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Commit db91dc59 authored by Mitchel Humpherys's avatar Mitchel Humpherys
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iommu/iommu-debug: Set DOMAIN_ATTR_ATOMIC during profiling 



There's some non-deterministic latency incurred by enabling clocks and
regulators.  Clocks and regulators are left on for atomic domains, which
makes them a good choice for profiling the page table management code.
Use an atomic domain for map/unmap profiling to make things more
deterministic.

Change-Id: Ib9fa48699c9d6009dd3f3b322002e2fb0f2ff99c
Signed-off-by: default avatarMitchel Humpherys <mitchelh@codeaurora.org>
parent 66c068c9

drivers/iommu/iommu-debug.c

+8 −1
Original line number Diff line number Diff line
@@ -317,7 +317,7 @@ static void iommu_debug_device_profiling(struct seq_file *s, struct device *dev) 
	struct bus_type *bus;

	unsigned long iova = 0x10000;

	phys_addr_t paddr = 0xa000;

	int htw_disable = 1;

	int htw_disable = 1, atomic_domain = 1;



	bus = msm_iommu_get_bus(dev);

	if (!bus)
@@ -335,6 +335,13 @@ static void iommu_debug_device_profiling(struct seq_file *s, struct device *dev) 
		goto out_domain_free;

	}



	if (iommu_domain_set_attr(domain, DOMAIN_ATTR_ATOMIC,

				  &atomic_domain)) {

		seq_printf(s, "Couldn't set atomic_domain to %d\n",

			   atomic_domain);

		goto out_domain_free;

	}



	if (iommu_attach_device(domain, dev)) {

		seq_puts(s,

			 "Couldn't attach new domain to device. Is it already attached?\n");