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-rw-r--r--drivers/misc/genwqe/Kconfig6
-rw-r--r--drivers/misc/genwqe/card_base.c79
-rw-r--r--drivers/misc/genwqe/card_base.h2
-rw-r--r--drivers/misc/genwqe/card_ddcb.c24
-rw-r--r--drivers/misc/genwqe/card_debugfs.c7
-rw-r--r--drivers/misc/genwqe/card_dev.c5
-rw-r--r--drivers/misc/genwqe/card_utils.c10
7 files changed, 115 insertions, 18 deletions
diff --git a/drivers/misc/genwqe/Kconfig b/drivers/misc/genwqe/Kconfig
index 6069d8cd79d7..4c0a033cbfdb 100644
--- a/drivers/misc/genwqe/Kconfig
+++ b/drivers/misc/genwqe/Kconfig
@@ -11,3 +11,9 @@ menuconfig GENWQE
Enables PCIe card driver for IBM GenWQE accelerators.
The user-space interface is described in
include/linux/genwqe/genwqe_card.h.
+
+config GENWQE_PLATFORM_ERROR_RECOVERY
+ int "Use platform recovery procedures (0=off, 1=on)"
+ depends on GENWQE
+ default 1 if PPC64
+ default 0
diff --git a/drivers/misc/genwqe/card_base.c b/drivers/misc/genwqe/card_base.c
index e6cc3e1e7326..87ebaba9b133 100644
--- a/drivers/misc/genwqe/card_base.c
+++ b/drivers/misc/genwqe/card_base.c
@@ -140,6 +140,12 @@ static struct genwqe_dev *genwqe_dev_alloc(void)
cd->class_genwqe = class_genwqe;
cd->debugfs_genwqe = debugfs_genwqe;
+ /*
+ * This comes from kernel config option and can be overritten via
+ * debugfs.
+ */
+ cd->use_platform_recovery = CONFIG_GENWQE_PLATFORM_ERROR_RECOVERY;
+
init_waitqueue_head(&cd->queue_waitq);
spin_lock_init(&cd->file_lock);
@@ -943,6 +949,19 @@ static int genwqe_health_thread(void *data)
return 0;
fatal_error:
+ if (cd->use_platform_recovery) {
+ /*
+ * Since we use raw accessors, EEH errors won't be detected
+ * by the platform until we do a non-raw MMIO or config space
+ * read
+ */
+ readq(cd->mmio + IO_SLC_CFGREG_GFIR);
+
+ /* We do nothing if the card is going over PCI recovery */
+ if (pci_channel_offline(pci_dev))
+ return -EIO;
+ }
+
dev_err(&pci_dev->dev,
"[%s] card unusable. Please trigger unbind!\n", __func__);
@@ -1048,6 +1067,9 @@ static int genwqe_pci_setup(struct genwqe_dev *cd)
pci_set_master(pci_dev);
pci_enable_pcie_error_reporting(pci_dev);
+ /* EEH recovery requires PCIe fundamental reset */
+ pci_dev->needs_freset = 1;
+
/* request complete BAR-0 space (length = 0) */
cd->mmio_len = pci_resource_len(pci_dev, 0);
cd->mmio = pci_iomap(pci_dev, 0, 0);
@@ -1186,23 +1208,40 @@ static pci_ers_result_t genwqe_err_error_detected(struct pci_dev *pci_dev,
dev_err(&pci_dev->dev, "[%s] state=%d\n", __func__, state);
- if (pci_dev == NULL)
- return PCI_ERS_RESULT_NEED_RESET;
-
cd = dev_get_drvdata(&pci_dev->dev);
if (cd == NULL)
- return PCI_ERS_RESULT_NEED_RESET;
+ return PCI_ERS_RESULT_DISCONNECT;
- switch (state) {
- case pci_channel_io_normal:
- return PCI_ERS_RESULT_CAN_RECOVER;
- case pci_channel_io_frozen:
- return PCI_ERS_RESULT_NEED_RESET;
- case pci_channel_io_perm_failure:
+ /* Stop the card */
+ genwqe_health_check_stop(cd);
+ genwqe_stop(cd);
+
+ /*
+ * On permanent failure, the PCI code will call device remove
+ * after the return of this function.
+ * genwqe_stop() can be called twice.
+ */
+ if (state == pci_channel_io_perm_failure) {
return PCI_ERS_RESULT_DISCONNECT;
+ } else {
+ genwqe_pci_remove(cd);
+ return PCI_ERS_RESULT_NEED_RESET;
}
+}
+
+static pci_ers_result_t genwqe_err_slot_reset(struct pci_dev *pci_dev)
+{
+ int rc;
+ struct genwqe_dev *cd = dev_get_drvdata(&pci_dev->dev);
- return PCI_ERS_RESULT_NEED_RESET;
+ rc = genwqe_pci_setup(cd);
+ if (!rc) {
+ return PCI_ERS_RESULT_RECOVERED;
+ } else {
+ dev_err(&pci_dev->dev,
+ "err: problems with PCI setup (err=%d)\n", rc);
+ return PCI_ERS_RESULT_DISCONNECT;
+ }
}
static pci_ers_result_t genwqe_err_result_none(struct pci_dev *dev)
@@ -1210,8 +1249,22 @@ static pci_ers_result_t genwqe_err_result_none(struct pci_dev *dev)
return PCI_ERS_RESULT_NONE;
}
-static void genwqe_err_resume(struct pci_dev *dev)
+static void genwqe_err_resume(struct pci_dev *pci_dev)
{
+ int rc;
+ struct genwqe_dev *cd = dev_get_drvdata(&pci_dev->dev);
+
+ rc = genwqe_start(cd);
+ if (!rc) {
+ rc = genwqe_health_check_start(cd);
+ if (rc)
+ dev_err(&pci_dev->dev,
+ "err: cannot start health checking! (err=%d)\n",
+ rc);
+ } else {
+ dev_err(&pci_dev->dev,
+ "err: cannot start card services! (err=%d)\n", rc);
+ }
}
static int genwqe_sriov_configure(struct pci_dev *dev, int numvfs)
@@ -1234,7 +1287,7 @@ static struct pci_error_handlers genwqe_err_handler = {
.error_detected = genwqe_err_error_detected,
.mmio_enabled = genwqe_err_result_none,
.link_reset = genwqe_err_result_none,
- .slot_reset = genwqe_err_result_none,
+ .slot_reset = genwqe_err_slot_reset,
.resume = genwqe_err_resume,
};
diff --git a/drivers/misc/genwqe/card_base.h b/drivers/misc/genwqe/card_base.h
index 0e608a288603..67abd8cb2247 100644
--- a/drivers/misc/genwqe/card_base.h
+++ b/drivers/misc/genwqe/card_base.h
@@ -291,6 +291,8 @@ struct genwqe_dev {
struct task_struct *health_thread;
wait_queue_head_t health_waitq;
+ int use_platform_recovery; /* use platform recovery mechanisms */
+
/* char device */
dev_t devnum_genwqe; /* major/minor num card */
struct class *class_genwqe; /* reference to class object */
diff --git a/drivers/misc/genwqe/card_ddcb.c b/drivers/misc/genwqe/card_ddcb.c
index c8046db2d5a2..f0de6153bea2 100644
--- a/drivers/misc/genwqe/card_ddcb.c
+++ b/drivers/misc/genwqe/card_ddcb.c
@@ -1118,7 +1118,21 @@ static irqreturn_t genwqe_pf_isr(int irq, void *dev_id)
* safer, but slower for the good-case ... See above.
*/
gfir = __genwqe_readq(cd, IO_SLC_CFGREG_GFIR);
- if ((gfir & GFIR_ERR_TRIGGER) != 0x0) {
+ if (((gfir & GFIR_ERR_TRIGGER) != 0x0) &&
+ !pci_channel_offline(pci_dev)) {
+
+ if (cd->use_platform_recovery) {
+ /*
+ * Since we use raw accessors, EEH errors won't be
+ * detected by the platform until we do a non-raw
+ * MMIO or config space read
+ */
+ readq(cd->mmio + IO_SLC_CFGREG_GFIR);
+
+ /* Don't do anything if the PCI channel is frozen */
+ if (pci_channel_offline(pci_dev))
+ goto exit;
+ }
wake_up_interruptible(&cd->health_waitq);
@@ -1126,12 +1140,12 @@ static irqreturn_t genwqe_pf_isr(int irq, void *dev_id)
* By default GFIRs causes recovery actions. This
* count is just for debug when recovery is masked.
*/
- printk_ratelimited(KERN_ERR
- "%s %s: [%s] GFIR=%016llx\n",
- GENWQE_DEVNAME, dev_name(&pci_dev->dev),
- __func__, gfir);
+ dev_err_ratelimited(&pci_dev->dev,
+ "[%s] GFIR=%016llx\n",
+ __func__, gfir);
}
+ exit:
return IRQ_HANDLED;
}
diff --git a/drivers/misc/genwqe/card_debugfs.c b/drivers/misc/genwqe/card_debugfs.c
index 0a33ade64109..c9b4d6d0eb99 100644
--- a/drivers/misc/genwqe/card_debugfs.c
+++ b/drivers/misc/genwqe/card_debugfs.c
@@ -485,6 +485,13 @@ int genwqe_init_debugfs(struct genwqe_dev *cd)
goto err1;
}
+ file = debugfs_create_u32("use_platform_recovery", 0666, root,
+ &cd->use_platform_recovery);
+ if (!file) {
+ ret = -ENOMEM;
+ goto err1;
+ }
+
cd->debugfs_root = root;
return 0;
err1:
diff --git a/drivers/misc/genwqe/card_dev.c b/drivers/misc/genwqe/card_dev.c
index 1d2f163a1906..aae42555e2ca 100644
--- a/drivers/misc/genwqe/card_dev.c
+++ b/drivers/misc/genwqe/card_dev.c
@@ -1048,10 +1048,15 @@ static long genwqe_ioctl(struct file *filp, unsigned int cmd,
int rc = 0;
struct genwqe_file *cfile = (struct genwqe_file *)filp->private_data;
struct genwqe_dev *cd = cfile->cd;
+ struct pci_dev *pci_dev = cd->pci_dev;
struct genwqe_reg_io __user *io;
u64 val;
u32 reg_offs;
+ /* Return -EIO if card hit EEH */
+ if (pci_channel_offline(pci_dev))
+ return -EIO;
+
if (_IOC_TYPE(cmd) != GENWQE_IOC_CODE)
return -EINVAL;
diff --git a/drivers/misc/genwqe/card_utils.c b/drivers/misc/genwqe/card_utils.c
index 62cc6bb3f62e..4a500582eef0 100644
--- a/drivers/misc/genwqe/card_utils.c
+++ b/drivers/misc/genwqe/card_utils.c
@@ -53,12 +53,17 @@
*/
int __genwqe_writeq(struct genwqe_dev *cd, u64 byte_offs, u64 val)
{
+ struct pci_dev *pci_dev = cd->pci_dev;
+
if (cd->err_inject & GENWQE_INJECT_HARDWARE_FAILURE)
return -EIO;
if (cd->mmio == NULL)
return -EIO;
+ if (pci_channel_offline(pci_dev))
+ return -EIO;
+
__raw_writeq((__force u64)cpu_to_be64(val), cd->mmio + byte_offs);
return 0;
}
@@ -99,12 +104,17 @@ u64 __genwqe_readq(struct genwqe_dev *cd, u64 byte_offs)
*/
int __genwqe_writel(struct genwqe_dev *cd, u64 byte_offs, u32 val)
{
+ struct pci_dev *pci_dev = cd->pci_dev;
+
if (cd->err_inject & GENWQE_INJECT_HARDWARE_FAILURE)
return -EIO;
if (cd->mmio == NULL)
return -EIO;
+ if (pci_channel_offline(pci_dev))
+ return -EIO;
+
__raw_writel((__force u32)cpu_to_be32(val), cd->mmio + byte_offs);
return 0;
}
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-07-10 21:57:01 +0200