[Intel-gfx] [PATCH v2 1/3] drm/i915: Add missing mask when reading GEN12_DSMBASE

[Lucas De Marchi]

DSMBASE register is defined so BDSM bitfield contains the bits 63 to 20
of the base address of stolen. For the supported platforms bits 0-19 are
zero but that may not be true in future. Add the missing mask.

v2: Use REG_GENMASK64()

Acked-by: Aravind Iddamsetty <aravind.iddamse...@intel.com>
Reviewed-by: Caz Yokoyama <c...@caztech.com>
Signed-off-by: Lucas De Marchi <lucas.demar...@intel.com>

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c 
b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
index acc561c0f0aa..3665f9b035bb 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
@@ -814,7 +814,7 @@ i915_gem_stolen_lmem_setup(struct drm_i915_private *i915, 
u16 type,
                return ERR_PTR(-ENXIO);
 
        /* Use DSM base address instead for stolen memory */
-       dsm_base = intel_uncore_read64(uncore, GEN12_DSMBASE);
+       dsm_base = intel_uncore_read64(uncore, GEN12_DSMBASE) & GEN12_BDSM_MASK;
        if (IS_DG1(uncore->i915)) {
                lmem_size = pci_resource_len(pdev, GEN12_LMEM_BAR);
                if (WARN_ON(lmem_size < dsm_base))
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 1a9bd829fc7e..9584a50ed612 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7953,6 +7953,7 @@ enum skl_power_gate {
 
 #define GEN12_GSMBASE                  _MMIO(0x108100)
 #define GEN12_DSMBASE                  _MMIO(0x1080C0)
+#define   GEN12_BDSM_MASK              REG_GENMASK64(63, 20)
 
 #define XEHP_CLOCK_GATE_DIS            _MMIO(0x101014)
 #define   SGSI_SIDECLK_DIS             REG_BIT(17)

-- 
b4 0.10.0-dev-bbe61