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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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4a45b7460c
PPC32 and PPC64 are doing the same once SLAB is available. Create a do_ioremap() function that calls get_vm_area and do the mapping. For PPC64, we add the 4K PFN hack sanity check to __ioremap_caller() in order to avoid using __ioremap_at(). Other checks in __ioremap_at() are irrelevant for __ioremap_caller(). On PPC64, VM area is allocated in the range [ioremap_bot ; IOREMAP_END] On PPC32, VM area is allocated in the range [VMALLOC_START ; VMALLOC_END] Lets define IOREMAP_START is ioremap_bot for PPC64, and alias IOREMAP_START/END to VMALLOC_START/END on PPC32 Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/42e7e36ad32e0fdf76692426cc642799c9f689b8.1566309263.git.christophe.leroy@c-s.fr
96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <mm/mmu_decl.h>
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void __iomem *ioremap_wt(phys_addr_t addr, unsigned long size)
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{
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pgprot_t prot = pgprot_cached_wthru(PAGE_KERNEL);
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return __ioremap_caller(addr, size, prot, __builtin_return_address(0));
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}
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EXPORT_SYMBOL(ioremap_wt);
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void __iomem *
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__ioremap_caller(phys_addr_t addr, unsigned long size, pgprot_t prot, void *caller)
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{
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unsigned long v;
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phys_addr_t p, offset;
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int err;
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/*
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* Choose an address to map it to.
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* Once the vmalloc system is running, we use it.
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* Before then, we use space going down from IOREMAP_TOP
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* (ioremap_bot records where we're up to).
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*/
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p = addr & PAGE_MASK;
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offset = addr & ~PAGE_MASK;
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size = PAGE_ALIGN(addr + size) - p;
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/*
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* If the address lies within the first 16 MB, assume it's in ISA
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* memory space
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*/
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if (p < 16 * 1024 * 1024)
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p += _ISA_MEM_BASE;
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#ifndef CONFIG_CRASH_DUMP
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/*
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* Don't allow anybody to remap normal RAM that we're using.
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* mem_init() sets high_memory so only do the check after that.
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*/
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if (slab_is_available() && p <= virt_to_phys(high_memory - 1) &&
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page_is_ram(__phys_to_pfn(p))) {
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pr_warn("%s(): phys addr 0x%llx is RAM lr %ps\n", __func__,
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(unsigned long long)p, __builtin_return_address(0));
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return NULL;
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}
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#endif
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if (size == 0)
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return NULL;
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/*
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* Is it already mapped? Perhaps overlapped by a previous
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* mapping.
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*/
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v = p_block_mapped(p);
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if (v)
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goto out;
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if (slab_is_available()) {
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return do_ioremap(p, offset, size, prot, caller);
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} else {
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v = (ioremap_bot -= size);
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}
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/*
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* Should check if it is a candidate for a BAT mapping
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*/
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err = ioremap_range((unsigned long)v, p, size, prot);
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if (err)
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return NULL;
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out:
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return (void __iomem *)(v + ((unsigned long)addr & ~PAGE_MASK));
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}
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void iounmap(volatile void __iomem *addr)
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{
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/*
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* If mapped by BATs then there is nothing to do.
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* Calling vfree() generates a benign warning.
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*/
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if (v_block_mapped((unsigned long)addr))
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return;
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if (addr > high_memory && (unsigned long)addr < ioremap_bot)
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vunmap((void *)(PAGE_MASK & (unsigned long)addr));
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}
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EXPORT_SYMBOL(iounmap);
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