From: Thomas Hellström Date: Wed, 5 Mar 2025 09:22:20 +0000 (+0100) Subject: drm/xe: Increase the XE_PL_TT watermark X-Git-Tag: v6.15-rc1~120^2~13^2~13 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=d2d5f6d578848f13b1d01abd4e9a2452e5602586;p=thirdparty%2Fkernel%2Flinux.git drm/xe: Increase the XE_PL_TT watermark The XE_PL_TT watermark was set to 50% of system memory. The idea behind that was unclear since the net effect is that TT memory will be evicted to TTM_PL_SYSTEM memory if that watermark is exceeded, requiring PPGTT rebinds and dma remapping. But there is no similar watermark for TTM_PL_1SYSTEM memory. The TTM functionality that tries to swap out system memory to shmem objects if a 50% limit of total system memory is reached is orthogonal to this, and with the shrinker added, it's no longer in effect. Replace the 50% TTM_PL_TT limit with a 100% limit, in effect allowing all graphics memory to be bound to the device unless it has been swapped out by the shrinker. Signed-off-by: Thomas Hellström Reviewed-by: Matthew Brost Link: https://lore.kernel.org/intel-xe/20250305092220.123405-8-thomas.hellstrom@linux.intel.com --- diff --git a/drivers/gpu/drm/xe/xe_ttm_sys_mgr.c b/drivers/gpu/drm/xe/xe_ttm_sys_mgr.c index 9844a8edbfe19..d38b91872da3c 100644 --- a/drivers/gpu/drm/xe/xe_ttm_sys_mgr.c +++ b/drivers/gpu/drm/xe/xe_ttm_sys_mgr.c @@ -108,9 +108,8 @@ int xe_ttm_sys_mgr_init(struct xe_device *xe) u64 gtt_size; si_meminfo(&si); + /* Potentially restrict amount of TT memory here. */ gtt_size = (u64)si.totalram * si.mem_unit; - /* TTM limits allocation of all TTM devices by 50% of system memory */ - gtt_size /= 2; man->use_tt = true; man->func = &xe_ttm_sys_mgr_func;