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Commit da49f6df authored by Joerg Roedel's avatar Joerg Roedel
Browse files

AMD IOMMU: add stats counter for completion wait events 



Impact: see number of completion wait events in debugfs

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent 7f26508b

arch/x86/kernel/amd_iommu.c

+6 −0
Original line number Original line Diff line number Diff line
@@ -64,6 +64,8 @@ static struct dma_ops_domain *find_protection_domain(u16 devid); 
 * Initialization code for statistics collection

 * Initialization code for statistics collection

 */

 */





DECLARE_STATS_COUNTER(compl_wait);



static struct dentry *stats_dir;

static struct dentry *stats_dir;

static struct dentry *de_isolate;

static struct dentry *de_isolate;

static struct dentry *de_fflush;

static struct dentry *de_fflush;
@@ -88,6 +90,8 @@ static void amd_iommu_stats_init(void) 




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

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

					 (u32 *)&amd_iommu_unmap_flush);

					 (u32 *)&amd_iommu_unmap_flush);



	amd_iommu_stats_add(&compl_wait);

}

}





#endif

#endif
@@ -249,6 +253,8 @@ static void __iommu_wait_for_completion(struct amd_iommu *iommu) 
	unsigned status = 0;

	unsigned status = 0;

	unsigned long i = 0;

	unsigned long i = 0;





	INC_STATS_COUNTER(compl_wait);



	while (!ready && (i < EXIT_LOOP_COUNT)) {

	while (!ready && (i < EXIT_LOOP_COUNT)) {

		++i;

		++i;

		/* wait for the bit to become one */

		/* wait for the bit to become one */