| #include "fbnic.h" |
| |
| u64 fbnic_stat_rd64(struct fbnic_dev *fbd, u32 reg, u32 offset) |
| { |
| u32 prev_upper, upper, lower, diff; |
| |
| prev_upper = rd32(fbd, reg + offset); |
| lower = rd32(fbd, reg); |
| upper = rd32(fbd, reg + offset); |
| |
| diff = upper - prev_upper; |
| if (!diff) |
| return ((u64)upper << 32) | lower; |
| |
| if (diff > 1) |
| dev_warn_once(fbd->dev, |
| "Stats inconsistent, upper 32b of %#010x updating too quickly\n", |
| reg * 4); |
| |
| /* Return only the upper bits as we cannot guarantee |
| * the accuracy of the lower bits. We will add them in |
| * when the counter slows down enough that we can get |
| * a snapshot with both upper values being the same |
| * between reads. |
| */ |
| return ((u64)upper << 32); |
| } |
