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Saving some instructions. Clear VMS bit if kernel comes
from kernel space.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Saving instructions by adding 2/3 addik instructions to one.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Saving instruction with delay slot usage.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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This change save one instruction if kernel comes from kernel
space.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Separate reg saving and mode setting.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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SAVE_STATE macro could be used by other rutines too.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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We are not working with values from MSR that's why
we can discard it and use r11 for different purpose without
saving/restoring.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Remove set_vms because UMS is cleared and VMS is already setup.
Optimize function calling which save one additional instruction.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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VMS is always setup because VM mode was before
exception/syscall/interrupt. Kernel continues in kernel mode
that's why we have to clear UMS bit if kernel comes from
user space.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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PT_MODE stores information if kernel comes from user
or kernel space. If come from user space, PT_MODE
contains 0. If come from kernel store, PT_MODE contains
non zero value. We don't need to save value 1. I am using
r1 register which contains non zero value.
This change save one additional instruction.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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SAVE_STATE macro could be used for user_exception
or interrupt functions.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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We don't need to save r0 to PT_R0. It could be additional
operation.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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We don't need to save R11 register. There is easy way
to use only R1 which is saved and restore later.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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BIP is already setup.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Keep together all arguments for send_sig function.
Move returning address to delay slot which is executed.
Remove additional send_sig loading. I am using IMM part of
rtbd instruction with r0.
old solution:
addik r11, r0, send_sig
rtbd r11, 0
nop
new solution:
rtbd r0, send_sig
nop
There is one instruction saving.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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It is necessary to setup BIP and EE and clear EIP
only for unaligned exception handler. The rest of
hw exception handlers don't require it.
HW exception occured and we are not in virtual mode.
That's why we can do operations protected by EIP.
Interrupt, next hw exception or syscall can't occur.
EIP is cleared by rted.
This change speedup page_fault hw exception handler
which is critical path.
There is also necessary to save R11 content before
flag setup for unaligned exception.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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la is translated to addik by toolchain.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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SAVE_STATE macro is used in hw exceptions high level handling
functions. Hw exception doesn't disable IRQ that's why we don't
need to reenable it.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Remove code duplicity and move it to SAVE_STATE macro.
There is no impact on performance.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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We don't need to protect by BIP whole ret_from_trap/ret_from_exc code.
Only restoring from user/hw exception should be covered.
If BIP is setup, IRQ can't occur.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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There is a way howto remove Kernel Mode variable. It is easier
to parse UMS bit in MSR to find out if I come from kernel or user
space. Loading MSR content should be in one cycle and loading
PER_CPU variable depends on memory state.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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We can save two instruction when MSR_VMS and MSR_UMS
are setup in one instruction.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Save and restore R3/R4 registers in macros. This change
help to cleanup entry.S.
In ret_from_trap function we are saving returning value from
syscall to pt_regs on stack that's why we don't need to save and
restore these values before kernel functions (schedule, do_signal).
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Jump behind macro. We don't want to execute nop instruction again.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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_start symbol stores physical address where kernel is.
Gdb uses this symbol for their purpose that's why
we have to rename it.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Remove spaces and use tabs instead.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Microblaze has only 11 pvr regs according manual.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Lower shifting values ensure that shifted 32bit counter
value doesn't exceed 64bit cycle variable too fast.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Microblaze has support for early printk. The second serial
driver (uart16550/8250) has no microblaze support for early
printk.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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HAVE_ARCH_PCI_SET_DMA_MASK was removed in 2.6.34 (no architecture has
the own implementation of pci_set_dma_mask).
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Michal Simek <monstr@monstr.eu>
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IRQsoff tracer requires to protect cpu_idle function
to get correct timing report.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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I had to comment sched_clock generic function because of broken toolchain.
It is fine grain timing.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Implement intelligent backtracing by searching for stack frame creation,
and emitting only return addresses. Use print_hex_dump() to display the
entire binary kernel stack.
Limitation: MMU kernels are not currently able to trace beyond a system trap
(interrupt, syscall, etc.). It is the intent of this patch to provide
infrastructure that can be extended to add this capability later.
Changes from V1:
* Removed checks in find_frame_creation() that prevented location of the frame
creation instruction in heavily optimized code
* Various formatting/commenting/file location tweaks per review comments
* Dropped Kconfig option to enable STACKTRACE as something logically separate
Signed-off-by: Steven J. Magnani <steve@digidescorp.com>
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Allow developer to configure memory page size at compile time.
Larger pages can improve performance on some workloads.
Based on PowerPC code.
Signed-off-by: Steven J. Magnani <steve@digidescorp.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Add trace_hardirqs_off and trace_hardirqs_on to do_IRQ function.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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sys_clone syscall ignored args which this patch mapped to args
which are passing from glibc.
Here is the origin problem description.
"I ran the static libgcc tests (very few of them are there, they are
mostly dynamically linked) and some of them fail with an assertion in
fork() system call (tid != pid), I looked at the microblaze/entry.S
file and it looks suspicious (ignores arguments 3-5)"
Arg mapping should be:
glibc ARCH_FORK(...) -> do_fork(...)
r5 -> r5 (clone_flags)
r6 -> r6 (stack_start, use parent->stack if NULL)
pt_regs -> r7 (pt_regs)
r7 -> r8 (stack_size)
r8 -> r9 (parent_tidptr)
r9 -> r10 (child_tidptr)
Signed-off-by: John Williams <john.williams@petalogix.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Microblaze doesn't support frame pointers. Ftrace code
uses CALLER_ADDR1 which is defined in linux/ftrace.h. For Microblaze
is 0.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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copy_to_user_page macro is used in mm/memory.c:access_process_vm
function. This function is called from ptrace code (POKETEXT, POKEDATA)
which write data to memory. Microblaze handle physical address for
caches that's why there is virt_to_phys conversion.
There is potential one location which can caused the problem on WB system.
The important is take a look at write PTRACEs requests
(POKE/TEXT, DATA, USR).
Note:
Majority of Microblaze PTRACE code is moved to generic location
in newer kernel version that's why this solution should work on
the newest kernel version too.
linux/io.h is in cacheflush because of mm/nommu.c
Tested on a WB system - hello world debugging.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Both versions can use the same node to register NODE_DATA(0)
Signed-off-by: Michal Simek <monstr@monstr.eu>
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The label should be remove by
21e1c93631e027136ea4070e7bca600c4ad4f391
Warning message:
arch/microblaze/mm/fault.c: In function 'do_page_fault':
arch/microblaze/mm/fault.c:229: warning: label 'survive' defined but not used
Signed-off-by: Michal Simek <monstr@monstr.eu>
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flush_dcache_page macro is necessary to implement for
JFFS2 rootfs support on WB system.
Signed-off-by: Michal Simek <monstr@monstr.eu>
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Marvell 88ec048 is a derivative of its 88e1121r device. From the programmer's
perspective, the one major difference is the addition of an additional control
bit in Page 2 Register 16 - used to control the padding of odd nibble
preambles.
This patch adds support for this new device, while inheriting as much code as
possible from the existing 88e1121r implementation.
Signed-off-by: Cyril Chemparathy <cyril@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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On non laptop systems we'll see these the whole time, so make them
less important.
Signed-off-by: Dave Airlie <airlied@redhat.com>
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This connector attribute allows you to enable or disable underscan
on a digital output to compensate for panels that automatically
overscan (e.g., many HDMI TVs). Valid values for the attribute are:
off - forces underscan off
on - forces underscan on
auto - enables underscan if an HDMI TV is connected, off otherwise
default value is auto.
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
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Prior to this patch the code was dividing the src_v by the dst_h
and vice versa, rather than src_v/dst_v and src_h/dst_h.
This could lead to problems in the calculation of the display
watermarks.
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
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drm-core-next
* 'intel/drm-intel-next' of /ssd/git/drm-next: (230 commits)
drm/i915: Clear the Ironlake dithering flags when the pipe doesn't want it.
drm/agp/i915: trim stolen space to 32M
drm/i915: Unset cursor if out-of-bounds upon mode change (v4)
drm/i915: Unreference object not handle on creation
drm/i915: Attempt to uncouple object after catastrophic failure in unbind
drm/i915: Repeat unbinding during free if interrupted (v6)
drm/i915: Refactor i915_gem_retire_requests()
drm/i915: Warn if we run out of FIFO space for a mode
drm/i915: Round up the watermark entries (v3)
drm/i915: Typo in (unused) register mask for overlay.
drm/i915: Check overlay stride errata for i830 and i845
drm/i915: Validate the mode for eDP by using fixed panel size
drm/i915: Always use the fixed panel timing for eDP
drm/i915: Enable panel fitting for eDP
drm/i915: Add fixed panel mode parsed from EDID for eDP without fixed mode in VBT
drm/i915/sdvo: Set sync polarity based on actual mode
drm/i915/hdmi: Set sync polarity based on actual mode
drm/i915/pch: Set transcoder sync polarity for DP based on actual mode
drm/i915: Initialize LVDS and eDP outputs before anything else
drm/i915/dp: Correctly report eDP in the core connector type
...
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Intel variants don't support it.
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
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bandwidth code
Logic was:
if (mode0 && mode1)
else if (mode0)
else
Should be:
if (mode0 && mode1)
else if (mode0)
else if (mode1)
Otherwise we may end up calculating the priority regs with
unitialized values.
Fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=16492
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
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I wrote this for the prime sharing work, but I also noticed other external
non-upstream drivers from a large company carrying a similiar patch, so I
may as well ship it in master.
Signed-off-by: Dave Airlie <airlied@redhat.com>
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