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drm/panfrost: Convert MMU IRQ handler to threaded handler

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In preparation to handle mapping of page faults, we need the MMU handler
to be threaded as code paths take a mutex.

As the IRQ may be shared, we can't use the default handler and must
disable the MMU interrupts locally.

Cc: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Cc: Boris Brezillon <boris.brezillon@collabora.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190808222200.13176-8-robh@kernel.org
This commit is contained in:
Rob Herring 2019-07-26 16:06:57 -06:00
parent 73e467f60a
commit b31bdd1389
1 changed files with 15 additions and 5 deletions
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20
drivers/gpu/drm/panfrost/panfrost_mmu.c
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@ -305,12 +305,20 @@ static const char *access_type_name(struct panfrost_device *pfdev,
static irqreturn_t panfrost_mmu_irq_handler(int irq, void *data)
{
struct panfrost_device *pfdev = data;
u32 status = mmu_read(pfdev, MMU_INT_STAT);
int i;
if (!status)
if (!mmu_read(pfdev, MMU_INT_STAT))
return IRQ_NONE;
mmu_write(pfdev, MMU_INT_MASK, 0);
return IRQ_WAKE_THREAD;
}
static irqreturn_t panfrost_mmu_irq_handler_thread(int irq, void *data)
{
struct panfrost_device *pfdev = data;
u32 status = mmu_read(pfdev, MMU_INT_RAWSTAT);
int i;
dev_err(pfdev->dev, "mmu irq status=%x\n", status);
for (i = 0; status; i++) {
@ -355,6 +363,7 @@ static irqreturn_t panfrost_mmu_irq_handler(int irq, void *data)
status &= ~mask;
}
mmu_write(pfdev, MMU_INT_MASK, ~0);
return IRQ_HANDLED;
};
@ -373,8 +382,9 @@ 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, panfrost_mmu_irq_handler,
panfrost_mmu_irq_handler_thread,
IRQF_SHARED, "mmu", pfdev);
if (err) {
dev_err(pfdev->dev, "failed to request mmu irq");