[PATCH v2 6/6] ath10k: remove early irq handling
Michal Kazior
michal.kazior at tieto.com
Fri Aug 22 05:23:34 PDT 2014
It's not really necessary to have a dedicated irq
handler just for the sake of catching early fw
crashes anymore. It is now safe to use one handler
even during early stages of device boot up.
Signed-off-by: Michal Kazior <michal.kazior at tieto.com>
---
Notes:
v2:
* remove early_tasket_struct [Kalle]
* s/ath10k_pci_fw_crashed/ath10k_pci_has_fw_crashed [Kalle]
* perform warm reset before initializing irq
drivers/net/wireless/ath/ath10k/pci.c | 172 ++++++++++------------------------
drivers/net/wireless/ath/ath10k/pci.h | 1 -
2 files changed, 48 insertions(+), 125 deletions(-)
diff --git a/drivers/net/wireless/ath/ath10k/pci.c b/drivers/net/wireless/ath/ath10k/pci.c
index 6224952..ffb980c 100644
--- a/drivers/net/wireless/ath/ath10k/pci.c
+++ b/drivers/net/wireless/ath/ath10k/pci.c
@@ -266,46 +266,6 @@ static void ath10k_pci_enable_legacy_irq(struct ath10k *ar)
PCIE_INTR_ENABLE_ADDRESS);
}
-static irqreturn_t ath10k_pci_early_irq_handler(int irq, void *arg)
-{
- struct ath10k *ar = arg;
- struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
-
- if (ar_pci->num_msi_intrs == 0) {
- if (!ath10k_pci_irq_pending(ar))
- return IRQ_NONE;
-
- ath10k_pci_disable_and_clear_legacy_irq(ar);
- }
-
- tasklet_schedule(&ar_pci->early_irq_tasklet);
-
- return IRQ_HANDLED;
-}
-
-static int ath10k_pci_request_early_irq(struct ath10k *ar)
-{
- struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
- int ret;
-
- /* Regardless whether MSI-X/MSI/legacy irqs have been set up the first
- * interrupt from irq vector is triggered in all cases for FW
- * indication/errors */
- ret = request_irq(ar_pci->pdev->irq, ath10k_pci_early_irq_handler,
- IRQF_SHARED, "ath10k_pci (early)", ar);
- if (ret) {
- ath10k_warn("failed to request early irq: %d\n", ret);
- return ret;
- }
-
- return 0;
-}
-
-static void ath10k_pci_free_early_irq(struct ath10k *ar)
-{
- free_irq(ath10k_pci_priv(ar)->pdev->irq, ar);
-}
-
static inline const char *ath10k_pci_get_irq_method(struct ath10k *ar)
{
struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
@@ -948,7 +908,6 @@ static void ath10k_pci_kill_tasklet(struct ath10k *ar)
tasklet_kill(&ar_pci->intr_tq);
tasklet_kill(&ar_pci->msi_fw_err);
- tasklet_kill(&ar_pci->early_irq_tasklet);
for (i = 0; i < CE_COUNT; i++)
tasklet_kill(&ar_pci->pipe_info[i].intr);
@@ -1158,20 +1117,10 @@ static void ath10k_pci_irq_enable(struct ath10k *ar)
static int ath10k_pci_hif_start(struct ath10k *ar)
{
struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
- int ret, ret_early;
+ int ret;
ath10k_dbg(ATH10K_DBG_BOOT, "boot hif start\n");
- ath10k_pci_free_early_irq(ar);
- ath10k_pci_kill_tasklet(ar);
-
- ret = ath10k_pci_request_irq(ar);
- if (ret) {
- ath10k_warn("failed to post RX buffers for all pipes: %d\n",
- ret);
- goto err_early_irq;
- }
-
ath10k_pci_irq_enable(ar);
/* Post buffers once to start things off. */
@@ -1187,15 +1136,7 @@ static int ath10k_pci_hif_start(struct ath10k *ar)
err_stop:
ath10k_pci_irq_disable(ar);
- ath10k_pci_free_irq(ar);
ath10k_pci_kill_tasklet(ar);
-err_early_irq:
- /* Though there should be no interrupts (device was reset)
- * power_down() expects the early IRQ to be installed as per the
- * driver lifecycle. */
- ret_early = ath10k_pci_request_early_irq(ar);
- if (ret_early)
- ath10k_warn("failed to re-enable early irq: %d\n", ret_early);
return ret;
}
@@ -1302,7 +1243,6 @@ static void ath10k_pci_ce_deinit(struct ath10k *ar)
static void ath10k_pci_hif_stop(struct ath10k *ar)
{
struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
- int ret;
ath10k_dbg(ATH10K_DBG_BOOT, "boot hif stop\n");
@@ -1310,17 +1250,7 @@ static void ath10k_pci_hif_stop(struct ath10k *ar)
return;
ath10k_pci_irq_disable(ar);
- ath10k_pci_free_irq(ar);
ath10k_pci_kill_tasklet(ar);
-
- ret = ath10k_pci_request_early_irq(ar);
- if (ret)
- ath10k_warn("failed to re-enable early irq: %d\n", ret);
-
- /* At this point, asynchronous threads are stopped, the target should
- * not DMA nor interrupt. We process the leftovers and then free
- * everything else up. */
-
ath10k_pci_buffer_cleanup(ar);
/* Make the sure the device won't access any structures on the host by
@@ -1806,28 +1736,19 @@ static int ath10k_pci_ce_init(struct ath10k *ar)
return 0;
}
-static void ath10k_pci_fw_interrupt_handler(struct ath10k *ar)
+static bool ath10k_pci_has_fw_crashed(struct ath10k *ar)
{
- struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
- u32 fw_indicator;
-
- fw_indicator = ath10k_pci_read32(ar, FW_INDICATOR_ADDRESS);
+ return ath10k_pci_read32(ar, FW_INDICATOR_ADDRESS) &
+ FW_IND_EVENT_PENDING;
+}
- if (fw_indicator & FW_IND_EVENT_PENDING) {
- /* ACK: clear Target-side pending event */
- ath10k_pci_write32(ar, FW_INDICATOR_ADDRESS,
- fw_indicator & ~FW_IND_EVENT_PENDING);
+static void ath10k_pci_fw_crashed_clear(struct ath10k *ar)
+{
+ u32 val;
- if (ar_pci->started) {
- ath10k_pci_fw_crashed_dump(ar);
- } else {
- /*
- * Probable Target failure before we're prepared
- * to handle it. Generally unexpected.
- */
- ath10k_warn("early firmware event indicated\n");
- }
- }
+ val = ath10k_pci_read32(ar, FW_INDICATOR_ADDRESS);
+ val &= ~FW_IND_EVENT_PENDING;
+ ath10k_pci_write32(ar, FW_INDICATOR_ADDRESS, val);
}
/* this function effectively clears target memory controller assert line */
@@ -1960,34 +1881,26 @@ static int __ath10k_pci_hif_power_up(struct ath10k *ar, bool cold_reset)
goto err;
}
- ret = ath10k_pci_request_early_irq(ar);
- if (ret) {
- ath10k_err("failed to request early irq: %d\n", ret);
- goto err_ce;
- }
-
ret = ath10k_pci_wait_for_target_init(ar);
if (ret) {
ath10k_err("failed to wait for target to init: %d\n", ret);
- goto err_free_early_irq;
+ goto err_ce;
}
ret = ath10k_pci_init_config(ar);
if (ret) {
ath10k_err("failed to setup init config: %d\n", ret);
- goto err_free_early_irq;
+ goto err_ce;
}
ret = ath10k_pci_wake_target_cpu(ar);
if (ret) {
ath10k_err("could not wake up target CPU: %d\n", ret);
- goto err_free_early_irq;
+ goto err_ce;
}
return 0;
-err_free_early_irq:
- ath10k_pci_free_early_irq(ar);
err_ce:
ath10k_pci_ce_deinit(ar);
ath10k_pci_warm_reset(ar);
@@ -2056,8 +1969,6 @@ static void ath10k_pci_hif_power_down(struct ath10k *ar)
{
ath10k_dbg(ATH10K_DBG_BOOT, "boot hif power down\n");
- ath10k_pci_free_early_irq(ar);
- ath10k_pci_kill_tasklet(ar);
ath10k_pci_warm_reset(ar);
}
@@ -2140,7 +2051,13 @@ static void ath10k_msi_err_tasklet(unsigned long data)
{
struct ath10k *ar = (struct ath10k *)data;
- ath10k_pci_fw_interrupt_handler(ar);
+ if (!ath10k_pci_has_fw_crashed(ar)) {
+ ath10k_warn("received unsolicited fw crash interrupt\n");
+ return;
+ }
+
+ ath10k_pci_fw_crashed_clear(ar);
+ ath10k_pci_fw_crashed_dump(ar);
}
/*
@@ -2201,27 +2118,17 @@ static irqreturn_t ath10k_pci_interrupt_handler(int irq, void *arg)
return IRQ_HANDLED;
}
-static void ath10k_pci_early_irq_tasklet(unsigned long data)
+static void ath10k_pci_tasklet(unsigned long data)
{
struct ath10k *ar = (struct ath10k *)data;
- u32 fw_ind;
+ struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
- fw_ind = ath10k_pci_read32(ar, FW_INDICATOR_ADDRESS);
- if (fw_ind & FW_IND_EVENT_PENDING) {
- ath10k_pci_write32(ar, FW_INDICATOR_ADDRESS,
- fw_ind & ~FW_IND_EVENT_PENDING);
+ if (ath10k_pci_has_fw_crashed(ar)) {
+ ath10k_pci_fw_crashed_clear(ar);
ath10k_pci_fw_crashed_dump(ar);
+ return;
}
- ath10k_pci_enable_legacy_irq(ar);
-}
-
-static void ath10k_pci_tasklet(unsigned long data)
-{
- struct ath10k *ar = (struct ath10k *)data;
- struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
-
- ath10k_pci_fw_interrupt_handler(ar); /* FIXME: Handle FW error */
ath10k_ce_per_engine_service_any(ar);
/* Re-enable legacy irq that was disabled in the irq handler */
@@ -2332,8 +2239,6 @@ static void ath10k_pci_init_irq_tasklets(struct ath10k *ar)
tasklet_init(&ar_pci->intr_tq, ath10k_pci_tasklet, (unsigned long)ar);
tasklet_init(&ar_pci->msi_fw_err, ath10k_msi_err_tasklet,
(unsigned long)ar);
- tasklet_init(&ar_pci->early_irq_tasklet, ath10k_pci_early_irq_tasklet,
- (unsigned long)ar);
for (i = 0; i < CE_COUNT; i++) {
ar_pci->pipe_info[i].ar_pci = ar_pci;
@@ -2459,8 +2364,7 @@ static int ath10k_pci_wait_for_target_init(struct ath10k *ar)
if (val & FW_IND_EVENT_PENDING) {
ath10k_warn("device has crashed during init\n");
- ath10k_pci_write32(ar, FW_INDICATOR_ADDRESS,
- val & ~FW_IND_EVENT_PENDING);
+ ath10k_pci_fw_crashed_clear(ar);
ath10k_pci_fw_crashed_dump(ar);
return -ECOMM;
}
@@ -2643,6 +2547,13 @@ static int ath10k_pci_probe(struct pci_dev *pdev,
goto err_free_ce;
}
+ /* Workaround: There's no known way to mask all possible interrupts via
+ * device CSR. The only way to make sure device doesn't assert
+ * interrupts is to reset it. Interrupts are then disabled on host
+ * after handlers are registered.
+ */
+ ath10k_pci_warm_reset(ar);
+
ret = ath10k_pci_init_irq(ar);
if (ret) {
ath10k_err("failed to init irqs: %d\n", ret);
@@ -2653,14 +2564,26 @@ static int ath10k_pci_probe(struct pci_dev *pdev,
ath10k_pci_get_irq_method(ar), ar_pci->num_msi_intrs,
ath10k_pci_irq_mode, ath10k_pci_reset_mode);
+ ret = ath10k_pci_request_irq(ar);
+ if (ret) {
+ ath10k_warn("failed to request irqs: %d\n", ret);
+ goto err_deinit_irq;
+ }
+
+ /* This shouldn't race as the device has been reset above. */
+ ath10k_pci_irq_disable(ar);
+
ret = ath10k_core_register(ar, chip_id);
if (ret) {
ath10k_err("failed to register driver core: %d\n", ret);
- goto err_deinit_irq;
+ goto err_free_irq;
}
return 0;
+err_free_irq:
+ ath10k_pci_free_irq(ar);
+
err_deinit_irq:
ath10k_pci_deinit_irq(ar);
@@ -2695,6 +2618,7 @@ static void ath10k_pci_remove(struct pci_dev *pdev)
return;
ath10k_core_unregister(ar);
+ ath10k_pci_free_irq(ar);
ath10k_pci_deinit_irq(ar);
ath10k_pci_ce_deinit(ar);
ath10k_pci_free_ce(ar);
diff --git a/drivers/net/wireless/ath/ath10k/pci.h b/drivers/net/wireless/ath/ath10k/pci.h
index 294a72e..caed918 100644
--- a/drivers/net/wireless/ath/ath10k/pci.h
+++ b/drivers/net/wireless/ath/ath10k/pci.h
@@ -166,7 +166,6 @@ struct ath10k_pci {
struct tasklet_struct intr_tq;
struct tasklet_struct msi_fw_err;
- struct tasklet_struct early_irq_tasklet;
int started;
--
1.8.5.3
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