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Diffstat (limited to 'arch/powerpc/platforms/powernv/vas.c')
-rw-r--r--arch/powerpc/platforms/powernv/vas.c85
1 files changed, 79 insertions, 6 deletions
diff --git a/arch/powerpc/platforms/powernv/vas.c b/arch/powerpc/platforms/powernv/vas.c
index ed9cc6df329a..598e4cd563fb 100644
--- a/arch/powerpc/platforms/powernv/vas.c
+++ b/arch/powerpc/platforms/powernv/vas.c
@@ -14,7 +14,10 @@
#include <linux/of_platform.h>
#include <linux/of_address.h>
#include <linux/of.h>
+#include <linux/irqdomain.h>
+#include <linux/interrupt.h>
#include <asm/prom.h>
+#include <asm/xive.h>
#include "vas.h"
@@ -23,12 +26,37 @@ static LIST_HEAD(vas_instances);
static DEFINE_PER_CPU(int, cpu_vas_id);
+static int vas_irq_fault_window_setup(struct vas_instance *vinst)
+{
+ char devname[64];
+ int rc = 0;
+
+ snprintf(devname, sizeof(devname), "vas-%d", vinst->vas_id);
+ rc = request_threaded_irq(vinst->virq, vas_fault_handler,
+ vas_fault_thread_fn, 0, devname, vinst);
+
+ if (rc) {
+ pr_err("VAS[%d]: Request IRQ(%d) failed with %d\n",
+ vinst->vas_id, vinst->virq, rc);
+ goto out;
+ }
+
+ rc = vas_setup_fault_window(vinst);
+ if (rc)
+ free_irq(vinst->virq, vinst);
+
+out:
+ return rc;
+}
+
static int init_vas_instance(struct platform_device *pdev)
{
- int rc, cpu, vasid;
- struct resource *res;
- struct vas_instance *vinst;
struct device_node *dn = pdev->dev.of_node;
+ struct vas_instance *vinst;
+ struct xive_irq_data *xd;
+ uint32_t chipid, hwirq;
+ struct resource *res;
+ int rc, cpu, vasid;
rc = of_property_read_u32(dn, "ibm,vas-id", &vasid);
if (rc) {
@@ -36,6 +64,12 @@ static int init_vas_instance(struct platform_device *pdev)
return -ENODEV;
}
+ rc = of_property_read_u32(dn, "ibm,chip-id", &chipid);
+ if (rc) {
+ pr_err("No ibm,chip-id property for %s?\n", pdev->name);
+ return -ENODEV;
+ }
+
if (pdev->num_resources != 4) {
pr_err("Unexpected DT configuration for [%s, %d]\n",
pdev->name, vasid);
@@ -69,9 +103,32 @@ static int init_vas_instance(struct platform_device *pdev)
vinst->paste_win_id_shift = 63 - res->end;
- pr_devel("Initialized instance [%s, %d], paste_base 0x%llx, "
- "paste_win_id_shift 0x%llx\n", pdev->name, vasid,
- vinst->paste_base_addr, vinst->paste_win_id_shift);
+ hwirq = xive_native_alloc_irq_on_chip(chipid);
+ if (!hwirq) {
+ pr_err("Inst%d: Unable to allocate global irq for chip %d\n",
+ vinst->vas_id, chipid);
+ return -ENOENT;
+ }
+
+ vinst->virq = irq_create_mapping(NULL, hwirq);
+ if (!vinst->virq) {
+ pr_err("Inst%d: Unable to map global irq %d\n",
+ vinst->vas_id, hwirq);
+ return -EINVAL;
+ }
+
+ xd = irq_get_handler_data(vinst->virq);
+ if (!xd) {
+ pr_err("Inst%d: Invalid virq %d\n",
+ vinst->vas_id, vinst->virq);
+ return -EINVAL;
+ }
+
+ vinst->irq_port = xd->trig_page;
+ pr_devel("Initialized instance [%s, %d] paste_base 0x%llx paste_win_id_shift 0x%llx IRQ %d Port 0x%llx\n",
+ pdev->name, vasid, vinst->paste_base_addr,
+ vinst->paste_win_id_shift, vinst->virq,
+ vinst->irq_port);
for_each_possible_cpu(cpu) {
if (cpu_to_chip_id(cpu) == of_get_ibm_chip_id(dn))
@@ -82,6 +139,22 @@ static int init_vas_instance(struct platform_device *pdev)
list_add(&vinst->node, &vas_instances);
mutex_unlock(&vas_mutex);
+ spin_lock_init(&vinst->fault_lock);
+ /*
+ * IRQ and fault handling setup is needed only for user space
+ * send windows.
+ */
+ if (vinst->virq) {
+ rc = vas_irq_fault_window_setup(vinst);
+ /*
+ * Fault window is used only for user space send windows.
+ * So if vinst->virq is NULL, tx_win_open returns -ENODEV
+ * for user space.
+ */
+ if (rc)
+ vinst->virq = 0;
+ }
+
vas_instance_init_dbgdir(vinst);
dev_set_drvdata(&pdev->dev, vinst);