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drm/amdgpu/gmc9: fix 64 bit division in partition code

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Rework logic or use do_div() to avoid problems on 32 bit.

v2: add a missing case for XCP macro
v3: fix out of bounds array access
v4: fix xcp handling harder

Acked-by: Guchun Chen <guchun.chen@amd.com> (v1)
Reviewed-by: Mukul Joshi <mukul.joshi@amd.com> (v3)
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher
2023-05-16 17:16:30 -04:00
parent 92ecb92ccc
commit 45b3a914d4
5 changed files with 35 additions and 13 deletions
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5
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
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@@ -814,11 +814,14 @@ static void amdgpu_ttm_gart_bind_gfx9_mqd(struct amdgpu_device *adev,
struct amdgpu_ttm_tt *gtt = (void *)ttm;
uint64_t total_pages = ttm->num_pages;
int num_xcc = max(1U, adev->gfx.num_xcc_per_xcp);
uint64_t page_idx, pages_per_xcc = total_pages / num_xcc;
uint64_t page_idx, pages_per_xcc;
int i;
uint64_t ctrl_flags = (flags & ~AMDGPU_PTE_MTYPE_VG10_MASK) |
AMDGPU_PTE_MTYPE_VG10(AMDGPU_MTYPE_NC);
pages_per_xcc = total_pages;
do_div(pages_per_xcc, num_xcc);
for (i = 0, page_idx = 0; i < num_xcc; i++, page_idx += pages_per_xcc) {
/* MQD page: use default flags */
amdgpu_gart_bind(adev,