- 31 Aug, 2016 37 commits
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Mathieu Poirier authored
This patch implements the required API needed to access and retrieve range and start/stop filters from the perf core. Signed-off-by:
Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Mathieu Poirier authored
Both ETMv3 and ETMv4 drivers are declaring an 'enum etm_addr_type', creating reduncancy. This patch removes the enumeration from the driver files and adds it to a common header. Signed-off-by:
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Mathieu Poirier authored
With this commit [1] address range filter information is now found in the struct hw_perf_event::addr_filters. As such pass the event itself to the coresight_source::enable/disable() functions so that both event attribute and filter can be accessible for configuration. [1] 'commit 375637bc ("perf/core: Introduce address range filtering")' Signed-off-by:
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Sudeep Holla authored
The ETM registers are classified into 2 categories: trace and management. The core power domain contains most of the trace unit logic including all(except TRCOSLAR and TRCOSLSR) the trace registers. The debug power domain contains the external debugger interface including all management registers. This patch adds coresight unit specific function coresight_simple_func which can be used for ETM trace registers by providing a ETM specific read function which does smp cross call to ensure the trace core is powered up before the register is accessed. Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by:
Sudeep Holla <sudeep.holla@arm.com> Signed-off-by:
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Sudeep Holla authored
The Coresight ETMv4 architecture provides a way to request to keep the power to the trace unit. This might help to collect the traces without the need to disable the CPU power management(entering/exiting deeper idle states). Trace PowerDown Control Register provides powerup request bit which when set requests the system to retain power to the trace unit and emulate the powerdown request. Typically, a trace unit drives a signal to the power controller to request that the trace unit core power domain is powered up. However, if the trace unit and the CPU are in the same power domain then the implementation might combine the trace unit power up status with a signal from the CPU. This patch requests to retain power to the trace unit when active and to remove when inactive. Note this change will only request but the behaviour depends on the implementation. However, it matches the exact behaviour expected when the external debugger is connected with respect to CPU power states. Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by:
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Markus Elfring authored
The kfree() function tests whether its argument is NULL and then returns immediately. Thus the test around the call is not needed. This issue was detected by using the Coccinelle software. Signed-off-by:
Markus Elfring <elfring@users.sourceforge.net> Signed-off-by:
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Wei Yongjun authored
Remove duplicated include. Signed-off-by:
Wei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by:
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Suzuki K Poulose authored
Each coresight device prepares a description for coresight_register() in struct coresight_desc. Once we register the device, the description is useless and can be freed. The coresight_desc is small enough (48bytes on 64bit)i to be allocated on the stack. Hence use an automatic variable to avoid a needless dynamic allocation and wasting the memory(which will only be free'd when the device is destroyed). Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Pratik Patel <pratikp@codeaurora.org> Signed-off-by:
Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by:
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Peter Chen authored
of_node_put needs to be called when the device node which is got from of_parse_phandle has finished using. Cc: linux-arm-kernel@lists.infradead.org Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by:
Peter Chen <peter.chen@nxp.com> Signed-off-by:
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Olivier Schonken authored
Signed-off-by:
Olivier Schonken <olivier.schonken@gmail.com> Signed-off-by:
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Mathieu Poirier authored
It is mandatory to enable a coresight block's power domain before trying to access management registers. Otherwise the transaction simply stalls, leading to a system hang. Signed-off-by:
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Mathieu Poirier authored
Depending on when CoreSight device are discovered it is possible that some IP block may be referencing devices that have not been added to the bus yet. The end result is missing nodes in the CoreSight topology even when the devices are present and properly initialised. This patch solves the problem by asking the driver core to try initialising the device at a later time when the children of a CoreSight node are missing. Signed-off-by:
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Suzuki K Poulose authored
When we encounter a timeout waiting for a status change via coresight_timeout, the caller always print the offset which was tried. This is pretty much useless as it doesn't specify the bit position we wait for. Also, one needs to lookup the TRM to figure out, what was wrong. This patch changes all such error messages to print something more meaningful. Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by:
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Suzuki K Poulose authored
Use the defined symbol rather than hardcoding the value to check whether the TMC buffer is full. Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by:
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Suzuki K Poulose authored
This patch cleans up the peripheral id table for different ETMv4 implementations. As per Cortex-A53 TRM, the ETM has following id values: Peripheral ID0 0x5D 0xFE0 Peripheral ID1 0xB9 0xFE4 Peripheral ID2 0x4B 0xFE8 Peripheral ID3 0x00 0xFEC where, PID2: has the following format: [7:4] Revision [3] JEDEC 0b1 res1. Indicates a JEP106 identity code is used [2:0] DES_1 0b011 ARM Limited. This is bits[6:4] of JEP106 ID code The existing table entry checks only the bits [1:0], which is not sufficient enough. Fix it to match bits [3:0], just like the other entries do. While at it, correct the comment for A57 and the A53 entry. Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by:
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Suzuki K Poulose authored
At present the ETF or ETR gives out the entire device buffer, even if there is less or even no trace data available. This patch limits the trace data given out to the actual trace data collected. Cc: mathieu.poirier@linaro.org Signed-off-by:
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Suzuki K Poulose authored
This is a cleanup patch. coresight_device->conns holds an array to point to the devices connected to the OUT ports of a component. Sinks, e.g ETR, do not have an OUT port (nr_outport = 0), as it streams the trace to memory via AXI. At coresight_register() we do : conns = kcalloc(csdev->nr_outport, sizeof(*conns), GFP_KERNEL); if (!conns) { ret = -ENOMEM; goto err_kzalloc_conns; } For ETR, since the total size requested for kcalloc is zero, the return value is, ZERO_SIZE_PTR ( != NULL). Hence, csdev->conns = ZERO_SIZE_PTR which cannot be verified later to contain a valid pointer. The code which accesses the csdev->conns is bounded by the csdev->nr_outport check, hence we don't try to dereference the ZERO_SIZE_PTR. This patch cleans up the csdev->conns initialisation to make sure we initialise it properly(i.e, either NULL or valid conns array). Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: -
Suzuki K Poulose authored
This patch cleans up the error handling path for tmc_probe as a side effect of the removal of the spurious dma_free_coherent(). Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by:
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Suzuki K Poulose authored
commit de546197 ("coresight: tmc: allocating memory when needed") removed the static allocation of buffer for the trace data in ETR mode in tmc_probe. However it failed to remove the "devm_free_coherent" in tmc_probe when the probe fails due to other reasons. This patch gets rid of the incorrect dma_free_coherent() call. Fixes: commit de546197 ("coresight: tmc: allocating memory when needed") Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by:
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Sudeep Holla authored
etm4_trace_id is not guaranteed to be executed on the CPU whose ETM is being accessed. This leads to exception similar to below one if the CPU whose ETM is being accessed is in deeper idle states. So it must be executed on the CPU whose ETM is being accessed. Unhandled fault: synchronous external abort (0x96000210) at 0xffff000008db4040 Internal error: : 96000210 [#1] PREEMPT SMP Modules linked in: CPU: 5 PID: 5979 Comm: etm.sh Not tainted 4.7.0-rc3 #159 Hardware name: ARM Juno development board (r2) (DT) task: ffff80096dd34b00 ti: ffff80096dfe4000 task.ti: ffff80096dfe4000 PC is at etm4_trace_id+0x5c/0x90 LR is at etm4_trace_id+0x3c/0x90 Call trace: etm4_trace_id+0x5c/0x90 coresight_id_match+0x78/0xa8 bus_for_each_dev+0x60/0xa0 coresight_enable+0xc0/0x1b8 enable_source_store+0x3c/0x70 dev_attr_store+0x18/0x28 sysfs_kf_write+0x48/0x58 kernfs_fop_write+0x14c/0x1e0 __vfs_write+0x1c/0x100 vfs_write+0xa0/0x1b8 SyS_write+0x44/0xa0 el0_svc_naked+0x24/0x28 However, TRCTRACEIDR is not guaranteed to hold the previous programmed trace id if it enters deeper idle states. Further, the trace id that is computed in etm4_init_trace_id is programmed into TRCTRACEIDR only in etm4_enable_hw which happens much later in the sequence after coresight_id_match is executed from enable_source_store. This patch simplifies etm4_trace_id by returning the stashed trace id value similar to etm4_cpu_id. Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by:
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Chunyan Zhang authored
CoreSight STM device allows direct mapping of the channel regions to userspace for zero-copy writing. To support this ability, the STM framework has provided a hook 'mmio_addr', this patch just implemented this hook for CoreSight STM. This patch also added an item into 'channel_space' to save the physical base address of channel region which mmap operation needs to know. Signed-off-by:
Chunyan Zhang <zhang.chunyan@linaro.org> Signed-off-by:
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Sudeep Holla authored
If the addition of the coresight devices get deferred, then there's a window before child_name is populated by of_get_coresight_platform_data from the respective component driver's probe and the attempted to access the same from coresight_orphan_match resulting in kernel NULL pointer dereference as below: Unable to handle kernel NULL pointer dereference at virtual address 0x0 Internal error: Oops: 96000004 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 1038 Comm: kworker/0:1 Not tainted 4.7.0-rc3 #124 Hardware name: ARM Juno development board (r2) (DT) Workqueue: events amba_deferred_retry_func PC is at strcmp+0x1c/0x160 LR is at coresight_orphan_match+0x7c/0xd0 Call trace: strcmp+0x1c/0x160 bus_for_each_dev+0x60/0xa0 coresight_register+0x264/0x2e0 tmc_probe+0x130/0x310 amba_probe+0xd4/0x1c8 driver_probe_device+0x22c/0x418 __device_attach_driver+0xbc/0x158 bus_for_each_drv+0x58/0x98 __device_attach+0xc4/0x160 device_initial_probe+0x10/0x18 bus_probe_device+0x94/0xa0 device_add+0x344/0x580 amba_device_try_add+0x194/0x238 amba_deferred_retry_func+0x48/0xd0 process_one_work+0x118/0x378 worker_thread+0x48/0x498 kthread+0xd0/0xe8 ret_from_fork+0x10/0x40 This patch adds a check for non-NULL conn->child_name before accessing the same. Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by:
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Alex Ng authored
Reports for available memory should use the si_mem_available() value. The previous freeram value does not include available page cache memory. Signed-off-by:
Alex Ng <alexng@messages.microsoft.com> Signed-off-by:
K. Y. Srinivasan <kys@microsoft.com> Signed-off-by:
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Vitaly Kuznetsov authored
lockdep reports possible circular locking dependency when udev is used for memory onlining: systemd-udevd/3996 is trying to acquire lock: ((memory_chain).rwsem){++++.+}, at: [<ffffffff810d137e>] __blocking_notifier_call_chain+0x4e/0xc0 but task is already holding lock: (&dm_device.ha_region_mutex){+.+.+.}, at: [<ffffffffa015382e>] hv_memory_notifier+0x5e/0xc0 [hv_balloon] ... which is probably a false positive because we take and release ha_region_mutex from memory notifier chain depending on the arg. No real deadlocks were reported so far (though I'm not really sure about preemptible kernels...) but we don't really need to hold the mutex for so long. We use it to protect ha_region_list (and its members) and the num_pages_onlined counter. None of these operations require us to sleep and nothing is slow, switch to using spinlock with interrupts disabled. While on it, replace list_for_each -> list_for_each_entry as we actually need entries in all these cases, drop meaningless list_empty() checks. Signed-off-by:Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by:
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Vitaly Kuznetsov authored
With the recently introduced in-kernel memory onlining (MEMORY_HOTPLUG_DEFAULT_ONLINE) these is no point in waiting for pages to come online in the driver and we can get rid of the waiting. Signed-off-by:
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Vitaly Kuznetsov authored
I'm observing the following hot add requests from the WS2012 host: hot_add_req: start_pfn = 0x108200 count = 330752 hot_add_req: start_pfn = 0x158e00 count = 193536 hot_add_req: start_pfn = 0x188400 count = 239616 As the host doesn't specify hot add regions we're trying to create 128Mb-aligned region covering the first request, we create the 0x108000 - 0x160000 region and we add 0x108000 - 0x158e00 memory. The second request passes the pfn_covered() check, we enlarge the region to 0x108000 - 0x190000 and add 0x158e00 - 0x188200 memory. The problem emerges with the third request as it starts at 0x188400 so there is a 0x200 gap which is not covered. As the end of our region is 0x190000 now it again passes the pfn_covered() check were we just adjust the covered_end_pfn and make it 0x188400 instead of 0x188200 which means that we'll try to online 0x188200-0x188400 pages but these pages were never assigned to us and we crash. We can't react to such requests by creating new hot add regions as it may happen that the whole suggested range falls into the previously identified 128Mb-aligned area so we'll end up adding nothing or create intersecting regions and our current logic doesn't allow that. Instead, create a list of such 'gaps' and check for them in the page online callback. Signed-off-by:
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Vitaly Kuznetsov authored
Windows 2012 (non-R2) does not specify hot add region in hot add requests and the logic in hot_add_req() is trying to find a 128Mb-aligned region covering the request. It may also happen that host's requests are not 128Mb aligned and the created ha_region will start before the first specified PFN. We can't online these non-present pages but we don't remember the real start of the region. This is a regression introduced by the commit 5abbbb75 ("Drivers: hv: hv_balloon: don't lose memory when onlining order is not natural"). While the idea of keeping the 'moving window' was wrong (as there is no guarantee that hot add requests come ordered) we should still keep track of covered_start_pfn. This is not a revert, the logic is different. Signed-off-by:
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Vitaly Kuznetsov authored
KVP daemon does fork()/exec() (with popen()) so we need to close our fds to avoid sharing them with child processes. The immediate implication of not doing so I see is SELinux complaining about 'ip' trying to access '/dev/vmbus/hv_kvp'. Signed-off-by:
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K. Y. Srinivasan authored
On Hyper-V, performance critical channels use the monitor mechanism to signal the host when the guest posts mesages for the host. This mechanism minimizes the hypervisor intercepts and also makes the host more efficient in that each time the host is woken up, it processes a batch of messages as opposed to just one. The goal here is improve the throughput and this is at the expense of increased latency. Implement a mechanism to let the client driver decide if latency is important. Signed-off-by:
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K. Y. Srinivasan authored
The current delay between retries is unnecessarily high and is negatively affecting the time it takes to boot the system. Signed-off-by:
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K. Y. Srinivasan authored
For synthetic NIC channels, enable explicit signaling policy as netvsc wants to explicitly control when the host is to be signaled. Signed-off-by:
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Dexuan Cui authored
There is a rare race when we remove an entry from the global list hv_context.percpu_list[cpu] in hv_process_channel_removal() -> percpu_channel_deq() -> list_del(): at this time, if vmbus_on_event() -> process_chn_event() -> pcpu_relid2channel() is trying to query the list, we can get the kernel fault. Similarly, we also have the issue in the code path: vmbus_process_offer() -> percpu_channel_enq(). We can resolve the issue by disabling the tasklet when updating the list. The patch also moves vmbus_release_relid() to a later place where the channel has been removed from the per-cpu and the global lists. Reported-by:
Rolf Neugebauer <rolf.neugebauer@docker.com> Signed-off-by:
Dexuan Cui <decui@microsoft.com> Signed-off-by:
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Vitaly Kuznetsov authored
Background: userspace daemons registration protocol for Hyper-V utilities drivers has two steps: 1) daemon writes its own version to kernel 2) kernel reads it and replies with module version at this point we consider the handshake procedure being completed and we do hv_poll_channel() transitioning the utility device to HVUTIL_READY state. At this point we're ready to handle messages from kernel. When hvutil_transport is in HVUTIL_TRANSPORT_CHARDEV mode we have a single buffer for outgoing message. hvutil_transport_send() puts to this buffer and till the buffer is cleared with hvt_op_read() returns -EFAULT to all consequent calls. Host<->guest protocol guarantees there is no more than one request at a time and we will not get new requests till we reply to the previous one so this single message buffer is enough. Now to the race. When we finish negotiation procedure and send kernel module version to userspace with hvutil_transport_send() it goes into the above mentioned buffer and if the daemon is slow enough to read it from there we can get a collision when a request from the host comes, we won't be able to put anything to the buffer so the request will be lost. To solve the issue we need to know when the negotiation is really done (when the version message is read by the daemon) and transition to HVUTIL_READY state after this happens. Implement a callback on read to support this. Old style netlink communication is not affected by the change, we don't really know when these messages are delivered but we don't have a single message buffer there. Reported-by:
Barry Davis <barry_davis@stormagic.com> Signed-off-by:
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Vitaly Kuznetsov authored
vmbus_teardown_gpadl() can result in infinite wait when it is called on 5 second timeout in vmbus_open(). The issue is caused by the fact that gpadl teardown operation won't ever succeed for an opened channel and the timeout isn't always enough. As a guest, we can always trust the host to respond to our request (and there is nothing we can do if it doesn't). Signed-off-by:
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Vitaly Kuznetsov authored
In some cases create_gpadl_header() allocates submessages but we never free them. Signed-off-by:
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Vitaly Kuznetsov authored
We use messagecount only once in vmbus_establish_gpadl() to check if it is safe to iterate through the submsglist. We can just initialize the list header in all cases in create_gpadl_header() instead. Signed-off-by:
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Vitaly Kuznetsov authored
When we crash from NMI context (e.g. after NMI injection from host when 'sysctl -w kernel.unknown_nmi_panic=1' is set) we hit kernel BUG at mm/vmalloc.c:1530! as vfree() is denied. While the issue could be solved with in_nmi() check instead I opted for skipping vfree on all sorts of crashes to reduce the amount of work which can cause consequent crashes. We don't really need to free anything on crash. Signed-off-by:
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- 30 Aug, 2016 3 commits
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Chris Metcalf authored
Joe Perches points out [1] that this pattern isn't currently safe. This driver doesn't really need the zeroing semantic anyway; by restructuring the code slightly we can initialize all the fields of the structure up front instead. [1] https://lkml.kernel.org/r/1469729491.3998.58.camel@perches.comSigned-off-by:
Chris Metcalf <cmetcalf@mellanox.com> Signed-off-by:
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Muhammad Falak R Wani authored
Replace explicit computation of vma page count by a call to vma_pages() Signed-off-by:
Muhammad Falak R Wani <falakreyaz@gmail.com> Signed-off-by:
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Alexandre Belloni authored
v3.20 doesn't exist. heartbeat_enable was actually added in v4.4. Signed-off-by:
Alexandre Belloni <alexandre.belloni@free-electrons.com> Signed-off-by:
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