- 27 Jul, 2021 40 commits
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Heiko Carstens authored
Remove a leftover from the common 31/64 bit code. z/Architecture mode is now always active, there is no need to check. Signed-off-by:Heiko Carstens <hca@linux.ibm.com>
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Heiko Carstens authored
Use a consistent coding style within setup_hwcaps() and remove obvious and outdated comments. Signed-off-by: -
Heiko Carstens authored
The first six hwcap bits are initialized in a rather odd way: an array contains the stfl(e) bits which need to be set, so that the corresponding bit position (= array index) within hwcaps are set. Better open code it like it is done for all other bits, making it obvious which bit is set when. Signed-off-by: -
Heiko Carstens authored
setup_hwcaps() is a quite large function. Make it smaller by moving the elf platform setup code into an independent setup function. Signed-off-by: -
Heiko Carstens authored
Move setup_hwcaps() to processor.c for two reasons: - make setup.c a bit smaller - have allmost all of the hwcap code in one file Signed-off-by: -
Heiko Carstens authored
Add BUILD_BUG_ON() sanity checks to make sure the hwcap string array contains a string for each hwcap. Signed-off-by: -
Heiko Carstens authored
Use named initializers to make it obvious which hwcap string array element belongs to which hwcap. Signed-off-by: -
Heiko Carstens authored
Introduce HWCAP bit numbers, making it easier to tell at which bit number we currently are. Also use these bits with the BIT macro to define the real HWCAP masks. Signed-off-by: -
Heiko Carstens authored
Remove s390 part of all HWCAP defines, just to make them shorter and easier to handle. The namespace is anyway per architecture. This is similar to what arm64 has. Signed-off-by: -
Niklas Schnelle authored
In order to support the use of enhanced PCI instructions in both kernel- and userspace we need both hardware support and proper setup in the kernel. The latter can be toggled off with the pci=nomio command line option. Thus availability of this feature in userspace depends on all of kernel configuration (CONFIG_PCI), hardware support and the current kernel command line and can thus not rely solely on a facility bit. Instead let's introduce a new ELF hardware capability bit HWCAP_S390_PCI_MIO to tell userspace whether these PCI instructions can be used. Reviewed-by:
Niklas Schnelle <schnelle@linux.ibm.com> Signed-off-by:
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Niklas Schnelle authored
Kernel support for the newer PCI mio instructions can be toggled off with the pci=nomio command line option which needs to integrate with common code PCI option parsing. However this option then toggles static branches which can't be toggled yet in an early_param() call. Thus commit 9964f396 ("s390: fix setting of mio addressing control") moved toggling the static branches to the PCI init routine. With this setup however we can't check for mio support outside the PCI code during early boot, i.e. before switching the static branches, which we need to be able to export this as an ELF HWCAP. Improve on this by turning mio availability into a machine flag that gets initially set based on CONFIG_PCI and the facility bit and gets toggled off if pci=nomio is found during PCI option parsing allowing simple access to this machine flag after early init. Reviewed-by:
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Heiko Carstens authored
Add more instructions to the kernel disassembler. Signed-off-by: -
Heiko Carstens authored
Add hardware capability bits and feature tags to /proc/cpuinfo for NNPA and Vector-Packed-Decimal-Enhancement Facility 2. Signed-off-by: -
Julian Wiedmann authored
These macros haven't seen any use in a long time. Also note that the queue_irqs_*() ones wouldn't even compile anymore. Signed-off-by:
Julian Wiedmann <jwi@linux.ibm.com> Reviewed-by:
Benjamin Block <bblock@linux.ibm.com> Signed-off-by:
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Julian Wiedmann authored
Now that all drivers use qdio_inspect_queue() and qdio's internal queue tasklets are gone, the driver-specified queue handlers are only called for async error reporting (eg. for an error condition in the QEBSM code). So take a moment to clean up the Output Queue handlers (they are _always_ called with qdio_error != 0), and clarify which error types can be reported through what interface. As Benjamin already suggested a while ago, we should turn these into distinct enums at some point. Signed-off-by:
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Julian Wiedmann authored
get_outbound_buffer_frontier() is only reached via qdio_inspect_queue(), and there we already call qdio_siga_sync_q() unconditionally. Signed-off-by:
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Julian Wiedmann authored
Both qdio drivers have moved away from using qdio's internal tasklet and timer mechanisms for Output Queues. Rip out all the leftovers. Signed-off-by:
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Julian Wiedmann authored
If qdio_cancel_ccw() times out (or is interrupted) before the interrupt for the {halt,clear} action arrives, report this back to the caller as an error. Signed-off-by: -
Julian Wiedmann authored
If the ESTABLISH ccw fails (ie. the qdio_irq is set to QDIO_IRQ_STATE_ERR), we don't need to call qdio_shutdown() for rolling back our earlier actions. All the needed logic is already available in qdio_establish()'s error chain, and using it means we don't have to temporarily drop the setup_mutex either. This makes qdio_shutdown() a purely external function, that should only be called by the driver if an earlier qdio_establish() succeeded. Signed-off-by:
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Julian Wiedmann authored
When the ESTABLISH ccw does not complete within the specified timeout, try our best to cancel the ccw program that is still active on the device. Otherwise the IO subsystem might be accessing it even after the driver eg. called qdio_free(). Fixes: 779e6e1c ("[S390] qdio: new qdio driver.") Signed-off-by:
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Julian Wiedmann authored
When qdio_establish() times out while waiting for the ESTABLISH ccw to complete, it calls qdio_shutdown() to roll back all of its previous actions. But at this point the qdio_irq's state is still QDIO_IRQ_STATE_INACTIVE, so qdio_shutdown() will exit immediately without doing any actual work. Which means that eg. the qdio_irq's thinint-indicator stays registered, and cdev->handler isn't restored to its old value. And since commit 954d6235 ("s390/qdio: make thinint registration symmetric") the qdio_irq also stays on the tiq_list, so on the next qdio_establish() we might get a helpful BUG from the list-debugging code: ... [ 4633.512591] list_add double add: new=00000000005a4110, prev=00000001b357db78, next=00000000005a4110. [ 4633.512621] ------------[ cut here ]------------ [ 4633.512623] kernel BUG at lib/list_debug.c:29! ... [ 4633.512796] [<00000001b2c6ee9a>] __list_add_valid+0x82/0xa0 [ 4633.512798] ([<00000001b2c6ee96>] __list_add_valid+0x7e/0xa0) [ 4633.512800] [<00000001b2fcecce>] qdio_establish_thinint+0x116/0x190 [ 4633.512805] [<00000001b2fcbe58>] qdio_establish+0x128/0x498 ... Fix this by extracting a goto-chain from the existing error exits in qdio_establish(), and check the return value of the wait_event_...() to detect the timeout condition. Fixes: 779e6e1c ("[S390] qdio: new qdio driver.") Root-caused-by:
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Alexander Egorenkov authored
There is no useful information within [STARTUP_NORMAL_OFFSET, HEAD_END] now. But the memory region [0, STARTUP_NORMAL_OFFSET] is used by: * lowcore * kdump for swapping memory * stand-alone zipl dumpers for code, data, stack and heap Signed-off-by:
Alexander Egorenkov <egorenar@linux.ibm.com> Acked-by:
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Alexander Egorenkov authored
This change simplifies the task of making the decompressor relocatable. The decompressor's image contains special DMA sections between _sdma and _edma. This DMA segment is loaded at boot as part of the decompressor and then simply handed over to the decompressed kernel. The decompressor itself never uses it in any way. The primary reason for this is the need to keep the aforementioned DMA segment below 2GB which is required by architecture, and because the decompressor is always loaded at a fixed low physical address, it is guaranteed that the DMA region will not cross the 2GB memory limit. If the DMA region had been placed in the decompressed kernel, then KASLR would make this guarantee impossible to fulfill or it would be restricted to the first 2GB of memory address space. This commit moves all DMA sections between _sdma and _edma from the decompressor's image to the decompressed kernel's image. The complete DMA region is placed in the init section of the decompressed kernel and immediately relocated below 2GB at start-up before it is needed by other parts of the decompressed kernel. The relocation of the DMA region happens even if the decompressed kernel is already located below 2GB in order to keep the first implementation simple. The relocation should not have any noticeable impact on boot time because the DMA segment is only a couple of pages. After relocating the DMA sections, the kernel has to fix all references which point into it. In order to automate this, place all variables pointing into the DMA sections in a special .dma.refs section. All such variables must be defined using the new __dma_ref macro. Only variables containing addresses within the DMA sections must be placed in the new .dma.refs section. Furthermore, move the initialization of control registers from the decompressor to the decompressed kernel because some control registers reference tables that must be placed in the DMA data section to guarantee that their addresses are below 2G. Because the decompressed kernel relocates the DMA sections at startup, the content of control registers CR2, CR5 and CR15 must be updated with new addresses after the relocation. The decompressed kernel initializes all control registers early at boot and then updates the content of CR2, CR5 and CR15 as soon as the DMA relocation has occurred. This practically reverts the commit a80313ff ("s390/kernel: introduce .dma sections"). Signed-off-by:
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Heiko Carstens authored
Signed-off-by: -
Alexander Egorenkov authored
As a preparation for moving the .dma.data section from the decompressor to the decompressed kernel, the .dma.data section must be made relocatable by replacing absolute memory addressing with relative one. This is required in order to be able to relocate the DMA section to a memory address <= 2G as required by the hardware architecture. The DMA section must be relocated in case the decompressed kernel was loaded to an address >= 2G which can occur if KASAN is enabled. By making the whole DMA section position-independent we avoid applying relocations to it whenever it is moved to a different address, which becomes possible as soon as it becomes a part of the decompressed kernel. Signed-off-by:
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Alexander Egorenkov authored
Both macros are used only in decompressor's head.S, unnecessary to put them in a global header used in many places like setup.h is. Signed-off-by:
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Alexander Egorenkov authored
To reduce duplication, replace error-prone and hard-coded parameter area offsets with auto-generated ones. Signed-off-by:
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Alexander Egorenkov authored
The macros * IPL_DEVICE_OFFSET * INITRD_START_OFFSET * INITRD_SIZE_OFFSET * OLDMEM_BASE_OFFSET * OLDMEM_SIZE_OFFSET * KERNEL_VERSION_OFFSET * COMMAND_LINE_OFFSET are no longer necessary and used only to define another set of macros with the same names but w/o the suffix _OFFSET. Therefore, drop this unnecessary indirection. Drop the macro KERNEL_VERSION_OFFSET w/o renaming it to KERNEL_VERSION because it is used nowhere. Signed-off-by:
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Alexander Egorenkov authored
These symbolic constants are used only by assembler code now: * COMMAND_LINE * IPL_DEVICE C code of the decompressed kernel should use boot data passed by the decompressor instead. Signed-off-by:
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Alexander Egorenkov authored
The new boot data struct shall replace global variables OLDMEM_BASE and OLDMEM_SIZE. It is initialized in the decompressor and passed to the decompressed kernel. In comparison to the old solution, this one doesn't access data at fixed physical addresses which will become important when the decompressor becomes relocatable. Signed-off-by:
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Alexander Egorenkov authored
The new boot data struct shall replace global variables INITRD_START and INITRD_SIZE. It is initialized in the decompressor and passed to the decompressed kernel. In comparison to the old solution, this one doesn't access data at fixed physical addresses which will become important when the decompressor becomes relocatable. Signed-off-by:
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Alexander Egorenkov authored
To make the decompressor relocatable, the early SCLP buffer with a fixed address must be replaced with a relocatable C buffer of the according size and alignment as required by SCLP. Introduce a new function sclp_early_set_buffer() into the SCLP driver which enables the decompressor to change the SCLP early buffer at any time. This will be useful when the decompressor becomes fully relocatable and might need to change the SCLP early buffer to one with an address < 2G as required by SCLP because it was loaded at an address >= 2G. Signed-off-by:
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Alexander Egorenkov authored
Use STARTUP_NORMAL_OFFSET and STARTUP_KDUMP_OFFSET instead of magic numbers. Signed-off-by:
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Heiko Carstens authored
Use system call functions instead of open-coding svc inline assemblies. This is mostly to get rid of even more register asm constructs. Besides that, it makes the code also a bit easier to understand. The generated code is identical to what is was before. Reviewed-by:
Sven Schnelle <svens@linux.ibm.com> Signed-off-by:
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Heiko Carstens authored
Provide generic system call functions which should be used whenever a system call needs to be done from user space. The only in-kernel code is vdso, which will be converted with a follow on patch. Reviewed-by:
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Heiko Carstens authored
Using register asm statements has been proven to be very error prone, especially when using code instrumentation where gcc may add function calls, which clobbers register contents in an unexpected way. Therefore get rid of register asm statements in cpacf code, and make sure this bug class cannot happen. Reviewed-by:
Patrick Steuer <patrick.steuer@de.ibm.com> Signed-off-by:
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Heiko Carstens authored
Remove unused print defines from debug feature header file. Signed-off-by: -
Heiko Carstens authored
Remove dasd ioctl debug printk which seems to be a leftover from the very early days. At least it seems to be quite pointless. Reviewed-by:
Stefan Haberland <sth@linux.ibm.com> Signed-off-by:
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Alexander Egorenkov authored
De-duplicate checks for Protected Host Virtualization in decompressor and kernel. Set prot_virt_host=0 in the decompressor in *any* of the following cases and hand it over to the decompressed kernel: * No explicit prot_virt=1 is given on the kernel command-line * Protected Guest Virtualization is enabled * Hardware support not present * kdump or stand-alone dump The decompressed kernel needs to use only is_prot_virt_host() instead of performing again all checks done by the decompressor. Signed-off-by:
Vasily Gorbik <gor@linux.ibm.com> Signed-off-by:
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Alexander Egorenkov authored
A dump kernel is neither required nor able to support Secure Execution. Signed-off-by:
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