![Benjamin Herrenschmidt](/assets/img/avatar_default.png)
This adds the necessary bits and pieces to powerpc implementation of ioremap to benefit from caller tracking in /proc/vmallocinfo, at least for ioremap's done after mem init as the older ones aren't tracked. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
712 lines
19 KiB
C
712 lines
19 KiB
C
/*
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* Copyright (c) 2000 Mike Corrigan <mikejc@us.ibm.com>
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* Copyright (c) 1999-2000 Grant Erickson <grant@lcse.umn.edu>
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*
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* Description:
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* Architecture- / platform-specific boot-time initialization code for
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* the IBM iSeries LPAR. Adapted from original code by Grant Erickson and
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* code by Gary Thomas, Cort Dougan <cort@fsmlabs.com>, and Dan Malek
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* <dan@net4x.com>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#undef DEBUG
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#include <linux/init.h>
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#include <linux/threads.h>
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#include <linux/smp.h>
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#include <linux/param.h>
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#include <linux/string.h>
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#include <linux/seq_file.h>
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#include <linux/kdev_t.h>
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#include <linux/kexec.h>
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#include <linux/major.h>
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#include <linux/root_dev.h>
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#include <linux/kernel.h>
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#include <linux/hrtimer.h>
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#include <linux/tick.h>
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#include <asm/processor.h>
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#include <asm/machdep.h>
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#include <asm/page.h>
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#include <asm/mmu.h>
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#include <asm/pgtable.h>
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#include <asm/mmu_context.h>
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#include <asm/cputable.h>
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#include <asm/sections.h>
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#include <asm/iommu.h>
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#include <asm/firmware.h>
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#include <asm/system.h>
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#include <asm/time.h>
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#include <asm/paca.h>
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#include <asm/cache.h>
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#include <asm/abs_addr.h>
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#include <asm/iseries/hv_lp_config.h>
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#include <asm/iseries/hv_call_event.h>
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#include <asm/iseries/hv_call_xm.h>
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#include <asm/iseries/it_lp_queue.h>
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#include <asm/iseries/mf.h>
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#include <asm/iseries/hv_lp_event.h>
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#include <asm/iseries/lpar_map.h>
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#include <asm/udbg.h>
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#include <asm/irq.h>
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#include "naca.h"
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#include "setup.h"
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#include "irq.h"
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#include "vpd_areas.h"
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#include "processor_vpd.h"
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#include "it_lp_naca.h"
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#include "main_store.h"
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#include "call_sm.h"
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#include "call_hpt.h"
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#include "pci.h"
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#ifdef DEBUG
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#define DBG(fmt...) udbg_printf(fmt)
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#else
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#define DBG(fmt...)
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#endif
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/* Function Prototypes */
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static unsigned long build_iSeries_Memory_Map(void);
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static void iseries_shared_idle(void);
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static void iseries_dedicated_idle(void);
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struct MemoryBlock {
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unsigned long absStart;
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unsigned long absEnd;
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unsigned long logicalStart;
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unsigned long logicalEnd;
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};
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/*
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* Process the main store vpd to determine where the holes in memory are
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* and return the number of physical blocks and fill in the array of
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* block data.
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*/
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static unsigned long iSeries_process_Condor_mainstore_vpd(
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struct MemoryBlock *mb_array, unsigned long max_entries)
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{
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unsigned long holeFirstChunk, holeSizeChunks;
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unsigned long numMemoryBlocks = 1;
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struct IoHriMainStoreSegment4 *msVpd =
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(struct IoHriMainStoreSegment4 *)xMsVpd;
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unsigned long holeStart = msVpd->nonInterleavedBlocksStartAdr;
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unsigned long holeEnd = msVpd->nonInterleavedBlocksEndAdr;
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unsigned long holeSize = holeEnd - holeStart;
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printk("Mainstore_VPD: Condor\n");
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/*
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* Determine if absolute memory has any
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* holes so that we can interpret the
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* access map we get back from the hypervisor
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* correctly.
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*/
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mb_array[0].logicalStart = 0;
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mb_array[0].logicalEnd = 0x100000000UL;
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mb_array[0].absStart = 0;
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mb_array[0].absEnd = 0x100000000UL;
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if (holeSize) {
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numMemoryBlocks = 2;
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holeStart = holeStart & 0x000fffffffffffffUL;
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holeStart = addr_to_chunk(holeStart);
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holeFirstChunk = holeStart;
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holeSize = addr_to_chunk(holeSize);
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holeSizeChunks = holeSize;
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printk( "Main store hole: start chunk = %0lx, size = %0lx chunks\n",
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holeFirstChunk, holeSizeChunks );
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mb_array[0].logicalEnd = holeFirstChunk;
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mb_array[0].absEnd = holeFirstChunk;
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mb_array[1].logicalStart = holeFirstChunk;
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mb_array[1].logicalEnd = 0x100000000UL - holeSizeChunks;
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mb_array[1].absStart = holeFirstChunk + holeSizeChunks;
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mb_array[1].absEnd = 0x100000000UL;
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}
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return numMemoryBlocks;
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}
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#define MaxSegmentAreas 32
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#define MaxSegmentAdrRangeBlocks 128
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#define MaxAreaRangeBlocks 4
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static unsigned long iSeries_process_Regatta_mainstore_vpd(
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struct MemoryBlock *mb_array, unsigned long max_entries)
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{
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struct IoHriMainStoreSegment5 *msVpdP =
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(struct IoHriMainStoreSegment5 *)xMsVpd;
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unsigned long numSegmentBlocks = 0;
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u32 existsBits = msVpdP->msAreaExists;
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unsigned long area_num;
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printk("Mainstore_VPD: Regatta\n");
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for (area_num = 0; area_num < MaxSegmentAreas; ++area_num ) {
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unsigned long numAreaBlocks;
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struct IoHriMainStoreArea4 *currentArea;
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if (existsBits & 0x80000000) {
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unsigned long block_num;
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currentArea = &msVpdP->msAreaArray[area_num];
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numAreaBlocks = currentArea->numAdrRangeBlocks;
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printk("ms_vpd: processing area %2ld blocks=%ld",
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area_num, numAreaBlocks);
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for (block_num = 0; block_num < numAreaBlocks;
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++block_num ) {
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/* Process an address range block */
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struct MemoryBlock tempBlock;
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unsigned long i;
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tempBlock.absStart =
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(unsigned long)currentArea->xAdrRangeBlock[block_num].blockStart;
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tempBlock.absEnd =
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(unsigned long)currentArea->xAdrRangeBlock[block_num].blockEnd;
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tempBlock.logicalStart = 0;
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tempBlock.logicalEnd = 0;
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printk("\n block %ld absStart=%016lx absEnd=%016lx",
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block_num, tempBlock.absStart,
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tempBlock.absEnd);
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for (i = 0; i < numSegmentBlocks; ++i) {
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if (mb_array[i].absStart ==
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tempBlock.absStart)
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break;
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}
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if (i == numSegmentBlocks) {
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if (numSegmentBlocks == max_entries)
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panic("iSeries_process_mainstore_vpd: too many memory blocks");
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mb_array[numSegmentBlocks] = tempBlock;
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++numSegmentBlocks;
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} else
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printk(" (duplicate)");
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}
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printk("\n");
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}
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existsBits <<= 1;
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}
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/* Now sort the blocks found into ascending sequence */
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if (numSegmentBlocks > 1) {
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unsigned long m, n;
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for (m = 0; m < numSegmentBlocks - 1; ++m) {
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for (n = numSegmentBlocks - 1; m < n; --n) {
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if (mb_array[n].absStart <
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mb_array[n-1].absStart) {
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struct MemoryBlock tempBlock;
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tempBlock = mb_array[n];
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mb_array[n] = mb_array[n-1];
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mb_array[n-1] = tempBlock;
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}
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}
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}
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}
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/*
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* Assign "logical" addresses to each block. These
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* addresses correspond to the hypervisor "bitmap" space.
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* Convert all addresses into units of 256K chunks.
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*/
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{
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unsigned long i, nextBitmapAddress;
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printk("ms_vpd: %ld sorted memory blocks\n", numSegmentBlocks);
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nextBitmapAddress = 0;
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for (i = 0; i < numSegmentBlocks; ++i) {
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unsigned long length = mb_array[i].absEnd -
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mb_array[i].absStart;
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mb_array[i].logicalStart = nextBitmapAddress;
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mb_array[i].logicalEnd = nextBitmapAddress + length;
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nextBitmapAddress += length;
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printk(" Bitmap range: %016lx - %016lx\n"
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" Absolute range: %016lx - %016lx\n",
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mb_array[i].logicalStart,
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mb_array[i].logicalEnd,
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mb_array[i].absStart, mb_array[i].absEnd);
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mb_array[i].absStart = addr_to_chunk(mb_array[i].absStart &
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0x000fffffffffffffUL);
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mb_array[i].absEnd = addr_to_chunk(mb_array[i].absEnd &
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0x000fffffffffffffUL);
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mb_array[i].logicalStart =
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addr_to_chunk(mb_array[i].logicalStart);
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mb_array[i].logicalEnd = addr_to_chunk(mb_array[i].logicalEnd);
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}
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}
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return numSegmentBlocks;
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}
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static unsigned long iSeries_process_mainstore_vpd(struct MemoryBlock *mb_array,
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unsigned long max_entries)
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{
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unsigned long i;
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unsigned long mem_blocks = 0;
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if (cpu_has_feature(CPU_FTR_SLB))
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mem_blocks = iSeries_process_Regatta_mainstore_vpd(mb_array,
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max_entries);
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else
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mem_blocks = iSeries_process_Condor_mainstore_vpd(mb_array,
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max_entries);
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printk("Mainstore_VPD: numMemoryBlocks = %ld \n", mem_blocks);
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for (i = 0; i < mem_blocks; ++i) {
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printk("Mainstore_VPD: block %3ld logical chunks %016lx - %016lx\n"
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" abs chunks %016lx - %016lx\n",
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i, mb_array[i].logicalStart, mb_array[i].logicalEnd,
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mb_array[i].absStart, mb_array[i].absEnd);
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}
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return mem_blocks;
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}
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static void __init iSeries_get_cmdline(void)
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{
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char *p, *q;
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/* copy the command line parameter from the primary VSP */
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HvCallEvent_dmaToSp(cmd_line, 2 * 64* 1024, 256,
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HvLpDma_Direction_RemoteToLocal);
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p = cmd_line;
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q = cmd_line + 255;
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while(p < q) {
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if (!*p || *p == '\n')
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break;
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++p;
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}
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*p = 0;
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}
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static void __init iSeries_init_early(void)
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{
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DBG(" -> iSeries_init_early()\n");
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/* Snapshot the timebase, for use in later recalibration */
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iSeries_time_init_early();
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/*
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* Initialize the DMA/TCE management
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*/
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iommu_init_early_iSeries();
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/* Initialize machine-dependency vectors */
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#ifdef CONFIG_SMP
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smp_init_iSeries();
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#endif
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/* Associate Lp Event Queue 0 with processor 0 */
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HvCallEvent_setLpEventQueueInterruptProc(0, 0);
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mf_init();
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DBG(" <- iSeries_init_early()\n");
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}
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struct mschunks_map mschunks_map = {
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/* XXX We don't use these, but Piranha might need them. */
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.chunk_size = MSCHUNKS_CHUNK_SIZE,
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.chunk_shift = MSCHUNKS_CHUNK_SHIFT,
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.chunk_mask = MSCHUNKS_OFFSET_MASK,
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};
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EXPORT_SYMBOL(mschunks_map);
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static void mschunks_alloc(unsigned long num_chunks)
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{
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klimit = _ALIGN(klimit, sizeof(u32));
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mschunks_map.mapping = (u32 *)klimit;
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klimit += num_chunks * sizeof(u32);
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mschunks_map.num_chunks = num_chunks;
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}
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/*
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* The iSeries may have very large memories ( > 128 GB ) and a partition
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* may get memory in "chunks" that may be anywhere in the 2**52 real
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* address space. The chunks are 256K in size. To map this to the
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* memory model Linux expects, the AS/400 specific code builds a
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* translation table to translate what Linux thinks are "physical"
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* addresses to the actual real addresses. This allows us to make
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* it appear to Linux that we have contiguous memory starting at
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* physical address zero while in fact this could be far from the truth.
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* To avoid confusion, I'll let the words physical and/or real address
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* apply to the Linux addresses while I'll use "absolute address" to
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* refer to the actual hardware real address.
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*
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* build_iSeries_Memory_Map gets information from the Hypervisor and
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* looks at the Main Store VPD to determine the absolute addresses
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* of the memory that has been assigned to our partition and builds
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* a table used to translate Linux's physical addresses to these
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* absolute addresses. Absolute addresses are needed when
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* communicating with the hypervisor (e.g. to build HPT entries)
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*
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* Returns the physical memory size
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*/
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static unsigned long __init build_iSeries_Memory_Map(void)
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{
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u32 loadAreaFirstChunk, loadAreaLastChunk, loadAreaSize;
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u32 nextPhysChunk;
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u32 hptFirstChunk, hptLastChunk, hptSizeChunks, hptSizePages;
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u32 totalChunks,moreChunks;
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u32 currChunk, thisChunk, absChunk;
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u32 currDword;
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u32 chunkBit;
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u64 map;
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struct MemoryBlock mb[32];
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unsigned long numMemoryBlocks, curBlock;
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/* Chunk size on iSeries is 256K bytes */
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totalChunks = (u32)HvLpConfig_getMsChunks();
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mschunks_alloc(totalChunks);
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/*
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* Get absolute address of our load area
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* and map it to physical address 0
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* This guarantees that the loadarea ends up at physical 0
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* otherwise, it might not be returned by PLIC as the first
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* chunks
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*/
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loadAreaFirstChunk = (u32)addr_to_chunk(itLpNaca.xLoadAreaAddr);
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loadAreaSize = itLpNaca.xLoadAreaChunks;
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/*
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* Only add the pages already mapped here.
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* Otherwise we might add the hpt pages
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* The rest of the pages of the load area
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* aren't in the HPT yet and can still
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* be assigned an arbitrary physical address
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*/
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if ((loadAreaSize * 64) > HvPagesToMap)
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loadAreaSize = HvPagesToMap / 64;
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loadAreaLastChunk = loadAreaFirstChunk + loadAreaSize - 1;
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/*
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* TODO Do we need to do something if the HPT is in the 64MB load area?
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* This would be required if the itLpNaca.xLoadAreaChunks includes
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* the HPT size
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*/
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printk("Mapping load area - physical addr = 0000000000000000\n"
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" absolute addr = %016lx\n",
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chunk_to_addr(loadAreaFirstChunk));
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printk("Load area size %dK\n", loadAreaSize * 256);
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for (nextPhysChunk = 0; nextPhysChunk < loadAreaSize; ++nextPhysChunk)
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mschunks_map.mapping[nextPhysChunk] =
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loadAreaFirstChunk + nextPhysChunk;
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/*
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* Get absolute address of our HPT and remember it so
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* we won't map it to any physical address
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*/
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hptFirstChunk = (u32)addr_to_chunk(HvCallHpt_getHptAddress());
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hptSizePages = (u32)HvCallHpt_getHptPages();
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hptSizeChunks = hptSizePages >>
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(MSCHUNKS_CHUNK_SHIFT - HW_PAGE_SHIFT);
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hptLastChunk = hptFirstChunk + hptSizeChunks - 1;
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printk("HPT absolute addr = %016lx, size = %dK\n",
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chunk_to_addr(hptFirstChunk), hptSizeChunks * 256);
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/*
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* Determine if absolute memory has any
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* holes so that we can interpret the
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* access map we get back from the hypervisor
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* correctly.
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*/
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numMemoryBlocks = iSeries_process_mainstore_vpd(mb, 32);
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/*
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* Process the main store access map from the hypervisor
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* to build up our physical -> absolute translation table
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*/
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curBlock = 0;
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currChunk = 0;
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currDword = 0;
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moreChunks = totalChunks;
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while (moreChunks) {
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map = HvCallSm_get64BitsOfAccessMap(itLpNaca.xLpIndex,
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currDword);
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thisChunk = currChunk;
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while (map) {
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chunkBit = map >> 63;
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map <<= 1;
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if (chunkBit) {
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--moreChunks;
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while (thisChunk >= mb[curBlock].logicalEnd) {
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++curBlock;
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if (curBlock >= numMemoryBlocks)
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panic("out of memory blocks");
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}
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if (thisChunk < mb[curBlock].logicalStart)
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panic("memory block error");
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absChunk = mb[curBlock].absStart +
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(thisChunk - mb[curBlock].logicalStart);
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if (((absChunk < hptFirstChunk) ||
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(absChunk > hptLastChunk)) &&
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((absChunk < loadAreaFirstChunk) ||
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(absChunk > loadAreaLastChunk))) {
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mschunks_map.mapping[nextPhysChunk] =
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absChunk;
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++nextPhysChunk;
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}
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}
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++thisChunk;
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}
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++currDword;
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currChunk += 64;
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}
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/*
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* main store size (in chunks) is
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* totalChunks - hptSizeChunks
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* which should be equal to
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* nextPhysChunk
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*/
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return chunk_to_addr(nextPhysChunk);
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}
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/*
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* Document me.
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*/
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static void __init iSeries_setup_arch(void)
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{
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if (get_lppaca()->shared_proc) {
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ppc_md.idle_loop = iseries_shared_idle;
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printk(KERN_DEBUG "Using shared processor idle loop\n");
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} else {
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ppc_md.idle_loop = iseries_dedicated_idle;
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printk(KERN_DEBUG "Using dedicated idle loop\n");
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}
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/* Setup the Lp Event Queue */
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setup_hvlpevent_queue();
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printk("Max logical processors = %d\n",
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itVpdAreas.xSlicMaxLogicalProcs);
|
|
printk("Max physical processors = %d\n",
|
|
itVpdAreas.xSlicMaxPhysicalProcs);
|
|
|
|
iSeries_pcibios_init();
|
|
}
|
|
|
|
static void iSeries_show_cpuinfo(struct seq_file *m)
|
|
{
|
|
seq_printf(m, "machine\t\t: 64-bit iSeries Logical Partition\n");
|
|
}
|
|
|
|
static void __init iSeries_progress(char * st, unsigned short code)
|
|
{
|
|
printk("Progress: [%04x] - %s\n", (unsigned)code, st);
|
|
mf_display_progress(code);
|
|
}
|
|
|
|
static void __init iSeries_fixup_klimit(void)
|
|
{
|
|
/*
|
|
* Change klimit to take into account any ram disk
|
|
* that may be included
|
|
*/
|
|
if (naca.xRamDisk)
|
|
klimit = KERNELBASE + (u64)naca.xRamDisk +
|
|
(naca.xRamDiskSize * HW_PAGE_SIZE);
|
|
}
|
|
|
|
static int __init iSeries_src_init(void)
|
|
{
|
|
/* clear the progress line */
|
|
if (firmware_has_feature(FW_FEATURE_ISERIES))
|
|
ppc_md.progress(" ", 0xffff);
|
|
return 0;
|
|
}
|
|
|
|
late_initcall(iSeries_src_init);
|
|
|
|
static inline void process_iSeries_events(void)
|
|
{
|
|
asm volatile ("li 0,0x5555; sc" : : : "r0", "r3");
|
|
}
|
|
|
|
static void yield_shared_processor(void)
|
|
{
|
|
unsigned long tb;
|
|
|
|
HvCall_setEnabledInterrupts(HvCall_MaskIPI |
|
|
HvCall_MaskLpEvent |
|
|
HvCall_MaskLpProd |
|
|
HvCall_MaskTimeout);
|
|
|
|
tb = get_tb();
|
|
/* Compute future tb value when yield should expire */
|
|
HvCall_yieldProcessor(HvCall_YieldTimed, tb+tb_ticks_per_jiffy);
|
|
|
|
/*
|
|
* The decrementer stops during the yield. Force a fake decrementer
|
|
* here and let the timer_interrupt code sort out the actual time.
|
|
*/
|
|
get_lppaca()->int_dword.fields.decr_int = 1;
|
|
ppc64_runlatch_on();
|
|
process_iSeries_events();
|
|
}
|
|
|
|
static void iseries_shared_idle(void)
|
|
{
|
|
while (1) {
|
|
tick_nohz_stop_sched_tick(1);
|
|
while (!need_resched() && !hvlpevent_is_pending()) {
|
|
local_irq_disable();
|
|
ppc64_runlatch_off();
|
|
|
|
/* Recheck with irqs off */
|
|
if (!need_resched() && !hvlpevent_is_pending())
|
|
yield_shared_processor();
|
|
|
|
HMT_medium();
|
|
local_irq_enable();
|
|
}
|
|
|
|
ppc64_runlatch_on();
|
|
tick_nohz_restart_sched_tick();
|
|
|
|
if (hvlpevent_is_pending())
|
|
process_iSeries_events();
|
|
|
|
preempt_enable_no_resched();
|
|
schedule();
|
|
preempt_disable();
|
|
}
|
|
}
|
|
|
|
static void iseries_dedicated_idle(void)
|
|
{
|
|
set_thread_flag(TIF_POLLING_NRFLAG);
|
|
|
|
while (1) {
|
|
tick_nohz_stop_sched_tick(1);
|
|
if (!need_resched()) {
|
|
while (!need_resched()) {
|
|
ppc64_runlatch_off();
|
|
HMT_low();
|
|
|
|
if (hvlpevent_is_pending()) {
|
|
HMT_medium();
|
|
ppc64_runlatch_on();
|
|
process_iSeries_events();
|
|
}
|
|
}
|
|
|
|
HMT_medium();
|
|
}
|
|
|
|
ppc64_runlatch_on();
|
|
tick_nohz_restart_sched_tick();
|
|
preempt_enable_no_resched();
|
|
schedule();
|
|
preempt_disable();
|
|
}
|
|
}
|
|
|
|
static void __iomem *iseries_ioremap(phys_addr_t address, unsigned long size,
|
|
unsigned long flags, void *caller)
|
|
{
|
|
return (void __iomem *)address;
|
|
}
|
|
|
|
static void iseries_iounmap(volatile void __iomem *token)
|
|
{
|
|
}
|
|
|
|
static int __init iseries_probe(void)
|
|
{
|
|
unsigned long root = of_get_flat_dt_root();
|
|
if (!of_flat_dt_is_compatible(root, "IBM,iSeries"))
|
|
return 0;
|
|
|
|
hpte_init_iSeries();
|
|
/* iSeries does not support 16M pages */
|
|
cur_cpu_spec->cpu_features &= ~CPU_FTR_16M_PAGE;
|
|
|
|
return 1;
|
|
}
|
|
|
|
#ifdef CONFIG_KEXEC
|
|
static int iseries_kexec_prepare(struct kimage *image)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
#endif
|
|
|
|
define_machine(iseries) {
|
|
.name = "iSeries",
|
|
.setup_arch = iSeries_setup_arch,
|
|
.show_cpuinfo = iSeries_show_cpuinfo,
|
|
.init_IRQ = iSeries_init_IRQ,
|
|
.get_irq = iSeries_get_irq,
|
|
.init_early = iSeries_init_early,
|
|
.pcibios_fixup = iSeries_pci_final_fixup,
|
|
.pcibios_fixup_resources= iSeries_pcibios_fixup_resources,
|
|
.restart = mf_reboot,
|
|
.power_off = mf_power_off,
|
|
.halt = mf_power_off,
|
|
.get_boot_time = iSeries_get_boot_time,
|
|
.set_rtc_time = iSeries_set_rtc_time,
|
|
.get_rtc_time = iSeries_get_rtc_time,
|
|
.calibrate_decr = generic_calibrate_decr,
|
|
.progress = iSeries_progress,
|
|
.probe = iseries_probe,
|
|
.ioremap = iseries_ioremap,
|
|
.iounmap = iseries_iounmap,
|
|
#ifdef CONFIG_KEXEC
|
|
.machine_kexec_prepare = iseries_kexec_prepare,
|
|
#endif
|
|
/* XXX Implement enable_pmcs for iSeries */
|
|
};
|
|
|
|
void * __init iSeries_early_setup(void)
|
|
{
|
|
unsigned long phys_mem_size;
|
|
|
|
/* Identify CPU type. This is done again by the common code later
|
|
* on but calling this function multiple times is fine.
|
|
*/
|
|
identify_cpu(0, mfspr(SPRN_PVR));
|
|
|
|
powerpc_firmware_features |= FW_FEATURE_ISERIES;
|
|
powerpc_firmware_features |= FW_FEATURE_LPAR;
|
|
|
|
iSeries_fixup_klimit();
|
|
|
|
/*
|
|
* Initialize the table which translate Linux physical addresses to
|
|
* AS/400 absolute addresses
|
|
*/
|
|
phys_mem_size = build_iSeries_Memory_Map();
|
|
|
|
iSeries_get_cmdline();
|
|
|
|
return (void *) __pa(build_flat_dt(phys_mem_size));
|
|
}
|
|
|
|
static void hvputc(char c)
|
|
{
|
|
if (c == '\n')
|
|
hvputc('\r');
|
|
|
|
HvCall_writeLogBuffer(&c, 1);
|
|
}
|
|
|
|
void __init udbg_init_iseries(void)
|
|
{
|
|
udbg_putc = hvputc;
|
|
}
|