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* powerpc/iommu: Move dev_has_iommu_table() to iommu.cShivaprasad G Bhat2024-06-281-16/+0
| | | | | | | | | | | Move function dev_has_iommu_table() to powerpc/kernel/iommu.c as it is going to be used by machine specific iommu code as well in subsequent patches. Signed-off-by: Shivaprasad G Bhat <sbhat@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/171923274748.1397.6274953248403106679.stgit@linux.ibm.com
* powerpc/eeh: Permanently disable the removed deviceGanesh Goudar2024-04-291-1/+10
| | | | | | | | | | | | | | | | | | | | When a device is hot removed on powernv, the hotplug driver clears the device's state. However, on pseries, if a device is removed by phyp after reaching the error threshold, the kernel remains unaware, leading to the device not being torn down. This prevents necessary remediation actions like failover. Permanently disable the device if the presence check fails. Also, in eeh_dev_check_failure in we may consider the error as false positive if the device is hotpluged out as the get_state call returns EEH_STATE_NOT_SUPPORT and we may end up not clearing the device state, so log the event if the state is not moved to permanent failure state. Signed-off-by: Ganesh Goudar <ganeshgr@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/20240422075737.1405551-1-ganeshgr@linux.ibm.com
* powerpc: fix typos in commentsJulia Lawall2022-05-051-2/+2
| | | | | | | | | | | Various spelling mistakes in comments. Detected with the help of Coccinelle. Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr> Reviewed-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20220430185654.5855-1-Julia.Lawall@inria.fr
* Merge tag 'pci-v5.16-changes' of ↵Linus Torvalds2021-11-061-0/+8
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci Pull pci updates from Bjorn Helgaas: "Enumeration: - Conserve IRQs by setting up portdrv IRQs only when there are users (Jan Kiszka) - Rework and simplify _OSC negotiation for control of PCIe features (Joerg Roedel) - Remove struct pci_dev.driver pointer since it's redundant with the struct device.driver pointer (Uwe Kleine-König) Resource management: - Coalesce contiguous host bridge apertures from _CRS to accommodate BARs that cover more than one aperture (Kai-Heng Feng) Sysfs: - Check CAP_SYS_ADMIN before parsing user input (Krzysztof Wilczyński) - Return -EINVAL consistently from "store" functions (Krzysztof Wilczyński) - Use sysfs_emit() in endpoint "show" functions to avoid buffer overruns (Kunihiko Hayashi) PCIe native device hotplug: - Ignore Link Down/Up caused by resets during error recovery so endpoint drivers can remain bound to the device (Lukas Wunner) Virtualization: - Avoid bus resets on Atheros QCA6174, where they hang the device (Ingmar Klein) - Work around Pericom PI7C9X2G switch packet drop erratum by using store and forward mode instead of cut-through (Nathan Rossi) - Avoid trying to enable AtomicOps on VFs; the PF setting applies to all VFs (Selvin Xavier) MSI: - Document that /sys/bus/pci/devices/.../irq contains the legacy INTx interrupt or the IRQ of the first MSI (not MSI-X) vector (Barry Song) VPD: - Add pci_read_vpd_any() and pci_write_vpd_any() to access anywhere in the possible VPD space; use these to simplify the cxgb3 driver (Heiner Kallweit) Peer-to-peer DMA: - Add (not subtract) the bus offset when calculating DMA address (Wang Lu) ASPM: - Re-enable LTR at Downstream Ports so they don't report Unsupported Requests when reset or hot-added devices send LTR messages (Mingchuang Qiao) Apple PCIe controller driver: - Add driver for Apple M1 PCIe controller (Alyssa Rosenzweig, Marc Zyngier) Cadence PCIe controller driver: - Return success when probe succeeds instead of falling into error path (Li Chen) HiSilicon Kirin PCIe controller driver: - Reorganize PHY logic and add support for external PHY drivers (Mauro Carvalho Chehab) - Support PERST# GPIOs for HiKey970 external PEX 8606 bridge (Mauro Carvalho Chehab) - Add Kirin 970 support (Mauro Carvalho Chehab) - Make driver removable (Mauro Carvalho Chehab) Intel VMD host bridge driver: - If IOMMU supports interrupt remapping, leave VMD MSI-X remapping enabled (Adrian Huang) - Number each controller so we can tell them apart in /proc/interrupts (Chunguang Xu) - Avoid building on UML because VMD depends on x86 bare metal APIs (Johannes Berg) Marvell Aardvark PCIe controller driver: - Define macros for PCI_EXP_DEVCTL_PAYLOAD_* (Pali Rohár) - Set Max Payload Size to 512 bytes per Marvell spec (Pali Rohár) - Downgrade PIO Response Status messages to debug level (Marek Behún) - Preserve CRS SV (Config Request Retry Software Visibility) bit in emulated Root Control register (Pali Rohár) - Fix issue in configuring reference clock (Pali Rohár) - Don't clear status bits for masked interrupts (Pali Rohár) - Don't mask unused interrupts (Pali Rohár) - Avoid code repetition in advk_pcie_rd_conf() (Marek Behún) - Retry config accesses on CRS response (Pali Rohár) - Simplify emulated Root Capabilities initialization (Pali Rohár) - Fix several link training issues (Pali Rohár) - Fix link-up checking via LTSSM (Pali Rohár) - Fix reporting of Data Link Layer Link Active (Pali Rohár) - Fix emulation of W1C bits (Marek Behún) - Fix MSI domain .alloc() method to return zero on success (Marek Behún) - Read entire 16-bit MSI vector in MSI handler, not just low 8 bits (Marek Behún) - Clear Root Port I/O Space, Memory Space, and Bus Master Enable bits at startup; PCI core will set those as necessary (Pali Rohár) - When operating as a Root Port, set class code to "PCI Bridge" instead of the default "Mass Storage Controller" (Pali Rohár) - Add emulation for PCI_BRIDGE_CTL_BUS_RESET since aardvark doesn't implement this per spec (Pali Rohár) - Add emulation of option ROM BAR since aardvark doesn't implement this per spec (Pali Rohár) MediaTek MT7621 PCIe controller driver: - Add MediaTek MT7621 PCIe host controller driver and DT binding (Sergio Paracuellos) Qualcomm PCIe controller driver: - Add SC8180x compatible string (Bjorn Andersson) - Add endpoint controller driver and DT binding (Manivannan Sadhasivam) - Restructure to use of_device_get_match_data() (Prasad Malisetty) - Add SC7280-specific pcie_1_pipe_clk_src handling (Prasad Malisetty) Renesas R-Car PCIe controller driver: - Remove unnecessary includes (Geert Uytterhoeven) Rockchip DesignWare PCIe controller driver: - Add DT binding (Simon Xue) Socionext UniPhier Pro5 controller driver: - Serialize INTx masking/unmasking (Kunihiko Hayashi) Synopsys DesignWare PCIe controller driver: - Run dwc .host_init() method before registering MSI interrupt handler so we can deal with pending interrupts left by bootloader (Bjorn Andersson) - Clean up Kconfig dependencies (Andy Shevchenko) - Export symbols to allow more modular drivers (Luca Ceresoli) TI DRA7xx PCIe controller driver: - Allow host and endpoint drivers to be modules (Luca Ceresoli) - Enable external clock if present (Luca Ceresoli) TI J721E PCIe driver: - Disable PHY when probe fails after initializing it (Christophe JAILLET) MicroSemi Switchtec management driver: - Return error to application when command execution fails because an out-of-band reset has cleared the device BARs, Memory Space Enable, etc (Kelvin Cao) - Fix MRPC error status handling issue (Kelvin Cao) - Mask out other bits when reading of management VEP instance ID (Kelvin Cao) - Return EOPNOTSUPP instead of ENOTSUPP from sysfs show functions (Kelvin Cao) - Add check of event support (Logan Gunthorpe) Miscellaneous: - Remove unused pci_pool wrappers, which have been replaced by dma_pool (Cai Huoqing) - Use 'unsigned int' instead of bare 'unsigned' (Krzysztof Wilczyński) - Use kstrtobool() directly, sans strtobool() wrapper (Krzysztof Wilczyński) - Fix some sscanf(), sprintf() format mismatches (Krzysztof Wilczyński) - Update PCI subsystem information in MAINTAINERS (Krzysztof Wilczyński) - Correct some misspellings (Krzysztof Wilczyński)" * tag 'pci-v5.16-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: (137 commits) PCI: Add ACS quirk for Pericom PI7C9X2G switches PCI: apple: Configure RID to SID mapper on device addition iommu/dart: Exclude MSI doorbell from PCIe device IOVA range PCI: apple: Implement MSI support PCI: apple: Add INTx and per-port interrupt support PCI: kirin: Allow removing the driver PCI: kirin: De-init the dwc driver PCI: kirin: Disable clkreq during poweroff sequence PCI: kirin: Move the power-off code to a common routine PCI: kirin: Add power_off support for Kirin 960 PHY PCI: kirin: Allow building it as a module PCI: kirin: Add MODULE_* macros PCI: kirin: Add Kirin 970 compatible PCI: kirin: Support PERST# GPIOs for HiKey970 external PEX 8606 bridge PCI: apple: Set up reference clocks when probing PCI: apple: Add initial hardware bring-up PCI: of: Allow matching of an interrupt-map local to a PCI device of/irq: Allow matching of an interrupt-map local to an interrupt controller irqdomain: Make of_phandle_args_to_fwspec() generally available PCI: Do not enable AtomicOps on VFs ...
| * powerpc/eeh: Use dev_driver_string() instead of struct pci_dev->driver->nameUwe Kleine-König2021-10-131-0/+8
| | | | | | | | | | | | | | | | | | | | | | | | Replace pdev->driver->name by dev_driver_string() for the corresponding struct device. This is a step toward removing pci_dev->driver. Move the function nearer its only user and instead of the ?: operator use a normal "if" which is more readable. Link: https://lore.kernel.org/r/20211004125935.2300113-6-u.kleine-koenig@pengutronix.de Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
* | powerpc/eeh: Fix docstrings in eeh.cKai Song2021-10-131-4/+8
|/ | | | | | | | | | | | | | | | | | We fix the following warnings when building kernel with W=1: arch/powerpc/kernel/eeh.c:598: warning: Function parameter or member 'function' not described in 'eeh_pci_enable' arch/powerpc/kernel/eeh.c:774: warning: Function parameter or member 'edev' not described in 'eeh_set_dev_freset' arch/powerpc/kernel/eeh.c:774: warning: expecting prototype for eeh_set_pe_freset(). Prototype was for eeh_set_dev_freset() instead arch/powerpc/kernel/eeh.c:814: warning: Function parameter or member 'include_passed' not described in 'eeh_pe_reset_full' arch/powerpc/kernel/eeh.c:944: warning: Function parameter or member 'ops' not described in 'eeh_init' arch/powerpc/kernel/eeh.c:1451: warning: Function parameter or member 'include_passed' not described in 'eeh_pe_reset' arch/powerpc/kernel/eeh.c:1526: warning: Function parameter or member 'func' not described in 'eeh_pe_inject_err' arch/powerpc/kernel/eeh.c:1526: warning: Excess function parameter 'function' described in 'eeh_pe_inject_err' Signed-off-by: Kai Song <songkai01@inspur.com> Reviewed-by: Daniel Axtens <dja@axtens.net> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20211009041630.4135-1-songkai01@inspur.com
* powerpc: rename powerpc_debugfs_root to arch_debugfs_dirAneesh Kumar K.V2021-08-131-8/+8
| | | | | | | | | | | | No functional change in this patch. arch_debugfs_dir is the generic kernel name declared in linux/debugfs.h for arch-specific debugfs directory. Architectures like x86/s390 already use the name. Rename powerpc specific powerpc_debugfs_root to arch_debugfs_dir. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210812132831.233794-2-aneesh.kumar@linux.ibm.com
* powerpc: Fix reverse map real-mode address lookup with huge vmallocNicholas Piggin2021-05-281-22/+1
| | | | | | | | | | | | | real_vmalloc_addr() does not currently work for huge vmalloc, which is what the reverse map can be allocated with for radix host, hash guest. Extract the hugepage aware equivalent from eeh code into a helper, and convert existing sites including this one to use it. Fixes: 8abddd968a30 ("powerpc/64s/radix: Enable huge vmalloc mappings") Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210526120005.3432222-1-npiggin@gmail.com
* powerpc/eeh: remove unneeded semicolonYang Li2021-04-221-1/+1
| | | | | | | | | | | | Eliminate the following coccicheck warning: ./arch/powerpc/kernel/eeh.c:782:2-3: Unneeded semicolon Reported-by: Abaci Robot <abaci@linux.alibaba.com> Signed-off-by: Yang Li <yang.lee@linux.alibaba.com> Reviewed-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1612236096-91154-1-git-send-email-yang.lee@linux.alibaba.com
* powerpc/eeh: Fix EEH handling for hugepages in ioremap space.Mahesh Salgaonkar2021-04-141-7/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | During the EEH MMIO error checking, the current implementation fails to map the (virtual) MMIO address back to the pci device on radix with hugepage mappings for I/O. This results into failure to dispatch EEH event with no recovery even when EEH capability has been enabled on the device. eeh_check_failure(token) # token = virtual MMIO address addr = eeh_token_to_phys(token); edev = eeh_addr_cache_get_dev(addr); if (!edev) return 0; eeh_dev_check_failure(edev); <= Dispatch the EEH event In case of hugepage mappings, eeh_token_to_phys() has a bug in virt -> phys translation that results in wrong physical address, which is then passed to eeh_addr_cache_get_dev() to match it against cached pci I/O address ranges to get to a PCI device. Hence, it fails to find a match and the EEH event never gets dispatched leaving the device in failed state. The commit 33439620680be ("powerpc/eeh: Handle hugepages in ioremap space") introduced following logic to translate virt to phys for hugepage mappings: eeh_token_to_phys(): + pa = pte_pfn(*ptep); + + /* On radix we can do hugepage mappings for io, so handle that */ + if (hugepage_shift) { + pa <<= hugepage_shift; <= This is wrong + pa |= token & ((1ul << hugepage_shift) - 1); + } This patch fixes the virt -> phys translation in eeh_token_to_phys() function. $ cat /sys/kernel/debug/powerpc/eeh_address_cache mem addr range [0x0000040080000000-0x00000400807fffff]: 0030:01:00.1 mem addr range [0x0000040080800000-0x0000040080ffffff]: 0030:01:00.1 mem addr range [0x0000040081000000-0x00000400817fffff]: 0030:01:00.0 mem addr range [0x0000040081800000-0x0000040081ffffff]: 0030:01:00.0 mem addr range [0x0000040082000000-0x000004008207ffff]: 0030:01:00.1 mem addr range [0x0000040082080000-0x00000400820fffff]: 0030:01:00.0 mem addr range [0x0000040082100000-0x000004008210ffff]: 0030:01:00.1 mem addr range [0x0000040082110000-0x000004008211ffff]: 0030:01:00.0 Above is the list of cached io address ranges of pci 0030:01:00.<fn>. Before this patch: Tracing 'arg1' of function eeh_addr_cache_get_dev() during error injection clearly shows that 'addr=' contains wrong physical address: kworker/u16:0-7 [001] .... 108.883775: eeh_addr_cache_get_dev: (eeh_addr_cache_get_dev+0xc/0xf0) addr=0x80103000a510 dmesg shows no EEH recovery messages: [ 108.563768] bnx2x: [bnx2x_timer:5801(eth2)]MFW seems hanged: drv_pulse (0x9ae) != mcp_pulse (0x7fff) [ 108.563788] bnx2x: [bnx2x_hw_stats_update:870(eth2)]NIG timer max (4294967295) [ 108.883788] bnx2x: [bnx2x_acquire_hw_lock:2013(eth1)]lock_status 0xffffffff resource_bit 0x1 [ 108.884407] bnx2x 0030:01:00.0 eth1: MDC/MDIO access timeout [ 108.884976] bnx2x 0030:01:00.0 eth1: MDC/MDIO access timeout <..> After this patch: eeh_addr_cache_get_dev() trace shows correct physical address: <idle>-0 [001] ..s. 1043.123828: eeh_addr_cache_get_dev: (eeh_addr_cache_get_dev+0xc/0xf0) addr=0x40080bc7cd8 dmesg logs shows EEH recovery getting triggerred: [ 964.323980] bnx2x: [bnx2x_timer:5801(eth2)]MFW seems hanged: drv_pulse (0x746f) != mcp_pulse (0x7fff) [ 964.323991] EEH: Recovering PHB#30-PE#10000 [ 964.324002] EEH: PE location: N/A, PHB location: N/A [ 964.324006] EEH: Frozen PHB#30-PE#10000 detected <..> Fixes: 33439620680b ("powerpc/eeh: Handle hugepages in ioremap space") Cc: stable@vger.kernel.org # v5.3+ Reported-by: Dominic DeMarco <ddemarc@us.ibm.com> Signed-off-by: Mahesh Salgaonkar <mahesh@linux.ibm.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/161821396263.48361.2796709239866588652.stgit@jupiter
* powerpc/eeh: Fix build failure with CONFIG_PROC_FS=nMichael Ellerman2021-03-291-0/+2
| | | | | | | | | | | | The build fails with CONFIG_PROC_FS=n: arch/powerpc/kernel/eeh.c:1571:12: error: ‘proc_eeh_show’ defined but not used 1571 | static int proc_eeh_show(struct seq_file *m, void *v) Wrap proc_eeh_show() in an ifdef to avoid it. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210314093300.131998-1-mpe@ellerman.id.au
* powerpc/eeh: Add a debugfs interface to check if a driver supports recoveryOliver O'Halloran2021-01-311-0/+50
| | | | | | | | | | | | | | | | | If a PCI device's current driver implements the error handling callbacks EEH can use them to recover the device after an error occurs. For devices without the error handling callbacks we recover them by removing the device and re-scanning it so the PCI core puts the device back into a known good state. Currently there's no way for userspace to determine if the driver supports recovery or not which makes it difficult to write automated tests for EEH. This patch addressing that by adding a debugfs interface for querying if a specific device can be recovered or not. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201103051512.919333-2-oohall@gmail.com
* powerpc/eeh: Rework pci_dev lookup in debugfs attributesOliver O'Halloran2021-01-311-34/+37
| | | | | | | | Pull the string -> pci_dev lookup stuff into a helper function. No functional change. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201103051512.919333-1-oohall@gmail.com
* powerpc/eeh: Fix eeh_dev_check_failure() for PE#0Oliver O'Halloran2020-10-221-5/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In commit 269e583357df ("powerpc/eeh: Delete eeh_pe->config_addr") the following simplification was made: - if (!pe->addr && !pe->config_addr) { + if (!pe->addr) { eeh_stats.no_cfg_addr++; return 0; } This introduced a bug which causes EEH checking to be skipped for devices in PE#0. Before the change above the check would always pass since at least one of the two PE addresses would be non-zero in all circumstances. On PowerNV pe->config_addr would be the BDFN of the first device added to the PE. The zero BDFN is reserved for the PHB's root port, but this is fine since for obscure platform reasons the root port is never assigned to PE#0. Similarly, on pseries pe->addr has always been non-zero for the reasons outlined in commit 42de19d5ef71 ("powerpc/pseries/eeh: Allow zero to be a valid PE configuration address"). We can fix the problem by deleting the block entirely The original purpose of this test was to avoid performing EEH checks on devices that were not on an EEH capable bus. In modern Linux the edev->pe pointer will be NULL for devices that are not on an EEH capable bus. The code block immediately above this one already checks for the edev->pe == NULL case so this test (new and old) is entirely redundant. Ideally we'd delete eeh_stats.no_cfg_addr too since nothing increments it any more. Unfortunately, that information is exposed via /proc/powerpc/eeh which means it's technically ABI. We could make it hard-coded, but that's a change for another patch. Fixes: 269e583357df ("powerpc/eeh: Delete eeh_pe->config_addr") Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201021232554.1434687-1-oohall@gmail.com
* powerpc/eeh: Delete eeh_pe->config_addrOliver O'Halloran2020-10-071-1/+1
| | | | | | | | | | The eeh_pe->config_addr field was supposed to be removed in commit 35d64734b643 ("powerpc/eeh: Clean up PE addressing") which made it largely unused. Finish the job. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201007040903.819081-1-oohall@gmail.com
* powerpc/eeh: Clean up PE addressingOliver O'Halloran2020-10-061-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When support for EEH on PowerNV was added a lot of pseries specific code was made "generic" and some of the quirks of pseries EEH came along for the ride. One of the stranger quirks is eeh_pe containing two types of PE address: pe->addr and pe->config_addr. There reason for this appears to be historical baggage rather than any real requirements. On pseries EEH PEs are manipulated using RTAS calls. Each EEH RTAS call takes a "PE configuration address" as an input which is used to identify which EEH PE is being manipulated by the call. When initialising the EEH state for a device the first thing we need to do is determine the configuration address for the PE which contains the device so we can enable EEH on that PE. This process is outlined in PAPR which is the modern (i.e post-2003) FW specification for pseries. However, EEH support was first described in the pSeries RISC Platform Architecture (RPA) and although they are mostly compatible EEH is one of the areas where they are not. The major difference is that RPA doesn't actually have the concept of a PE. On RPA systems the EEH RTAS calls are done on a per-device basis using the same config_addr that would be passed to the RTAS functions to access PCI config space (e.g. ibm,read-pci-config). The config_addr is not identical since the function and config register offsets of the config_addr must be set to zero. EEH operations being done on a per-device basis doesn't make a whole lot of sense when you consider how EEH was implemented on legacy PCI systems. For legacy PCI(-X) systems EEH was implemented using special PCI-PCI bridges which contained logic to detect errors and freeze the secondary bus when one occurred. This means that the EEH enabled state is shared among all devices behind that EEH bridge. As a result there's no way to implement the per-device control required for the semantics specified by RPA. It can be made to work if we assume that a separate EEH bridge exists for each EEH capable PCI slot and there are no bridges behind those slots. However, RPA also specifies the ibm,configure-bridge RTAS call for re-initalising bridges behind EEH capable slots after they are reset due to an EEH event so that is probably not a valid assumption. This incoherence was fixed in later PAPR, which succeeded RPA. Unfortunately, since Linux EEH support seems to have been implemented based on the RPA spec some of the legacy assumptions were carried over (probably for POWER4 compatibility). The fix made in PAPR was the introduction of the "PE" concept and redefining the EEH RTAS calls (set-eeh-option, reset-slot, etc) to operate on a per-PE basis so all devices behind an EEH bride would share the same EEH state. The "config_addr" argument to the EEH RTAS calls became the "PE_config_addr" and the OS was required to use the ibm,get-config-addr-info RTAS call to find the correct PE address for the device. When support for the new interfaces was added to Linux it was implemented using something like: At probe time: pdn->eeh_config_addr = rtas_config_addr(pdn); pdn->eeh_pe_config_addr = rtas_get_config_addr_info(pdn); When performing an RTAS call: config_addr = pdn->eeh_config_addr; if (pdn->eeh_pe_config_addr) config_addr = pdn->eeh_pe_config_addr; rtas_call(..., config_addr, ...); In other words, if the ibm,get-config-addr-info RTAS call is implemented and returned a valid result we'd use that as the argument to the EEH RTAS calls. If not, Linux would fall back to using the device's config_addr. Over time these addresses have moved around going from pci_dn to eeh_dev and finally into eeh_pe. Today the users look like this: config_addr = pe->config_addr; if (pe->addr) config_addr = pe->addr; rtas_call(..., config_addr, ...); However, considering the EEH core always operates on a per-PE basis and even on pseries the only per-device operation is the initial call to ibm,set-eeh-option I'm not sure if any of this actually works on an RPA system today. It doesn't make much sense to have the fallback address in a generic structure either since the bulk of the code which reference it is in pseries anyway. The EEH core makes a token effort to support looking up a PE using the config_addr by having two arguments to eeh_pe_get(). However, a survey of all the callers to eeh_pe_get() shows that all bar one have the config_addr argument hard-coded to zero.The only caller that doesn't is in eeh_pe_tree_insert() which has: if (!eeh_has_flag(EEH_VALID_PE_ZERO) && !edev->pe_config_addr) return -EINVAL; pe = eeh_pe_get(hose, edev->pe_config_addr, edev->bdfn); The third argument (config_addr) is only used if the second (pe->addr) argument is invalid. The preceding check ensures that the call to eeh_pe_get() will never happen if edev->pe_config_addr is invalid so there is no situation where eeh_pe_get() will search for a PE based on the 3rd argument. The check also means that we'll never insert a PE into the tree where pe_config_addr is zero since EEH_VALID_PE_ZERO is never set on pseries. All the users of the fallback address on pseries never actually use the fallback and all the only caller that supplies something for the config_addr argument to eeh_pe_get() never use it either. It's all dead code. This patch removes the fallback address from eeh_pe since nothing uses it. Specificly, we do this by: 1) Removing pe->config_addr 2) Removing the EEH_VALID_PE_ZERO flag 3) Removing the fallback address argument to eeh_pe_get(). 4) Removing all the checks for pe->addr being zero in the pseries EEH code. This leaves us with PE's only being identified by what's in their pe->addr field and the EEH core relying on the platform to ensure that eeh_dev's are only inserted into the EEH tree if they're actually inside a PE. No functional changes, I hope. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200918093050.37344-9-oohall@gmail.com
* powerpc/eeh: Move EEH initialisation to an arch initcallOliver O'Halloran2020-10-061-32/+32
| | | | | | | | | | | | | | | | | | | | | | | | | | | | The initialisation of EEH mostly happens in a core_initcall_sync initcall, followed by registering a bus notifier later on in an arch_initcall. Anything involving initcall dependecies is mostly incomprehensible unless you've spent a while staring at code so here's the full sequence: ppc_md.setup_arch <-- pci_controllers are created here ...time passes... core_initcall <-- pci_dns are created from DT nodes core_initcall_sync <-- platforms call eeh_init() postcore_initcall <-- PCI bus type is registered postcore_initcall_sync arch_initcall <-- EEH pci_bus notifier registered subsys_initcall <-- PHBs are scanned here There's no real requirement to do the EEH setup at the core_initcall_sync level. It just needs to be done after pci_dn's are created and before we start scanning PHBs. Simplify the flow a bit by moving the platform EEH inititalisation to an arch_initcall so we can fold the bus notifier registration into eeh_init(). Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200918093050.37344-5-oohall@gmail.com
* powerpc/eeh: Delete eeh_ops->initOliver O'Halloran2020-10-061-8/+0
| | | | | | | | | No longer used since the platforms perform their EEH initialisation before calling eeh_init(). Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200918093050.37344-4-oohall@gmail.com
* powerpc/eeh: Rework EEH initialisationOliver O'Halloran2020-10-061-71/+16
| | | | | | | | | | | | | | Drop the EEH register / unregister ops thing and have the platform pass the ops structure into eeh_init() directly. This takes one initcall out of the EEH setup path and it means we're only doing EEH setup on the platforms which actually support it. It's also less code and generally easier to follow. No functional changes. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200918093050.37344-1-oohall@gmail.com
* powerpc/eeh: Rename eeh_{add_to|remove_from}_parent_pe()Oliver O'Halloran2020-07-261-2/+2
| | | | | | | | | | | | | | | The naming of eeh_{add_to|remove_from}_parent_pe() doesn't really reflect what they actually do. If the PE referred to be edev->pe_config_addr already exists under that PHB then the edev is added to that PE. However, if the PE doesn't exist the a new one is created for the edev. The bulk of the implementation of eeh_add_to_parent_pe() covers that second case. Similarly, most of eeh_remove_from_parent_pe() is determining when it's safe to delete a PE. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200725081231.39076-12-oohall@gmail.com
* powerpc/eeh: Remove spurious use of pci_dn in eeh_dump_dev_logOliver O'Halloran2020-07-261-10/+4
| | | | | | | | Retrieve the domain, bus, device, and function numbers from the edev. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200725081231.39076-10-oohall@gmail.com
* powerpc/eeh: Pass eeh_dev to eeh_ops->{read|write}_config()Oliver O'Halloran2020-07-261-12/+10
| | | | | | | | | Mechanical conversion of the eeh_ops interfaces to use eeh_dev to reference a specific device rather than pci_dn. No functional changes. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200725081231.39076-9-oohall@gmail.com
* powerpc/eeh: Pass eeh_dev to eeh_ops->restore_config()Oliver O'Halloran2020-07-261-3/+2
| | | | | | | | | Mechanical conversion of the eeh_ops interfaces to use eeh_dev to reference a specific device rather than pci_dn. No functional changes. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200725081231.39076-7-oohall@gmail.com
* powerpc/eeh: Remove VF config space restorationOliver O'Halloran2020-07-261-59/+0
| | | | | | | | | | | | | | | | | | | | | | | There's a bunch of strange things about this code. First up is that none of the fields being written to are functional for a VF. The SR-IOV specification lists then as "Reserved, but OS should preserve" so writing new values to them doesn't do anything and is clearly wrong from a correctness perspective. However, since VFs are designed to be managed by the OS there is an argument to be made that we should be saving and restoring some parts of config space. We already sort of do that by saving the first 64 bytes of config space in the eeh_dev (see eeh_dev->config_space[]). This is inadequate since it doesn't even consider saving and restoring the PCI capability structures. However, this is a problem with EEH in general and that needs to be fixed for non-VF devices too. There's no real reason to keep around this around so delete it. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200725081231.39076-6-oohall@gmail.com
* powerpc/eeh: Remove eeh_dev_phb_init_dynamic()Oliver O'Halloran2020-07-261-1/+1
| | | | | | | | | | | This function is a one line wrapper around eeh_phb_pe_create() and despite the name it doesn't create any eeh_dev structures. Replace it with direct calls to eeh_phb_pe_create() since that does what it says on the tin and removes a layer of indirection. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200725081231.39076-1-oohall@gmail.com
* powerpc/eeh: Release EEH device state synchronouslySam Bobroff2020-05-181-0/+31
| | | | | | | | | | | | | | | | | | | | EEH device state is currently removed (by eeh_remove_device()) during the device release handler, which is invoked as the device's reference count drops to zero. This may take some time, or forever, as other threads may hold references. However, the PCI device state is released synchronously by pci_stop_and_remove_bus_device(). This mismatch causes problems, for example the device may be re-discovered as a new device before the release handler has been called, leaving the PCI and EEH state mismatched. So instead, call eeh_remove_device() from the bus device removal handlers, which are called synchronously in the removal path. Signed-off-by: Sam Bobroff <sbobroff@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/0a1f5105d3a33b1c090bba31de63eb0cdd25de7b.1588045502.git.sbobroff@linux.ibm.com
* powerpc/eeh: Rework eeh_ops->probe()Oliver O'Halloran2020-03-251-21/+23
| | | | | | | | | | | | | | | | | | With the EEH early probe now being pseries specific there's no need for eeh_ops->probe() to take a pci_dn. Instead, we can make it take a pci_dev and use the probe function to map a pci_dev to an eeh_dev. This allows the platform to implement it's own method for finding (or creating) an eeh_dev for a given pci_dev which also removes a use of pci_dn in generic EEH code. This patch also renames eeh_device_add_late() to eeh_device_probe(). This better reflects what it does does and removes the last vestiges of the early/late EEH probe split. Reviewed-by: Sam Bobroff <sbobroff@linux.ibm.com> Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200306073904.4737-6-oohall@gmail.com
* powerpc/eeh: Make early EEH init pseries specificOliver O'Halloran2020-03-251-46/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | The eeh_ops->probe() function is called from two different contexts: 1. On pseries, where we set EEH_PROBE_MODE_DEVTREE, it's called in eeh_add_device_early() which is supposed to run before we create a pci_dev. 2. On PowerNV, where we set EEH_PROBE_MODE_DEV, it's called in eeh_device_add_late() which is supposed to run *after* the pci_dev is created. The "early" probe is required because PAPR requires that we perform an RTAS call to enable EEH support on a device before we start interacting with it via config space or MMIO. This requirement doesn't exist on PowerNV and shoehorning two completely separate initialisation paths into a common interface just results in a convoluted code everywhere. Additionally the early probe requires the probe function to take an pci_dn rather than a pci_dev argument. We'd like to make pci_dn a pseries specific data structure since there's no real requirement for them on PowerNV. To help both goals move the early probe into the pseries containment zone so the platform depedence is more explicit. Reviewed-by: Sam Bobroff <sbobroff@linux.ibm.com> Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200306073904.4737-5-oohall@gmail.com
* powerpc/eeh: Remove PHB check in probeOliver O'Halloran2020-03-251-6/+0
| | | | | | | | | | | | | | This check for a missing PHB has existing in various forms since the initial PPC64 port was upstreamed in 2002. The idea seems to be that we need to guard against creating pci-specific data structures for the non-pci children of a PCI device tree node (e.g. USB devices). However, we only create pci_dn structures for DT nodes that correspond to PCI devices so there's not much point in doing this check in the eeh_probe path. Reviewed-by: Sam Bobroff <sbobroff@linux.ibm.com> Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200306073904.4737-4-oohall@gmail.com
* powerpc/eeh: Remove eeh_add_device_tree_late()Oliver O'Halloran2020-03-251-25/+0
| | | | | | | | | | | | On pseries and PowerNV pcibios_bus_add_device() calls eeh_add_device_late() so there's no need to do a separate tree traversal to bind the eeh_dev and pci_dev together setting up the PHB at boot. As a result we can remove eeh_add_device_tree_late(). Reviewed-by: Sam Bobroff <sbobroff@linux.ibm.com> Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200306073904.4737-2-oohall@gmail.com
* powerpc/eeh: Add sysfs files in late probeOliver O'Halloran2020-03-251-23/+1
| | | | | | | | | | | | | | | | | | Move creating the EEH specific sysfs files into eeh_add_device_late() rather than being open-coded all over the place. Calling the function is generally done immediately after calling eeh_add_device_late() anyway. This is also a correctness fix since currently the sysfs files will be added even if the EEH probe happens to fail. Similarly, on pseries we currently add the sysfs files before calling eeh_add_device_late(). This is flat-out broken since the sysfs files require the pci_dev->dev.archdata.edev pointer to be set, and that is done in eeh_add_device_late(). Reviewed-by: Sam Bobroff <sbobroff@linux.ibm.com> Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200306073904.4737-1-oohall@gmail.com
* powerpc/eeh: Only dump stack once if an MMIO loop is detectedOliver O'Halloran2020-01-231-1/+1
| | | | | | | | | | | | | | | | | | | | | | Many drivers don't check for errors when they get a 0xFFs response from an MMIO load. As a result after an EEH event occurs a driver can get stuck in a polling loop unless it some kind of internal timeout logic. Currently EEH tries to detect and report stuck drivers by dumping a stack trace after eeh_dev_check_failure() is called EEH_MAX_FAILS times on an already frozen PE. The value of EEH_MAX_FAILS was chosen so that a dump would occur every few seconds if the driver was spinning in a loop. This results in a lot of spurious stack traces in the kernel log. Fix this by limiting it to printing one stack trace for each PE freeze. If the driver is truely stuck the kernel's hung task detector is better suited to reporting the probelm anyway. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Reviewed-by: Sam Bobroff <sbobroff@linux.ibm.com> Tested-by: Sam Bobroff <sbobroff@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20191016012536.22588-1-oohall@gmail.com
* powerpc/eeh_sysfs: Make clearing EEH_DEV_SYSFS sanerOliver O'Halloran2020-01-231-13/+17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | The eeh_sysfs_remove_device() function is supposed to clear the EEH_DEV_SYSFS flag since it indicates the EEH sysfs entries have been added for a pci_dev. When the sysfs files are removed eeh_remove_device() the eeh_dev and the pci_dev have already been de-associated. This then causes the pci_dev_to_eeh_dev() call in eeh_sysfs_remove_device() to return NULL so the flag can't be cleared from the still-live eeh_dev. This problem is worked around in the caller by clearing the flag manually. However, this behaviour doesn't make a whole lot of sense, so this patch fixes it by: a) Re-ordering eeh_remove_device() so that eeh_sysfs_remove_device() is called before de-associating the pci_dev and eeh_dev. b) Making eeh_sysfs_remove_device() emit a warning if there's no corresponding eeh_dev for a pci_dev. The paths where the sysfs files are only reachable if EEH was setup for the device for the device in the first place so hitting this warning indicates a programming error. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Reviewed-by: Sam Bobroff <sbobroff@linux.ibm.com> Tested-by: Sam Bobroff <sbobroff@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190715085612.8802-6-oohall@gmail.com
* powerpc/eeh: Fix eeh eeh_debugfs_break_device() with SRIOV devicesOliver O'Halloran2019-09-271-2/+2
| | | | | | | | | | | | s/CONFIG_IOV/CONFIG_PCI_IOV/ Whoops. Fixes: bd6461cc7b3c ("powerpc/eeh: Add a eeh_dev_break debugfs interface") Signed-off-by: Oliver O'Halloran <oohall@gmail.com> [mpe: Fixup the #endif comment as well] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190926122502.14826-1-oohall@gmail.com
* powerpc/eeh: Add a eeh_dev_break debugfs interfaceOliver O'Halloran2019-09-051-1/+138
| | | | | | | | | | | | | | | | | | Add an interface to debugfs for generating an EEH event on a given device. This works by disabling memory accesses to and from the device by setting the PCI_COMMAND register (or the VF Memory Space Enable on the parent PF). This is a somewhat portable alternative to using the platform specific error injection mechanisms since those tend to be either hard to use, or straight up broken. For pseries the interfaces also requires the use of /dev/mem which is probably going to go away in a post-LOCKDOWN world (and it's a horrific hack to begin with) so moving to a kernel-provided interface makes sense and provides a sane, cross-platform interface for userspace so we can write more generic testing scripts. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190903101605.2890-14-oohall@gmail.com
* powerpc/eeh: Add debugfs interface to run an EEH checkOliver O'Halloran2019-09-051-0/+61
| | | | | | | | | | | | | | | | | | | | | | | | Detecting an frozen EEH PE usually occurs when an MMIO load returns a 0xFFs response. When performing EEH testing using the EEH error injection feature available on some platforms there is no simple way to kick-off the kernel's recovery process since any accesses from userspace (usually /dev/mem) will bypass the MMIO helpers in the kernel which check if a 0xFF response is due to an EEH freeze or not. If a device contains a 0xFF byte in it's config space it's possible to trigger the recovery process via config space read from userspace, but this is not a reliable method. If a driver is bound to the device an in use it will frequently trigger the MMIO check, but this is also inconsistent. To solve these problems this patch adds a debugfs file called "eeh_dev_check" which accepts a <domain>:<bus>:<dev>.<fn> string and runs eeh_dev_check_failure() on it. This is the same check that's done when the kernel gets a 0xFF result from an config or MMIO read with the added benifit that it can be reliably triggered from userspace. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190903101605.2890-13-oohall@gmail.com
* powerpc/eeh: Defer printing stack traceOliver O'Halloran2019-09-051-11/+4
| | | | | | | | | | | | | | | | | | Currently we print a stack trace in the event handler to help with debugging EEH issues. In the case of suprise hot-unplug this is unneeded, so we want to prevent printing the stack trace unless we know it's due to an actual device error. To accomplish this, we can save a stack trace at the point of detection and only print it once the EEH recovery handler has determined the freeze was due to an actual error. Since the whole point of this is to prevent spurious EEH output we also move a few prints out of the detection thread, or mark them as pr_debug so anyone interested can get output from the eeh_check_dev_failure() if they want. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190903101605.2890-6-oohall@gmail.com
* powerpc/eeh: Remove unused return path from eeh_pe_dev_traverse()Sam Bobroff2019-08-221-11/+5
| | | | | | | | | There are no users of the early-out return value from eeh_pe_dev_traverse(), so remove it. Signed-off-by: Sam Bobroff <sbobroff@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/c648070f5b28fe8ca1880b48e64b267959ffd369.1565930772.git.sbobroff@linux.ibm.com
* powerpc/eeh: Convert log messages to eeh_edev_* macrosSam Bobroff2019-08-221-11/+8
| | | | | | | | | | | | | | | | | | Convert existing messages, where appropriate, to use the eeh_edev_* logging macros. The only effect should be minor adjustments to the log messages, apart from: - A new message in pseries_eeh_probe() "Probing device" to match the powernv case. - The "Probing device" message in pnv_eeh_probe() is now generated slightly later, which will mean that it is no longer emitted for devices that aren't probed due to the initial checks. Signed-off-by: Sam Bobroff <sbobroff@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/ce505a0a7a4a5b0367f0f40f8b26e7c0a9cf4cb7.1565930772.git.sbobroff@linux.ibm.com
* powerpc/eeh: Refactor around eeh_probe_devices()Sam Bobroff2019-08-221-17/+10
| | | | | | | | | | | | | | | | | Now that EEH support for all devices (on PowerNV and pSeries) is provided by the pcibios bus add device hooks, eeh_probe_devices() and eeh_addr_cache_build() are redundant and can be removed. Move the EEH enabled message into it's own function so that it can be called from multiple places. Note that previously on pSeries, useless EEH sysfs files were created for some devices that did not have EEH support and this change prevents them from being created. Signed-off-by: Sam Bobroff <sbobroff@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/33b0a6339d5ac88693de092d6fba984f2a5add66.1565930772.git.sbobroff@linux.ibm.com
* powerpc/eeh: EEH for pSeries hot plugSam Bobroff2019-08-221-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | On PowerNV and pSeries, devices currently acquire EEH support from several different places: Boot-time devices from eeh_probe_devices() and eeh_addr_cache_build(), Virtual Function devices from the pcibios bus add device hooks and hot plugged devices from pci_hp_add_devices() (with other platforms using other methods as well). Unfortunately, pSeries machines currently discover hot plugged devices using pci_rescan_bus(), not pci_hp_add_devices(), and so those devices do not receive EEH support. Rather than adding another case for pci_rescan_bus(), this change widens the scope of the pcibios bus add device hooks so that they can handle all devices. As a side effect this also supports devices discovered after manually rescanning via /sys/bus/pci/rescan. Note that on PowerNV, this change allows the EEH subsystem to become enabled after boot as long as it has not been forced off, which was not previously possible (it was already possible on pSeries). Signed-off-by: Sam Bobroff <sbobroff@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/72ae8ae9c54097158894a52de23690448de38ea9.1565930772.git.sbobroff@linux.ibm.com
* powerpc/eeh: Initialize EEH address cache earlierSam Bobroff2019-08-221-0/+2
| | | | | | | | | | | | | | | | | | | The EEH address cache is currently initialized and populated by a single function: eeh_addr_cache_build(). While the initial population of the cache can only be done once resources are allocated, initialization (just setting up a spinlock) could be done much earlier. So move the initialization step into a separate function and call it from a core_initcall (rather than a subsys initcall). This will allow future work to make use of the cache during boot time PCI scanning. Signed-off-by: Sam Bobroff <sbobroff@linux.ibm.com> Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/0557206741bffee76cdfff042f65321f6f7a5b41.1565930772.git.sbobroff@linux.ibm.com
* powerpc/eeh: Improve debug messages around device additionSam Bobroff2019-08-221-1/+1
| | | | | | | | | Also remove useless comment. Signed-off-by: Sam Bobroff <sbobroff@linux.ibm.com> Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/59db84f4bf94718a12f206bc923ac797d47e4cc1.1565930772.git.sbobroff@linux.ibm.com
* Merge tag 'powerpc-5.3-1' of ↵Linus Torvalds2019-07-141-3/+12
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux Pull powerpc updates from Michael Ellerman: "Notable changes: - Removal of the NPU DMA code, used by the out-of-tree Nvidia driver, as well as some other functions only used by drivers that haven't (yet?) made it upstream. - A fix for a bug in our handling of hardware watchpoints (eg. perf record -e mem: ...) which could lead to register corruption and kernel crashes. - Enable HAVE_ARCH_HUGE_VMAP, which allows us to use large pages for vmalloc when using the Radix MMU. - A large but incremental rewrite of our exception handling code to use gas macros rather than multiple levels of nested CPP macros. And the usual small fixes, cleanups and improvements. Thanks to: Alastair D'Silva, Alexey Kardashevskiy, Andreas Schwab, Aneesh Kumar K.V, Anju T Sudhakar, Anton Blanchard, Arnd Bergmann, Athira Rajeev, Cédric Le Goater, Christian Lamparter, Christophe Leroy, Christophe Lombard, Christoph Hellwig, Daniel Axtens, Denis Efremov, Enrico Weigelt, Frederic Barrat, Gautham R. Shenoy, Geert Uytterhoeven, Geliang Tang, Gen Zhang, Greg Kroah-Hartman, Greg Kurz, Gustavo Romero, Krzysztof Kozlowski, Madhavan Srinivasan, Masahiro Yamada, Mathieu Malaterre, Michael Neuling, Nathan Lynch, Naveen N. Rao, Nicholas Piggin, Nishad Kamdar, Oliver O'Halloran, Qian Cai, Ravi Bangoria, Sachin Sant, Sam Bobroff, Satheesh Rajendran, Segher Boessenkool, Shaokun Zhang, Shawn Anastasio, Stewart Smith, Suraj Jitindar Singh, Thiago Jung Bauermann, YueHaibing" * tag 'powerpc-5.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (163 commits) powerpc/powernv/idle: Fix restore of SPRN_LDBAR for POWER9 stop state. powerpc/eeh: Handle hugepages in ioremap space ocxl: Update for AFU descriptor template version 1.1 powerpc/boot: pass CONFIG options in a simpler and more robust way powerpc/boot: add {get, put}_unaligned_be32 to xz_config.h powerpc/irq: Don't WARN continuously in arch_local_irq_restore() powerpc/module64: Use symbolic instructions names. powerpc/module32: Use symbolic instructions names. powerpc: Move PPC_HA() PPC_HI() and PPC_LO() to ppc-opcode.h powerpc/module64: Fix comment in R_PPC64_ENTRY handling powerpc/boot: Add lzo support for uImage powerpc/boot: Add lzma support for uImage powerpc/boot: don't force gzipped uImage powerpc/8xx: Add microcode patch to move SMC parameter RAM. powerpc/8xx: Use IO accessors in microcode programming. powerpc/8xx: replace #ifdefs by IS_ENABLED() in microcode.c powerpc/8xx: refactor programming of microcode CPM params. powerpc/8xx: refactor printing of microcode patch name. powerpc/8xx: Refactor microcode write powerpc/8xx: refactor writing of CPM microcode arrays ...
| * powerpc/eeh: Handle hugepages in ioremap spaceOliver O'Halloran2019-07-111-3/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In commit 4a7b06c157a2 ("powerpc/eeh: Handle hugepages in ioremap space") support for using hugepages in the vmalloc and ioremap areas was enabled for radix. Unfortunately this broke EEH MMIO error checking. Detection works by inserting a hook which checks the results of the ioreadXX() set of functions. When a read returns a 0xFFs response we need to check for an error which we do by mapping the (virtual) MMIO address back to a physical address, then mapping physical address to a PCI device via an interval tree. When translating virt -> phys we currently assume the ioremap space is only populated by PAGE_SIZE mappings. If a hugepage mapping is found we emit a WARN_ON(), but otherwise handles the check as though a normal page was found. In pathalogical cases such as copying a buffer containing a lot of 0xFFs from BAR memory this can result in the system not booting because it's too busy printing WARN_ON()s. There's no real reason to assume huge pages can't be present and we're prefectly capable of handling them, so do that. Fixes: 4a7b06c157a2 ("powerpc/eeh: Handle hugepages in ioremap space") Reported-by: Sachin Sant <sachinp@linux.vnet.ibm.com> Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Tested-by: Sachin Sant <sachinp@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190710150517.27114-1-oohall@gmail.com
* | treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156Thomas Gleixner2019-05-301-14/+1
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* powerpc/eeh: Add eeh_force_recover to debugfsOliver O'Halloran2019-02-211-0/+59
| | | | | | | | | | | | | | | | This patch adds a debugfs interface to force scheduling a recovery event. This can be used to recover a specific PE or schedule a "special" recovery even that checks for errors at the PHB level. To force a recovery of a normal PE, use: echo '<#pe>:<#phb>' > /sys/kernel/debug/powerpc/eeh_force_recover To force a scan for broken PHBs: echo 'hwcheck' > /sys/kernel/debug/powerpc/eeh_force_recover Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* powerpc/eeh: Allow disabling recoveryOliver O'Halloran2019-02-211-0/+10
| | | | | | | | | | Currently when we detect an error we automatically invoke the EEH recovery handler. This can be annoying when debugging EEH problems, or when working on EEH itself so this patch adds a debugfs knob that will prevent a recovery event from being queued up when an issue is detected. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* powerpc/eeh_cache: Add a way to dump the EEH address cacheOliver O'Halloran2019-02-211-0/+1
| | | | | | | | | | | | Adds a debugfs file that can be read to view the contents of the EEH address cache. This is pretty similar to the existing eeh_addr_cache_print() function, but that function is intended to debug issues inside of the kernel since it's #ifdef`ed out by default, and writes into the kernel log. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Reviewed-by: Sam Bobroff <sbobroff@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* powerpc/eeh: Use debugfs_create_u32 for eeh_max_freezesOliver O'Halloran2019-02-211-18/+3
| | | | | | | | | | | There's no need to the custom getter/setter functions so we should remove them in favour of using the generic one. While we're here, change the type of eeh_max_freeze to u32 and print the value in decimal rather than hex because printing it in hex makes no sense. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Reviewed-by: Sam Bobroff <sbobroff@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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