- 04 Oct, 2016 40 commits
-
-
Cyril Bur authored
After a thread is reclaimed from its active or suspended transactional state the checkpointed state exists on CPU, this state (along with the live/transactional state) has been saved in its entirety by the reclaiming process. There exists a sequence of events that would cause the kernel to call one of enable_kernel_fp(), enable_kernel_altivec() or enable_kernel_vsx() after a thread has been reclaimed. These functions save away any user state on the CPU so that the kernel can use the registers. Not only is this saving away unnecessary at this point, it is actually incorrect. It causes a save of the checkpointed state to the live structures within the thread struct thus destroying the true live state for that thread. Signed-off-by:
Cyril Bur <cyrilbur@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
-
Cyril Bur authored
msr_check_and_set() always performs a mfmsr() to determine if it needs to perform an mtmsr(), as mfmsr() can be a costly operation msr_check_and_set() could return the MSR now on the CPU to avoid callers of msr_check_and_set having to make their own mfmsr() call. Signed-off-by:
-
Cyril Bur authored
giveup_all() causes FPU/VMX/VSX facilities to be disabled in a threads MSR. If the thread performing the giveup was transactional, the kernel must record which facilities were in use before the giveup as the thread must have these facilities re-enabled on return to userspace. >From process.c: /* * This is called if we are on the way out to userspace and the * TIF_RESTORE_TM flag is set. It checks if we need to reload * FP and/or vector state and does so if necessary. * If userspace is inside a transaction (whether active or * suspended) and FP/VMX/VSX instructions have ever been enabled * inside that transaction, then we have to keep them enabled * and keep the FP/VMX/VSX state loaded while ever the transaction * continues. The reason is that if we didn't, and subsequently * got a FP/VMX/VSX unavailable interrupt inside a transaction, * we don't know whether it's the same transaction, and thus we * don't know which of the checkpointed state and the transactional * state to use. */ Calling check_if_tm_restore_required() will set TIF_RESTORE_TM and save the MSR if needed. Fixes: c2085059 ("powerpc: create giveup_all()") Signed-off-by:
-
Cyril Bur authored
Comment from arch/powerpc/kernel/process.c:967: If userspace is inside a transaction (whether active or suspended) and FP/VMX/VSX instructions have ever been enabled inside that transaction, then we have to keep them enabled and keep the FP/VMX/VSX state loaded while ever the transaction continues. The reason is that if we didn't, and subsequently got a FP/VMX/VSX unavailable interrupt inside a transaction, we don't know whether it's the same transaction, and thus we don't know which of the checkpointed state and the ransactional state to use. restore_math() restore_fp() and restore_altivec() currently may not restore the registers. It doesn't appear that this is more serious than a performance penalty. If the math registers aren't restored the userspace thread will still be run with the facility disabled. Userspace will not be able to read invalid values. On the first access it will take an facility unavailable exception and the kernel will detected an active transaction, at which point it will abort the transaction. There is the possibility for a pathological case preventing any progress by transactions, however, transactions are never guaranteed to make progress. Fixes: 70fe3d98 ("powerpc: Restore FPU/VEC/VSX if previously used") Signed-off-by:
-
Gavin Shan authored
This fixes warning reported from sparse: pci-ioda.c:451:49: warning: incorrect type in argument 2 (different base types) Fixes: 262af557 ("powerpc/powernv: Enable M64 aperatus for PHB3") Signed-off-by:
Gavin Shan <gwshan@linux.vnet.ibm.com> Signed-off-by:
-
Gavin Shan authored
This fixes the warnings reported from sparse: pci.c:312:33: warning: restricted __be64 degrades to integer pci.c:313:33: warning: restricted __be64 degrades to integer Fixes: cee72d5b ("powerpc/powernv: Display diag data on p7ioc EEH errors") Cc: stable@vger.kernel.org # v3.3+ Signed-off-by:
-
Gavin Shan authored
This fixes the warning reported from sparse: eeh-powernv.c:875:23: warning: constant 0x8000000000000000 is so big it is unsigned long Fixes: ebe22531 ("powerpc/powernv: Support PCI slot ID") Suggested-by:
-
Gavin Shan authored
The hub diag-data type is filled with big-endian data by OPAL call opal_pci_get_hub_diag_data(). We need convert it to CPU-endian value before using it. The issue is reported by sparse as pointed by Michael Ellerman: eeh-powernv.c:1309:21: warning: restricted __be16 degrades to integer This converts hub diag-data type to CPU-endian before using it in pnv_eeh_get_and_dump_hub_diag(). Fixes: 2a485ad7 ("powerpc/powernv: Drop PHB operation next_error()") Cc: stable@vger.kernel.org # v4.1+ Suggested-by:
Russell Currey <ruscur@russell.cc> Signed-off-by:
-
Gavin Shan authored
The PE number (@frozen_pe_no), filled by opal_pci_next_error() is in big-endian format. It should be converted to CPU-endian before it is passed to opal_pci_eeh_freeze_clear() when clearing the frozen state if the PE is invalid one. As Michael Ellerman pointed out, the issue is also detected by sparse: eeh-powernv.c:1541:41: warning: incorrect type in argument 2 (different base types) This passes CPU-endian PE number to opal_pci_eeh_freeze_clear() and it should be part of commit <0f36db77> ("powerpc/eeh: Fix wrong printed PE number"), which was merged to 4.3 kernel. Fixes: 71b540ad ("powerpc/powernv: Don't escalate non-existing frozen PE") Cc: stable@vger.kernel.org # v4.3+ Suggested-by:
Paul Mackerras <paulus@samba.org> Signed-off-by:
-
Gavin Shan authored
This replaces of_get_property() with of_property_read_u32() or of_property_read_string() so that we needn't consider the endian issue, the returned value always is in CPU-endian. Signed-off-by:
-
Andrew Donnellan authored
Rewrite the cxl_guest_init_afu() loop in cxl_of_probe() to use for_each_child_of_node() rather than a hand-coded for loop. Remove the useless of_node_put(afu_np) call after the loop, where it's guaranteed that afu_np == NULL. Reported-by:
SF Markus Elfring <elfring@users.sourceforge.net> Reported-by:
Julia Lawall <julia.lawall@lip6.fr> Signed-off-by:
Andrew Donnellan <andrew.donnellan@au1.ibm.com> Reviewed-by:
Frederic Barrat <fbarrat@linux.vnet.ibm.com> Signed-off-by:
-
Frederic Barrat authored
If the capi link is going down while the PSL owns a dirty cache line, any access from the host for that data could lead to an Uncorrectable Error. So when resetting the capi adapter through sysfs, make sure the PSL cache is flushed. It won't help if there are any active Process Elements on the card, as the cache would likely get new dirty cache lines immediately, but if resetting an idle adapter, it should avoid any bad surprises from data left over from terminated Process Elements. Signed-off-by:
Ian Munsie <imunsie@au1.ibm.com> Signed-off-by:
-
Anton Blanchard authored
We supported POWER7 CPUs for bootstrapping little endian, but the target was always POWER8. Now that POWER7 specific issues are impacting performance, change the default target to POWER8. Signed-off-by:
Anton Blanchard <anton@samba.org> Signed-off-by:
-
Anton Blanchard authored
POWER8 handles unaligned accesses in little endian mode, but commit 0b5e6661 ("powerpc: Don't set HAVE_EFFICIENT_UNALIGNED_ACCESS on little endian builds") disabled it for all. The issue with unaligned little endian accesses is specific to POWER7, so update the Kconfig check to match. Using the stat() testcase from commit a75c380c ("powerpc: Enable DCACHE_WORD_ACCESS on ppc64le"), performance improves 15% on POWER8. Signed-off-by:
-
Anton Blanchard authored
I see quite a lot of static branch mispredictions on a simple web serving workload. The issue is in __atomic_add_unless(), called from _atomic_dec_and_lock(). There is no obvious common case, so it is better to let the hardware predict the branch. Signed-off-by:
-
Anton Blanchard authored
During context switch, switch_mm() sets our current CPU in mm_cpumask. We can avoid this atomic sequence in most cases by checking before setting the bit. Testing on a POWER8 using our context switch microbenchmark: tools/testing/selftests/powerpc/benchmarks/context_switch \ --process --no-fp --no-altivec --no-vector Performance improves 2%. Signed-off-by:
Balbir Singh <bsingharora@gmail.com> Signed-off-by:
-
Anton Blanchard authored
No real need for this to be pr_warn(), reduce it to pr_info(). Signed-off-by:
-
Anton Blanchard authored
We are starting to see i40e adapters in recent machines, so enable it in our configs. Signed-off-by:
-
Anton Blanchard authored
Change a few devices and filesystems that are seldom used any more from built in to modules. This reduces our vmlinux about 500kB. Signed-off-by:
-
Anton Blanchard authored
When we issue a system reset, every CPU in the box prints an Oops, including a backtrace. Each of these can be quite large (over 4kB) and we may end up wrapping the ring buffer and losing important information. Bump the base size from 128kB to 256kB and the per CPU size from 4kB to 8kB. Signed-off-by:
-
Anton Blanchard authored
We see big improvements with the VMX crypto functions (often 10x or more), so enable it as a module. Signed-off-by:
-
Anton Blanchard authored
Align the hot loops in our assembly implementation of memset() and backwards_memcpy(). backwards_memcpy() is called from tcp_v4_rcv(), so we might want to optimise this a little more. Signed-off-by:
Nick Piggin <npiggin@gmail.com> Signed-off-by:
-
Nicholas Piggin authored
This was not done before the big patches because I only noticed them afterwards. It has become much easier to see which handlers are branched to from which exception vectors now, and to see exactly what vector space is being used for what. Signed-off-by:
-
Nicholas Piggin authored
Simple substitution. This is possible now that both parts of the OOL initial handler get linked into their correct location. Signed-off-by:
-
Nicholas Piggin authored
This is not an exception handler as such, it's called from local_irq_enable(), not exception entry. Also clean up some now redundant comments at the end of the consolidation series. Signed-off-by:
-
Nicholas Piggin authored
Signed-off-by:
-
Nicholas Piggin authored
Signed-off-by:
-
Nicholas Piggin authored
Signed-off-by:
-
Nicholas Piggin authored
Signed-off-by:
-
Nicholas Piggin authored
Signed-off-by:
-
Nicholas Piggin authored
Signed-off-by:
-
Nicholas Piggin authored
Signed-off-by:
-
Nicholas Piggin authored
Signed-off-by:
-
Nicholas Piggin authored
Signed-off-by:
-
Nicholas Piggin authored
Signed-off-by:
-
Nicholas Piggin authored
Signed-off-by:
-
Nicholas Piggin authored
Signed-off-by:
-
Nicholas Piggin authored
Signed-off-by:
-
Nicholas Piggin authored
Signed-off-by:
-
Nicholas Piggin authored
Signed-off-by:
-
