Contributors: 25
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Linus Torvalds (pre-git) |
1025 |
61.01% |
17 |
26.56% |
| Christoph Hellwig |
305 |
18.15% |
6 |
9.38% |
| David S. Miller |
113 |
6.73% |
6 |
9.38% |
| Kristoffer Glembo |
60 |
3.57% |
4 |
6.25% |
| Alexey Dobriyan |
38 |
2.26% |
2 |
3.12% |
| Sam Ravnborg |
29 |
1.73% |
4 |
6.25% |
| Greg Kroah-Hartman |
18 |
1.07% |
3 |
4.69% |
| Pete Zaitcev |
15 |
0.89% |
2 |
3.12% |
| Al Viro |
11 |
0.65% |
2 |
3.12% |
| FUJITA Tomonori |
11 |
0.65% |
1 |
1.56% |
| Adrian Bunk |
9 |
0.54% |
2 |
3.12% |
| Joe Perches |
7 |
0.42% |
1 |
1.56% |
| Greentime Hu |
6 |
0.36% |
1 |
1.56% |
| Stephen Rothwell |
5 |
0.30% |
1 |
1.56% |
| Krzysztof Kozlowski |
4 |
0.24% |
1 |
1.56% |
| Andrzej Pietrasiewicz |
4 |
0.24% |
1 |
1.56% |
| Jens Axboe |
3 |
0.18% |
1 |
1.56% |
| Benjamin Collins |
3 |
0.18% |
1 |
1.56% |
| Konrad Eisele |
3 |
0.18% |
1 |
1.56% |
| Eric Sesterhenn / Snakebyte |
3 |
0.18% |
1 |
1.56% |
| Adam Buchbinder |
2 |
0.12% |
1 |
1.56% |
| Geert Uytterhoeven |
2 |
0.12% |
1 |
1.56% |
| Linus Torvalds |
2 |
0.12% |
2 |
3.12% |
| Keith M. Wesolowski |
1 |
0.06% |
1 |
1.56% |
| Daniel Hellstrom |
1 |
0.06% |
1 |
1.56% |
| Total |
1680 |
|
64 |
|
// SPDX-License-Identifier: GPL-2.0
/*
* ioport.c: Simple io mapping allocator.
*
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
*
* 1996: sparc_free_io, 1999: ioremap()/iounmap() by Pete Zaitcev.
*
* 2000/01/29
* <rth> zait: as long as pci_alloc_consistent produces something addressable,
* things are ok.
* <zaitcev> rth: no, it is relevant, because get_free_pages returns you a
* pointer into the big page mapping
* <rth> zait: so what?
* <rth> zait: remap_it_my_way(virt_to_phys(get_free_page()))
* <zaitcev> Hmm
* <zaitcev> Suppose I did this remap_it_my_way(virt_to_phys(get_free_page())).
* So far so good.
* <zaitcev> Now, driver calls pci_free_consistent(with result of
* remap_it_my_way()).
* <zaitcev> How do you find the address to pass to free_pages()?
* <rth> zait: walk the page tables? It's only two or three level after all.
* <rth> zait: you have to walk them anyway to remove the mapping.
* <zaitcev> Hmm
* <zaitcev> Sounds reasonable
*/
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/pci.h> /* struct pci_dev */
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/scatterlist.h>
#include <linux/dma-map-ops.h>
#include <linux/of_device.h>
#include <asm/io.h>
#include <asm/vaddrs.h>
#include <asm/oplib.h>
#include <asm/prom.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/dma.h>
#include <asm/iommu.h>
#include <asm/io-unit.h>
#include <asm/leon.h>
/* This function must make sure that caches and memory are coherent after DMA
* On LEON systems without cache snooping it flushes the entire D-CACHE.
*/
static inline void dma_make_coherent(unsigned long pa, unsigned long len)
{
if (sparc_cpu_model == sparc_leon) {
if (!sparc_leon3_snooping_enabled())
leon_flush_dcache_all();
}
}
static void __iomem *_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz);
static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys,
unsigned long size, char *name);
static void _sparc_free_io(struct resource *res);
static void register_proc_sparc_ioport(void);
/* This points to the next to use virtual memory for DVMA mappings */
static struct resource _sparc_dvma = {
.name = "sparc_dvma", .start = DVMA_VADDR, .end = DVMA_END - 1
};
/* This points to the start of I/O mappings, cluable from outside. */
/*ext*/ struct resource sparc_iomap = {
.name = "sparc_iomap", .start = IOBASE_VADDR, .end = IOBASE_END - 1
};
/*
* Our mini-allocator...
* Boy this is gross! We need it because we must map I/O for
* timers and interrupt controller before the kmalloc is available.
*/
#define XNMLN 15
#define XNRES 10 /* SS-10 uses 8 */
struct xresource {
struct resource xres; /* Must be first */
int xflag; /* 1 == used */
char xname[XNMLN+1];
};
static struct xresource xresv[XNRES];
static struct xresource *xres_alloc(void) {
struct xresource *xrp;
int n;
xrp = xresv;
for (n = 0; n < XNRES; n++) {
if (xrp->xflag == 0) {
xrp->xflag = 1;
return xrp;
}
xrp++;
}
return NULL;
}
static void xres_free(struct xresource *xrp) {
xrp->xflag = 0;
}
/*
* These are typically used in PCI drivers
* which are trying to be cross-platform.
*
* Bus type is always zero on IIep.
*/
void __iomem *ioremap(phys_addr_t offset, size_t size)
{
char name[14];
sprintf(name, "phys_%08x", (u32)offset);
return _sparc_alloc_io(0, (unsigned long)offset, size, name);
}
EXPORT_SYMBOL(ioremap);
/*
* Complementary to ioremap().
*/
void iounmap(volatile void __iomem *virtual)
{
unsigned long vaddr = (unsigned long) virtual & PAGE_MASK;
struct resource *res;
/*
* XXX Too slow. Can have 8192 DVMA pages on sun4m in the worst case.
* This probably warrants some sort of hashing.
*/
if ((res = lookup_resource(&sparc_iomap, vaddr)) == NULL) {
printk("free_io/iounmap: cannot free %lx\n", vaddr);
return;
}
_sparc_free_io(res);
if ((char *)res >= (char*)xresv && (char *)res < (char *)&xresv[XNRES]) {
xres_free((struct xresource *)res);
} else {
kfree(res);
}
}
EXPORT_SYMBOL(iounmap);
void __iomem *of_ioremap(struct resource *res, unsigned long offset,
unsigned long size, char *name)
{
return _sparc_alloc_io(res->flags & 0xF,
res->start + offset,
size, name);
}
EXPORT_SYMBOL(of_ioremap);
void of_iounmap(struct resource *res, void __iomem *base, unsigned long size)
{
iounmap(base);
}
EXPORT_SYMBOL(of_iounmap);
/*
* Meat of mapping
*/
static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys,
unsigned long size, char *name)
{
static int printed_full;
struct xresource *xres;
struct resource *res;
char *tack;
int tlen;
void __iomem *va; /* P3 diag */
if (name == NULL) name = "???";
if ((xres = xres_alloc()) != NULL) {
tack = xres->xname;
res = &xres->xres;
} else {
if (!printed_full) {
printk("ioremap: done with statics, switching to malloc\n");
printed_full = 1;
}
tlen = strlen(name);
tack = kmalloc(sizeof (struct resource) + tlen + 1, GFP_KERNEL);
if (tack == NULL) return NULL;
memset(tack, 0, sizeof(struct resource));
res = (struct resource *) tack;
tack += sizeof (struct resource);
}
strlcpy(tack, name, XNMLN+1);
res->name = tack;
va = _sparc_ioremap(res, busno, phys, size);
/* printk("ioremap(0x%x:%08lx[0x%lx])=%p\n", busno, phys, size, va); */ /* P3 diag */
return va;
}
/*
*/
static void __iomem *
_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz)
{
unsigned long offset = ((unsigned long) pa) & (~PAGE_MASK);
if (allocate_resource(&sparc_iomap, res,
(offset + sz + PAGE_SIZE-1) & PAGE_MASK,
sparc_iomap.start, sparc_iomap.end, PAGE_SIZE, NULL, NULL) != 0) {
/* Usually we cannot see printks in this case. */
prom_printf("alloc_io_res(%s): cannot occupy\n",
(res->name != NULL)? res->name: "???");
prom_halt();
}
pa &= PAGE_MASK;
srmmu_mapiorange(bus, pa, res->start, resource_size(res));
return (void __iomem *)(unsigned long)(res->start + offset);
}
/*
* Complementary to _sparc_ioremap().
*/
static void _sparc_free_io(struct resource *res)
{
unsigned long plen;
plen = resource_size(res);
BUG_ON((plen & (PAGE_SIZE-1)) != 0);
srmmu_unmapiorange(res->start, plen);
release_resource(res);
}
unsigned long sparc_dma_alloc_resource(struct device *dev, size_t len)
{
struct resource *res;
res = kzalloc(sizeof(*res), GFP_KERNEL);
if (!res)
return 0;
res->name = dev->of_node->full_name;
if (allocate_resource(&_sparc_dvma, res, len, _sparc_dvma.start,
_sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) {
printk("%s: cannot occupy 0x%zx", __func__, len);
kfree(res);
return 0;
}
return res->start;
}
bool sparc_dma_free_resource(void *cpu_addr, size_t size)
{
unsigned long addr = (unsigned long)cpu_addr;
struct resource *res;
res = lookup_resource(&_sparc_dvma, addr);
if (!res) {
printk("%s: cannot free %p\n", __func__, cpu_addr);
return false;
}
if ((addr & (PAGE_SIZE - 1)) != 0) {
printk("%s: unaligned va %p\n", __func__, cpu_addr);
return false;
}
size = PAGE_ALIGN(size);
if (resource_size(res) != size) {
printk("%s: region 0x%lx asked 0x%zx\n",
__func__, (long)resource_size(res), size);
return false;
}
release_resource(res);
kfree(res);
return true;
}
#ifdef CONFIG_SBUS
void sbus_set_sbus64(struct device *dev, int x)
{
printk("sbus_set_sbus64: unsupported\n");
}
EXPORT_SYMBOL(sbus_set_sbus64);
static int __init sparc_register_ioport(void)
{
register_proc_sparc_ioport();
return 0;
}
arch_initcall(sparc_register_ioport);
#endif /* CONFIG_SBUS */
/* Allocate and map kernel buffer using consistent mode DMA for a device.
* hwdev should be valid struct pci_dev pointer for PCI devices.
*/
void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t gfp, unsigned long attrs)
{
unsigned long addr;
void *va;
if (!size || size > 256 * 1024) /* __get_free_pages() limit */
return NULL;
size = PAGE_ALIGN(size);
va = (void *) __get_free_pages(gfp | __GFP_ZERO, get_order(size));
if (!va) {
printk("%s: no %zd pages\n", __func__, size >> PAGE_SHIFT);
return NULL;
}
addr = sparc_dma_alloc_resource(dev, size);
if (!addr)
goto err_nomem;
srmmu_mapiorange(0, virt_to_phys(va), addr, size);
*dma_handle = virt_to_phys(va);
return (void *)addr;
err_nomem:
free_pages((unsigned long)va, get_order(size));
return NULL;
}
/* Free and unmap a consistent DMA buffer.
* cpu_addr is what was returned arch_dma_alloc, size must be the same as what
* was passed into arch_dma_alloc, and likewise dma_addr must be the same as
* what *dma_ndler was set to.
*
* References to the memory and mappings associated with cpu_addr/dma_addr
* past this call are illegal.
*/
void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t dma_addr, unsigned long attrs)
{
if (!sparc_dma_free_resource(cpu_addr, PAGE_ALIGN(size)))
return;
dma_make_coherent(dma_addr, size);
srmmu_unmapiorange((unsigned long)cpu_addr, size);
free_pages((unsigned long)phys_to_virt(dma_addr), get_order(size));
}
/* IIep is write-through, not flushing on cpu to device transfer. */
void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
enum dma_data_direction dir)
{
if (dir != PCI_DMA_TODEVICE)
dma_make_coherent(paddr, PAGE_ALIGN(size));
}
#ifdef CONFIG_PROC_FS
static int sparc_io_proc_show(struct seq_file *m, void *v)
{
struct resource *root = m->private, *r;
const char *nm;
for (r = root->child; r != NULL; r = r->sibling) {
if ((nm = r->name) == NULL) nm = "???";
seq_printf(m, "%016llx-%016llx: %s\n",
(unsigned long long)r->start,
(unsigned long long)r->end, nm);
}
return 0;
}
#endif /* CONFIG_PROC_FS */
static void register_proc_sparc_ioport(void)
{
#ifdef CONFIG_PROC_FS
proc_create_single_data("io_map", 0, NULL, sparc_io_proc_show,
&sparc_iomap);
proc_create_single_data("dvma_map", 0, NULL, sparc_io_proc_show,
&_sparc_dvma);
#endif
}