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2021-06-21powerpc: Add Microwatt platformPaul Mackerras5-0/+35
Microwatt is a FPGA-based implementation of the Power ISA. It currently only implements little-endian 64-bit mode, and does not (yet) support SMP, VMX, VSX or transactional memory. It has an optional FPU, and an optional MMU (required for running Linux, obviously) which implements a configurable radix tree but not hypervisor mode or nested radix translation. This adds a new machine type to support FPGA-based SoCs with a Microwatt core. CONFIG_MATH_EMULATION can be selected for Microwatt SOCs which don't have the FPU. Signed-off-by: Paul Mackerras <[email protected]> Reviewed-by: Nicholas Piggin <[email protected]> Reviewed-by: Segher Boessenkool <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-06-21powerpc/pesries: Get STF barrier requirement from H_GET_CPU_CHARACTERISTICSNicholas Piggin1-0/+3
This allows the hypervisor / firmware to describe this workarounds to the guest. Signed-off-by: Nicholas Piggin <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-06-21powerpc/pseries: Get entry and uaccess flush required bits from ↵Nicholas Piggin1-0/+6
H_GET_CPU_CHARACTERISTICS This allows the hypervisor / firmware to describe these workarounds to the guest. Signed-off-by: Nicholas Piggin <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-06-20powerpc/pseries/vas: Setup IRQ and fault handlingHaren Myneni1-0/+102
NX generates an interrupt when sees a fault on the user space buffer and the hypervisor forwards that interrupt to OS. Then the kernel handles the interrupt by issuing H_GET_NX_FAULT hcall to retrieve the fault CRB information. This patch also adds changes to setup and free IRQ per each window and also handles the fault by updating the CSB. Signed-off-by: Haren Myneni <[email protected]> Reviewed-by: Nicholas Piggin <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-06-20powerpc/pseries/vas: Integrate API with open/close windowsHaren Myneni2-0/+224
This patch adds VAS window allocatioa/close with the corresponding hcalls. Also changes to integrate with the existing user space VAS API and provide register/unregister functions to NX pseries driver. The driver register function is used to create the user space interface (/dev/crypto/nx-gzip) and unregister to remove this entry. The user space process opens this device node and makes an ioctl to allocate VAS window. The close interface is used to deallocate window. Signed-off-by: Haren Myneni <[email protected]> Reviewed-by: Nicholas Piggin <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-06-20powerpc/pseries/vas: Implement getting capabilities from hypervisorHaren Myneni1-0/+122
The hypervisor provides VAS capabilities for GZIP default and QoS features. These capabilities gives information for the specific features such as total number of credits available in LPAR, maximum credits allowed per window, maximum credits allowed in LPAR, whether usermode copy/paste is supported, and etc. This patch adds the following: - Retrieve all features that are provided by hypervisor using H_QUERY_VAS_CAPABILITIES hcall with 0 as feature type. - Retrieve capabilities for the specific feature using the same hcall and the feature type (1 for QoS and 2 for default type). Signed-off-by: Haren Myneni <[email protected]> Reviewed-by: Nicholas Piggin <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-06-20powerpc/pseries/vas: Add hcall wrappers for VAS handlingHaren Myneni1-0/+147
This patch adds the following hcall wrapper functions to allocate, modify and deallocate VAS windows, and retrieve VAS capabilities. H_ALLOCATE_VAS_WINDOW: Allocate VAS window H_DEALLOCATE_VAS_WINDOW: Close VAS window H_MODIFY_VAS_WINDOW: Setup window before using H_QUERY_VAS_CAPABILITIES: Get VAS capabilities Signed-off-by: Haren Myneni <[email protected]> Reviewed-by: Nicholas Piggin <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-06-20powerpc/pseries/vas: Define VAS/NXGZIP hcalls and structsHaren Myneni1-0/+125
This patch adds hcalls and other definitions. Also define structs that are used in VAS implementation on PowerVM. Signed-off-by: Haren Myneni <[email protected]> Acked-by: Nicholas Piggin <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-06-20powerpc/vas: Define and use common vas_window structHaren Myneni5-124/+132
Many elements in vas_struct are used on PowerNV and PowerVM platforms. vas_window is used for both TX and RX windows on PowerNV and for TX windows on PowerVM. So some elements are specific to these platforms. So this patch defines common vas_window and platform specific window structs (pnv_vas_window on PowerNV). Also adds the corresponding changes in PowerNV vas code. Signed-off-by: Haren Myneni <[email protected]> Reviewed-by: Nicholas Piggin <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-06-20powerpc/vas: Move update_csb/dump_crb to common book3s platformHaren Myneni2-146/+176
If a coprocessor encounters an error translating an address, the VAS will cause an interrupt in the host. The kernel processes the fault by updating CSB. This functionality is same for both powerNV and pseries. So this patch moves these functions to common vas-api.c and the actual functionality is not changed. Signed-off-by: Haren Myneni <[email protected]> Reviewed-by: Nicholas Piggin <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-06-20powerpc/vas: Create take/drop pid and mm reference functionsHaren Myneni4-59/+51
Take pid and mm references when each window opens and drops during close. This functionality is needed for powerNV and pseries. So this patch defines the existing code as functions in common book3s platform vas-api.c Signed-off-by: Haren Myneni <[email protected]> Reviewed-by: Nicholas Piggin <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-06-20powerpc/vas: Add platform specific user window operationsHaren Myneni3-22/+78
PowerNV uses registers to open/close VAS windows, and getting the paste address. Whereas the hypervisor calls are used on PowerVM. This patch adds the platform specific user space window operations and register with the common VAS user space interface. Signed-off-by: Haren Myneni <[email protected]> Reviewed-by: Nicholas Piggin <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-06-20powerpc/powernv/vas: Rename register/unregister functionsHaren Myneni2-2/+18
powerNV and pseries drivers register / unregister to the corresponding platform specific VAS separately. Then these VAS functions call the common API with the specific window operations. So rename powerNV VAS API register/unregister functions. Signed-off-by: Haren Myneni <[email protected]> Reviewed-by: Nicholas Piggin <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-06-20powerpc/vas: Move VAS API to book3s common platformHaren Myneni8-18/+21
The pseries platform will share vas and nx code and interfaces with the PowerNV platform, so create the arch/powerpc/platforms/book3s/ directory and move VAS API code there. Functionality is not changed. Signed-off-by: Haren Myneni <[email protected]> Reviewed-by: Nicholas Piggin <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-06-20powerpc/powernv/vas: Release reference to tgid during window closeHaren Myneni1-4/+5
The kernel handles the NX fault by updating CSB or sending signal to process. In multithread applications, children can open VAS windows and can exit without closing them. But the parent can continue to send NX requests with these windows. To prevent pid reuse, reference will be taken on pid and tgid when the window is opened and release them during window close. The current code is not releasing the tgid reference which can cause pid leak and this patch fixes the issue. Fixes: db1c08a740635 ("powerpc/vas: Take reference to PID and mm for user space windows") Cc: [email protected] # 5.8+ Reported-by: Nicholas Piggin <[email protected]> Signed-off-by: Haren Myneni <[email protected]> Reviewed-by: Nicholas Piggin <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-06-17Merge branch 'topic/ppc-kvm' into nextMichael Ellerman1-44/+8
Merge some powerpc KVM patches from our topic branch. In particular this brings in Nick's big series rewriting parts of the guest entry/exit path in C. Conflicts: arch/powerpc/kernel/security.c arch/powerpc/kvm/book3s_hv_rmhandlers.S
2021-06-17powerpc: Move update_power8_hid0() into its only userChristophe Leroy1-0/+10
update_power8_hid0() is used only by powernv platform subcore.c Move it there. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/37f41d74faa0c66f90b373e243e8b1ee37a1f6fa.1623219019.git.christophe.leroy@csgroup.eu
2021-06-17powerpc/32s: Activate KUAP and KUEP by defaultChristophe Leroy1-2/+2
Now that KUAP and KUEP have been significantly optimised and can be disabled at boot time using 'nosmap' and 'nosmep' kernel parameters, them can be active by default like in other powerpc platforms. It is still possible to disable them completely in the configuration. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/86c7c74a3ba5312daea7e9658b096e2bcc6f4b64.1622708530.git.christophe.leroy@csgroup.eu
2021-06-17powerpc/44x: Implement Kernel Userspace Exec Protection (KUEP)Christophe Leroy1-0/+1
Powerpc 44x has two bits for exec protection in TLBs: one for user (UX) and one for superviser (SX). Clear SX on user pages in TLB miss handlers to provide KUEP. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/169310e08152aa1d96c979770291d165ec6896ae.1622616032.git.christophe.leroy@csgroup.eu
2021-06-17powerpc: Remove CONFIG_PPC_MMU_NOHASH_32Christophe Leroy1-4/+0
Since commit Fixes: 555904d07eef ("powerpc/8xx: MM_SLICE is not needed anymore"), CONFIG_PPC_MMU_NOHASH_32 has not been used. Remove it. Reported-by: Tom Rix <[email protected]> Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/bf1e074f6fb213a1c4cc4964370bdce4b648d647.1622706812.git.christophe.leroy@csgroup.eu
2021-06-17powerpc: Don't use 'struct ppc_inst' to reference instruction locationChristophe Leroy2-4/+4
'struct ppc_inst' is an internal representation of an instruction, but in-memory instructions are and will remain a table of 'u32' forever. Replace all 'struct ppc_inst *' used for locating an instruction in memory by 'u32 *'. This removes a lot of undue casts to 'struct ppc_inst *'. It also helps locating ab-use of 'struct ppc_inst' dereference. Signed-off-by: Christophe Leroy <[email protected]> [mpe: Fix ppc_inst_next(), use u32 instead of unsigned int] Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/7062722b087228e42cbd896e39bfdf526d6a340a.1621516826.git.christophe.leroy@csgroup.eu
2021-06-15powerpc/spider-pci: Remove set but not used variable 'val'Baokun Li1-2/+1
Fixes gcc '-Wunused-but-set-variable' warning: # WARNING: Fixes tag on line 3 doesn't match correct format # WARNING: Fixes tag on line 3 doesn't match correct format # WARNING: Fixes tag on line 3 doesn't match correct format # WARNING: Fixes tag on line 3 doesn't match correct format # WARNING: Fixes tag on line 3 doesn't match correct format # WARNING: Fixes tag on line 3 doesn't match correct format arch/powerpc/platforms/cell/spider-pci.c: In function 'spiderpci_io_flush': arch/powerpc/platforms/cell/spider-pci.c:28:6: warning: variable ‘val’ set but not used [-Wunused-but-set-variable] It never used since introduction. Signed-off-by: Baokun Li <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-06-15powerpc/spufs: Remove set but not used variable 'dummy'Baokun Li1-4/+2
Fixes gcc '-Wunused-but-set-variable' warning: # WARNING: Fixes tag on line 3 doesn't match correct format # WARNING: Fixes tag on line 3 doesn't match correct format # WARNING: Fixes tag on line 3 doesn't match correct format # WARNING: Fixes tag on line 3 doesn't match correct format # WARNING: Fixes tag on line 3 doesn't match correct format arch/powerpc/platforms/cell/spufs/switch.c: In function 'check_ppu_mb_stat': arch/powerpc/platforms/cell/spufs/switch.c:1660:6: warning: variable ‘dummy’ set but not used [-Wunused-but-set-variable] arch/powerpc/platforms/cell/spufs/switch.c: In function 'check_ppuint_mb_stat': arch/powerpc/platforms/cell/spufs/switch.c:1675:6: warning: variable ‘dummy’ set but not used [-Wunused-but-set-variable] It never used since introduction. Signed-off-by: Baokun Li <[email protected]> Acked-by: Arnd Bergmann <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-06-15powerpc/52xx: Add fallthrough in mpc52xx_wdt_ioctl()Tom Rix1-0/+1
With gcc 10.3, there is this compiler error: compiler.h:56:26: error: this statement may fall through mpc52xx_gpt.c:586:2: note: here 586 | case WDIOC_GETTIMEOUT: | ^~~~ So add the fallthrough pseudo keyword. Signed-off-by: Tom Rix <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-06-10KVM: PPC: Book3S HV: remove ISA v3.0 and v3.1 support from P7/8 pathNicholas Piggin1-44/+8
POWER9 and later processors always go via the P9 guest entry path now. Remove the remaining support from the P7/8 path. Signed-off-by: Nicholas Piggin <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-06-10powerpc: Move the use of irq_domain_add_nomap() behind a config optionMarc Zyngier3-0/+3
Only a handful of old PPC systems are still using the old 'nomap' variant of the irqdomain library. Move the associated definitions behind a configuration option, which will allow us to make some more radical changes. Signed-off-by: Marc Zyngier <[email protected]>
2021-06-10powerpc: Convert irq_domain_add_legacy_isa use to irq_domain_add_legacyMarc Zyngier1-2/+2
irq_domain_add_legacy_isa is a pain. It only exists for the benefit of two PPC-specific drivers, and creates an ugly dependency between asm/irq.h and linux/irqdomain.h Instead, let's convert these two drivers to irq_domain_add_legacy(), stop using NUM_ISA_INTERRUPTS by directly setting NR_IRQS_LEGACY. The dependency cannot be broken yet as there is a lot of PPC-related code that depends on it, but that's the first step towards it. A followup patch will remove irq_domain_add_legacy_isa. Signed-off-by: Marc Zyngier <[email protected]>
2021-06-10powerpc: Add missing linux/{of.h,irqdomain.h} include directivesMarc Zyngier4-0/+4
A bunch of PPC files are missing the inclusion of linux/of.h and linux/irqdomain.h, relying on transitive inclusion from another file. As we are about to break this dependency, make sure these dependencies are explicit. Signed-off-by: Marc Zyngier <[email protected]>
2021-06-10powerpc/ps3: Add dma_mask to ps3_dma_regionGeoff Levand1-0/+12
Commit f959dcd6ddfd29235030e8026471ac1b022ad2b0 (dma-direct: Fix potential NULL pointer dereference) added a null check on the dma_mask pointer of the kernel's device structure. Add a dma_mask variable to the ps3_dma_region structure and set the device structure's dma_mask pointer to point to this new variable. Fixes runtime errors like these: # WARNING: Fixes tag on line 10 doesn't match correct format # WARNING: Fixes tag on line 10 doesn't match correct format ps3_system_bus_match:349: dev=8.0(sb_01), drv=8.0(ps3flash): match WARNING: CPU: 0 PID: 1 at kernel/dma/mapping.c:151 .dma_map_page_attrs+0x34/0x1e0 ps3flash sb_01: ps3stor_setup:193: map DMA region failed Signed-off-by: Geoff Levand <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/562d0c9ea0100a30c3b186bcc7adb34b0bbd2cd7.1622746428.git.geoff@infradead.org
2021-06-10powerpc/ps3: Warn on PS3 device errorsGeoff Levand1-4/+5
To aid debugging PS3 boot problems change the log level of several PS3 device errors from pr_debug to pr_warn. Signed-off-by: Geoff Levand <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/eb5c1c10da0bbdeb27c8b069187b4f58e429e837.1622746428.git.geoff@infradead.org
2021-06-10powerpc/ps3: Add CONFIG_PS3_VERBOSE_RESULT optionGeoff Levand1-0/+9
To aid debugging, add a new PS3 kernel config option PS3_VERBOSE_RESULT that, when enabled, will print more verbose messages for the result of LV1 hypercalls. Signed-off-by: Geoff Levand <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/0ce4b6969a08094a747bd382dbfd30b72ebc192d.1622746428.git.geoff@infradead.org
2021-06-10powerpc/ps3: Add firmware version to sysfsGeoff Levand1-3/+40
Add a new sysfs entry /sys/firmware/ps3/fw-version that exports the PS3's firmware version. The firmware version is available through an LV1 hypercall, and we've been printing it to the boot log, but haven't provided an easy way for user utilities to get it. Signed-off-by: Geoff Levand <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/41509b2da647cd34b1331cc4756c8774b1e284eb.1622822173.git.geoff@infradead.org
2021-05-23powerpc/powernv/pci: fix header guardNick Desaulniers1-1/+1
While looking at -Wundef warnings, the #if CONFIG_EEH stood out as a possible candidate to convert to #ifdef CONFIG_EEH. It seems that based on Kconfig dependencies it's not possible to build this file without CONFIG_EEH enabled, but based on upstream discussion, it's not clear yet that CONFIG_EEH should be enabled by default. For now, simply fix the -Wundef warning. Suggested-by: Nathan Chancellor <[email protected]> Suggested-by: Joe Perches <[email protected]> Signed-off-by: Nick Desaulniers <[email protected]> Reviewed-by: Nathan Chancellor <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://github.com/ClangBuiltLinux/linux/issues/570 Link: https://lore.kernel.org/lkml/[email protected]/ Link: https://lore.kernel.org/lkml/CAOSf1CGoN5R0LUrU=Y=UWho1Z_9SLgCX8s3SbFJXwJXc5BYz4A@mail.gmail.com/ Link: https://lore.kernel.org/r/[email protected]
2021-05-23powerpc/pseries: minor enhancements in dlpar_memory_remove_by_ic()Daniel Henrique Barboza1-9/+19
We don't need the 'lmbs_available' variable to count the valid LMBs and to check if we have less than 'lmbs_to_remove'. We must ensure that the entire LMB range must be removed, so we can error out immediately if any LMB in the range is marked as reserved. Add a couple of comments explaining the reasoning behind the differences we have in this function in contrast to what it is done in its sister function, dlpar_memory_remove_by_count(). Signed-off-by: Daniel Henrique Barboza <[email protected]> Reviewed-by: David Gibson <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-05-23powerpc/pseries: break early in dlpar_memory_remove_by_count() loopsDaniel Henrique Barboza1-4/+12
After marking the LMBs as reserved depending on dlpar_remove_lmb() rc, we evaluate whether we need to add the LMBs back or if we can release the LMB DRCs. In both cases, a for_each_drmem_lmb() loop without a break condition is used. This means that we're going to cycle through all LMBs of the partition even after we're done with what we were going to do. This patch adds break conditions in both loops to avoid this. The 'lmbs_removed' variable was renamed to 'lmbs_reserved', and it's now being decremented each time a lmb reservation is removed, indicating that the operation we're doing (adding back LMBs or releasing DRCs) is completed. Signed-off-by: Daniel Henrique Barboza <[email protected]> Reviewed-by: David Gibson <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-05-23powerpc/pseries: check DRCONF_MEM_RESERVED in lmb_is_removable()Daniel Henrique Barboza1-1/+2
DRCONF_MEM_RESERVED is a flag that represents the "Reserved Memory" status in LOPAR v2.10, section 4.2.8. If a LMB is marked as reserved, quoting LOPAR, "is not to be used or altered by the base OS". This flag is read only in the kernel, being set by the firmware/hypervisor in the DT. As an example, QEMU will set this flag in hw/ppc/spapr.c, spapr_dt_dynamic_memory(). lmb_is_removable() does not check for DRCONF_MEM_RESERVED. This function is used in dlpar_remove_lmb() as a guard before the removal logic. Since it is failing to check for !RESERVED, dlpar_remove_lmb() will fail in a later stage instead of failing in the validation when receiving a reserved LMB as input. lmb_is_removable() is also used in dlpar_memory_remove_by_count() to evaluate if we have enough LMBs to complete the request. The missing !RESERVED check in this case is causing dlpar_memory_remove_by_count() to miscalculate the number of elegible LMBs for the removal, and can make it error out later on instead of failing in the validation with the 'not enough LMBs to satisfy request' message. Making a DRCONF_MEM_RESERVED check in lmb_is_removable() fixes all these issues. Signed-off-by: Daniel Henrique Barboza <[email protected]> Reviewed-by: David Gibson <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-05-23powerpc/pseries: Set UNISOLATE on dlpar_memory_remove_by_ic() errorDaniel Henrique Barboza1-0/+7
As previously done in dlpar_cpu_remove() for CPUs, this patch changes dlpar_memory_remove_by_ic() to unisolate the LMB DRC when the LMB is failed to be removed. The hypervisor, seeing a LMB DRC that was supposed to be removed being unisolated instead, can do error recovery on its side. This change is done in dlpar_memory_remove_by_ic() only because, as of today, only QEMU is using this code path for error recovery (via the PSERIES_HP_ELOG_ID_DRC_IC event). phyp treats it as a no-op. Signed-off-by: Daniel Henrique Barboza <[email protected]> Reviewed-by: David Gibson <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-05-23powerpc/pseries/ras: Delete a redundant condition branchZhen Lei1-2/+0
The statement of the last "if (xxx)" branch is the same as the "else" branch. Delete it to simplify code. No functional change. Signed-off-by: Zhen Lei <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-05-23powerpc/pseries/memhotplug: Remove unused inline function dlpar_memory_remove()YueHaibing1-4/+0
dlpar_memory_remove() is never used, so can be removed. Signed-off-by: YueHaibing <[email protected]> Reviewed-by: Daniel Henrique Barboza <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-05-17powerpc: Define NR_CPUS all the timeChristophe Leroy1-3/+3
include/linux/threads.h defines a default value for CONFIG_NR_CPUS but suggests the architectures should always define it. So do it, when CONFIG_SMP is not selected set CONFIG_NR_CPUS to 1. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/afef0ec65a8ba8651bf4f6e4f4f08a8b6991dbfb.1620379469.git.christophe.leroy@csgroup.eu
2021-05-17powerpc/papr_scm: Reduce error severity if nvdimm stats inaccessibleVaibhav Jain1-0/+7
Currently drc_pmem_qeury_stats() generates a dev_err in case "Enable Performance Information Collection" feature is disabled from HMC or performance stats are not available for an nvdimm. The error is of the form below: papr_scm ibm,persistent-memory:ibm,pmemory@44104001: Failed to query performance stats, Err:-10 This error message confuses users as it implies a possible problem with the nvdimm even though its due to a disabled/unavailable feature. We fix this by explicitly handling the H_AUTHORITY and H_UNSUPPORTED errors from the H_SCM_PERFORMANCE_STATS hcall. In case of H_AUTHORITY error an info message is logged instead of an error, saying that "Permission denied while accessing performance stats" and an EPERM error is returned back. In case of H_UNSUPPORTED error we return a EOPNOTSUPP error back from drc_pmem_query_stats() indicating that performance stats-query operation is not supported on this nvdimm. Fixes: 2d02bf835e57 ("powerpc/papr_scm: Fetch nvdimm performance stats from PHYP") Signed-off-by: Vaibhav Jain <[email protected]> Reviewed-by: Ira Weiny <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-05-12powerpc/pseries: warn if recursing into the hcall tracing codeNicholas Piggin1-4/+10
The hcall tracing code has a recursion check built in, which skips tracing if we are already tracing an hcall. However if the tracing code has problems with recursion, this check may not catch all cases because the tracing code could be invoked from a different tracepoint first, then make an hcall that gets traced, then recurse. Add an explicit warning if recursion is detected here, which might help to notice tracing code making hcalls. Really the core trace code should have its own recursion checking and warnings though. Signed-off-by: Nicholas Piggin <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-05-12powerpc/pseries: use notrace hcall variant for H_CEDE idleNicholas Piggin1-10/+0
Rather than special-case H_CEDE in the hcall trace wrappers, make the idle H_CEDE call use plpar_hcall_norets_notrace(). Signed-off-by: Nicholas Piggin <[email protected]> Reviewed-by: Naveen N. Rao <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-05-12powerpc/pseries: Don't trace hcall tracing wrapperNicholas Piggin1-2/+2
This doesn't seem very useful to trace before the recursion check, even if the ftrace code has any recursion checks of its own. Be on the safe side and don't trace the hcall trace wrappers. Reported-by: Naveen N. Rao <[email protected]> Signed-off-by: Nicholas Piggin <[email protected]> Reviewed-by: Naveen N. Rao <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-05-12powerpc/pseries: Fix hcall tracing recursion in pv queued spinlocksNicholas Piggin2-2/+11
The paravit queued spinlock slow path adds itself to the queue then calls pv_wait to wait for the lock to become free. This is implemented by calling H_CONFER to donate cycles. When hcall tracing is enabled, this H_CONFER call can lead to a spin lock being taken in the tracing code, which will result in the lock to be taken again, which will also go to the slow path because it queues behind itself and so won't ever make progress. An example trace of a deadlock: __pv_queued_spin_lock_slowpath trace_clock_global ring_buffer_lock_reserve trace_event_buffer_lock_reserve trace_event_buffer_reserve trace_event_raw_event_hcall_exit __trace_hcall_exit plpar_hcall_norets_trace __pv_queued_spin_lock_slowpath trace_clock_global ring_buffer_lock_reserve trace_event_buffer_lock_reserve trace_event_buffer_reserve trace_event_raw_event_rcu_dyntick rcu_irq_exit irq_exit __do_irq call_do_irq do_IRQ hardware_interrupt_common_virt Fix this by introducing plpar_hcall_norets_notrace(), and using that to make SPLPAR virtual processor dispatching hcalls by the paravirt spinlock code. Signed-off-by: Nicholas Piggin <[email protected]> Reviewed-by: Naveen N. Rao <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-05-08Merge branch 'master' into nextMichael Ellerman2-14/+8
Merge master back into next, this allows us to resolve some conflicts in arch/powerpc/Kconfig, and also re-sort the symbols under config PPC so that they are in alphabetical order again.
2021-05-05Merge branch 'akpm' (patches from Andrew)Linus Torvalds1-11/+5
Merge more updates from Andrew Morton: "The remainder of the main mm/ queue. 143 patches. Subsystems affected by this patch series (all mm): pagecache, hugetlb, userfaultfd, vmscan, compaction, migration, cma, ksm, vmstat, mmap, kconfig, util, memory-hotplug, zswap, zsmalloc, highmem, cleanups, and kfence" * emailed patches from Andrew Morton <[email protected]>: (143 commits) kfence: use power-efficient work queue to run delayed work kfence: maximize allocation wait timeout duration kfence: await for allocation using wait_event kfence: zero guard page after out-of-bounds access mm/process_vm_access.c: remove duplicate include mm/mempool: minor coding style tweaks mm/highmem.c: fix coding style issue btrfs: use memzero_page() instead of open coded kmap pattern iov_iter: lift memzero_page() to highmem.h mm/zsmalloc: use BUG_ON instead of if condition followed by BUG. mm/zswap.c: switch from strlcpy to strscpy arm64/Kconfig: introduce ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE x86/Kconfig: introduce ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE mm,memory_hotplug: add kernel boot option to enable memmap_on_memory acpi,memhotplug: enable MHP_MEMMAP_ON_MEMORY when supported mm,memory_hotplug: allocate memmap from the added memory range mm,memory_hotplug: factor out adjusting present pages into adjust_present_page_count() mm,memory_hotplug: relax fully spanned sections check drivers/base/memory: introduce memory_block_{online,offline} mm/memory_hotplug: remove broken locking of zone PCP structures during hot remove ...
2021-05-05mm: drop redundant ARCH_ENABLE_SPLIT_PMD_PTLOCKAnshuman Khandual1-4/+1
ARCH_ENABLE_SPLIT_PMD_PTLOCKS has duplicate definitions on platforms that subscribe it. Drop these redundant definitions and instead just select it on applicable platforms. Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Anshuman Khandual <[email protected]> Acked-by: Catalin Marinas <[email protected]> [arm64] Acked-by: Heiko Carstens <[email protected]> [s390] Cc: Will Deacon <[email protected]> Cc: Michael Ellerman <[email protected]> Cc: Benjamin Herrenschmidt <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Vasily Gorbik <[email protected]> Cc: Christian Borntraeger <[email protected]> Cc: Yoshinori Sato <[email protected]> Cc: Rich Felker <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: "H. Peter Anvin" <[email protected]> Cc: Albert Ou <[email protected]> Cc: Alexander Viro <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Helge Deller <[email protected]> Cc: "James E.J. Bottomley" <[email protected]> Cc: Palmer Dabbelt <[email protected]> Cc: Paul Walmsley <[email protected]> Cc: Russell King <[email protected]> Cc: Thomas Bogendoerfer <[email protected]> Cc: Vineet Gupta <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2021-05-05mm: drop redundant ARCH_ENABLE_[HUGEPAGE|THP]_MIGRATIONAnshuman Khandual1-4/+1
ARCH_ENABLE_[HUGEPAGE|THP]_MIGRATION configs have duplicate definitions on platforms that subscribe them. Drop these reduntant definitions and instead just select them appropriately. [[email protected]: s/x86_64/X86_64/, per Oscar] Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Anshuman Khandual <[email protected]> Acked-by: Catalin Marinas <[email protected]> [arm64] Cc: Will Deacon <[email protected]> Cc: Michael Ellerman <[email protected]> Cc: Benjamin Herrenschmidt <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: "H. Peter Anvin" <[email protected]> Cc: Albert Ou <[email protected]> Cc: Alexander Viro <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Christian Borntraeger <[email protected]> Cc: Heiko Carstens <[email protected]> Cc: Helge Deller <[email protected]> Cc: "James E.J. Bottomley" <[email protected]> Cc: Palmer Dabbelt <[email protected]> Cc: Paul Walmsley <[email protected]> Cc: Rich Felker <[email protected]> Cc: Russell King <[email protected]> Cc: Thomas Bogendoerfer <[email protected]> Cc: Vasily Gorbik <[email protected]> Cc: Vineet Gupta <[email protected]> Cc: Yoshinori Sato <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2021-05-05mm: generalize SYS_SUPPORTS_HUGETLBFS (rename as ARCH_SUPPORTS_HUGETLBFS)Anshuman Khandual1-3/+3
SYS_SUPPORTS_HUGETLBFS config has duplicate definitions on platforms that subscribe it. Instead, just make it a generic option which can be selected on applicable platforms. Also rename it as ARCH_SUPPORTS_HUGETLBFS instead. This reduces code duplication and makes it cleaner. Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Anshuman Khandual <[email protected]> Acked-by: Catalin Marinas <[email protected]> [arm64] Acked-by: Palmer Dabbelt <[email protected]> [riscv] Acked-by: Michael Ellerman <[email protected]> [powerpc] Cc: Russell King <[email protected]> Cc: Will Deacon <[email protected]> Cc: Thomas Bogendoerfer <[email protected]> Cc: "James E.J. Bottomley" <[email protected]> Cc: Helge Deller <[email protected]> Cc: Benjamin Herrenschmidt <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Paul Walmsley <[email protected]> Cc: Albert Ou <[email protected]> Cc: Yoshinori Sato <[email protected]> Cc: Rich Felker <[email protected]> Cc: Alexander Viro <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Christian Borntraeger <[email protected]> Cc: Heiko Carstens <[email protected]> Cc: "H. Peter Anvin" <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Vasily Gorbik <[email protected]> Cc: Vineet Gupta <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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