On 26/07/2019 10:15, Steven Price wrote:
On 25/07/2019 22:11, Rob Herring wrote:
On Thu, Jul 25, 2019 at 7:08 AM Robin Murphy <robin.mur...@arm.com>
wrote:
Hi Rob,
On 25/07/2019 02:10, Rob Herring wrote:
[...]
@@ -328,6 +427,18 @@ static irqreturn_t panfrost_mmu_irq_handler(int
irq, void *data)
access_type = (fault_status >> 8) & 0x3;
source_id = (fault_status >> 16);
+ /* Page fault only */
+ if ((status & mask) == BIT(i)) {
+ WARN_ON(exception_type < 0xC1 ||
exception_type > 0xC4);
+
+ ret = panfrost_mmu_map_fault_addr(pfdev, i,
addr);
+ if (!ret) {
+ mmu_write(pfdev, MMU_INT_CLEAR, BIT(i));
+ status &= ~mask;
+ continue;
+ }
+ }
+
/* terminal fault, print info about the fault */
dev_err(pfdev->dev,
"Unhandled Page fault in AS%d at VA 0x%016llX\n"
@@ -368,8 +479,9 @@ int panfrost_mmu_init(struct panfrost_device
*pfdev)
if (irq <= 0)
return -ENODEV;
- err = devm_request_irq(pfdev->dev, irq, panfrost_mmu_irq_handler,
- IRQF_SHARED, "mmu", pfdev);
+ err = devm_request_threaded_irq(pfdev->dev, irq, NULL,
+ panfrost_mmu_irq_handler,
+ IRQF_ONESHOT, "mmu", pfdev);
The change of flags here breaks platforms using a single shared
interrupt line.
Do they exist? I think this was largely copy-n-paste leftover from the
Good question - of the platforms I know about they all have separate
IRQs, but kbase does explicitly allow shared interrupts so it's quite
possible there is a platform out there which does.
lima driver where utgard has a bunch of irqs and so they get combined.
While it's possible certainly, I'd like to avoid having to do further
rework either to use a workqueue or we need a single driver handler
which then dispatches the sub handlers. The problem is threaded irq
handlers don't work with shared irqs.
It seems reasonable to me to at least wait until someone identifies a
platform which needs shared interrupts before embarking on the refactoring.
I don't know about real silicon, but it's certainly true of our internal
FPGA images that I've been playing with (the Juno board only has a
single IRQ line for the entire FPGA site). That's obviously not a major
priority for upstream, though, so I can hack around it if it's not
otherwise justified.
Robin.
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