Hi Mario,
On Fri, Apr 21, 2023 at 09:07:24AM -0500, Mario Limonciello wrote:
> When `QUIRK_AUTO_CLEAR_INT` isn't set, interrupt masking should be
> cleared by writing to Interrupt Mask Clear (IMR) and interrupt
> status should be cleared properly at shutdown/init.
>
> This fixes an error where interrupts are left enabled during resume
> from hibernation with `CONFIG_USB4=y`.
>
> Fixes: 468c49f44759 ("thunderbolt: Disable interrupt auto clear for rings")
> Reported-by: Takashi Iwai <tiwai@xxxxxxx>
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=217343
> Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
> Tested-by: Takashi Iwai <tiwai@xxxxxxx>
> ---
> I tried to base this off thunderbolt.git/next (tag: thunderbolt-for-v6.4-rc1)
> but the following 3 commits are missing from that branch but are in 6.3-rc7:
>
> 58cdfe6f58b3 thunderbolt: Rename shadowed variables bit to interrupt_bit and auto_clear_bit
> 468c49f44759 thunderbolt: Disable interrupt auto clear for rings
> 1716efdb0793 thunderbolt: Use const qualifier for `ring_interrupt_index`
>
> I cherry picked them first as this patch builds on them.
Okay, so if I take this after v6.4-rc1 is released and send it forward
to for -rc2 Greg it should apply just fine?
> ---
> drivers/thunderbolt/nhi.c | 28 +++++++++++++++++++++-------
> drivers/thunderbolt/nhi_regs.h | 1 +
> 2 files changed, 22 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c
> index d76e923fbc6a..7c543a6a5711 100644
> --- a/drivers/thunderbolt/nhi.c
> +++ b/drivers/thunderbolt/nhi.c
> @@ -61,8 +61,9 @@ static int ring_interrupt_index(const struct tb_ring *ring)
> */
> static void ring_interrupt_active(struct tb_ring *ring, bool active)
> {
> - int reg = REG_RING_INTERRUPT_BASE +
> - ring_interrupt_index(ring) / 32 * 4;
> + int index = ring_interrupt_index(ring) / 32 * 4;
> + int reg = REG_RING_INTERRUPT_BASE + index;
> + int clear = REG_RING_INTERRUPT_MASK_CLEAR_BASE + index;
> int interrupt_bit = ring_interrupt_index(ring) & 31;
> int mask = 1 << interrupt_bit;
> u32 old, new;
> @@ -123,7 +124,11 @@ static void ring_interrupt_active(struct tb_ring *ring, bool active)
> "interrupt for %s %d is already %s\n",
> RING_TYPE(ring), ring->hop,
> active ? "enabled" : "disabled");
> - iowrite32(new, ring->nhi->iobase + reg);
> +
> + if (active)
> + iowrite32(new, ring->nhi->iobase + reg);
> + else
> + iowrite32(mask, ring->nhi->iobase + clear);
Since it is doing this for all hardware, even for Intel, I will need to
run some testing to make sure this still works.
> }
>
> /*
> @@ -135,12 +140,21 @@ static void nhi_disable_interrupts(struct tb_nhi *nhi)
> {
> int i = 0;
> /* disable interrupts */
> - for (i = 0; i < RING_INTERRUPT_REG_COUNT(nhi); i++)
> - iowrite32(0, nhi->iobase + REG_RING_INTERRUPT_BASE + 4 * i);
> + for (i = 0; i < RING_INTERRUPT_REG_COUNT(nhi); i++) {
> + if (nhi->quirks & QUIRK_AUTO_CLEAR_INT)
> + iowrite32(0, nhi->iobase + REG_RING_INTERRUPT_BASE + 4 * i);
> + else
> + iowrite32(0xffffffff,
~0
> + nhi->iobase + REG_RING_INTERRUPT_MASK_CLEAR_BASE + 4 * i);
Btw, we have now quite many places with
if (nhi->quirks & QUIRK_AUTO_CLEAR_INT)
// Intel stuff
else
// non-Intel stuff
I wonder if we could move these behind a wrapper and then here (and
similar places) just call
nhi_mask_interrupt(nhi, ...)
> + }
>
> /* clear interrupt status bits */
> - for (i = 0; i < RING_NOTIFY_REG_COUNT(nhi); i++)
> - ioread32(nhi->iobase + REG_RING_NOTIFY_BASE + 4 * i);
> + for (i = 0; i < RING_NOTIFY_REG_COUNT(nhi); i++) {
> + if (nhi->quirks & QUIRK_AUTO_CLEAR_INT)
> + ioread32(nhi->iobase + REG_RING_NOTIFY_BASE + 4 * i);
> + else
> + iowrite32(0xffffffff, nhi->iobase + REG_RING_INT_CLEAR + 4 * i);
~0
nhi_clear_interrupt(nhi, ...)
> + }
> }
>
> /* ring helper methods */
> diff --git a/drivers/thunderbolt/nhi_regs.h b/drivers/thunderbolt/nhi_regs.h
> index faef165a919c..db95ad5d2814 100644
> --- a/drivers/thunderbolt/nhi_regs.h
> +++ b/drivers/thunderbolt/nhi_regs.h
> @@ -92,6 +92,7 @@ struct ring_desc {
> */
> #define REG_RING_INTERRUPT_BASE 0x38200
> #define RING_INTERRUPT_REG_COUNT(nhi) ((31 + 2 * nhi->hop_count) / 32)
Empty line here.
> +#define REG_RING_INTERRUPT_MASK_CLEAR_BASE 0x38208
>
> #define REG_INT_THROTTLING_RATE 0x38c00
>
> --
> 2.34.1
