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974b9b2c68
All architectures define pte_index() as (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1) and all architectures define pte_offset_kernel() as an entry in the array of PTEs indexed by the pte_index(). For the most architectures the pte_offset_kernel() implementation relies on the availability of pmd_page_vaddr() that converts a PMD entry value to the virtual address of the page containing PTEs array. Let's move x86 definitions of the PTE accessors to the generic place in <linux/pgtable.h> and then simply drop the respective definitions from the other architectures. The architectures that didn't provide pmd_page_vaddr() are updated to have that defined. The generic implementation of pte_offset_kernel() can be overridden by an architecture and alpha makes use of this because it has special ordering requirements for its version of pte_offset_kernel(). [rppt@linux.ibm.com: v2] Link: http://lkml.kernel.org/r/20200514170327.31389-11-rppt@kernel.org [rppt@linux.ibm.com: update] Link: http://lkml.kernel.org/r/20200514170327.31389-12-rppt@kernel.org [rppt@linux.ibm.com: update] Link: http://lkml.kernel.org/r/20200514170327.31389-13-rppt@kernel.org [akpm@linux-foundation.org: fix x86 warning] [sfr@canb.auug.org.au: fix powerpc build] Link: http://lkml.kernel.org/r/20200607153443.GB738695@linux.ibm.com Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Cain <bcain@codeaurora.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chris Zankel <chris@zankel.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Greg Ungerer <gerg@linux-m68k.org> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Guo Ren <guoren@kernel.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Helge Deller <deller@gmx.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Ley Foon Tan <ley.foon.tan@intel.com> Cc: Mark Salter <msalter@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Nick Hu <nickhu@andestech.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Richard Weinberger <richard@nod.at> Cc: Rich Felker <dalias@libc.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Stafford Horne <shorne@gmail.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vincent Chen <deanbo422@gmail.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Will Deacon <will@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: http://lkml.kernel.org/r/20200514170327.31389-10-rppt@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
464 lines
12 KiB
C
464 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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** PARISC 1.1 Dynamic DMA mapping support.
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** This implementation is for PA-RISC platforms that do not support
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** I/O TLBs (aka DMA address translation hardware).
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** See Documentation/DMA-API-HOWTO.txt for interface definitions.
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**
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** (c) Copyright 1999,2000 Hewlett-Packard Company
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** (c) Copyright 2000 Grant Grundler
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** (c) Copyright 2000 Philipp Rumpf <prumpf@tux.org>
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** (c) Copyright 2000 John Marvin
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**
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** "leveraged" from 2.3.47: arch/ia64/kernel/pci-dma.c.
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** (I assume it's from David Mosberger-Tang but there was no Copyright)
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**
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** AFAIK, all PA7100LC and PA7300LC platforms can use this code.
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**
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** - ggg
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*/
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#include <linux/init.h>
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#include <linux/gfp.h>
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#include <linux/mm.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/dma-direct.h>
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#include <linux/dma-noncoherent.h>
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#include <asm/cacheflush.h>
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#include <asm/dma.h> /* for DMA_CHUNK_SIZE */
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#include <asm/io.h>
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#include <asm/page.h> /* get_order */
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#include <asm/pgalloc.h>
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#include <linux/uaccess.h>
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#include <asm/tlbflush.h> /* for purge_tlb_*() macros */
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static struct proc_dir_entry * proc_gsc_root __read_mostly = NULL;
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static unsigned long pcxl_used_bytes __read_mostly = 0;
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static unsigned long pcxl_used_pages __read_mostly = 0;
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extern unsigned long pcxl_dma_start; /* Start of pcxl dma mapping area */
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static DEFINE_SPINLOCK(pcxl_res_lock);
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static char *pcxl_res_map;
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static int pcxl_res_hint;
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static int pcxl_res_size;
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#ifdef DEBUG_PCXL_RESOURCE
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#define DBG_RES(x...) printk(x)
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#else
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#define DBG_RES(x...)
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#endif
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/*
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** Dump a hex representation of the resource map.
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*/
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#ifdef DUMP_RESMAP
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static
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void dump_resmap(void)
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{
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u_long *res_ptr = (unsigned long *)pcxl_res_map;
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u_long i = 0;
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printk("res_map: ");
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for(; i < (pcxl_res_size / sizeof(unsigned long)); ++i, ++res_ptr)
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printk("%08lx ", *res_ptr);
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printk("\n");
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}
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#else
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static inline void dump_resmap(void) {;}
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#endif
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static inline int map_pte_uncached(pte_t * pte,
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unsigned long vaddr,
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unsigned long size, unsigned long *paddr_ptr)
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{
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unsigned long end;
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unsigned long orig_vaddr = vaddr;
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vaddr &= ~PMD_MASK;
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end = vaddr + size;
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if (end > PMD_SIZE)
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end = PMD_SIZE;
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do {
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unsigned long flags;
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if (!pte_none(*pte))
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printk(KERN_ERR "map_pte_uncached: page already exists\n");
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purge_tlb_start(flags);
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set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC));
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pdtlb_kernel(orig_vaddr);
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purge_tlb_end(flags);
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vaddr += PAGE_SIZE;
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orig_vaddr += PAGE_SIZE;
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(*paddr_ptr) += PAGE_SIZE;
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pte++;
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} while (vaddr < end);
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return 0;
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}
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static inline int map_pmd_uncached(pmd_t * pmd, unsigned long vaddr,
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unsigned long size, unsigned long *paddr_ptr)
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{
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unsigned long end;
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unsigned long orig_vaddr = vaddr;
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vaddr &= ~PGDIR_MASK;
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end = vaddr + size;
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if (end > PGDIR_SIZE)
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end = PGDIR_SIZE;
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do {
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pte_t * pte = pte_alloc_kernel(pmd, vaddr);
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if (!pte)
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return -ENOMEM;
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if (map_pte_uncached(pte, orig_vaddr, end - vaddr, paddr_ptr))
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return -ENOMEM;
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vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
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orig_vaddr += PMD_SIZE;
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pmd++;
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} while (vaddr < end);
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return 0;
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}
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static inline int map_uncached_pages(unsigned long vaddr, unsigned long size,
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unsigned long paddr)
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{
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pgd_t * dir;
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unsigned long end = vaddr + size;
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dir = pgd_offset_k(vaddr);
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do {
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p4d_t *p4d;
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pud_t *pud;
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pmd_t *pmd;
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p4d = p4d_offset(dir, vaddr);
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pud = pud_offset(p4d, vaddr);
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pmd = pmd_alloc(NULL, pud, vaddr);
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if (!pmd)
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return -ENOMEM;
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if (map_pmd_uncached(pmd, vaddr, end - vaddr, &paddr))
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return -ENOMEM;
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vaddr = vaddr + PGDIR_SIZE;
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dir++;
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} while (vaddr && (vaddr < end));
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return 0;
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}
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static inline void unmap_uncached_pte(pmd_t * pmd, unsigned long vaddr,
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unsigned long size)
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{
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pte_t * pte;
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unsigned long end;
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unsigned long orig_vaddr = vaddr;
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if (pmd_none(*pmd))
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return;
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if (pmd_bad(*pmd)) {
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pmd_ERROR(*pmd);
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pmd_clear(pmd);
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return;
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}
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pte = pte_offset_map(pmd, vaddr);
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vaddr &= ~PMD_MASK;
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end = vaddr + size;
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if (end > PMD_SIZE)
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end = PMD_SIZE;
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do {
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unsigned long flags;
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pte_t page = *pte;
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pte_clear(&init_mm, vaddr, pte);
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purge_tlb_start(flags);
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pdtlb_kernel(orig_vaddr);
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purge_tlb_end(flags);
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vaddr += PAGE_SIZE;
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orig_vaddr += PAGE_SIZE;
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pte++;
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if (pte_none(page) || pte_present(page))
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continue;
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printk(KERN_CRIT "Whee.. Swapped out page in kernel page table\n");
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} while (vaddr < end);
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}
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static inline void unmap_uncached_pmd(pgd_t * dir, unsigned long vaddr,
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unsigned long size)
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{
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pmd_t * pmd;
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unsigned long end;
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unsigned long orig_vaddr = vaddr;
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if (pgd_none(*dir))
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return;
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if (pgd_bad(*dir)) {
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pgd_ERROR(*dir);
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pgd_clear(dir);
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return;
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}
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pmd = pmd_offset(pud_offset(p4d_offset(dir, vaddr), vaddr), vaddr);
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vaddr &= ~PGDIR_MASK;
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end = vaddr + size;
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if (end > PGDIR_SIZE)
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end = PGDIR_SIZE;
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do {
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unmap_uncached_pte(pmd, orig_vaddr, end - vaddr);
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vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
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orig_vaddr += PMD_SIZE;
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pmd++;
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} while (vaddr < end);
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}
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static void unmap_uncached_pages(unsigned long vaddr, unsigned long size)
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{
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pgd_t * dir;
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unsigned long end = vaddr + size;
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dir = pgd_offset_k(vaddr);
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do {
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unmap_uncached_pmd(dir, vaddr, end - vaddr);
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vaddr = vaddr + PGDIR_SIZE;
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dir++;
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} while (vaddr && (vaddr < end));
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}
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#define PCXL_SEARCH_LOOP(idx, mask, size) \
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for(; res_ptr < res_end; ++res_ptr) \
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{ \
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if(0 == ((*res_ptr) & mask)) { \
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*res_ptr |= mask; \
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idx = (int)((u_long)res_ptr - (u_long)pcxl_res_map); \
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pcxl_res_hint = idx + (size >> 3); \
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goto resource_found; \
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} \
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}
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#define PCXL_FIND_FREE_MAPPING(idx, mask, size) { \
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u##size *res_ptr = (u##size *)&(pcxl_res_map[pcxl_res_hint & ~((size >> 3) - 1)]); \
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u##size *res_end = (u##size *)&pcxl_res_map[pcxl_res_size]; \
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PCXL_SEARCH_LOOP(idx, mask, size); \
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res_ptr = (u##size *)&pcxl_res_map[0]; \
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PCXL_SEARCH_LOOP(idx, mask, size); \
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}
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unsigned long
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pcxl_alloc_range(size_t size)
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{
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int res_idx;
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u_long mask, flags;
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unsigned int pages_needed = size >> PAGE_SHIFT;
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mask = (u_long) -1L;
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mask >>= BITS_PER_LONG - pages_needed;
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DBG_RES("pcxl_alloc_range() size: %d pages_needed %d pages_mask 0x%08lx\n",
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size, pages_needed, mask);
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spin_lock_irqsave(&pcxl_res_lock, flags);
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if(pages_needed <= 8) {
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PCXL_FIND_FREE_MAPPING(res_idx, mask, 8);
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} else if(pages_needed <= 16) {
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PCXL_FIND_FREE_MAPPING(res_idx, mask, 16);
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} else if(pages_needed <= 32) {
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PCXL_FIND_FREE_MAPPING(res_idx, mask, 32);
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} else {
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panic("%s: pcxl_alloc_range() Too many pages to map.\n",
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__FILE__);
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}
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dump_resmap();
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panic("%s: pcxl_alloc_range() out of dma mapping resources\n",
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__FILE__);
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resource_found:
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DBG_RES("pcxl_alloc_range() res_idx %d mask 0x%08lx res_hint: %d\n",
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res_idx, mask, pcxl_res_hint);
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pcxl_used_pages += pages_needed;
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pcxl_used_bytes += ((pages_needed >> 3) ? (pages_needed >> 3) : 1);
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spin_unlock_irqrestore(&pcxl_res_lock, flags);
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dump_resmap();
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/*
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** return the corresponding vaddr in the pcxl dma map
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*/
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return (pcxl_dma_start + (res_idx << (PAGE_SHIFT + 3)));
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}
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#define PCXL_FREE_MAPPINGS(idx, m, size) \
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u##size *res_ptr = (u##size *)&(pcxl_res_map[(idx) + (((size >> 3) - 1) & (~((size >> 3) - 1)))]); \
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/* BUG_ON((*res_ptr & m) != m); */ \
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*res_ptr &= ~m;
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/*
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** clear bits in the pcxl resource map
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*/
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static void
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pcxl_free_range(unsigned long vaddr, size_t size)
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{
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u_long mask, flags;
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unsigned int res_idx = (vaddr - pcxl_dma_start) >> (PAGE_SHIFT + 3);
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unsigned int pages_mapped = size >> PAGE_SHIFT;
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mask = (u_long) -1L;
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mask >>= BITS_PER_LONG - pages_mapped;
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DBG_RES("pcxl_free_range() res_idx: %d size: %d pages_mapped %d mask 0x%08lx\n",
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res_idx, size, pages_mapped, mask);
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spin_lock_irqsave(&pcxl_res_lock, flags);
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if(pages_mapped <= 8) {
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PCXL_FREE_MAPPINGS(res_idx, mask, 8);
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} else if(pages_mapped <= 16) {
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PCXL_FREE_MAPPINGS(res_idx, mask, 16);
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} else if(pages_mapped <= 32) {
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PCXL_FREE_MAPPINGS(res_idx, mask, 32);
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} else {
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panic("%s: pcxl_free_range() Too many pages to unmap.\n",
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__FILE__);
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}
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pcxl_used_pages -= (pages_mapped ? pages_mapped : 1);
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pcxl_used_bytes -= ((pages_mapped >> 3) ? (pages_mapped >> 3) : 1);
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spin_unlock_irqrestore(&pcxl_res_lock, flags);
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dump_resmap();
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}
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static int proc_pcxl_dma_show(struct seq_file *m, void *v)
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{
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#if 0
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u_long i = 0;
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unsigned long *res_ptr = (u_long *)pcxl_res_map;
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#endif
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unsigned long total_pages = pcxl_res_size << 3; /* 8 bits per byte */
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seq_printf(m, "\nDMA Mapping Area size : %d bytes (%ld pages)\n",
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PCXL_DMA_MAP_SIZE, total_pages);
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seq_printf(m, "Resource bitmap : %d bytes\n", pcxl_res_size);
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seq_puts(m, " total: free: used: % used:\n");
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seq_printf(m, "blocks %8d %8ld %8ld %8ld%%\n", pcxl_res_size,
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pcxl_res_size - pcxl_used_bytes, pcxl_used_bytes,
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(pcxl_used_bytes * 100) / pcxl_res_size);
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seq_printf(m, "pages %8ld %8ld %8ld %8ld%%\n", total_pages,
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total_pages - pcxl_used_pages, pcxl_used_pages,
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(pcxl_used_pages * 100 / total_pages));
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#if 0
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seq_puts(m, "\nResource bitmap:");
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for(; i < (pcxl_res_size / sizeof(u_long)); ++i, ++res_ptr) {
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if ((i & 7) == 0)
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seq_puts(m,"\n ");
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seq_printf(m, "%s %08lx", buf, *res_ptr);
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}
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#endif
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seq_putc(m, '\n');
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return 0;
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}
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static int __init
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pcxl_dma_init(void)
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{
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if (pcxl_dma_start == 0)
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return 0;
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pcxl_res_size = PCXL_DMA_MAP_SIZE >> (PAGE_SHIFT + 3);
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pcxl_res_hint = 0;
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pcxl_res_map = (char *)__get_free_pages(GFP_KERNEL,
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get_order(pcxl_res_size));
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memset(pcxl_res_map, 0, pcxl_res_size);
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proc_gsc_root = proc_mkdir("gsc", NULL);
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if (!proc_gsc_root)
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printk(KERN_WARNING
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"pcxl_dma_init: Unable to create gsc /proc dir entry\n");
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else {
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struct proc_dir_entry* ent;
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ent = proc_create_single("pcxl_dma", 0, proc_gsc_root,
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proc_pcxl_dma_show);
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if (!ent)
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printk(KERN_WARNING
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"pci-dma.c: Unable to create pcxl_dma /proc entry.\n");
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}
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return 0;
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}
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__initcall(pcxl_dma_init);
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void *arch_dma_alloc(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
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{
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unsigned long vaddr;
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unsigned long paddr;
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int order;
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if (boot_cpu_data.cpu_type != pcxl2 && boot_cpu_data.cpu_type != pcxl)
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return NULL;
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order = get_order(size);
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size = 1 << (order + PAGE_SHIFT);
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vaddr = pcxl_alloc_range(size);
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paddr = __get_free_pages(gfp | __GFP_ZERO, order);
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flush_kernel_dcache_range(paddr, size);
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paddr = __pa(paddr);
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map_uncached_pages(vaddr, size, paddr);
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*dma_handle = (dma_addr_t) paddr;
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#if 0
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/* This probably isn't needed to support EISA cards.
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** ISA cards will certainly only support 24-bit DMA addressing.
|
|
** Not clear if we can, want, or need to support ISA.
|
|
*/
|
|
if (!dev || *dev->coherent_dma_mask < 0xffffffff)
|
|
gfp |= GFP_DMA;
|
|
#endif
|
|
return (void *)vaddr;
|
|
}
|
|
|
|
void arch_dma_free(struct device *dev, size_t size, void *vaddr,
|
|
dma_addr_t dma_handle, unsigned long attrs)
|
|
{
|
|
int order = get_order(size);
|
|
|
|
WARN_ON_ONCE(boot_cpu_data.cpu_type != pcxl2 &&
|
|
boot_cpu_data.cpu_type != pcxl);
|
|
|
|
size = 1 << (order + PAGE_SHIFT);
|
|
unmap_uncached_pages((unsigned long)vaddr, size);
|
|
pcxl_free_range((unsigned long)vaddr, size);
|
|
|
|
free_pages((unsigned long)__va(dma_handle), order);
|
|
}
|
|
|
|
void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
|
|
enum dma_data_direction dir)
|
|
{
|
|
flush_kernel_dcache_range((unsigned long)phys_to_virt(paddr), size);
|
|
}
|
|
|
|
void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
|
|
enum dma_data_direction dir)
|
|
{
|
|
flush_kernel_dcache_range((unsigned long)phys_to_virt(paddr), size);
|
|
}
|
|
|
|
void arch_dma_cache_sync(struct device *dev, void *vaddr, size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
flush_kernel_dcache_range((unsigned long)vaddr, size);
|
|
}
|