prctl: adds PR_SET_TIMERSLACK_PID for setting timer slack of an arbitrary thread.

Second argument is similar to PR_SET_TIMERSLACK, if non-zero then the
slack is set to that value otherwise sets it to the default for the thread.

Takes PID of the thread as the third argument.

This allows power/performance management software to set timer slack for
other threads according to its policy for the thread (such as when the
thread is designated foreground vs. background activity)

Change-Id: I744d451ff4e60dae69f38f53948ff36c51c14a3f
Signed-off-by: Ruchi Kandoi <kandoiruchi@google.com>
prctl: adds the capable(CAP_SYS_NICE) check to PR_SET_TIMERSLACK_PID.

Adds a capable() check to make sure that arbitary apps do not change the
timer slack for other apps.

Bug: 15000427
Change-Id: I558a2551a0e3579c7f7e7aae54b28aa9d982b209
Signed-off-by: Ruchi Kandoi <kandoiruchi@google.com>
uio: msm_sharedmem: Add new device driver for sharedmemory access

Add new device driver to provide a standard interface for its
clients (like RemoteFS and RFSA) to be able to memory map their
respective allotted shared memory address in the client's address space.
The shared memory (a transport buffer) address is unique for each
individual client and is made available to the driver via device tree.

This driver uses the existing UIO framework to facilitate the clients
mmap requirements. Each individual client will be able to use a unique
UIO device for this purpose.

CRs-Fixed: 477427
Bug: 12784954
Change-Id: If07b88086b5f1b87845962818094644575629fcf
Signed-off-by: Pratibhasagar V <pratibha@codeaurora.org>
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
Signed-off-by: Mekala Natarajan <mekalan@codeaurora.org>
ARM: dts: msm: Add support for UIO devices for RemoteFS for APQ8064

The RemoteFS server now uses the UIO driver. So add the UIO
device for APQ8064

CRs-Fixed: 592586
Bug: 12784954
Change-Id: Ia0d643a10827869bfe527bf15ba064842e509487
Signed-off-by: Pratibhasagar V <pratibha@codeaurora.org>
Signed-off-by: Mekala Natarajan <mekalan@codeaurora.org>
uio: msm_shared: Add support for platform data

Update the driver to support backward compatibility for devices
relying on board files for platform data.

CRs-Fixed: 592586
Bug: 12784954
Change-Id: I04d4195a7fd4b926e52b0cbb2bb33cfcc054689f
Signed-off-by: Pratibhasagar V <pratibha@codeaurora.org>
Signed-off-by: Mekala Natarajan <mekalan@codeaurora.org>
uio: provide vm access to UIO_MEM_PHYS maps

This makes it possible to let gdb access mappings of the process that is
being debugged.

uio_mmap_logical was moved and uio_vm_ops renamed to group related code
and differentiate to new stuff.

CRs-Fixed: 570735
Change-Id: I8a5ff343727cc58fedfeb73f3466cc9a7f153e84
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Git-commit: 7294151d0592e0ff48c61fca9fd7c93d613134da
Git-repo: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git
Signed-off-by: Pratibhasagar V <pratibha@codeaurora.org>
Signed-off-by: Ed Tam <etam@google.com>
Fix a few incorrectly checked [io_]remap_pfn_range() calls

Nico Golde reports a few straggling uses of [io_]remap_pfn_range() that
really should use the vm_iomap_memory() helper.  This trivially converts
two of them to the helper, and comments about why the third one really
needs to continue to use remap_pfn_range(), and adds the missing size
check.

CRs-Fixed: 570735
Change-Id: I927a67ea80fea5ed706749ead9defb1e72633952
Reported-by: Nico Golde <nico@ngolde.de>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org.
Git-commit: 7314e613d5ff9f0934f7a0f74ed7973b903315d1
Git-repo: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git
[pratibha@codeaurora.org:resolve trivial merge conflicts]
Signed-off-by: Pratibhasagar V <pratibha@codeaurora.org>

Signed-off-by: Ed Tam <etam@google.com>
Revert "Use pgprot_writecombine in ion_system_heap_map_kernel for optimization."

This reverts commit 4667d77bb0e479da744f1c7163880cc798111dae.
Revert "msm: gpu: add optimization flags to GPU drivers"

This reverts commit 849ee874df7dc8dfbef76d242c5957cf59b5db7e.
Revert "msm: kgsl: report gpu frequency correctly in sysfs"

This reverts commit 370dcef1e51e6704667319f1cf765305d4c33a43.
msm: kgsl: Panic if global timestamp wait fails in context detach

If we timeout while waiting for the last issued global timestamp for
a detaching context to expire (10 seconds!) then we are on a fast
train to crashville.  BUG_ON() so we can stand a chance of debugging
this very rare issue.

Change-Id: Ic0dedbaddb9cbc5681f9c872785ce26b7cf9b87b
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
msm: kgsl: Force the ME off before reading the microcode

On A3XX reading the microcode while the CP is running is dangerous
beyond words.  By setting the offset address for the read, we are
essentially changing the instruction pointer for the ME while it
is running causing opcode errors, gpu faults and/or system errors.

We do not want to stop the CP at the beginning of the snapshot
process beacuse doing so changes the RBBM status and the state of
the CP registers which may damage the debug effort.  But by the
time we get to the microcode read we no longer care about the state
of the registers so we can freely halt the ME just before starting
the read.

CRs-fixed: 585449
Change-Id: Ic0dedbad85d7ec26915f054dd597e226e8101a29
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
msm: kgsl: Fix mem leak when page allocation fails

Page allocation may fail during OOM condition. Update
sglen and size to correct value (allocated) so that
they get freed in kgsl_sharedmem_free().

Change-Id: I1aa0ca77bb767523dfcf0f6cc3a21eac2b6b80e4
Signed-off-by: Hareesh Gundu <hareeshg@codeaurora.org>
msm: kgsl: Restrict the maximum memory entries for bulk cache sync

Restrict the maximum number of memory entries that can be specified
to a single bulk cache sync call to PAGE_SIZE / sizeof(unsigned int)
so that the allocation can always fit within one page.

CRs-fixed: 578062
Change-Id: Ic0dedbad07e1986cd6ccc5b260ffef82b5adb6d3
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
msm: kgsl: Protect against a potential overflow in kgsl_sg_alloc

Avoid allocating a scatterlist so large that it overflows the size
passed to the memory allocators.

CRs-fixed: 564448
Change-Id: Ic0dedbad2ab421ddec8f3be38d61c9bdf9ae5bd4
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
msm: kgsl: avoid zero length scatterlist allocation

During sglist allocation we calculate sglen as
per below

sglen_alloc = PAGE_ALIGN(size) >> PAGE_SHIFT;

sglen_alloc can be zero if size falls within the
last page. For example, when size = 0xFFFF_FF7B,
PAGE_ALIGN(0xFFFF_FF7B) will be 0, considering
0x1000 (4kb) PAGE_SIZE. if kzalloc() with
zero size, it will return ZERO_SIZE_PTR which is
not NULL and we always do NULL check. Dereferencing
ZERO_SIZE_PTR will lead to a distinct access fault.

Change-Id: Ibcc6198438c13b5111be0faa736328db92511597
CRs-Fixed: 563106
Signed-off-by: Prakash Kamliya <pkamliya@codeaurora.org>
msm: kgsl: Fix several possible problem spots in the dispatcher

Fix a few spots that the compiler warnings missed. Avoid
dereferencing a pointer that may have returned ERR_PTR() without
first checking to see that if it did return ERR_PTR() and correct
an egregious signed / unsigned mixup. Not sure why the compiler
didn't yell at me for that one.

Change-Id: Ic0dedbadf075b34e51a89ce625d2308c5171a58d
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
msm: kgsl: when unmapping from the mmu flush the entire tlb

Flushes the entire tlb when calling mmu_unmap to make sure there
is no race condition between unmapping and freeing the pages.

Change-Id: I911f8479a3aef2006f9df40a3419284423937542
Signed-off-by: Shrenuj Bansal <shrenujb@codeaurora.org>
msm: kgsl: Prevent device start after it is already started

Check if device is already started in high priority workqueue thread,
this check prevents calling device start after it is already started,
thereby avoiding unpredictable behavior.

Change-Id: Iffcd065f8c02746d168c8e5779d10d4b0e2404a9
Signed-off-by: Tarun Karra <tkarra@codeaurora.org>
msm: kgsl: When switching pagetable use current context ID

When we switch pagetables then the pagetable switch commands
should be executed on behalf of the current active context and
not the context to which we are switching. This is because
until the pagetable switch occurs the GPU will be using the
pagetable of the active context.

CRs-fixed: 574989
Change-Id: I9ca65ea399e39a158dc72adc2c7b661f62f18c93
Signed-off-by: Shubhraprakash Das <sadas@codeaurora.org>