iommu/amd: Remove statistics code

The statistics are not really used for anything and should
be replaced by generic and per-device statistic counters.
Remove the code for now.

Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/Kconfig

@@ -124,16 +124,6 @@ config AMD_IOMMU
 	  your BIOS for an option to enable it or if you have an IVRS ACPI
 	  table.
 
-config AMD_IOMMU_STATS
-	bool "Export AMD IOMMU statistics to debugfs"
-	depends on AMD_IOMMU
-	select DEBUG_FS
-	---help---
-	  This option enables code in the AMD IOMMU driver to collect various
-	  statistics about whats happening in the driver and exports that
-	  information to userspace via debugfs.
-	  If unsure, say N.
-
 config AMD_IOMMU_V2
 	tristate "AMD IOMMU Version 2 driver"
 	depends on AMD_IOMMU

drivers/iommu/amd_iommu.c

@@ -489,70 +489,6 @@ static void iommu_uninit_device(struct device *dev)
 	 */
 }
 
-#ifdef CONFIG_AMD_IOMMU_STATS
-
-/*
- * Initialization code for statistics collection
- */
-
-DECLARE_STATS_COUNTER(compl_wait);
-DECLARE_STATS_COUNTER(cnt_map_single);
-DECLARE_STATS_COUNTER(cnt_unmap_single);
-DECLARE_STATS_COUNTER(cnt_map_sg);
-DECLARE_STATS_COUNTER(cnt_unmap_sg);
-DECLARE_STATS_COUNTER(cnt_alloc_coherent);
-DECLARE_STATS_COUNTER(cnt_free_coherent);
-DECLARE_STATS_COUNTER(cross_page);
-DECLARE_STATS_COUNTER(domain_flush_single);
-DECLARE_STATS_COUNTER(domain_flush_all);
-DECLARE_STATS_COUNTER(alloced_io_mem);
-DECLARE_STATS_COUNTER(total_map_requests);
-DECLARE_STATS_COUNTER(complete_ppr);
-DECLARE_STATS_COUNTER(invalidate_iotlb);
-DECLARE_STATS_COUNTER(invalidate_iotlb_all);
-DECLARE_STATS_COUNTER(pri_requests);
-
-static struct dentry *stats_dir;
-static struct dentry *de_fflush;
-
-static void amd_iommu_stats_add(struct __iommu_counter *cnt)
-{
-	if (stats_dir == NULL)
-		return;
-
-	cnt->dent = debugfs_create_u64(cnt->name, 0444, stats_dir,
-				       &cnt->value);
-}
-
-static void amd_iommu_stats_init(void)
-{
-	stats_dir = debugfs_create_dir("amd-iommu", NULL);
-	if (stats_dir == NULL)
-		return;
-
-	de_fflush  = debugfs_create_bool("fullflush", 0444, stats_dir,
-					 &amd_iommu_unmap_flush);
-
-	amd_iommu_stats_add(&compl_wait);
-	amd_iommu_stats_add(&cnt_map_single);
-	amd_iommu_stats_add(&cnt_unmap_single);
-	amd_iommu_stats_add(&cnt_map_sg);
-	amd_iommu_stats_add(&cnt_unmap_sg);
-	amd_iommu_stats_add(&cnt_alloc_coherent);
-	amd_iommu_stats_add(&cnt_free_coherent);
-	amd_iommu_stats_add(&cross_page);
-	amd_iommu_stats_add(&domain_flush_single);
-	amd_iommu_stats_add(&domain_flush_all);
-	amd_iommu_stats_add(&alloced_io_mem);
-	amd_iommu_stats_add(&total_map_requests);
-	amd_iommu_stats_add(&complete_ppr);
-	amd_iommu_stats_add(&invalidate_iotlb);
-	amd_iommu_stats_add(&invalidate_iotlb_all);
-	amd_iommu_stats_add(&pri_requests);
-}
-
-#endif
-
 /****************************************************************************
  *
  * Interrupt handling functions
@@ -675,8 +611,6 @@ static void iommu_handle_ppr_entry(struct amd_iommu *iommu, u64 *raw)
 {
 	struct amd_iommu_fault fault;
 
-	INC_STATS_COUNTER(pri_requests);
-
 	if (PPR_REQ_TYPE(raw[0]) != PPR_REQ_FAULT) {
 		pr_err_ratelimited("AMD-Vi: Unknown PPR request received\n");
 		return;
@@ -2641,11 +2575,6 @@ static dma_addr_t __map_single(struct device *dev,
 	pages = iommu_num_pages(paddr, size, PAGE_SIZE);
 	paddr &= PAGE_MASK;
 
-	INC_STATS_COUNTER(total_map_requests);
-
-	if (pages > 1)
-		INC_STATS_COUNTER(cross_page);
-
 	if (align)
 		align_mask = (1UL << get_order(size)) - 1;
 
@@ -2666,8 +2595,6 @@ static dma_addr_t __map_single(struct device *dev,
 	}
 	address += offset;
 
-	ADD_STATS_COUNTER(alloced_io_mem, size);
-
 	if (unlikely(amd_iommu_np_cache)) {
 		domain_flush_pages(&dma_dom->domain, address, size);
 		domain_flush_complete(&dma_dom->domain);
@@ -2715,8 +2642,6 @@ static void __unmap_single(struct dma_ops_domain *dma_dom,
 		start += PAGE_SIZE;
 	}
 
-	SUB_STATS_COUNTER(alloced_io_mem, size);
-
 	dma_ops_free_addresses(dma_dom, dma_addr, pages);
 }
 
@@ -2732,8 +2657,6 @@ static dma_addr_t map_page(struct device *dev, struct page *page,
 	struct protection_domain *domain;
 	u64 dma_mask;
 
-	INC_STATS_COUNTER(cnt_map_single);
-
 	domain = get_domain(dev);
 	if (PTR_ERR(domain) == -EINVAL)
 		return (dma_addr_t)paddr;
@@ -2754,8 +2677,6 @@ static void unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
 {
 	struct protection_domain *domain;
 
-	INC_STATS_COUNTER(cnt_unmap_single);
-
 	domain = get_domain(dev);
 	if (IS_ERR(domain))
 		return;
@@ -2778,8 +2699,6 @@ static int map_sg(struct device *dev, struct scatterlist *sglist,
 	int mapped_elems = 0;
 	u64 dma_mask;
 
-	INC_STATS_COUNTER(cnt_map_sg);
-
 	domain = get_domain(dev);
 	if (IS_ERR(domain))
 		return 0;
@@ -2825,8 +2744,6 @@ static void unmap_sg(struct device *dev, struct scatterlist *sglist,
 	struct scatterlist *s;
 	int i;
 
-	INC_STATS_COUNTER(cnt_unmap_sg);
-
 	domain = get_domain(dev);
 	if (IS_ERR(domain))
 		return;
@@ -2849,8 +2766,6 @@ static void *alloc_coherent(struct device *dev, size_t size,
 	struct protection_domain *domain;
 	struct page *page;
 
-	INC_STATS_COUNTER(cnt_alloc_coherent);
-
 	domain = get_domain(dev);
 	if (PTR_ERR(domain) == -EINVAL) {
 		page = alloc_pages(flag, get_order(size));
@@ -2904,8 +2819,6 @@ static void free_coherent(struct device *dev, size_t size,
 	struct protection_domain *domain;
 	struct page *page;
 
-	INC_STATS_COUNTER(cnt_free_coherent);
-
 	page = virt_to_page(virt_addr);
 	size = PAGE_ALIGN(size);
 
@@ -2997,8 +2910,6 @@ int __init amd_iommu_init_dma_ops(void)
 	if (!swiotlb)
 		dma_ops = &nommu_dma_ops;
 
-	amd_iommu_stats_init();
-
 	if (amd_iommu_unmap_flush)
 		pr_info("AMD-Vi: IO/TLB flush on unmap enabled\n");
 	else
@@ -3489,8 +3400,6 @@ out:
 static int __amd_iommu_flush_page(struct protection_domain *domain, int pasid,
 				  u64 address)
 {
-	INC_STATS_COUNTER(invalidate_iotlb);
-
 	return __flush_pasid(domain, pasid, address, false);
 }
 
@@ -3511,8 +3420,6 @@ EXPORT_SYMBOL(amd_iommu_flush_page);
 
 static int __amd_iommu_flush_tlb(struct protection_domain *domain, int pasid)
 {
-	INC_STATS_COUNTER(invalidate_iotlb_all);
-
 	return __flush_pasid(domain, pasid, CMD_INV_IOMMU_ALL_PAGES_ADDRESS,
 			     true);
 }
@@ -3632,8 +3539,6 @@ int amd_iommu_complete_ppr(struct pci_dev *pdev, int pasid,
 	struct amd_iommu *iommu;
 	struct iommu_cmd cmd;
 
-	INC_STATS_COUNTER(complete_ppr);
-
 	dev_data = get_dev_data(&pdev->dev);
 	iommu    = amd_iommu_rlookup_table[dev_data->devid];
 

drivers/iommu/amd_iommu_types.h

@@ -682,30 +682,4 @@ static inline int get_hpet_devid(int id)
 	return -EINVAL;
 }
 
-#ifdef CONFIG_AMD_IOMMU_STATS
-
-struct __iommu_counter {
-	char *name;
-	struct dentry *dent;
-	u64 value;
-};
-
-#define DECLARE_STATS_COUNTER(nm) \
-	static struct __iommu_counter nm = {	\
-		.name = #nm,			\
-	}
-
-#define INC_STATS_COUNTER(name)		name.value += 1
-#define ADD_STATS_COUNTER(name, x)	name.value += (x)
-#define SUB_STATS_COUNTER(name, x)	name.value -= (x)
-
-#else /* CONFIG_AMD_IOMMU_STATS */
-
-#define DECLARE_STATS_COUNTER(name)
-#define INC_STATS_COUNTER(name)
-#define ADD_STATS_COUNTER(name, x)
-#define SUB_STATS_COUNTER(name, x)
-
-#endif /* CONFIG_AMD_IOMMU_STATS */
-
 #endif /* _ASM_X86_AMD_IOMMU_TYPES_H */