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authorRob Herring <robh@kernel.org>2019-07-26 16:06:57 -0600
committerRob Herring <robh@kernel.org>2019-08-12 14:21:13 -0600
commitb31bdd1389fc765c07ab3d5b341092cb16807d29 (patch)
treecbe49b601d8f86390dba4b9fdab6948f9a6b5c6d /drivers/gpu/drm/panfrost/panfrost_mmu.c
parent73e467f60acdabd480d1b377a623ba13db0e5dd2 (diff)
downloadlwn-b31bdd1389fc765c07ab3d5b341092cb16807d29.tar.gz
lwn-b31bdd1389fc765c07ab3d5b341092cb16807d29.zip
drm/panfrost: Convert MMU IRQ handler to threaded handler
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
Diffstat (limited to 'drivers/gpu/drm/panfrost/panfrost_mmu.c')
-rw-r--r--drivers/gpu/drm/panfrost/panfrost_mmu.c20
1 files changed, 15 insertions, 5 deletions
diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c
index 13757427b886..b609ee55a872 100644
--- a/drivers/gpu/drm/panfrost/panfrost_mmu.c
+++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c
@@ -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");