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>
This commit is contained in:
Joerg Roedel
parent
ed96f228ba
commit
2d5503b624
2 changed files with 332 additions and 0 deletions
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@ -19,6 +19,7 @@
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#include <linux/amd-iommu.h>
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#include <linux/mm_types.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/iommu.h>
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#include <linux/pci.h>
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#include <linux/gfp.h>
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@ -61,6 +62,10 @@ static spinlock_t state_lock;
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/* List and lock for all pasid_states */
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static LIST_HEAD(pasid_state_list);
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static DEFINE_SPINLOCK(ps_lock);
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static void free_pasid_states(struct device_state *dev_state);
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static void unbind_pasid(struct device_state *dev_state, int pasid);
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static u16 device_id(struct pci_dev *pdev)
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{
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@ -88,8 +93,16 @@ static struct device_state *get_device_state(u16 devid)
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static void free_device_state(struct device_state *dev_state)
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{
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/*
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* First detach device from domain - No more PRI requests will arrive
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* from that device after it is unbound from the IOMMUv2 domain.
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*/
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iommu_detach_device(dev_state->domain, &dev_state->pdev->dev);
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/* Everything is down now, free the IOMMUv2 domain */
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iommu_domain_free(dev_state->domain);
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/* Finally get rid of the device-state */
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kfree(dev_state);
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}
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@ -99,6 +112,296 @@ static void put_device_state(struct device_state *dev_state)
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free_device_state(dev_state);
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}
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static void link_pasid_state(struct pasid_state *pasid_state)
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{
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spin_lock(&ps_lock);
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list_add_tail(&pasid_state->list, &pasid_state_list);
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spin_unlock(&ps_lock);
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}
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static void __unlink_pasid_state(struct pasid_state *pasid_state)
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{
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list_del(&pasid_state->list);
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}
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static void unlink_pasid_state(struct pasid_state *pasid_state)
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{
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spin_lock(&ps_lock);
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__unlink_pasid_state(pasid_state);
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spin_unlock(&ps_lock);
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}
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/* Must be called under dev_state->lock */
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static struct pasid_state **__get_pasid_state_ptr(struct device_state *dev_state,
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int pasid, bool alloc)
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{
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struct pasid_state **root, **ptr;
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int level, index;
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level = dev_state->pasid_levels;
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root = dev_state->states;
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while (true) {
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index = (pasid >> (9 * level)) & 0x1ff;
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ptr = &root[index];
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if (level == 0)
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break;
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if (*ptr == NULL) {
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if (!alloc)
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return NULL;
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*ptr = (void *)get_zeroed_page(GFP_ATOMIC);
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if (*ptr == NULL)
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return NULL;
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}
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root = (struct pasid_state **)*ptr;
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level -= 1;
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}
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return ptr;
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}
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static int set_pasid_state(struct device_state *dev_state,
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struct pasid_state *pasid_state,
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int pasid)
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{
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struct pasid_state **ptr;
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unsigned long flags;
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int ret;
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spin_lock_irqsave(&dev_state->lock, flags);
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ptr = __get_pasid_state_ptr(dev_state, pasid, true);
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ret = -ENOMEM;
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if (ptr == NULL)
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goto out_unlock;
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ret = -ENOMEM;
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if (*ptr != NULL)
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goto out_unlock;
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*ptr = pasid_state;
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ret = 0;
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out_unlock:
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spin_unlock_irqrestore(&dev_state->lock, flags);
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return ret;
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}
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static void clear_pasid_state(struct device_state *dev_state, int pasid)
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{
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struct pasid_state **ptr;
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unsigned long flags;
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spin_lock_irqsave(&dev_state->lock, flags);
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ptr = __get_pasid_state_ptr(dev_state, pasid, true);
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if (ptr == NULL)
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goto out_unlock;
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*ptr = NULL;
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out_unlock:
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spin_unlock_irqrestore(&dev_state->lock, flags);
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}
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static struct pasid_state *get_pasid_state(struct device_state *dev_state,
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int pasid)
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{
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struct pasid_state **ptr, *ret = NULL;
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unsigned long flags;
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spin_lock_irqsave(&dev_state->lock, flags);
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ptr = __get_pasid_state_ptr(dev_state, pasid, false);
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if (ptr == NULL)
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goto out_unlock;
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ret = *ptr;
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if (ret)
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atomic_inc(&ret->count);
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out_unlock:
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spin_unlock_irqrestore(&dev_state->lock, flags);
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return ret;
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}
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static void free_pasid_state(struct pasid_state *pasid_state)
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{
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kfree(pasid_state);
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}
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static void put_pasid_state(struct pasid_state *pasid_state)
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{
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if (atomic_dec_and_test(&pasid_state->count)) {
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put_device_state(pasid_state->device_state);
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mmput(pasid_state->mm);
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free_pasid_state(pasid_state);
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}
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}
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static void unbind_pasid(struct device_state *dev_state, int pasid)
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{
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struct pasid_state *pasid_state;
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pasid_state = get_pasid_state(dev_state, pasid);
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if (pasid_state == NULL)
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return;
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unlink_pasid_state(pasid_state);
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amd_iommu_domain_clear_gcr3(dev_state->domain, pasid);
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clear_pasid_state(dev_state, pasid);
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put_pasid_state(pasid_state); /* Reference taken in this function */
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put_pasid_state(pasid_state); /* Reference taken in bind() function */
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}
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static void free_pasid_states_level1(struct pasid_state **tbl)
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{
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int i;
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for (i = 0; i < 512; ++i) {
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if (tbl[i] == NULL)
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continue;
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free_page((unsigned long)tbl[i]);
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}
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}
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static void free_pasid_states_level2(struct pasid_state **tbl)
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{
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struct pasid_state **ptr;
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int i;
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for (i = 0; i < 512; ++i) {
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if (tbl[i] == NULL)
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continue;
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ptr = (struct pasid_state **)tbl[i];
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free_pasid_states_level1(ptr);
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}
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}
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static void free_pasid_states(struct device_state *dev_state)
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{
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struct pasid_state *pasid_state;
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int i;
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for (i = 0; i < dev_state->max_pasids; ++i) {
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pasid_state = get_pasid_state(dev_state, i);
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if (pasid_state == NULL)
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continue;
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unbind_pasid(dev_state, i);
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put_pasid_state(pasid_state);
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}
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if (dev_state->pasid_levels == 2)
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free_pasid_states_level2(dev_state->states);
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else if (dev_state->pasid_levels == 1)
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free_pasid_states_level1(dev_state->states);
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else if (dev_state->pasid_levels != 0)
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BUG();
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free_page((unsigned long)dev_state->states);
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}
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int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
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struct task_struct *task)
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{
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struct pasid_state *pasid_state;
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struct device_state *dev_state;
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u16 devid;
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int ret;
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might_sleep();
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if (!amd_iommu_v2_supported())
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return -ENODEV;
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devid = device_id(pdev);
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dev_state = get_device_state(devid);
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if (dev_state == NULL)
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return -EINVAL;
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ret = -EINVAL;
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if (pasid < 0 || pasid >= dev_state->max_pasids)
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goto out;
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ret = -ENOMEM;
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pasid_state = kzalloc(sizeof(*pasid_state), GFP_KERNEL);
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if (pasid_state == NULL)
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goto out;
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atomic_set(&pasid_state->count, 1);
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pasid_state->task = task;
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pasid_state->mm = get_task_mm(task);
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pasid_state->device_state = dev_state;
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pasid_state->pasid = pasid;
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if (pasid_state->mm == NULL)
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goto out_free;
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ret = set_pasid_state(dev_state, pasid_state, pasid);
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if (ret)
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goto out_free;
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ret = amd_iommu_domain_set_gcr3(dev_state->domain, pasid,
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__pa(pasid_state->mm->pgd));
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if (ret)
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goto out_clear_state;
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link_pasid_state(pasid_state);
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return 0;
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out_clear_state:
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clear_pasid_state(dev_state, pasid);
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out_free:
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put_pasid_state(pasid_state);
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out:
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put_device_state(dev_state);
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return ret;
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}
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EXPORT_SYMBOL(amd_iommu_bind_pasid);
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void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid)
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{
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struct device_state *dev_state;
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u16 devid;
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might_sleep();
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if (!amd_iommu_v2_supported())
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return;
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devid = device_id(pdev);
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dev_state = get_device_state(devid);
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if (dev_state == NULL)
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return;
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if (pasid < 0 || pasid >= dev_state->max_pasids)
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goto out;
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unbind_pasid(dev_state, pasid);
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out:
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put_device_state(dev_state);
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}
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EXPORT_SYMBOL(amd_iommu_unbind_pasid);
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int amd_iommu_init_device(struct pci_dev *pdev, int pasids)
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{
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struct device_state *dev_state;
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@ -199,6 +502,9 @@ void amd_iommu_free_device(struct pci_dev *pdev)
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spin_unlock_irqrestore(&state_lock, flags);
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/* Get rid of any remaining pasid states */
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free_pasid_states(dev_state);
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put_device_state(dev_state);
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}
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EXPORT_SYMBOL(amd_iommu_free_device);
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@ -24,9 +24,13 @@
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#ifdef CONFIG_AMD_IOMMU
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struct task_struct;
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struct pci_dev;
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extern int amd_iommu_detect(void);
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extern int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
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struct task_struct *task);
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extern void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid);
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/**
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@ -65,6 +69,28 @@ extern int amd_iommu_init_device(struct pci_dev *pdev, int pasids);
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*/
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extern void amd_iommu_free_device(struct pci_dev *pdev);
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/**
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* amd_iommu_bind_pasid() - Bind a given task to a PASID on a device
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* @pdev: The PCI device to bind the task to
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* @pasid: The PASID on the device the task should be bound to
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* @task: the task to bind
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*
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* The function returns 0 on success or a negative value on error.
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*/
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extern int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
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struct task_struct *task);
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/**
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* amd_iommu_unbind_pasid() - Unbind a PASID from its task on
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* a device
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* @pdev: The device of the PASID
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* @pasid: The PASID to unbind
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*
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* When this function returns the device is no longer using the PASID
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* and the PASID is no longer bound to its task.
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*/
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extern void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid);
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#else
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static inline int amd_iommu_detect(void) { return -ENODEV; }
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