From: Alex Deucher <alexander.deuc...@amd.com>
Helpful for debugging GPUVM errors as we can see what
hw block and page generated the fault in the log.
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
drivers/gpu/drm/radeon/cik.c | 32 ++++++++++++++++++++++++++++++--
drivers/gpu/drm/radeon/cikd.h | 16 ++++++++++++++++
2 files changed, 46 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c
index 27891d8..68b4fc5 100644
--- a/drivers/gpu/drm/radeon/cik.c
+++ b/drivers/gpu/drm/radeon/cik.c
@@ -4442,6 +4442,29 @@ void cik_vm_fini(struct radeon_device *rdev)
}
/**
+ * cik_vm_decode_fault - print human readable fault info
+ *
+ * @rdev: radeon_device pointer
+ * @status: VM_CONTEXT1_PROTECTION_FAULT_STATUS register value
+ * @addr: VM_CONTEXT1_PROTECTION_FAULT_ADDR register value
+ *
+ * Print human readable fault information (CIK).
+ */
+static void cik_vm_decode_fault(struct radeon_device *rdev,
+ u32 status, u32 addr, u32 mc_client)
+{
+ u32 mc_id = (status & MEMORY_CLIENT_ID_MASK) >> MEMORY_CLIENT_ID_SHIFT;
+ u32 vmid = (status & FAULT_VMID_MASK) >> FAULT_VMID_SHIFT;
+ u32 protections = (status & PROTECTIONS_MASK) >> PROTECTIONS_SHIFT;
+ char *block = (char *)&mc_client;
+
+ printk("VM fault (0x%02x, vmid %d) at page %u, %s from %s (%d)\n",
+ protections, vmid, addr,
+ (status & MEMORY_CLIENT_RW_MASK) ? "write" : "read",
+ block, mc_id);
+}
+
+/**
* cik_vm_flush - cik vm flush using the CP
*
* @rdev: radeon_device pointer
@@ -5496,6 +5519,7 @@ int cik_irq_process(struct radeon_device *rdev)
u32 ring_index;
bool queue_hotplug = false;
bool queue_reset = false;
+ u32 addr, status, mc_client;
if (!rdev->ih.enabled || rdev->shutdown)
return IRQ_NONE;
@@ -5731,11 +5755,15 @@ restart_ih:
break;
case 146:
case 147:
+ addr = RREG32(VM_CONTEXT1_PROTECTION_FAULT_ADDR);
+ status = RREG32(VM_CONTEXT1_PROTECTION_FAULT_STATUS);
+ mc_client =
RREG32(VM_CONTEXT1_PROTECTION_FAULT_MCCLIENT);
dev_err(rdev->dev, "GPU fault detected: %d 0x%08x\n",
src_id, src_data);
dev_err(rdev->dev, " VM_CONTEXT1_PROTECTION_FAULT_ADDR
0x%08X\n",
- RREG32(VM_CONTEXT1_PROTECTION_FAULT_ADDR));
+ addr);
dev_err(rdev->dev, "
VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x%08X\n",
- RREG32(VM_CONTEXT1_PROTECTION_FAULT_STATUS));
+ status);
+ cik_vm_decode_fault(rdev, status, addr, mc_client);
/* reset addr and status */
WREG32_P(VM_CONTEXT1_CNTL2, 1, ~1);
break;
diff --git a/drivers/gpu/drm/radeon/cikd.h b/drivers/gpu/drm/radeon/cikd.h
index 63514b9..7e9275e 100644
--- a/drivers/gpu/drm/radeon/cikd.h
+++ b/drivers/gpu/drm/radeon/cikd.h
@@ -136,6 +136,22 @@
#define VM_INVALIDATE_RESPONSE 0x147c
#define VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x14DC
+#define PROTECTIONS_MASK (0xf << 0)
+#define PROTECTIONS_SHIFT 0
+ /* bit 0: range
+ * bit 1: pde0
+ * bit 2: valid
+ * bit 3: read
+ * bit 4: write
+ */
+#define MEMORY_CLIENT_ID_MASK (0xff << 12)
+#define MEMORY_CLIENT_ID_SHIFT 12
+#define MEMORY_CLIENT_RW_MASK (1 << 24)
+#define MEMORY_CLIENT_RW_SHIFT 24
+#define FAULT_VMID_MASK (0xf << 25)
+#define FAULT_VMID_SHIFT 25
+
+#define VM_CONTEXT1_PROTECTION_FAULT_MCCLIENT 0x14E4
#define VM_CONTEXT1_PROTECTION_FAULT_ADDR 0x14FC
--
1.7.7.5
