- 09 Mar, 2016 2 commits
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Christophe Lombard authored
Move around some functions which will be accessed from the bare-metal and guest environments. Code in native.c and pci.c is meant to be bare-metal specific. Other files contain code which may be shared with guests. Co-authored-by:
Frederic Barrat <fbarrat@linux.vnet.ibm.com> Signed-off-by:
Christophe Lombard <clombard@linux.vnet.ibm.com> Reviewed-by:
Manoj Kumar <manoj@linux.vnet.ibm.com> Acked-by:
Ian Munsie <imunsie@au1.ibm.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
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Andrew Donnellan authored
In eeh_pci_enable(), after making the request to set the new options, we call eeh_ops->wait_state() to check that the request finished successfully. At the moment, if eeh_ops->wait_state() returns 0, we return 0 without checking that it reflects the expected outcome. This can lead to callers further up the chain incorrectly assuming the slot has been successfully unfrozen and continuing to attempt recovery. On powernv, this will occur if pnv_eeh_get_pe_state() or pnv_eeh_get_phb_state() return 0, which in turn occurs if the relevant OPAL call returns OPAL_EEH_STOPPED_MMIO_DMA_FREEZE or OPAL_EEH_PHB_ERROR respectively. On pseries, this will occur if pseries_eeh_get_state() returns 0, which in turn occurs if RTAS reports that the PE is in the MMIO Stopped and DMA Stopped states. Obviously, none of these cases represent a successful completion of a request to thaw MMIO or DMA. Fix the check so that a wait_state() return value of 0 won't be considered successful for the EEH_OPT_THAW_MMIO or EEH_OPT_THAW_DMA cases. Signed-off-by:
Andrew Donnellan <andrew.donnellan@au1.ibm.com> Acked-by:
Gavin Shan <gwshan@linux.vnet.ibm.com> Reviewed-by:
Daniel Axtens <dja@axtens.net> Signed-off-by:
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- 08 Mar, 2016 14 commits
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Gavin Shan authored
When eeh_dump_pe_log() is only called by eeh_slot_error_detail(), we already have the check that the PE isn't in PCI config blocked state in eeh_slot_error_detail(). So we needn't the duplicated check in eeh_dump_pe_log(). This removes the duplicated check in eeh_dump_pe_log(). No logical changes introduced. Signed-off-by:
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Gavin Shan authored
When passing through SRIOV VFs to guest, we possibly encounter EEH error on PF. In this case, the VF PEs are put into frozen state. The error could be reported to guest before it's captured by the host. That means the guest could attempt to recover errors on VFs before host gets chance to recover errors on PFs. The VFs won't be recovered successfully. This enforces the recovery order for above case: the recovery on child PE in guest is hold until the recovery on parent PE in host is completed. Signed-off-by:
Russell Currey <ruscur@russell.cc> Signed-off-by:
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Gavin Shan authored
When we have partial hotplug as part of the error recovery on PF, the VFs that are bound with vfio-pci driver will experience hotplug. That's not allowed. This checks if the VF PE is passed or not. If it does, we leave the VF without removing it. Signed-off-by:
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Gavin Shan authored
When EEH error happened to the parent PE of those PEs that have been passed through to guest, the error is propagated to guest domain and the VFIO driver's error handlers are called. It's not correct as the error in the host domain shouldn't be propagated to guests and affect them. This adds one more limitation when calling EEH error handlers. If the PE has been passed through to guest, the error handlers won't be called. Signed-off-by:
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Wei Yang authored
PFs are enumerated on PCI bus, while VFs are created by PF's driver. In EEH recovery, it has two cases: 1. Device and driver is EEH aware, error handlers are called. 2. Device and driver is not EEH aware, un-plug the device and plug it again by enumerating it. The special thing happens on the second case. For a PF, we could use the original pci core to enumerate the bus, while for VF we need to record the VFs which aer un-plugged then plug it again. Also The patch caches the VF index in pci_dn, which can be used to calculate VF's bus, device and function number. Those information helps to locate the VF's PCI device instance when doing hotplug during EEH recovery if necessary. Signed-off-by:
Wei Yang <weiyang@linux.vnet.ibm.com> Acked-by:
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Wei Yang authored
After PE reset, OPAL API opal_pci_reinit() is called on all devices contained in the PE to reinitialize them. While skiboot is not aware of VFs, we have to implement the function in kernel to reinitialize VFs after reset on PE for VFs. In this patch, two functions pnv_pci_fixup_vf_mps() and pnv_eeh_restore_vf_config() both manipulate the MPS of the VF, since for a VF it has three cases. 1. Normal creation for a VF In this case, pnv_pci_fixup_vf_mps() is called to make the MPS a proper value compared with its parent. 2. EEH recovery without VF removed In this case, MPS is stored in pci_dn and pnv_eeh_restore_vf_config() is called to restore it and reinitialize other part. 3. EEH recovery with VF removed In this case, VF will be removed then re-created. Both functions are called. First pnv_pci_fixup_vf_mps() is called to store the proper MPS to pci_dn and then pnv_eeh_restore_vf_config() is called to do proper thing. This introduces two functions: pnv_pci_fixup_vf_mps() to fixup the VF's MPS to make sure it is equal to parent's and store this value in pci_dn for future use. pnv_eeh_restore_vf_config() to re-initialize on VF by restoring MPS, disabling completion timeout, enabling SERR, etc. Signed-off-by:
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Wei Yang authored
PEs for VFs don't have primary bus. So they have to have their own reset backend, which is used during EEH recovery. The patch implements the reset backend for VF's PE by issuing FLR or AF FLR to the VFs, which are contained in the PE. Signed-off-by:
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Wei Yang authored
This creates PEs for VFs in the weak function pcibios_bus_add_device(). Those PEs for VFs are identified with newly introduced flag EEH_PE_VF so that we treat them differently during EEH recovery. Signed-off-by:
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Wei Yang authored
VFs and their corresponding pdn are created and released dynamically when their PF's SRIOV capability is enabled and disabled. This creates and releases EEH devices for VFs when creating and releasing their pdn instances, which means EEH devices and pdn instances have same life cycle. Also, VF's EEH device is identified by (struct eeh_dev::physfn). Signed-off-by:
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Wei Yang authored
This restricts the EEH address cache to use only the first 7 BARs. This makes __eeh_addr_cache_insert_dev() ignore PCI bridge window and IOV BARs. As the result of this change, eeh_addr_cache_get_dev() will return VFs from VF's resource addresses instead of parent PFs. This also removes PCI bridge check as we limit __eeh_addr_cache_insert_dev() to 7 BARs and this effectively excludes PCI bridges from being cached. Signed-off-by:
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Wei Yang authored
As commit ac205b7b ("PCI: make sriov work with hotplug remove") indicates, VFs which is on the same PCI bus as their PF, should be removed before the PF. Otherwise, we might run into kernel crash at PCI unplugging time. This applies the above pattern to powerpc PCI hotplug path. Signed-off-by:
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Wei Yang authored
This adds weak function pcibios_bus_add_device() for arch dependent code could do proper setup. For example, powerpc could setup EEH related resources for SRIOV VFs. Signed-off-by:
Bjorn Helgaas <bhelgaas@google.com> Signed-off-by:
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Wei Yang authored
During EEH recovery, hotplug is applied to the devices which don't have drivers or their drivers don't support EEH. However, the hotplug, which was implemented based on PCI bus, can't be applied to VF directly. Instead, we unplug and plug individual PCI devices (VFs). This renames virtn_{add,remove}() and exports them so they can be used in PCI hotplug during EEH recovery. Signed-off-by: -
Gavin Shan authored
The original implementation is ugly: unnecessary if statements and "out" tag. This reworks the function to avoid above weaknesses. No functional changes introduced. Signed-off-by:
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- 03 Mar, 2016 8 commits
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Aneesh Kumar K.V authored
No code changes. Signed-off-by:
Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by:
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Aneesh Kumar K.V authored
No code changes. Signed-off-by:
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Aneesh Kumar K.V authored
We don't need to update linux page table entry with _PAGE_HASHPTE early in hash pte fault. A parallel pte update will loop via _PAGE_BUSY and look at _PAGE_HASHPTE for a required hpte flush only if _PAGE_BUSY is cleared. That ensures a pte update will wait for a parallel hpte insert to finish before looking at _PAGE_HASHPTE bit. To avoid further confusion drop setting _PAGE_HASHPTE in cmpxchg in __hash_page_4K. commit 41743a4e ("powerpc: Free a PTE bit on ppc64 with 64K pages") did similar change for 64K config Signed-off-by:
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Aneesh Kumar K.V authored
We are updating pte in those functions. Signed-off-by:
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Kirill A. Shutemov authored
With next generation power processor, we are having a new mmu model [1] that require us to maintain a different linux page table format. Inorder to support both current and future ppc64 systems with a single kernel we need to make sure kernel can select between different page table format at runtime. With the new MMU (radix MMU) added, we will have two different pmd hugepage size 16MB for hash model and 2MB for Radix model. Hence make HPAGE_PMD related values as a variable. Actual conversion of HPAGE_PMD to a variable for ppc64 happens in a followup patch. [1] http://ibm.biz/power-isa3 (Needs registration). Signed-off-by:
Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by:
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Aneesh Kumar K.V authored
This is needed so that we can support both hash and radix page table using single kernel. Radix kernel uses a 4 level table. We now use physical address in upper page table tree levels. Even though they are aligned to their size, for the masked bits we use the bit positions as per PowerISA 3.0. Signed-off-by:
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Aneesh Kumar K.V authored
We remove real_pte_t out of STRICT_MM_TYPESCHECK. Reviewed-by:
Paul Mackerras <paulus@samba.org> Signed-off-by:
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Aneesh Kumar K.V authored
We move the page table accessors into a separate header. We will later add a big endian variant of the table which is needed for radix. No functionality change only code movement. Reviewed-by:
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- 02 Mar, 2016 11 commits
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Cyril Bur authored
This patch adds the ability to be able to save the VSX registers to the thread struct without giving up (disabling the facility) next time the process returns to userspace. This patch builds on a previous optimisation for the FPU and VEC registers in the thread copy path to avoid a possibly pointless reload of VSX state. Signed-off-by:
Cyril Bur <cyrilbur@gmail.com> Signed-off-by:
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Cyril Bur authored
This patch adds the ability to be able to save the VEC registers to the thread struct without giving up (disabling the facility) next time the process returns to userspace. This patch builds on a previous optimisation for the FPU registers in the thread copy path to avoid a possibly pointless reload of VEC state. Signed-off-by:
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Cyril Bur authored
This patch adds the ability to be able to save the FPU registers to the thread struct without giving up (disabling the facility) next time the process returns to userspace. This patch optimises the thread copy path (as a result of a fork() or clone()) so that the parent thread can return to userspace with hot registers avoiding a possibly pointless reload of FPU register state. Signed-off-by:
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Cyril Bur authored
This prepares for the decoupling of saving {fpu,altivec,vsx} registers and marking {fpu,altivec,vsx} as being unused by a thread. Currently giveup_{fpu,altivec,vsx}() does both however optimisations to task switching can be made if these two operations are decoupled. save_all() will permit the saving of registers to thread structs and leave threads MSR with bits enabled. This patch introduces no functional change. Signed-off-by: -
Cyril Bur authored
Currently the FPU, VEC and VSX facilities are lazily loaded. This is not a problem unless a process is using these facilities. Modern versions of GCC are very good at automatically vectorising code, new and modernised workloads make use of floating point and vector facilities, even the kernel makes use of vectorised memcpy. All this combined greatly increases the cost of a syscall since the kernel uses the facilities sometimes even in syscall fast-path making it increasingly common for a thread to take an *_unavailable exception soon after a syscall, not to mention potentially taking all three. The obvious overcompensation to this problem is to simply always load all the facilities on every exit to userspace. Loading up all FPU, VEC and VSX registers every time can be expensive and if a workload does avoid using them, it should not be forced to incur this penalty. An 8bit counter is used to detect if the registers have been used in the past and the registers are always loaded until the value wraps to back to zero. Several versions of the assembly in entry_64.S were tested: 1. Always calling C. 2. Performing a common case check and then calling C. 3. A complex check in asm. After some benchmarking it was determined that avoiding C in the common case is a performance benefit (option 2). The full check in asm (option 3) greatly complicated that codepath for a negligible performance gain and the trade-off was deemed not worth it. Signed-off-by:
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Cyril Bur authored
Currently when threads get scheduled off they always giveup the FPU, Altivec (VMX) and Vector (VSX) units if they were using them. When they are scheduled back on a fault is then taken to enable each facility and load registers. As a result explicitly disabling FPU/VMX/VSX has not been necessary. Future changes and optimisations remove this mandatory giveup and fault which could cause calls such as clone() and fork() to copy threads and run them later with FPU/VMX/VSX enabled but no registers loaded. This patch starts the process of having MSR_{FP,VEC,VSX} mean that a threads registers are hot while not having MSR_{FP,VEC,VSX} means that the registers must be loaded. This allows for a smarter return to userspace. Signed-off-by: -
Cyril Bur authored
Load up the non volatile FPU and VMX regs and ensure that they are the expected value in a signal handler Signed-off-by:
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Cyril Bur authored
Loop in assembly checking the registers with many threads. Signed-off-by:
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Cyril Bur authored
Test that the non volatile floating point and Altivec registers get correctly preserved across the fork() syscall. fork() works nicely for this purpose, the registers should be the same for both parent and child Signed-off-by:
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Suraj Jitindar Singh authored
LTO can cause GCC to inline some functions which have attributes set. The act of inlining the functions can lead to GCC forgetting about the attributes which leads to incorrect tests. Notable example being: __attribute__((__target__("no-vsx"))) LTO can also interact strangely with custom assembly functions and cause tests to intermittently fail. Both these cases are hard to detect and require manual inspection of binaries which is unlikely to happen for all tests. Furthermore, LTO optimisations are not necessary for selftests and correctness is paramount and as such it is best to disable LTO. LTO can be enabled on a per test basis. A pseries_le_defconfig kernel on a POWER8 was used to determine that the same subset of selftests pass and fail with and without -flto in the common Makefile. Signed-off-by:Suraj Jitindar Singh <sjitindarsingh@gmail.com> Reviewed-by:
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Michael Ellerman authored
Gcc helpfully points out that we're accessing past the end of the gprs array: tm-signal-msr-resv.c: In function 'signal_usr1': tm-signal-msr-resv.c:43:37: error: array subscript is above array bounds [-Werror=array-bounds] ucp->uc_mcontext.regs->gpr[PT_MSR] |= (7ULL); We haven't noticed previously because -flto was hiding it somehow. The code is confused, PT_MSR isn't a gpr, instead it's in uc_regs->gregs, so fix it. Signed-off-by:
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- 01 Mar, 2016 5 commits
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David Gibson authored
htab_get_table_size() either retrieve the size of the hash page table (HPT) from the device tree - if the HPT size is determined by firmware - or uses a heuristic to determine a good size based on RAM size if the kernel is responsible for allocating the HPT. To support a PAPR extension allowing resizing of the HPT, we're going to want the memory size -> HPT size logic elsewhere, so split it out into a helper function. Signed-off-by:
David Gibson <david@gibson.dropbear.id.au> Reviewed-by:
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David Gibson authored
This makes a number of cleanups to handling of mapping failures during memory hotplug on Power: For errors creating the linear mapping for the hot-added region: * This is now reported with EFAULT which is more appropriate than the previous EINVAL (the failure is unlikely to be related to the function's parameters) * An error in this path now prints a warning message, rather than just silently failing to add the extra memory. * Previously a failure here could result in the region being partially mapped. We now clean up any partial mapping before failing. For errors creating the vmemmap for the hot-added region: * This is now reported with EFAULT instead of causing a BUG() - this could happen for external reason (e.g. full hash table) so it's better to handle this non-fatally * An error message is also printed, so the failure won't be silent * As above a failure could cause a partially mapped region, we now clean this up. [mpe: move htab_remove_mapping() out of #ifdef CONFIG_MEMORY_HOTPLUG to enable this] Signed-off-by: -
David Gibson authored
At the moment the hpte_removebolted callback in ppc_md returns void and will BUG_ON() if the hpte it's asked to remove doesn't exist in the first place. This is awkward for the case of cleaning up a mapping which was partially made before failing. So, we add a return value to hpte_removebolted, and have it return ENOENT in the case that the HPTE to remove didn't exist in the first place. In the (sole) caller, we propagate errors in hpte_removebolted to its caller to handle. However, we handle ENOENT specially, continuing to complete the unmapping over the specified range before returning the error to the caller. This means that htab_remove_mapping() will work sanely on a partially present mapping, removing any HPTEs which are present, while also returning ENOENT to its caller in case it's important there. There are two callers of htab_remove_mapping(): - In remove_section_mapping() we already WARN_ON() any error return, which is reasonable - in this case the mapping should be fully present - In vmemmap_remove_mapping() we BUG_ON() any error. We change that to just a WARN_ON() in the case of ENOENT, since failing to remove a mapping that wasn't there in the first place probably shouldn't be fatal. Signed-off-by: -
David Gibson authored
Currently, the only error that htab_remove_mapping() can report is -EINVAL, if removal of bolted HPTEs isn't implemeted for this platform. We make a few clean ups to the handling of this: * EINVAL isn't really the right code - there's nothing wrong with the function's arguments - use ENODEV instead * We were also printing a warning message, but that's a decision better left up to the callers, so remove it * One caller is vmemmap_remove_mapping(), which will just BUG_ON() on error, making the warning message redundant, so no change is needed there. * The other caller is remove_section_mapping(). This is called in the memory hot remove path at a point after vmemmap_remove_mapping() so if hpte_removebolted isn't implemented, we'd expect to have already BUG()ed anyway. Put a WARN_ON() here, in lieu of a printk() since this really shouldn't be happening. Signed-off-by:
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Adam Buchbinder authored
Signed-off-by:
Adam Buchbinder <adam.buchbinder@gmail.com> Signed-off-by:
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