[PATCH v5 17/18] cxl: Adapter failure handling
Manoj Kumar
manoj at linux.vnet.ibm.com
Thu Feb 25 08:41:02 AEDT 2016
Reviewed-by: Manoj Kumar <manoj at linux.vnet.ibm.com>
---
Manoj Kumar
On 2/23/2016 10:21 AM, Frederic Barrat wrote:
> From: Christophe Lombard <clombard at linux.vnet.ibm.com>
>
> Check the AFU state whenever an API is called. The hypervisor may
> issue a reset of the adapter when it detects a fault. When it happens,
> it launches an error recovery which will either move the AFU to a
> permanent failure state, or in the disabled state.
> If the AFU is found to be disabled, detach all existing contexts from
> it before issuing a AFU reset to re-enable it.
>
> Before detaching contexts, notify any kernel driver through the EEH
> callbacks of the AFU pci device.
>
> Co-authored-by: Frederic Barrat <fbarrat at linux.vnet.ibm.com>
> Signed-off-by: Frederic Barrat <fbarrat at linux.vnet.ibm.com>
> Signed-off-by: Christophe Lombard <clombard at linux.vnet.ibm.com>
> Acked-by: Ian Munsie <imunsie at au1.ibm.com>
> ---
> drivers/misc/cxl/context.c | 2 +-
> drivers/misc/cxl/cxl.h | 18 ++---
> drivers/misc/cxl/file.c | 10 +--
> drivers/misc/cxl/guest.c | 167 ++++++++++++++++++++++++++++++++++++++++++++-
> drivers/misc/cxl/main.c | 2 +-
> drivers/misc/cxl/native.c | 32 ++++-----
> drivers/misc/cxl/vphb.c | 2 +-
> 7 files changed, 198 insertions(+), 35 deletions(-)
>
> diff --git a/drivers/misc/cxl/context.c b/drivers/misc/cxl/context.c
> index 180c85a..10370f2 100644
> --- a/drivers/misc/cxl/context.c
> +++ b/drivers/misc/cxl/context.c
> @@ -220,7 +220,7 @@ int __detach_context(struct cxl_context *ctx)
> * If detach fails when hw is down, we don't care.
> */
> WARN_ON(cxl_ops->detach_process(ctx) &&
> - cxl_ops->link_ok(ctx->afu->adapter));
> + cxl_ops->link_ok(ctx->afu->adapter, ctx->afu));
> flush_work(&ctx->fault_work); /* Only needed for dedicated process */
>
> /* release the reference to the group leader and mm handling pid */
> diff --git a/drivers/misc/cxl/cxl.h b/drivers/misc/cxl/cxl.h
> index 6c2521c..e9150c3 100644
> --- a/drivers/misc/cxl/cxl.h
> +++ b/drivers/misc/cxl/cxl.h
> @@ -373,6 +373,8 @@ struct cxl_afu_guest {
> phys_addr_t p2n_phys;
> u64 p2n_size;
> int max_ints;
> + struct mutex recovery_lock;
> + int previous_state;
> };
>
> struct cxl_afu {
> @@ -611,7 +613,7 @@ struct cxl_process_element {
> __be32 software_state;
> } __packed;
>
> -static inline bool cxl_adapter_link_ok(struct cxl *cxl)
> +static inline bool cxl_adapter_link_ok(struct cxl *cxl, struct cxl_afu *afu)
> {
> struct pci_dev *pdev;
>
> @@ -630,13 +632,13 @@ static inline void __iomem *_cxl_p1_addr(struct cxl *cxl, cxl_p1_reg_t reg)
>
> static inline void cxl_p1_write(struct cxl *cxl, cxl_p1_reg_t reg, u64 val)
> {
> - if (likely(cxl_adapter_link_ok(cxl)))
> + if (likely(cxl_adapter_link_ok(cxl, NULL)))
> out_be64(_cxl_p1_addr(cxl, reg), val);
> }
>
> static inline u64 cxl_p1_read(struct cxl *cxl, cxl_p1_reg_t reg)
> {
> - if (likely(cxl_adapter_link_ok(cxl)))
> + if (likely(cxl_adapter_link_ok(cxl, NULL)))
> return in_be64(_cxl_p1_addr(cxl, reg));
> else
> return ~0ULL;
> @@ -650,13 +652,13 @@ static inline void __iomem *_cxl_p1n_addr(struct cxl_afu *afu, cxl_p1n_reg_t reg
>
> static inline void cxl_p1n_write(struct cxl_afu *afu, cxl_p1n_reg_t reg, u64 val)
> {
> - if (likely(cxl_adapter_link_ok(afu->adapter)))
> + if (likely(cxl_adapter_link_ok(afu->adapter, afu)))
> out_be64(_cxl_p1n_addr(afu, reg), val);
> }
>
> static inline u64 cxl_p1n_read(struct cxl_afu *afu, cxl_p1n_reg_t reg)
> {
> - if (likely(cxl_adapter_link_ok(afu->adapter)))
> + if (likely(cxl_adapter_link_ok(afu->adapter, afu)))
> return in_be64(_cxl_p1n_addr(afu, reg));
> else
> return ~0ULL;
> @@ -669,13 +671,13 @@ static inline void __iomem *_cxl_p2n_addr(struct cxl_afu *afu, cxl_p2n_reg_t reg
>
> static inline void cxl_p2n_write(struct cxl_afu *afu, cxl_p2n_reg_t reg, u64 val)
> {
> - if (likely(cxl_adapter_link_ok(afu->adapter)))
> + if (likely(cxl_adapter_link_ok(afu->adapter, afu)))
> out_be64(_cxl_p2n_addr(afu, reg), val);
> }
>
> static inline u64 cxl_p2n_read(struct cxl_afu *afu, cxl_p2n_reg_t reg)
> {
> - if (likely(cxl_adapter_link_ok(afu->adapter)))
> + if (likely(cxl_adapter_link_ok(afu->adapter, afu)))
> return in_be64(_cxl_p2n_addr(afu, reg));
> else
> return ~0ULL;
> @@ -851,7 +853,7 @@ struct cxl_backend_ops {
> u64 wed, u64 amr);
> int (*detach_process)(struct cxl_context *ctx);
> bool (*support_attributes)(const char *attr_name);
> - bool (*link_ok)(struct cxl *cxl);
> + bool (*link_ok)(struct cxl *cxl, struct cxl_afu *afu);
> void (*release_afu)(struct device *dev);
> ssize_t (*afu_read_err_buffer)(struct cxl_afu *afu, char *buf,
> loff_t off, size_t count);
> diff --git a/drivers/misc/cxl/file.c b/drivers/misc/cxl/file.c
> index e160462..eec468f 100644
> --- a/drivers/misc/cxl/file.c
> +++ b/drivers/misc/cxl/file.c
> @@ -76,7 +76,7 @@ static int __afu_open(struct inode *inode, struct file *file, bool master)
> if (!afu->current_mode)
> goto err_put_afu;
>
> - if (!cxl_ops->link_ok(adapter)) {
> + if (!cxl_ops->link_ok(adapter, afu)) {
> rc = -EIO;
> goto err_put_afu;
> }
> @@ -257,7 +257,7 @@ long afu_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
> if (ctx->status == CLOSED)
> return -EIO;
>
> - if (!cxl_ops->link_ok(ctx->afu->adapter))
> + if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu))
> return -EIO;
>
> pr_devel("afu_ioctl\n");
> @@ -287,7 +287,7 @@ int afu_mmap(struct file *file, struct vm_area_struct *vm)
> if (ctx->status != STARTED)
> return -EIO;
>
> - if (!cxl_ops->link_ok(ctx->afu->adapter))
> + if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu))
> return -EIO;
>
> return cxl_context_iomap(ctx, vm);
> @@ -334,7 +334,7 @@ ssize_t afu_read(struct file *file, char __user *buf, size_t count,
> int rc;
> DEFINE_WAIT(wait);
>
> - if (!cxl_ops->link_ok(ctx->afu->adapter))
> + if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu))
> return -EIO;
>
> if (count < CXL_READ_MIN_SIZE)
> @@ -347,7 +347,7 @@ ssize_t afu_read(struct file *file, char __user *buf, size_t count,
> if (ctx_event_pending(ctx))
> break;
>
> - if (!cxl_ops->link_ok(ctx->afu->adapter)) {
> + if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu)) {
> rc = -EIO;
> goto out;
> }
> diff --git a/drivers/misc/cxl/guest.c b/drivers/misc/cxl/guest.c
> index 2563896..d19df59 100644
> --- a/drivers/misc/cxl/guest.c
> +++ b/drivers/misc/cxl/guest.c
> @@ -15,6 +15,46 @@
> #include "hcalls.h"
> #include "trace.h"
>
> +#define CXL_ERROR_DETECTED_EVENT 1
> +#define CXL_SLOT_RESET_EVENT 2
> +#define CXL_RESUME_EVENT 3
> +
> +static void pci_error_handlers(struct cxl_afu *afu,
> + int bus_error_event,
> + pci_channel_state_t state)
> +{
> + struct pci_dev *afu_dev;
> +
> + if (afu->phb == NULL)
> + return;
> +
> + list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) {
> + if (!afu_dev->driver)
> + continue;
> +
> + switch (bus_error_event) {
> + case CXL_ERROR_DETECTED_EVENT:
> + afu_dev->error_state = state;
> +
> + if (afu_dev->driver->err_handler &&
> + afu_dev->driver->err_handler->error_detected)
> + afu_dev->driver->err_handler->error_detected(afu_dev, state);
> + break;
> + case CXL_SLOT_RESET_EVENT:
> + afu_dev->error_state = state;
> +
> + if (afu_dev->driver->err_handler &&
> + afu_dev->driver->err_handler->slot_reset)
> + afu_dev->driver->err_handler->slot_reset(afu_dev);
> + break;
> + case CXL_RESUME_EVENT:
> + if (afu_dev->driver->err_handler &&
> + afu_dev->driver->err_handler->resume)
> + afu_dev->driver->err_handler->resume(afu_dev);
> + break;
> + }
> + }
> +}
>
> static irqreturn_t guest_handle_psl_slice_error(struct cxl_context *ctx, u64 dsisr,
> u64 errstat)
> @@ -133,6 +173,22 @@ static irqreturn_t guest_psl_irq(int irq, void *data)
> return rc;
> }
>
> +static int afu_read_error_state(struct cxl_afu *afu, int *state_out)
> +{
> + u64 state;
> + int rc = 0;
> +
> + rc = cxl_h_read_error_state(afu->guest->handle, &state);
> + if (!rc) {
> + WARN_ON(state != H_STATE_NORMAL &&
> + state != H_STATE_DISABLE &&
> + state != H_STATE_TEMP_UNAVAILABLE &&
> + state != H_STATE_PERM_UNAVAILABLE);
> + *state_out = state & 0xffffffff;
> + }
> + return rc;
> +}
> +
> static irqreturn_t guest_slice_irq_err(int irq, void *data)
> {
> struct cxl_afu *afu = data;
> @@ -201,10 +257,26 @@ static int irq_free_range(struct cxl *adapter, int irq, int len)
>
> static int guest_reset(struct cxl *adapter)
> {
> - int rc;
> + struct cxl_afu *afu = NULL;
> + int i, rc;
>
> pr_devel("Adapter reset request\n");
> + for (i = 0; i < adapter->slices; i++) {
> + if ((afu = adapter->afu[i])) {
> + pci_error_handlers(afu, CXL_ERROR_DETECTED_EVENT,
> + pci_channel_io_frozen);
> + cxl_context_detach_all(afu);
> + }
> + }
> +
> rc = cxl_h_reset_adapter(adapter->guest->handle);
> + for (i = 0; i < adapter->slices; i++) {
> + if (!rc && (afu = adapter->afu[i])) {
> + pci_error_handlers(afu, CXL_SLOT_RESET_EVENT,
> + pci_channel_io_normal);
> + pci_error_handlers(afu, CXL_RESUME_EVENT, 0);
> + }
> + }
> return rc;
> }
>
> @@ -556,7 +628,7 @@ static int guest_detach_process(struct cxl_context *ctx)
> pr_devel("in %s\n", __func__);
> trace_cxl_detach(ctx);
>
> - if (!cxl_ops->link_ok(ctx->afu->adapter))
> + if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu))
> return -EIO;
>
> if (ctx->afu->current_mode == CXL_MODE_DIRECTED)
> @@ -717,8 +789,95 @@ static void guest_unmap_slice_regs(struct cxl_afu *afu)
> iounmap(afu->p2n_mmio);
> }
>
> -static bool guest_link_ok(struct cxl *cxl)
> +static int afu_update_state(struct cxl_afu *afu)
> +{
> + int rc, cur_state;
> +
> + rc = afu_read_error_state(afu, &cur_state);
> + if (rc)
> + return rc;
> +
> + if (afu->guest->previous_state == cur_state)
> + return 0;
> +
> + pr_devel("AFU(%d) update state to %#x\n", afu->slice, cur_state);
> +
> + switch (cur_state) {
> + case H_STATE_NORMAL:
> + afu->guest->previous_state = cur_state;
> + rc = 1;
> + break;
> +
> + case H_STATE_DISABLE:
> + pci_error_handlers(afu, CXL_ERROR_DETECTED_EVENT,
> + pci_channel_io_frozen);
> +
> + cxl_context_detach_all(afu);
> + if ((rc = cxl_ops->afu_reset(afu)))
> + pr_devel("reset hcall failed %d\n", rc);
> +
> + rc = afu_read_error_state(afu, &cur_state);
> + if (!rc && cur_state == H_STATE_NORMAL) {
> + pci_error_handlers(afu, CXL_SLOT_RESET_EVENT,
> + pci_channel_io_normal);
> + pci_error_handlers(afu, CXL_RESUME_EVENT, 0);
> + rc = 1;
> + }
> + afu->guest->previous_state = 0;
> + break;
> +
> + case H_STATE_TEMP_UNAVAILABLE:
> + afu->guest->previous_state = cur_state;
> + break;
> +
> + case H_STATE_PERM_UNAVAILABLE:
> + dev_err(&afu->dev, "AFU is in permanent error state\n");
> + pci_error_handlers(afu, CXL_ERROR_DETECTED_EVENT,
> + pci_channel_io_perm_failure);
> + afu->guest->previous_state = cur_state;
> + break;
> +
> + default:
> + pr_err("Unexpected AFU(%d) error state: %#x\n",
> + afu->slice, cur_state);
> + return -EINVAL;
> + }
> +
> + return rc;
> +}
> +
> +static int afu_do_recovery(struct cxl_afu *afu)
> {
> + int rc;
> +
> + /* many threads can arrive here, in case of detach_all for example.
> + * Only one needs to drive the recovery
> + */
> + if (mutex_trylock(&afu->guest->recovery_lock)) {
> + rc = afu_update_state(afu);
> + mutex_unlock(&afu->guest->recovery_lock);
> + return rc;
> + }
> + return 0;
> +}
> +
> +static bool guest_link_ok(struct cxl *cxl, struct cxl_afu *afu)
> +{
> + int state;
> +
> + if (afu) {
> + if (afu_read_error_state(afu, &state) ||
> + state != H_STATE_NORMAL) {
> + if (afu_do_recovery(afu) > 0) {
> + /* check again in case we've just fixed it */
> + if (!afu_read_error_state(afu, &state) &&
> + state == H_STATE_NORMAL)
> + return true;
> + }
> + return false;
> + }
> + }
> +
> return true;
> }
>
> @@ -757,6 +916,8 @@ int cxl_guest_init_afu(struct cxl *adapter, int slice, struct device_node *afu_n
> return -ENOMEM;
> }
>
> + mutex_init(&afu->guest->recovery_lock);
> +
> if ((rc = dev_set_name(&afu->dev, "afu%i.%i",
> adapter->adapter_num,
> slice)))
> diff --git a/drivers/misc/cxl/main.c b/drivers/misc/cxl/main.c
> index b3c3ebf..b5eeb71 100644
> --- a/drivers/misc/cxl/main.c
> +++ b/drivers/misc/cxl/main.c
> @@ -48,7 +48,7 @@ int cxl_afu_slbia(struct cxl_afu *afu)
> /* 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))
> + if (!cxl_ops->link_ok(afu->adapter, afu))
> return -EIO;
> cpu_relax();
> }
> diff --git a/drivers/misc/cxl/native.c b/drivers/misc/cxl/native.c
> index 1ca1011..2235311 100644
> --- a/drivers/misc/cxl/native.c
> +++ b/drivers/misc/cxl/native.c
> @@ -42,7 +42,7 @@ static int afu_control(struct cxl_afu *afu, u64 command,
> goto out;
> }
>
> - if (!cxl_ops->link_ok(afu->adapter)) {
> + if (!cxl_ops->link_ok(afu->adapter, afu)) {
> afu->enabled = enabled;
> rc = -EIO;
> goto out;
> @@ -92,7 +92,7 @@ static int native_afu_reset(struct cxl_afu *afu)
>
> static int native_afu_check_and_enable(struct cxl_afu *afu)
> {
> - if (!cxl_ops->link_ok(afu->adapter)) {
> + if (!cxl_ops->link_ok(afu->adapter, afu)) {
> WARN(1, "Refusing to enable afu while link down!\n");
> return -EIO;
> }
> @@ -114,7 +114,7 @@ int cxl_psl_purge(struct cxl_afu *afu)
>
> pr_devel("PSL purge request\n");
>
> - if (!cxl_ops->link_ok(afu->adapter)) {
> + if (!cxl_ops->link_ok(afu->adapter, afu)) {
> dev_warn(&afu->dev, "PSL Purge called with link down, ignoring\n");
> rc = -EIO;
> goto out;
> @@ -136,7 +136,7 @@ int cxl_psl_purge(struct cxl_afu *afu)
> rc = -EBUSY;
> goto out;
> }
> - if (!cxl_ops->link_ok(afu->adapter)) {
> + if (!cxl_ops->link_ok(afu->adapter, afu)) {
> rc = -EIO;
> goto out;
> }
> @@ -250,7 +250,7 @@ int cxl_tlb_slb_invalidate(struct cxl *adapter)
> dev_warn(&adapter->dev, "WARNING: CXL adapter wide TLBIA timed out!\n");
> return -EBUSY;
> }
> - if (!cxl_ops->link_ok(adapter))
> + if (!cxl_ops->link_ok(adapter, NULL))
> return -EIO;
> cpu_relax();
> }
> @@ -261,7 +261,7 @@ int cxl_tlb_slb_invalidate(struct cxl *adapter)
> dev_warn(&adapter->dev, "WARNING: CXL adapter wide SLBIA timed out!\n");
> return -EBUSY;
> }
> - if (!cxl_ops->link_ok(adapter))
> + if (!cxl_ops->link_ok(adapter, NULL))
> return -EIO;
> cpu_relax();
> }
> @@ -302,7 +302,7 @@ static void slb_invalid(struct cxl_context *ctx)
> cxl_p1_write(adapter, CXL_PSL_SLBIA, CXL_TLB_SLB_IQ_LPIDPID);
>
> while (1) {
> - if (!cxl_ops->link_ok(adapter))
> + if (!cxl_ops->link_ok(adapter, NULL))
> break;
> slbia = cxl_p1_read(adapter, CXL_PSL_SLBIA);
> if (!(slbia & CXL_TLB_SLB_P))
> @@ -333,7 +333,7 @@ static int do_process_element_cmd(struct cxl_context *ctx,
> rc = -EBUSY;
> goto out;
> }
> - if (!cxl_ops->link_ok(ctx->afu->adapter)) {
> + if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu)) {
> dev_warn(&ctx->afu->dev, "WARNING: Device link down, aborting Process Element Command!\n");
> rc = -EIO;
> goto out;
> @@ -389,7 +389,7 @@ static int terminate_process_element(struct cxl_context *ctx)
> * should always succeed: it's not running if the hw has gone
> * away and is being reset.
> */
> - if (cxl_ops->link_ok(ctx->afu->adapter))
> + if (cxl_ops->link_ok(ctx->afu->adapter, ctx->afu))
> rc = do_process_element_cmd(ctx, CXL_SPA_SW_CMD_TERMINATE,
> CXL_PE_SOFTWARE_STATE_V | CXL_PE_SOFTWARE_STATE_T);
> ctx->elem->software_state = 0; /* Remove Valid bit */
> @@ -408,7 +408,7 @@ static int remove_process_element(struct cxl_context *ctx)
> /* We could be asked to remove when the hw is down. Again, if
> * the hw is down, the PE is gone, so we succeed.
> */
> - if (cxl_ops->link_ok(ctx->afu->adapter))
> + if (cxl_ops->link_ok(ctx->afu->adapter, ctx->afu))
> rc = do_process_element_cmd(ctx, CXL_SPA_SW_CMD_REMOVE, 0);
>
> if (!rc)
> @@ -650,7 +650,7 @@ static int native_afu_activate_mode(struct cxl_afu *afu, int mode)
> if (!(mode & afu->modes_supported))
> return -EINVAL;
>
> - if (!cxl_ops->link_ok(afu->adapter)) {
> + if (!cxl_ops->link_ok(afu->adapter, afu)) {
> WARN(1, "Device link is down, refusing to activate!\n");
> return -EIO;
> }
> @@ -666,7 +666,7 @@ static int native_afu_activate_mode(struct cxl_afu *afu, int mode)
> static int native_attach_process(struct cxl_context *ctx, bool kernel,
> u64 wed, u64 amr)
> {
> - if (!cxl_ops->link_ok(ctx->afu->adapter)) {
> + if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu)) {
> WARN(1, "Device link is down, refusing to attach process!\n");
> return -EIO;
> }
> @@ -718,7 +718,7 @@ static int native_get_irq_info(struct cxl_afu *afu, struct cxl_irq_info *info)
> /* If the adapter has gone away, we can't get any meaningful
> * information.
> */
> - if (!cxl_ops->link_ok(afu->adapter))
> + if (!cxl_ops->link_ok(afu->adapter, afu))
> return -EIO;
>
> info->dsisr = cxl_p2n_read(afu, CXL_PSL_DSISR_An);
> @@ -974,7 +974,7 @@ static bool native_support_attributes(const char *attr_name)
>
> static int native_afu_cr_read64(struct cxl_afu *afu, int cr, u64 off, u64 *out)
> {
> - if (unlikely(!cxl_ops->link_ok(afu->adapter)))
> + if (unlikely(!cxl_ops->link_ok(afu->adapter, afu)))
> return -EIO;
> if (unlikely(off >= afu->crs_len))
> return -ERANGE;
> @@ -985,7 +985,7 @@ static int native_afu_cr_read64(struct cxl_afu *afu, int cr, u64 off, u64 *out)
>
> static int native_afu_cr_read32(struct cxl_afu *afu, int cr, u64 off, u32 *out)
> {
> - if (unlikely(!cxl_ops->link_ok(afu->adapter)))
> + if (unlikely(!cxl_ops->link_ok(afu->adapter, afu)))
> return -EIO;
> if (unlikely(off >= afu->crs_len))
> return -ERANGE;
> @@ -1020,7 +1020,7 @@ static int native_afu_cr_read8(struct cxl_afu *afu, int cr, u64 off, u8 *out)
>
> static int native_afu_cr_write32(struct cxl_afu *afu, int cr, u64 off, u32 in)
> {
> - if (unlikely(!cxl_ops->link_ok(afu->adapter)))
> + if (unlikely(!cxl_ops->link_ok(afu->adapter, afu)))
> return -EIO;
> if (unlikely(off >= afu->crs_len))
> return -ERANGE;
> diff --git a/drivers/misc/cxl/vphb.c b/drivers/misc/cxl/vphb.c
> index c960a09..490b934 100644
> --- a/drivers/misc/cxl/vphb.c
> +++ b/drivers/misc/cxl/vphb.c
> @@ -49,7 +49,7 @@ static bool cxl_pci_enable_device_hook(struct pci_dev *dev)
> phb = pci_bus_to_host(dev->bus);
> afu = (struct cxl_afu *)phb->private_data;
>
> - if (!cxl_ops->link_ok(afu->adapter)) {
> + if (!cxl_ops->link_ok(afu->adapter, afu)) {
> dev_warn(&dev->dev, "%s: Device link is down, refusing to enable AFU\n", __func__);
> return false;
> }
>
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