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authorAnton Arapov <anton@redhat.com>2012-08-07 11:21:50 +0200
committerAnton Arapov <anton@redhat.com>2012-08-07 12:52:25 +0200
commit1d44b6f3fcf6058fb7c960b7558766967e8028f7 (patch)
tree53d88547c973ba048d233091a3f91f3173ad01df /arch/powerpc/kernel/vio.c
parentd91eda5d7b0383e6a0c83e0146ff141ff3b1355b (diff)
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fedora kernel: 222b075b3ff0d9e88aa9353e3c80667756ed7361v3.5.0-4
Signed-off-by: Anton Arapov <anton@redhat.com>
Diffstat (limited to 'arch/powerpc/kernel/vio.c')
-rw-r--r--arch/powerpc/kernel/vio.c273
1 files changed, 234 insertions, 39 deletions
diff --git a/arch/powerpc/kernel/vio.c b/arch/powerpc/kernel/vio.c
index a3a99901c8e..cb87301ccd5 100644
--- a/arch/powerpc/kernel/vio.c
+++ b/arch/powerpc/kernel/vio.c
@@ -14,7 +14,9 @@
* 2 of the License, or (at your option) any later version.
*/
+#include <linux/cpu.h>
#include <linux/types.h>
+#include <linux/delay.h>
#include <linux/stat.h>
#include <linux/device.h>
#include <linux/init.h>
@@ -709,13 +711,26 @@ static int vio_cmo_bus_probe(struct vio_dev *viodev)
struct vio_driver *viodrv = to_vio_driver(dev->driver);
unsigned long flags;
size_t size;
+ bool dma_capable = false;
+
+ /* A device requires entitlement if it has a DMA window property */
+ switch (viodev->family) {
+ case VDEVICE:
+ if (of_get_property(viodev->dev.of_node,
+ "ibm,my-dma-window", NULL))
+ dma_capable = true;
+ break;
+ case PFO:
+ dma_capable = false;
+ break;
+ default:
+ dev_warn(dev, "unknown device family: %d\n", viodev->family);
+ BUG();
+ break;
+ }
- /*
- * Check to see that device has a DMA window and configure
- * entitlement for the device.
- */
- if (of_get_property(viodev->dev.of_node,
- "ibm,my-dma-window", NULL)) {
+ /* Configure entitlement for the device. */
+ if (dma_capable) {
/* Check that the driver is CMO enabled and get desired DMA */
if (!viodrv->get_desired_dma) {
dev_err(dev, "%s: device driver does not support CMO\n",
@@ -1050,6 +1065,94 @@ static void vio_cmo_sysfs_init(void) { }
EXPORT_SYMBOL(vio_cmo_entitlement_update);
EXPORT_SYMBOL(vio_cmo_set_dev_desired);
+
+/*
+ * Platform Facilities Option (PFO) support
+ */
+
+/**
+ * vio_h_cop_sync - Perform a synchronous PFO co-processor operation
+ *
+ * @vdev - Pointer to a struct vio_dev for device
+ * @op - Pointer to a struct vio_pfo_op for the operation parameters
+ *
+ * Calls the hypervisor to synchronously perform the PFO operation
+ * described in @op. In the case of a busy response from the hypervisor,
+ * the operation will be re-submitted indefinitely unless a non-zero timeout
+ * is specified or an error occurs. The timeout places a limit on when to
+ * stop re-submitting a operation, the total time can be exceeded if an
+ * operation is in progress.
+ *
+ * If op->hcall_ret is not NULL, this will be set to the return from the
+ * last h_cop_op call or it will be 0 if an error not involving the h_call
+ * was encountered.
+ *
+ * Returns:
+ * 0 on success,
+ * -EINVAL if the h_call fails due to an invalid parameter,
+ * -E2BIG if the h_call can not be performed synchronously,
+ * -EBUSY if a timeout is specified and has elapsed,
+ * -EACCES if the memory area for data/status has been rescinded, or
+ * -EPERM if a hardware fault has been indicated
+ */
+int vio_h_cop_sync(struct vio_dev *vdev, struct vio_pfo_op *op)
+{
+ struct device *dev = &vdev->dev;
+ unsigned long deadline = 0;
+ long hret = 0;
+ int ret = 0;
+
+ if (op->timeout)
+ deadline = jiffies + msecs_to_jiffies(op->timeout);
+
+ while (true) {
+ hret = plpar_hcall_norets(H_COP, op->flags,
+ vdev->resource_id,
+ op->in, op->inlen, op->out,
+ op->outlen, op->csbcpb);
+
+ if (hret == H_SUCCESS ||
+ (hret != H_NOT_ENOUGH_RESOURCES &&
+ hret != H_BUSY && hret != H_RESOURCE) ||
+ (op->timeout && time_after(deadline, jiffies)))
+ break;
+
+ dev_dbg(dev, "%s: hcall ret(%ld), retrying.\n", __func__, hret);
+ }
+
+ switch (hret) {
+ case H_SUCCESS:
+ ret = 0;
+ break;
+ case H_OP_MODE:
+ case H_TOO_BIG:
+ ret = -E2BIG;
+ break;
+ case H_RESCINDED:
+ ret = -EACCES;
+ break;
+ case H_HARDWARE:
+ ret = -EPERM;
+ break;
+ case H_NOT_ENOUGH_RESOURCES:
+ case H_RESOURCE:
+ case H_BUSY:
+ ret = -EBUSY;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ if (ret)
+ dev_dbg(dev, "%s: Sync h_cop_op failure (ret:%d) (hret:%ld)\n",
+ __func__, ret, hret);
+
+ op->hcall_err = hret;
+ return ret;
+}
+EXPORT_SYMBOL(vio_h_cop_sync);
+
static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev)
{
const unsigned char *dma_window;
@@ -1211,35 +1314,87 @@ static void __devinit vio_dev_release(struct device *dev)
struct vio_dev *vio_register_device_node(struct device_node *of_node)
{
struct vio_dev *viodev;
+ struct device_node *parent_node;
const unsigned int *unit_address;
+ const unsigned int *pfo_resid = NULL;
+ enum vio_dev_family family;
+ const char *of_node_name = of_node->name ? of_node->name : "<unknown>";
- /* we need the 'device_type' property, in order to match with drivers */
- if (of_node->type == NULL) {
- printk(KERN_WARNING "%s: node %s missing 'device_type'\n",
- __func__,
- of_node->name ? of_node->name : "<unknown>");
+ /*
+ * Determine if this node is a under the /vdevice node or under the
+ * /ibm,platform-facilities node. This decides the device's family.
+ */
+ parent_node = of_get_parent(of_node);
+ if (parent_node) {
+ if (!strcmp(parent_node->full_name, "/ibm,platform-facilities"))
+ family = PFO;
+ else if (!strcmp(parent_node->full_name, "/vdevice"))
+ family = VDEVICE;
+ else {
+ pr_warn("%s: parent(%s) of %s not recognized.\n",
+ __func__,
+ parent_node->full_name,
+ of_node_name);
+ of_node_put(parent_node);
+ return NULL;
+ }
+ of_node_put(parent_node);
+ } else {
+ pr_warn("%s: could not determine the parent of node %s.\n",
+ __func__, of_node_name);
return NULL;
}
- unit_address = of_get_property(of_node, "reg", NULL);
- if (unit_address == NULL) {
- printk(KERN_WARNING "%s: node %s missing 'reg'\n",
- __func__,
- of_node->name ? of_node->name : "<unknown>");
- return NULL;
+ if (family == PFO) {
+ if (of_get_property(of_node, "interrupt-controller", NULL)) {
+ pr_debug("%s: Skipping the interrupt controller %s.\n",
+ __func__, of_node_name);
+ return NULL;
+ }
}
/* allocate a vio_dev for this node */
viodev = kzalloc(sizeof(struct vio_dev), GFP_KERNEL);
- if (viodev == NULL)
+ if (viodev == NULL) {
+ pr_warn("%s: allocation failure for VIO device.\n", __func__);
return NULL;
+ }
- viodev->irq = irq_of_parse_and_map(of_node, 0);
+ /* we need the 'device_type' property, in order to match with drivers */
+ viodev->family = family;
+ if (viodev->family == VDEVICE) {
+ if (of_node->type != NULL)
+ viodev->type = of_node->type;
+ else {
+ pr_warn("%s: node %s is missing the 'device_type' "
+ "property.\n", __func__, of_node_name);
+ goto out;
+ }
+
+ unit_address = of_get_property(of_node, "reg", NULL);
+ if (unit_address == NULL) {
+ pr_warn("%s: node %s missing 'reg'\n",
+ __func__, of_node_name);
+ goto out;
+ }
+ dev_set_name(&viodev->dev, "%x", *unit_address);
+ viodev->irq = irq_of_parse_and_map(of_node, 0);
+ viodev->unit_address = *unit_address;
+ } else {
+ /* PFO devices need their resource_id for submitting COP_OPs
+ * This is an optional field for devices, but is required when
+ * performing synchronous ops */
+ pfo_resid = of_get_property(of_node, "ibm,resource-id", NULL);
+ if (pfo_resid != NULL)
+ viodev->resource_id = *pfo_resid;
+
+ unit_address = NULL;
+ dev_set_name(&viodev->dev, "%s", of_node_name);
+ viodev->type = of_node_name;
+ viodev->irq = 0;
+ }
- dev_set_name(&viodev->dev, "%x", *unit_address);
viodev->name = of_node->name;
- viodev->type = of_node->type;
- viodev->unit_address = *unit_address;
viodev->dev.of_node = of_node_get(of_node);
if (firmware_has_feature(FW_FEATURE_CMO))
@@ -1267,16 +1422,51 @@ struct vio_dev *vio_register_device_node(struct device_node *of_node)
}
return viodev;
+
+out: /* Use this exit point for any return prior to device_register */
+ kfree(viodev);
+
+ return NULL;
}
EXPORT_SYMBOL(vio_register_device_node);
+/*
+ * vio_bus_scan_for_devices - Scan OF and register each child device
+ * @root_name - OF node name for the root of the subtree to search.
+ * This must be non-NULL
+ *
+ * Starting from the root node provide, register the device node for
+ * each child beneath the root.
+ */
+static void vio_bus_scan_register_devices(char *root_name)
+{
+ struct device_node *node_root, *node_child;
+
+ if (!root_name)
+ return;
+
+ node_root = of_find_node_by_name(NULL, root_name);
+ if (node_root) {
+
+ /*
+ * Create struct vio_devices for each virtual device in
+ * the device tree. Drivers will associate with them later.
+ */
+ node_child = of_get_next_child(node_root, NULL);
+ while (node_child) {
+ vio_register_device_node(node_child);
+ node_child = of_get_next_child(node_root, node_child);
+ }
+ of_node_put(node_root);
+ }
+}
+
/**
* vio_bus_init: - Initialize the virtual IO bus
*/
static int __init vio_bus_init(void)
{
int err;
- struct device_node *node_vroot;
if (firmware_has_feature(FW_FEATURE_CMO))
vio_cmo_sysfs_init();
@@ -1301,19 +1491,8 @@ static int __init vio_bus_init(void)
if (firmware_has_feature(FW_FEATURE_CMO))
vio_cmo_bus_init();
- node_vroot = of_find_node_by_name(NULL, "vdevice");
- if (node_vroot) {
- struct device_node *of_node;
-
- /*
- * Create struct vio_devices for each virtual device in
- * the device tree. Drivers will associate with them later.
- */
- for (of_node = node_vroot->child; of_node != NULL;
- of_node = of_node->sibling)
- vio_register_device_node(of_node);
- of_node_put(node_vroot);
- }
+ vio_bus_scan_register_devices("vdevice");
+ vio_bus_scan_register_devices("ibm,platform-facilities");
return 0;
}
@@ -1436,12 +1615,28 @@ struct vio_dev *vio_find_node(struct device_node *vnode)
{
const uint32_t *unit_address;
char kobj_name[20];
+ struct device_node *vnode_parent;
+ const char *dev_type;
+
+ vnode_parent = of_get_parent(vnode);
+ if (!vnode_parent)
+ return NULL;
+
+ dev_type = of_get_property(vnode_parent, "device_type", NULL);
+ of_node_put(vnode_parent);
+ if (!dev_type)
+ return NULL;
/* construct the kobject name from the device node */
- unit_address = of_get_property(vnode, "reg", NULL);
- if (!unit_address)
+ if (!strcmp(dev_type, "vdevice")) {
+ unit_address = of_get_property(vnode, "reg", NULL);
+ if (!unit_address)
+ return NULL;
+ snprintf(kobj_name, sizeof(kobj_name), "%x", *unit_address);
+ } else if (!strcmp(dev_type, "ibm,platform-facilities"))
+ snprintf(kobj_name, sizeof(kobj_name), "%s", vnode->name);
+ else
return NULL;
- snprintf(kobj_name, sizeof(kobj_name), "%x", *unit_address);
return vio_find_name(kobj_name);
}