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Re: [Xen-devel] [PATCH 2/4] AMD/IOMMU: Delete iommu_{get, set, clear}_bit() helpers
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 10 Feb 2020 14:39:34 +0000
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- Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Mon, 10 Feb 2020 14:42:10 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 05/02/2020 09:57, Jan Beulich wrote:
> On 03.02.2020 15:43, Andrew Cooper wrote:
>> @@ -85,16 +85,14 @@ static void flush_command_buffer(struct amd_iommu *iommu)
>> loop_count = 1000;
>> do {
>> status = readl(iommu->mmio_base + IOMMU_STATUS_MMIO_OFFSET);
>> - comp_wait = get_field_from_reg_u32(status,
>> - IOMMU_STATUS_COMP_WAIT_INT_MASK,
>> -
>> IOMMU_STATUS_COMP_WAIT_INT_SHIFT);
>> + comp_wait = status & IOMMU_STATUS_COMP_WAIT_INT;
> Unless you also change comp_wait to bool, this just happens to
> be correct this way because of the bit checked being at a low
> enough position.
>
>> --- a/xen/drivers/passthrough/amd/iommu_init.c
>> +++ b/xen/drivers/passthrough/amd/iommu_init.c
>> @@ -351,13 +351,12 @@ static void iommu_reset_log(struct amd_iommu *iommu,
>> BUG_ON(!iommu || ((log != &iommu->event_log) && (log !=
>> &iommu->ppr_log)));
>>
>> run_bit = ( log == &iommu->event_log ) ?
>> - IOMMU_STATUS_EVENT_LOG_RUN_SHIFT :
>> - IOMMU_STATUS_PPR_LOG_RUN_SHIFT;
>> + IOMMU_STATUS_EVENT_LOG_RUN : IOMMU_STATUS_PPR_LOG_RUN;
>>
>> /* wait until EventLogRun bit = 0 */
>> do {
>> entry = readl(iommu->mmio_base + IOMMU_STATUS_MMIO_OFFSET);
>> - log_run = iommu_get_bit(entry, run_bit);
>> + log_run = entry & run_bit;
> Same here for log_run then. I also think run_bit would better
> become unsigned int then.
>
> With these taken care of
> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
I have separate cleanup doing that (and more). I don't want to conflate
unrelated changes - this patch is complicated enough to follow.
~Andrew
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