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    SubjectRe: [PATCH v3 4/5] iommu/ioasid: Rename INVALID_IOASID
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    Hi, Jacob,

    On 2/16/23 15:59, Jacob Pan wrote:
    > INVALID_IOASID and IOMMU_PASID_INVALID are duplicated. Rename
    > INVALID_IOASID and consolidate since we are moving away from IOASID
    > infrastructure.
    >
    > Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
    > ---
    > Documentation/x86/sva.rst | 2 +-
    > arch/x86/kernel/traps.c | 5 ++++-
    > drivers/dma/idxd/device.c | 8 ++++----
    > drivers/dma/idxd/idxd.h | 1 +
    > drivers/dma/idxd/init.c | 2 +-
    > drivers/dma/idxd/irq.c | 2 +-
    > drivers/iommu/intel/dmar.c | 4 ++--
    > drivers/iommu/intel/iommu.c | 2 +-
    > drivers/iommu/intel/svm.c | 2 +-
    > drivers/iommu/iommu-sva.c | 2 +-
    > include/linux/ioasid.h | 4 ----
    > include/linux/iommu.h | 6 +++++-
    > mm/init-mm.c | 4 ++--
    > 13 files changed, 24 insertions(+), 20 deletions(-)
    >
    > diff --git a/Documentation/x86/sva.rst b/Documentation/x86/sva.rst
    > index 2e9b8b0f9a0f..33cb05005982 100644
    > --- a/Documentation/x86/sva.rst
    > +++ b/Documentation/x86/sva.rst
    > @@ -107,7 +107,7 @@ process share the same page tables, thus the same MSR value.
    > PASID Life Cycle Management
    > ===========================
    >
    > -PASID is initialized as INVALID_IOASID (-1) when a process is created.
    > +PASID is initialized as IOMMU_PASID_INVALID (-1) when a process is created.
    >
    > Only processes that access SVA-capable devices need to have a PASID
    > allocated. This allocation happens when a process opens/binds an SVA-capable
    > diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
    > index d317dc3d06a3..d6fb03ebf548 100644
    > --- a/arch/x86/kernel/traps.c
    > +++ b/arch/x86/kernel/traps.c
    > @@ -40,7 +40,10 @@
    > #include <linux/io.h>
    > #include <linux/hardirq.h>
    > #include <linux/atomic.h>
    > -#include <linux/ioasid.h>
    > +
    > +#ifdef CONFIG_IOMMU_SVA
    > +#include <linux/iommu.h>
    > +#endif
    >
    > #include <asm/stacktrace.h>
    > #include <asm/processor.h>
    > diff --git a/drivers/dma/idxd/device.c b/drivers/dma/idxd/device.c
    > index 29dbb0f52e18..125652a8bb29 100644
    > --- a/drivers/dma/idxd/device.c
    > +++ b/drivers/dma/idxd/device.c
    > @@ -1194,7 +1194,7 @@ static void idxd_device_set_perm_entry(struct idxd_device *idxd,
    > {
    > union msix_perm mperm;
    >
    > - if (ie->pasid == INVALID_IOASID)
    > + if (ie->pasid == IOMMU_PASID_INVALID)
    > return;
    >
    > mperm.bits = 0;
    > @@ -1224,7 +1224,7 @@ void idxd_wq_free_irq(struct idxd_wq *wq)
    > idxd_device_clear_perm_entry(idxd, ie);
    > ie->vector = -1;
    > ie->int_handle = INVALID_INT_HANDLE;
    > - ie->pasid = INVALID_IOASID;
    > + ie->pasid = IOMMU_PASID_INVALID;
    > }
    >
    > int idxd_wq_request_irq(struct idxd_wq *wq)
    > @@ -1240,7 +1240,7 @@ int idxd_wq_request_irq(struct idxd_wq *wq)
    >
    > ie = &wq->ie;
    > ie->vector = pci_irq_vector(pdev, ie->id);
    > - ie->pasid = device_pasid_enabled(idxd) ? idxd->pasid : INVALID_IOASID;
    > + ie->pasid = device_pasid_enabled(idxd) ? idxd->pasid : IOMMU_PASID_INVALID;
    > idxd_device_set_perm_entry(idxd, ie);
    >
    > rc = request_threaded_irq(ie->vector, NULL, idxd_wq_thread, 0, "idxd-portal", ie);
    > @@ -1265,7 +1265,7 @@ int idxd_wq_request_irq(struct idxd_wq *wq)
    > free_irq(ie->vector, ie);
    > err_irq:
    > idxd_device_clear_perm_entry(idxd, ie);
    > - ie->pasid = INVALID_IOASID;
    > + ie->pasid = IOMMU_PASID_INVALID;
    > return rc;
    > }
    >
    > diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h
    > index 7ced8d283d98..417e602a46b6 100644
    > --- a/drivers/dma/idxd/idxd.h
    > +++ b/drivers/dma/idxd/idxd.h
    > @@ -13,6 +13,7 @@
    > #include <linux/ioasid.h>
    > #include <linux/bitmap.h>
    > #include <linux/perf_event.h>
    > +#include <linux/iommu.h>
    > #include <uapi/linux/idxd.h>
    > #include "registers.h"
    >
    > diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c
    > index 529ea09c9094..f30eef701970 100644
    > --- a/drivers/dma/idxd/init.c
    > +++ b/drivers/dma/idxd/init.c
    > @@ -105,7 +105,7 @@ static int idxd_setup_interrupts(struct idxd_device *idxd)
    > ie = idxd_get_ie(idxd, msix_idx);
    > ie->id = msix_idx;
    > ie->int_handle = INVALID_INT_HANDLE;
    > - ie->pasid = INVALID_IOASID;
    > + ie->pasid = IOMMU_PASID_INVALID;
    >
    > spin_lock_init(&ie->list_lock);
    > init_llist_head(&ie->pending_llist);
    > diff --git a/drivers/dma/idxd/irq.c b/drivers/dma/idxd/irq.c
    > index aa314ebec587..242f1f0b9f09 100644
    > --- a/drivers/dma/idxd/irq.c
    > +++ b/drivers/dma/idxd/irq.c
    > @@ -80,7 +80,7 @@ static void idxd_int_handle_revoke_drain(struct idxd_irq_entry *ie)
    > desc.opcode = DSA_OPCODE_DRAIN;
    > desc.priv = 1;
    >
    > - if (ie->pasid != INVALID_IOASID)
    > + if (ie->pasid != IOMMU_PASID_INVALID)

    It's better to change to:
    + if (pasid_valid(ie->paid))

    If pasid_vaild() is called, any invalid PASID value change in the future
    will be hidden in pasid_valid() and won't impact this code any more.

    And checking pasid_valid() is more readable and meaninful than direct
    checking the invalid PASID value.

    > desc.pasid = ie->pasid;
    > desc.int_handle = ie->int_handle;
    > portal = idxd_wq_portal_addr(wq);
    > diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c
    > index bf0bfe5ba7a7..c567f94b66c7 100644
    > --- a/drivers/iommu/intel/dmar.c
    > +++ b/drivers/iommu/intel/dmar.c
    > @@ -1933,7 +1933,7 @@ static int dmar_fault_do_one(struct intel_iommu *iommu, int type,
    > return 0;
    > }
    >
    > - if (pasid == INVALID_IOASID)
    > + if (pasid == IOMMU_PASID_INVALID)

    Ditto.

    > pr_err("[%s NO_PASID] Request device [%02x:%02x.%d] fault addr 0x%llx [fault reason 0x%02x] %s\n",
    > type ? "DMA Read" : "DMA Write",
    > source_id >> 8, PCI_SLOT(source_id & 0xFF),
    > @@ -2014,7 +2014,7 @@ irqreturn_t dmar_fault(int irq, void *dev_id)
    > if (!ratelimited)
    > /* Using pasid -1 if pasid is not present */
    > dmar_fault_do_one(iommu, type, fault_reason,
    > - pasid_present ? pasid : INVALID_IOASID,
    > + pasid_present ? pasid : IOMMU_PASID_INVALID,
    > source_id, guest_addr);
    >
    > fault_index++;
    > diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
    > index a295e80fdfe8..10f657828d3a 100644
    > --- a/drivers/iommu/intel/iommu.c
    > +++ b/drivers/iommu/intel/iommu.c
    > @@ -876,7 +876,7 @@ void dmar_fault_dump_ptes(struct intel_iommu *iommu, u16 source_id,
    > return;
    > }
    > /* For request-without-pasid, get the pasid from context entry */
    > - if (intel_iommu_sm && pasid == INVALID_IOASID)
    > + if (intel_iommu_sm && pasid == IOMMU_PASID_INVALID)

    Ditto.

    > pasid = PASID_RID2PASID;
    >
    > dir_index = pasid >> PASID_PDE_SHIFT;
    > diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
    > index c76b66263467..be98af2fce06 100644
    > --- a/drivers/iommu/intel/svm.c
    > +++ b/drivers/iommu/intel/svm.c
    > @@ -274,7 +274,7 @@ static int pasid_to_svm_sdev(struct device *dev, unsigned int pasid,
    > if (WARN_ON(!mutex_is_locked(&pasid_mutex)))
    > return -EINVAL;
    >
    > - if (pasid == INVALID_IOASID || pasid >= PASID_MAX)
    > + if (pasid == IOMMU_PASID_INVALID || pasid >= PASID_MAX)
    > return -EINVAL;
    >
    > svm = pasid_private_find(pasid);
    > diff --git a/drivers/iommu/iommu-sva.c b/drivers/iommu/iommu-sva.c
    > index 17821ad5bf9b..1f1b4d680ede 100644
    > --- a/drivers/iommu/iommu-sva.c
    > +++ b/drivers/iommu/iommu-sva.c
    > @@ -41,7 +41,7 @@ static int iommu_sva_alloc_pasid(struct mm_struct *mm, ioasid_t min, ioasid_t ma
    >
    > void mm_pasid_init(struct mm_struct *mm)
    > {
    > - mm->pasid = INVALID_IOASID;
    > + mm->pasid = IOMMU_PASID_INVALID;
    > }
    >
    > /* Associate a PASID with an mm_struct: */
    > diff --git a/include/linux/ioasid.h b/include/linux/ioasid.h
    > index af1c9d62e642..9ef22552376c 100644
    > --- a/include/linux/ioasid.h
    > +++ b/include/linux/ioasid.h
    > @@ -40,10 +40,6 @@ void *ioasid_find(struct ioasid_set *set, ioasid_t ioasid,
    > int ioasid_register_allocator(struct ioasid_allocator_ops *allocator);
    > void ioasid_unregister_allocator(struct ioasid_allocator_ops *allocator);
    > int ioasid_set_data(ioasid_t ioasid, void *data);
    > -static inline bool pasid_valid(ioasid_t ioasid)
    > -{
    > - return ioasid != INVALID_IOASID;
    > -}
    >
    > #else /* !CONFIG_IOASID */
    > static inline ioasid_t ioasid_alloc(struct ioasid_set *set, ioasid_t min,
    > diff --git a/include/linux/iommu.h b/include/linux/iommu.h
    > index 46e1347bfa22..f04d3f05784a 100644
    > --- a/include/linux/iommu.h
    > +++ b/include/linux/iommu.h
    > @@ -193,7 +193,11 @@ enum iommu_dev_features {
    > };
    >
    > #define IOMMU_PASID_INVALID (-1U)
    > -
    > +typedef unsigned int ioasid_t;
    > +static inline bool pasid_valid(ioasid_t ioasid)
    > +{
    > + return ioasid != IOMMU_PASID_INVALID;
    > +}
    > #ifdef CONFIG_IOMMU_API
    >
    > /**
    > diff --git a/mm/init-mm.c b/mm/init-mm.c
    > index c9327abb771c..a084039f55d8 100644
    > --- a/mm/init-mm.c
    > +++ b/mm/init-mm.c
    > @@ -10,7 +10,7 @@
    >
    > #include <linux/atomic.h>
    > #include <linux/user_namespace.h>
    > -#include <linux/ioasid.h>
    > +#include <linux/iommu.h>
    > #include <asm/mmu.h>
    >
    > #ifndef INIT_MM_CONTEXT
    > @@ -40,7 +40,7 @@ struct mm_struct init_mm = {
    > .user_ns = &init_user_ns,
    > .cpu_bitmap = CPU_BITS_NONE,
    > #ifdef CONFIG_IOMMU_SVA
    > - .pasid = INVALID_IOASID,
    > + .pasid = IOMMU_PASID_INVALID,
    > #endif
    > INIT_MM_CONTEXT(init_mm)
    > };

    Thanks.

    -Fenghua

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