[PATCH 01/14] drm/amdgpu: Convert to Linux IRQ interfaces
Thomas Zimmermann
tzimmermann at suse.de
Mon Aug 2 08:43:24 UTC 2021
Hi
Am 28.07.21 um 16:03 schrieb Alex Deucher:
> On Wed, Jul 28, 2021 at 6:27 AM Christian König
> <christian.koenig at amd.com> wrote:
>>
>> Am 27.07.21 um 20:27 schrieb Thomas Zimmermann:
>>> Drop the DRM IRQ midlayer in favor of Linux IRQ interfaces. DRM's
>>> IRQ helpers are mostly useful for UMS drivers. Modern KMS drivers
>>> don't benefit from using it.
>>>
>>> DRM IRQ callbacks are now being called directly or inlined.
>>>
>>> The interrupt number returned by pci_msi_vector() is now stored
>>> in struct amdgpu_irq. Calls to pci_msi_vector() can fail and return
>>> a negative errno code. Abort initlaizaton in thi case. The DRM IRQ
>>> midlayer does not handle this correctly.
>>>
>>> Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
>>
>> Alex needs to take a look at this as well, but of hand the patch is
>> Acked-by: Christian König <christian.koenig at amd.com>.
>
> Looks good to me as well:
> Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
Thanks a lot. Do you have comments on the changes to radeon?
Best regards
Thomas
>
>>
>> Thanks,
>> Christian.
>>
>>> ---
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 1 -
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c | 21 ++++++++++++++-------
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_irq.h | 2 +-
>>> 3 files changed, 15 insertions(+), 9 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>>> index 2bd13fc2541a..1e05b5aa94e7 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>>> @@ -1775,7 +1775,6 @@ static const struct drm_driver amdgpu_kms_driver = {
>>> .open = amdgpu_driver_open_kms,
>>> .postclose = amdgpu_driver_postclose_kms,
>>> .lastclose = amdgpu_driver_lastclose_kms,
>>> - .irq_handler = amdgpu_irq_handler,
>>> .ioctls = amdgpu_ioctls_kms,
>>> .num_ioctls = ARRAY_SIZE(amdgpu_ioctls_kms),
>>> .dumb_create = amdgpu_mode_dumb_create,
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
>>> index 0d01cfaca77e..a36cdc7323f4 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
>>> @@ -46,7 +46,6 @@
>>> #include <linux/pci.h>
>>>
>>> #include <drm/drm_crtc_helper.h>
>>> -#include <drm/drm_irq.h>
>>> #include <drm/drm_vblank.h>
>>> #include <drm/amdgpu_drm.h>
>>> #include <drm/drm_drv.h>
>>> @@ -184,7 +183,7 @@ void amdgpu_irq_disable_all(struct amdgpu_device *adev)
>>> * Returns:
>>> * result of handling the IRQ, as defined by &irqreturn_t
>>> */
>>> -irqreturn_t amdgpu_irq_handler(int irq, void *arg)
>>> +static irqreturn_t amdgpu_irq_handler(int irq, void *arg)
>>> {
>>> struct drm_device *dev = (struct drm_device *) arg;
>>> struct amdgpu_device *adev = drm_to_adev(dev);
>>> @@ -307,6 +306,7 @@ static void amdgpu_restore_msix(struct amdgpu_device *adev)
>>> int amdgpu_irq_init(struct amdgpu_device *adev)
>>> {
>>> int r = 0;
>>> + unsigned int irq;
>>>
>>> spin_lock_init(&adev->irq.lock);
>>>
>>> @@ -349,15 +349,22 @@ int amdgpu_irq_init(struct amdgpu_device *adev)
>>> INIT_WORK(&adev->irq.ih2_work, amdgpu_irq_handle_ih2);
>>> INIT_WORK(&adev->irq.ih_soft_work, amdgpu_irq_handle_ih_soft);
>>>
>>> - adev->irq.installed = true;
>>> - /* Use vector 0 for MSI-X */
>>> - r = drm_irq_install(adev_to_drm(adev), pci_irq_vector(adev->pdev, 0));
>>> + /* Use vector 0 for MSI-X. */
>>> + r = pci_irq_vector(adev->pdev, 0);
>>> + if (r < 0)
>>> + return r;
>>> + irq = r;
>>> +
>>> + /* PCI devices require shared interrupts. */
>>> + r = request_irq(irq, amdgpu_irq_handler, IRQF_SHARED, adev_to_drm(adev)->driver->name,
>>> + adev_to_drm(adev));
>>> if (r) {
>>> - adev->irq.installed = false;
>>> if (!amdgpu_device_has_dc_support(adev))
>>> flush_work(&adev->hotplug_work);
>>> return r;
>>> }
>>> + adev->irq.installed = true;
>>> + adev->irq.irq = irq;
>>> adev_to_drm(adev)->max_vblank_count = 0x00ffffff;
>>>
>>> DRM_DEBUG("amdgpu: irq initialized.\n");
>>> @@ -368,7 +375,7 @@ int amdgpu_irq_init(struct amdgpu_device *adev)
>>> void amdgpu_irq_fini_hw(struct amdgpu_device *adev)
>>> {
>>> if (adev->irq.installed) {
>>> - drm_irq_uninstall(&adev->ddev);
>>> + free_irq(adev->irq.irq, adev_to_drm(adev));
>>> adev->irq.installed = false;
>>> if (adev->irq.msi_enabled)
>>> pci_free_irq_vectors(adev->pdev);
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.h
>>> index 78ad4784cc74..e9f2c11ea416 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.h
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.h
>>> @@ -80,6 +80,7 @@ struct amdgpu_irq_src_funcs {
>>>
>>> struct amdgpu_irq {
>>> bool installed;
>>> + unsigned int irq;
>>> spinlock_t lock;
>>> /* interrupt sources */
>>> struct amdgpu_irq_client client[AMDGPU_IRQ_CLIENTID_MAX];
>>> @@ -100,7 +101,6 @@ struct amdgpu_irq {
>>> };
>>>
>>> void amdgpu_irq_disable_all(struct amdgpu_device *adev);
>>> -irqreturn_t amdgpu_irq_handler(int irq, void *arg);
>>>
>>> int amdgpu_irq_init(struct amdgpu_device *adev);
>>> void amdgpu_irq_fini_sw(struct amdgpu_device *adev);
>>
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer
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