iommu/amd: Add routines to bind/unbind a pasid

This patch adds routines to bind a specific process
address-space to a given PASID.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

diff --git a/drivers/iommu/amd_iommu_v2.c b/drivers/iommu/amd_iommu_v2.c
index bfceed2..b5ee09e 100644 (file)
--- a/drivers/iommu/amd_iommu_v2.c
+++ b/drivers/iommu/amd_iommu_v2.c
@@ -19,6 +19,7 @@
 #include <linux/amd-iommu.h>
 #include <linux/mm_types.h>
 #include <linux/module.h>
+#include <linux/sched.h>
 #include <linux/iommu.h>
 #include <linux/pci.h>
 #include <linux/gfp.h>
@@ -61,6 +62,10 @@ static spinlock_t state_lock;
 
 /* List and lock for all pasid_states */
 static LIST_HEAD(pasid_state_list);
+static DEFINE_SPINLOCK(ps_lock);
+
+static void free_pasid_states(struct device_state *dev_state);
+static void unbind_pasid(struct device_state *dev_state, int pasid);
 
 static u16 device_id(struct pci_dev *pdev)
 {
@@ -88,8 +93,16 @@ static struct device_state *get_device_state(u16 devid)
 
 static void free_device_state(struct device_state *dev_state)
 {
+       /*
+        * First detach device from domain - No more PRI requests will arrive
+        * from that device after it is unbound from the IOMMUv2 domain.
+        */
        iommu_detach_device(dev_state->domain, &dev_state->pdev->dev);
+
+       /* Everything is down now, free the IOMMUv2 domain */
        iommu_domain_free(dev_state->domain);
+
+       /* Finally get rid of the device-state */
        kfree(dev_state);
 }
 
@@ -99,6 +112,296 @@ static void put_device_state(struct device_state *dev_state)
                free_device_state(dev_state);
 }
 
+static void link_pasid_state(struct pasid_state *pasid_state)
+{
+       spin_lock(&ps_lock);
+       list_add_tail(&pasid_state->list, &pasid_state_list);
+       spin_unlock(&ps_lock);
+}
+
+static void __unlink_pasid_state(struct pasid_state *pasid_state)
+{
+       list_del(&pasid_state->list);
+}
+
+static void unlink_pasid_state(struct pasid_state *pasid_state)
+{
+       spin_lock(&ps_lock);
+       __unlink_pasid_state(pasid_state);
+       spin_unlock(&ps_lock);
+}
+
+/* Must be called under dev_state->lock */
+static struct pasid_state **__get_pasid_state_ptr(struct device_state *dev_state,
+                                                 int pasid, bool alloc)
+{
+       struct pasid_state **root, **ptr;
+       int level, index;
+
+       level = dev_state->pasid_levels;
+       root  = dev_state->states;
+
+       while (true) {
+
+               index = (pasid >> (9 * level)) & 0x1ff;
+               ptr   = &root[index];
+
+               if (level == 0)
+                       break;
+
+               if (*ptr == NULL) {
+                       if (!alloc)
+                               return NULL;
+
+                       *ptr = (void *)get_zeroed_page(GFP_ATOMIC);
+                       if (*ptr == NULL)
+                               return NULL;
+               }
+
+               root   = (struct pasid_state **)*ptr;
+               level -= 1;
+       }
+
+       return ptr;
+}
+
+static int set_pasid_state(struct device_state *dev_state,
+                          struct pasid_state *pasid_state,
+                          int pasid)
+{
+       struct pasid_state **ptr;
+       unsigned long flags;
+       int ret;
+
+       spin_lock_irqsave(&dev_state->lock, flags);
+       ptr = __get_pasid_state_ptr(dev_state, pasid, true);
+
+       ret = -ENOMEM;
+       if (ptr == NULL)
+               goto out_unlock;
+
+       ret = -ENOMEM;
+       if (*ptr != NULL)
+               goto out_unlock;
+
+       *ptr = pasid_state;
+
+       ret = 0;
+
+out_unlock:
+       spin_unlock_irqrestore(&dev_state->lock, flags);
+
+       return ret;
+}
+
+static void clear_pasid_state(struct device_state *dev_state, int pasid)
+{
+       struct pasid_state **ptr;
+       unsigned long flags;
+
+       spin_lock_irqsave(&dev_state->lock, flags);
+       ptr = __get_pasid_state_ptr(dev_state, pasid, true);
+
+       if (ptr == NULL)
+               goto out_unlock;
+
+       *ptr = NULL;
+
+out_unlock:
+       spin_unlock_irqrestore(&dev_state->lock, flags);
+}
+
+static struct pasid_state *get_pasid_state(struct device_state *dev_state,
+                                          int pasid)
+{
+       struct pasid_state **ptr, *ret = NULL;
+       unsigned long flags;
+
+       spin_lock_irqsave(&dev_state->lock, flags);
+       ptr = __get_pasid_state_ptr(dev_state, pasid, false);
+
+       if (ptr == NULL)
+               goto out_unlock;
+
+       ret = *ptr;
+       if (ret)
+               atomic_inc(&ret->count);
+
+out_unlock:
+       spin_unlock_irqrestore(&dev_state->lock, flags);
+
+       return ret;
+}
+
+static void free_pasid_state(struct pasid_state *pasid_state)
+{
+       kfree(pasid_state);
+}
+
+static void put_pasid_state(struct pasid_state *pasid_state)
+{
+       if (atomic_dec_and_test(&pasid_state->count)) {
+               put_device_state(pasid_state->device_state);
+               mmput(pasid_state->mm);
+               free_pasid_state(pasid_state);
+       }
+}
+
+static void unbind_pasid(struct device_state *dev_state, int pasid)
+{
+       struct pasid_state *pasid_state;
+
+       pasid_state = get_pasid_state(dev_state, pasid);
+       if (pasid_state == NULL)
+               return;
+
+       unlink_pasid_state(pasid_state);
+
+       amd_iommu_domain_clear_gcr3(dev_state->domain, pasid);
+       clear_pasid_state(dev_state, pasid);
+
+       put_pasid_state(pasid_state); /* Reference taken in this function */
+       put_pasid_state(pasid_state); /* Reference taken in bind() function */
+}
+
+static void free_pasid_states_level1(struct pasid_state **tbl)
+{
+       int i;
+
+       for (i = 0; i < 512; ++i) {
+               if (tbl[i] == NULL)
+                       continue;
+
+               free_page((unsigned long)tbl[i]);
+       }
+}
+
+static void free_pasid_states_level2(struct pasid_state **tbl)
+{
+       struct pasid_state **ptr;
+       int i;
+
+       for (i = 0; i < 512; ++i) {
+               if (tbl[i] == NULL)
+                       continue;
+
+               ptr = (struct pasid_state **)tbl[i];
+               free_pasid_states_level1(ptr);
+       }
+}
+
+static void free_pasid_states(struct device_state *dev_state)
+{
+       struct pasid_state *pasid_state;
+       int i;
+
+       for (i = 0; i < dev_state->max_pasids; ++i) {
+               pasid_state = get_pasid_state(dev_state, i);
+               if (pasid_state == NULL)
+                       continue;
+
+               unbind_pasid(dev_state, i);
+               put_pasid_state(pasid_state);
+       }
+
+       if (dev_state->pasid_levels == 2)
+               free_pasid_states_level2(dev_state->states);
+       else if (dev_state->pasid_levels == 1)
+               free_pasid_states_level1(dev_state->states);
+       else if (dev_state->pasid_levels != 0)
+               BUG();
+
+       free_page((unsigned long)dev_state->states);
+}
+
+int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
+                        struct task_struct *task)
+{
+       struct pasid_state *pasid_state;
+       struct device_state *dev_state;
+       u16 devid;
+       int ret;
+
+       might_sleep();
+
+       if (!amd_iommu_v2_supported())
+               return -ENODEV;
+
+       devid     = device_id(pdev);
+       dev_state = get_device_state(devid);
+
+       if (dev_state == NULL)
+               return -EINVAL;
+
+       ret = -EINVAL;
+       if (pasid < 0 || pasid >= dev_state->max_pasids)
+               goto out;
+
+       ret = -ENOMEM;
+       pasid_state = kzalloc(sizeof(*pasid_state), GFP_KERNEL);
+       if (pasid_state == NULL)
+               goto out;
+
+       atomic_set(&pasid_state->count, 1);
+       pasid_state->task         = task;
+       pasid_state->mm           = get_task_mm(task);
+       pasid_state->device_state = dev_state;
+       pasid_state->pasid        = pasid;
+
+       if (pasid_state->mm == NULL)
+               goto out_free;
+
+       ret = set_pasid_state(dev_state, pasid_state, pasid);
+       if (ret)
+               goto out_free;
+
+       ret = amd_iommu_domain_set_gcr3(dev_state->domain, pasid,
+                                       __pa(pasid_state->mm->pgd));
+       if (ret)
+               goto out_clear_state;
+
+       link_pasid_state(pasid_state);
+
+       return 0;
+
+out_clear_state:
+       clear_pasid_state(dev_state, pasid);
+
+out_free:
+       put_pasid_state(pasid_state);
+
+out:
+       put_device_state(dev_state);
+
+       return ret;
+}
+EXPORT_SYMBOL(amd_iommu_bind_pasid);
+
+void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid)
+{
+       struct device_state *dev_state;
+       u16 devid;
+
+       might_sleep();
+
+       if (!amd_iommu_v2_supported())
+               return;
+
+       devid = device_id(pdev);
+       dev_state = get_device_state(devid);
+       if (dev_state == NULL)
+               return;
+
+       if (pasid < 0 || pasid >= dev_state->max_pasids)
+               goto out;
+
+       unbind_pasid(dev_state, pasid);
+
+out:
+       put_device_state(dev_state);
+}
+EXPORT_SYMBOL(amd_iommu_unbind_pasid);
+
 int amd_iommu_init_device(struct pci_dev *pdev, int pasids)
 {
        struct device_state *dev_state;
@@ -199,6 +502,9 @@ void amd_iommu_free_device(struct pci_dev *pdev)
 
        spin_unlock_irqrestore(&state_lock, flags);
 
+       /* Get rid of any remaining pasid states */
+       free_pasid_states(dev_state);
+
        put_device_state(dev_state);
 }
 EXPORT_SYMBOL(amd_iommu_free_device);

diff --git a/include/linux/amd-iommu.h b/include/linux/amd-iommu.h
index e8c7a2e..23e21e1 100644 (file)
--- a/include/linux/amd-iommu.h
+++ b/include/linux/amd-iommu.h
@@ -24,9 +24,13 @@
 
 #ifdef CONFIG_AMD_IOMMU
 
+struct task_struct;
 struct pci_dev;
 
 extern int amd_iommu_detect(void);
+extern int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
+                               struct task_struct *task);
+extern void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid);
 
 
 /**
@@ -65,6 +69,28 @@ extern int amd_iommu_init_device(struct pci_dev *pdev, int pasids);
  */
 extern void amd_iommu_free_device(struct pci_dev *pdev);
 
+/**
+ * amd_iommu_bind_pasid() - Bind a given task to a PASID on a device
+ * @pdev: The PCI device to bind the task to
+ * @pasid: The PASID on the device the task should be bound to
+ * @task: the task to bind
+ *
+ * The function returns 0 on success or a negative value on error.
+ */
+extern int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
+                               struct task_struct *task);
+
+/**
+ * amd_iommu_unbind_pasid() - Unbind a PASID from its task on
+ *                           a device
+ * @pdev: The device of the PASID
+ * @pasid: The PASID to unbind
+ *
+ * When this function returns the device is no longer using the PASID
+ * and the PASID is no longer bound to its task.
+ */
+extern void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid);
+
 #else
 
 static inline int amd_iommu_detect(void) { return -ENODEV; }