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2022-02-15perf/smmuv3: Don't cast parameter in bit operationsAndy Shevchenko1-1/+3
While in this particular case it would not be a (critical) issue, the pattern itself is bad and error prone in case somebody blindly copies to their code. Don't cast parameter to unsigned long pointer in the bit operations. Instead copy to a local variable on stack of a proper type and use. Note, new compilers might warn on this line for potential outbound access. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Robin Murphy <robin.murphy@arm.com> Link: https://lore.kernel.org/r/20220209184758.56578-1-andriy.shevchenko@linux.intel.com Signed-off-by: Will Deacon <will@kernel.org>
2022-01-13Merge tag 'irq-msi-2022-01-13' of ↵Linus Torvalds1-4/+1
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull MSI irq updates from Thomas Gleixner: "Rework of the MSI interrupt infrastructure. This is a treewide cleanup and consolidation of MSI interrupt handling in preparation for further changes in this area which are necessary to: - address existing shortcomings in the VFIO area - support the upcoming Interrupt Message Store functionality which decouples the message store from the PCI config/MMIO space" * tag 'irq-msi-2022-01-13' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (94 commits) genirq/msi: Populate sysfs entry only once PCI/MSI: Unbreak pci_irq_get_affinity() genirq/msi: Convert storage to xarray genirq/msi: Simplify sysfs handling genirq/msi: Add abuse prevention comment to msi header genirq/msi: Mop up old interfaces genirq/msi: Convert to new functions genirq/msi: Make interrupt allocation less convoluted platform-msi: Simplify platform device MSI code platform-msi: Let core code handle MSI descriptors bus: fsl-mc-msi: Simplify MSI descriptor handling soc: ti: ti_sci_inta_msi: Remove ti_sci_inta_msi_domain_free_irqs() soc: ti: ti_sci_inta_msi: Rework MSI descriptor allocation NTB/msi: Convert to msi_on_each_desc() PCI: hv: Rework MSI handling powerpc/mpic_u3msi: Use msi_for_each-desc() powerpc/fsl_msi: Use msi_for_each_desc() powerpc/pasemi/msi: Convert to msi_on_each_dec() powerpc/cell/axon_msi: Convert to msi_on_each_desc() powerpc/4xx/hsta: Rework MSI handling ...
2022-01-04perf/smmuv3: Fix unused variable warning when CONFIG_OF=nWill Deacon1-0/+2
The kbuild robot reports that building the SMMUv3 PMU driver with CONFIG_OF=n results in a warning for W=1 builds: >> drivers/perf/arm_smmuv3_pmu.c:889:34: warning: unused variable 'smmu_pmu_of_match' [-Wunused-const-variable] static const struct of_device_id smmu_pmu_of_match[] = { ^ Guard the match table with #ifdef CONFIG_OF. Link: https://lore.kernel.org/r/202201041700.01KZEzhb-lkp@intel.com Fixes: 3f7be4356176 ("perf/smmuv3: Add devicetree support") Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Will Deacon <will@kernel.org>
2021-12-16perf/smmuv3: Use msi_get_virq()Thomas Gleixner1-4/+1
Let the core code fiddle with the MSI descriptor retrieval. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Link: https://lore.kernel.org/r/20211210221815.029143589@linutronix.de
2021-12-14perf/smmuv3: Synthesize IIDR from CoreSight ID registersRobin Murphy1-1/+54
The SMMU_PMCG_IIDR register was not present in older revisions of the Arm SMMUv3 spec. On Arm Ltd. implementations, the IIDR value consists of fields from several PIDR registers, allowing us to present a standardized identifier to userspace. Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> Link: https://lore.kernel.org/r/20211117144844.241072-4-jean-philippe@linaro.org Signed-off-by: Will Deacon <will@kernel.org>
2021-12-14perf/smmuv3: Add devicetree supportJean-Philippe Brucker1-1/+10
Add device-tree support to the SMMUv3 PMCG driver. Signed-off-by: Jay Chen <jkchen@linux.alibaba.com> Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Link: https://lore.kernel.org/r/20211117144844.241072-3-jean-philippe@linaro.org Signed-off-by: Will Deacon <will@kernel.org>
2021-06-11drivers/perf: Simplify EVENT ATTR macro in SMMU PMU driverQi Liu1-5/+2
Use common macro PMU_EVENT_ATTR_ID to simplify SMMU_EVENT_ATTR Cc: Will Deacon <will@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Qi Liu <liuqi115@huawei.com> Link: https://lore.kernel.org/r/1623220863-58233-3-git-send-email-liuqi115@huawei.com Signed-off-by: Will Deacon <will@kernel.org>
2021-06-11perf/smmuv3: Don't trample existing events with global filterRobin Murphy1-8/+10
With global filtering, we only allow an event to be scheduled if its filter settings exactly match those of any existing events, therefore it is pointless to reapply the filter in that case. Much worse, though, is that in doing that we trample the event type of counter 0 if it's already active, and never touch the appropriate PMEVTYPERn so the new event is likely not counting the right thing either. Don't do that. CC: stable@vger.kernel.org Signed-off-by: Robin Murphy <robin.murphy@arm.com> Link: https://lore.kernel.org/r/32c80c0e46237f49ad8da0c9f8864e13c4a803aa.1623153312.git.robin.murphy@arm.com Signed-off-by: Will Deacon <will@kernel.org>
2021-05-24perf/arm-smmuv3: Use irq_set_affinity()Thomas Gleixner1-7/+3
The driver uses irq_set_affinity_hint() to set the affinity for the PMU interrupts, which relies on the undocumented side effect that this function actually sets the affinity under the hood. Setting an hint is clearly not a guarantee and for these PMU interrupts an affinity hint, which is supposed to guide userspace for setting affinity, is beyond pointless, because the affinity of these interrupts cannot be modified from user space. Aside of that the error checks are bogus because the only error which is returned from irq_set_affinity_hint() is when there is no irq descriptor for the interrupt number, but not when the affinity set fails. That's on purpose because the hint can point to an offline CPU. Replace the mindless abuse with irq_set_affinity(). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: linux-arm-kernel@lists.infradead.org Acked-by: Mark Rutland <mark.rutland@arm.com> Link: https://lore.kernel.org/r/20210518093118.603636289@linutronix.de Signed-off-by: Will Deacon <will@kernel.org>
2021-03-25drivers/perf: Simplify the SMMUv3 PMU event attributesQi Liu1-19/+13
For each PMU event, there is a SMMU_EVENT_ATTR(xx, XX) and &smmu_event_attr_xx.attr.attr. Let's redefine the SMMU_EVENT_ATTR to simplify the smmu_pmu_events. Signed-off-by: Qi Liu <liuqi115@huawei.com> Link: https://lore.kernel.org/r/1612789498-12957-1-git-send-email-liuqi115@huawei.com Signed-off-by: Will Deacon <will@kernel.org>
2021-03-25drivers/perf: convert sysfs sprintf family to sysfs_emitQi Liu1-1/+1
sprintf does not know the PAGE_SIZE maximum of the temporary buffer used for sysfs content and it's possible to overrun the buffer length. Use sysfs_emit() function to ensures that no overrun is done. Signed-off-by: Qi Liu <liuqi115@huawei.com> Link: https://lore.kernel.org/r/1616148273-16374-4-git-send-email-liuqi115@huawei.com Signed-off-by: Will Deacon <will@kernel.org>
2021-03-25drivers/perf: convert sysfs snprintf family to sysfs_emitZihao Tang1-1/+1
Fix the following coccicheck warning: ./drivers/perf/hisilicon/hisi_uncore_pmu.c:128:8-16: WARNING: use scnprintf or sprintf. ./drivers/perf/fsl_imx8_ddr_perf.c:173:8-16: WARNING: use scnprintf or sprintf. ./drivers/perf/arm_spe_pmu.c:129:8-16: WARNING: use scnprintf or sprintf. ./drivers/perf/arm_smmu_pmu.c:563:8-16: WARNING: use scnprintf or sprintf. ./drivers/perf/arm_dsu_pmu.c:149:8-16: WARNING: use scnprintf or sprintf. ./drivers/perf/arm_dsu_pmu.c:139:8-16: WARNING: use scnprintf or sprintf. ./drivers/perf/arm-cmn.c:563:8-16: WARNING: use scnprintf or sprintf. ./drivers/perf/arm-cmn.c:351:8-16: WARNING: use scnprintf or sprintf. ./drivers/perf/arm-ccn.c:224:8-16: WARNING: use scnprintf or sprintf. ./drivers/perf/arm-cci.c:708:8-16: WARNING: use scnprintf or sprintf. ./drivers/perf/arm-cci.c:699:8-16: WARNING: use scnprintf or sprintf. ./drivers/perf/arm-cci.c:528:8-16: WARNING: use scnprintf or sprintf. ./drivers/perf/arm-cci.c:309:8-16: WARNING: use scnprintf or sprintf. Signed-off-by: Zihao Tang <tangzihao1@hisilicon.com> Signed-off-by: Qi Liu <liuqi115@huawei.com> Link: https://lore.kernel.org/r/1616148273-16374-2-git-send-email-liuqi115@huawei.com Signed-off-by: Will Deacon <will@kernel.org>
2021-01-20perf: Constify static struct attribute_groupRikard Falkeborn1-4/+4
The only usage is to put their addresses in an array of pointers to const struct attribute group. Make them const to allow the compiler to put them in read-only memory. Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com> Link: https://lore.kernel.org/r/20210117212847.21319-5-rikard.falkeborn@gmail.com Signed-off-by: Will Deacon <will@kernel.org>
2020-11-25perf/smmuv3: Support sysfs identifier fileJohn Garry1-0/+39
SMMU_PMCG_IIDR was added in the SMMUv3.3 spec. For the perf tool to know the specific HW implementation, expose the PMCG_IIDR contents only when set. Signed-off-by: John Garry <john.garry@huawei.com> Link: https://lore.kernel.org/r/1602149181-237415-5-git-send-email-john.garry@huawei.com Signed-off-by: Will Deacon <will@kernel.org>
2020-08-03Merge tag 'arm64-upstream' of ↵Linus Torvalds1-2/+1
git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux Pull arm64 and cross-arch updates from Catalin Marinas: "Here's a slightly wider-spread set of updates for 5.9. Going outside the usual arch/arm64/ area is the removal of read_barrier_depends() series from Will and the MSI/IOMMU ID translation series from Lorenzo. The notable arm64 updates include ARMv8.4 TLBI range operations and translation level hint, time namespace support, and perf. Summary: - Removal of the tremendously unpopular read_barrier_depends() barrier, which is a NOP on all architectures apart from Alpha, in favour of allowing architectures to override READ_ONCE() and do whatever dance they need to do to ensure address dependencies provide LOAD -> LOAD/STORE ordering. This work also offers a potential solution if compilers are shown to convert LOAD -> LOAD address dependencies into control dependencies (e.g. under LTO), as weakly ordered architectures will effectively be able to upgrade READ_ONCE() to smp_load_acquire(). The latter case is not used yet, but will be discussed further at LPC. - Make the MSI/IOMMU input/output ID translation PCI agnostic, augment the MSI/IOMMU ACPI/OF ID mapping APIs to accept an input ID bus-specific parameter and apply the resulting changes to the device ID space provided by the Freescale FSL bus. - arm64 support for TLBI range operations and translation table level hints (part of the ARMv8.4 architecture version). - Time namespace support for arm64. - Export the virtual and physical address sizes in vmcoreinfo for makedumpfile and crash utilities. - CPU feature handling cleanups and checks for programmer errors (overlapping bit-fields). - ACPI updates for arm64: disallow AML accesses to EFI code regions and kernel memory. - perf updates for arm64. - Miscellaneous fixes and cleanups, most notably PLT counting optimisation for module loading, recordmcount fix to ignore relocations other than R_AARCH64_CALL26, CMA areas reserved for gigantic pages on 16K and 64K configurations. - Trivial typos, duplicate words" Link: http://lkml.kernel.org/r/20200710165203.31284-1-will@kernel.org Link: http://lkml.kernel.org/r/20200619082013.13661-1-lorenzo.pieralisi@arm.com * tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (82 commits) arm64: use IRQ_STACK_SIZE instead of THREAD_SIZE for irq stack arm64/mm: save memory access in check_and_switch_context() fast switch path arm64: sigcontext.h: delete duplicated word arm64: ptrace.h: delete duplicated word arm64: pgtable-hwdef.h: delete duplicated words bus: fsl-mc: Add ACPI support for fsl-mc bus/fsl-mc: Refactor the MSI domain creation in the DPRC driver of/irq: Make of_msi_map_rid() PCI bus agnostic of/irq: make of_msi_map_get_device_domain() bus agnostic dt-bindings: arm: fsl: Add msi-map device-tree binding for fsl-mc bus of/device: Add input id to of_dma_configure() of/iommu: Make of_map_rid() PCI agnostic ACPI/IORT: Add an input ID to acpi_dma_configure() ACPI/IORT: Remove useless PCI bus walk ACPI/IORT: Make iort_msi_map_rid() PCI agnostic ACPI/IORT: Make iort_get_device_domain IRQ domain agnostic ACPI/IORT: Make iort_match_node_callback walk the ACPI namespace for NC arm64: enable time namespace support arm64/vdso: Restrict splitting VVAR VMA arm64/vdso: Handle faults on timens page ...
2020-07-17drivers/perf: Prevent forced unbinding of PMU driversQi Liu1-0/+1
Forcefully unbinding PMU drivers during perf sampling will lead to a kernel panic, because the perf upper-layer framework call a NULL pointer in this situation. To solve this issue, "suppress_bind_attrs" should be set to true, so that bind/unbind can be disabled via sysfs and prevent unbinding PMU drivers during perf sampling. Signed-off-by: Qi Liu <liuqi115@huawei.com> Reviewed-by: John Garry <john.garry@huawei.com> Link: https://lore.kernel.org/r/1594975763-32966-1-git-send-email-liuqi115@huawei.com Signed-off-by: Will Deacon <will@kernel.org>
2020-07-16drivers/perf: Fix kernel panic when rmmod PMU modules during perf samplingQi Liu1-0/+1
When users try to remove PMU modules during perf sampling, kernel panic will happen because the pmu->read() is a NULL pointer here. INFO on HiSilicon hip08 platform as follow: pc : hisi_uncore_pmu_event_update+0x30/0xa4 [hisi_uncore_pmu] lr : hisi_uncore_pmu_read+0x20/0x2c [hisi_uncore_pmu] sp : ffff800010103e90 x29: ffff800010103e90 x28: ffff0027db0c0e40 x27: ffffa29a76f129d8 x26: ffffa29a77ceb000 x25: ffffa29a773a5000 x24: ffffa29a77392000 x23: ffffddffe5943f08 x22: ffff002784285960 x21: ffff002784285800 x20: ffff0027d2e76c80 x19: ffff0027842859e0 x18: ffff80003498bcc8 x17: ffffa29a76afe910 x16: ffffa29a7583f530 x15: 16151a1512061a1e x14: 0000000000000000 x13: ffffa29a76f1e238 x12: 0000000000000001 x11: 0000000000000400 x10: 00000000000009f0 x9 : ffff8000107b3e70 x8 : ffff0027db0c1890 x7 : ffffa29a773a7000 x6 : 00000007f5131013 x5 : 00000007f5131013 x4 : 09f257d417c00000 x3 : 00000002187bd7ce x2 : ffffa29a38f0f0d8 x1 : ffffa29a38eae268 x0 : ffff0027d2e76c80 Call trace: hisi_uncore_pmu_event_update+0x30/0xa4 [hisi_uncore_pmu] hisi_uncore_pmu_read+0x20/0x2c [hisi_uncore_pmu] __perf_event_read+0x1a0/0x1f8 flush_smp_call_function_queue+0xa0/0x160 generic_smp_call_function_single_interrupt+0x18/0x20 handle_IPI+0x31c/0x4dc gic_handle_irq+0x2c8/0x310 el1_irq+0xcc/0x180 arch_cpu_idle+0x4c/0x20c default_idle_call+0x20/0x30 do_idle+0x1b4/0x270 cpu_startup_entry+0x28/0x30 secondary_start_kernel+0x1a4/0x1fc To solve the above issue, current module should be registered to kernel, so that try_module_get() can be invoked when perf sampling starts. This adds the reference counting of module and could prevent users from removing modules during sampling. Reported-by: Haifeng Wang <wang.wanghaifeng@huawei.com> Signed-off-by: Qi Liu <liuqi115@huawei.com> Reviewed-by: John Garry <john.garry@huawei.com> Link: https://lore.kernel.org/r/1594891165-8228-1-git-send-email-liuqi115@huawei.com Signed-off-by: Will Deacon <will@kernel.org>
2020-07-13perf/smmuv3: To simplify code for ioremap page in pmcgJay Chen1-2/+1
Use the devm_platform_get_and_ioremap_resource to simplify the code a bit. Signed-off-by: Jay Chen <jkchen@linux.alibaba.com> Link: https://lore.kernel.org/r/20200706112246.92220-2-jkchen@linux.alibaba.com Signed-off-by: Will Deacon <will@kernel.org>
2020-05-18pmu/smmuv3: Clear IRQ affinity hint on device removalJean-Philippe Brucker1-1/+4
Currently when trying to remove the SMMUv3 PMU module we get a WARN_ON_ONCE from free_irq(), because the affinity hint set during probe hasn't been properly cleared. [ 238.878383] WARNING: CPU: 0 PID: 175 at kernel/irq/manage.c:1744 free_irq+0x324/0x358 ... [ 238.897263] Call trace: [ 238.897998] free_irq+0x324/0x358 [ 238.898792] devm_irq_release+0x18/0x28 [ 238.899189] release_nodes+0x1b0/0x228 [ 238.899984] devres_release_all+0x38/0x60 [ 238.900779] device_release_driver_internal+0x10c/0x1d0 [ 238.901574] driver_detach+0x50/0xe0 [ 238.902368] bus_remove_driver+0x5c/0xd8 [ 238.903448] driver_unregister+0x30/0x60 [ 238.903958] platform_driver_unregister+0x14/0x20 [ 238.905075] arm_smmu_pmu_exit+0x1c/0xecc [arm_smmuv3_pmu] [ 238.905547] __arm64_sys_delete_module+0x14c/0x260 [ 238.906342] el0_svc_common.constprop.0+0x74/0x178 [ 238.907355] do_el0_svc+0x24/0x90 [ 238.907932] el0_sync_handler+0x11c/0x198 [ 238.908979] el0_sync+0x158/0x180 Just like the other perf drivers, clear the affinity hint before releasing the device. Fixes: 7d839b4b9e00 ("perf/smmuv3: Add arm64 smmuv3 pmu driver") Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> Link: https://lore.kernel.org/r/20200422084805.237738-1-jean-philippe@linaro.org Signed-off-by: Will Deacon <will@kernel.org>
2020-02-10perf/smmuv3: Use platform_get_irq_optional() for wired interruptJohn Garry1-1/+1
Even though a SMMUv3 PMCG implementation may use an MSI as the form of interrupt source, the kernel would still complain that it does not find the wired (GSIV) interrupt in this case: root@(none)$ dmesg | grep arm-smmu-v3-pmcg | grep "not found" [ 59.237219] arm-smmu-v3-pmcg arm-smmu-v3-pmcg.8.auto: IRQ index 0 not found [ 59.322841] arm-smmu-v3-pmcg arm-smmu-v3-pmcg.9.auto: IRQ index 0 not found [ 59.422155] arm-smmu-v3-pmcg arm-smmu-v3-pmcg.10.auto: IRQ index 0 not found [ 59.539014] arm-smmu-v3-pmcg arm-smmu-v3-pmcg.11.auto: IRQ index 0 not found [ 59.640329] arm-smmu-v3-pmcg arm-smmu-v3-pmcg.12.auto: IRQ index 0 not found [ 59.743112] arm-smmu-v3-pmcg arm-smmu-v3-pmcg.13.auto: IRQ index 0 not found [ 59.880577] arm-smmu-v3-pmcg arm-smmu-v3-pmcg.14.auto: IRQ index 0 not found [ 60.017528] arm-smmu-v3-pmcg arm-smmu-v3-pmcg.15.auto: IRQ index 0 not found Use platform_get_irq_optional() to silence the warning. If neither interrupt source is found, then the driver will still warn that IRQ setup errored and the probe will fail. Reviewed-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: John Garry <john.garry@huawei.com> Signed-off-by: Will Deacon <will@kernel.org>
2019-12-18perf/smmuv3: Remove the leftover put_cpu() in error pathHanjun Guo1-3/+1
In smmu_pmu_probe(), there is put_cpu() in the error path, which is wrong because we use raw_smp_processor_id() to get the cpu ID, not get_cpu(), remove it. While we are at it, kill 'out_cpuhp_err' altogether and just return err if we fail to add the hotplug instance. Acked-by: Robin Murphy <robin.murphy@arm.com> Acked-by: Will Deacon <will@kernel.org> Signed-off-by: Hanjun Guo <guohanjun@huawei.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2019-10-01perf/smmuv3: use devm_platform_ioremap_resource() to simplify codeYueHaibing1-3/+2
Use devm_platform_ioremap_resource() to simplify the code a bit. This is detected by coccinelle. Signed-off-by: YueHaibing <yuehaibing@huawei.com> Signed-off-by: Will Deacon <will@kernel.org>
2019-08-27perf/smmuv3: Validate groups for global filteringRobin Murphy1-13/+34
With global filtering, it becomes possible for users to construct self-contradictory groups with conflicting filters. Make sure we cover that when initially validating events. Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Will Deacon <will@kernel.org>
2019-08-27perf/smmuv3: Validate group sizeRobin Murphy1-8/+14
Ensure that a group will actually fit into the available counters. Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Will Deacon <will@kernel.org>
2019-04-04perf/smmuv3: Enable HiSilicon Erratum 162001800 quirkShameer Kolothum1-7/+41
HiSilicon erratum 162001800 describes the limitation of SMMUv3 PMCG implementation on HiSilicon Hip08 platforms. On these platforms, the PMCG event counter registers (SMMU_PMCG_EVCNTRn) are read only and as a result it is not possible to set the initial counter period value on event monitor start. To work around this, the current value of the counter is read and used for delta calculations. OEM information from ACPI header is used to identify the affected hardware platforms. Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com> Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org> Reviewed-by: Robin Murphy <robin.murphy@arm.com> Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> [will: update silicon-errata.txt and add reason string to acpi match] Signed-off-by: Will Deacon <will.deacon@arm.com>
2019-04-04perf/smmuv3: Add MSI irq supportShameer Kolothum1-0/+58
This adds support for MSI-based counter overflow interrupt. Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com> Reviewed-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
2019-04-04perf/smmuv3: Add arm64 smmuv3 pmu driverNeil Leeder1-0/+773
Adds a new driver to support the SMMUv3 PMU and add it into the perf events framework. Each SMMU node may have multiple PMUs associated with it, each of which may support different events. SMMUv3 PMCG devices are named as smmuv3_pmcg_<phys_addr_page> where <phys_addr_page> is the physical page address of the SMMU PMCG wrapped to 4K boundary. For example, the PMCG at 0xff88840000 is named smmuv3_pmcg_ff88840 Filtering by stream id is done by specifying filtering parameters with the event. options are: filter_enable - 0 = no filtering, 1 = filtering enabled filter_span - 0 = exact match, 1 = pattern match filter_stream_id - pattern to filter against Example: perf stat -e smmuv3_pmcg_ff88840/transaction,filter_enable=1, filter_span=1,filter_stream_id=0x42/ -a netperf Applies filter pattern 0x42 to transaction events, which means events matching stream ids 0x42 & 0x43 are counted as only upper StreamID bits are required to match the given filter. Further filtering information is available in the SMMU documentation. SMMU events are not attributable to a CPU, so task mode and sampling are not supported. Signed-off-by: Neil Leeder <nleeder@codeaurora.org> Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com> Reviewed-by: Robin Murphy <robin.murphy@arm.com> [will: fold in review feedback from Robin] [will: rewrite Kconfig text and allow building as a module] Signed-off-by: Will Deacon <will.deacon@arm.com>
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