Commit eef015c8 authored by Chris Metcalf's avatar Chris Metcalf

arch/tile: enable ZONE_DMA for tilegx

This is required for PCI root complex legacy support and USB OHCI root
complex support.  With this change tilegx now supports allocating memory
whose PA fits in 32 bits.
Signed-off-by: default avatarChris Metcalf <cmetcalf@tilera.com>
parent bbaa22c3
......@@ -212,6 +212,9 @@ config HIGHMEM
If unsure, say "true".
config ZONE_DMA
def_bool y
# We do not currently support disabling NUMA.
config NUMA
bool # "NUMA Memory Allocation and Scheduler Support"
......
......@@ -45,14 +45,17 @@ void *dma_alloc_coherent(struct device *dev,
gfp |= __GFP_ZERO;
/*
* By forcing NUMA node 0 for 32-bit masks we ensure that the
* high 32 bits of the resulting PA will be zero. If the mask
* size is, e.g., 24, we may still not be able to guarantee a
* suitable memory address, in which case we will return NULL.
* But such devices are uncommon.
* If the mask specifies that the memory be in the first 4 GB, then
* we force the allocation to come from the DMA zone. We also
* force the node to 0 since that's the only node where the DMA
* zone isn't empty. If the mask size is smaller than 32 bits, we
* may still not be able to guarantee a suitable memory address, in
* which case we will return NULL. But such devices are uncommon.
*/
if (dma_mask <= DMA_BIT_MASK(32))
if (dma_mask <= DMA_BIT_MASK(32)) {
gfp |= GFP_DMA;
node = 0;
}
pg = homecache_alloc_pages_node(node, gfp, order, PAGE_HOME_DMA);
if (pg == NULL)
......
......@@ -658,6 +658,8 @@ static void __init zone_sizes_init(void)
unsigned long zones_size[MAX_NR_ZONES] = { 0 };
int size = percpu_size();
int num_cpus = smp_height * smp_width;
const unsigned long dma_end = (1UL << (32 - PAGE_SHIFT));
int i;
for (i = 0; i < num_cpus; ++i)
......@@ -729,6 +731,14 @@ static void __init zone_sizes_init(void)
zones_size[ZONE_NORMAL] = end - start;
#endif
if (start < dma_end) {
zones_size[ZONE_DMA] = min(zones_size[ZONE_NORMAL],
dma_end - start);
zones_size[ZONE_NORMAL] -= zones_size[ZONE_DMA];
} else {
zones_size[ZONE_DMA] = 0;
}
/* Take zone metadata from controller 0 if we're isolnode. */
if (node_isset(i, isolnodes))
NODE_DATA(i)->bdata = &bootmem_node_data[0];
......@@ -738,7 +748,7 @@ static void __init zone_sizes_init(void)
PFN_UP(node_percpu[i]));
/* Track the type of memory on each node */
if (zones_size[ZONE_NORMAL])
if (zones_size[ZONE_NORMAL] || zones_size[ZONE_DMA])
node_set_state(i, N_NORMAL_MEMORY);
#ifdef CONFIG_HIGHMEM
if (end != start)
......
......@@ -733,16 +733,15 @@ static void __init set_non_bootmem_pages_init(void)
for_each_zone(z) {
unsigned long start, end;
int nid = z->zone_pgdat->node_id;
#ifdef CONFIG_HIGHMEM
int idx = zone_idx(z);
#endif
start = z->zone_start_pfn;
if (start == 0)
continue; /* bootmem */
end = start + z->spanned_pages;
if (idx == ZONE_NORMAL) {
BUG_ON(start != node_start_pfn[nid]);
start = node_free_pfn[nid];
}
start = max(start, node_free_pfn[nid]);
start = max(start, max_low_pfn);
#ifdef CONFIG_HIGHMEM
if (idx == ZONE_HIGHMEM)
totalhigh_pages += z->spanned_pages;
......
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