@@ -6381,18 +6381,17 @@ static void lcb_shutdown(struct hfi1_devdata *dd, int abort)
*
* The expectation is that the caller of this routine would have taken
* care of properly transitioning the link into the correct state.
+ * NOTE: the caller needs to acquire the dd->dc8051_lock lock
+ * before calling this function.
*/
-static void dc_shutdown(struct hfi1_devdata *dd)
+static void _dc_shutdown(struct hfi1_devdata *dd)
{
- unsigned long flags;
+ lockdep_assert_held(&dd->dc8051_lock);
- spin_lock_irqsave(&dd->dc8051_lock, flags);
- if (dd->dc_shutdown) {
- spin_unlock_irqrestore(&dd->dc8051_lock, flags);
+ if (dd->dc_shutdown)
return;
- }
+
dd->dc_shutdown = 1;
- spin_unlock_irqrestore(&dd->dc8051_lock, flags);
/* Shutdown the LCB */
lcb_shutdown(dd, 1);
/*
@@ -6403,35 +6402,45 @@ static void dc_shutdown(struct hfi1_devdata *dd)
write_csr(dd, DC_DC8051_CFG_RST, 0x1);
}
+static void dc_shutdown(struct hfi1_devdata *dd)
+{
+ mutex_lock(&dd->dc8051_lock);
+ _dc_shutdown(dd);
+ mutex_unlock(&dd->dc8051_lock);
+}
+
/*
* Calling this after the DC has been brought out of reset should not
* do any damage.
+ * NOTE: the caller needs to acquire the dd->dc8051_lock lock
+ * before calling this function.
*/
-static void dc_start(struct hfi1_devdata *dd)
+static void _dc_start(struct hfi1_devdata *dd)
{
- unsigned long flags;
- int ret;
+ lockdep_assert_held(&dd->dc8051_lock);
- spin_lock_irqsave(&dd->dc8051_lock, flags);
if (!dd->dc_shutdown)
- goto done;
- spin_unlock_irqrestore(&dd->dc8051_lock, flags);
+ return;
+
/* Take the 8051 out of reset */
write_csr(dd, DC_DC8051_CFG_RST, 0ull);
/* Wait until 8051 is ready */
- ret = wait_fm_ready(dd, TIMEOUT_8051_START);
- if (ret) {
+ if (wait_fm_ready(dd, TIMEOUT_8051_START))
dd_dev_err(dd, "%s: timeout starting 8051 firmware\n",
__func__);
- }
+
/* Take away reset for LCB and RX FPE (set in lcb_shutdown). */
write_csr(dd, DCC_CFG_RESET, 0x10);
/* lcb_shutdown() with abort=1 does not restore these */
write_csr(dd, DC_LCB_ERR_EN, dd->lcb_err_en);
- spin_lock_irqsave(&dd->dc8051_lock, flags);
dd->dc_shutdown = 0;
-done:
- spin_unlock_irqrestore(&dd->dc8051_lock, flags);
+}
+
+static void dc_start(struct hfi1_devdata *dd)
+{
+ mutex_lock(&dd->dc8051_lock);
+ _dc_start(dd);
+ mutex_unlock(&dd->dc8051_lock);
}
/*
@@ -8475,16 +8484,11 @@ static int do_8051_command(
{
u64 reg, completed;
int return_code;
- unsigned long flags;
unsigned long timeout;
hfi1_cdbg(DC8051, "type %d, data 0x%012llx", type, in_data);
- /*
- * Alternative to holding the lock for a long time:
- * - keep busy wait - have other users bounce off
- */
- spin_lock_irqsave(&dd->dc8051_lock, flags);
+ mutex_lock(&dd->dc8051_lock);
/* We can't send any commands to the 8051 if it's in reset */
if (dd->dc_shutdown) {
@@ -8510,10 +8514,8 @@ static int do_8051_command(
return_code = -ENXIO;
goto fail;
}
- spin_unlock_irqrestore(&dd->dc8051_lock, flags);
- dc_shutdown(dd);
- dc_start(dd);
- spin_lock_irqsave(&dd->dc8051_lock, flags);
+ _dc_shutdown(dd);
+ _dc_start(dd);
}
/*
@@ -8594,8 +8596,7 @@ static int do_8051_command(
write_csr(dd, DC_DC8051_CFG_HOST_CMD_0, 0);
fail:
- spin_unlock_irqrestore(&dd->dc8051_lock, flags);
-
+ mutex_unlock(&dd->dc8051_lock);
return return_code;
}
@@ -926,8 +926,7 @@ struct hfi1_devdata {
spinlock_t rcvctrl_lock; /* protect changes to RcvCtrl */
/* around rcd and (user ctxts) ctxt_cnt use (intr vs free) */
spinlock_t uctxt_lock; /* rcd and user context changes */
- /* exclusive access to 8051 */
- spinlock_t dc8051_lock;
+ struct mutex dc8051_lock; /* exclusive access to 8051 */
/* exclusive access to 8051 memory */
spinlock_t dc8051_memlock;
int dc8051_timed_out; /* remember if the 8051 timed out */
@@ -1078,11 +1078,11 @@ struct hfi1_devdata *hfi1_alloc_devdata(struct pci_dev *pdev, size_t extra)
spin_lock_init(&dd->uctxt_lock);
spin_lock_init(&dd->hfi1_diag_trans_lock);
spin_lock_init(&dd->sc_init_lock);
- spin_lock_init(&dd->dc8051_lock);
spin_lock_init(&dd->dc8051_memlock);
seqlock_init(&dd->sc2vl_lock);
spin_lock_init(&dd->sde_map_lock);
spin_lock_init(&dd->pio_map_lock);
+ mutex_init(&dd->dc8051_lock);
init_waitqueue_head(&dd->event_queue);
dd->int_counter = alloc_percpu(u64);