diff options
Diffstat (limited to 'drivers/dma/idxd/device.c')
| -rw-r--r-- | drivers/dma/idxd/device.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/drivers/dma/idxd/device.c b/drivers/dma/idxd/device.c index 5cf419fe6b46..c2cdf41b6e57 100644 --- a/drivers/dma/idxd/device.c +++ b/drivers/dma/idxd/device.c @@ -16,6 +16,7 @@ static void idxd_cmd_exec(struct idxd_device *idxd, int cmd_code, u32 operand, u32 *status); static void idxd_device_wqs_clear_state(struct idxd_device *idxd); static void idxd_wq_disable_cleanup(struct idxd_wq *wq); +static int idxd_wq_config_write(struct idxd_wq *wq); /* Interrupt control bits */ void idxd_unmask_error_interrupts(struct idxd_device *idxd) @@ -215,14 +216,28 @@ int idxd_wq_disable(struct idxd_wq *wq, bool reset_config) return 0; } + /* + * Disable WQ does not drain address translations, if WQ attributes are + * changed before translations are drained, pending translations can + * be issued using updated WQ attibutes, resulting in invalid + * translations being cached in the device translation cache. + * + * To make sure pending translations are drained before WQ + * attributes are changed, we use a WQ Drain followed by WQ Reset and + * then restore the WQ configuration. + */ + idxd_wq_drain(wq); + operand = BIT(wq->id % 16) | ((wq->id / 16) << 16); - idxd_cmd_exec(idxd, IDXD_CMD_DISABLE_WQ, operand, &status); + idxd_cmd_exec(idxd, IDXD_CMD_RESET_WQ, operand, &status); if (status != IDXD_CMDSTS_SUCCESS) { - dev_dbg(dev, "WQ disable failed: %#x\n", status); + dev_dbg(dev, "WQ reset failed: %#x\n", status); return -ENXIO; } + idxd_wq_config_write(wq); + if (reset_config) idxd_wq_disable_cleanup(wq); clear_bit(wq->id, idxd->wq_enable_map); |