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.
Signed-off-by: Alex Deucher alexander.deucher@amd.com --- drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c | 108 +++++++++++++++++++++++++++++--- drivers/gpu/drm/amd/amdgpu/amdgpu_irq.h | 9 +++ drivers/gpu/drm/amd/amdgpu/cik_ih.c | 6 ++ drivers/gpu/drm/amd/amdgpu/cz_ih.c | 7 +++ drivers/gpu/drm/amd/amdgpu/iceland_ih.c | 7 +++ drivers/gpu/drm/amd/amdgpu/tonga_ih.c | 7 +++ 6 files changed, 136 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c index 7c42ff6..3006182 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c @@ -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]; +} diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.h index 17b01aef..e124b59 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.h @@ -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 diff --git a/drivers/gpu/drm/amd/amdgpu/cik_ih.c b/drivers/gpu/drm/amd/amdgpu/cik_ih.c index 8993c50..30c9b3be 100644 --- a/drivers/gpu/drm/amd/amdgpu/cik_ih.c +++ b/drivers/gpu/drm/amd/amdgpu/cik_ih.c @@ -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; } diff --git a/drivers/gpu/drm/amd/amdgpu/cz_ih.c b/drivers/gpu/drm/amd/amdgpu/cz_ih.c index bc751bf..c79638f 100644 --- a/drivers/gpu/drm/amd/amdgpu/cz_ih.c +++ b/drivers/gpu/drm/amd/amdgpu/cz_ih.c @@ -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; } diff --git a/drivers/gpu/drm/amd/amdgpu/iceland_ih.c b/drivers/gpu/drm/amd/amdgpu/iceland_ih.c index 779532d..679e739 100644 --- a/drivers/gpu/drm/amd/amdgpu/iceland_ih.c +++ b/drivers/gpu/drm/amd/amdgpu/iceland_ih.c @@ -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; } diff --git a/drivers/gpu/drm/amd/amdgpu/tonga_ih.c b/drivers/gpu/drm/amd/amdgpu/tonga_ih.c index 743c372..b6f7d7b 100644 --- a/drivers/gpu/drm/amd/amdgpu/tonga_ih.c +++ b/drivers/gpu/drm/amd/amdgpu/tonga_ih.c @@ -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; }