cxl: Prevent adapter reset if an active context exists

This patch prevents resetting the cxl adapter via sysfs in presence of
one or more active cxl_context on it. This protects against an
unrecoverable error caused by PSL owning a dirty cache line even after
reset and host tries to touch the same cache line. In case a force reset
of the card is required irrespective of any active contexts, the int
value -1 can be stored in the 'reset' sysfs attribute of the card.

The patch introduces a new atomic_t member named contexts_num inside
struct cxl that holds the number of active context attached to the card
, which is checked against '0' before proceeding with the reset. To
prevent against a race condition where a context is activated just after
reset check is performed, the contexts_num is atomically set to '-1'
after reset-check to indicate that no more contexts can be activated on
the card anymore.

Before activating a context we atomically test if contexts_num is
non-negative and if so, increment its value by one. In case the value of
contexts_num is negative then it indicates that the card is about to be
reset and context activation is error-ed out at that point.

Fixes: 62fa19d4b4fd ("cxl: Add ability to reset the card")
Cc: stable@vger.kernel.org # v4.0+
Acked-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Vaibhav Jain <vaibhav@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/Documentation/ABI/testing/sysfs-class-cxl b/Documentation/ABI/testing/sysfs-class-cxl
index 4ba0a2a..640f65e 100644 (file)
--- a/Documentation/ABI/testing/sysfs-class-cxl
+++ b/Documentation/ABI/testing/sysfs-class-cxl
@@ -220,8 +220,11 @@ What:           /sys/class/cxl/<card>/reset
 Date:           October 2014
 Contact:        linuxppc-dev@lists.ozlabs.org
 Description:    write only
-                Writing 1 will issue a PERST to card which may cause the card
-                to reload the FPGA depending on load_image_on_perst.
+                Writing 1 will issue a PERST to card provided there are no
+                contexts active on any one of the card AFUs. This may cause
+                the card to reload the FPGA depending on load_image_on_perst.
+                Writing -1 will do a force PERST irrespective of any active
+                contexts on the card AFUs.
 Users:         https://github.com/ibm-capi/libcxl
 
 What:          /sys/class/cxl/<card>/perst_reloads_same_image (not in a guest)

diff --git a/drivers/misc/cxl/api.c b/drivers/misc/cxl/api.c
index f3d34b9..af23d7d 100644 (file)
--- a/drivers/misc/cxl/api.c
+++ b/drivers/misc/cxl/api.c
@@ -229,6 +229,14 @@ int cxl_start_context(struct cxl_context *ctx, u64 wed,
        if (ctx->status == STARTED)
                goto out; /* already started */
 
+       /*
+        * Increment the mapped context count for adapter. This also checks
+        * if adapter_context_lock is taken.
+        */
+       rc = cxl_adapter_context_get(ctx->afu->adapter);
+       if (rc)
+               goto out;
+
        if (task) {
                ctx->pid = get_task_pid(task, PIDTYPE_PID);
                ctx->glpid = get_task_pid(task->group_leader, PIDTYPE_PID);
@@ -240,6 +248,7 @@ int cxl_start_context(struct cxl_context *ctx, u64 wed,
 
        if ((rc = cxl_ops->attach_process(ctx, kernel, wed, 0))) {
                put_pid(ctx->pid);
+               cxl_adapter_context_put(ctx->afu->adapter);
                cxl_ctx_put();
                goto out;
        }

diff --git a/drivers/misc/cxl/context.c b/drivers/misc/cxl/context.c
index c466ee2..5e506c1 100644 (file)
--- a/drivers/misc/cxl/context.c
+++ b/drivers/misc/cxl/context.c
@@ -238,6 +238,9 @@ int __detach_context(struct cxl_context *ctx)
        put_pid(ctx->glpid);
 
        cxl_ctx_put();
+
+       /* Decrease the attached context count on the adapter */
+       cxl_adapter_context_put(ctx->afu->adapter);
        return 0;
 }
 

diff --git a/drivers/misc/cxl/cxl.h b/drivers/misc/cxl/cxl.h
index 01d372a..a144073 100644 (file)
--- a/drivers/misc/cxl/cxl.h
+++ b/drivers/misc/cxl/cxl.h
@@ -618,6 +618,14 @@ struct cxl {
        bool perst_select_user;
        bool perst_same_image;
        bool psl_timebase_synced;
+
+       /*
+        * number of contexts mapped on to this card. Possible values are:
+        * >0: Number of contexts mapped and new one can be mapped.
+        *  0: No active contexts and new ones can be mapped.
+        * -1: No contexts mapped and new ones cannot be mapped.
+        */
+       atomic_t contexts_num;
 };
 
 int cxl_pci_alloc_one_irq(struct cxl *adapter);
@@ -944,4 +952,20 @@ bool cxl_pci_is_vphb_device(struct pci_dev *dev);
 
 /* decode AFU error bits in the PSL register PSL_SERR_An */
 void cxl_afu_decode_psl_serr(struct cxl_afu *afu, u64 serr);
+
+/*
+ * Increments the number of attached contexts on an adapter.
+ * In case an adapter_context_lock is taken the return -EBUSY.
+ */
+int cxl_adapter_context_get(struct cxl *adapter);
+
+/* Decrements the number of attached contexts on an adapter */
+void cxl_adapter_context_put(struct cxl *adapter);
+
+/* If no active contexts then prevents contexts from being attached */
+int cxl_adapter_context_lock(struct cxl *adapter);
+
+/* Unlock the contexts-lock if taken. Warn and force unlock otherwise */
+void cxl_adapter_context_unlock(struct cxl *adapter);
+
 #endif

diff --git a/drivers/misc/cxl/file.c b/drivers/misc/cxl/file.c
index 5fb9894..d0b421f 100644 (file)
--- a/drivers/misc/cxl/file.c
+++ b/drivers/misc/cxl/file.c
@@ -205,11 +205,22 @@ static long afu_ioctl_start_work(struct cxl_context *ctx,
        ctx->pid = get_task_pid(current, PIDTYPE_PID);
        ctx->glpid = get_task_pid(current->group_leader, PIDTYPE_PID);
 
+       /*
+        * Increment the mapped context count for adapter. This also checks
+        * if adapter_context_lock is taken.
+        */
+       rc = cxl_adapter_context_get(ctx->afu->adapter);
+       if (rc) {
+               afu_release_irqs(ctx, ctx);
+               goto out;
+       }
+
        trace_cxl_attach(ctx, work.work_element_descriptor, work.num_interrupts, amr);
 
        if ((rc = cxl_ops->attach_process(ctx, false, work.work_element_descriptor,
                                                        amr))) {
                afu_release_irqs(ctx, ctx);
+               cxl_adapter_context_put(ctx->afu->adapter);
                goto out;
        }
 

diff --git a/drivers/misc/cxl/guest.c b/drivers/misc/cxl/guest.c
index 9aa58a7..3e102cd 100644 (file)
--- a/drivers/misc/cxl/guest.c
+++ b/drivers/misc/cxl/guest.c
@@ -1152,6 +1152,9 @@ struct cxl *cxl_guest_init_adapter(struct device_node *np, struct platform_devic
        if ((rc = cxl_sysfs_adapter_add(adapter)))
                goto err_put1;
 
+       /* release the context lock as the adapter is configured */
+       cxl_adapter_context_unlock(adapter);
+
        return adapter;
 
 err_put1:

diff --git a/drivers/misc/cxl/main.c b/drivers/misc/cxl/main.c
index d9be23b..62e0dfb 100644 (file)
--- a/drivers/misc/cxl/main.c
+++ b/drivers/misc/cxl/main.c
@@ -243,8 +243,10 @@ struct cxl *cxl_alloc_adapter(void)
        if (dev_set_name(&adapter->dev, "card%i", adapter->adapter_num))
                goto err2;
 
-       return adapter;
+       /* start with context lock taken */
+       atomic_set(&adapter->contexts_num, -1);
 
+       return adapter;
 err2:
        cxl_remove_adapter_nr(adapter);
 err1:
@@ -286,6 +288,44 @@ int cxl_afu_select_best_mode(struct cxl_afu *afu)
        return 0;
 }
 
+int cxl_adapter_context_get(struct cxl *adapter)
+{
+       int rc;
+
+       rc = atomic_inc_unless_negative(&adapter->contexts_num);
+       return rc >= 0 ? 0 : -EBUSY;
+}
+
+void cxl_adapter_context_put(struct cxl *adapter)
+{
+       atomic_dec_if_positive(&adapter->contexts_num);
+}
+
+int cxl_adapter_context_lock(struct cxl *adapter)
+{
+       int rc;
+       /* no active contexts -> contexts_num == 0 */
+       rc = atomic_cmpxchg(&adapter->contexts_num, 0, -1);
+       return rc ? -EBUSY : 0;
+}
+
+void cxl_adapter_context_unlock(struct cxl *adapter)
+{
+       int val = atomic_cmpxchg(&adapter->contexts_num, -1, 0);
+
+       /*
+        * contexts lock taken -> contexts_num == -1
+        * If not true then show a warning and force reset the lock.
+        * This will happen when context_unlock was requested without
+        * doing a context_lock.
+        */
+       if (val != -1) {
+               atomic_set(&adapter->contexts_num, 0);
+               WARN(1, "Adapter context unlocked with %d active contexts",
+                    val);
+       }
+}
+
 static int __init init_cxl(void)
 {
        int rc = 0;

diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c
index 7afad84..e96be9c 100644 (file)
--- a/drivers/misc/cxl/pci.c
+++ b/drivers/misc/cxl/pci.c
@@ -1487,6 +1487,8 @@ static int cxl_configure_adapter(struct cxl *adapter, struct pci_dev *dev)
        if ((rc = cxl_native_register_psl_err_irq(adapter)))
                goto err;
 
+       /* Release the context lock as adapter is configured */
+       cxl_adapter_context_unlock(adapter);
        return 0;
 
 err:

diff --git a/drivers/misc/cxl/sysfs.c b/drivers/misc/cxl/sysfs.c
index b043c20..a8b6d6a 100644 (file)
--- a/drivers/misc/cxl/sysfs.c
+++ b/drivers/misc/cxl/sysfs.c
@@ -75,12 +75,31 @@ static ssize_t reset_adapter_store(struct device *device,
        int val;
 
        rc = sscanf(buf, "%i", &val);
-       if ((rc != 1) || (val != 1))
+       if ((rc != 1) || (val != 1 && val != -1))
                return -EINVAL;
 
-       if ((rc = cxl_ops->adapter_reset(adapter)))
-               return rc;
-       return count;
+       /*
+        * See if we can lock the context mapping that's only allowed
+        * when there are no contexts attached to the adapter. Once
+        * taken this will also prevent any context from getting activated.
+        */
+       if (val == 1) {
+               rc =  cxl_adapter_context_lock(adapter);
+               if (rc)
+                       goto out;
+
+               rc = cxl_ops->adapter_reset(adapter);
+               /* In case reset failed release context lock */
+               if (rc)
+                       cxl_adapter_context_unlock(adapter);
+
+       } else if (val == -1) {
+               /* Perform a forced adapter reset */
+               rc = cxl_ops->adapter_reset(adapter);
+       }
+
+out:
+       return rc ? rc : count;
 }
 
 static ssize_t load_image_on_perst_show(struct device *device,