- 03 3月, 2013 35 次提交
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由 James Hogan 提交于
Commit cc2383ec ("mm: introduce arch-specific vma flag VM_ARCH_1") merged in v3.7-rc1. The above commit combined several arch-specific vma flags into one, and in the process it changed the VM_GROWSUP definition to depend on specific architectures rather than CONFIG_STACK_GROWSUP. Therefore add an ifdef for CONFIG_METAG to also set VM_GROWSUP. Signed-off-by: NJames Hogan <james.hogan@imgtec.com> Cc: Konstantin Khlebnikov <khlebnikov@openvz.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Mel Gorman <mgorman@suse.de> Cc: Michel Lespinasse <walken@google.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: linux-mm@kvack.org
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由 James Hogan 提交于
Add the remaining metag header files: - byteorder.h, swab.h (byte order and swapping) - barrier.h, cpu.h. hwthread.h, processor.h (hardware thread related) - bug.h, elf.h, gpio.h, linkage.h, resource.h (other) Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
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由 James Hogan 提交于
Add stack unwinding support for metag. Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
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由 James Hogan 提交于
Add optimised library functions for metag. Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
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由 James Hogan 提交于
Add DMA mapping code. Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
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由 James Hogan 提交于
Add SMP support for metag. This allows Linux to take control of multiple hardware threads on a single Meta core, treating them as separate Linux CPUs. Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
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由 James Hogan 提交于
Add basic metag documentation. This includes an outline description of the ABIs (including syscall ABI) and calling conventions, similar to the one in Documentation/frv/. Signed-off-by: NJames Hogan <james.hogan@imgtec.com> Cc: Rob Landley <rob@landley.net> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: linux-doc@vger.kernel.org
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由 James Hogan 提交于
Add header files to implement Meta hardware thread locks (used by some other atomic operations), atomics, spinlocks, and bitops. There are 2 main types of atomic primitives for metag (in addition to IRQs off on UP): - LOCK instructions provide locking between hardware threads. - LNKGET/LNKSET instructions provide load-linked/store-conditional operations allowing for lighter weight atomics on Meta2 LOCK instructions allow for hardware threads to acquire voluntary or exclusive hardware thread locks: - LOCK0 releases exclusive and voluntary lock from the running hardware thread. - LOCK1 acquires the voluntary hardware lock, blocking until it becomes available. - LOCK2 implies LOCK1, and additionally acquires the exclusive hardware lock, blocking all other hardware threads from executing. Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
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由 James Hogan 提交于
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
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由 James Hogan 提交于
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
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由 James Hogan 提交于
Add metag system call and gateway page interfaces. The metag architecture port uses the generic system call numbers from asm-generic/unistd.h, as well as a user gateway page mapped at 0x6ffff000 which contains fast atomic primitives (depending on SMP) and a fast method of accessing TLS data. System calls use the SWITCH instruction with the immediate 0x440001 to signal a system call. Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
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由 James Hogan 提交于
Meta core internal interrupts (from HWSTATMETA and friends) are vectored onto the TR1 core trigger for the current thread. This is demultiplexed in irq-metag.c to individual Linux IRQs for each internal interrupt. External SoC interrupts (from HWSTATEXT and friends) are vectored onto the TR2 core trigger for the current thread. This is demultiplexed in irq-metag-ext.c to individual Linux IRQs for each external SoC interrupt. The external irqchip has devicetree bindings for configuring the number of irq banks and the type of masking available. Signed-off-by: NJames Hogan <james.hogan@imgtec.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Grant Likely <grant.likely@secretlab.ca> Cc: Rob Herring <rob.herring@calxeda.com> Cc: Rob Landley <rob@landley.net> Cc: Dom Cobley <popcornmix@gmail.com> Cc: Simon Arlott <simon@fire.lp0.eu> Cc: Viresh Kumar <viresh.kumar@linaro.org> Cc: Maxime Ripard <maxime.ripard@free-electrons.com> Cc: devicetree-discuss@lists.ozlabs.org Cc: linux-doc@vger.kernel.org
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由 James Hogan 提交于
Add core IRQ handling for metag. The code in irq.c exposes the TBX signal numbers as Linux IRQs. Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
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由 James Hogan 提交于
Add trap code for metag. At the lowest level Meta traps (and return from interrupt instruction - RTI) simply swap the PC and PCX registers and optionally toggle the interrupt status bit (ISTAT). Low level TBX code in tbipcx.S handles the core context save, determine the TBX signal number based on the core trigger that fired (using the TXSTATI status register), and call TBX signal handlers (mostly in traps.c) via a vector table. Signed-off-by: NJames Hogan <james.hogan@imgtec.com> Cc: Al Viro <viro@zeniv.linux.org.uk>
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由 James Hogan 提交于
Add time keeping code for metag. Meta hardware threads have 2 timers. The background timer (TXTIMER) is used as a free-running time base, and the interrupt timer (TXTIMERI) is used for the timer interrupt. Both counters traditionally count at approximately 1MHz. Signed-off-by: NJames Hogan <james.hogan@imgtec.com> Cc: John Stultz <johnstul@us.ibm.com> Cc: Thomas Gleixner <tglx@linutronix.de>
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由 James Hogan 提交于
The ptrace interface for metag provides access to some core register sets using the PTRACE_GETREGSET and PTRACE_SETREGSET operations. The details of the internal context structures is abstracted into user API structures to both ease use and allow flexibility to change the internal context layouts. Copyin and copyout functions for these register sets are exposed to allow signal handling code to use them to copy to and from the signal context. struct user_gp_regs (NT_PRSTATUS) provides access to the core general purpose register context. struct user_cb_regs (NT_METAG_CBUF) provides access to the TXCATCH* registers which contains information abuot a memory fault, unaligned access error or watchpoint. This can be modified to alter the way the fault is replayed on resume ("catch replay"), or to prevent the replay taking place. struct user_rp_state (NT_METAG_RPIPE) provides access to the state of the Meta read pipeline which can be used to hide memory latencies in hand optimised data loops. Extended DSP register state, DSP RAM, and hardware breakpoint registers aren't yet exposed through ptrace. Signed-off-by: NJames Hogan <james.hogan@imgtec.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Denys Vlasenko <vda.linux@googlemail.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Tony Lindgren <tony@atomide.com> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
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由 James Hogan 提交于
Add device tree files to arch/metag. Signed-off-by: NJames Hogan <james.hogan@imgtec.com> Reviewed-by: NVineet Gupta <vgupta@synopsys.com>
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由 James Hogan 提交于
Add signal handling code for metag. Signed-off-by: NJames Hogan <james.hogan@imgtec.com> Cc: Al Viro <viro@zeniv.linux.org.uk>
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由 James Hogan 提交于
Add some TCM support Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
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由 James Hogan 提交于
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
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由 James Hogan 提交于
Add huge TLB support to the metag architecture. Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
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由 James Hogan 提交于
Meta has instructions for accessing: - bytes - GETB (1 byte) - words - GETW (2 bytes) - doublewords - GETD (4 bytes) - longwords - GETL (8 bytes) All accesses must be aligned. Unaligned accesses can be detected and made to fault on Meta2, however it isn't possible to fix up unaligned writes so we don't bother fixing up reads either. This patch adds metag memory handling code including: - I/O memory (io.h, ioremap.c): Actually any virtual memory can be accessed with these helpers. A part of the non-MMUable address space is used for memory mapped I/O. The ioremap() function is implemented one to one for non-MMUable addresses. - User memory (uaccess.h, usercopy.c): User memory is directly accessible from privileged code. - Kernel memory (maccess.c): probe_kernel_write() needs to be overwridden to use the I/O functions when doing a simple aligned write to non-writecombined memory, otherwise the write may be split by the generic version. Note that due to the fact that a portion of the virtual address space is non-MMUable, and therefore always maps directly to the physical address space, metag specific I/O functions are made available (metag_in32, metag_out32 etc). These cast the address argument to a pointer so that they can be used with raw physical addresses. These accessors are only to be used for accessing fixed core Meta architecture registers in the non-MMU region, and not for any SoC/peripheral registers. Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
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由 James Hogan 提交于
Add memory management files for metag. Meta's 32bit virtual address space is split into two halves: - local (0x08000000-0x7fffffff): traditionally local to a hardware thread and incoherent between hardware threads. Each hardware thread has it's own local MMU table. On Meta2 the local space can be globally coherent (GCOn) if the cache partitions coincide. - global (0x88000000-0xffff0000): coherent and traditionally global between hardware threads. On Meta2, each hardware thread has it's own global MMU table. The low 128MiB of each half is non-MMUable and maps directly to the physical address space: - 0x00010000-0x07ffffff: contains Meta core registers and maps SoC bus - 0x80000000-0x87ffffff: contains low latency global core memories Linux usually further splits the local virtual address space like this: - 0x08000000-0x3fffffff: user mappings - 0x40000000-0x7fffffff: kernel mappings Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
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由 James Hogan 提交于
Add cache and TLB handling code for metag, including the required callbacks used by MM switches and DMA operations. Caches can be partitioned between the hardware threads and the global space, however this is usually configured by the bootloader so Linux doesn't make any changes to this configuration. TLBs aren't configurable, so only need consideration to flush them. On Meta1 the L1 cache was VIVT which required a full flush on MM switch. Meta2 has a VIPT L1 cache so it doesn't require the full flush on MM switch. Meta2 can also have a writeback L2 with hardware prefetch which requires some special handling. Support is optional, and the L2 can be detected and initialised by Linux. Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
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由 James Hogan 提交于
Add source files from the Thread Binary Interface (TBI) library which provides useful low level operations and traps/context management. Among other things it handles interrupt/exception/syscall entry (in tbipcx.S). Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
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由 James Hogan 提交于
Add the main header for the Thread Binary Interface (TBI) library which provides useful low level operations and trap/context management. Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
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由 James Hogan 提交于
Add boot code for metag. Due to the multi-threaded nature of Meta it is not uncommon for an RTOS or bare metal application to be started on other hardware threads by the bootloader. Since there is a single MMU switch which affects all threads, the MMU is traditionally configured by the bootloader prior to starting Linux. The bootloader passes a structure to Linux which among other things contains information about memory regions which have been mapped. Linux then assumes control of the local heap memory region. A kernel arguments string pointer or a flattened device tree pointer can be provided in the third argument. Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
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由 James Hogan 提交于
Add the header <asm/metag_mem.h> describing addresses, fields, and bits of various core memory mapped registers in the low non-MMU region. Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
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由 James Hogan 提交于
Add a couple of header files containing core architecture constants. The first (<asm/metag_isa.h>) contains some constants relating to the instruction set, such as values to give to the CACHEW and CACHER instructions. The second (<asm/metag_regs.h>) contains constants for the core register units directly accessible to various instructions, and for the registers, fields, and bits in those units. The main units described are the control unit (CT.*), the trigger unit (TR.*), and the run-time trace unit (TT.*). Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
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由 James Hogan 提交于
Add MAINTAINERS entry for the metag architecture port. Signed-off-by: NJames Hogan <james.hogan@imgtec.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Mauro Carvalho Chehab <mchehab@redhat.com> Cc: Cesar Eduardo Barros <cesarb@cesarb.net> Cc: Joe Perches <joe@perches.com> Cc: "David S. Miller" <davem@davemloft.net>
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由 James Hogan 提交于
Some 32 bit architectures require 64 bit values to be aligned (for example Meta which has 64 bit read/write instructions). These require 8 byte alignment of event data too, so use !CONFIG_HAVE_64BIT_ALIGNED_ACCESS instead of !CONFIG_64BIT || CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS to decide alignment, and align buffer_data_page::data accordingly. Signed-off-by: NJames Hogan <james.hogan@imgtec.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@redhat.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> (previous version subtly different)
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由 James Hogan 提交于
On 64 bit architectures with no efficient unaligned access, padding and explicit alignment must be added in various places to prevent unaligned 64bit accesses (such as taskstats and trace ring buffer). However this also needs to apply to 32 bit architectures with 64 bit accesses requiring alignment such as metag. This is solved by adding a new Kconfig symbol HAVE_64BIT_ALIGNED_ACCESS which defaults to 64BIT && !HAVE_EFFICIENT_UNALIGNED_ACCESS, and can be explicitly selected by METAG and any other relevant architectures. This can be used in various places to determine whether 64bit alignment is required. Signed-off-by: NJames Hogan <james.hogan@imgtec.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Ingo Molnar <mingo@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Eric Paris <eparis@redhat.com> Cc: Will Drewry <wad@chromium.org>
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由 James Hogan 提交于
The commit "binfmt_elf: cleanups" (f670d0ec) removed an ifndef elf_map but this breaks compilation for metag which does define elf_map. This adds the ifndef back in as it was before, but does not affect the other cleanups made by that patch. Signed-off-by: NJames Hogan <james.hogan@imgtec.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Acked-by: NMikael Pettersson <mikpe@it.uu.se>
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由 James Hogan 提交于
Some architectures have symbol prefixes and set CONFIG_SYMBOL_PREFIX, but this wasn't taken into account by the generic cond_syscall. It's easy enough to fix in a generic fashion, so add the symbol prefix to symbol names in cond_syscall when CONFIG_SYMBOL_PREFIX is set. Signed-off-by: NJames Hogan <james.hogan@imgtec.com> Acked-by: NArnd Bergmann <arnd@arndb.de> Acked-by: NMike Frysinger <vapier@gentoo.org>
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由 James Hogan 提交于
Make asm-generic/io.h check CONFIG_VIRT_TO_BUS before defining virt_to_bus() and bus_to_virt(), otherwise it's easy to accidentally have a silently failing incorrect direct mapped definition rather then no definition at all. Signed-off-by: NJames Hogan <james.hogan@imgtec.com> Acked-by: NArnd Bergmann <arnd@arndb.de>
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- 19 2月, 2013 3 次提交
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由 Linus Torvalds 提交于
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git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input由 Linus Torvalds 提交于
Pull input subsystem fixes from Dmitry Torokhov: "Two small driver fixups and a documentation update for managed input devices" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: Input: wacom - fix wacom_set_report retry logic Input: document that unregistering managed devices is not necessary Input: lm8323 - fix checking PWM interrupt status
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由 Linus Torvalds 提交于
Commit c060f943 ("mm: use aligned zone start for pfn_to_bitidx calculation") fixed out calculation of the index into the pageblock bitmap when a !SPARSEMEM zome was not aligned to pageblock_nr_pages. However, the _allocation_ of that bitmap had never taken this alignment requirement into accout, so depending on the exact size and alignment of the zone, the use of that index could then access past the allocation, resulting in some very subtle memory corruption. This was reported (and bisected) by Ingo Molnar: one of his random config builds would hang with certain very specific kernel command line options. In the meantime, commit c060f943 has been marked for stable, so this fix needs to be back-ported to the stable kernels that backported the commit to use the right alignment. Bisected-and-tested-by: NIngo Molnar <mingo@kernel.org> Acked-by: NMel Gorman <mgorman@suse.de> Cc: stable@kernel.org Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 16 2月, 2013 2 次提交
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由 Linus Torvalds 提交于
Merge tag 'stable/for-linus-3.8-rc7-tag-two' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen Pull xen fixes from Konrad Rzeszutek Wilk: "Two fixes: - A simple bug-fix for redundant NULL check. - CVE-2013-0228/XSA-42: x86/xen: don't assume %ds is usable in xen_iret for 32-bit PVOPS and two reverts: - Revert the PVonHVM kexec. The patch introduces a regression with older hypervisor stacks, such as Xen 4.1." * tag 'stable/for-linus-3.8-rc7-tag-two' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen: Revert "xen PVonHVM: use E820_Reserved area for shared_info" Revert "xen/PVonHVM: fix compile warning in init_hvm_pv_info" xen: remove redundant NULL check before unregister_and_remove_pcpu(). x86/xen: don't assume %ds is usable in xen_iret for 32-bit PVOPS.
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由 Mauro Carvalho Chehab 提交于
As reported by Klaus Schmidinger: "In VDR I use an ioctl() call with FE_READ_UNCORRECTED_BLOCKS on a device (using stb0899). After this call I check 'errno' for EOPNOTSUPP to determine whether this device supports this call. This used to work just fine, until a few months ago I noticed that my devices using stb0899 didn't display their signal quality in VDR's OSD any more. After further investigation I found that ioctl(FE_READ_UNCORRECTED_BLOCKS) no longer returns EOPNOTSUPP, but rather ENOTTY. And since I stop getting the signal quality in case any unknown errno value appears, this broke my signal quality query function." While the changes reflect what is there at: http://comments.gmane.org/gmane.linux.kernel/1235728 it does cause regression on userspace. So, revert it to stop the damage. This reverts commit 177ffe50 ("[media] dvb_frontend: return -ENOTTY for unimplement IOCTL"). Reported-by: NKlaus Schmidinger <Klaus.Schmidinger@tvdr.de> Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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