powerpc/pseries/eeh: Fix pseries_eeh_err_inject

VFIO_EEH_PE_INJECT_ERR ioctl is currently failing on pseries
due to missing implementation of err_inject eeh_ops for pseries.
This patch implements pseries_eeh_err_inject in eeh_ops/pseries
eeh_ops. Implements support for injecting MMIO load/store error
for testing from user space.

The check on PCI error type (bus type) code is moved to platform
code, since the eeh_pe_inject_err can be allowed to more error
types depending on platform requirement. Removal of the check for
'type' in eeh_pe_inject_err() doesn't impact PowerNV as
pnv_eeh_err_inject() already has an equivalent check in place.

Signed-off-by: Narayana Murty N <nnmlinux@linux.ibm.com>
Reviewed-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240909140220.529333-1-nnmlinux@linux.ibm.com

Author: NarayanamurtyN

arch/powerpc/include/asm/eeh.h

@@ -308,6 +308,7 @@ int eeh_pe_reset(struct eeh_pe *pe, int option, bool include_passed);
 int eeh_pe_configure(struct eeh_pe *pe);
 int eeh_pe_inject_err(struct eeh_pe *pe, int type, int func,
 		      unsigned long addr, unsigned long mask);
+int eeh_pe_inject_mmio_error(struct pci_dev *pdev);
 
 /**
  * EEH_POSSIBLE_ERROR() -- test for possible MMIO failure.

arch/powerpc/kernel/eeh.c

@@ -1537,10 +1537,6 @@ int eeh_pe_inject_err(struct eeh_pe *pe, int type, int func,
 	if (!eeh_ops || !eeh_ops->err_inject)
 		return -ENOENT;
 
-	/* Check on PCI error type */
-	if (type != EEH_ERR_TYPE_32 && type != EEH_ERR_TYPE_64)
-		return -EINVAL;
-
 	/* Check on PCI error function */
 	if (func < EEH_ERR_FUNC_MIN || func > EEH_ERR_FUNC_MAX)
 		return -EINVAL;
@@ -1848,6 +1844,11 @@ static const struct file_operations eeh_dev_break_fops = {
 	.read   = eeh_debugfs_dev_usage,
 };
 
+int eeh_pe_inject_mmio_error(struct pci_dev *pdev)
+{
+	return eeh_debugfs_break_device(pdev);
+}
+
 static ssize_t eeh_dev_can_recover(struct file *filp,
 				   const char __user *user_buf,
 				   size_t count, loff_t *ppos)

arch/powerpc/platforms/pseries/eeh_pseries.c

@@ -784,6 +784,43 @@ static int pseries_notify_resume(struct eeh_dev *edev)
 }
 #endif
 
+/**
+ * pseries_eeh_err_inject - Inject specified error to the indicated PE
+ * @pe: the indicated PE
+ * @type: error type
+ * @func: specific error type
+ * @addr: address
+ * @mask: address mask
+ * The routine is called to inject specified error, which is
+ * determined by @type and @func, to the indicated PE
+ */
+static int pseries_eeh_err_inject(struct eeh_pe *pe, int type, int func,
+				  unsigned long addr, unsigned long mask)
+{
+	struct	eeh_dev	*pdev;
+
+	/* Check on PCI error type */
+	if (type != EEH_ERR_TYPE_32 && type != EEH_ERR_TYPE_64)
+		return -EINVAL;
+
+	switch (func) {
+	case EEH_ERR_FUNC_LD_MEM_ADDR:
+	case EEH_ERR_FUNC_LD_MEM_DATA:
+	case EEH_ERR_FUNC_ST_MEM_ADDR:
+	case EEH_ERR_FUNC_ST_MEM_DATA:
+		/* injects a MMIO error for all pdev's belonging to PE */
+		pci_lock_rescan_remove();
+		list_for_each_entry(pdev, &pe->edevs, entry)
+			eeh_pe_inject_mmio_error(pdev->pdev);
+		pci_unlock_rescan_remove();
+		break;
+	default:
+		return -ERANGE;
+	}
+
+	return 0;
+}
+
 static struct eeh_ops pseries_eeh_ops = {
 	.name			= "pseries",
 	.probe			= pseries_eeh_probe,
@@ -792,7 +829,7 @@ static struct eeh_ops pseries_eeh_ops = {
 	.reset			= pseries_eeh_reset,
 	.get_log		= pseries_eeh_get_log,
 	.configure_bridge       = pseries_eeh_configure_bridge,
-	.err_inject		= NULL,
+	.err_inject		= pseries_eeh_err_inject,
 	.read_config		= pseries_eeh_read_config,
 	.write_config		= pseries_eeh_write_config,
 	.next_error		= NULL,