drm/amdgpu: add irq domain support

Hardware blocks on the GPU like ACP generate interrupts in
the GPU interrupt controller, but are driven by a separate
driver.  Add an irq domain to the GPU driver so that
blocks like ACP can register a Linux interrupt.

Acked-by: Dave Airlie <airlied@redhat.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2015-11-06 01:29:08 -05:00
parent ba228ac8f5
commit 5f2323658e
6 changed files with 136 additions and 8 deletions

View File

@ -312,6 +312,7 @@ int amdgpu_irq_add_id(struct amdgpu_device *adev, unsigned src_id,
}
adev->irq.sources[src_id] = source;
return 0;
}
@ -335,15 +336,19 @@ void amdgpu_irq_dispatch(struct amdgpu_device *adev,
return;
}
src = adev->irq.sources[src_id];
if (!src) {
DRM_DEBUG("Unhandled interrupt src_id: %d\n", src_id);
return;
}
if (adev->irq.virq[src_id]) {
generic_handle_irq(irq_find_mapping(adev->irq.domain, src_id));
} else {
src = adev->irq.sources[src_id];
if (!src) {
DRM_DEBUG("Unhandled interrupt src_id: %d\n", src_id);
return;
}
r = src->funcs->process(adev, src, entry);
if (r)
DRM_ERROR("error processing interrupt (%d)\n", r);
r = src->funcs->process(adev, src, entry);
if (r)
DRM_ERROR("error processing interrupt (%d)\n", r);
}
}
/**
@ -461,3 +466,90 @@ bool amdgpu_irq_enabled(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
return !!atomic_read(&src->enabled_types[type]);
}
/* gen irq */
static void amdgpu_irq_mask(struct irq_data *irqd)
{
/* XXX */
}
static void amdgpu_irq_unmask(struct irq_data *irqd)
{
/* XXX */
}
static struct irq_chip amdgpu_irq_chip = {
.name = "amdgpu-ih",
.irq_mask = amdgpu_irq_mask,
.irq_unmask = amdgpu_irq_unmask,
};
static int amdgpu_irqdomain_map(struct irq_domain *d,
unsigned int irq, irq_hw_number_t hwirq)
{
if (hwirq >= AMDGPU_MAX_IRQ_SRC_ID)
return -EPERM;
irq_set_chip_and_handler(irq,
&amdgpu_irq_chip, handle_simple_irq);
return 0;
}
static struct irq_domain_ops amdgpu_hw_irqdomain_ops = {
.map = amdgpu_irqdomain_map,
};
/**
* amdgpu_irq_add_domain - create a linear irq domain
*
* @adev: amdgpu device pointer
*
* Create an irq domain for GPU interrupt sources
* that may be driven by another driver (e.g., ACP).
*/
int amdgpu_irq_add_domain(struct amdgpu_device *adev)
{
adev->irq.domain = irq_domain_add_linear(NULL, AMDGPU_MAX_IRQ_SRC_ID,
&amdgpu_hw_irqdomain_ops, adev);
if (!adev->irq.domain) {
DRM_ERROR("GPU irq add domain failed\n");
return -ENODEV;
}
return 0;
}
/**
* amdgpu_irq_remove_domain - remove the irq domain
*
* @adev: amdgpu device pointer
*
* Remove the irq domain for GPU interrupt sources
* that may be driven by another driver (e.g., ACP).
*/
void amdgpu_irq_remove_domain(struct amdgpu_device *adev)
{
if (adev->irq.domain) {
irq_domain_remove(adev->irq.domain);
adev->irq.domain = NULL;
}
}
/**
* amdgpu_irq_create_mapping - create a mapping between a domain irq and a
* Linux irq
*
* @adev: amdgpu device pointer
* @src_id: IH source id
*
* Create a mapping between a domain irq (GPU IH src id) and a Linux irq
* Use this for components that generate a GPU interrupt, but are driven
* by a different driver (e.g., ACP).
* Returns the Linux irq.
*/
unsigned amdgpu_irq_create_mapping(struct amdgpu_device *adev, unsigned src_id)
{
adev->irq.virq[src_id] = irq_create_mapping(adev->irq.domain, src_id);
return adev->irq.virq[src_id];
}

View File

@ -24,6 +24,7 @@
#ifndef __AMDGPU_IRQ_H__
#define __AMDGPU_IRQ_H__
#include <linux/irqdomain.h>
#include "amdgpu_ih.h"
#define AMDGPU_MAX_IRQ_SRC_ID 0x100
@ -65,6 +66,10 @@ struct amdgpu_irq {
/* interrupt ring */
struct amdgpu_ih_ring ih;
const struct amdgpu_ih_funcs *ih_funcs;
/* gen irq stuff */
struct irq_domain *domain; /* GPU irq controller domain */
unsigned virq[AMDGPU_MAX_IRQ_SRC_ID];
};
void amdgpu_irq_preinstall(struct drm_device *dev);
@ -90,4 +95,8 @@ int amdgpu_irq_put(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
bool amdgpu_irq_enabled(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
unsigned type);
int amdgpu_irq_add_domain(struct amdgpu_device *adev);
void amdgpu_irq_remove_domain(struct amdgpu_device *adev);
unsigned amdgpu_irq_create_mapping(struct amdgpu_device *adev, unsigned src_id);
#endif

View File

@ -274,6 +274,11 @@ static void cik_ih_set_rptr(struct amdgpu_device *adev)
static int cik_ih_early_init(void *handle)
{
struct amdgpu_device *adev = (struct amdgpu_device *)handle;
int ret;
ret = amdgpu_irq_add_domain(adev);
if (ret)
return ret;
cik_ih_set_interrupt_funcs(adev);
@ -300,6 +305,7 @@ static int cik_ih_sw_fini(void *handle)
amdgpu_irq_fini(adev);
amdgpu_ih_ring_fini(adev);
amdgpu_irq_remove_domain(adev);
return 0;
}

View File

@ -253,8 +253,14 @@ static void cz_ih_set_rptr(struct amdgpu_device *adev)
static int cz_ih_early_init(void *handle)
{
struct amdgpu_device *adev = (struct amdgpu_device *)handle;
int ret;
ret = amdgpu_irq_add_domain(adev);
if (ret)
return ret;
cz_ih_set_interrupt_funcs(adev);
return 0;
}
@ -278,6 +284,7 @@ static int cz_ih_sw_fini(void *handle)
amdgpu_irq_fini(adev);
amdgpu_ih_ring_fini(adev);
amdgpu_irq_remove_domain(adev);
return 0;
}

View File

@ -253,8 +253,14 @@ static void iceland_ih_set_rptr(struct amdgpu_device *adev)
static int iceland_ih_early_init(void *handle)
{
struct amdgpu_device *adev = (struct amdgpu_device *)handle;
int ret;
ret = amdgpu_irq_add_domain(adev);
if (ret)
return ret;
iceland_ih_set_interrupt_funcs(adev);
return 0;
}
@ -278,6 +284,7 @@ static int iceland_ih_sw_fini(void *handle)
amdgpu_irq_fini(adev);
amdgpu_ih_ring_fini(adev);
amdgpu_irq_remove_domain(adev);
return 0;
}

View File

@ -273,8 +273,14 @@ static void tonga_ih_set_rptr(struct amdgpu_device *adev)
static int tonga_ih_early_init(void *handle)
{
struct amdgpu_device *adev = (struct amdgpu_device *)handle;
int ret;
ret = amdgpu_irq_add_domain(adev);
if (ret)
return ret;
tonga_ih_set_interrupt_funcs(adev);
return 0;
}
@ -301,6 +307,7 @@ static int tonga_ih_sw_fini(void *handle)
amdgpu_irq_fini(adev);
amdgpu_ih_ring_fini(adev);
amdgpu_irq_add_domain(adev);
return 0;
}