diff options
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-cxl | 8 | ||||
| -rw-r--r-- | drivers/misc/cxl/cxl.h | 1 | ||||
| -rw-r--r-- | drivers/misc/cxl/guest.c | 6 | ||||
| -rw-r--r-- | drivers/misc/cxl/pci.c | 21 | ||||
| -rw-r--r-- | drivers/misc/cxl/sysfs.c | 10 |
5 files changed, 37 insertions, 9 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-cxl b/Documentation/ABI/testing/sysfs-class-cxl index 7fd737eed38a..4ba0a2a61926 100644 --- a/Documentation/ABI/testing/sysfs-class-cxl +++ b/Documentation/ABI/testing/sysfs-class-cxl @@ -233,3 +233,11 @@ Description: read/write 0 = don't trust, the image may be different (default) 1 = trust that the image will not change. Users: https://github.com/ibm-capi/libcxl + +What: /sys/class/cxl/<card>/psl_timebase_synced +Date: March 2016 +Contact: linuxppc-dev@lists.ozlabs.org +Description: read only + Returns 1 if the psl timebase register is synchronized + with the core timebase register, 0 otherwise. +Users: https://github.com/ibm-capi/libcxl diff --git a/drivers/misc/cxl/cxl.h b/drivers/misc/cxl/cxl.h index 38e21cf7806e..dfdbfb025089 100644 --- a/drivers/misc/cxl/cxl.h +++ b/drivers/misc/cxl/cxl.h @@ -579,6 +579,7 @@ struct cxl { bool perst_loads_image; bool perst_select_user; bool perst_same_image; + bool psl_timebase_synced; }; int cxl_pci_alloc_one_irq(struct cxl *adapter); diff --git a/drivers/misc/cxl/guest.c b/drivers/misc/cxl/guest.c index 8213372de2b7..a83acf9f8cd9 100644 --- a/drivers/misc/cxl/guest.c +++ b/drivers/misc/cxl/guest.c @@ -1101,6 +1101,12 @@ struct cxl *cxl_guest_init_adapter(struct device_node *np, struct platform_devic adapter->dev.release = release_adapter; dev_set_drvdata(&pdev->dev, adapter); + /* + * Hypervisor controls PSL timebase initialization (p1 register). + * On FW840, PSL is initialized. + */ + adapter->psl_timebase_synced = true; + if ((rc = cxl_of_read_adapter_handle(adapter, np))) goto err1; diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c index 94fd3f71f838..c6d5cf5e3793 100644 --- a/drivers/misc/cxl/pci.c +++ b/drivers/misc/cxl/pci.c @@ -394,22 +394,24 @@ static int init_implementation_adapter_regs(struct cxl *adapter, struct pci_dev #define TBSYNC_CNT(n) (((u64)n & 0x7) << (63-6)) #define _2048_250MHZ_CYCLES 1 -static int cxl_setup_psl_timebase(struct cxl *adapter, struct pci_dev *dev) +static void cxl_setup_psl_timebase(struct cxl *adapter, struct pci_dev *dev) { u64 psl_tb; int delta; unsigned int retry = 0; struct device_node *np; + adapter->psl_timebase_synced = false; + if (!(np = pnv_pci_get_phb_node(dev))) - return -ENODEV; + return; /* Do not fail when CAPP timebase sync is not supported by OPAL */ of_node_get(np); if (! of_get_property(np, "ibm,capp-timebase-sync", NULL)) { of_node_put(np); - pr_err("PSL: Timebase sync: OPAL support missing\n"); - return 0; + dev_info(&dev->dev, "PSL timebase inactive: OPAL support missing\n"); + return; } of_node_put(np); @@ -428,8 +430,8 @@ static int cxl_setup_psl_timebase(struct cxl *adapter, struct pci_dev *dev) do { msleep(1); if (retry++ > 5) { - pr_err("PSL: Timebase sync: giving up!\n"); - return -EIO; + dev_info(&dev->dev, "PSL timebase can't synchronize\n"); + return; } psl_tb = cxl_p1_read(adapter, CXL_PSL_Timebase); delta = mftb() - psl_tb; @@ -437,7 +439,8 @@ static int cxl_setup_psl_timebase(struct cxl *adapter, struct pci_dev *dev) delta = -delta; } while (tb_to_ns(delta) > 16000); - return 0; + adapter->psl_timebase_synced = true; + return; } static int init_implementation_afu_regs(struct cxl_afu *afu) @@ -1183,8 +1186,8 @@ static int cxl_configure_adapter(struct cxl *adapter, struct pci_dev *dev) if ((rc = pnv_phb_to_cxl_mode(dev, OPAL_PHB_CAPI_MODE_SNOOP_ON))) goto err; - if ((rc = cxl_setup_psl_timebase(adapter, dev))) - goto err; + /* Ignore error, adapter init is not dependant on timebase sync */ + cxl_setup_psl_timebase(adapter, dev); if ((rc = cxl_native_register_psl_err_irq(adapter))) goto err; diff --git a/drivers/misc/cxl/sysfs.c b/drivers/misc/cxl/sysfs.c index 25913c08794c..b043c20f158f 100644 --- a/drivers/misc/cxl/sysfs.c +++ b/drivers/misc/cxl/sysfs.c @@ -57,6 +57,15 @@ static ssize_t image_loaded_show(struct device *device, return scnprintf(buf, PAGE_SIZE, "factory\n"); } +static ssize_t psl_timebase_synced_show(struct device *device, + struct device_attribute *attr, + char *buf) +{ + struct cxl *adapter = to_cxl_adapter(device); + + return scnprintf(buf, PAGE_SIZE, "%i\n", adapter->psl_timebase_synced); +} + static ssize_t reset_adapter_store(struct device *device, struct device_attribute *attr, const char *buf, size_t count) @@ -142,6 +151,7 @@ static struct device_attribute adapter_attrs[] = { __ATTR_RO(psl_revision), __ATTR_RO(base_image), __ATTR_RO(image_loaded), + __ATTR_RO(psl_timebase_synced), __ATTR_RW(load_image_on_perst), __ATTR_RW(perst_reloads_same_image), __ATTR(reset, S_IWUSR, NULL, reset_adapter_store), |