diff options
| -rw-r--r-- | drivers/misc/cxl/cxl.h | 6 | ||||
| -rw-r--r-- | drivers/misc/cxl/native.c | 31 | ||||
| -rw-r--r-- | drivers/misc/cxl/pci.c | 3 |
3 files changed, 39 insertions, 1 deletions
diff --git a/drivers/misc/cxl/cxl.h b/drivers/misc/cxl/cxl.h index 344a0ff8f8c7..01d372aba131 100644 --- a/drivers/misc/cxl/cxl.h +++ b/drivers/misc/cxl/cxl.h @@ -162,7 +162,10 @@ static const cxl_p2n_reg_t CXL_PSL_WED_An = {0x0A0}; #define CXL_PSL_SPAP_V 0x0000000000000001ULL /****** CXL_PSL_Control ****************************************************/ -#define CXL_PSL_Control_tb 0x0000000000000001ULL +#define CXL_PSL_Control_tb (0x1ull << (63-63)) +#define CXL_PSL_Control_Fr (0x1ull << (63-31)) +#define CXL_PSL_Control_Fs_MASK (0x3ull << (63-29)) +#define CXL_PSL_Control_Fs_Complete (0x3ull << (63-29)) /****** CXL_PSL_DLCNTL *****************************************************/ #define CXL_PSL_DLCNTL_D (0x1ull << (63-28)) @@ -854,6 +857,7 @@ int cxl_register_one_irq(struct cxl *adapter, irq_handler_t handler, int cxl_check_error(struct cxl_afu *afu); int cxl_afu_slbia(struct cxl_afu *afu); int cxl_tlb_slb_invalidate(struct cxl *adapter); +int cxl_data_cache_flush(struct cxl *adapter); int cxl_afu_disable(struct cxl_afu *afu); int cxl_psl_purge(struct cxl_afu *afu); diff --git a/drivers/misc/cxl/native.c b/drivers/misc/cxl/native.c index e606fdc4bc9c..a217a74ccc98 100644 --- a/drivers/misc/cxl/native.c +++ b/drivers/misc/cxl/native.c @@ -290,6 +290,37 @@ int cxl_tlb_slb_invalidate(struct cxl *adapter) return 0; } +int cxl_data_cache_flush(struct cxl *adapter) +{ + u64 reg; + unsigned long timeout = jiffies + (HZ * CXL_TIMEOUT); + + pr_devel("Flushing data cache\n"); + + reg = cxl_p1_read(adapter, CXL_PSL_Control); + reg |= CXL_PSL_Control_Fr; + cxl_p1_write(adapter, CXL_PSL_Control, reg); + + reg = cxl_p1_read(adapter, CXL_PSL_Control); + while ((reg & CXL_PSL_Control_Fs_MASK) != CXL_PSL_Control_Fs_Complete) { + if (time_after_eq(jiffies, timeout)) { + dev_warn(&adapter->dev, "WARNING: cache flush timed out!\n"); + return -EBUSY; + } + + if (!cxl_ops->link_ok(adapter, NULL)) { + dev_warn(&adapter->dev, "WARNING: link down when flushing cache\n"); + return -EIO; + } + cpu_relax(); + reg = cxl_p1_read(adapter, CXL_PSL_Control); + } + + reg &= ~CXL_PSL_Control_Fr; + cxl_p1_write(adapter, CXL_PSL_Control, reg); + return 0; +} + static int cxl_write_sstp(struct cxl_afu *afu, u64 sstp0, u64 sstp1) { int rc; diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c index cd922a80bf97..7afad8477ad5 100644 --- a/drivers/misc/cxl/pci.c +++ b/drivers/misc/cxl/pci.c @@ -1239,6 +1239,9 @@ int cxl_pci_reset(struct cxl *adapter) dev_info(&dev->dev, "CXL reset\n"); + /* the adapter is about to be reset, so ignore errors */ + cxl_data_cache_flush(adapter); + /* pcie_warm_reset requests a fundamental pci reset which includes a * PERST assert/deassert. PERST triggers a loading of the image * if "user" or "factory" is selected in sysfs */ |