[Mesa-dev] [PATCH 2/3] radv: Use a lower max offchip buffer count.

[Samuel Pitoiset]

On 9/3/18 2:35 AM, Bas Nieuwenhuizen wrote:
> No clue what gets fixed by this but both radeonsi and amdvlk do it.
> 
> CC: <mesa-stable at lists.freedesktop.org>
> ---
>   src/amd/vulkan/radv_device.c | 24 ++++++++++++++++++++++--
>   1 file changed, 22 insertions(+), 2 deletions(-)
> 
> diff --git a/src/amd/vulkan/radv_device.c b/src/amd/vulkan/radv_device.c
> index c300c88468a..3d208ab053d 100644
> --- a/src/amd/vulkan/radv_device.c
> +++ b/src/amd/vulkan/radv_device.c
> @@ -1901,10 +1901,30 @@ radv_get_hs_offchip_param(struct radv_device *device, uint32_t *max_offchip_buff
>   		device->physical_device->rad_info.family != CHIP_CARRIZO &&
>   		device->physical_device->rad_info.family != CHIP_STONEY;
>   	unsigned max_offchip_buffers_per_se = double_offchip_buffers ? 128 : 64;
> -	unsigned max_offchip_buffers = max_offchip_buffers_per_se *
> -		device->physical_device->rad_info.max_se;
> +	unsigned max_offchip_buffers;
>   	unsigned offchip_granularity;
>   	unsigned hs_offchip_param;
> +
> +	/*
> +	 * Per RadeonSI:
> +	 * This must be one less than the maximum number due to a hw limitation.
> +         * Various hardware bugs in SI, CIK, and GFX9 need this.
> +	 *
> +	 * Per AMDVLK:
> +	 * Vega10 should limit max_offchip_buffers to 508 (4 * 127).
> +	 * Gfx7 should limit max_offchip_buffers to 508
> +	 * Gfx6 should limit max_offchip_buffers to 126 (2 * 63)
> +	 *
> +	 * Follow AMDVLK here.
> +         */

Can you adjust the indentation here please?

Otherwise, series is:

Reviewed-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>

> +	if (device->physical_device->rad_info.family == CHIP_VEGA10 ||
> +	    device->physical_device->rad_info.chip_class == CIK ||
> +	    device->physical_device->rad_info.chip_class == SI)
> +		--max_offchip_buffers_per_se;
> +
> +	max_offchip_buffers = max_offchip_buffers_per_se *
> +		device->physical_device->rad_info.max_se;
> +
>   	switch (device->tess_offchip_block_dw_size) {
>   	default:
>   		assert(0);
>