- 03 Jul, 2019 18 commits
-
-
Krzysztof Kozlowski authored
Remove the CONFIG_UEVENT_HELPER_PATH because: 1. It is disabled since commit 1be01d4a ("driver: base: Disable CONFIG_UEVENT_HELPER by default") as its dependency (UEVENT_HELPER) was made default to 'n', 2. It is not recommended (help message: "This should not be used today [...] creates a high system load") and was kept only for ancient userland, 3. Certain userland specifically requests it to be disabled (systemd README: "Legacy hotplug slows down the system and confuses udev"). Signed-off-by:
Krzysztof Kozlowski <krzk@kernel.org> Acked-by:
Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Christian Lamparter authored
When testing out gpio-keys with a button, a spurious interrupt (and therefore a key press or release event) gets triggered as soon as the driver enables the irq line for the first time. This patch clears any potential bogus generated interrupt that was caused by the switching of the associated irq's type and polarity. Signed-off-by:
Christian Lamparter <chunkeey@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Geert Uytterhoeven authored
"git diff" says: \ No newline at end of file after modifying the file. Signed-off-by:
Geert Uytterhoeven <geert+renesas@glider.be> [mpe: Rebase since addition of another test] Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Suraj Jitindar Singh authored
Commit ddf35cf3 ("powerpc: Use barrier_nospec in copy_from_user()") Added barrier_nospec before loading from user-controlled pointers. The intention was to order the load from the potentially user-controlled pointer vs a previous branch based on an access_ok() check or similar. In order to achieve the same result, add a barrier_nospec to the raw_copy_in_user() function before loading from such a user-controlled pointer. Fixes: ddf35cf3 ("powerpc: Use barrier_nospec in copy_from_user()") Signed-off-by:
Suraj Jitindar Singh <sjitindarsingh@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Michael Neuling authored
When emulating tsr, treclaim and trechkpt, we incorrectly set CR0. The code currently sets: CR0 <- 00 || MSR[TS] but according to the ISA it should be: CR0 <- 0 || MSR[TS] || 0 This fixes the bit shift to put the bits in the correct location. This is a data integrity issue as CR0 is corrupted. Fixes: 4bb3c7a0 ("KVM: PPC: Book3S HV: Work around transactional memory bugs in POWER9") Cc: stable@vger.kernel.org # v4.17+ Tested-by:
Suraj Jitindar Singh <sjitindarsingh@gmail.com> Signed-off-by:
Michael Neuling <mikey@neuling.org> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Alexey Kardashevskiy authored
The powernv platform uses @dma_iommu_ops for non-bypass DMA. These ops need an iommu_table pointer which is stored in dev->archdata.iommu_table_base. It is initialized during pcibios_setup_device() which handles boot time devices. However when a device is taken from the system in order to pass it through, the default IOMMU table is destroyed but the pointer in a device is not updated; also when a device is returned back to the system, a new table pointer is not stored in dev->archdata.iommu_table_base either. So when a just returned device tries using IOMMU, it crashes on accessing stale iommu_table or its members. This calls set_iommu_table_base() when the default window is created. Note it used to be there before but was wrongly removed (see "fixes"). It did not appear before as these days most devices simply use bypass. This adds set_iommu_table_base(NULL) when a device is taken from the system to make it clear that IOMMU DMA cannot be used past that point. Fixes: c4e9d3c1 ("powerpc/powernv/pseries: Rework device adding to IOMMU groups") Cc: stable@vger.kernel.org # v5.0+ Signed-off-by:
Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Alexey Kardashevskiy authored
The pseries platform uses the PCI_PROBE_DEVTREE method of PCI probing which reads "assigned-addresses" of every PCI device and initializes the device resources. However if the property is missing or zero sized, then there is no fallback of any kind and the PCI resources remain undiscovered, i.e. pdev->resource[] array remains empty. This adds a fallback which parses the "reg" property in pretty much same way except it marks resources as "unset" which later make Linux assign those resources proper addresses. This has an effect when: 1. a hypervisor failed to assign any resource for a device; 2. /chosen/linux,pci-probe-only=0 is in the DT so the system may try assigning a resource. Neither is likely to happen under PowerVM. Signed-off-by:
Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Alexey Kardashevskiy authored
So far the pseries platforms has always been using IOMMU making SWIOTLB unnecessary. Now we want secure guests which means devices can only access certain areas of guest physical memory; we are going to use SWIOTLB for this purpose. This allows SWIOTLB for pseries. By default there is no change in behavior. This enables SWIOTLB when the "swiotlb" kernel parameter is set to "force". With the SWIOTLB enabled, the kernel creates a directly mapped DMA window (using the usual DDW mechanism) and implements SWIOTLB on top of that. Signed-off-by:
Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Alexey Kardashevskiy authored
The commit 8617a5c5 ("powerpc/dma: handle iommu bypass in dma_iommu_ops") merged direct DMA ops into the IOMMU DMA ops allowing SWIOTLB as well but only for mapping; the unmapping and bouncing parts were left unmodified. This adds missing direct unmapping calls to .unmap_page() and .unmap_sg(). This adds missing sync callbacks and directs them to the direct DMA hooks. Fixes: 8617a5c5 ("powerpc/dma: handle iommu bypass in dma_iommu_ops") Signed-off-by:
Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by:
Thiago Jung Bauermann <bauerman@linux.ibm.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Christoph Hellwig authored
Use the dma_get_mask() helper from dma-mapping.h instead, as they are functionally identical. Signed-off-by:
Christoph Hellwig <hch@lst.de> Reviewed-by:
Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Michael Neuling authored
If you compile with KVM but without CONFIG_HAVE_HW_BREAKPOINT you fail at linking with: arch/powerpc/kvm/book3s_hv_rmhandlers.o:(.text+0x708): undefined reference to `dawr_force_enable' This was caused by commit c1fe190c ("powerpc: Add force enable of DAWR on P9 option"). This moves a bunch of code around to fix this. It moves a lot of the DAWR code in a new file and creates a new CONFIG_PPC_DAWR to enable compiling it. Fixes: c1fe190c ("powerpc: Add force enable of DAWR on P9 option") Signed-off-by:
Michael Neuling <mikey@neuling.org> [mpe: Minor formatting in set_dawr()] Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Mathieu Malaterre authored
In commit c1fe190c ("powerpc: Add force enable of DAWR on P9 option") the following piece of code was added: smp_call_function((smp_call_func_t)set_dawr, &null_brk, 0); Since GCC 8 this triggers the following warning about incompatible function types: arch/powerpc/kernel/hw_breakpoint.c:408:21: error: cast between incompatible function types from 'int (*)(struct arch_hw_breakpoint *)' to 'void (*)(void *)' [-Werror=cast-function-type] Since the warning is there for a reason, and should not be hidden behind a cast, provide an intermediate callback function to avoid the warning. Fixes: c1fe190c ("powerpc: Add force enable of DAWR on P9 option") Suggested-by:
Christoph Hellwig <hch@infradead.org> Signed-off-by:
Mathieu Malaterre <malat@debian.org> Signed-off-by:
Michael Neuling <mikey@neuling.org> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
ISA v3.0 radix modes provide SLBIA variants which can invalidate ERAT for effPID!=0 or for effLPID!=0, which allows user and guest invalidations to retain kernel/host ERAT entries. Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
This makes it clear to the caller that it can only be used on POWER9 and later CPUs. Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> [mpe: Use "ISA_3_0" rather than "ARCH_300"] Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
Branch to the relocated 0xc000 address early (still in real mode), to simplify subsequent branches. Have the virt mode handler avoid just 'windup' and redo the exception from scratch, rather than branching back to the trampoline. Rearrange the stack setup instruction location to match the system reset handler (e.g., right before EXCEPTION_PROLOG_COMMON). Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
No code change. Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
Follow convention and move tramp ahead of common. Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
The idle wake up code in the system reset interrupt is not very optimal. There are two requirements: perform idle wake up quickly; and save everything including CFAR for non-idle interrupts, with no performance requirement. The problem with placing the idle test in the middle of the handler and using the normal handler code to save CFAR, is that it's quite costly (e.g., mfcfar is serialising, speculative workarounds get applied, SRR1 has to be reloaded, etc). It also prevents the standard interrupt handler boilerplate being used. This pain can be avoided by using a dedicated idle interrupt handler at the start of the interrupt handler, which restores all registers back to the way they were in case it was not an idle wake up. CFAR is preserved without saving it before the non-idle case by making that the fall-through, and idle is a taken branch. Performance seems to be in the noise, but possibly around 0.5% faster, the executed instructions certainly look better. The bigger benefit is being able to drop in standard interrupt handlers after the idle code, which helps with subsequent cleanup and consolidation. Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> [mpe: Fixup BE by using DOTSYM for idle_return_gpr_loss call] Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
- 02 Jul, 2019 22 commits
-
-
Nicholas Piggin authored
The bad stack test in interrupt handlers has a few problems. For performance it is taken in the common case, which is a fetch bubble and a waste of i-cache. For code development and maintainence, it requires yet another stack frame setup routine, and that constrains all exception handlers to follow the same register save pattern which inhibits future optimisation. Remove the test/branch and replace it with a trap. Teach the program check handler to use the emergency stack for this case. This does not result in quite so nice a message, however the SRR0 and SRR1 of the crashed interrupt can be seen in r11 and r12, as is the original r1 (adjusted by INT_FRAME_SIZE). These are the most important parts to debugging the issue. The original r9-12 and cr0 is lost, which is the main downside. kernel BUG at linux/arch/powerpc/kernel/exceptions-64s.S:847! Oops: Exception in kernel mode, sig: 5 [#1] BE SMP NR_CPUS=2048 NUMA PowerNV Modules linked in: CPU: 0 PID: 1 Comm: swapper/0 Not tainted NIP: c000000000009108 LR: c000000000cadbcc CTR: c0000000000090f0 REGS: c0000000fffcbd70 TRAP: 0700 Not tainted MSR: 9000000000021032 <SF,HV,ME,IR,DR,RI> CR: 28222448 XER: 20040000 CFAR: c000000000009100 IRQMASK: 0 GPR00: 000000000000003d fffffffffffffd00 c0000000018cfb00 c0000000f02b3166 GPR04: fffffffffffffffd 0000000000000007 fffffffffffffffb 0000000000000030 GPR08: 0000000000000037 0000000028222448 0000000000000000 c000000000ca8de0 GPR12: 9000000002009032 c000000001ae0000 c000000000010a00 0000000000000000 GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR20: c0000000f00322c0 c000000000f85200 0000000000000004 ffffffffffffffff GPR24: fffffffffffffffe 0000000000000000 0000000000000000 000000000000000a GPR28: 0000000000000000 0000000000000000 c0000000f02b391c c0000000f02b3167 NIP [c000000000009108] decrementer_common+0x18/0x160 LR [c000000000cadbcc] .vsnprintf+0x3ec/0x4f0 Call Trace: Instruction dump: 996d098a 994d098b 38610070 480246ed 48005518 60000000 38200000 718a4000 7c2a0b78 3821fd00 41c20008 e82d0970 <0981fd00> f92101a0 f9610170 f9810178 Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
Since the system reset interrupt began to use its own stack, and machine check interrupts have done so for some time, r1 can be changed without clearing MSR[RI], provided no other interrupts (including SLB misses) are taken. MSR[RI] does have to be cleared when using SCRATCH0, however. Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
No generated code change. Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
Although the 0x1500 interrupt only applies to bare metal, it is better to just use the standard macro for scratch save. Runtime code path remains unchanged (due to instruction patching). Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
Some exception entry requires DAR and/or DSISR to be saved into the paca exception save area. Add options to the standard exception macros for these. Generated code changes slightly due to code structure. - 554: a6 02 72 7d mfdsisr r11 - 558: a8 00 4d f9 std r10,168(r13) - 55c: b0 00 6d 91 stw r11,176(r13) + 554: a8 00 4d f9 std r10,168(r13) + 558: a6 02 52 7d mfdsisr r10 + 55c: b0 00 4d 91 stw r10,176(r13) Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
No generated code change. Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
Restore all SPRs and CR up-front, these are longer latency instructions. Move register restore around to maximise pairs of adjacent loads (e.g., restore r0 next to r1). Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
Duplicate the hmi windup code for both cases, rather than to put a special case branch in the middle of it. Remove unused label. This helps with later code consolidation. Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
Move in_mce decrement earlier before registers are restored (but still after RI=0). This helps with later consolidation. Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
Trivial code change, r3->r9. Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
All supported 64s CPUs support mtmsrd L=1 instruction, so a cleanup can be made in sreset and mce handlers. Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
Move SPR reads ahead of writes. Real mode entry that is not a KVM guest is rare these days, but bad practice propagates. Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
syscall / hcall entry unnecessarily differs between KVM and non-KVM builds. Move the SMT priority instruction to the same location (after INTERRUPT_TO_KERNEL). Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
No generated code change. Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
No generated code change. Final vmlinux is changed only due to change in bug table line numbers. Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
No generated code change. Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
Generally, macros that result in instructions being expanded are indented by a tab, and those that don't have no indent. Fix the obvious cases that go contrary to style. No generated code change. Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
No generated code change. Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
No generated code change. Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Nicholas Piggin authored
No generated code change. Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-