[Intel-gfx] [PATCH 3/3] drm/i915: error out on platform with small-bar and CCS

[Nirmoy Das]

Until we enable small-bar, we can't support CCS so error
out gracefully on such platforms.

Signed-off-by: Nirmoy Das <nirmoy.das at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_region_lmem.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_region_lmem.c b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
index cd105ec10429..43caf8052ffb 100644
--- a/drivers/gpu/drm/i915/gt/intel_region_lmem.c
+++ b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
@@ -111,6 +111,13 @@ 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, "CCS isn't supported on platforms with small-bar\n");
+			return ERR_PTR(-EINVAL);
+
+		}
+
 		if (GEM_WARN_ON(lmem_size < flat_ccs_base))
 			return ERR_PTR(-EIO);
 
-- 
2.35.1