linux/arch/parisc/kernel/pci-dma.c
Mike Rapoport 974b9b2c68 mm: consolidate pte_index() and pte_offset_*() definitions
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>
2020-06-09 09:39:14 -07:00

464 lines
12 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
** PARISC 1.1 Dynamic DMA mapping support.
** This implementation is for PA-RISC platforms that do not support
** I/O TLBs (aka DMA address translation hardware).
** See Documentation/DMA-API-HOWTO.txt for interface definitions.
**
** (c) Copyright 1999,2000 Hewlett-Packard Company
** (c) Copyright 2000 Grant Grundler
** (c) Copyright 2000 Philipp Rumpf <prumpf@tux.org>
** (c) Copyright 2000 John Marvin
**
** "leveraged" from 2.3.47: arch/ia64/kernel/pci-dma.c.
** (I assume it's from David Mosberger-Tang but there was no Copyright)
**
** AFAIK, all PA7100LC and PA7300LC platforms can use this code.
**
** - ggg
*/
#include <linux/init.h>
#include <linux/gfp.h>
#include <linux/mm.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/dma-direct.h>
#include <linux/dma-noncoherent.h>
#include <asm/cacheflush.h>
#include <asm/dma.h> /* for DMA_CHUNK_SIZE */
#include <asm/io.h>
#include <asm/page.h> /* get_order */
#include <asm/pgalloc.h>
#include <linux/uaccess.h>
#include <asm/tlbflush.h> /* for purge_tlb_*() macros */
static struct proc_dir_entry * proc_gsc_root __read_mostly = NULL;
static unsigned long pcxl_used_bytes __read_mostly = 0;
static unsigned long pcxl_used_pages __read_mostly = 0;
extern unsigned long pcxl_dma_start; /* Start of pcxl dma mapping area */
static DEFINE_SPINLOCK(pcxl_res_lock);
static char *pcxl_res_map;
static int pcxl_res_hint;
static int pcxl_res_size;
#ifdef DEBUG_PCXL_RESOURCE
#define DBG_RES(x...) printk(x)
#else
#define DBG_RES(x...)
#endif
/*
** Dump a hex representation of the resource map.
*/
#ifdef DUMP_RESMAP
static
void dump_resmap(void)
{
u_long *res_ptr = (unsigned long *)pcxl_res_map;
u_long i = 0;
printk("res_map: ");
for(; i < (pcxl_res_size / sizeof(unsigned long)); ++i, ++res_ptr)
printk("%08lx ", *res_ptr);
printk("\n");
}
#else
static inline void dump_resmap(void) {;}
#endif
static inline int map_pte_uncached(pte_t * pte,
unsigned long vaddr,
unsigned long size, unsigned long *paddr_ptr)
{
unsigned long end;
unsigned long orig_vaddr = vaddr;
vaddr &= ~PMD_MASK;
end = vaddr + size;
if (end > PMD_SIZE)
end = PMD_SIZE;
do {
unsigned long flags;
if (!pte_none(*pte))
printk(KERN_ERR "map_pte_uncached: page already exists\n");
purge_tlb_start(flags);
set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC));
pdtlb_kernel(orig_vaddr);
purge_tlb_end(flags);
vaddr += PAGE_SIZE;
orig_vaddr += PAGE_SIZE;
(*paddr_ptr) += PAGE_SIZE;
pte++;
} while (vaddr < end);
return 0;
}
static inline int map_pmd_uncached(pmd_t * pmd, unsigned long vaddr,
unsigned long size, unsigned long *paddr_ptr)
{
unsigned long end;
unsigned long orig_vaddr = vaddr;
vaddr &= ~PGDIR_MASK;
end = vaddr + size;
if (end > PGDIR_SIZE)
end = PGDIR_SIZE;
do {
pte_t * pte = pte_alloc_kernel(pmd, vaddr);
if (!pte)
return -ENOMEM;
if (map_pte_uncached(pte, orig_vaddr, end - vaddr, paddr_ptr))
return -ENOMEM;
vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
orig_vaddr += PMD_SIZE;
pmd++;
} while (vaddr < end);
return 0;
}
static inline int map_uncached_pages(unsigned long vaddr, unsigned long size,
unsigned long paddr)
{
pgd_t * dir;
unsigned long end = vaddr + size;
dir = pgd_offset_k(vaddr);
do {
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
p4d = p4d_offset(dir, vaddr);
pud = pud_offset(p4d, vaddr);
pmd = pmd_alloc(NULL, pud, vaddr);
if (!pmd)
return -ENOMEM;
if (map_pmd_uncached(pmd, vaddr, end - vaddr, &paddr))
return -ENOMEM;
vaddr = vaddr + PGDIR_SIZE;
dir++;
} while (vaddr && (vaddr < end));
return 0;
}
static inline void unmap_uncached_pte(pmd_t * pmd, unsigned long vaddr,
unsigned long size)
{
pte_t * pte;
unsigned long end;
unsigned long orig_vaddr = vaddr;
if (pmd_none(*pmd))
return;
if (pmd_bad(*pmd)) {
pmd_ERROR(*pmd);
pmd_clear(pmd);
return;
}
pte = pte_offset_map(pmd, vaddr);
vaddr &= ~PMD_MASK;
end = vaddr + size;
if (end > PMD_SIZE)
end = PMD_SIZE;
do {
unsigned long flags;
pte_t page = *pte;
pte_clear(&init_mm, vaddr, pte);
purge_tlb_start(flags);
pdtlb_kernel(orig_vaddr);
purge_tlb_end(flags);
vaddr += PAGE_SIZE;
orig_vaddr += PAGE_SIZE;
pte++;
if (pte_none(page) || pte_present(page))
continue;
printk(KERN_CRIT "Whee.. Swapped out page in kernel page table\n");
} while (vaddr < end);
}
static inline void unmap_uncached_pmd(pgd_t * dir, unsigned long vaddr,
unsigned long size)
{
pmd_t * pmd;
unsigned long end;
unsigned long orig_vaddr = vaddr;
if (pgd_none(*dir))
return;
if (pgd_bad(*dir)) {
pgd_ERROR(*dir);
pgd_clear(dir);
return;
}
pmd = pmd_offset(pud_offset(p4d_offset(dir, vaddr), vaddr), vaddr);
vaddr &= ~PGDIR_MASK;
end = vaddr + size;
if (end > PGDIR_SIZE)
end = PGDIR_SIZE;
do {
unmap_uncached_pte(pmd, orig_vaddr, end - vaddr);
vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
orig_vaddr += PMD_SIZE;
pmd++;
} while (vaddr < end);
}
static void unmap_uncached_pages(unsigned long vaddr, unsigned long size)
{
pgd_t * dir;
unsigned long end = vaddr + size;
dir = pgd_offset_k(vaddr);
do {
unmap_uncached_pmd(dir, vaddr, end - vaddr);
vaddr = vaddr + PGDIR_SIZE;
dir++;
} while (vaddr && (vaddr < end));
}
#define PCXL_SEARCH_LOOP(idx, mask, size) \
for(; res_ptr < res_end; ++res_ptr) \
{ \
if(0 == ((*res_ptr) & mask)) { \
*res_ptr |= mask; \
idx = (int)((u_long)res_ptr - (u_long)pcxl_res_map); \
pcxl_res_hint = idx + (size >> 3); \
goto resource_found; \
} \
}
#define PCXL_FIND_FREE_MAPPING(idx, mask, size) { \
u##size *res_ptr = (u##size *)&(pcxl_res_map[pcxl_res_hint & ~((size >> 3) - 1)]); \
u##size *res_end = (u##size *)&pcxl_res_map[pcxl_res_size]; \
PCXL_SEARCH_LOOP(idx, mask, size); \
res_ptr = (u##size *)&pcxl_res_map[0]; \
PCXL_SEARCH_LOOP(idx, mask, size); \
}
unsigned long
pcxl_alloc_range(size_t size)
{
int res_idx;
u_long mask, flags;
unsigned int pages_needed = size >> PAGE_SHIFT;
mask = (u_long) -1L;
mask >>= BITS_PER_LONG - pages_needed;
DBG_RES("pcxl_alloc_range() size: %d pages_needed %d pages_mask 0x%08lx\n",
size, pages_needed, mask);
spin_lock_irqsave(&pcxl_res_lock, flags);
if(pages_needed <= 8) {
PCXL_FIND_FREE_MAPPING(res_idx, mask, 8);
} else if(pages_needed <= 16) {
PCXL_FIND_FREE_MAPPING(res_idx, mask, 16);
} else if(pages_needed <= 32) {
PCXL_FIND_FREE_MAPPING(res_idx, mask, 32);
} else {
panic("%s: pcxl_alloc_range() Too many pages to map.\n",
__FILE__);
}
dump_resmap();
panic("%s: pcxl_alloc_range() out of dma mapping resources\n",
__FILE__);
resource_found:
DBG_RES("pcxl_alloc_range() res_idx %d mask 0x%08lx res_hint: %d\n",
res_idx, mask, pcxl_res_hint);
pcxl_used_pages += pages_needed;
pcxl_used_bytes += ((pages_needed >> 3) ? (pages_needed >> 3) : 1);
spin_unlock_irqrestore(&pcxl_res_lock, flags);
dump_resmap();
/*
** return the corresponding vaddr in the pcxl dma map
*/
return (pcxl_dma_start + (res_idx << (PAGE_SHIFT + 3)));
}
#define PCXL_FREE_MAPPINGS(idx, m, size) \
u##size *res_ptr = (u##size *)&(pcxl_res_map[(idx) + (((size >> 3) - 1) & (~((size >> 3) - 1)))]); \
/* BUG_ON((*res_ptr & m) != m); */ \
*res_ptr &= ~m;
/*
** clear bits in the pcxl resource map
*/
static void
pcxl_free_range(unsigned long vaddr, size_t size)
{
u_long mask, flags;
unsigned int res_idx = (vaddr - pcxl_dma_start) >> (PAGE_SHIFT + 3);
unsigned int pages_mapped = size >> PAGE_SHIFT;
mask = (u_long) -1L;
mask >>= BITS_PER_LONG - pages_mapped;
DBG_RES("pcxl_free_range() res_idx: %d size: %d pages_mapped %d mask 0x%08lx\n",
res_idx, size, pages_mapped, mask);
spin_lock_irqsave(&pcxl_res_lock, flags);
if(pages_mapped <= 8) {
PCXL_FREE_MAPPINGS(res_idx, mask, 8);
} else if(pages_mapped <= 16) {
PCXL_FREE_MAPPINGS(res_idx, mask, 16);
} else if(pages_mapped <= 32) {
PCXL_FREE_MAPPINGS(res_idx, mask, 32);
} else {
panic("%s: pcxl_free_range() Too many pages to unmap.\n",
__FILE__);
}
pcxl_used_pages -= (pages_mapped ? pages_mapped : 1);
pcxl_used_bytes -= ((pages_mapped >> 3) ? (pages_mapped >> 3) : 1);
spin_unlock_irqrestore(&pcxl_res_lock, flags);
dump_resmap();
}
static int proc_pcxl_dma_show(struct seq_file *m, void *v)
{
#if 0
u_long i = 0;
unsigned long *res_ptr = (u_long *)pcxl_res_map;
#endif
unsigned long total_pages = pcxl_res_size << 3; /* 8 bits per byte */
seq_printf(m, "\nDMA Mapping Area size : %d bytes (%ld pages)\n",
PCXL_DMA_MAP_SIZE, total_pages);
seq_printf(m, "Resource bitmap : %d bytes\n", pcxl_res_size);
seq_puts(m, " total: free: used: % used:\n");
seq_printf(m, "blocks %8d %8ld %8ld %8ld%%\n", pcxl_res_size,
pcxl_res_size - pcxl_used_bytes, pcxl_used_bytes,
(pcxl_used_bytes * 100) / pcxl_res_size);
seq_printf(m, "pages %8ld %8ld %8ld %8ld%%\n", total_pages,
total_pages - pcxl_used_pages, pcxl_used_pages,
(pcxl_used_pages * 100 / total_pages));
#if 0
seq_puts(m, "\nResource bitmap:");
for(; i < (pcxl_res_size / sizeof(u_long)); ++i, ++res_ptr) {
if ((i & 7) == 0)
seq_puts(m,"\n ");
seq_printf(m, "%s %08lx", buf, *res_ptr);
}
#endif
seq_putc(m, '\n');
return 0;
}
static int __init
pcxl_dma_init(void)
{
if (pcxl_dma_start == 0)
return 0;
pcxl_res_size = PCXL_DMA_MAP_SIZE >> (PAGE_SHIFT + 3);
pcxl_res_hint = 0;
pcxl_res_map = (char *)__get_free_pages(GFP_KERNEL,
get_order(pcxl_res_size));
memset(pcxl_res_map, 0, pcxl_res_size);
proc_gsc_root = proc_mkdir("gsc", NULL);
if (!proc_gsc_root)
printk(KERN_WARNING
"pcxl_dma_init: Unable to create gsc /proc dir entry\n");
else {
struct proc_dir_entry* ent;
ent = proc_create_single("pcxl_dma", 0, proc_gsc_root,
proc_pcxl_dma_show);
if (!ent)
printk(KERN_WARNING
"pci-dma.c: Unable to create pcxl_dma /proc entry.\n");
}
return 0;
}
__initcall(pcxl_dma_init);
void *arch_dma_alloc(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
{
unsigned long vaddr;
unsigned long paddr;
int order;
if (boot_cpu_data.cpu_type != pcxl2 && boot_cpu_data.cpu_type != pcxl)
return NULL;
order = get_order(size);
size = 1 << (order + PAGE_SHIFT);
vaddr = pcxl_alloc_range(size);
paddr = __get_free_pages(gfp | __GFP_ZERO, order);
flush_kernel_dcache_range(paddr, size);
paddr = __pa(paddr);
map_uncached_pages(vaddr, size, paddr);
*dma_handle = (dma_addr_t) paddr;
#if 0
/* This probably isn't needed to support EISA cards.
** 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);
}