[Intel-gfx] [PATCH i-g-t 2/5] gem_wsim: Round mmap to page size

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursu...@intel.com>

mmap(2) mandates size is page aligned.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursu...@intel.com>
---
 benchmarks/gem_wsim.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/benchmarks/gem_wsim.c b/benchmarks/gem_wsim.c
index 0a5abc08d8c2..57ceb983cf82 100644
--- a/benchmarks/gem_wsim.c
+++ b/benchmarks/gem_wsim.c
@@ -737,6 +737,7 @@ init_bb(struct w_step *w, unsigned int flags)
 {
        const unsigned int arb_period =
                        get_bb_sz(w->preempt_us) / sizeof(uint32_t);
+       const unsigned int mmap_len = ALIGN(w->bb_sz, 4096);
        unsigned int i;
        uint32_t *ptr;
 
@@ -746,12 +747,12 @@ init_bb(struct w_step *w, unsigned int flags)
        gem_set_domain(fd, w->bb_handle,
                       I915_GEM_DOMAIN_WC, I915_GEM_DOMAIN_WC);
 
-       ptr = gem_mmap__wc(fd, w->bb_handle, 0, w->bb_sz, PROT_WRITE);
+       ptr = gem_mmap__wc(fd, w->bb_handle, 0, mmap_len, PROT_WRITE);
 
        for (i = arb_period; i < w->bb_sz / sizeof(uint32_t); i += arb_period)
                ptr[i] = 0x5 << 23; /* MI_ARB_CHK */
 
-       munmap(ptr, w->bb_sz);
+       munmap(ptr, mmap_len);
 }
 
 static void
@@ -771,7 +772,7 @@ terminate_bb(struct w_step *w, unsigned int flags)
                batch_start -= 12 * sizeof(uint32_t);
 
        mmap_start = rounddown(batch_start, PAGE_SIZE);
-       mmap_len = w->bb_sz - mmap_start;
+       mmap_len = ALIGN(w->bb_sz - mmap_start, PAGE_SIZE);
 
        gem_set_domain(fd, w->bb_handle,
                       I915_GEM_DOMAIN_WC, I915_GEM_DOMAIN_WC);
-- 
2.19.1

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx