Re: [Xen-devel] [PATCH v3 07/14] AMD/IOMMU: pass IOMMU to {get, free, update}_intremap_entry()

["Woods, Brian" <Brian.Woods@amd.com>]

On Tue, Jul 16, 2019 at 04:37:51PM +0000, Jan Beulich wrote:
> The functions will want to know IOMMU properties (specifically the IRTE
> size) subsequently.
> 
> Rather than introducing a second error path bogusly returning -E... from
> amd_iommu_read_ioapic_from_ire(), also change the existing one to follow
> VT-d in returning the raw (untranslated) IO-APIC RTE.
> 
> Signed-off-by: Jan Beulich <jbeulich@suse.com>

Acked-by: Brian Woods <brian.woods@amd.com>

> ---
> v3: New.
> 
> --- a/xen/drivers/passthrough/amd/iommu_intr.c
> +++ b/xen/drivers/passthrough/amd/iommu_intr.c
> @@ -123,11 +123,11 @@ static unsigned int alloc_intremap_entry
>       return slot;
>   }
>   
> -static union irte_ptr get_intremap_entry(unsigned int seg, unsigned int bdf,
> -                                         unsigned int index)
> +static union irte_ptr get_intremap_entry(const struct amd_iommu *iommu,
> +                                         unsigned int bdf, unsigned int index)
>   {
>       union irte_ptr table = {
> -        .ptr = get_ivrs_mappings(seg)[bdf].intremap_table
> +        .ptr = get_ivrs_mappings(iommu->seg)[bdf].intremap_table
>       };
>   
>       ASSERT(table.ptr && (index < INTREMAP_ENTRIES));
> @@ -137,18 +137,19 @@ static union irte_ptr get_intremap_entry
>       return table;
>   }
>   
> -static void free_intremap_entry(unsigned int seg, unsigned int bdf,
> -                                unsigned int index)
> +static void free_intremap_entry(const struct amd_iommu *iommu,
> +                                unsigned int bdf, unsigned int index)
>   {
> -    union irte_ptr entry = get_intremap_entry(seg, bdf, index);
> +    union irte_ptr entry = get_intremap_entry(iommu, bdf, index);
>   
>       ACCESS_ONCE(entry.ptr32->raw[0]) = 0;
>   
> -    __clear_bit(index, get_ivrs_mappings(seg)[bdf].intremap_inuse);
> +    __clear_bit(index, get_ivrs_mappings(iommu->seg)[bdf].intremap_inuse);
>   }
>   
> -static void update_intremap_entry(union irte_ptr entry, unsigned int vector,
> -                                  unsigned int int_type,
> +static void update_intremap_entry(const struct amd_iommu *iommu,
> +                                  union irte_ptr entry,
> +                                  unsigned int vector, unsigned int int_type,
>                                     unsigned int dest_mode, unsigned int dest)
>   {
>       struct irte_basic basic = {
> @@ -212,7 +213,7 @@ static int update_intremap_entry_from_io
>           lo_update = 1;
>       }
>   
> -    entry = get_intremap_entry(iommu->seg, req_id, offset);
> +    entry = get_intremap_entry(iommu, req_id, offset);
>       if ( !lo_update )
>       {
>           /*
> @@ -223,7 +224,7 @@ static int update_intremap_entry_from_io
>           vector = entry.ptr32->basic.vector;
>           delivery_mode = entry.ptr32->basic.int_type;
>       }
> -    update_intremap_entry(entry, vector, delivery_mode, dest_mode, dest);
> +    update_intremap_entry(iommu, entry, vector, delivery_mode, dest_mode, dest);
>   
>       spin_unlock_irqrestore(lock, flags);
>   
> @@ -288,8 +289,8 @@ int __init amd_iommu_setup_ioapic_remapp
>               spin_lock_irqsave(lock, flags);
>               offset = alloc_intremap_entry(seg, req_id, 1);
>               BUG_ON(offset >= INTREMAP_ENTRIES);
> -            entry = get_intremap_entry(iommu->seg, req_id, offset);
> -            update_intremap_entry(entry, vector,
> +            entry = get_intremap_entry(iommu, req_id, offset);
> +            update_intremap_entry(iommu, entry, vector,
>                                     delivery_mode, dest_mode, dest);
>               spin_unlock_irqrestore(lock, flags);
>   
> @@ -413,7 +414,7 @@ unsigned int amd_iommu_read_ioapic_from_
>   
>       idx = ioapic_id_to_index(IO_APIC_ID(apic));
>       if ( idx == MAX_IO_APICS )
> -        return -EINVAL;
> +        return val;
>   
>       offset = ioapic_sbdf[idx].pin_2_idx[pin];
>   
> @@ -422,9 +423,13 @@ unsigned int amd_iommu_read_ioapic_from_
>           u16 bdf = ioapic_sbdf[idx].bdf;
>           u16 seg = ioapic_sbdf[idx].seg;
>           u16 req_id = get_intremap_requestor_id(seg, bdf);
> -        union irte_ptr entry = get_intremap_entry(seg, req_id, offset);
> +        const struct amd_iommu *iommu = find_iommu_for_device(seg, bdf);
> +        union irte_ptr entry;
>   
> +        if ( !iommu )
> +            return val;
>           ASSERT(offset == (val & (INTREMAP_ENTRIES - 1)));
> +        entry = get_intremap_entry(iommu, req_id, offset);
>           val &= ~(INTREMAP_ENTRIES - 1);
>           val |= MASK_INSR(entry.ptr32->basic.int_type,
>                            IO_APIC_REDIR_DELIV_MODE_MASK);
> @@ -454,7 +459,7 @@ static int update_intremap_entry_from_ms
>           lock = get_intremap_lock(iommu->seg, req_id);
>           spin_lock_irqsave(lock, flags);
>           for ( i = 0; i < nr; ++i )
> -            free_intremap_entry(iommu->seg, req_id, *remap_index + i);
> +            free_intremap_entry(iommu, req_id, *remap_index + i);
>           spin_unlock_irqrestore(lock, flags);
>           goto done;
>       }
> @@ -479,8 +484,8 @@ static int update_intremap_entry_from_ms
>           *remap_index = offset;
>       }
>   
> -    entry = get_intremap_entry(iommu->seg, req_id, offset);
> -    update_intremap_entry(entry, vector, delivery_mode, dest_mode, dest);
> +    entry = get_intremap_entry(iommu, req_id, offset);
> +    update_intremap_entry(iommu, entry, vector, delivery_mode, dest_mode, dest);
>       spin_unlock_irqrestore(lock, flags);
>   
>       *data = (msg->data & ~(INTREMAP_ENTRIES - 1)) | offset;
> @@ -594,12 +599,13 @@ void amd_iommu_read_msi_from_ire(
>       const struct pci_dev *pdev = msi_desc->dev;
>       u16 bdf = pdev ? PCI_BDF2(pdev->bus, pdev->devfn) : hpet_sbdf.bdf;
>       u16 seg = pdev ? pdev->seg : hpet_sbdf.seg;
> +    const struct amd_iommu *iommu = _find_iommu_for_device(seg, bdf);
>       union irte_ptr entry;
>   
> -    if ( IS_ERR_OR_NULL(_find_iommu_for_device(seg, bdf)) )
> +    if ( IS_ERR_OR_NULL(iommu) )
>           return;
>   
> -    entry = get_intremap_entry(seg, get_dma_requestor_id(seg, bdf), offset);
> +    entry = get_intremap_entry(iommu, get_dma_requestor_id(seg, bdf), offset);
>   
>       if ( msi_desc->msi_attrib.type == PCI_CAP_ID_MSI )
>       {
> 

-- 
Brian Woods

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