From 0da9493e841b92fc08c2d73612a9b0be285a1be0 Mon Sep 17 00:00:00 2001 From: Matthew Auld Date: Wed, 5 Oct 2022 16:31:48 +0100 Subject: [PATCH] drm/i915: restore stolen memory behaviour for DG2 Restore the previous behaviour here where we compare the pci_resource_len() with the actual lmem_size, and not the dsm size, since dsm here is just some subset snipped off the end of the lmem. Otherwise we will incorrectly report an io_size > 0 on small-bar systems. It doesn't looks like MTL is expecting small-bar with its stolen memory, based on: GEM_BUG_ON(pci_resource_len(pdev, GEN12_LMEM_BAR) != SZ_256M) GEM_BUG_ON((dsm_size + SZ_8M) > lmem_size) So just move the HAS_BAR2_SMEM_STOLEN() check first, which then ignores the small bar part, and we can go back to checking lmem_size against the BAR size. Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/7007 Fixes: dbb2ffbfd708 ("drm/i915/mtl: enable local stolen memory") Signed-off-by: Matthew Auld Cc: Aravind Iddamsetty Cc: Lucas De Marchi Cc: Matt Roper Reviewed-by: Lucas De Marchi Link: https://patchwork.freedesktop.org/patch/msgid/20221005153148.758822-2-matthew.auld@intel.com --- drivers/gpu/drm/i915/gem/i915_gem_stolen.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c index 2c4922961f33..1e00cf4d3ace 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c @@ -917,11 +917,11 @@ i915_gem_stolen_lmem_setup(struct drm_i915_private *i915, u16 type, } io_size = dsm_size; - if (pci_resource_len(pdev, GEN12_LMEM_BAR) < dsm_size) { + if (HAS_BAR2_SMEM_STOLEN(i915)) { + io_start = pci_resource_start(pdev, GEN12_LMEM_BAR) + SZ_8M; + } else if (pci_resource_len(pdev, GEN12_LMEM_BAR) < lmem_size) { io_start = 0; io_size = 0; - } else if (HAS_BAR2_SMEM_STOLEN(i915)) { - io_start = pci_resource_start(pdev, GEN12_LMEM_BAR) + SZ_8M; } else { io_start = pci_resource_start(pdev, GEN12_LMEM_BAR) + dsm_base; }