[PATCH v3 15/15] drm/i915/lmem: don't treat small BAR as an error

[Matthew Auld <matthew.auld@intel.com>]

Just pass along the probed io_size. The backend should be able to
utilize the entire range here, even if some of it is non-mappable.

It does leave open with what to do with stolen local-memory.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
---
 drivers/gpu/drm/i915/gt/intel_region_lmem.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_region_lmem.c b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
index 01838b8ce4c7..ad3cf348b4a8 100644
--- a/drivers/gpu/drm/i915/gt/intel_region_lmem.c
+++ b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
@@ -201,6 +201,7 @@ static struct intel_memory_region *setup_lmem(struct intel_gt *gt)
 	struct intel_memory_region *mem;
 	resource_size_t min_page_size;
 	resource_size_t io_start;
+	resource_size_t io_size;
 	resource_size_t lmem_size;
 	int err;
 
@@ -211,7 +212,8 @@ static struct intel_memory_region *setup_lmem(struct intel_gt *gt)
 	lmem_size = intel_uncore_read64(uncore, GEN12_GSMBASE);
 
 	io_start = pci_resource_start(pdev, 2);
-	if (GEM_WARN_ON(lmem_size > pci_resource_len(pdev, 2)))
+	io_size = min(pci_resource_len(pdev, 2), lmem_size);
+	if (!io_size)
 		return ERR_PTR(-ENODEV);
 
 	min_page_size = HAS_64K_PAGES(i915) ? I915_GTT_PAGE_SIZE_64K :
@@ -221,7 +223,7 @@ static struct intel_memory_region *setup_lmem(struct intel_gt *gt)
 					 lmem_size,
 					 min_page_size,
 					 io_start,
-					 lmem_size,
+					 io_size,
 					 INTEL_MEMORY_LOCAL,
 					 0,
 					 &intel_region_lmem_ops);
-- 
2.34.1