From: Alessio Belle Date: Thu, 10 Apr 2025 09:55:05 +0000 (+0100) Subject: drm/imagination: Mask GPU IRQs in threaded handler X-Git-Tag: v6.16-rc1~144^2~16^2~93 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=bdced61365b4eca917b6df37d3d47c2f7d096d87;p=thirdparty%2Fkernel%2Flinux.git drm/imagination: Mask GPU IRQs in threaded handler Pass IRQF_ONESHOT flag to request_threaded_irq(), so that interrupts will be masked by the kernel until the end of the threaded IRQ handler. Since the calls to pvr_fw_irq_enable() and pvr_fw_irq_disable() are now redundant, remove them. Interrupts to the host from the soon-to-be-added RISC-V firmware processors cannot be masked in hardware. This change allows us to continue using the threaded handler in GPUs with a RISC-V firmware. For simplicity, the same approach is taken for all firmware processors. Signed-off-by: Alessio Belle Reviewed-by: Frank Binns Link: https://lore.kernel.org/r/20250410-sets-bxs-4-64-patch-v1-v6-6-eda620c5865f@imgtec.com Signed-off-by: Matt Coster --- diff --git a/drivers/gpu/drm/imagination/pvr_device.c b/drivers/gpu/drm/imagination/pvr_device.c index 1704c0268589b..b6ce936f07c8b 100644 --- a/drivers/gpu/drm/imagination/pvr_device.c +++ b/drivers/gpu/drm/imagination/pvr_device.c @@ -169,8 +169,6 @@ static irqreturn_t pvr_device_irq_thread_handler(int irq, void *data) ret = IRQ_HANDLED; } - /* Unmask FW irqs before returning, so new interrupts can be received. */ - pvr_fw_irq_enable(pvr_dev); return ret; } @@ -181,10 +179,6 @@ static irqreturn_t pvr_device_irq_handler(int irq, void *data) if (!pvr_fw_irq_pending(pvr_dev)) return IRQ_NONE; /* Spurious IRQ - ignore. */ - /* Mask the FW interrupts before waking up the thread. Will be unmasked - * when the thread handler is done processing events. - */ - pvr_fw_irq_disable(pvr_dev); return IRQ_WAKE_THREAD; } @@ -213,9 +207,13 @@ pvr_device_irq_init(struct pvr_device *pvr_dev) pvr_fw_irq_clear(pvr_dev); pvr_fw_irq_enable(pvr_dev); + /* + * The ONESHOT flag ensures IRQs are masked while the thread handler is + * running. + */ return request_threaded_irq(pvr_dev->irq, pvr_device_irq_handler, pvr_device_irq_thread_handler, - IRQF_SHARED, "gpu", pvr_dev); + IRQF_SHARED | IRQF_ONESHOT, "gpu", pvr_dev); } /**