This doesn't work on 32bit systems since totalram is a long (IIRC) and
so this will certainly overflow.
-- can you be more specific, how could the overflow happen?
Additional if I remember correctly we didn't ended the discussion on
what to do here with a conclusion.
-- ok, since it happens in anther mail list, we should stop talking about it here, you can send out your ideas there.
________________________________
å??件人: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> 代表 Christian König <deathsimple at vodafone.de>
å??é??æ?¶é?´: 2016å¹´7æ??21æ?¥ 16:53:05
�件人: Wang, Qingqing; amd-gfx at lists.freedesktop.org
主�: Re: [PATCH] drm/amdgpu: adjust gtt memory size
Am 21.07.2016 um 09:46 schrieb Ken Wang:
> Change-Id: If00d5b97ba9e30f9b7f68fdfc134a0f8b3ad2add
> Signed-off-by: Ken Wang <Qingqing.Wang at amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c | 7 ++++++-
> drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c | 7 ++++++-
> 2 files changed, 12 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
> index a3b6048..0b095d5 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
> @@ -336,6 +336,11 @@ static int gmc_v7_0_mc_init(struct amdgpu_device *adev)
> {
> u32 tmp;
> int chansize, numchan;
> + u64 sysmem_size;
> + struct sysinfo si;
> +
> + si_meminfo(&si);
> + sysmem_size = si.totalram * si.mem_unit;
This doesn't work on 32bit systems since totalram is a long (IIRC) and
so this will certainly overflow.
Additional if I remember correctly we didn't ended the discussion on
what to do here with a conclusion.
Regards,
Christian.
>
> /* Get VRAM informations */
> tmp = RREG32(mmMC_ARB_RAMCFG);
> @@ -392,7 +397,7 @@ static int gmc_v7_0_mc_init(struct amdgpu_device *adev)
> * size equal to the 1024 or vram, whichever is larger.
> */
> if (amdgpu_gart_size == -1)
> - adev->mc.gtt_size = max((1024ULL << 20), adev->mc.mc_vram_size);
> + adev->mc.gtt_size = max((1024ULL << 20), min(adev->mc.mc_vram_size, sysmem_size/2));
> else
> adev->mc.gtt_size = (uint64_t)amdgpu_gart_size << 20;
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
> index 02b6872..790bf7a 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
> @@ -413,6 +413,11 @@ static int gmc_v8_0_mc_init(struct amdgpu_device *adev)
> {
> u32 tmp;
> int chansize, numchan;
> + u64 sysmem_size;
> + struct sysinfo si;
> +
> + si_meminfo(&si);
> + sysmem_size = si.totalram * si.mem_unit;
>
> /* Get VRAM informations */
> tmp = RREG32(mmMC_ARB_RAMCFG);
> @@ -469,7 +474,7 @@ static int gmc_v8_0_mc_init(struct amdgpu_device *adev)
> * size equal to the 1024 or vram, whichever is larger.
> */
> if (amdgpu_gart_size == -1)
> - adev->mc.gtt_size = max((1024ULL << 20), adev->mc.mc_vram_size);
> + adev->mc.gtt_size = max((1024ULL << 20), min(adev->mc.mc_vram_size, sysmem_size/2));
> else
> adev->mc.gtt_size = (uint64_t)amdgpu_gart_size << 20;
>
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