MSI-X is never well-tested, might contain bugs and generally isn't
really all that useful to maintain. Also ath10k is mainly used with
shared/singly-MSI interrupt systems. Hence removing MSI range support.
This change will be useful for further cleanup in copy engine lock
and to add NAPI support.
Signed-off-by: Rajkumar Manoharan <[email protected]>
---
drivers/net/wireless/ath/ath10k/pci.c | 158 ++++------------------------------
drivers/net/wireless/ath/ath10k/pci.h | 11 +--
2 files changed, 18 insertions(+), 151 deletions(-)
diff --git a/drivers/net/wireless/ath/ath10k/pci.c b/drivers/net/wireless/ath/ath10k/pci.c
index 0b305ef..3dc111f 100644
--- a/drivers/net/wireless/ath/ath10k/pci.c
+++ b/drivers/net/wireless/ath/ath10k/pci.c
@@ -745,10 +745,7 @@ static inline const char *ath10k_pci_get_irq_method(struct ath10k *ar)
{
struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
- if (ar_pci->num_msi_intrs > 1)
- return "msi-x";
-
- if (ar_pci->num_msi_intrs == 1)
+ if (ar_pci->oper_irq_mode == ATH10K_PCI_IRQ_MSI)
return "msi";
return "legacy";
@@ -1502,13 +1499,8 @@ void ath10k_pci_hif_send_complete_check(struct ath10k *ar, u8 pipe,
void ath10k_pci_kill_tasklet(struct ath10k *ar)
{
struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
- int i;
tasklet_kill(&ar_pci->intr_tq);
- tasklet_kill(&ar_pci->msi_fw_err);
-
- for (i = 0; i < CE_COUNT; i++)
- tasklet_kill(&ar_pci->pipe_info[i].intr);
del_timer_sync(&ar_pci->rx_post_retry);
}
@@ -1624,10 +1616,8 @@ static void ath10k_pci_irq_disable(struct ath10k *ar)
static void ath10k_pci_irq_sync(struct ath10k *ar)
{
struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
- int i;
- for (i = 0; i < max(1, ar_pci->num_msi_intrs); i++)
- synchronize_irq(ar_pci->pdev->irq + i);
+ synchronize_irq(ar_pci->pdev->irq);
}
static void ath10k_pci_irq_enable(struct ath10k *ar)
@@ -2596,65 +2586,6 @@ static const struct ath10k_hif_ops ath10k_pci_hif_ops = {
#endif
};
-static void ath10k_pci_ce_tasklet(unsigned long ptr)
-{
- struct ath10k_pci_pipe *pipe = (struct ath10k_pci_pipe *)ptr;
- struct ath10k_pci *ar_pci = pipe->ar_pci;
-
- ath10k_ce_per_engine_service(ar_pci->ar, pipe->pipe_num);
-}
-
-static void ath10k_msi_err_tasklet(unsigned long data)
-{
- struct ath10k *ar = (struct ath10k *)data;
-
- if (!ath10k_pci_has_fw_crashed(ar)) {
- ath10k_warn(ar, "received unsolicited fw crash interrupt\n");
- return;
- }
-
- ath10k_pci_irq_disable(ar);
- ath10k_pci_fw_crashed_clear(ar);
- ath10k_pci_fw_crashed_dump(ar);
-}
-
-/*
- * Handler for a per-engine interrupt on a PARTICULAR CE.
- * This is used in cases where each CE has a private MSI interrupt.
- */
-static irqreturn_t ath10k_pci_per_engine_handler(int irq, void *arg)
-{
- struct ath10k *ar = arg;
- struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
- int ce_id = irq - ar_pci->pdev->irq - MSI_ASSIGN_CE_INITIAL;
-
- if (ce_id < 0 || ce_id >= ARRAY_SIZE(ar_pci->pipe_info)) {
- ath10k_warn(ar, "unexpected/invalid irq %d ce_id %d\n", irq,
- ce_id);
- return IRQ_HANDLED;
- }
-
- /*
- * NOTE: We are able to derive ce_id from irq because we
- * use a one-to-one mapping for CE's 0..5.
- * CE's 6 & 7 do not use interrupts at all.
- *
- * This mapping must be kept in sync with the mapping
- * used by firmware.
- */
- tasklet_schedule(&ar_pci->pipe_info[ce_id].intr);
- return IRQ_HANDLED;
-}
-
-static irqreturn_t ath10k_pci_msi_fw_handler(int irq, void *arg)
-{
- struct ath10k *ar = arg;
- struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
-
- tasklet_schedule(&ar_pci->msi_fw_err);
- return IRQ_HANDLED;
-}
-
/*
* Top-level interrupt handler for all PCI interrupts from a Target.
* When a block of MSI interrupts is allocated, this top-level handler
@@ -2672,7 +2603,7 @@ static irqreturn_t ath10k_pci_interrupt_handler(int irq, void *arg)
return IRQ_NONE;
}
- if (ar_pci->num_msi_intrs == 0) {
+ if (ar_pci->oper_irq_mode == ATH10K_PCI_IRQ_LEGACY) {
if (!ath10k_pci_irq_pending(ar))
return IRQ_NONE;
@@ -2699,43 +2630,10 @@ static void ath10k_pci_tasklet(unsigned long data)
ath10k_ce_per_engine_service_any(ar);
/* Re-enable legacy irq that was disabled in the irq handler */
- if (ar_pci->num_msi_intrs == 0)
+ if (ar_pci->oper_irq_mode == ATH10K_PCI_IRQ_LEGACY)
ath10k_pci_enable_legacy_irq(ar);
}
-static int ath10k_pci_request_irq_msix(struct ath10k *ar)
-{
- struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
- int ret, i;
-
- ret = request_irq(ar_pci->pdev->irq + MSI_ASSIGN_FW,
- ath10k_pci_msi_fw_handler,
- IRQF_SHARED, "ath10k_pci", ar);
- if (ret) {
- ath10k_warn(ar, "failed to request MSI-X fw irq %d: %d\n",
- ar_pci->pdev->irq + MSI_ASSIGN_FW, ret);
- return ret;
- }
-
- for (i = MSI_ASSIGN_CE_INITIAL; i <= MSI_ASSIGN_CE_MAX; i++) {
- ret = request_irq(ar_pci->pdev->irq + i,
- ath10k_pci_per_engine_handler,
- IRQF_SHARED, "ath10k_pci", ar);
- if (ret) {
- ath10k_warn(ar, "failed to request MSI-X ce irq %d: %d\n",
- ar_pci->pdev->irq + i, ret);
-
- for (i--; i >= MSI_ASSIGN_CE_INITIAL; i--)
- free_irq(ar_pci->pdev->irq + i, ar);
-
- free_irq(ar_pci->pdev->irq + MSI_ASSIGN_FW, ar);
- return ret;
- }
- }
-
- return 0;
-}
-
static int ath10k_pci_request_irq_msi(struct ath10k *ar)
{
struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
@@ -2774,41 +2672,28 @@ static int ath10k_pci_request_irq(struct ath10k *ar)
{
struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
- switch (ar_pci->num_msi_intrs) {
- case 0:
+ switch (ar_pci->oper_irq_mode) {
+ case ATH10K_PCI_IRQ_LEGACY:
return ath10k_pci_request_irq_legacy(ar);
- case 1:
+ case ATH10K_PCI_IRQ_MSI:
return ath10k_pci_request_irq_msi(ar);
default:
- return ath10k_pci_request_irq_msix(ar);
+ return -EINVAL;
}
}
static void ath10k_pci_free_irq(struct ath10k *ar)
{
struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
- int i;
- /* There's at least one interrupt irregardless whether its legacy INTR
- * or MSI or MSI-X */
- for (i = 0; i < max(1, ar_pci->num_msi_intrs); i++)
- free_irq(ar_pci->pdev->irq + i, ar);
+ free_irq(ar_pci->pdev->irq, ar);
}
void ath10k_pci_init_irq_tasklets(struct ath10k *ar)
{
struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
- int i;
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);
-
- for (i = 0; i < CE_COUNT; i++) {
- ar_pci->pipe_info[i].ar_pci = ar_pci;
- tasklet_init(&ar_pci->pipe_info[i].intr, ath10k_pci_ce_tasklet,
- (unsigned long)&ar_pci->pipe_info[i]);
- }
}
static int ath10k_pci_init_irq(struct ath10k *ar)
@@ -2822,20 +2707,9 @@ static int ath10k_pci_init_irq(struct ath10k *ar)
ath10k_info(ar, "limiting irq mode to: %d\n",
ath10k_pci_irq_mode);
- /* Try MSI-X */
- if (ath10k_pci_irq_mode == ATH10K_PCI_IRQ_AUTO) {
- ar_pci->num_msi_intrs = MSI_ASSIGN_CE_MAX + 1;
- ret = pci_enable_msi_range(ar_pci->pdev, ar_pci->num_msi_intrs,
- ar_pci->num_msi_intrs);
- if (ret > 0)
- return 0;
-
- /* fall-through */
- }
-
/* Try MSI */
if (ath10k_pci_irq_mode != ATH10K_PCI_IRQ_LEGACY) {
- ar_pci->num_msi_intrs = 1;
+ ar_pci->oper_irq_mode = ATH10K_PCI_IRQ_MSI;
ret = pci_enable_msi(ar_pci->pdev);
if (ret == 0)
return 0;
@@ -2851,7 +2725,7 @@ static int ath10k_pci_init_irq(struct ath10k *ar)
* This write might get lost if target has NOT written BAR.
* For now, fix the race by repeating the write in below
* synchronization checking. */
- ar_pci->num_msi_intrs = 0;
+ ar_pci->oper_irq_mode = ATH10K_PCI_IRQ_LEGACY;
ath10k_pci_write32(ar, SOC_CORE_BASE_ADDRESS + PCIE_INTR_ENABLE_ADDRESS,
PCIE_INTR_FIRMWARE_MASK | PCIE_INTR_CE_MASK_ALL);
@@ -2869,8 +2743,8 @@ static int ath10k_pci_deinit_irq(struct ath10k *ar)
{
struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
- switch (ar_pci->num_msi_intrs) {
- case 0:
+ switch (ar_pci->oper_irq_mode) {
+ case ATH10K_PCI_IRQ_LEGACY:
ath10k_pci_deinit_irq_legacy(ar);
break;
default:
@@ -2908,7 +2782,7 @@ int ath10k_pci_wait_for_target_init(struct ath10k *ar)
if (val & FW_IND_INITIALIZED)
break;
- if (ar_pci->num_msi_intrs == 0)
+ if (ar_pci->oper_irq_mode == ATH10K_PCI_IRQ_LEGACY)
/* Fix potential race by repeating CORE_BASE writes */
ath10k_pci_enable_legacy_irq(ar);
@@ -3186,8 +3060,8 @@ static int ath10k_pci_probe(struct pci_dev *pdev,
goto err_sleep;
}
- ath10k_info(ar, "pci irq %s interrupts %d irq_mode %d reset_mode %d\n",
- ath10k_pci_get_irq_method(ar), ar_pci->num_msi_intrs,
+ ath10k_info(ar, "pci irq %s oper_irq_mode %d irq_mode %d reset_mode %d\n",
+ ath10k_pci_get_irq_method(ar), ar_pci->oper_irq_mode,
ath10k_pci_irq_mode, ath10k_pci_reset_mode);
ret = ath10k_pci_request_irq(ar);
diff --git a/drivers/net/wireless/ath/ath10k/pci.h b/drivers/net/wireless/ath/ath10k/pci.h
index 249c73a..d12fe70 100644
--- a/drivers/net/wireless/ath/ath10k/pci.h
+++ b/drivers/net/wireless/ath/ath10k/pci.h
@@ -148,9 +148,6 @@ struct ath10k_pci_pipe {
/* protects compl_free and num_send_allowed */
spinlock_t pipe_lock;
-
- struct ath10k_pci *ar_pci;
- struct tasklet_struct intr;
};
struct ath10k_pci_supp_chip {
@@ -171,14 +168,10 @@ struct ath10k_pci {
void __iomem *mem;
size_t mem_len;
- /*
- * Number of MSI interrupts granted, 0 --> using legacy PCI line
- * interrupts.
- */
- int num_msi_intrs;
+ /* Operating interrupt mode */
+ u8 oper_irq_mode;
struct tasklet_struct intr_tq;
- struct tasklet_struct msi_fw_err;
struct ath10k_pci_pipe pipe_info[CE_COUNT_MAX];
--
2.7.4
Rajkumar Manoharan <[email protected]> writes:
> MSI-X is never well-tested, might contain bugs and generally isn't
> really all that useful to maintain. Also ath10k is mainly used with
> shared/singly-MSI interrupt systems. Hence removing MSI range support.
> This change will be useful for further cleanup in copy engine lock
> and to add NAPI support.
>
> Signed-off-by: Rajkumar Manoharan <[email protected]>
[...]
> @@ -171,14 +168,10 @@ struct ath10k_pci {
> void __iomem *mem;
> size_t mem_len;
>
> - /*
> - * Number of MSI interrupts granted, 0 --> using legacy PCI line
> - * interrupts.
> - */
> - int num_msi_intrs;
> + /* Operating interrupt mode */
> + u8 oper_irq_mode;
Shouldn't this be enum ath10k_pci_irq_mode?
--
Kalle Valo
On 2016-04-05 18:21, Valo, Kalle wrote:
> Rajkumar Manoharan <[email protected]> writes:
>
>> MSI-X is never well-tested, might contain bugs and generally isn't
>> really all that useful to maintain. Also ath10k is mainly used with
>> shared/singly-MSI interrupt systems. Hence removing MSI range support.
>> This change will be useful for further cleanup in copy engine lock
>> and to add NAPI support.
>>
>> Signed-off-by: Rajkumar Manoharan <[email protected]>
>
> [...]
>
>> @@ -171,14 +168,10 @@ struct ath10k_pci {
>> void __iomem *mem;
>> size_t mem_len;
>>
>> - /*
>> - * Number of MSI interrupts granted, 0 --> using legacy PCI line
>> - * interrupts.
>> - */
>> - int num_msi_intrs;
>> + /* Operating interrupt mode */
>> + u8 oper_irq_mode;
>
> Shouldn't this be enum ath10k_pci_irq_mode?
Yes.. Then the enum should be moved to pci.h. will send next version
-Rajkumar