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numa/emulation: Check emulated zones around the CMA window

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... Make sure CMA zones do not straddle the emulated NUMA nodes ...

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
This commit is contained in:
Tvrtko Ursulin
2024-07-29 16:53:18 +01:00
committed by Phil Elwell
parent 56fda5adce
commit a27d76f451
3 changed files with 51 additions and 0 deletions
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5
drivers/base/numa_emulation.c
View File

@@ -7,6 +7,7 @@
* Author: Maíra Canal <mcanal@igalia.com>
* Author: Tvrtko Ursulin <tursulin@igalia.com>
*/
#include <linux/cma.h>
#include <linux/memblock.h>
#include "numa_emulation.h"
@@ -55,6 +56,10 @@ int __init numa_emu_init(void)
if (i == (emu_nodes - 1) && e != end)
e = end;
ret = cma_check_range(&s, &e);
if (ret)
return ret;
pr_info("Faking a node at [mem %pap-%pap]\n", &s, &e);
ret = numa_add_memblk(i, s, e + 1);
if (ret) {

10
include/linux/cma.h
View File

@@ -56,4 +56,14 @@ extern bool cma_release(struct cma *cma, const struct page *pages, unsigned long
extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data);
extern void cma_reserve_pages_on_error(struct cma *cma);
#ifdef CONFIG_CMA
extern int cma_check_range(u64 *start, u64 *end);
#else
static inline int cma_check_range(u64 *start, u64 *end)
{
return 0;
}
#endif
#endif

36
mm/cma.c
View File

@@ -587,3 +587,39 @@ int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data)
return 0;
}
struct cma_check_range_data {
u64 start, end;
};
static int check_range(struct cma *cma_, void *data)
{
struct cma_check_range_data *range = data;
struct cma_check_range_data cma;
bool starts_in_range;
bool ends_in_range;
cma.start = cma_get_base(cma_);
cma.end = cma.start + cma_get_size(cma_) - 1;
starts_in_range = cma.start >= range->start && cma.start <= range->end;
ends_in_range = cma.end >= range->start && cma.end <= range->end;
if (starts_in_range == ends_in_range)
return 0;
pr_notice("CMA %s [%llx-%llx] straddles range [%llx-%llx]\n",
cma_->name, cma.start, cma.end, range->start, range->end);
return -EINVAL;
}
int cma_check_range(u64 *start, u64 *end)
{
struct cma_check_range_data range = {
.start = *start,
.end = *end,
};
return cma_for_each_area(check_range, &range);
}