iommu/amd: Remove PPR support

Remove PPR handler and notifier related functions as its not used
anymore. Note that we are retaining PPR interrupt handler support
as it will be re-used when we introduce IOPF support.

Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Tested-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://lore.kernel.org/r/20231006095706.5694-3-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

Author: hegdevasant

drivers/iommu/amd/amd_iommu.h

@@ -52,8 +52,6 @@ int amd_iommu_pc_set_reg(struct amd_iommu *iommu, u8 bank, u8 cntr,
 int amd_iommu_pdev_enable_cap_pri(struct pci_dev *pdev);
 void amd_iommu_pdev_disable_cap_pri(struct pci_dev *pdev);
 
-int amd_iommu_register_ppr_notifier(struct notifier_block *nb);
-int amd_iommu_unregister_ppr_notifier(struct notifier_block *nb);
 int amd_iommu_flush_page(struct iommu_domain *dom, u32 pasid, u64 address);
 void amd_iommu_update_and_flush_device_table(struct protection_domain *domain);
 void amd_iommu_domain_update(struct protection_domain *domain);

drivers/iommu/amd/amd_iommu_types.h

@@ -509,19 +509,6 @@ extern struct kmem_cache *amd_iommu_irq_cache;
 #define APERTURE_RANGE_INDEX(a)	((a) >> APERTURE_RANGE_SHIFT)
 #define APERTURE_PAGE_INDEX(a)	(((a) >> 21) & 0x3fULL)
 
-/*
- * This struct is used to pass information about
- * incoming PPR faults around.
- */
-struct amd_iommu_fault {
-	u64 address;    /* IO virtual address of the fault*/
-	u32 pasid;      /* Address space identifier */
-	u32 sbdf;	/* Originating PCI device id */
-	u16 tag;        /* PPR tag */
-	u16 flags;      /* Fault flags */
-
-};
-
 
 struct amd_iommu;
 struct iommu_domain;

drivers/iommu/amd/iommu.c

@@ -64,7 +64,6 @@ LIST_HEAD(acpihid_map);
 
 const struct iommu_ops amd_iommu_ops;
 
-static ATOMIC_NOTIFIER_HEAD(ppr_notifier);
 int amd_iommu_max_glx_val = -1;
 
 /*
@@ -815,24 +814,6 @@ static void iommu_poll_events(struct amd_iommu *iommu)
 	writel(head, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
 }
 
-static void iommu_handle_ppr_entry(struct amd_iommu *iommu, u64 *raw)
-{
-	struct amd_iommu_fault fault;
-
-	if (PPR_REQ_TYPE(raw[0]) != PPR_REQ_FAULT) {
-		pr_err_ratelimited("Unknown PPR request received\n");
-		return;
-	}
-
-	fault.address   = raw[1];
-	fault.pasid     = PPR_PASID(raw[0]);
-	fault.sbdf      = PCI_SEG_DEVID_TO_SBDF(iommu->pci_seg->id, PPR_DEVID(raw[0]));
-	fault.tag       = PPR_TAG(raw[0]);
-	fault.flags     = PPR_FLAGS(raw[0]);
-
-	atomic_notifier_call_chain(&ppr_notifier, 0, &fault);
-}
-
 static void iommu_poll_ppr_log(struct amd_iommu *iommu)
 {
 	u32 head, tail;
@@ -878,8 +859,7 @@ static void iommu_poll_ppr_log(struct amd_iommu *iommu)
 		head = (head + PPR_ENTRY_SIZE) % PPR_LOG_SIZE;
 		writel(head, iommu->mmio_base + MMIO_PPR_HEAD_OFFSET);
 
-		/* Handle PPR entry */
-		iommu_handle_ppr_entry(iommu, entry);
+		/* TODO: PPR Handler will be added when we add IOPF support */
 
 		/* Refresh ring-buffer information */
 		head = readl(iommu->mmio_base + MMIO_PPR_HEAD_OFFSET);
@@ -2545,29 +2525,6 @@ const struct iommu_ops amd_iommu_ops = {
 	}
 };
 
-/*****************************************************************************
- *
- * The next functions do a basic initialization of IOMMU for pass through
- * mode
- *
- * In passthrough mode the IOMMU is initialized and enabled but not used for
- * DMA-API translation.
- *
- *****************************************************************************/
-
-/* IOMMUv2 specific functions */
-int amd_iommu_register_ppr_notifier(struct notifier_block *nb)
-{
-	return atomic_notifier_chain_register(&ppr_notifier, nb);
-}
-EXPORT_SYMBOL(amd_iommu_register_ppr_notifier);
-
-int amd_iommu_unregister_ppr_notifier(struct notifier_block *nb)
-{
-	return atomic_notifier_chain_unregister(&ppr_notifier, nb);
-}
-EXPORT_SYMBOL(amd_iommu_unregister_ppr_notifier);
-
 static int __flush_pasid(struct protection_domain *domain, u32 pasid,
 			 u64 address, bool size)
 {