- 04 May, 2011 5 commits
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Paul Mackerras authored
Recent 64-bit server processors (POWER6 and POWER7) have a "Come-From Address Register" (CFAR), that records the address of the most recent branch or rfid (return from interrupt) instruction for debugging purposes. This saves the value of the CFAR in the exception entry code and stores it in the exception frame. We also make xmon print the CFAR value in its register dump code. Rather than extend the pt_regs struct at this time, we steal the orig_gpr3 field, which is only used for system calls, and use it for the CFAR value for all exceptions/interrupts other than system calls. This means we don't save the CFAR on system calls, which is not a great problem since system calls tend not to happen unexpectedly, and also avoids adding the overhead of reading the CFAR to the system call entry path. Signed-off-by:
Paul Mackerras <paulus@samba.org> Signed-off-by:
Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Paul Mackerras authored
When we take an interrupt or exception from kernel mode and the stack pointer is obviously not a kernel address (i.e. the top bit is 0), we switch to an emergency stack, save register values and panic. However, on 64-bit server machines, we don't actually save the values of r9 - r13 at the time of the interrupt, but rather values corrupted by the exception entry code for r12-r13, and nothing at all for r9-r11. This fixes it by passing a pointer to the register save area in the paca through to the bad_stack code in r3. The register values are saved in one of the paca register save areas (depending on which exception this is). Using the pointer in r3, the bad_stack code now retrieves the saved values of r9 - r13 and stores them in the exception frame on the emergency stack. This also stores the normal exception frame marker ("regshere") in the exception frame. Signed-off-by: -
Tseng-Hui (Frank) Lin authored
Icswx is a PowerPC instruction to send data to a co-processor. On Book-S processors the LPAR_ID and process ID (PID) of the owning process are registered in the window context of the co-processor at initialization time. When the icswx instruction is executed the L2 generates a cop-reg transaction on PowerBus. The transaction has no address and the processor does not perform an MMU access to authenticate the transaction. The co-processor compares the LPAR_ID and the PID included in the transaction and the LPAR_ID and PID held in the window context to determine if the process is authorized to generate the transaction. The OS needs to assign a 16-bit PID for the process. This cop-PID needs to be updated during context switch. The cop-PID needs to be destroyed when the context is destroyed. Signed-off-by:
Sonny Rao <sonnyrao@linux.vnet.ibm.com> Signed-off-by:
Tseng-Hui (Frank) Lin <thlin@linux.vnet.ibm.com> Signed-off-by:
Anton Blanchard <anton@samba.org> Signed-off-by:
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Michael Neuling authored
This removes MMU_FTR_TLBIE_206 as we can now use CPU_FTR_HVMODE_206. It also changes the logic to select which tlbie to use to be based on this new CPU feature bit. This also duplicates the ASM_FTR_IF/SET/CLR defines for CPU features (copied from MMU features). Signed-off-by:
Michael Neuling <mikey@neuling.org> Signed-off-by:
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Grant Likely authored
First step in eliminating irq_map[] table entirely Signed-off-by:
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- 27 Apr, 2011 22 commits
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Richard A. Lary authored
Added support for ibm,configure-pe RTAS call introduced with PAPR 2.2. Signed-off-by:
Richard A. Lary <rlary@linux.vnet.ibm.com> Signed-off-by:
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Matt Evans authored
Some of the 64bit PPC CPU features are MMU-related, so this patch moves them to MMU_FTR_ bits. All cpu_has_feature()-style tests are moved to mmu_has_feature(), and seven feature bits are freed as a result. Signed-off-by:
Matt Evans <matt@ozlabs.org> Signed-off-by:
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Anton Blanchard authored
RTAS returns extended error codes as a hint of how long the OS might want to wait before retrying a call. If we have nothing else useful to do we may as well call back straight away. This was found when testing the new dynamic dma window feature. Firmware split the zeroing of the TCE table into 32k chunks but returned 9901 (which is a suggested wait of 10ms). All up this took about 10 minutes to complete since msleep is jiffies based and will round 10ms up to 20ms. With the patch below we take 3 seconds to complete the same test. The hint firmware is returning in the RTAS call should definitely be decreased, but even if we slept 1ms each iteration this would take 32s. Signed-off-by:
Nishanth Aravamudan <nacc@us.ibm.com> Signed-off-by:
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Michael Ellerman authored
The calculation of the size for the exception save area of the TLB miss handler is wrong, luckily it's too big not too small. Rework it to make it a bit clearer, and also correct. We want 3 save areas, each EX_TLB_SIZE _bytes_. Signed-off-by:
Michael Ellerman <michael@ellerman.id.au> Acked-by:
Kumar Gala <galak@kernel.crashing.org> Signed-off-by:
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Michael Ellerman authored
We check MSR_SF a lot in sstep.c, to decide if we need to emulate the truncation of values when running in 32-bit mode. Factor out that code into a helper, and convert it and the other uses to use MSR_64BIT. This fixes a bug on BOOK3E where kprobes would end up returning to a 32-bit address, because regs->nip was truncated, because (msr & MSR_SF) was false. Signed-off-by:
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Michael Ellerman authored
Use the new MSR_64BIT in a few places. Some of these are already ifdef'ed for BOOKE vs BOOKS, but it's still clearer, MSR_SF does not immediately parse as "MSR bit for 64bit". Signed-off-by:
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Michael Ellerman authored
The MSR bit which indicates 64-bit-ness is different between server and booke, so add a #define which gives you the right mask regardless. Signed-off-by:
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Wanlong Gao authored
BT_L2CAP and BT_SCO have changed to bool . Value 'm' has invalid . Signed-off-by:
Wanlong Gao <wanlong.gao@gmail.com> Signed-off-by:
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Geert Uytterhoeven authored
commit ec775d0e ("powerpc: Convert to new irq_* function names") changed a call from set_irq_chip_data() to irq_set_chip_data(), but forgot to update the corresponding debug message Signed-off-by:
Geert Uytterhoeven <geert@linux-m68k.org> Acked-by:
Geoff Levand <geoff@infradead.org> Signed-off-by:
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Michael Ellerman authored
This can be useful for differentiating interrupts on the same host but with different chip data. Signed-off-by:
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Michael Ellerman authored
If we don't find ibm,associativity-reference-points as a child of /rtas, look for it at the root of the tree instead. We use this on Book3E where we have no RTAS but still use the sPAPR conventions for NUMA. Signed-off-by:
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Michael Ellerman authored
Even when no initfunc is provided. Signed-off-by:
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Michael Ellerman authored
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Michael Ellerman authored
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Michael Ellerman authored
The goal is to avoid adding overhead to MMIO when only PIO is needed Signed-off-by:
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Nishanth Aravamudan authored
Commit fe3cc0d9 ("powerpc: Add pgprot_writecombine") in benh's tree exposes the pgprot_writecombine() API to drivers on powerpc. cxgb4 has an open-coded version of the same, so use the common API now that it's available. Signed-off-by:
Steve Wise <swise@opengridcomputing.com> Signed-off-by:
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Alexey Kardashevskiy authored
The DSCR (aka Data Stream Control Register) is supported on some server PowerPC chips and allow some control over the prefetch of data streams. This patch allows the value to be specified per thread by emulating the corresponding mfspr and mtspr instructions. Children of such threads inherit the value. Other threads use a default value that can be specified in sysfs - /sys/devices/system/cpu/dscr_default. If a thread starts with non default value in the sysfs entry, all children threads inherit this non default value even if the sysfs value is changed later. Signed-off-by:
Alexey Kardashevskiy <aik@au1.ibm.com> Signed-off-by:
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Jack Miller authored
When we set up the TLB for ourselves on Book3E, we need to flush out any old mappings established by the firmware or bootloader. At present we attempt this with a tlbilx to flush everything, but this will leave behind any entries with the IPROT bit set. There are several good reason firmware might establish mappings with IPROT, and in fact ePAPR compliant firmwares are required to establish their initial mapped area with IPROT. This patch, therefore adds more complex code to scan through the TLB upon entry and flush away any entries that are not our own. Signed-off-by:
Jack Miller <jack@codezen.org> Signed-off-by:
David Gibson <david@gibson.dropbear.id.au> Signed-off-by:
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Benjamin Herrenschmidt authored
An erratum on A2 can lead to the bolted entry we insert for the linear mapping being evicted, to avoid that write the bolted entry to way 3. Signed-off-by:
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Michael Ellerman authored
In exc_lvl_ctx_init() we index into the crit/dbg/mcheck stacks using the hard cpu id, but that assumes the hard cpu id is zero based and contiguous. That is not the case on A2. The root of the problem is that the 32bit code has no equivalent of the paca to allow it to do the hard->soft mapping in assembler. Until the 32bit code is updated to handle that, index the stacks using the soft cpu ids on 64bit and hard on 32 bit. Signed-off-by:
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Benjamin Herrenschmidt authored
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Benjamin Herrenschmidt authored
Add the cputable entry, regs and setup & restore entries for the PowerPC A2 core. Signed-off-by:
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- 20 Apr, 2011 13 commits
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Benjamin Herrenschmidt authored
As well as searching for nodes with type = "nvram", search for nodes that have compatible = "nvram". This can't be converted into a single call to of_find_compatible_node() with a non-NULL type, because that searches for a node that has _both_ type & compatible = "nvram". Signed-off-by:
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Michael Ellerman authored
An upcoming new ics backend will need to implement different matching semantics to the current ones, which are essentially the RTAS ics backends. So move the current match into the RTAS backend, and allow other ics backends to override. Signed-off-by:
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Benjamin Herrenschmidt authored
SCOM is a side-band configuration bus implemented on some processors. This code provides a way for code to map and operate on devices via SCOM, while the details of how that is implemented is left up to a SCOM "controller" in the platform code. Signed-off-by:
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Michael Ellerman authored
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Michael Ellerman authored
We have platform code that needs to find a node's interrupt parent, so export of_irq_find_parent() so we can use it. Signed-off-by:
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Benjamin Herrenschmidt authored
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Anton Blanchard authored
There are a few places we patch instructions without using patch_instruction and patch_branch, probably because they predated it. Fix it. Signed-off-by:
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Michael Ellerman authored
Currently we allocate the stale_map for a cpu when it comes online, this leaves open a small window where a process can be scheduled on the cpu before the stale_map is allocated. Instead allocate the stale_map at CPU_UP_PREPARE time, that way it will be always available before tasks start running. It is possible the cpu fails to come up, in which case we should free the stale_map, so add a CPU_UP_CANCELED case to do that. Signed-off-by:
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Michael Ellerman authored
When we start a cpu we use smp_ops->kick_cpu(), which currently returns void, it should be able to fail. Convert it to return int, and update all uses. Convert all the current error cases to return -ENOENT, which is what would eventually be returned by __cpu_up() currently when it doesn't detect the cpu as coming up in time. Signed-off-by:
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David Gibson authored
This is a first cut at making bootwrapper code which will produce a zImage compliant with the requirements set down by ePAPR. This is a very simple bootwrapper, taking the device tree blob supplied by the ePAPR boot program and passing it on to the kernel. It builds on the earlier patch to build a relocatable ET_DYN zImage to meet the other ePAPR image requirements. For good measure we have some paranoid checks which will generate warnings if some of the ePAPR entry condition guarantees are not met. Signed-off-by:
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Michael Ellerman authored
This patch adds code, linker script and makefile support to allow building the zImage wrapper around the kernel as a position independent executable. This results in an ET_DYN instead of an ET_EXEC ELF output file, which can be loaded at any location by the firmware and will process its own relocations to work correctly at the loaded address. This is of interest particularly since the standard ePAPR image format must be an ET_DYN (although this patch alone is not sufficient to produce a fully ePAPR compliant boot image). Note for now we don't enable building with -pie for anything. Signed-off-by:
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Michael Ellerman authored
On Book3E, MMU_NO_CONTEXT != 0, but the slice_mm_new_context() macro assumes that it is. This means that the map of the page sizes for each slice is always initialized to zeroes (which happens to be 4k pages), rather than to the correct default base page size value - which might be 64k. This patch corrects the problem. Signed-off-by:
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Michael Ellerman authored
Use MMU_NO_CONTEXT as the initialiser for mm_context.id on nohash and hash64. Signed-off-by:
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