[Intel-gfx] [PATCH v3 2/8] drm/i915: setup the LMEM region

[Matthew Auld]

Hook up the LMEM region. Addresses will start from zero, and for CPU
access we get LMEM_BAR which is just a 1:1 mapping of said region.

Based on a patch from Michel Thierry.

v2 by Jani:
- use intel_uncore_read/intel_uncore_write
- remove trailing blank line

v3: s/drm_info/drm_dbg for info which in non-pertinent for the user

Cc: Lucas De Marchi <lucas.demarchi at intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Signed-off-by: Matthew Auld <matthew.auld at intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_gt.c          |  4 ++-
 drivers/gpu/drm/i915/gt/intel_region_lmem.c | 35 +++++++++++++++++++++
 drivers/gpu/drm/i915/gt/intel_region_lmem.h |  2 ++
 3 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
index edbee9991248..9ac67e0534b7 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
@@ -46,7 +46,9 @@ int intel_gt_probe_lmem(struct intel_gt *gt)
 	int id;
 	int err;
 
-	mem = intel_gt_setup_fake_lmem(gt);
+	mem = intel_gt_setup_lmem(gt);
+	if (mem == ERR_PTR(-ENODEV))
+		mem = intel_gt_setup_fake_lmem(gt);
 	if (IS_ERR(mem)) {
 		err = PTR_ERR(mem);
 		if (err == -ENODEV)
diff --git a/drivers/gpu/drm/i915/gt/intel_region_lmem.c b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
index a2401e1fe1a3..b3d1d0abb956 100644
--- a/drivers/gpu/drm/i915/gt/intel_region_lmem.c
+++ b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
@@ -142,3 +142,38 @@ intel_gt_setup_fake_lmem(struct intel_gt *gt)
 
 	return mem;
 }
+
+static struct intel_memory_region *setup_lmem(struct intel_gt *gt)
+{
+	struct drm_i915_private *i915 = gt->i915;
+	struct pci_dev *pdev = i915->drm.pdev;
+	struct intel_memory_region *mem;
+	resource_size_t io_start;
+	resource_size_t size;
+
+	if (!IS_DGFX(i915))
+		return ERR_PTR(-ENODEV);
+
+	io_start = pci_resource_start(pdev, 2);
+	size = pci_resource_len(pdev, 2);
+
+	mem = intel_memory_region_create(i915,
+					 0,
+					 size,
+					 I915_GTT_PAGE_SIZE_4K,
+					 io_start,
+					 &intel_region_lmem_ops);
+	if (!IS_ERR(mem)) {
+		drm_dbg(&i915->drm, "Local memory: %pR\n", &mem->region);
+		drm_dbg(&i915->drm, "Local memory IO start: %pa\n",
+			&mem->io_start);
+		drm_info(&i915->drm, "Local memory available: %pa\n", &size);
+	}
+
+	return mem;
+}
+
+struct intel_memory_region *intel_gt_setup_lmem(struct intel_gt *gt)
+{
+	return setup_lmem(gt);
+}
diff --git a/drivers/gpu/drm/i915/gt/intel_region_lmem.h b/drivers/gpu/drm/i915/gt/intel_region_lmem.h
index a4baa0f077a1..062d0542ae34 100644
--- a/drivers/gpu/drm/i915/gt/intel_region_lmem.h
+++ b/drivers/gpu/drm/i915/gt/intel_region_lmem.h
@@ -8,6 +8,8 @@
 
 struct intel_gt;
 
+struct intel_memory_region *intel_gt_setup_lmem(struct intel_gt *gt);
+
 struct intel_memory_region *
 intel_gt_setup_fake_lmem(struct intel_gt *gt);
 
-- 
2.26.2