From: Imre Deak <[email protected]> On DG1 A0/B0 steppings the first 1MB of local memory must be reserved. One reason for this is that the 0xA0000-0xB0000 range is not accessible by the display, probably since this region is redirected to another memory location for legacy VGA compatibility.
BSpec: 50586 Testcase: igt/kms_big_fb/linear-64bpp-rotate-0 v2: - Reserve the memory on B0 as well. v3: replace DRM_DEBUG/DRM_ERROR with drm_dbg/drm_err Signed-off-by: Imre Deak <[email protected]> Signed-off-by: Matthew Auld <[email protected]> --- drivers/gpu/drm/i915/gt/intel_region_lmem.c | 52 +++++++++++++++++++++ 1 file changed, 52 insertions(+) diff --git a/drivers/gpu/drm/i915/gt/intel_region_lmem.c b/drivers/gpu/drm/i915/gt/intel_region_lmem.c index 4da808e35ecb..3b66221abe01 100644 --- a/drivers/gpu/drm/i915/gt/intel_region_lmem.c +++ b/drivers/gpu/drm/i915/gt/intel_region_lmem.c @@ -138,6 +138,48 @@ intel_gt_setup_fake_lmem(struct intel_gt *gt) return mem; } +static void get_legacy_lowmem_region(struct intel_uncore *uncore, + u64 *start, u32 *size) +{ + *start = 0; + *size = 0; + + if (!IS_DG1_REVID(uncore->i915, DG1_REVID_A0, DG1_REVID_B0)) + return; + + *size = SZ_1M; + + drm_dbg(&uncore->i915->drm, "LMEM: reserved legacy low-memory [0x%llx-0x%llx]\n", + *start, *start + *size); +} + +static int reserve_lowmem_region(struct intel_uncore *uncore, + struct intel_memory_region *mem) +{ + u64 reserve_start; + u64 reserve_end; + u64 region_start; + u32 region_size; + int ret; + + get_legacy_lowmem_region(uncore, ®ion_start, ®ion_size); + reserve_start = region_start; + reserve_end = region_start + region_size; + + if (!reserve_end) + return 0; + + drm_dbg(&uncore->i915->drm, "LMEM: reserving low-memory region [0x%llx-0x%llx]\n", + reserve_start, reserve_end); + ret = i915_buddy_alloc_range(&mem->mm, &mem->reserved, + reserve_start, + reserve_end - reserve_start); + if (ret) + drm_err(&uncore->i915->drm, "LMEM: reserving low memory region failed\n"); + + return ret; +} + static struct intel_memory_region *setup_lmem(struct intel_gt *gt) { struct drm_i915_private *i915 = gt->i915; @@ -158,6 +200,16 @@ static struct intel_memory_region *setup_lmem(struct intel_gt *gt) I915_GTT_PAGE_SIZE_4K, io_start, &intel_region_lmem_ops); + if (!IS_ERR(mem)) { + int err; + + err = reserve_lowmem_region(uncore, mem); + if (err) { + intel_memory_region_put(mem); + return ERR_PTR(err); + } + } + if (!IS_ERR(mem)) { drm_dbg(&i915->drm, "Local memory: %pR\n", &mem->region); drm_dbg(&i915->drm, "Local memory IO start: %pa\n", -- 2.26.2 _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
