- 08 Feb, 2016 35 commits
-
-
Alexander Shishkin authored
Currently, the list of stm_sources linked to an stm device is protected by a spinlock, which also means that sources' .unlink() method is called under this spinlock. However, this method may (and does) sleep, which means trouble. This patch slightly reworks locking around stm::link_list so that bits that might_sleep() are called with a mutex held instead. Modification of this list requires both mutex and spinlock to be held, while looking at the list can be done under either mutex or spinlock. Signed-off-by:
Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-
Alexander Shishkin authored
Right now, if stm device removal has to unbind from a policy (that is, an stm device that has STP policy, gets removed), it will trigger a nested lock on the stm device's policy mutex. This patch fixes the problem by moving the locking from the policy unbinding to policy removal (configfs path), where it's actually needed; the other caller of the policy unbinding function already takes the mutex around the call. Signed-off-by:
-
Arnd Bergmann authored
The newly added STM code uses SRCU, but does not ensure that this code is part of the kernel: drivers/built-in.o: In function `stm_source_link_show': include/linux/srcu.h:221: undefined reference to `__srcu_read_lock' include/linux/srcu.h:238: undefined reference to `__srcu_read_unlock' drivers/built-in.o: In function `stm_source_link_drop': include/linux/srcu.h:221: undefined reference to `__srcu_read_lock' include/linux/srcu.h:238: undefined reference to `__srcu_read_unlock' This adds a Kconfig 'select' statement like all the other SRCU using drivers have. Signed-off-by:
Arnd Bergmann <arnd@arndb.de> Fixes: 7bd1d409 ("stm class: Introduce an abstraction for System Trace Module devices") Signed-off-by:
-
Geert Uytterhoeven authored
If NO_DMA=y: ERROR: "dma_free_coherent" [drivers/hwtracing/intel_th/intel_th_msu.ko] undefined! ERROR: "dma_alloc_coherent" [drivers/hwtracing/intel_th/intel_th_msu.ko] undefined! ERROR: "dma_supported" [drivers/hwtracing/intel_th/intel_th.ko] undefined! Add a dependency on HAS_DMA to fix this. Signed-off-by:Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by:
-
Geert Uytterhoeven authored
If STM=n, it doesn't make sense to ask about STM_DUMMY and STM_SOURCE_CONSOLE support, which are not even built when enabled anyway. Hence hide these options if STM=n. Reported-by:
Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
-
Mathieu Poirier authored
Other than plainly parsing the device tree there is no way to know which CPU a tracer is affined to. As such adding an interface to lookup the CPU field enclosed in the etm_drvdata structure that was initialised at boot time. Signed-off-by:
Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by:
-
Mathieu Poirier authored
The coresight drivers have absolutely no control over bind and unbind operations triggered from sysfs. The operations simply can't be cancelled or denied event when one or several tracing sessions are under way. Since the memory associated to individual device is invariably freed, the end result is a kernel crash when the path from source to sink is travelled again as demonstrated here[1]. One solution could be to keep track of all the path (i.e tracing session) that get created and iterate through the elements of those path looking for the coresight device that is being removed. This proposition doesn't scale well since there is no upper bound on the amount of concurrent trace session that can be created. With the above in mind, this patch prevent devices from being unbounded from their driver by using the driver->suppress_bind_attr option. That way trace sessions can be managed without fearing to loose devices. Since device can't be removed anymore the xyz_remove() functions found in each driver is also removed. [1]. http://www.spinics.net/lists/arm-kernel/msg474952.htmlReported-by:
Rabin Vincent <rabin@rab.in> Signed-off-by:
-
Mathieu Poirier authored
In function 'coresight_unregister()', all references to the csdev that is being taken away need to be removed from the topology. Otherwise building the next coresight path from source to sink may use memory that has been released. Signed-off-by:
-
Mathieu Poirier authored
The reference count taken by function bus_find_device() needs to be released if a child device is found, something this patch is adding. Reported-by:
-
Mathieu Poirier authored
In its current form the code never frees csdev->refcnt allocated in coresight_register(). There is also a problem with csdev->conns that is freed before device_unregister() rather than in the device release function. This patch addresses both issues by moving kfree(csdev->conns) to coresight_device_release() and freeing csdev->refcnt, also in the same function. Reported-by:
-
Mathieu Poirier authored
On some platform the following lockdep error occurs when doing simple manipulations: [ 23.197021] [ 23.198608] ====================================================== [ 23.205078] [ INFO: possible circular locking dependency detected ] [ 23.211639] 4.4.0-rc8-00025-gbbf360b #172 Not tainted [ 23.216918] ------------------------------------------------------- [ 23.223480] sh/858 is trying to acquire lock: [ 23.228057] (coresight_mutex){+.+.+.}, at: [<c0415d40>] coresight_enable+0x1c/0x1b4 [ 23.236206] [ 23.236206] but task is already holding lock: [ 23.242309] (s_active#52){++++.+}, at: [<c01d4b40>] kernfs_fop_write+0x5c/0x1c0 [ 23.250122] [ 23.250122] which lock already depends on the new lock. [ 23.250122] [ 23.258697] [ 23.258697] the existing dependency chain (in reverse order) is: [ 23.266510] -> #1 (s_active#52){++++.+}: [ 23.270843] [<c01d30ec>] __kernfs_remove+0x294/0x35c [ 23.276672] [<c01d3e44>] kernfs_remove_by_name_ns+0x44/0x8c [ 23.283172] [<c01d6318>] remove_files+0x3c/0x84 [ 23.288543] [<c01d66b4>] sysfs_remove_group+0x48/0x9c [ 23.294494] [<c01d6734>] sysfs_remove_groups+0x2c/0x3c [ 23.300506] [<c030b658>] device_remove_attrs+0x5c/0x74 [ 23.306549] [<c030c290>] device_del+0x110/0x218 [ 23.311950] [<c030c3c4>] device_unregister+0x2c/0x6c [ 23.317779] [<c04156d8>] coresight_unregister+0x30/0x40 [ 23.323883] [<c041a290>] etm_probe+0x228/0x2e8 [ 23.329193] [<c02bc760>] amba_probe+0xe4/0x160 [ 23.334503] [<c0310540>] driver_probe_device+0x23c/0x480 [ 23.340728] [<c0310820>] __driver_attach+0x9c/0xa0 [ 23.346374] [<c030e400>] bus_for_each_dev+0x70/0xa4 [ 23.352142] [<c030fcf4>] driver_attach+0x24/0x28 [ 23.357604] [<c030f86c>] bus_add_driver+0x1e0/0x278 [ 23.363372] [<c0310d48>] driver_register+0x80/0x100 [ 23.369110] [<c02bc508>] amba_driver_register+0x58/0x5c [ 23.375244] [<c0749514>] etm_driver_init+0x18/0x1c [ 23.380889] [<c0009918>] do_one_initcall+0xc4/0x20c [ 23.386657] [<c0715e7c>] kernel_init_freeable+0x160/0x208 [ 23.392974] [<c052d7fc>] kernel_init+0x18/0xf0 [ 23.398254] [<c0010850>] ret_from_fork+0x14/0x24 [ 23.403747] -> #0 (coresight_mutex){+.+.+.}: [ 23.408447] [<c008ed60>] lock_acquire+0xe4/0x210 [ 23.413909] [<c0530a30>] mutex_lock_nested+0x74/0x450 [ 23.419860] [<c0415d40>] coresight_enable+0x1c/0x1b4 [ 23.425689] [<c0416030>] enable_source_store+0x58/0x68 [ 23.431732] [<c030b358>] dev_attr_store+0x20/0x2c [ 23.437286] [<c01d55e8>] sysfs_kf_write+0x50/0x54 [ 23.442871] [<c01d4ba8>] kernfs_fop_write+0xc4/0x1c0 [ 23.448699] [<c015b60c>] __vfs_write+0x34/0xe4 [ 23.454040] [<c015bf38>] vfs_write+0x98/0x174 [ 23.459228] [<c015c7a8>] SyS_write+0x4c/0xa8 [ 23.464355] [<c00107c0>] ret_fast_syscall+0x0/0x1c [ 23.470031] [ 23.470031] other info that might help us debug this: [ 23.470031] [ 23.478393] Possible unsafe locking scenario: [ 23.478393] [ 23.484619] CPU0 CPU1 [ 23.489349] ---- ---- [ 23.494079] lock(s_active#52); [ 23.497497] lock(coresight_mutex); [ 23.503906] lock(s_active#52); [ 23.509918] lock(coresight_mutex); [ 23.513702] [ 23.513702] *** DEADLOCK *** [ 23.513702] [ 23.519897] 3 locks held by sh/858: [ 23.523529] #0: (sb_writers#7){.+.+.+}, at: [<c015ec38>] __sb_start_write+0xa8/0xd4 [ 23.531799] #1: (&of->mutex){+.+...}, at: [<c01d4b38>] kernfs_fop_write+0x54/0x1c0 [ 23.539916] #2: (s_active#52){++++.+}, at: [<c01d4b40>] kernfs_fop_write+0x5c/0x1c0 [ 23.548156] [ 23.548156] stack backtrace: [ 23.552734] CPU: 0 PID: 858 Comm: sh Not tainted 4.4.0-rc8-00025-gbbf360b #172 [ 23.560302] Hardware name: Generic OMAP4 (Flattened Device Tree) [ 23.566589] Backtrace: [ 23.569152] [<c00154d4>] (dump_backtrace) from [<c00156d0>] (show_stack+0x18/0x1c) [ 23.577087] r7:ed4b8570 r6:c0936400 r5:c07ae71c r4:00000000 [ 23.583038] [<c00156b8>] (show_stack) from [<c027e69c>] (dump_stack+0x98/0xc0) [ 23.590606] [<c027e604>] (dump_stack) from [<c008a750>] (print_circular_bug+0x21c/0x33c) [ 23.599090] r5:c0939d60 r4:c0936400 [ 23.602874] [<c008a534>] (print_circular_bug) from [<c008e370>] (__lock_acquire+0x1c98/0x1d88) [ 23.611877] r10:00000003 r9:c0fd7a5c r8:ed4b8550 r7:ed4b8570 r6:ed4b8000 r5:c0ff69e4 [ 23.620117] r4:c0936400 r3:ed4b8550 [ 23.623901] [<c008c6d8>] (__lock_acquire) from [<c008ed60>] (lock_acquire+0xe4/0x210) [ 23.632080] r10:00000000 r9:00000000 r8:60000013 r7:c07cb7b4 r6:00000001 r5:00000000 [ 23.640350] r4:00000000 [ 23.643005] [<c008ec7c>] (lock_acquire) from [<c0530a30>] (mutex_lock_nested+0x74/0x450) [ 23.651458] r10:ecc0bf80 r9:edbe7dcc r8:ed4b8000 r7:c0fd7a5c r6:c0415d40 r5:00000000 [ 23.659729] r4:c07cb780 [ 23.662384] [<c05309bc>] (mutex_lock_nested) from [<c0415d40>] (coresight_enable+0x1c/0x1b4) [ 23.671234] r10:ecc0bf80 r9:edbe7dcc r8:ed733c00 r7:00000000 r6:ed733c00 r5:00000002 [ 23.679473] r4:ed762140 [ 23.682128] [<c0415d24>] (coresight_enable) from [<c0416030>] (enable_source_store+0x58/0x68) [ 23.691070] r7:00000000 r6:ed733c00 r5:00000002 r4:ed762160 [ 23.697052] [<c0415fd8>] (enable_source_store) from [<c030b358>] (dev_attr_store+0x20/0x2c) [ 23.705780] r5:edbe7dc0 r4:c0415fd8 [ 23.709533] [<c030b338>] (dev_attr_store) from [<c01d55e8>] (sysfs_kf_write+0x50/0x54) [ 23.717834] r5:edbe7dc0 r4:c030b338 [ 23.721618] [<c01d5598>] (sysfs_kf_write) from [<c01d4ba8>] (kernfs_fop_write+0xc4/0x1c0) [ 23.730163] r7:00000000 r6:00000000 r5:00000002 r4:edbe7dc0 [ 23.736145] [<c01d4ae4>] (kernfs_fop_write) from [<c015b60c>] (__vfs_write+0x34/0xe4) [ 23.744323] r10:00000000 r9:ecc0a000 r8:c0010964 r7:ecc0bf80 r6:00000002 r5:c01d4ae4 [ 23.752593] r4:ee385a40 [ 23.755249] [<c015b5d8>] (__vfs_write) from [<c015bf38>] (vfs_write+0x98/0x174) [ 23.762908] r9:ecc0a000 r8:c0010964 r7:ecc0bf80 r6:000ab0d8 r5:00000002 r4:ee385a40 [ 23.771057] [<c015bea0>] (vfs_write) from [<c015c7a8>] (SyS_write+0x4c/0xa8) [ 23.778442] r8:c0010964 r7:00000002 r6:000ab0d8 r5:ee385a40 r4:ee385a40 [ 23.785522] [<c015c75c>] (SyS_write) from [<c00107c0>] (ret_fast_syscall+0x0/0x1c) [ 23.793457] r7:00000004 r6:00000001 r5:000ab0d8 r4:00000002 [ 23.799652] coresight-etb10 54162000.etb: ETB enabled [ 23.805084] coresight-funnel 54164000.funnel: FUNNEL inport 0 enabled [ 23.811859] coresight-replicator 44000000.ocp:replicator: REPLICATOR enabled [ 23.819335] coresight-funnel 54158000.funnel: FUNNEL inport 0 enabled [ 23.826110] coresight-etm3x 5414c000.ptm: ETM tracing enabled The locking in coresight_unregister() is not required as the only customers of the function are drivers themselves when an initialisation failure has been encoutered. Reported-by: -
Mathieu Poirier authored
Signed-off-by:
-
Jorgen Hansen authored
This change restricts the reading and setting of the head and tail pointers on 32bit X86 to 32bit for both correctness and performance reasons. On uniprocessor X86_32, the atomic64_read may be implemented as a non-locked cmpxchg8b. This may result in updates to the pointers done by the VMCI device being overwritten. On MP systems, there is no such correctness issue, but using 32bit atomics avoids the overhead of the locked 64bit operation. All this is safe because the queue size on 32bit systems will never exceed a 32bit value. Reviewed-by:
Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by:
Jorgen Hansen <jhansen@vmware.com> Signed-off-by:
-
K. Y. Srinivasan authored
On the channel send side, many of the VMBUS device drivers explicity serialize access to the outgoing ring buffer. Give more control to the VMBUS device drivers in terms how to serialize accesss to the outgoing ring buffer. The default behavior will be to aquire the ring lock to preserve the current behavior. Signed-off-by:
K. Y. Srinivasan <kys@microsoft.com> Signed-off-by:
-
K. Y. Srinivasan authored
The function hv_ringbuffer_read() is called always on a pre-assigned CPU. Each chnnel is bound to a specific CPU and this function is always called on the CPU the channel is bound. There is no need to acquire the spin lock; get rid of this overhead. Signed-off-by:
-
Dexuan Cui authored
The hvsock driver needs this API to release all the resources related to the channel. Signed-off-by:
Dexuan Cui <decui@microsoft.com> Signed-off-by:
-
Dexuan Cui authored
This will be used by the coming hv_sock driver. Signed-off-by:
-
Dexuan Cui authored
Only the coming hv_sock driver has a "true" value for this flag. We treat the hvsock offers/channels as special VMBus devices. Since the hv_sock driver handles all the hvsock offers/channels, we need to tweak vmbus_match() for hv_sock driver, so we introduce this flag. Signed-off-by:
-
Dexuan Cui authored
A function to send the type of message is also added. The coming net/hvsock driver will use this function to proactively request the host to offer a VMBus channel for a new hvsock connection. Signed-off-by:
-
Dexuan Cui authored
When the hvsock channel's outbound ringbuffer is full (i.e., hv_ringbuffer_write() returns -EAGAIN), we should avoid the unnecessary signaling the host. Signed-off-by:
-
Dexuan Cui authored
A helper function is also added. Signed-off-by:
-
Dexuan Cui authored
This will be used by the coming net/hvsock driver. Signed-off-by:
-
Vitaly Kuznetsov authored
clocksource_change_rating() involves mutex usage and can't be called in interrupt context. It also makes sense to avoid doing redundant work on crash. Signed-off-by:
Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by:
-
Vitaly Kuznetsov authored
We have to call vmbus_initiate_unload() on crash to make kdump work but the crash can also be happening in interrupt (e.g. Sysrq + c results in such) where we can't schedule or the following will happen: [ 314.905786] bad: scheduling from the idle thread! Just skipping the wait (and even adding some random wait here) won't help: to make host-side magic working we're supposed to receive CHANNELMSG_UNLOAD (and actually confirm the fact that we received it) but we can't use interrupt-base path (vmbus_isr()-> vmbus_on_msg_dpc()). Implement a simple busy wait ignoring all the other messages and use it if we're in an interrupt context. Signed-off-by:
-
Vitaly Kuznetsov authored
When we pick a CPU to use for a new subchannel we try find a non-used one on the appropriate NUMA node, we keep track of them with the primary->alloced_cpus_in_node mask. Under normal circumstances we don't run out of available CPUs but it is possible when we we don't initialize some cpus in Linux, e.g. when we boot with 'nr_cpus=' limitation. Avoid the infinite loop in init_vp_index() by checking that we still have non-used CPUs in the alloced_cpus_in_node mask and resetting it in case we don't. Signed-off-by:
-
Kamal Mostafa authored
Use the local uapi headers to keep in sync with "recently" added #define's (e.g. VSS_OP_REGISTER1). Fixes: 3eb2094c ("Adding makefile for tools/hv") Cc: <stable@vger.kernel.org> Signed-off-by:
Kamal Mostafa <kamal@canonical.com> Signed-off-by:
-
K. Y. Srinivasan authored
Add vendor and device attributes to VMBUS devices. These will be used by Hyper-V tools as well user-level RDMA libraries that will use the vendor/device tuple to discover the RDMA device. Signed-off-by:
-
K. Y. Srinivasan authored
Cleanup vmbus_set_event() by inlining the hypercall to post the event and since the return value of vmbus_set_event() is not checked, make it void. As part of this cleanup, get rid of the function hv_signal_event() as it is only callled from vmbus_set_event(). Signed-off-by:
-
Dan Carpenter authored
We recently messed up the error handling here. We can return with the pipe->lock held or sometimes we unlock twice by mistake. Fixes: 2f3be882 ('goldfish_pipe: Pin pages to memory while copying and other cleanups') Signed-off-by:
Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by:
Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by:
-
Eric Biggers authored
The error code passed to ERR_PTR() always should be negated. Also, the return value of scif_add_mmu_notifier() was never checked. Signed-off-by:
Eric Biggers <ebiggers3@gmail.com> Reviewed-by:
Sudeep Dutt <sudeep.dutt@intel.com> Signed-off-by:
-
Geliang Tang authored
list_next_entry has been defined in list.h, so I replace list_entry_next with it. Signed-off-by:
Geliang Tang <geliangtang@163.com> Reviewed-by:
-
Dan Carpenter authored
Signed integer overflow is undefined. Also I added a check for "(offset < 0)" in scif_unregister() because that makes it match the other conditions and because I didn't want to subtract a negative. Fixes: ba612aa8 ('misc: mic: SCIF memory registration and unregistration') Signed-off-by:
-
Christian Colic authored
Rewrite comparisons to NULL "data->reg_base == NULL" as "!data->reg_base" to conform to checkpatch. Signed-off-by:
Christian Colic <colic.christian@gmail.com> Signed-off-by:
-
Christian Colic authored
Added a space around the "+" at: "reg_base+addr2" to clear up a checkpatch check. Signed-off-by:
-
Arnd Bergmann authored
The goldfish nand driver divides a signed 64-bit number (loff_t) in multiple places using the do_div() function. This has always been unreliable but now produces a compiler warning (since 4.5-rc1): goldfish/goldfish_nand.c: In function 'goldfish_nand_erase': goldfish/goldfish_nand.c:107:91: error: comparison of distinct pointer types lacks a cast [-Werror] goldfish/goldfish_nand.c: In function 'goldfish_nand_read_oob': goldfish/goldfish_nand.c:145:91: error: comparison of distinct pointer types lacks a cast [-Werror] This changes the code to the equivalent div_s64{,_rem} that works correctly for negative numbers (which we should never get here). The warning has shown up on ARM allmodconfig builds after the goldfish bus driver has become visible on ARM. Signed-off-by:Alan Cox <alan@linux.intel.com> Signed-off-by:
-
- 07 Feb, 2016 5 commits
-
-
Alexander Usyskin authored
The amthif FW client can appear after the end of client enumeration. Amthif host client initialization is done now at FW client discovery time. Signed-off-by:
Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by:
Tomas Winkler <tomas.winkler@intel.com> Signed-off-by:
-
Alexander Usyskin authored
Signal the FW that it can send an HBM enumeration answer immediately, without waiting for FW initialization completion, meaning before all the FW clients are ready and registered. Organize enumeration response options to enum as a byproduct. Signed-off-by:
-
Alexander Usyskin authored
Since clients can be now added and removed during runtime we need to run bus rescan whenever me_clients list is modified. Signed-off-by:
-
Alexander Usyskin authored
The reserved host clients can be obsoleted now, a portion of the platforms is shipped without iAMT enabled, where the reservation is not relevant and for platforms with iAMT dynamic allocation is sufficient. Dropping reserved ids makes enumeration more flexible and generic Signed-off-by:
-
Alexander Usyskin authored
The FW can initiate client disconnection only because an error condition, hence it make sense to bump the debug message to the warning level to have an entery in the log. Signed-off-by:
-
