Commit cce335ae authored by Ralf Baechle's avatar Ralf Baechle

[MIPS] 64-bit Sibyte kernels need DMA32.

Sibyte SOCs only have 32-bit PCI.  Due to the sparse use of the address
space only the first 1GB of memory is mapped at physical addresses
below 1GB.  If a system has more than 1GB of memory 32-bit DMA will
not be able to reach all of it.

For now this patch is good enough to keep Sibyte users happy but it seems
eventually something like swiotlb will be needed for Sibyte.
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 940f6b48
......@@ -515,6 +515,7 @@ config SIBYTE_SWARM
select SYS_SUPPORTS_HIGHMEM
select SYS_SUPPORTS_KGDB
select SYS_SUPPORTS_LITTLE_ENDIAN
select ZONE_DMA32 if 64BIT
config SIBYTE_LITTLESUR
bool "Sibyte BCM91250C2-LittleSur"
......@@ -565,6 +566,7 @@ config SIBYTE_BIGSUR
select SYS_SUPPORTS_BIG_ENDIAN
select SYS_SUPPORTS_HIGHMEM
select SYS_SUPPORTS_LITTLE_ENDIAN
select ZONE_DMA32 if 64BIT
config SNI_RM
bool "SNI RM200/300/400"
......@@ -1664,6 +1666,9 @@ config ARCH_DISCONTIGMEM_ENABLE
or have huge holes in the physical address space for other reasons.
See <file:Documentation/vm/numa> for more.
config ARCH_POPULATES_NODE_MAP
def_bool y
config ARCH_SPARSEMEM_ENABLE
bool
select SPARSEMEM_STATIC
......@@ -1969,6 +1974,9 @@ config I8253
config PCSPEAKER
bool
config ZONE_DMA32
bool
source "drivers/pcmcia/Kconfig"
source "drivers/pci/hotplug/Kconfig"
......
......@@ -269,7 +269,7 @@ static void __init bootmem_init(void)
static void __init bootmem_init(void)
{
unsigned long reserved_end;
unsigned long init_begin, reserved_end;
unsigned long mapstart = ~0UL;
unsigned long bootmap_size;
int i;
......@@ -342,6 +342,35 @@ static void __init bootmem_init(void)
*/
bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
min_low_pfn, max_low_pfn);
init_begin = PFN_UP(__pa_symbol(&__init_begin));
for (i = 0; i < boot_mem_map.nr_map; i++) {
unsigned long start, end;
start = PFN_UP(boot_mem_map.map[i].addr);
end = PFN_DOWN(boot_mem_map.map[i].addr
+ boot_mem_map.map[i].size);
if (start <= init_begin)
start = init_begin;
if (start >= end)
continue;
#ifndef CONFIG_HIGHMEM
if (end > max_low_pfn)
end = max_low_pfn;
/*
* ... finally, is the area going away?
*/
if (end <= start)
continue;
#endif
add_active_range(0, start, end);
}
/*
* Register fully available low RAM pages with the bootmem allocator.
*/
......
......@@ -40,16 +40,38 @@ static inline int cpu_is_noncoherent_r10000(struct device *dev)
current_cpu_type() == CPU_R12000);
}
static gfp_t massage_gfp_flags(const struct device *dev, gfp_t gfp)
{
/* ignore region specifiers */
gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
#ifdef CONFIG_ZONE_DMA32
if (dev == NULL)
gfp |= __GFP_DMA;
else if (dev->coherent_dma_mask < DMA_BIT_MASK(24))
gfp |= __GFP_DMA;
else
#endif
#ifdef CONFIG_ZONE_DMA32
if (dev->coherent_dma_mask < DMA_BIT_MASK(32))
gfp |= __GFP_DMA32;
else
#endif
;
/* Don't invoke OOM killer */
gfp |= __GFP_NORETRY;
return gfp;
}
void *dma_alloc_noncoherent(struct device *dev, size_t size,
dma_addr_t * dma_handle, gfp_t gfp)
{
void *ret;
/* ignore region specifiers */
gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
gfp = massage_gfp_flags(dev, gfp);
if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
gfp |= GFP_DMA;
ret = (void *) __get_free_pages(gfp, get_order(size));
if (ret != NULL) {
......@@ -67,11 +89,8 @@ void *dma_alloc_coherent(struct device *dev, size_t size,
{
void *ret;
/* ignore region specifiers */
gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
gfp = massage_gfp_flags(dev, gfp);
if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
gfp |= GFP_DMA;
ret = (void *) __get_free_pages(gfp, get_order(size));
if (ret) {
......@@ -343,7 +362,7 @@ int dma_supported(struct device *dev, u64 mask)
* so we can't guarantee allocations that must be
* within a tighter range than GFP_DMA..
*/
if (mask < 0x00ffffff)
if (mask < DMA_BIT_MASK(24))
return 0;
return 1;
......
......@@ -347,11 +347,8 @@ static int __init page_is_ram(unsigned long pagenr)
void __init paging_init(void)
{
unsigned long zones_size[MAX_NR_ZONES] = { 0, };
#ifndef CONFIG_FLATMEM
unsigned long zholes_size[MAX_NR_ZONES] = { 0, };
unsigned long i, j, pfn;
#endif
unsigned long max_zone_pfns[MAX_NR_ZONES];
unsigned long lastpfn;
pagetable_init();
......@@ -361,35 +358,27 @@ void __init paging_init(void)
kmap_coherent_init();
#ifdef CONFIG_ZONE_DMA
if (min_low_pfn < MAX_DMA_PFN && MAX_DMA_PFN <= max_low_pfn) {
zones_size[ZONE_DMA] = MAX_DMA_PFN - min_low_pfn;
zones_size[ZONE_NORMAL] = max_low_pfn - MAX_DMA_PFN;
} else if (max_low_pfn < MAX_DMA_PFN)
zones_size[ZONE_DMA] = max_low_pfn - min_low_pfn;
else
max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
#endif
zones_size[ZONE_NORMAL] = max_low_pfn - min_low_pfn;
#ifdef CONFIG_ZONE_DMA32
max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
#endif
max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
lastpfn = max_low_pfn;
#ifdef CONFIG_HIGHMEM
zones_size[ZONE_HIGHMEM] = highend_pfn - highstart_pfn;
max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
lastpfn = highend_pfn;
if (cpu_has_dc_aliases && zones_size[ZONE_HIGHMEM]) {
if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) {
printk(KERN_WARNING "This processor doesn't support highmem."
" %ldk highmem ignored\n", zones_size[ZONE_HIGHMEM]);
zones_size[ZONE_HIGHMEM] = 0;
" %ldk highmem ignored\n",
(highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10));
max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn;
lastpfn = max_low_pfn;
}
#endif
#ifdef CONFIG_FLATMEM
free_area_init(zones_size);
#else
pfn = min_low_pfn;
for (i = 0; i < MAX_NR_ZONES; i++)
for (j = 0; j < zones_size[i]; j++, pfn++)
if (!page_is_ram(pfn))
zholes_size[i]++;
free_area_init_node(0, NODE_DATA(0), zones_size, 0, zholes_size);
#endif
free_area_init_nodes(max_zone_pfns);
}
static struct kcore_list kcore_mem, kcore_vmalloc;
......
......@@ -92,6 +92,7 @@
#define MAX_DMA_ADDRESS (PAGE_OFFSET + 0x01000000)
#endif
#define MAX_DMA_PFN PFN_DOWN(virt_to_phys((void *)MAX_DMA_ADDRESS))
#define MAX_DMA32_PFN (1UL << (32 - PAGE_SHIFT))
/* 8237 DMA controllers */
#define IO_DMA1_BASE 0x00 /* 8 bit slave DMA, channels 0..3 */
......
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