprobes, improved ASLR, and many bug fixes. We also remove support for the old TILE64 chip, which is no longer buildable" * git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile: (85 commits) tile: refresh tile defconfig files tile: rework tile PCI RC: make default consistent DMA mask 32-bit tile: add null check for kzalloc in tile/kernel/setup.c tile: make __write_once a synonym for __read_mostly tile: remove support for TILE64 tile: use asm-generic/bitops/builtin-*.h tile: eliminate no-op "noatomichash" boot argument tile: use standard tile_bundle_bits type in traps.c tile: simplify code referencing hypervisor API addresses tile: change to in comments tile: mark pcibios_init() as __init tile: check for correct compiler earlier in asm-offsets.c tile: use standard 'generic-y' model for tile: use asm-generic version of tile PCI RC: add comment about "PCI hole" problem tile: remove DEBUG_EXTRA_FLAGS kernel config option tile: add virt_to_kpte() API and clean up and document behavior tile: support FRAME_POINTER tile: support reporting Tilera hypervisor statistics ...

tile: add null check for kzalloc in tile/kernel/setup.c

2013-09-03T18:53:34Z

Should check the return value of kzalloc first to avoid the null pointer. Then can dereference the non-null pointer to access the fields of struct resource. Signed-off-by: Wang Sheng-Hui Signed-off-by: Chris Metcalf

tile: remove support for TILE64

2013-09-03T18:53:29Z

This chip is no longer being actively developed for (it was superceded by the TILEPro64 in 2008), and in any case the existing compiler and toolchain in the community do not support it. It's unlikely that the kernel works with TILE64 at this point as the configuration has not been tested in years. The support is also awkward as it requires maintaining a significant number of ifdefs. So, just remove it altogether. Signed-off-by: Chris Metcalf

tile: add virt_to_kpte() API and clean up and document behavior

2013-09-03T18:52:13Z

We use virt_to_pte(NULL, va) a lot, which isn't very obvious. I added virt_to_kpte(va) as a more obvious wrapper function, that also validates the va as being a kernel adddress. And, I fixed the semantics of virt_to_pte() so that we handle the pud and pmd the same way, and we now document the fact that we handle the final pte level differently. Signed-off-by: Chris Metcalf

tile: parameterize VA and PA space more cleanly

2013-09-03T18:47:34Z

The existing code relied on the hardware definition () to specify how much VA and PA space was available. It's convenient to allow customizing this for some configurations, so provide symbols MAX_PA_WIDTH and MAX_VA_WIDTH in that can be modified if desired. Additionally, move away from the MEM_XX_INTRPT nomenclature to define the start of various regions within the VA space. In fact the cleaner symbol is, for example, MEM_SV_START, to indicate the start of the area used for supervisor code; the actual address of the interrupt vectors is not as important, and can be changed if desired. As part of this change, convert from "intrpt1" nomenclature (which built in the old privilege-level 1 model) to a simple "intrpt". Also strip out some tilepro-specific code supporting modifying the PL the kernel could run at, since we don't actually support using different PLs in tilepro, only tilegx. Signed-off-by: Chris Metcalf

tile: allow "initrd" boot argument for kexec

2013-08-30T15:56:30Z

This enables support for "kexec --initrd" for tile. Signed-off-by: Chris Metcalf

tile: support "memmap" boot parameter

2013-08-12T18:46:43Z

This change adds support for the "memmap" boot parameter similar to what x86 provides. The tile version supports "memmap=1G$5G", for example, as a way to reserve a 1 GB range starting at PA 5GB. The memory is reserved via bootmem during startup, and we create a suitable "struct resource" marked as "Reserved" so you can see the range reported by /proc/iomem. Up to 64 such regions can currently be reserved on the boot command line. We do not support the x86 options "memmap=nn@ss" (force some memory to be available at the given address) since it's pointless to try to have Linux use memory the Tilera hypervisor hasn't given it. We do not support "memmap=nn#ss" to add an ACPI range for later processing, since we don't support ACPI. We do not support "memmap=exactmap" since we don't support reading the e820 information from the BIOS like x86 does. I did add support for "memmap=nn" (and the synonym "mem=nn") which cap the highest PA value at "nn"; these are both just a synonym for the existing tile boot option "maxmem". Signed-off-by: Chris Metcalf

tile PCI RC: tilepro conflict with PCI and RAM addresses

2013-08-05T20:12:51Z

Fix a bug in the tilepro PCI resource allocation code that could make the bootmem allocator unhappy if 4GB is installed on mshim 0. Signed-off-by: Chris Metcalf

tile: delete __cpuinit usage from all tile files

2013-07-14T23:36:54Z

The __cpuinit type of throwaway sections might have made sense some time ago when RAM was more constrained, but now the savings do not offset the cost and complications. For example, the fix in commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time") is a good example of the nasty type of bugs that can be created with improper use of the various __init prefixes. After a discussion on LKML[1] it was decided that cpuinit should go the way of devinit and be phased out. Once all the users are gone, we can then finally remove the macros themselves from linux/init.h. Note that some harmless section mismatch warnings may result, since notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c) are flagged as __cpuinit -- so if we remove the __cpuinit from arch specific callers, we will also get section mismatch warnings. As an intermediate step, we intend to turn the linux/init.h cpuinit content into no-ops as early as possible, since that will get rid of these warnings. In any case, they are temporary and harmless. This removes all the arch/tile uses of the __cpuinit macros from all C files. Currently tile does not have any __CPUINIT used in assembly files. [1] https://lkml.org/lkml/2013/5/20/589 Cc: Chris Metcalf Signed-off-by: Paul Gortmaker