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SubjectRe: [PATCH] wifi: ath11k: fix remapped ce accessing issue on 64bit OS
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On 5/1/24 11:14 AM, Ziyang Huang wrote:
> On 64bit OS, when ab->mem_ce is lower than or 4G far away from ab->mem,
> u32 is not enough to store the offsets, which makes ath11k_ahb_read32()
> and ath11k_ahb_write32() access incorrect address and causes Data Abort
> Exception.
>
> Let's use the high bits of offsets to decide where to access, which is
> similar as ath11k_pci_get_window_start() done. In the future, we can merge
> these functions for unified regs accessing.
>
> Signed-off-by: Ziyang Huang <hzyitc@outlook.com>
> ---
> drivers/net/wireless/ath/ath11k/ahb.c | 34 ++++++++++++++++++++-------
> drivers/net/wireless/ath/ath11k/hal.c | 17 +++++---------
> drivers/net/wireless/ath/ath11k/hw.c | 14 +++++------
> drivers/net/wireless/ath/ath11k/hw.h | 7 +++++-
> 4 files changed, 45 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/net/wireless/ath/ath11k/ahb.c b/drivers/net/wireless/ath/ath11k/ahb.c
> index 7c0a23517949..9e59b4de93a9 100644
> --- a/drivers/net/wireless/ath/ath11k/ahb.c
> +++ b/drivers/net/wireless/ath/ath11k/ahb.c
> @@ -198,12 +198,30 @@ static const struct ath11k_pci_ops ath11k_ahb_pci_ops_wcn6750 = {
>
> static inline u32 ath11k_ahb_read32(struct ath11k_base *ab, u32 offset)
> {
> - return ioread32(ab->mem + offset);
> + switch (offset & ATH11K_REG_TYPE_MASK) {
> + case ATH11K_REG_TYPE_NORMAL:
> + return ioread32(ab->mem + FIELD_GET(ATH11K_REG_OFFSET_MASK, offset));
> + case ATH11K_REG_TYPE_CE:
> + return ioread32(ab->mem_ce + FIELD_GET(ATH11K_REG_OFFSET_MASK, offset));
> + default:
> + BUG();

Do you really want to crash the system here? A dev_warn() or something similar
would log the situation. I suspect this case is never taken, but a system crash
is not a good response if it is.

> + return 0;
> + }
> }
>
> static inline void ath11k_ahb_write32(struct ath11k_base *ab, u32 offset, u32 value)
> {
> - iowrite32(value, ab->mem + offset);
> + switch (offset & ATH11K_REG_TYPE_MASK) {
> + case ATH11K_REG_TYPE_NORMAL:
> + iowrite32(value, ab->mem + FIELD_GET(ATH11K_REG_OFFSET_MASK, offset));
> + break;
> + case ATH11K_REG_TYPE_CE:
> + iowrite32(value, ab->mem_ce + FIELD_GET(ATH11K_REG_OFFSET_MASK, offset));
> + break;
> + default:
> + BUG();

Ditto.

Larry


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