Better would be to add them to a bitmask header and then use REG_GET_FIELD() so
it's nice and clean looking.
Tom
________________________________
From: amd-gfx <amd-gfx-boun...@lists.freedesktop.org> on behalf of Christian
König <deathsim...@vodafone.de>
Sent: Tuesday, September 27, 2016 08:52
To: Edward O'Callaghan; amd-gfx@lists.freedesktop.org
Subject: Re: [PATCH 2/2] drm/amdkfd: Decode bit fields in 'cik_ih_ring_entry'
directly
NAK, don't use bitfields to decode hardware values. They aren't portable.
Regards,
Christian.
Am 27.09.2016 um 14:47 schrieb Edward O'Callaghan:
> Signed-off-by: Edward O'Callaghan <funfunc...@folklore1984.net>
> ---
> drivers/gpu/drm/amd/amdkfd/cik_event_interrupt.c | 15 +++++----------
> drivers/gpu/drm/amd/amdkfd/cik_int.h | 20 ++++++++++++++++----
> 2 files changed, 21 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/cik_event_interrupt.c
> b/drivers/gpu/drm/amd/amdkfd/cik_event_interrupt.c
> index 211fc48..1c47b9e 100644
> --- a/drivers/gpu/drm/amd/amdkfd/cik_event_interrupt.c
> +++ b/drivers/gpu/drm/amd/amdkfd/cik_event_interrupt.c
> @@ -27,14 +27,12 @@
> static bool cik_event_interrupt_isr(struct kfd_dev *dev,
> const uint32_t *ih_ring_entry)
> {
> - unsigned int pasid;
> const struct cik_ih_ring_entry *ihre =
> (const struct cik_ih_ring_entry *)ih_ring_entry;
>
> - pasid = (ihre->ring_id & 0xffff0000) >> 16;
>
> /* Do not process in ISR, just request it to be forwarded to WQ. */
> - return (pasid != 0) &&
> + return (ihre->pasid != 0) &&
> (ihre->source_id == CIK_INTSRC_CP_END_OF_PIPE ||
> ihre->source_id == CIK_INTSRC_SQ_INTERRUPT_MSG ||
> ihre->source_id == CIK_INTSRC_CP_BAD_OPCODE);
> @@ -43,21 +41,18 @@ static bool cik_event_interrupt_isr(struct kfd_dev *dev,
> static void cik_event_interrupt_wq(struct kfd_dev *dev,
> const uint32_t *ih_ring_entry)
> {
> - unsigned int pasid;
> const struct cik_ih_ring_entry *ihre =
> (const struct cik_ih_ring_entry *)ih_ring_entry;
>
> - pasid = (ihre->ring_id & 0xffff0000) >> 16;
> -
> - if (pasid == 0)
> + if (ihre->pasid == 0)
> return;
>
> if (ihre->source_id == CIK_INTSRC_CP_END_OF_PIPE)
> - kfd_signal_event_interrupt(pasid, 0, 0);
> + kfd_signal_event_interrupt(ihre->pasid, 0, 0);
> else if (ihre->source_id == CIK_INTSRC_SQ_INTERRUPT_MSG)
> - kfd_signal_event_interrupt(pasid, ihre->data & 0xFF, 8);
> + kfd_signal_event_interrupt(ihre->pasid, ihre->data & 0xFF, 8);
> else if (ihre->source_id == CIK_INTSRC_CP_BAD_OPCODE)
> - kfd_signal_hw_exception_event(pasid);
> + kfd_signal_hw_exception_event(ihre->pasid);
> }
>
> const struct kfd_event_interrupt_class event_interrupt_class_cik = {
> diff --git a/drivers/gpu/drm/amd/amdkfd/cik_int.h
> b/drivers/gpu/drm/amd/amdkfd/cik_int.h
> index 79a16d2..27d1ede 100644
> --- a/drivers/gpu/drm/amd/amdkfd/cik_int.h
> +++ b/drivers/gpu/drm/amd/amdkfd/cik_int.h
> @@ -26,10 +26,22 @@
> #include <linux/types.h>
>
> struct cik_ih_ring_entry {
> - uint32_t source_id;
> - uint32_t data;
> - uint32_t ring_id;
> - uint32_t reserved;
> + uint32_t source_id:8;
> + uint32_t reserved1:8;
> + uint32_t reserved2:16;
> +
> + uint32_t data:28;
> + uint32_t reserved3:4;
> +
> + /* pipeid, meid and unused3 are officially called RINGID,
> + * but for our purposes, they always decode into pipe and ME. */
> + uint32_t pipeid:2;
> + uint32_t meid:2;
> + uint32_t reserved4:4;
> + uint32_t vmid:8;
> + uint32_t pasid:16;
> +
> + uint32_t reserved5;
> };
>
> #define CIK_INTSRC_DEQUEUE_COMPLETE 0xC6
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