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iommu: Refactor IOMMU pagetable page accounting into a config option

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Refactor IOMMU pagetable page accounting code into a config option
so that it only includes additional headers in configurations where
the page accounting feature is needed. Doing so prevents the
definition of certain structures from being expanded, which can
affect the CRC value generated for exported symbols in module.symvers.

Change-Id: Idd6fc0e1cbb46ace211971ac142be491d0a5ab09
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
This commit is contained in:
Isaac J. Manjarres 2020-06-23 23:31:55 -07:00
commit f759692d36
2 changed files with 47 additions and 28 deletions
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9
drivers/iommu/Kconfig
View file

@ -172,6 +172,15 @@ config IOMMU_DEBUGFS
debug/iommu directory, and then populate a subdirectory with
entries as required.
config IO_PGTABLE_PAGE_ACCOUNTING
bool "Export the number of pages allocated for IOMMU pagetables"
depends on IOMMU_DEBUGFS && QGKI
help
Allows exposure of the number of pages allocated for IOMMU
pagetables through DebugFS. This is particularly useful for
generating stats about the amount of memory consumed by IOMMU
page tables in the system. If unsure, say N here.
config IOMMU_DEFAULT_PASSTHROUGH
bool "IOMMU passthrough by default"
depends on IOMMU_API

66
drivers/iommu/io-pgtable.c
View file

@ -11,10 +11,12 @@
#include <linux/io-pgtable.h>
#include <linux/kernel.h>
#include <linux/types.h>
#ifdef CONFIG_IO_PGTABLE_PAGE_ACCOUNTING
#include <linux/iommu.h>
#include <linux/debugfs.h>
#include <linux/atomic.h>
#include <linux/module.h>
#endif
static const struct io_pgtable_init_fns *
io_pgtable_init_table[IO_PGTABLE_NUM_FMTS] = {
@ -33,8 +35,6 @@ io_pgtable_init_table[IO_PGTABLE_NUM_FMTS] = {
#endif
};
static struct dentry *io_pgtable_top;
struct io_pgtable_ops *alloc_io_pgtable_ops(enum io_pgtable_fmt fmt,
struct io_pgtable_cfg *cfg,
void *cookie)
@ -78,8 +78,42 @@ void free_io_pgtable_ops(struct io_pgtable_ops *ops)
}
EXPORT_SYMBOL_GPL(free_io_pgtable_ops);
#ifdef CONFIG_IO_PGTABLE_PAGE_ACCOUNTING
static struct dentry *io_pgtable_top;
static atomic_t pages_allocated;
static int io_pgtable_init(void)
{
io_pgtable_top = debugfs_create_dir("io-pgtable", iommu_debugfs_top);
if (!io_pgtable_top)
return -ENODEV;
if (!debugfs_create_atomic_t("pages", 0600, io_pgtable_top,
&pages_allocated)) {
debugfs_remove_recursive(io_pgtable_top);
return -ENODEV;
}
return 0;
}
module_init(io_pgtable_init);
static void io_pgtable_exit(void)
{
debugfs_remove_recursive(io_pgtable_top);
}
module_exit(io_pgtable_exit);
static void mod_pages_allocated(int nr_pages)
{
atomic_add(nr_pages, &pages_allocated);
}
#else
static void mod_pages_allocated(int nr_pages)
{
}
#endif
void *io_pgtable_alloc_pages_exact(struct io_pgtable_cfg *cfg, void *cookie,
size_t size, gfp_t gfp_mask)
{
@ -92,7 +126,7 @@ void *io_pgtable_alloc_pages_exact(struct io_pgtable_cfg *cfg, void *cookie,
ret = alloc_pages_exact(size, gfp_mask);
if (likely(ret))
atomic_add(1 << get_order(size), &pages_allocated);
mod_pages_allocated(1 << get_order(size));
return ret;
}
@ -107,29 +141,5 @@ void io_pgtable_free_pages_exact(struct io_pgtable_cfg *cfg, void *cookie,
else
free_pages_exact(virt, size);
atomic_sub(1 << get_order(size), &pages_allocated);
mod_pages_allocated(-(1 << get_order(size)));
}
static int io_pgtable_init(void)
{
io_pgtable_top = debugfs_create_dir("io-pgtable", iommu_debugfs_top);
if (!io_pgtable_top)
return -ENODEV;
if (!debugfs_create_atomic_t("pages", 0600,
io_pgtable_top, &pages_allocated)) {
debugfs_remove_recursive(io_pgtable_top);
return -ENODEV;
}
return 0;
}
static void io_pgtable_exit(void)
{
debugfs_remove_recursive(io_pgtable_top);
}
module_init(io_pgtable_init);
module_exit(io_pgtable_exit);