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2019-12-17intel_th: msu: Fix window switching without windowsAlexander Shishkin1-5/+9
Commit 6cac7866c2741 ("intel_th: msu: Add a sysfs attribute to trigger window switch") adds a NULL pointer dereference in the case when there are no windows allocated: > BUG: kernel NULL pointer dereference, address: 0000000000000000 > #PF: supervisor read access in kernel mode > #PF: error_code(0x0000) - not-present page > PGD 0 P4D 0 > Oops: 0000 1 SMP > CPU: 5 PID: 1110 Comm: bash Not tainted 5.5.0-rc1+ #1 > RIP: 0010:msc_win_switch+0xa/0x80 [intel_th_msu] > Call Trace: > ? win_switch_store+0x9b/0xc0 [intel_th_msu] > dev_attr_store+0x17/0x30 > sysfs_kf_write+0x3e/0x50 > kernfs_fop_write+0xda/0x1b0 > __vfs_write+0x1b/0x40 > vfs_write+0xb9/0x1a0 > ksys_write+0x67/0xe0 > __x64_sys_write+0x1a/0x20 > do_syscall_64+0x57/0x1d0 > entry_SYSCALL_64_after_hwframe+0x44/0xa9 Fix that by disallowing window switching with multiwindow buffers without windows. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Fixes: 6cac7866c274 ("intel_th: msu: Add a sysfs attribute to trigger window switch") Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reported-by: Ammy Yi <ammy.yi@intel.com> Tested-by: Ammy Yi <ammy.yi@intel.com> Cc: stable@vger.kernel.org # v5.2+ Link: https://lore.kernel.org/r/20191217115527.74383-5-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-12-17intel_th: Fix freeing IRQsAlexander Shishkin2-3/+6
Commit aac8da65174a ("intel_th: msu: Start handling IRQs") implicitly relies on the use of devm_request_irq() to subsequently free the irqs on device removal, but in case of the pci_free_irq_vectors() API, the handlers need to be freed before it is called. Therefore, at the moment the driver's remove path trips a BUG_ON(irq_has_action()): > kernel BUG at drivers/pci/msi.c:375! > invalid opcode: 0000 1 SMP > CPU: 2 PID: 818 Comm: rmmod Not tainted 5.5.0-rc1+ #1 > RIP: 0010:free_msi_irqs+0x67/0x1c0 > pci_disable_msi+0x116/0x150 > pci_free_irq_vectors+0x1b/0x20 > intel_th_pci_remove+0x22/0x30 [intel_th_pci] > pci_device_remove+0x3e/0xb0 > device_release_driver_internal+0xf0/0x1c0 > driver_detach+0x4c/0x8f > bus_remove_driver+0x5c/0xd0 > driver_unregister+0x31/0x50 > pci_unregister_driver+0x40/0x90 > intel_th_pci_driver_exit+0x10/0xad6 [intel_th_pci] > __x64_sys_delete_module+0x147/0x290 > ? exit_to_usermode_loop+0xd7/0x120 > do_syscall_64+0x57/0x1b0 > entry_SYSCALL_64_after_hwframe+0x44/0xa9 Fix this by explicitly freeing irqs before freeing the vectors. We keep using the devm_* variants because they are still useful in early error paths. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Fixes: aac8da65174a ("intel_th: msu: Start handling IRQs") Reported-by: Ammy Yi <ammy.yi@intel.com> Tested-by: Ammy Yi <ammy.yi@intel.com> Cc: stable@vger.kernel.org # v5.2+ Link: https://lore.kernel.org/r/20191217115527.74383-4-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-12-17intel_th: pci: Add Elkhart Lake SOC supportAlexander Shishkin1-0/+5
This adds support for Intel Trace Hub in Elkhart Lake. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20191217115527.74383-3-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-12-17intel_th: pci: Add Comet Lake PCH-V supportAlexander Shishkin1-0/+5
This adds Intel(R) Trace Hub PCI ID for Comet Lake PCH-V. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20191217115527.74383-2-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-20intel_th: pci: Add Tiger Lake CPU supportAlexander Shishkin1-0/+5
This adds support for the Trace Hub in Tiger Lake CPU. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20191120130806.44028-4-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-20intel_th: pci: Add Ice Lake CPU supportAlexander Shishkin1-0/+5
This adds support for the Trace Hub in Ice Lake CPU. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20191120130806.44028-3-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-20intel_th: Fix a double put_device() in error pathAlexander Shishkin1-6/+2
Commit a753bfcfdb1f ("intel_th: Make the switch allocate its subdevices") factored out intel_th_subdevice_alloc() from intel_th_populate(), but got the error path wrong, resulting in two instances of a double put_device() on a freshly initialized, but not 'added' device. Fix this by only doing one put_device() in the error path. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Fixes: a753bfcfdb1f ("intel_th: Make the switch allocate its subdevices") Reported-by: Wen Yang <wenyang@linux.alibaba.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: stable@vger.kernel.org # v4.14+ Link: https://lore.kernel.org/r/20191120130806.44028-2-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-04intel_th: pci: Add Jasper Lake PCH supportAlexander Shishkin1-0/+5
This adds support for Intel TH on Jasper Lake PCH. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20191028070651.9770-8-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-04intel_th: pci: Add Comet Lake PCH supportAlexander Shishkin1-0/+5
This adds support for Intel TH on Comet Lake PCH. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20191028070651.9770-7-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-04intel_th: msu: Fix possible memory leak in mode_store()Wei Yongjun1-1/+3
'mode' is malloced in mode_store() and should be freed before leaving from the error handling cases, otherwise it will cause memory leak. Fixes: 615c164da0eb ("intel_th: msu: Introduce buffer interface") Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/lkml/20190801013825.182543-1-weiyongjun1@huawei.com/ Link: https://lore.kernel.org/r/20191028070651.9770-6-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-04intel_th: msu: Fix overflow in shift of an unsigned intColin Ian King1-1/+1
The shift of the unsigned int win->nr_blocks by PAGE_SHIFT may potentially overflow. Note that the intended return of this shift is expected to be a size_t however the shift is being performed as an unsigned int. Fix this by casting win->nr_blocks to a size_t before performing the shift. Addresses-Coverity: ("Unintentional integer overflow") Fixes: 615c164da0eb ("intel_th: msu: Introduce buffer interface") Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/lkml/20190726113151.8967-1-colin.king@canonical.com/ Link: https://lore.kernel.org/r/20191028070651.9770-5-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-04intel_th: msu: Fix missing allocation failure check on a kstrndupColin Ian King1-0/+3
Commit 615c164da0eb ("intel_th: msu: Introduce buffer interface") forgot to add a NULL pointer check for the value returned from kstrdup(), which will be troublesome if the allocation fails. Fix that by adding the check. Addresses-Coverity: ("Dereference null return") Fixes: 615c164da0eb ("intel_th: msu: Introduce buffer interface") Signed-off-by: Colin Ian King <colin.king@canonical.com> [alexander.shishkin: amended the commit message] Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/lkml/20190726120421.9650-1-colin.king@canonical.com/ Link: https://lore.kernel.org/r/20191028070651.9770-4-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-04intel_th: msu: Fix an uninitialized mutexAlexander Shishkin1-1/+1
Commit 615c164da0eb ("intel_th: msu: Introduce buffer interface") added a mutex that it forgot to initialize, resulting in a lockdep splat. Fix that by initializing the mutex statically. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Fixes: 615c164da0eb ("intel_th: msu: Introduce buffer interface") Link: https://lore.kernel.org/r/20191028070651.9770-3-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-04intel_th: gth: Fix the window switching sequenceAlexander Shishkin1-0/+3
Commit 8116db57cf16 ("intel_th: Add switch triggering support") added a trigger assertion of the CTS, but forgot to de-assert it at the end of the sequence. This results in window switches randomly not happening. Fix that by de-asserting the trigger at the end of the window switch sequence. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Fixes: 8116db57cf16 ("intel_th: Add switch triggering support") Cc: stable <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20191028070651.9770-2-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-09-18Merge tag 'char-misc-5.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-miscLinus Torvalds4-100/+576
Pull char/misc driver updates from Greg KH: "Here is the big char/misc driver pull request for 5.4-rc1. As has been happening in previous releases, more and more individual driver subsystem trees are ending up in here. Now if that is good or bad I can't tell, but hopefully it makes your life easier as it's more of an aggregation of trees together to one merge point for you. Anyway, lots of stuff in here: - habanalabs driver updates - thunderbolt driver updates - misc driver updates - coresight and intel_th hwtracing driver updates - fpga driver updates - extcon driver updates - some dma driver updates - char driver updates - android binder driver updates - nvmem driver updates - phy driver updates - parport driver fixes - pcmcia driver fix - uio driver updates - w1 driver updates - configfs fixes - other assorted driver updates All of these have been in linux-next for a long time with no reported issues" * tag 'char-misc-5.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (200 commits) misc: mic: Use PTR_ERR_OR_ZERO rather than its implementation habanalabs: correctly cast variable to __le32 habanalabs: show correct id in error print habanalabs: stop using the acronym KMD habanalabs: display card name as sensors header habanalabs: add uapi to retrieve aggregate H/W events habanalabs: add uapi to retrieve device utilization habanalabs: Make the Coresight timestamp perpetual habanalabs: explicitly set the queue-id enumerated numbers habanalabs: print to kernel log when reset is finished habanalabs: replace __le32_to_cpu with le32_to_cpu habanalabs: replace __cpu_to_le32/64 with cpu_to_le32/64 habanalabs: Handle HW_IP_INFO if device disabled or in reset habanalabs: Expose devices after initialization is done habanalabs: improve security in Debug IOCTL habanalabs: use default structure for user input in Debug IOCTL habanalabs: Add descriptive name to PSOC app status register habanalabs: Add descriptive names to PSOC scratch-pad registers habanalabs: create two char devices per ASIC habanalabs: change device_setup_cdev() to be more generic ...
2019-09-17Merge tag 'leds-for-5.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-ledsLinus Torvalds1-9/+1
Pull LED updates from Jacek Anaszewski: "In this cycle we've finally managed to contribute the patch set sorting out LED naming issues. Besides that there are many changes scattered among various LED class drivers and triggers. LED naming related improvements: - add new 'function' and 'color' fwnode properties and deprecate 'label' property which has been frequently abused for conveying vendor specific names that have been available in sysfs anyway - introduce a set of standard LED_FUNCTION* definitions - introduce a set of standard LED_COLOR_ID* definitions - add a new {devm_}led_classdev_register_ext() API with the capability of automatic LED name composition basing on the properties available in the passed fwnode; the function is backwards compatible in a sense that it uses 'label' data, if present in the fwnode, for creating LED name - add tools/leds/get_led_device_info.sh script for retrieving LED vendor, product and bus names, if applicable; it also performs basic validation of an LED name - update following drivers and their DT bindings to use the new LED registration API: - leds-an30259a, leds-gpio, leds-as3645a, leds-aat1290, leds-cr0014114, leds-lm3601x, leds-lm3692x, leds-lp8860, leds-lt3593, leds-sc27xx-blt Other LED class improvements: - replace {devm_}led_classdev_register() macros with inlines - allow to call led_classdev_unregister() unconditionally - switch to use fwnode instead of be stuck with OF one LED triggers improvements: - led-triggers: - fix dereferencing of null pointer - fix a memory leak bug - ledtrig-gpio: - GPIO 0 is valid Drop superseeded apu2/3 support from leds-apu since for apu2+ a newer, more complete driver exists, based on a generic driver for the AMD SOCs gpio-controller, supporting LEDs as well other devices: - drop profile field from priv data - drop iosize field from priv data - drop enum_apu_led_platform_types - drop superseeded apu2/3 led support - add pr_fmt prefix for better log output - fix error message on probing failure Other misc fixes and improvements to existing LED class drivers: - leds-ns2, leds-max77650: - add of_node_put() before return - leds-pwm, leds-is31fl32xx: - use struct_size() helper - leds-lm3697, leds-lm36274, leds-lm3532: - switch to use fwnode_property_count_uXX() - leds-lm3532: - fix brightness control for i2c mode - change the define for the fs current register - fixes for the driver for stability - add full scale current configuration - dt: Add property for full scale current. - avoid potentially unpaired regulator calls - move static keyword to the front of declarations - fix optional led-max-microamp prop error handling - leds-max77650: - add of_node_put() before return - add MODULE_ALIAS() - Switch to fwnode property API - leds-as3645a: - fix misuse of strlcpy - leds-netxbig: - add of_node_put() in netxbig_leds_get_of_pdata() - remove legacy board-file support - leds-is31fl319x: - simplify getting the adapter of a client - leds-ti-lmu-common: - fix coccinelle issue - move static keyword to the front of declaration - leds-syscon: - use resource managed variant of device register - leds-ktd2692: - fix a typo in the name of a constant - leds-lp5562: - allow firmware files up to the maximum length - leds-an30259a: - fix typo - leds-pca953x: - include the right header" * tag 'leds-for-5.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds: (72 commits) leds: lm3532: Fix optional led-max-microamp prop error handling led: triggers: Fix dereferencing of null pointer leds: ti-lmu-common: Move static keyword to the front of declaration leds: lm3532: Move static keyword to the front of declarations leds: trigger: gpio: GPIO 0 is valid leds: pwm: Use struct_size() helper leds: is31fl32xx: Use struct_size() helper leds: ti-lmu-common: Fix coccinelle issue in TI LMU leds: lm3532: Avoid potentially unpaired regulator calls leds: syscon: Use resource managed variant of device register leds: Replace {devm_}led_classdev_register() macros with inlines leds: Allow to call led_classdev_unregister() unconditionally leds: lm3532: Add full scale current configuration dt: lm3532: Add property for full scale current. leds: lm3532: Fixes for the driver for stability leds: lm3532: Change the define for the fs current register leds: lm3532: Fix brightness control for i2c mode leds: Switch to use fwnode instead of be stuck with OF one leds: max77650: Switch to fwnode property API led: triggers: Fix a memory leak bug ...
2019-09-02Merge 5.3-rc7 into char-misc-nextGreg Kroah-Hartman1-0/+10
We need the fixes in here as well for testing and merges Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-08-28intel_th: pci: Add Tiger Lake supportAlexander Shishkin1-0/+5
This adds support for the Trace Hub in Tiger Lake PCH. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: stable@vger.kernel.org # v4.14+ Link: https://lore.kernel.org/r/20190821074955.3925-5-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-08-28intel_th: pci: Add support for another Lewisburg PCHAlexander Shishkin1-0/+5
Add support for the Trace Hub in another Lewisburg PCH. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: stable@vger.kernel.org # v4.14+ Link: https://lore.kernel.org/r/20190821074955.3925-4-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-08-19Merge 5.3-rc5 into char-misc-nextGreg Kroah-Hartman2-2/+2
We need the char/misc fixes in here as well. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-07-30intel_th: Use the correct style for SPDX License IdentifierNishad Kamdar2-2/+2
This patch corrects the SPDX License Identifier style in header files related to Drivers for Intel(R) Trace Hub controller. For C header files Documentation/process/license-rules.rst mandates C-like comments (opposed to C source files where C++ style should be used) Changes made by using a script provided by Joe Perches here: https://lkml.org/lkml/2019/2/7/46 Suggested-by: Joe Perches <joe@perches.com> Signed-off-by: Nishad Kamdar <nishadkamdar@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-07-30drivers: Introduce device lookup variants by device typeSuzuki K Poulose1-9/+1
Add a helper to match a device by its type and provide wrappers for {bus/class/driver}_find_device() APIs. Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Harald Freudenberger <freude@linux.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: linux-usb@vger.kernel.org Cc: Oliver Neukum <oneukum@suse.com> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Tomas Winkler <tomas.winkler@intel.com> Cc: "Rafael J. Wysocki" <rafael@kernel.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Ulf Hansson <ulf.hansson@linaro.org> Cc: Joe Perches <joe@perches.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Link: https://lore.kernel.org/r/20190723221838.12024-5-suzuki.poulose@arm.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-07-25intel_th: msu: Preserve pre-existing buffer configurationAlexander Shishkin1-2/+7
The MSU configuration registers may contain buffer address/size set by the BIOS or an external hardware debugger, which may want to take over tracing from the driver when the driver is not actively tracing. Preserve these settings when not actively tracing. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20190705141425.19894-6-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-07-25intel_th: msu: Prevent freeing buffers while locked windows existAlexander Shishkin1-0/+5
We already prevent freeing buffers via sysfs interface in case there are existing users or if trace is active. Treat the existence of locked windows similarly and return -EBUSY on attempts to free the buffer. When the last window is unlocked, the freeing will succeed. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20190705141425.19894-5-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-07-25intel_th: msu: Get rid of the window size limitAlexander Shishkin1-71/+68
Currently, the window size is limited to the maximum number of sg entries in one table. This is because the code addresses individual blocks within the window by their numeric index. In reality, though, the blocks most often are iterated through sequentially. By rewriting the logic to use sg pointers instead of block indices we loose the necessity to dereference them directly and gain the ability to use multiple chained tables if necessary. Get rid of the limitation by replacing index-based block accesses with sequential block accesses. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20190705141425.19894-4-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-07-25intel_th: msu-sink: An example msu buffer "sink"Alexander Shishkin2-0/+119
This patch adds an example MSU buffer "sink", which consumes trace data from MSC buffers. Functionally, it acts similarly to "multi" mode with automatic window switching. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20190705141425.19894-3-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-07-25intel_th: msu: Introduce buffer interfaceAlexander Shishkin2-29/+379
Introduces a concept of external buffers, which is a mechanism for creating trace sinks that would receive trace data from MSC buffers and transfer it elsewhere. A external buffer can implement its own window allocation/deallocation if it has to. It must provide a callback that's used to notify it when a window fills up, so that it can then start a DMA transaction from that window 'elsewhere'. This window remains in a 'locked' state and won't be used for storing new trace data until the buffer 'unlocks' it with a provided API call, at which point the window can be used again for storing trace data. This relies on a functional "last block" interrupt, so not all versions of Trace Hub can use this feature, which does not reflect on existing users. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20190705141425.19894-2-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-07-12Merge tag 'driver-core-5.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-coreLinus Torvalds1-3/+2
Pull driver core and debugfs updates from Greg KH: "Here is the "big" driver core and debugfs changes for 5.3-rc1 It's a lot of different patches, all across the tree due to some api changes and lots of debugfs cleanups. Other than the debugfs cleanups, in this set of changes we have: - bus iteration function cleanups - scripts/get_abi.pl tool to display and parse Documentation/ABI entries in a simple way - cleanups to Documenatation/ABI/ entries to make them parse easier due to typos and other minor things - default_attrs use for some ktype users - driver model documentation file conversions to .rst - compressed firmware file loading - deferred probe fixes All of these have been in linux-next for a while, with a bunch of merge issues that Stephen has been patient with me for" * tag 'driver-core-5.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (102 commits) debugfs: make error message a bit more verbose orangefs: fix build warning from debugfs cleanup patch ubifs: fix build warning after debugfs cleanup patch driver: core: Allow subsystems to continue deferring probe drivers: base: cacheinfo: Ensure cpu hotplug work is done before Intel RDT arch_topology: Remove error messages on out-of-memory conditions lib: notifier-error-inject: no need to check return value of debugfs_create functions swiotlb: no need to check return value of debugfs_create functions ceph: no need to check return value of debugfs_create functions sunrpc: no need to check return value of debugfs_create functions ubifs: no need to check return value of debugfs_create functions orangefs: no need to check return value of debugfs_create functions nfsd: no need to check return value of debugfs_create functions lib: 842: no need to check return value of debugfs_create functions debugfs: provide pr_fmt() macro debugfs: log errors when something goes wrong drivers: s390/cio: Fix compilation warning about const qualifiers drivers: Add generic helper to match by of_node driver_find_device: Unify the match function with class_find_device() bus_find_device: Unify the match callback with class_find_device ...
2019-07-03intel_th: msu: Start read iterator from a non-empty windowAlexander Shishkin1-9/+33
In multi-window mode, the read iterator is supposed to start from the window with the oldest data, which is, chronologically, the next window after the one with the newest data. This, however, fails to take into account the potentially empty windows, so in short trace sessions it's possible to have a lot of zeroes read from the character device first. Fix this by skipping over the empty windows in initialization of the read iterator. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20190627125152.54905-5-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-07-03intel_th: msu: Split sgt array and pointer in multiwindow modeAlexander Shishkin1-10/+13
To allow the use of externally allocated SG tables further down the line, change the code to reference the table via a pointer and make it point to the locally allocated table by default. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20190627125152.54905-4-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-07-03intel_th: msu: Support multipage blocksAlexander Shishkin1-18/+38
Now that the MSU is using scatterlist, we can support multipage blocks. At the moment, the code assumes that all blocks are page-sized, but in larger buffers it may make sense to chunk together larger blocks of memory. One place where one-to-many relationship needs to be handled is the MSU buffer's mmap path. Get rid of the implicit assumption that all blocks are page-sized. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20190627125152.54905-3-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-07-03intel_th: pci: Add Ice Lake NNPI supportAlexander Shishkin1-0/+5
This adds Ice Lake NNPI support to the Intel(R) Trace Hub. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: stable <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20190621161930.60785-5-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-07-03intel_th: msu: Fix single mode with disabled IOMMUAlexander Shishkin1-1/+1
Commit 4e0eaf239fb3 ("intel_th: msu: Fix single mode with IOMMU") switched the single mode code to use dma mapping pages obtained from the page allocator, but with IOMMU disabled, that may lead to using SWIOTLB bounce buffers and without additional sync'ing, produces empty trace buffers. Fix this by using a DMA32 GFP flag to the page allocation in single mode, as the device supports full 32-bit DMA addressing. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Fixes: 4e0eaf239fb3 ("intel_th: msu: Fix single mode with IOMMU") Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reported-by: Ammy Yi <ammy.yi@intel.com> Cc: stable <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20190621161930.60785-4-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-07-03intel_th: msu: Remove set but not used variable 'last'YueHaibing1-2/+1
Commit aad14ad3cf3a ("intel_th: msu: Add current window tracking") added the following gcc warning: > drivers/hwtracing/intel_th/msu.c: In function msc_win_switch: > drivers/hwtracing/intel_th/msu.c:1389:21: warning: variable last set but > not used [-Wunused-but-set-variable] Fix it by removing the variable. Signed-off-by: YueHaibing <yuehaibing@huawei.com> Fixes: aad14ad3cf3a ("intel_th: msu: Add current window tracking") Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: stable <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20190621161930.60785-3-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-07-03intel_th: msu: Fix unused variable warning on arm64 platformShaokun Zhang1-13/+27
Commit ba39bd8306057 ("intel_th: msu: Switch over to scatterlist") introduced the following warnings on non-x86 architectures, as a result of reordering the multi mode buffer allocation sequence: > drivers/hwtracing/intel_th/msu.c: In function ‘msc_buffer_win_alloc’: > drivers/hwtracing/intel_th/msu.c:783:21: warning: unused variable ‘i’ > [-Wunused-variable] > int ret = -ENOMEM, i; > ^ > drivers/hwtracing/intel_th/msu.c: In function ‘msc_buffer_win_free’: > drivers/hwtracing/intel_th/msu.c:863:6: warning: unused variable ‘i’ > [-Wunused-variable] > int i; > ^ Fix this compiler warning by factoring out set_memory sequences and making them x86-only. Suggested-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com> Fixes: ba39bd8306057 ("intel_th: msu: Switch over to scatterlist") Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: stable <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20190621161930.60785-2-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-24bus_find_device: Unify the match callback with class_find_deviceSuzuki K Poulose1-3/+2
There is an arbitrary difference between the prototypes of bus_find_device() and class_find_device() preventing their callers from passing the same pair of data and match() arguments to both of them, which is the const qualifier used in the prototype of class_find_device(). If that qualifier is also used in the bus_find_device() prototype, it will be possible to pass the same match() callback function to both bus_find_device() and class_find_device(), which will allow some optimizations to be made in order to avoid code duplication going forward. Also with that, constify the "data" parameter as it is passed as a const to the match function. For this reason, change the prototype of bus_find_device() to match the prototype of class_find_device() and adjust its callers to use the const qualifier in accordance with the new prototype of it. Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andrew Lunn <andrew@lunn.ch> Cc: Andreas Noever <andreas.noever@gmail.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Corey Minyard <minyard@acm.org> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: David Kershner <david.kershner@unisys.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: David Airlie <airlied@linux.ie> Cc: Felipe Balbi <balbi@kernel.org> Cc: Frank Rowand <frowand.list@gmail.com> Cc: Grygorii Strashko <grygorii.strashko@ti.com> Cc: Harald Freudenberger <freude@linux.ibm.com> Cc: Hartmut Knaack <knaack.h@gmx.de> Cc: Heiko Stuebner <heiko@sntech.de> Cc: Jason Gunthorpe <jgg@ziepe.ca> Cc: Jonathan Cameron <jic23@kernel.org> Cc: "James E.J. Bottomley" <jejb@linux.ibm.com> Cc: Len Brown <lenb@kernel.org> Cc: Mark Brown <broonie@kernel.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michael Jamet <michael.jamet@intel.com> Cc: "Martin K. Petersen" <martin.petersen@oracle.com> Cc: Peter Oberparleiter <oberpar@linux.ibm.com> Cc: Sebastian Ott <sebott@linux.ibm.com> Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Cc: Yehezkel Bernat <YehezkelShB@gmail.com> Cc: rafael@kernel.org Acked-by: Corey Minyard <minyard@acm.org> Acked-by: David Kershner <david.kershner@unisys.com> Acked-by: Mark Brown <broonie@kernel.org> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Acked-by: Wolfram Sang <wsa@the-dreams.de> # for the I2C parts Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-21treewide: Add SPDX license identifier - Makefile/KconfigThomas Gleixner1-0/+1
Add SPDX license identifiers to all Make/Kconfig files which: - Have no license information of any form These files fall under the project license, GPL v2 only. The resulting SPDX license identifier is: GPL-2.0-only Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-07Merge tag 'char-misc-5.2-rc1-part2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-miscLinus Torvalds8-173/+599
Pull char/misc update part 2 from Greg KH: "Here is the "real" big set of char/misc driver patches for 5.2-rc1 Loads of different driver subsystem stuff in here, all over the places: - thunderbolt driver updates - habanalabs driver updates - nvmem driver updates - extcon driver updates - intel_th driver updates - mei driver updates - coresight driver updates - soundwire driver cleanups and updates - fastrpc driver updates - other minor driver updates - chardev minor fixups Feels like this tree is getting to be a dumping ground of "small driver subsystems" these days. Which is fine with me, if it makes things easier for those subsystem maintainers. All of these have been in linux-next for a while with no reported issues" * tag 'char-misc-5.2-rc1-part2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (255 commits) intel_th: msu: Add current window tracking intel_th: msu: Add a sysfs attribute to trigger window switch intel_th: msu: Correct the block wrap detection intel_th: Add switch triggering support intel_th: gth: Factor out trace start/stop intel_th: msu: Factor out pipeline draining intel_th: msu: Switch over to scatterlist intel_th: msu: Replace open-coded list_{first,last,next}_entry variants intel_th: Only report useful IRQs to subdevices intel_th: msu: Start handling IRQs intel_th: pci: Use MSI interrupt signalling intel_th: Communicate IRQ via resource intel_th: Add "rtit" source device intel_th: Skip subdevices if their MMIO is missing intel_th: Rework resource passing between glue layers and core intel_th: SPDX-ify the documentation intel_th: msu: Fix single mode with IOMMU coresight: funnel: Support static funnel dt-bindings: arm: coresight: Unify funnel DT binding coresight: replicator: Add new device id for static replicator ...
2019-05-03intel_th: msu: Add current window trackingAlexander Shishkin1-30/+49
Now that we have a way to switch between MSC buffer windows, add code to track the current window. The hardware register NWSA that contains the address of the next window is unfortunately not always usable, and since the driver has full control of the window switching, there is no reason not to keep this on the software side. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-03intel_th: msu: Add a sysfs attribute to trigger window switchAlexander Shishkin1-0/+28
Now that we have the means to trigger a window switch for the MSU trace store, add a sysfs file to allow triggering it from userspace. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-03intel_th: msu: Correct the block wrap detectionAlexander Shishkin1-1/+1
In multi window mode the MSU will set "window wrap" bit to indicate block wrapping as well. Take this into account when checking data blocks. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-03intel_th: Add switch triggering supportAlexander Shishkin4-2/+85
Add support for asserting window switch trigger when tracing to MSU output ports. This allows for software controlled switching between windows of the MSU buffer, which can be used for double buffering while exporting the trace data further from the MSU. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-03intel_th: gth: Factor out trace start/stopAlexander Shishkin1-29/+64
The trace enable/disable functions of the GTH include the code that starts and stops trace flom from the sources. This start/stop functionality will also be used in the window switch trigger sequence. Factor out start/stop code from the larger trace enable/disable code in preparation for the window switch sequence. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-03intel_th: msu: Factor out pipeline drainingAlexander Shishkin3-10/+29
The code that waits for the pipeline empty condition of the MSU is currently called in the path that disables the trace. We will also need this in the window switch trigger sequence. Therefore, factor out this code and make it accessible to the GTH device. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-03intel_th: msu: Switch over to scatterlistAlexander Shishkin1-59/+104
Instead of using a home-grown array of pointers to the DMA pages, switch over to scatterlist data types and accessors, which has all the convenient accessors, can be used to batch-map DMA memory and is convenient for passing around between different layers, which will be useful when MSU buffer management has to cross the boundaries of the MSU driver. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-03intel_th: msu: Replace open-coded list_{first,last,next}_entry variantsAlexander Shishkin1-10/+10
There are a few places in the code where open-coded versions of list entry accessors list_first_entry()/list_last_entry()/list_next_entry() are used. Replace those with the standard macros. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-03intel_th: Only report useful IRQs to subdevicesAlexander Shishkin3-1/+9
The only type of IRQ triggering event that is useful to us at the moment is the "last block" interrupt of the MSU. This interrupt can only be enabled via "MINTCTL" register that doesn't exist in earlier version of the Intel TH. Enumerate the presence of MINTCTL via per-device driver data structure and only instantiate the IRQ resource for subdevices if this capability is present. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-03intel_th: msu: Start handling IRQsAlexander Shishkin4-2/+106
We intend to use the interrupt to detect Last Block condition in the MSU driver, which we can use for double-buffering software-managed data transfers. Add an interrupt handler to the MSU driver. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-03intel_th: pci: Use MSI interrupt signallingAlexander Shishkin2-6/+13
Since Intel TH is capable of MSI interrupt signalling, make use of it. The way it works is, each of the 7 interrupt triggering events has its own vector in this mode, as opposed to interrupt line delivery, where all events are signalled via the same line. Failing to enable MSI, the driver falls back to using an interrupt line. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-03intel_th: Communicate IRQ via resourceAlexander Shishkin4-14/+30
Currently, the IRQ is passed between the glue layers and the core as a separate argument, while the MMIO resources are passed as resources. This also limits the number of IRQs thus used to one, while the current versions of Intel TH use a different MSI vector for each interrupt triggering event, of which there are 7. Change this to pass IRQ in the resources array. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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