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resource, kunit: add test case for region_intersects()

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Patch series "resource: Fix region_intersects() vs
add_memory_driver_managed()", v3.

The patchset fixes a bug of region_intersects() for systems with CXL
memory.  The details of the bug can be found in [1/3].  To avoid similar
bugs in the future.  A kunit test case for region_intersects() is added in
[3/3].  [2/3] is a preparation patch for [3/3].


This patch (of 3):

region_intersects() is important because it's used for /dev/mem permission
checking.  To avoid possible bug of region_intersects() in the future, a
kunit test case for region_intersects() is added.

Link: https://lkml.kernel.org/r/20240906030713.204292-1-ying.huang@intel.com
Link: https://lkml.kernel.org/r/20240906030713.204292-4-ying.huang@intel.com
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Jonathan Cameron <jonathan.cameron@huawei.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Alison Schofield <alison.schofield@intel.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Baoquan He <bhe@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Huang Ying 2024-09-06 11:07:13 +08:00 committed by Andrew Morton
parent bacf9c3cbb
commit 99185c10d5
3 changed files with 158 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

20
kernel/resource.c
View file

@ -1817,7 +1817,17 @@ EXPORT_SYMBOL(resource_list_free);
#ifdef CONFIG_GET_FREE_REGION
#define GFR_DESCENDING (1UL << 0)
#define GFR_REQUEST_REGION (1UL << 1)
#define GFR_DEFAULT_ALIGN (1UL << PA_SECTION_SHIFT)
#ifdef PA_SECTION_SHIFT
#define GFR_DEFAULT_ALIGN (1UL << PA_SECTION_SHIFT)
#else
#define GFR_DEFAULT_ALIGN PAGE_SIZE
#endif
#ifdef MAX_PHYSMEM_BITS
#define MAX_PHYS_ADDR ((1ULL << MAX_PHYSMEM_BITS) - 1)
#else
#define MAX_PHYS_ADDR (-1ULL)
#endif
static resource_size_t gfr_start(struct resource *base, resource_size_t size,
resource_size_t align, unsigned long flags)
@ -1825,8 +1835,7 @@ static resource_size_t gfr_start(struct resource *base, resource_size_t size,
if (flags & GFR_DESCENDING) {
resource_size_t end;
end = min_t(resource_size_t, base->end,
(1ULL << MAX_PHYSMEM_BITS) - 1);
end = min_t(resource_size_t, base->end, MAX_PHYS_ADDR);
return end - size + 1;
}
@ -1843,8 +1852,7 @@ static bool gfr_continue(struct resource *base, resource_size_t addr,
* @size did not wrap 0.
*/
return addr > addr - size &&
addr <= min_t(resource_size_t, base->end,
(1ULL << MAX_PHYSMEM_BITS) - 1);
addr <= min_t(resource_size_t, base->end, MAX_PHYS_ADDR);
}
static resource_size_t gfr_next(resource_size_t addr, resource_size_t size,
@ -2005,7 +2013,7 @@ struct resource *alloc_free_mem_region(struct resource *base,
return get_free_mem_region(NULL, base, size, align, name,
IORES_DESC_NONE, flags);
}
EXPORT_SYMBOL_NS_GPL(alloc_free_mem_region, CXL);
EXPORT_SYMBOL_GPL(alloc_free_mem_region);
#endif /* CONFIG_GET_FREE_REGION */
static int __init strict_iomem(char *str)

143
kernel/resource_kunit.c
View file

@ -7,6 +7,8 @@
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/sizes.h>
#include <linux/mm.h>
#define R0_START 0x0000
#define R0_END 0xffff
@ -137,9 +139,150 @@ static void resource_test_intersection(struct kunit *test)
} while (++i < ARRAY_SIZE(results_for_intersection));
}
/*
* The test resource tree for region_intersects() test:
*
* BASE-BASE+1M-1 : Test System RAM 0
* # hole 0 (BASE+1M-BASE+2M)
* BASE+2M-BASE+3M-1 : Test CXL Window 0
* BASE+3M-BASE+4M-1 : Test System RAM 1
* BASE+4M-BASE+7M-1 : Test CXL Window 1
* BASE+4M-BASE+5M-1 : Test System RAM 2
* BASE+4M+128K-BASE+4M+256K-1: Test Code
* BASE+5M-BASE+6M-1 : Test System RAM 3
*/
#define RES_TEST_RAM0_OFFSET 0
#define RES_TEST_RAM0_SIZE SZ_1M
#define RES_TEST_HOLE0_OFFSET (RES_TEST_RAM0_OFFSET + RES_TEST_RAM0_SIZE)
#define RES_TEST_HOLE0_SIZE SZ_1M
#define RES_TEST_WIN0_OFFSET (RES_TEST_HOLE0_OFFSET + RES_TEST_HOLE0_SIZE)
#define RES_TEST_WIN0_SIZE SZ_1M
#define RES_TEST_RAM1_OFFSET (RES_TEST_WIN0_OFFSET + RES_TEST_WIN0_SIZE)
#define RES_TEST_RAM1_SIZE SZ_1M
#define RES_TEST_WIN1_OFFSET (RES_TEST_RAM1_OFFSET + RES_TEST_RAM1_SIZE)
#define RES_TEST_WIN1_SIZE (SZ_1M * 3)
#define RES_TEST_RAM2_OFFSET RES_TEST_WIN1_OFFSET
#define RES_TEST_RAM2_SIZE SZ_1M
#define RES_TEST_CODE_OFFSET (RES_TEST_RAM2_OFFSET + SZ_128K)
#define RES_TEST_CODE_SIZE SZ_128K
#define RES_TEST_RAM3_OFFSET (RES_TEST_RAM2_OFFSET + RES_TEST_RAM2_SIZE)
#define RES_TEST_RAM3_SIZE SZ_1M
#define RES_TEST_TOTAL_SIZE ((RES_TEST_WIN1_OFFSET + RES_TEST_WIN1_SIZE))
static void remove_free_resource(void *ctx)
{
struct resource *res = (struct resource *)ctx;
remove_resource(res);
kfree(res);
}
static void resource_test_request_region(struct kunit *test, struct resource *parent,
resource_size_t start, resource_size_t size,
const char *name, unsigned long flags)
{
struct resource *res;
res = __request_region(parent, start, size, name, flags);
KUNIT_ASSERT_NOT_NULL(test, res);
kunit_add_action_or_reset(test, remove_free_resource, res);
}
static void resource_test_insert_resource(struct kunit *test, struct resource *parent,
resource_size_t start, resource_size_t size,
const char *name, unsigned long flags)
{
struct resource *res;
res = kzalloc(sizeof(*res), GFP_KERNEL);
KUNIT_ASSERT_NOT_NULL(test, res);
res->name = name;
res->start = start;
res->end = start + size - 1;
res->flags = flags;
if (insert_resource(parent, res)) {
kfree(res);
KUNIT_FAIL_AND_ABORT(test, "Fail to insert resource %pR\n", res);
}
kunit_add_action_or_reset(test, remove_free_resource, res);
}
static void resource_test_region_intersects(struct kunit *test)
{
unsigned long flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
struct resource *parent;
resource_size_t start;
/* Find an iomem_resource hole to hold test resources */
parent = alloc_free_mem_region(&iomem_resource, RES_TEST_TOTAL_SIZE, SZ_1M,
"test resources");
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, parent);
start = parent->start;
kunit_add_action_or_reset(test, remove_free_resource, parent);
resource_test_request_region(test, parent, start + RES_TEST_RAM0_OFFSET,
RES_TEST_RAM0_SIZE, "Test System RAM 0", flags);
resource_test_insert_resource(test, parent, start + RES_TEST_WIN0_OFFSET,
RES_TEST_WIN0_SIZE, "Test CXL Window 0",
IORESOURCE_MEM);
resource_test_request_region(test, parent, start + RES_TEST_RAM1_OFFSET,
RES_TEST_RAM1_SIZE, "Test System RAM 1", flags);
resource_test_insert_resource(test, parent, start + RES_TEST_WIN1_OFFSET,
RES_TEST_WIN1_SIZE, "Test CXL Window 1",
IORESOURCE_MEM);
resource_test_request_region(test, parent, start + RES_TEST_RAM2_OFFSET,
RES_TEST_RAM2_SIZE, "Test System RAM 2", flags);
resource_test_insert_resource(test, parent, start + RES_TEST_CODE_OFFSET,
RES_TEST_CODE_SIZE, "Test Code", flags);
resource_test_request_region(test, parent, start + RES_TEST_RAM3_OFFSET,
RES_TEST_RAM3_SIZE, "Test System RAM 3", flags);
kunit_release_action(test, remove_free_resource, parent);
KUNIT_EXPECT_EQ(test, REGION_INTERSECTS,
region_intersects(start + RES_TEST_RAM0_OFFSET, PAGE_SIZE,
IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
KUNIT_EXPECT_EQ(test, REGION_INTERSECTS,
region_intersects(start + RES_TEST_RAM0_OFFSET +
RES_TEST_RAM0_SIZE - PAGE_SIZE, 2 * PAGE_SIZE,
IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
KUNIT_EXPECT_EQ(test, REGION_DISJOINT,
region_intersects(start + RES_TEST_HOLE0_OFFSET, PAGE_SIZE,
IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
KUNIT_EXPECT_EQ(test, REGION_DISJOINT,
region_intersects(start + RES_TEST_HOLE0_OFFSET +
RES_TEST_HOLE0_SIZE - PAGE_SIZE, 2 * PAGE_SIZE,
IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
KUNIT_EXPECT_EQ(test, REGION_MIXED,
region_intersects(start + RES_TEST_WIN0_OFFSET +
RES_TEST_WIN0_SIZE - PAGE_SIZE, 2 * PAGE_SIZE,
IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
KUNIT_EXPECT_EQ(test, REGION_INTERSECTS,
region_intersects(start + RES_TEST_RAM1_OFFSET +
RES_TEST_RAM1_SIZE - PAGE_SIZE, 2 * PAGE_SIZE,
IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
KUNIT_EXPECT_EQ(test, REGION_INTERSECTS,
region_intersects(start + RES_TEST_RAM2_OFFSET +
RES_TEST_RAM2_SIZE - PAGE_SIZE, 2 * PAGE_SIZE,
IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
KUNIT_EXPECT_EQ(test, REGION_INTERSECTS,
region_intersects(start + RES_TEST_CODE_OFFSET, PAGE_SIZE,
IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
KUNIT_EXPECT_EQ(test, REGION_INTERSECTS,
region_intersects(start + RES_TEST_RAM2_OFFSET,
RES_TEST_RAM2_SIZE + PAGE_SIZE,
IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
KUNIT_EXPECT_EQ(test, REGION_MIXED,
region_intersects(start + RES_TEST_RAM3_OFFSET,
RES_TEST_RAM3_SIZE + PAGE_SIZE,
IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
}
static struct kunit_case resource_test_cases[] = {
KUNIT_CASE(resource_test_union),
KUNIT_CASE(resource_test_intersection),
KUNIT_CASE(resource_test_region_intersects),
{}
};

1
lib/Kconfig.debug
View file

@ -2616,6 +2616,7 @@ config RESOURCE_KUNIT_TEST
tristate "KUnit test for resource API" if !KUNIT_ALL_TESTS
depends on KUNIT
default KUNIT_ALL_TESTS
select GET_FREE_REGION
help
This builds the resource API unit test.
Tests the logic of API provided by resource.c and ioport.h.