diff options
| -rw-r--r-- | drivers/staging/rdma/hfi1/chip.c | 2 | ||||
| -rw-r--r-- | drivers/staging/rdma/hfi1/chip.h | 30 | ||||
| -rw-r--r-- | drivers/staging/rdma/hfi1/firmware.c | 187 |
3 files changed, 219 insertions, 0 deletions
diff --git a/drivers/staging/rdma/hfi1/chip.c b/drivers/staging/rdma/hfi1/chip.c index 686cadf449b9..98ebee4aac22 100644 --- a/drivers/staging/rdma/hfi1/chip.c +++ b/drivers/staging/rdma/hfi1/chip.c @@ -13368,6 +13368,7 @@ static void init_chip(struct hfi1_devdata *dd) */ write_csr(dd, ASIC_QSFP1_OUT, 0x1f); write_csr(dd, ASIC_QSFP2_OUT, 0x1f); + init_chip_resources(dd); } static void init_early_variables(struct hfi1_devdata *dd) @@ -13794,6 +13795,7 @@ void hfi1_start_cleanup(struct hfi1_devdata *dd) free_cntrs(dd); free_rcverr(dd); clean_up_interrupts(dd); + finish_chip_resources(dd); } #define HFI_BASE_GUID(dev) \ diff --git a/drivers/staging/rdma/hfi1/chip.h b/drivers/staging/rdma/hfi1/chip.h index e9a41ed39642..dc684bc11d27 100644 --- a/drivers/staging/rdma/hfi1/chip.h +++ b/drivers/staging/rdma/hfi1/chip.h @@ -639,6 +639,36 @@ int load_firmware(struct hfi1_devdata *dd); void dispose_firmware(void); int acquire_hw_mutex(struct hfi1_devdata *dd); void release_hw_mutex(struct hfi1_devdata *dd); + +/* + * Bitmask of dynamic access for ASIC block chip resources. Each HFI has its + * own range of bits for the resource so it can clear its own bits on + * starting and exiting. If either HFI has the resource bit set, the + * resource is in use. The separate bit ranges are: + * HFI0 bits 7:0 + * HFI1 bits 15:8 + */ +#define CR_SBUS 0x01 /* SBUS, THERM, and PCIE registers */ +#define CR_EPROM 0x02 /* EEP, GPIO registers */ +#define CR_I2C1 0x04 /* QSFP1_OE register */ +#define CR_I2C2 0x08 /* QSFP2_OE register */ +#define CR_DYN_SHIFT 8 /* dynamic flag shift */ +#define CR_DYN_MASK ((1ull << CR_DYN_SHIFT) - 1) + +/* + * Bitmask of static ASIC states these are outside of the dynamic ASIC + * block chip resources above. These are to be set once and never cleared. + * Must be holding the SBus dynamic flag when setting. + */ +#define CR_THERM_INIT 0x010000 + +int acquire_chip_resource(struct hfi1_devdata *dd, u32 resource, u32 mswait); +void release_chip_resource(struct hfi1_devdata *dd, u32 resource); +bool check_chip_resource(struct hfi1_devdata *dd, u32 resource, + const char *func); +void init_chip_resources(struct hfi1_devdata *dd); +void finish_chip_resources(struct hfi1_devdata *dd); + void fabric_serdes_reset(struct hfi1_devdata *dd); int read_8051_data(struct hfi1_devdata *dd, u32 addr, u32 len, u64 *result); diff --git a/drivers/staging/rdma/hfi1/firmware.c b/drivers/staging/rdma/hfi1/firmware.c index ca4e48988b70..140dd8646cd0 100644 --- a/drivers/staging/rdma/hfi1/firmware.c +++ b/drivers/staging/rdma/hfi1/firmware.c @@ -1385,6 +1385,193 @@ void release_hw_mutex(struct hfi1_devdata *dd) write_csr(dd, ASIC_CFG_MUTEX, 0); } +/* return the given resource bit(s) as a mask for the given HFI */ +static inline u64 resource_mask(u32 hfi1_id, u32 resource) +{ + return ((u64)resource) << (hfi1_id ? CR_DYN_SHIFT : 0); +} + +static void fail_mutex_acquire_message(struct hfi1_devdata *dd, + const char *func) +{ + dd_dev_err(dd, + "%s: hardware mutex stuck - suggest rebooting the machine\n", + func); +} + +/* + * Acquire access to a chip resource. + * + * Return 0 on success, -EBUSY if resource busy, -EIO if mutex acquire failed. + */ +static int __acquire_chip_resource(struct hfi1_devdata *dd, u32 resource) +{ + u64 scratch0, all_bits, my_bit; + int ret; + + if (resource & CR_DYN_MASK) { + /* a dynamic resource is in use if either HFI has set the bit */ + all_bits = resource_mask(0, resource) | + resource_mask(1, resource); + my_bit = resource_mask(dd->hfi1_id, resource); + } else { + /* non-dynamic resources are not split between HFIs */ + all_bits = resource; + my_bit = resource; + } + + /* lock against other callers within the driver wanting a resource */ + mutex_lock(&dd->asic_data->asic_resource_mutex); + + ret = acquire_hw_mutex(dd); + if (ret) { + fail_mutex_acquire_message(dd, __func__); + ret = -EIO; + goto done; + } + + scratch0 = read_csr(dd, ASIC_CFG_SCRATCH); + if (scratch0 & all_bits) { + ret = -EBUSY; + } else { + write_csr(dd, ASIC_CFG_SCRATCH, scratch0 | my_bit); + /* force write to be visible to other HFI on another OS */ + (void)read_csr(dd, ASIC_CFG_SCRATCH); + } + + release_hw_mutex(dd); + +done: + mutex_unlock(&dd->asic_data->asic_resource_mutex); + return ret; +} + +/* + * Acquire access to a chip resource, wait up to mswait milliseconds for + * the resource to become available. + * + * Return 0 on success, -EBUSY if busy (even after wait), -EIO if mutex + * acquire failed. + */ +int acquire_chip_resource(struct hfi1_devdata *dd, u32 resource, u32 mswait) +{ + unsigned long timeout; + int ret; + + timeout = jiffies + msecs_to_jiffies(mswait); + while (1) { + ret = __acquire_chip_resource(dd, resource); + if (ret != -EBUSY) + return ret; + /* resource is busy, check our timeout */ + if (time_after_eq(jiffies, timeout)) + return -EBUSY; + usleep_range(80, 120); /* arbitrary delay */ + } +} + +/* + * Release access to a chip resource + */ +void release_chip_resource(struct hfi1_devdata *dd, u32 resource) +{ + u64 scratch0, bit; + + /* only dynamic resources should ever be cleared */ + if (!(resource & CR_DYN_MASK)) { + dd_dev_err(dd, "%s: invalid resource 0x%x\n", __func__, + resource); + return; + } + bit = resource_mask(dd->hfi1_id, resource); + + /* lock against other callers within the driver wanting a resource */ + mutex_lock(&dd->asic_data->asic_resource_mutex); + + if (acquire_hw_mutex(dd)) { + fail_mutex_acquire_message(dd, __func__); + goto done; + } + + scratch0 = read_csr(dd, ASIC_CFG_SCRATCH); + if ((scratch0 & bit) != 0) { + scratch0 &= ~bit; + write_csr(dd, ASIC_CFG_SCRATCH, scratch0); + /* force write to be visible to other HFI on another OS */ + (void)read_csr(dd, ASIC_CFG_SCRATCH); + } else { + dd_dev_warn(dd, "%s: id %d, resource 0x%x: bit not set\n", + __func__, dd->hfi1_id, resource); + } + + release_hw_mutex(dd); + +done: + mutex_unlock(&dd->asic_data->asic_resource_mutex); +} + +/* + * Return true if resource is set, false otherwise. Print a warning + * if not set and a function is supplied. + */ +bool check_chip_resource(struct hfi1_devdata *dd, u32 resource, + const char *func) +{ + u64 scratch0, bit; + + if (resource & CR_DYN_MASK) + bit = resource_mask(dd->hfi1_id, resource); + else + bit = resource; + + scratch0 = read_csr(dd, ASIC_CFG_SCRATCH); + if ((scratch0 & bit) == 0) { + if (func) + dd_dev_warn(dd, + "%s: id %d, resource 0x%x, not acquired!\n", + func, dd->hfi1_id, resource); + return false; + } + return true; +} + +static void clear_chip_resources(struct hfi1_devdata *dd, const char *func) +{ + u64 scratch0; + + /* lock against other callers within the driver wanting a resource */ + mutex_lock(&dd->asic_data->asic_resource_mutex); + + if (acquire_hw_mutex(dd)) { + fail_mutex_acquire_message(dd, func); + goto done; + } + + /* clear all dynamic access bits for this HFI */ + scratch0 = read_csr(dd, ASIC_CFG_SCRATCH); + scratch0 &= ~resource_mask(dd->hfi1_id, CR_DYN_MASK); + write_csr(dd, ASIC_CFG_SCRATCH, scratch0); + /* force write to be visible to other HFI on another OS */ + (void)read_csr(dd, ASIC_CFG_SCRATCH); + + release_hw_mutex(dd); + +done: + mutex_unlock(&dd->asic_data->asic_resource_mutex); +} + +void init_chip_resources(struct hfi1_devdata *dd) +{ + /* clear any holds left by us */ + clear_chip_resources(dd, __func__); +} + +void finish_chip_resources(struct hfi1_devdata *dd) +{ + /* clear any holds left by us */ + clear_chip_resources(dd, __func__); +} + void set_sbus_fast_mode(struct hfi1_devdata *dd) { write_csr(dd, ASIC_CFG_SBUS_EXECUTE, |