[PATCH v2 0/4] powerpc/xive: add support for H_INT_RESET

@@ -19,6 +19,7 @@
 #include <linux/spinlock.h>
 #include <linux/cpumask.h>
 #include <linux/mm.h>
+#include <linux/delay.h>
 
 #include <asm/prom.h>
 #include <asm/io.h>

@@ -108,6 +109,51 @@ static void xive_irq_bitmap_free(int irq)
 	}
 }
 
+
+/* Based on the similar routines in RTAS */
+static unsigned int plpar_busy_delay_time(long rc)
+{
+	unsigned int ms = 0;
+
+	if (H_IS_LONG_BUSY(rc)) {
+		ms = get_longbusy_msecs(rc);
+	} else if (rc == H_BUSY) {
+		ms = 10; /* seems appropriate for XIVE hcalls */
+	}
+
+	return ms;
+}
+
+static unsigned int plpar_busy_delay(int rc)
+{
+	unsigned int ms;
+
+	ms = plpar_busy_delay_time(rc);
+	if (ms)
+		mdelay(ms);
+
+	return ms;
+}
+
+/*
+ * Note: this call has a partition wide scope and can take a while to
+ * complete. If it returns H_LONG_BUSY_* it should be retried
+ * periodically.
+ */
+static long plpar_int_reset(unsigned long flags)
+{
+	long rc;
+
+	do {
+		rc = plpar_hcall_norets(H_INT_RESET, flags);
+	} while (plpar_busy_delay(rc));
+
+	if (rc)
+		pr_err("H_INT_RESET failed %ld\n", rc);
+
+	return rc;
+}
+
 static long plpar_int_get_source_info(unsigned long flags,
 				      unsigned long lisn,
 				      unsigned long *src_flags,

@@ -433,11 +479,7 @@ static void xive_spapr_put_ipi(unsigned int cpu, struct xive_cpu *xc)
 
 static void xive_spapr_shutdown(void)
 {
-	long rc;
-
-	rc = plpar_hcall_norets(H_INT_RESET, 0);
-	if (rc)
-		pr_err("H_INT_RESET failed %ld\n", rc);
+	plpar_int_reset(0);
 }
 
 /*

@@ -164,7 +164,10 @@ static long plpar_int_get_source_info(unsigned long flags,
 	unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 	long rc;
 
-	rc = plpar_hcall(H_INT_GET_SOURCE_INFO, retbuf, flags, lisn);
+	do {
+		rc = plpar_hcall(H_INT_GET_SOURCE_INFO, retbuf, flags, lisn);
+	} while (plpar_busy_delay(rc));
+
 	if (rc) {
 		pr_err("H_INT_GET_SOURCE_INFO lisn=%ld failed %ld\n", lisn, rc);
 		return rc;

@@ -194,8 +197,11 @@ static long plpar_int_set_source_config(unsigned long flags,
 		flags, lisn, target, prio, sw_irq);
 
 
-	rc = plpar_hcall_norets(H_INT_SET_SOURCE_CONFIG, flags, lisn,
-				target, prio, sw_irq);
+	do {
+		rc = plpar_hcall_norets(H_INT_SET_SOURCE_CONFIG, flags, lisn,
+					target, prio, sw_irq);
+	} while (plpar_busy_delay(rc));
+
 	if (rc) {
 		pr_err("H_INT_SET_SOURCE_CONFIG lisn=%ld target=%lx prio=%lx failed %ld\n",
 		       lisn, target, prio, rc);

@@ -214,7 +220,11 @@ static long plpar_int_get_queue_info(unsigned long flags,
 	unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 	long rc;
 
-	rc = plpar_hcall(H_INT_GET_QUEUE_INFO, retbuf, flags, target, priority);
+	do {
+		rc = plpar_hcall(H_INT_GET_QUEUE_INFO, retbuf, flags, target,
+				 priority);
+	} while (plpar_busy_delay(rc));
+
 	if (rc) {
 		pr_err("H_INT_GET_QUEUE_INFO cpu=%ld prio=%ld failed %ld\n",
 		       target, priority, rc);

@@ -241,8 +251,11 @@ static long plpar_int_set_queue_config(unsigned long flags,
 	pr_devel("H_INT_SET_QUEUE_CONFIG flags=%lx target=%lx priority=%lx qpage=%lx qsize=%lx\n",
 		flags,  target, priority, qpage, qsize);
 
-	rc = plpar_hcall_norets(H_INT_SET_QUEUE_CONFIG, flags, target,
-				priority, qpage, qsize);
+	do {
+		rc = plpar_hcall_norets(H_INT_SET_QUEUE_CONFIG, flags, target,
+					priority, qpage, qsize);
+	} while (plpar_busy_delay(rc));
+
 	if (rc) {
 		pr_err("H_INT_SET_QUEUE_CONFIG cpu=%ld prio=%ld qpage=%lx returned %ld\n",
 		       target, priority, qpage, rc);

@@ -256,7 +269,10 @@ static long plpar_int_sync(unsigned long flags, unsigned long lisn)
 {
 	long rc;
 
-	rc = plpar_hcall_norets(H_INT_SYNC, flags, lisn);
+	do {
+		rc = plpar_hcall_norets(H_INT_SYNC, flags, lisn);
+	} while (plpar_busy_delay(rc));
+
 	if (rc) {
 		pr_err("H_INT_SYNC lisn=%ld returned %ld\n", lisn, rc);
 		return  rc;

@@ -277,7 +293,11 @@ static long plpar_int_esb(unsigned long flags,
 	pr_devel("H_INT_ESB flags=%lx lisn=%lx offset=%lx in=%lx\n",
 		flags,  lisn, offset, in_data);
 
-	rc = plpar_hcall(H_INT_ESB, retbuf, flags, lisn, offset, in_data);
+	do {
+		rc = plpar_hcall(H_INT_ESB, retbuf, flags, lisn, offset,
+				 in_data);
+	} while (plpar_busy_delay(rc));
+
 	if (rc) {
 		pr_err("H_INT_ESB lisn=%ld offset=%ld returned %ld\n",
 		       lisn, offset, rc);

@@ -57,8 +57,11 @@ void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
 		}
 	}
 
-	if (xive_enabled())
+	if (xive_enabled()) {
 		xive_kexec_teardown_cpu(secondary);
-	else
+
+		if (!secondary)
+			xive_shutdown();
+	} else
 		xics_kexec_teardown_cpu(secondary);
 }

@@ -231,16 +231,16 @@ static void kexec_prepare_cpus(void)
 	/* we are sure every CPU has IRQs off at this point */
 	kexec_all_irq_disabled = 1;
 
-	/* after we tell the others to go down */
-	if (ppc_md.kexec_cpu_down)
-		ppc_md.kexec_cpu_down(0, 0);
-
 	/*
 	 * Before removing MMU mappings make sure all CPUs have entered real
 	 * mode:
 	 */
 	kexec_prepare_cpus_wait(KEXEC_STATE_REAL_MODE);
 
+	/* after we tell the others to go down */
+	if (ppc_md.kexec_cpu_down)
+		ppc_md.kexec_cpu_down(0, 0);
+
 	put_cpu();
 }