On 5/25/22 20:43, Matthew Auld wrote:
With the uAPI in place we should now have enough in place to ensure a
working system on small BAR configurations.
Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx>
Cc: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
Cc: Lionel Landwerlin <lionel.g.landwerlin@xxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx>
Cc: Jon Bloomfield <jon.bloomfield@xxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Jordan Justen <jordan.l.justen@xxxxxxxxx>
Cc: Kenneth Graunke <kenneth@xxxxxxxxxxxxx>
Cc: Akeem G Abodunrin <akeem.g.abodunrin@xxxxxxxxx>
---
drivers/gpu/drm/i915/gt/intel_region_lmem.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_region_lmem.c b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
index e9c12e0d6f59..6c6f8cbd7321 100644
--- a/drivers/gpu/drm/i915/gt/intel_region_lmem.c
+++ b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
@@ -111,12 +111,6 @@ static struct intel_memory_region *setup_lmem(struct intel_gt *gt)
flat_ccs_base = intel_gt_read_register(gt, XEHPSDV_FLAT_CCS_BASE_ADDR);
flat_ccs_base = (flat_ccs_base >> XEHPSDV_CCS_BASE_SHIFT) * SZ_64K;
- /* FIXME: Remove this when we have small-bar enabled */
- if (pci_resource_len(pdev, 2) < lmem_size) {
- drm_err(&i915->drm, "System requires small-BAR support, which is currently unsupported on this kernel\n");
- return ERR_PTR(-EINVAL);
- }
-
if (GEM_WARN_ON(lmem_size < flat_ccs_base))
return ERR_PTR(-EIO);
@@ -169,6 +163,10 @@ static struct intel_memory_region *setup_lmem(struct intel_gt *gt)
drm_info(&i915->drm, "Local memory available: %pa\n",
&lmem_size);
+ if (io_size < lmem_size)
+ drm_info(&i915->drm, "Using a reduced BAR size of %lluMiB. Consider enabling the full BAR size if available in the BIOS.\n",
+ (u64)io_size >> 20);
+
Hmm. I wonder what BIOS uis typically call the mappable portion of VRAM.
I'll se if I can check that on my DG1 system. Might be that an average
user misinterprets "full BAR".
/Thomas
return mem;
err_region_put:
