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Commit 7f26508b authored by Joerg Roedel's avatar Joerg Roedel
Browse files

AMD IOMMU: add init code for statistic collection 



Impact: create a new debugfs directory

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent a9dddbe0

arch/x86/include/asm/amd_iommu_types.h

+2 −0
Original line number Original line Diff line number Diff line
@@ -420,6 +420,8 @@ struct __iommu_counter { 
#define ADD_STATS_COUNTER(name, x)

#define ADD_STATS_COUNTER(name, x)

#define SUB_STATS_COUNTER(name, x)

#define SUB_STATS_COUNTER(name, x)





static inline void amd_iommu_stats_init(void) { }



#endif /* CONFIG_AMD_IOMMU_STATS */

#endif /* CONFIG_AMD_IOMMU_STATS */





#endif /* _ASM_X86_AMD_IOMMU_TYPES_H */
 
#endif /* _ASM_X86_AMD_IOMMU_TYPES_H */

arch/x86/kernel/amd_iommu.c

+37 −0
Original line number Original line Diff line number Diff line
@@ -20,6 +20,7 @@ 
#include <linux/pci.h>

#include <linux/pci.h>

#include <linux/gfp.h>

#include <linux/gfp.h>

#include <linux/bitops.h>

#include <linux/bitops.h>

#include <linux/debugfs.h>

#include <linux/scatterlist.h>

#include <linux/scatterlist.h>

#include <linux/iommu-helper.h>

#include <linux/iommu-helper.h>

#ifdef CONFIG_IOMMU_API

#ifdef CONFIG_IOMMU_API
@@ -57,6 +58,40 @@ static int dma_ops_unity_map(struct dma_ops_domain *dma_dom, 
static struct dma_ops_domain *find_protection_domain(u16 devid);

static struct dma_ops_domain *find_protection_domain(u16 devid);









#ifdef CONFIG_AMD_IOMMU_STATS



/*

 * Initialization code for statistics collection

 */



static struct dentry *stats_dir;

static struct dentry *de_isolate;

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_isolate = debugfs_create_bool("isolation", 0444, stats_dir,

					 (u32 *)&amd_iommu_isolate);



	de_fflush  = debugfs_create_bool("fullflush", 0444, stats_dir,

					 (u32 *)&amd_iommu_unmap_flush);

}



#endif



/* returns !0 if the IOMMU is caching non-present entries in its TLB */

/* returns !0 if the IOMMU is caching non-present entries in its TLB */

static int iommu_has_npcache(struct amd_iommu *iommu)

static int iommu_has_npcache(struct amd_iommu *iommu)

{

{
@@ -1620,6 +1655,8 @@ int __init amd_iommu_init_dma_ops(void) 




	bus_register_notifier(&pci_bus_type, &device_nb);

	bus_register_notifier(&pci_bus_type, &device_nb);





	amd_iommu_stats_init();



	return 0;

	return 0;





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