cxl: Rework the implementation of cxl_stop_trace_psl9()

Presently the PSL9 specific cxl_stop_trace_psl9() only stops the RX0
traces on the CXL adapter when a PSL error irq is triggered. The patch
updates the function to stop all the traces arrays and move them to
the FIN state. The implementation issues the mmio to TRACECFG register
to stop the trace array iff it already not in FIN state. This prevents
the issue of trace data being reset in case of multiple stop mmio
issued for a single trace array.

Also the patch does some refactoring of existing cxl_stop_trace_psl9()
and cxl_stop_trace_psl8() functions by moving them to 'pci.c' from
'debugfs.c' file and marking them as static.
Signed-off-by: Vaibhav Jain <vaibhav@linux.vnet.ibm.com>
Acked-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

drivers/misc/cxl/cxl.h

@@ -115,6 +115,7 @@ static const cxl_p1_reg_t CXL_PSL9_TRACECFG = {0x0368};
 static const cxl_p1_reg_t CXL_PSL9_APCDEDALLOC = {0x0378};
 static const cxl_p1_reg_t CXL_PSL9_APCDEDTYPE = {0x0380};
 static const cxl_p1_reg_t CXL_PSL9_TNR_ADDR = {0x0388};
+static const cxl_p1_reg_t CXL_PSL9_CTCCFG = {0x0390};
 static const cxl_p1_reg_t CXL_PSL9_GP_CT = {0x0398};
 static const cxl_p1_reg_t CXL_XSL9_IERAT = {0x0588};
 static const cxl_p1_reg_t CXL_XSL9_ILPP  = {0x0590};
@@ -417,6 +418,9 @@ static const cxl_p2n_reg_t CXL_PSL_WED_An     = {0x0A0};
 #define CXL_CARD_MINOR(adapter) (adapter->adapter_num * CXL_DEV_MINORS)
 #define CXL_DEVT_ADAPTER(dev) (MINOR(dev) / CXL_DEV_MINORS)
 
+#define CXL_PSL9_TRACEID_MAX 0xAU
+#define CXL_PSL9_TRACESTATE_FIN 0x3U
+
 enum cxl_context_status {
 	CLOSED,
 	OPENED,
@@ -941,8 +945,6 @@ int cxl_debugfs_adapter_add(struct cxl *adapter);
 void cxl_debugfs_adapter_remove(struct cxl *adapter);
 int cxl_debugfs_afu_add(struct cxl_afu *afu);
 void cxl_debugfs_afu_remove(struct cxl_afu *afu);
-void cxl_stop_trace_psl9(struct cxl *cxl);
-void cxl_stop_trace_psl8(struct cxl *cxl);
 void cxl_debugfs_add_adapter_regs_psl9(struct cxl *adapter, struct dentry *dir);
 void cxl_debugfs_add_adapter_regs_psl8(struct cxl *adapter, struct dentry *dir);
 void cxl_debugfs_add_adapter_regs_xsl(struct cxl *adapter, struct dentry *dir);
@@ -978,14 +980,6 @@ static inline void cxl_debugfs_afu_remove(struct cxl_afu *afu)
 {
 }
 
-static inline void cxl_stop_trace_psl9(struct cxl *cxl)
-{
-}
-
-static inline void cxl_stop_trace_psl8(struct cxl *cxl)
-{
-}
-
 static inline void cxl_debugfs_add_adapter_regs_psl9(struct cxl *adapter,
 						    struct dentry *dir)
 {

drivers/misc/cxl/debugfs.c

@@ -15,28 +15,6 @@
 
 static struct dentry *cxl_debugfs;
 
-void cxl_stop_trace_psl9(struct cxl *adapter)
-{
-	/* Stop the trace */
-	cxl_p1_write(adapter, CXL_PSL9_TRACECFG, 0x4480000000000000ULL);
-}
-
-void cxl_stop_trace_psl8(struct cxl *adapter)
-{
-	int slice;
-
-	/* Stop the trace */
-	cxl_p1_write(adapter, CXL_PSL_TRACE, 0x8000000000000017LL);
-
-	/* Stop the slice traces */
-	spin_lock(&adapter->afu_list_lock);
-	for (slice = 0; slice < adapter->slices; slice++) {
-		if (adapter->afu[slice])
-			cxl_p1n_write(adapter->afu[slice], CXL_PSL_SLICE_TRACE, 0x8000000000000000LL);
-	}
-	spin_unlock(&adapter->afu_list_lock);
-}
-
 /* Helpers to export CXL mmaped IO registers via debugfs */
 static int debugfs_io_u64_get(void *data, u64 *val)
 {

drivers/misc/cxl/pci.c

@@ -1747,6 +1747,44 @@ static void cxl_deconfigure_adapter(struct cxl *adapter)
 	pci_disable_device(pdev);
 }
 
+static void cxl_stop_trace_psl9(struct cxl *adapter)
+{
+	int traceid;
+	u64 trace_state, trace_mask;
+	struct pci_dev *dev = to_pci_dev(adapter->dev.parent);
+
+	/* read each tracearray state and issue mmio to stop them is needed */
+	for (traceid = 0; traceid <= CXL_PSL9_TRACEID_MAX; ++traceid) {
+		trace_state = cxl_p1_read(adapter, CXL_PSL9_CTCCFG);
+		trace_mask = (0x3ULL << (62 - traceid * 2));
+		trace_state = (trace_state & trace_mask) >> (62 - traceid * 2);
+		dev_dbg(&dev->dev, "cxl: Traceid-%d trace_state=0x%0llX\n",
+			traceid, trace_state);
+
+		/* issue mmio if the trace array isn't in FIN state */
+		if (trace_state != CXL_PSL9_TRACESTATE_FIN)
+			cxl_p1_write(adapter, CXL_PSL9_TRACECFG,
+				     0x8400000000000000ULL | traceid);
+	}
+}
+
+static void cxl_stop_trace_psl8(struct cxl *adapter)
+{
+	int slice;
+
+	/* Stop the trace */
+	cxl_p1_write(adapter, CXL_PSL_TRACE, 0x8000000000000017LL);
+
+	/* Stop the slice traces */
+	spin_lock(&adapter->afu_list_lock);
+	for (slice = 0; slice < adapter->slices; slice++) {
+		if (adapter->afu[slice])
+			cxl_p1n_write(adapter->afu[slice], CXL_PSL_SLICE_TRACE,
+				      0x8000000000000000LL);
+	}
+	spin_unlock(&adapter->afu_list_lock);
+}
+
 static const struct cxl_service_layer_ops psl9_ops = {
 	.adapter_regs_init = init_implementation_adapter_regs_psl9,
 	.invalidate_all = cxl_invalidate_all_psl9,