[Intel-gfx] [RFC-v6 20/21] drm/i915/pxp: Add PXP-related registers into allowlist

[Huang, Sean Z]

Add several PXP-related reg into allowlist to allow user space
driver to read the those register values.

Signed-off-by: Huang, Sean Z <sean.z.huang at intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h     |  6 ++++
 drivers/gpu/drm/i915/intel_uncore.c | 50 ++++++++++++++++++++---------
 2 files changed, 41 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 0ea7e2a402ae..bcb7eb7a0e3c 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -12425,4 +12425,10 @@ enum skl_power_gate {
 #define TGL_ROOT_DEVICE_SKU_ULX		0x2
 #define TGL_ROOT_DEVICE_SKU_ULT		0x4
 
+/* Registers for allowlist check */
+#define PXP_REG_01_LOWERBOUND		_MMIO(0x32260)
+#define PXP_REG_01_UPPERBOUND		_MMIO(0x32268)
+#define PXP_REG_02_LOWERBOUND		_MMIO(0x32670)
+#define PXP_REG_02_UPPERBOUND		_MMIO(0x32678)
+
 #endif /* _I915_REG_H_ */
diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 9ac501bcfdad..dc97ec240571 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -1990,16 +1990,34 @@ void intel_uncore_fini_mmio(struct intel_uncore *uncore)
 }
 
 static const struct reg_whitelist {
-	i915_reg_t offset_ldw;
+	i915_reg_t offset_ldw_lowerbound;
+	i915_reg_t offset_ldw_upperbound;
 	i915_reg_t offset_udw;
 	u16 gen_mask;
 	u8 size;
-} reg_read_whitelist[] = { {
-	.offset_ldw = RING_TIMESTAMP(RENDER_RING_BASE),
+} reg_read_whitelist[] = {
+	{
+	.offset_ldw_lowerbound = RING_TIMESTAMP(RENDER_RING_BASE),
+	.offset_ldw_upperbound = RING_TIMESTAMP(RENDER_RING_BASE),
 	.offset_udw = RING_TIMESTAMP_UDW(RENDER_RING_BASE),
 	.gen_mask = INTEL_GEN_MASK(4, 12),
 	.size = 8
-} };
+	},
+	{
+	.offset_ldw_lowerbound = PXP_REG_01_LOWERBOUND,
+	.offset_ldw_upperbound = PXP_REG_01_UPPERBOUND,
+	.offset_udw = {0},
+	.gen_mask = INTEL_GEN_MASK(4, 12),
+	.size = 4
+	},
+	{
+	.offset_ldw_lowerbound = PXP_REG_02_LOWERBOUND,
+	.offset_ldw_upperbound = PXP_REG_02_UPPERBOUND,
+	.offset_udw = {0},
+	.gen_mask = INTEL_GEN_MASK(4, 12),
+	.size = 4
+	}
+};
 
 int i915_reg_read_ioctl(struct drm_device *dev,
 			void *data, struct drm_file *file)
@@ -2012,18 +2030,22 @@ int i915_reg_read_ioctl(struct drm_device *dev,
 	unsigned int flags;
 	int remain;
 	int ret = 0;
+	i915_reg_t offset_ldw;
 
 	entry = reg_read_whitelist;
 	remain = ARRAY_SIZE(reg_read_whitelist);
 	while (remain) {
-		u32 entry_offset = i915_mmio_reg_offset(entry->offset_ldw);
+		u32 entry_offset_lb = i915_mmio_reg_offset(entry->offset_ldw_lowerbound);
+		u32 entry_offset_ub = i915_mmio_reg_offset(entry->offset_ldw_upperbound);
 
 		GEM_BUG_ON(!is_power_of_2(entry->size));
 		GEM_BUG_ON(entry->size > 8);
-		GEM_BUG_ON(entry_offset & (entry->size - 1));
+		GEM_BUG_ON(entry_offset_lb & (entry->size - 1));
+		GEM_BUG_ON(entry_offset_ub & (entry->size - 1));
 
 		if (INTEL_INFO(i915)->gen_mask & entry->gen_mask &&
-		    entry_offset == (reg->offset & -entry->size))
+		    entry_offset_lb <= (reg->offset & -entry->size) &&
+		    (reg->offset & -entry->size) <= entry_offset_ub)
 			break;
 		entry++;
 		remain--;
@@ -2033,23 +2055,21 @@ int i915_reg_read_ioctl(struct drm_device *dev,
 		return -EINVAL;
 
 	flags = reg->offset & (entry->size - 1);
+	offset_ldw = _MMIO(reg->offset - flags);
 
 	with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
 		if (entry->size == 8 && flags == I915_REG_READ_8B_WA)
 			reg->val = intel_uncore_read64_2x32(uncore,
-							    entry->offset_ldw,
+							    offset_ldw,
 							    entry->offset_udw);
 		else if (entry->size == 8 && flags == 0)
-			reg->val = intel_uncore_read64(uncore,
-						       entry->offset_ldw);
+			reg->val = intel_uncore_read64(uncore, offset_ldw);
 		else if (entry->size == 4 && flags == 0)
-			reg->val = intel_uncore_read(uncore, entry->offset_ldw);
+			reg->val = intel_uncore_read(uncore, offset_ldw);
 		else if (entry->size == 2 && flags == 0)
-			reg->val = intel_uncore_read16(uncore,
-						       entry->offset_ldw);
+			reg->val = intel_uncore_read16(uncore, offset_ldw);
 		else if (entry->size == 1 && flags == 0)
-			reg->val = intel_uncore_read8(uncore,
-						      entry->offset_ldw);
+			reg->val = intel_uncore_read8(uncore, offset_ldw);
 		else
 			ret = -EINVAL;
 	}
-- 
2.17.1