// SPDX-License-Identifier: GPL-2.0+
/* Copyright (C) 2014-2018 Broadcom */
/**
* DOC: Interrupt management for the V3D engine
*
* When we take a binning or rendering flush done interrupt, we need
* to signal the fence for that job so that the scheduler can queue up
* the next one and unblock any waiters.
*
* When we take the binner out of memory interrupt, we need to
* allocate some new memory and pass it to the binner so that the
* current job can make progress.
*/
#include "v3d_drv.h"
#include "v3d_regs.h"
#define V3D_CORE_IRQS ((u32)(V3D_INT_OUTOMEM | \
V3D_INT_FLDONE | \
V3D_INT_FRDONE | \
V3D_INT_GMPV))
#define V3D_HUB_IRQS ((u32)(V3D_HUB_INT_MMU_WRV | \
V3D_HUB_INT_MMU_PTI | \
V3D_HUB_INT_MMU_CAP))
static void
v3d_overflow_mem_work(struct work_struct *work)
{
struct v3d_dev *v3d =
container_of(work, struct v3d_dev, overflow_mem_work);
struct drm_device *dev = &v3d->drm;
struct v3d_bo *bo = v3d_bo_create(dev, NULL /* XXX: GMP */, 256 * 1024);
unsigned long irqflags;
if (IS_ERR(bo)) {
DRM_ERROR("Couldn't allocate binner overflow mem\n");
return;
}
/* We lost a race, and our work task came in after the bin job
* completed and exited. This can happen because the HW
* signals OOM before it's fully OOM, so the binner might just
* barely complete.
*
* If we lose the race and our work task comes in after a new
* bin job got scheduled, that's fine. We'll just give them
* some binner pool anyway.
*/
spin_lock_irqsave(&v3d->job_lock, irqflags);
if (!v3d->bin_job) {
spin_unlock_irqrestore(&v3d->job_lock, irqflags);
goto out;
}
drm_gem_object_get(&bo->base);
list_add_tail(&bo->unref_head, &v3d->bin_job->unref_list);
spin_unlock_irqrestore(&v3d->job_lock, irqflags);
V3D_CORE_WRITE(0, V3D_PTB_BPOA, bo->node.start << PAGE_SHIFT);
V3D_CORE_WRITE(0, V3D_PTB_BPOS, bo->base.size);
out:
drm_gem_object_put_unlocked(&bo->base);
}
static irqreturn_t
v3d_irq(int irq, void *arg)
{
struct v3d_dev *v3d = arg;
u32 intsts;
irqreturn_t status = IRQ_NONE;
intsts = V3D_CORE_READ(0, V3D_CTL_INT_STS);
/* Acknowledge the interrupts we're handling here. */
V3D_CORE_WRITE(0, V3D_CTL_INT_CLR, intsts);
if (intsts & V3D_INT_OUTOMEM) {
/* Note that the OOM status is edge signaled, so the
* interrupt won't happen again until the we actually
* add more memory.
*/
schedule_work(&v3d->overflow_mem_work);
status = IRQ_HANDLED;
}
if (intsts & V3D_INT_FLDONE) {
dma_fence_signal(v3d->bin_job->bin.done_fence);
status = IRQ_HANDLED;
}
if (intsts & V3D_INT_FRDONE) {
dma_fence_signal(v3d->render_job->render.done_fence);
status = IRQ_HANDLED;
}
/* We shouldn't be triggering these if we have GMP in
* always-allowed mode.
*/
if (intsts & V3D_INT_GMPV)
dev_err(v3d->dev, "GMP violation\n");
return status;
}
static irqreturn_t
v3d_hub_irq(int irq, void *arg)
{
struct v3d_dev *v3d = arg;
u32 intsts;
irqreturn_t status = IRQ_NONE;
intsts = V3D_READ(V3D_HUB_INT_STS);
/* Acknowledge the interrupts we're handling here. */
V3D_WRITE(V3D_HUB_INT_CLR, intsts);
if (intsts & (V3D_HUB_INT_MMU_WRV |
V3D_HUB_INT_MMU_PTI |
V3D_HUB_INT_MMU_CAP)) {
u32 axi_id = V3D_READ(V3D_MMU_VIO_ID);
u64 vio_addr = (u64)V3D_READ(V3D_MMU_VIO_ADDR) << 8;
dev_err(v3d->dev, "MMU error from client %d at 0x%08llx%s%s%s\n",
axi_id, (long long)vio_addr,
((intsts & V3D_HUB_INT_MMU_WRV) ?
", write violation" : ""),
((intsts & V3D_HUB_INT_MMU_PTI) ?
", pte invalid" : ""),
((intsts & V3D_HUB_INT_MMU_CAP) ?
", cap exceeded" : ""));
status = IRQ_HANDLED;
}
return status;
}
void
v3d_irq_init(struct v3d_dev *v3d)
{
int ret, core;
INIT_WORK(&v3d->overflow_mem_work, v3d_overflow_mem_work);
/* Clear any pending interrupts someone might have left around
* for us.
*/
for (core = 0; core < v3d->cores; core++)
V3D_CORE_WRITE(core, V3D_CTL_INT_CLR, V3D_CORE_IRQS);
V3D_WRITE(V3D_HUB_INT_CLR, V3D_HUB_IRQS);
ret = devm_request_irq(v3d->dev, platform_get_irq(v3d->pdev, 0),
v3d_hub_irq, IRQF_SHARED,
"v3d_hub", v3d);
ret = devm_request_irq(v3d->dev, platform_get_irq(v3d->pdev, 1),
v3d_irq, IRQF_SHARED,
"v3d_core0", v3d);
if (ret)
dev_err(v3d->dev, "IRQ setup failed: %d\n", ret);
v3d_irq_enable(v3d);
}
void
v3d_irq_enable(struct v3d_dev *v3d)
{
int core;
/* Enable our set of interrupts, masking out any others. */
for (core = 0; core < v3d->cores; core++) {
V3D_CORE_WRITE(core, V3D_CTL_INT_MSK_SET, ~V3D_CORE_IRQS);
V3D_CORE_WRITE(core, V3D_CTL_INT_MSK_CLR, V3D_CORE_IRQS);
}
V3D_WRITE(V3D_HUB_INT_MSK_SET, ~V3D_HUB_IRQS);
V3D_WRITE(V3D_HUB_INT_MSK_CLR, V3D_HUB_IRQS);
}
void
v3d_irq_disable(struct v3d_dev *v3d)
{
int core;
/* Disable all interrupts. */
for (core = 0; core < v3d->cores; core++)
V3D_CORE_WRITE(core, V3D_CTL_INT_MSK_SET, ~0);
V3D_WRITE(V3D_HUB_INT_MSK_SET, ~0);
/* Clear any pending interrupts we might have left. */
for (core = 0; core < v3d->cores; core++)
V3D_CORE_WRITE(core, V3D_CTL_INT_CLR, V3D_CORE_IRQS);
V3D_WRITE(V3D_HUB_INT_CLR, V3D_HUB_IRQS);
cancel_work_sync(&v3d->overflow_mem_work);
}
/** Reinitializes interrupt registers when a GPU reset is performed. */
void v3d_irq_reset(struct v3d_dev *v3d)
{
v3d_irq_enable(v3d);
}
