Re: [PATCH 16/19] drm/amd/amdgpu/amdgpu_kms: Remove 'struct drm_amdgpu_info_device dev_info' from the stack

From: Alex Deucher
Date: Mon Nov 09 2020 - 15:05:26 EST

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On Fri, Nov 6, 2020 at 4:50 PM Lee Jones <lee.jones@xxxxxxxxxx> wrote:
>
> Place it on the heap instead.
>
> Fixes the following W=1 kernel build warning(s):
>
> drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c: In function ‘amdgpu_info_ioctl’:
> drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c:979:1: warning: the frame size of 1128 bytes is larger than 1024 bytes [-Wframe-larger-than=]
>
> Cc: Alex Deucher <alexander.deucher@xxxxxxx>
> Cc: "Christian König" <christian.koenig@xxxxxxx>
> Cc: David Airlie <airlied@xxxxxxxx>
> Cc: Daniel Vetter <daniel@xxxxxxxx>
> Cc: amd-gfx@xxxxxxxxxxxxxxxxxxxxx
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx>

Applied. Thanks!

Alex

> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 104 +++++++++++++-----------
> 1 file changed, 55 insertions(+), 49 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> index 918d4e9c6461a..ef6fa5007d135 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> @@ -721,38 +721,42 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file
> return n ? -EFAULT : 0;
> }
> case AMDGPU_INFO_DEV_INFO: {
> - struct drm_amdgpu_info_device dev_info;
> + struct drm_amdgpu_info_device *dev_info;
> uint64_t vm_size;
> + int ret;
> +
> + dev_info = kzalloc(sizeof(*dev_info), GFP_KERNEL);
> + if (!dev_info)
> + return -ENOMEM;
>
> - memset(&dev_info, 0, sizeof(dev_info));
> - dev_info.device_id = dev->pdev->device;
> - dev_info.chip_rev = adev->rev_id;
> - dev_info.external_rev = adev->external_rev_id;
> - dev_info.pci_rev = dev->pdev->revision;
> - dev_info.family = adev->family;
> - dev_info.num_shader_engines = adev->gfx.config.max_shader_engines;
> - dev_info.num_shader_arrays_per_engine = adev->gfx.config.max_sh_per_se;
> + dev_info->device_id = dev->pdev->device;
> + dev_info->chip_rev = adev->rev_id;
> + dev_info->external_rev = adev->external_rev_id;
> + dev_info->pci_rev = dev->pdev->revision;
> + dev_info->family = adev->family;
> + dev_info->num_shader_engines = adev->gfx.config.max_shader_engines;
> + dev_info->num_shader_arrays_per_engine = adev->gfx.config.max_sh_per_se;
> /* return all clocks in KHz */
> - dev_info.gpu_counter_freq = amdgpu_asic_get_xclk(adev) * 10;
> + dev_info->gpu_counter_freq = amdgpu_asic_get_xclk(adev) * 10;
> if (adev->pm.dpm_enabled) {
> - dev_info.max_engine_clock = amdgpu_dpm_get_sclk(adev, false) * 10;
> - dev_info.max_memory_clock = amdgpu_dpm_get_mclk(adev, false) * 10;
> + dev_info->max_engine_clock = amdgpu_dpm_get_sclk(adev, false) * 10;
> + dev_info->max_memory_clock = amdgpu_dpm_get_mclk(adev, false) * 10;
> } else {
> - dev_info.max_engine_clock = adev->clock.default_sclk * 10;
> - dev_info.max_memory_clock = adev->clock.default_mclk * 10;
> + dev_info->max_engine_clock = adev->clock.default_sclk * 10;
> + dev_info->max_memory_clock = adev->clock.default_mclk * 10;
> }
> - dev_info.enabled_rb_pipes_mask = adev->gfx.config.backend_enable_mask;
> - dev_info.num_rb_pipes = adev->gfx.config.max_backends_per_se *
> + dev_info->enabled_rb_pipes_mask = adev->gfx.config.backend_enable_mask;
> + dev_info->num_rb_pipes = adev->gfx.config.max_backends_per_se *
> adev->gfx.config.max_shader_engines;
> - dev_info.num_hw_gfx_contexts = adev->gfx.config.max_hw_contexts;
> - dev_info._pad = 0;
> - dev_info.ids_flags = 0;
> + dev_info->num_hw_gfx_contexts = adev->gfx.config.max_hw_contexts;
> + dev_info->_pad = 0;
> + dev_info->ids_flags = 0;
> if (adev->flags & AMD_IS_APU)
> - dev_info.ids_flags |= AMDGPU_IDS_FLAGS_FUSION;
> + dev_info->ids_flags |= AMDGPU_IDS_FLAGS_FUSION;
> if (amdgpu_mcbp || amdgpu_sriov_vf(adev))
> - dev_info.ids_flags |= AMDGPU_IDS_FLAGS_PREEMPTION;
> + dev_info->ids_flags |= AMDGPU_IDS_FLAGS_PREEMPTION;
> if (amdgpu_is_tmz(adev))
> - dev_info.ids_flags |= AMDGPU_IDS_FLAGS_TMZ;
> + dev_info->ids_flags |= AMDGPU_IDS_FLAGS_TMZ;
>
> vm_size = adev->vm_manager.max_pfn * AMDGPU_GPU_PAGE_SIZE;
> vm_size -= AMDGPU_VA_RESERVED_SIZE;
> @@ -762,45 +766,47 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file
> adev->vce.fw_version < AMDGPU_VCE_FW_53_45)
> vm_size = min(vm_size, 1ULL << 40);
>
> - dev_info.virtual_address_offset = AMDGPU_VA_RESERVED_SIZE;
> - dev_info.virtual_address_max =
> + dev_info->virtual_address_offset = AMDGPU_VA_RESERVED_SIZE;
> + dev_info->virtual_address_max =
> min(vm_size, AMDGPU_GMC_HOLE_START);
>
> if (vm_size > AMDGPU_GMC_HOLE_START) {
> - dev_info.high_va_offset = AMDGPU_GMC_HOLE_END;
> - dev_info.high_va_max = AMDGPU_GMC_HOLE_END | vm_size;
> + dev_info->high_va_offset = AMDGPU_GMC_HOLE_END;
> + dev_info->high_va_max = AMDGPU_GMC_HOLE_END | vm_size;
> }
> - dev_info.virtual_address_alignment = max((int)PAGE_SIZE, AMDGPU_GPU_PAGE_SIZE);
> - dev_info.pte_fragment_size = (1 << adev->vm_manager.fragment_size) * AMDGPU_GPU_PAGE_SIZE;
> - dev_info.gart_page_size = AMDGPU_GPU_PAGE_SIZE;
> - dev_info.cu_active_number = adev->gfx.cu_info.number;
> - dev_info.cu_ao_mask = adev->gfx.cu_info.ao_cu_mask;
> - dev_info.ce_ram_size = adev->gfx.ce_ram_size;
> - memcpy(&dev_info.cu_ao_bitmap[0], &adev->gfx.cu_info.ao_cu_bitmap[0],
> + dev_info->virtual_address_alignment = max((int)PAGE_SIZE, AMDGPU_GPU_PAGE_SIZE);
> + dev_info->pte_fragment_size = (1 << adev->vm_manager.fragment_size) * AMDGPU_GPU_PAGE_SIZE;
> + dev_info->gart_page_size = AMDGPU_GPU_PAGE_SIZE;
> + dev_info->cu_active_number = adev->gfx.cu_info.number;
> + dev_info->cu_ao_mask = adev->gfx.cu_info.ao_cu_mask;
> + dev_info->ce_ram_size = adev->gfx.ce_ram_size;
> + memcpy(&dev_info->cu_ao_bitmap[0], &adev->gfx.cu_info.ao_cu_bitmap[0],
> sizeof(adev->gfx.cu_info.ao_cu_bitmap));
> - memcpy(&dev_info.cu_bitmap[0], &adev->gfx.cu_info.bitmap[0],
> + memcpy(&dev_info->cu_bitmap[0], &adev->gfx.cu_info.bitmap[0],
> sizeof(adev->gfx.cu_info.bitmap));
> - dev_info.vram_type = adev->gmc.vram_type;
> - dev_info.vram_bit_width = adev->gmc.vram_width;
> - dev_info.vce_harvest_config = adev->vce.harvest_config;
> - dev_info.gc_double_offchip_lds_buf =
> + dev_info->vram_type = adev->gmc.vram_type;
> + dev_info->vram_bit_width = adev->gmc.vram_width;
> + dev_info->vce_harvest_config = adev->vce.harvest_config;
> + dev_info->gc_double_offchip_lds_buf =
> adev->gfx.config.double_offchip_lds_buf;
> - dev_info.wave_front_size = adev->gfx.cu_info.wave_front_size;
> - dev_info.num_shader_visible_vgprs = adev->gfx.config.max_gprs;
> - dev_info.num_cu_per_sh = adev->gfx.config.max_cu_per_sh;
> - dev_info.num_tcc_blocks = adev->gfx.config.max_texture_channel_caches;
> - dev_info.gs_vgt_table_depth = adev->gfx.config.gs_vgt_table_depth;
> - dev_info.gs_prim_buffer_depth = adev->gfx.config.gs_prim_buffer_depth;
> - dev_info.max_gs_waves_per_vgt = adev->gfx.config.max_gs_threads;
> + dev_info->wave_front_size = adev->gfx.cu_info.wave_front_size;
> + dev_info->num_shader_visible_vgprs = adev->gfx.config.max_gprs;
> + dev_info->num_cu_per_sh = adev->gfx.config.max_cu_per_sh;
> + dev_info->num_tcc_blocks = adev->gfx.config.max_texture_channel_caches;
> + dev_info->gs_vgt_table_depth = adev->gfx.config.gs_vgt_table_depth;
> + dev_info->gs_prim_buffer_depth = adev->gfx.config.gs_prim_buffer_depth;
> + dev_info->max_gs_waves_per_vgt = adev->gfx.config.max_gs_threads;
>
> if (adev->family >= AMDGPU_FAMILY_NV)
> - dev_info.pa_sc_tile_steering_override =
> + dev_info->pa_sc_tile_steering_override =
> adev->gfx.config.pa_sc_tile_steering_override;
>
> - dev_info.tcc_disabled_mask = adev->gfx.config.tcc_disabled_mask;
> + dev_info->tcc_disabled_mask = adev->gfx.config.tcc_disabled_mask;
>
> - return copy_to_user(out, &dev_info,
> - min((size_t)size, sizeof(dev_info))) ? -EFAULT : 0;
> + ret = copy_to_user(out, dev_info,
> + min((size_t)size, sizeof(*dev_info))) ? -EFAULT : 0;
> + kfree(dev_info);
> + return ret;
> }
> case AMDGPU_INFO_VCE_CLOCK_TABLE: {
> unsigned i;
> --
> 2.25.1
>
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Next message: Alex Deucher: "Re: [PATCH 17/19] drm/radeon/radeon_kms: Fix misnaming of 'radeon_info_ioctl's dev param"
Previous message: Rob Herring: "Re: [PATCH 1/6] dt-bindings: interrupt-controller: Add binding for the Microsemi Luton interrupt controller"
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