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Diffstat (limited to 'drivers/misc/cxl/main.c')
-rw-r--r--drivers/misc/cxl/main.c122
1 files changed, 114 insertions, 8 deletions
diff --git a/drivers/misc/cxl/main.c b/drivers/misc/cxl/main.c
index 9fde75ed4fac..ae68c3201156 100644
--- a/drivers/misc/cxl/main.c
+++ b/drivers/misc/cxl/main.c
@@ -32,6 +32,29 @@ uint cxl_verbose;
module_param_named(verbose, cxl_verbose, uint, 0600);
MODULE_PARM_DESC(verbose, "Enable verbose dmesg output");
+const struct cxl_backend_ops *cxl_ops;
+
+int cxl_afu_slbia(struct cxl_afu *afu)
+{
+ unsigned long timeout = jiffies + (HZ * CXL_TIMEOUT);
+
+ pr_devel("cxl_afu_slbia issuing SLBIA command\n");
+ cxl_p2n_write(afu, CXL_SLBIA_An, CXL_TLB_SLB_IQ_ALL);
+ while (cxl_p2n_read(afu, CXL_SLBIA_An) & CXL_TLB_SLB_P) {
+ if (time_after_eq(jiffies, timeout)) {
+ dev_warn(&afu->dev, "WARNING: CXL AFU SLBIA timed out!\n");
+ return -EBUSY;
+ }
+ /* If the adapter has gone down, we can assume that we
+ * will PERST it and that will invalidate everything.
+ */
+ if (!cxl_ops->link_ok(afu->adapter, afu))
+ return -EIO;
+ cpu_relax();
+ }
+ return 0;
+}
+
static inline void _cxl_slbia(struct cxl_context *ctx, struct mm_struct *mm)
{
struct task_struct *task;
@@ -139,6 +162,32 @@ int cxl_alloc_sst(struct cxl_context *ctx)
return 0;
}
+/* print buffer content as integers when debugging */
+void cxl_dump_debug_buffer(void *buf, size_t buf_len)
+{
+#ifdef DEBUG
+ int i, *ptr;
+
+ /*
+ * We want to regroup up to 4 integers per line, which means they
+ * need to be in the same pr_devel() statement
+ */
+ ptr = (int *) buf;
+ for (i = 0; i * 4 < buf_len; i += 4) {
+ if ((i + 3) * 4 < buf_len)
+ pr_devel("%.8x %.8x %.8x %.8x\n", ptr[i], ptr[i + 1],
+ ptr[i + 2], ptr[i + 3]);
+ else if ((i + 2) * 4 < buf_len)
+ pr_devel("%.8x %.8x %.8x\n", ptr[i], ptr[i + 1],
+ ptr[i + 2]);
+ else if ((i + 1) * 4 < buf_len)
+ pr_devel("%.8x %.8x\n", ptr[i], ptr[i + 1]);
+ else
+ pr_devel("%.8x\n", ptr[i]);
+ }
+#endif /* DEBUG */
+}
+
/* Find a CXL adapter by it's number and increase it's refcount */
struct cxl *get_cxl_adapter(int num)
{
@@ -152,7 +201,7 @@ struct cxl *get_cxl_adapter(int num)
return adapter;
}
-int cxl_alloc_adapter_nr(struct cxl *adapter)
+static int cxl_alloc_adapter_nr(struct cxl *adapter)
{
int i;
@@ -174,13 +223,58 @@ void cxl_remove_adapter_nr(struct cxl *adapter)
idr_remove(&cxl_adapter_idr, adapter->adapter_num);
}
+struct cxl *cxl_alloc_adapter(void)
+{
+ struct cxl *adapter;
+
+ if (!(adapter = kzalloc(sizeof(struct cxl), GFP_KERNEL)))
+ return NULL;
+
+ spin_lock_init(&adapter->afu_list_lock);
+
+ if (cxl_alloc_adapter_nr(adapter))
+ goto err1;
+
+ if (dev_set_name(&adapter->dev, "card%i", adapter->adapter_num))
+ goto err2;
+
+ return adapter;
+
+err2:
+ cxl_remove_adapter_nr(adapter);
+err1:
+ kfree(adapter);
+ return NULL;
+}
+
+struct cxl_afu *cxl_alloc_afu(struct cxl *adapter, int slice)
+{
+ struct cxl_afu *afu;
+
+ if (!(afu = kzalloc(sizeof(struct cxl_afu), GFP_KERNEL)))
+ return NULL;
+
+ afu->adapter = adapter;
+ afu->dev.parent = &adapter->dev;
+ afu->dev.release = cxl_ops->release_afu;
+ afu->slice = slice;
+ idr_init(&afu->contexts_idr);
+ mutex_init(&afu->contexts_lock);
+ spin_lock_init(&afu->afu_cntl_lock);
+
+ afu->prefault_mode = CXL_PREFAULT_NONE;
+ afu->irqs_max = afu->adapter->user_irqs;
+
+ return afu;
+}
+
int cxl_afu_select_best_mode(struct cxl_afu *afu)
{
if (afu->modes_supported & CXL_MODE_DIRECTED)
- return cxl_afu_activate_mode(afu, CXL_MODE_DIRECTED);
+ return cxl_ops->afu_activate_mode(afu, CXL_MODE_DIRECTED);
if (afu->modes_supported & CXL_MODE_DEDICATED)
- return cxl_afu_activate_mode(afu, CXL_MODE_DEDICATED);
+ return cxl_ops->afu_activate_mode(afu, CXL_MODE_DEDICATED);
dev_warn(&afu->dev, "No supported programming modes available\n");
/* We don't fail this so the user can inspect sysfs */
@@ -191,9 +285,6 @@ static int __init init_cxl(void)
{
int rc = 0;
- if (!cpu_has_feature(CPU_FTR_HVMODE))
- return -EPERM;
-
if ((rc = cxl_file_init()))
return rc;
@@ -202,7 +293,17 @@ static int __init init_cxl(void)
if ((rc = register_cxl_calls(&cxl_calls)))
goto err;
- if ((rc = pci_register_driver(&cxl_pci_driver)))
+ if (cpu_has_feature(CPU_FTR_HVMODE)) {
+ cxl_ops = &cxl_native_ops;
+ rc = pci_register_driver(&cxl_pci_driver);
+ }
+#ifdef CONFIG_PPC_PSERIES
+ else {
+ cxl_ops = &cxl_guest_ops;
+ rc = platform_driver_register(&cxl_of_driver);
+ }
+#endif
+ if (rc)
goto err1;
return 0;
@@ -217,7 +318,12 @@ err:
static void exit_cxl(void)
{
- pci_unregister_driver(&cxl_pci_driver);
+ if (cpu_has_feature(CPU_FTR_HVMODE))
+ pci_unregister_driver(&cxl_pci_driver);
+#ifdef CONFIG_PPC_PSERIES
+ else
+ platform_driver_unregister(&cxl_of_driver);
+#endif
cxl_debugfs_exit();
cxl_file_exit();