[PATCH 2/2] drm/amdgpu/gmc9: fix 64 bit division in partition code

[Alex Deucher]

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

Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c |  5 ++++-
 drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c   | 11 ++++++-----
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index d5958e8e3c16..76dadf181d4c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -818,11 +818,14 @@ 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,
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c 
b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index 938c8dba9057..d559e7bc0f09 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -1919,9 +1919,10 @@ gmc_v9_0_init_acpi_mem_ranges(struct amdgpu_device *adev,
        adev->gmc.num_mem_partitions = num_ranges;
 
        /* If there is only partition, don't use entire size */
-       if (adev->gmc.num_mem_partitions == 1)
-               mem_ranges[0].size =
-                       (mem_ranges[0].size * (mem_groups - 1) / mem_groups);
+       if (adev->gmc.num_mem_partitions == 1) {
+               mem_ranges[0].size = mem_ranges[0].size * (mem_groups - 1);
+               do_div(mem_ranges[0].size, mem_groups);
+       }
 }
 
 static void
@@ -1953,8 +1954,8 @@ gmc_v9_0_init_sw_mem_ranges(struct amdgpu_device *adev,
                break;
        }
 
-       size = (adev->gmc.real_vram_size >> AMDGPU_GPU_PAGE_SHIFT) /
-              adev->gmc.num_mem_partitions;
+       size = adev->gmc.real_vram_size >> AMDGPU_GPU_PAGE_SHIFT;
+       size /= adev->gmc.num_mem_partitions;
 
        for (i = 0; i < adev->gmc.num_mem_partitions; ++i) {
                mem_ranges[i].range.fpfn = start_addr;
-- 
2.40.1