Merge "iommu: iommu-debug: Add support for page table dump" (71c32b6e) · Commits · e / devices / android_kernel_oneplus_sm7250

drivers/iommu/Kconfig

+1 −0

Original line number	Diff line number	Diff line
		@@ -498,6 +498,7 @@ config IOMMU_DEBUG_TRACKING
		config IOMMU_TESTS
		bool "Interactive IOMMU performance/functional tests"
		select IOMMU_API
		select ARM64_PTDUMP_CORE
		help
		Enables a suite of IOMMU unit tests. The tests are runnable
		through debugfs. Unlike the IOMMU_DEBUG_TRACKING option, the

drivers/iommu/iommu-debug.c

+53 −0

Original line number	Diff line number	Diff line
		@@ -31,6 +31,10 @@
		#include <asm/cacheflush.h>
		#include <asm/dma-iommu.h>

		#ifdef CONFIG_ARM64_PTDUMP_CORE
		#include <asm/ptdump.h>
		#endif

		#if defined(CONFIG_IOMMU_TESTS)

		static const char *iommu_debug_attr_to_string(enum iommu_attr attr)
		@@ -177,6 +181,9 @@ struct iommu_debug_device {
		unsigned int clk_count;
		/* Protects domain */
		struct mutex state_lock;
		#ifdef CONFIG_ARM64_PTDUMP_CORE
		struct ptdump_info pt_info;
		#endif
		};

		static int iommu_debug_build_phoney_sg_table(struct device *dev,
		@@ -2081,6 +2088,43 @@ static const struct file_operations iommu_debug_trigger_fault_fops = {
		.write = iommu_debug_trigger_fault_write,
		};

		#ifdef CONFIG_ARM64_PTDUMP_CORE
		static int ptdump_show(struct seq_file s, void v)
		{
		struct iommu_debug_device *ddev = s->private;
		struct ptdump_info *info = &(ddev->pt_info);
		struct mm_struct mm;
		phys_addr_t phys;

		info->markers = (struct addr_marker[]){
		{ 0, "start" },
		};
		info->base_addr = 0;
		info->mm = &mm;

		if (ddev->domain) {
		iommu_domain_get_attr(ddev->domain, DOMAIN_ATTR_PT_BASE_ADDR,
		&(phys));

		info->mm->pgd = (pgd_t *)phys_to_virt(phys);
		ptdump_walk_pgd(s, info);
		}
		return 0;
		}

		static int ptdump_open(struct inode inode, struct file file)
		{
		return single_open(file, ptdump_show, inode->i_private);
		}

		static const struct file_operations ptdump_fops = {
		.open = ptdump_open,
		.read = seq_read,
		.llseek = seq_lseek,
		.release = single_release,
		};
		#endif

		/*
		* The following will only work for drivers that implement the generic
		* device tree bindings described in
		@@ -2255,6 +2299,15 @@ static int snarf_iommu_devices(struct device dev, void ignored)
		goto err_rmdir;
		}

		#ifdef CONFIG_ARM64_PTDUMP_CORE
		if (!debugfs_create_file("iommu_page_tables", 0200, dir, ddev,
		&ptdump_fops)) {
		pr_err_ratelimited("Couldn't create iommu/devices/%s/trigger-fault debugfs file\n",
		dev_name(dev));
		goto err_rmdir;
		}
		#endif

		list_add(&ddev->list, &iommu_debug_devices);
		return 0;