@@ -11,6 +11,7 @@
#include <linux/fs.h>
#include <linux/poll.h>
#include <linux/iommu.h>
+#include <linux/xarray.h>
#include <uapi/linux/idxd.h>
#include "registers.h"
#include "idxd.h"
@@ -36,6 +37,7 @@ struct idxd_user_context {
unsigned int pasid;
unsigned int flags;
struct iommu_sva *sva;
+ u64 counters[COUNTER_MAX];
};
static void idxd_cdev_dev_release(struct device *dev)
@@ -68,6 +70,36 @@ static inline struct idxd_wq *inode_wq(struct inode *inode)
return idxd_cdev->wq;
}
+void idxd_user_counter_increment(struct idxd_wq *wq, u32 pasid, int index)
+{
+ struct idxd_user_context *ctx;
+
+ if (index >= COUNTER_MAX)
+ return;
+
+ mutex_lock(&wq->uc_lock);
+ ctx = xa_load(&wq->upasid_xa, pasid);
+ if (!ctx) {
+ mutex_unlock(&wq->uc_lock);
+ return;
+ }
+ ctx->counters[index]++;
+ mutex_unlock(&wq->uc_lock);
+}
+
+static void idxd_xa_pasid_remove(struct idxd_user_context *ctx)
+{
+ struct idxd_wq *wq = ctx->wq;
+ void *ptr;
+
+ mutex_lock(&wq->uc_lock);
+ ptr = xa_cmpxchg(&wq->upasid_xa, ctx->pasid, ctx, NULL, GFP_KERNEL);
+ if (ptr != (void *)ctx)
+ dev_warn(&wq->idxd->pdev->dev, "xarray cmpxchg failed for pasid %u\n",
+ ctx->pasid);
+ mutex_unlock(&wq->uc_lock);
+}
+
static int idxd_cdev_open(struct inode *inode, struct file *filp)
{
struct idxd_user_context *ctx;
@@ -108,20 +140,25 @@ static int idxd_cdev_open(struct inode *inode, struct file *filp)
pasid = iommu_sva_get_pasid(sva);
if (pasid == IOMMU_PASID_INVALID) {
- iommu_sva_unbind_device(sva);
rc = -EINVAL;
- goto failed;
+ goto failed_get_pasid;
}
ctx->sva = sva;
ctx->pasid = pasid;
+ mutex_lock(&wq->uc_lock);
+ rc = xa_insert(&wq->upasid_xa, pasid, ctx, GFP_KERNEL);
+ mutex_unlock(&wq->uc_lock);
+ if (rc < 0)
+ dev_warn(dev, "PASID entry already exist in xarray.\n");
+
if (wq_dedicated(wq)) {
rc = idxd_wq_set_pasid(wq, pasid);
if (rc < 0) {
iommu_sva_unbind_device(sva);
dev_err(dev, "wq set pasid failed: %d\n", rc);
- goto failed;
+ goto failed_set_pasid;
}
}
}
@@ -130,6 +167,12 @@ static int idxd_cdev_open(struct inode *inode, struct file *filp)
mutex_unlock(&wq->wq_lock);
return 0;
+ failed_set_pasid:
+ if (device_user_pasid_enabled(idxd))
+ idxd_xa_pasid_remove(ctx);
+ failed_get_pasid:
+ if (device_user_pasid_enabled(idxd))
+ iommu_sva_unbind_device(sva);
failed:
mutex_unlock(&wq->wq_lock);
kfree(ctx);
@@ -193,6 +236,7 @@ static int idxd_cdev_release(struct inode *node, struct file *filep)
if (ctx->sva) {
idxd_cdev_evl_drain_pasid(wq, ctx->pasid);
iommu_sva_unbind_device(ctx->sva);
+ idxd_xa_pasid_remove(ctx);
}
kfree(ctx);
@@ -127,6 +127,12 @@ struct idxd_pmu {
#define IDXD_MAX_PRIORITY 0xf
+enum {
+ COUNTER_FAULTS = 0,
+ COUNTER_FAULT_FAILS,
+ COUNTER_MAX
+};
+
enum idxd_wq_state {
IDXD_WQ_DISABLED = 0,
IDXD_WQ_ENABLED,
@@ -215,6 +221,10 @@ struct idxd_wq {
char name[WQ_NAME_SIZE + 1];
u64 max_xfer_bytes;
u32 max_batch_size;
+
+ /* Lock to protect upasid_xa access. */
+ struct mutex uc_lock;
+ struct xarray upasid_xa;
};
struct idxd_engine {
@@ -707,6 +717,7 @@ void idxd_cdev_remove(void);
int idxd_cdev_get_major(struct idxd_device *idxd);
int idxd_wq_add_cdev(struct idxd_wq *wq);
void idxd_wq_del_cdev(struct idxd_wq *wq);
+void idxd_user_counter_increment(struct idxd_wq *wq, u32 pasid, int index);
/* perfmon */
#if IS_ENABLED(CONFIG_INTEL_IDXD_PERFMON)
@@ -206,6 +206,8 @@ static int idxd_setup_wqs(struct idxd_device *idxd)
}
bitmap_copy(wq->opcap_bmap, idxd->opcap_bmap, IDXD_MAX_OPCAP_BITS);
}
+ mutex_init(&wq->uc_lock);
+ xa_init(&wq->upasid_xa);
idxd->wqs[i] = wq;
}
@@ -241,6 +241,7 @@ static void idxd_evl_fault_work(struct work_struct *work)
evl->batch_fail[entry_head->batch_id] = false;
copy_size = cr_size;
+ idxd_user_counter_increment(wq, entry_head->pasid, COUNTER_FAULTS);
break;
case DSA_COMP_BATCH_EVL_ERR:
bf = &evl->batch_fail[entry_head->batch_id];
@@ -252,6 +253,7 @@ static void idxd_evl_fault_work(struct work_struct *work)
*result = 1;
*bf = false;
}
+ idxd_user_counter_increment(wq, entry_head->pasid, COUNTER_FAULTS);
break;
case DSA_COMP_DRAIN_EVL:
copy_size = cr_size;
@@ -275,6 +277,7 @@ static void idxd_evl_fault_work(struct work_struct *work)
switch (fault->status) {
case DSA_COMP_CRA_XLAT:
if (copied != copy_size) {
+ idxd_user_counter_increment(wq, entry_head->pasid, COUNTER_FAULT_FAILS);
dev_err(dev, "Failed to write to completion record: (%d:%d)\n",
copy_size, copied);
if (entry_head->batch)
@@ -283,6 +286,7 @@ static void idxd_evl_fault_work(struct work_struct *work)
break;
case DSA_COMP_BATCH_EVL_ERR:
if (copied != copy_size) {
+ idxd_user_counter_increment(wq, entry_head->pasid, COUNTER_FAULT_FAILS);
dev_err(dev, "Failed to write to batch completion record: (%d:%d)\n",
copy_size, copied);
}
@@ -1292,6 +1292,7 @@ static void idxd_conf_wq_release(struct device *dev)
bitmap_free(wq->opcap_bmap);
kfree(wq->wqcfg);
+ xa_destroy(&wq->upasid_xa);
kfree(wq);
}