[Intel-gfx] [PATCH v2 i-g-t] lib/intel_mmio: Fix mmapped resources not unmapped on fini
Janusz Krzysztofik
janusz.krzysztofik at linux.intel.com
Tue Mar 1 14:07:55 UTC 2022
Commit 5f3cfa485eb4 ("lib: Use safe wrappers around libpciaccess
initialization functions") took care of not leaking memory allocated by
pci_system_init() but didn't take care of users potentially attempting to
reinitialize global data maintained by libpciaccess. For example,
intel_register_access_init() mmaps device's PCI BAR0 resource with
pci_device_map_range() but intel_register_access_fini() doesn't unmap it
and next call to intel_register_access_init() fails on attempt to mmap it
again with pci_device_map_range().
Fix it, and also provide intel_mmio_umap_*() counterparts to public
functions intel_mmio_use_pci_bar() and intel_mmio_use_dump_file().
v2: apply last minute fixes, cached but unfortunately not committed before
sending
Signed-off-by: Janusz Krzysztofik <janusz.krzysztofik at linux.intel.com>
---
lib/intel_io.h | 4 +++
lib/intel_mmio.c | 67 ++++++++++++++++++++++++++++++++++++++++++------
2 files changed, 63 insertions(+), 8 deletions(-)
diff --git a/lib/intel_io.h b/lib/intel_io.h
index 1cfe4fb6b9..ea2649d9bc 100644
--- a/lib/intel_io.h
+++ b/lib/intel_io.h
@@ -49,6 +49,8 @@ struct intel_register_map {
struct intel_mmio_data {
void *igt_mmio;
+ size_t mmio_size;
+ struct pci_device *dev;
struct intel_register_map map;
uint32_t pci_device_id;
int key;
@@ -57,7 +59,9 @@ struct intel_mmio_data {
void intel_mmio_use_pci_bar(struct intel_mmio_data *mmio_data,
struct pci_device *pci_dev);
+void intel_mmio_unmap_pci_bar(struct intel_mmio_data *mmio_data);
void intel_mmio_use_dump_file(struct intel_mmio_data *mmio_data, char *file);
+void intel_mmio_unmap_dump_file(struct intel_mmio_data *mmio_data);
int intel_register_access_init(struct intel_mmio_data *mmio_data,
struct pci_device *pci_dev, int safe, int fd);
diff --git a/lib/intel_mmio.c b/lib/intel_mmio.c
index 667a69f5aa..cb8f9db2e5 100644
--- a/lib/intel_mmio.c
+++ b/lib/intel_mmio.c
@@ -82,6 +82,8 @@ void *igt_global_mmio;
* Sets also up mmio_data->igt_mmio to point at the data contained
* in @file. This allows the same code to get reused for dumping and decoding
* from running hardware as from register dumps.
+ *
+ * Users are expected to call intel_mmio_unmap_dump_file() after use.
*/
void
intel_mmio_use_dump_file(struct intel_mmio_data *mmio_data, char *file)
@@ -99,11 +101,29 @@ intel_mmio_use_dump_file(struct intel_mmio_data *mmio_data, char *file)
igt_fail_on_f(mmio_data->igt_mmio == MAP_FAILED,
"Couldn't mmap %s\n", file);
+ mmio_data->mmio_size = st.st_size;
igt_global_mmio = mmio_data->igt_mmio;
close(fd);
}
+/**
+ * intel_mmio_unmap_dump_file:
+ * @mmio_data: mmio structure for IO operations
+ *
+ * Unmaps a dump file mmapped with intel_mmio_use_dump_file()
+ */
+void intel_mmio_unmap_dump_file(struct intel_mmio_data *mmio_data)
+{
+ if (igt_warn_on_f(!mmio_data->mmio_size || mmio_data->dev,
+ "test bug: argument doesn't point to struct intel_mmio_data initialized with intel_mmio_use_dump_file()\n"))
+ return;
+
+ igt_global_mmio = NULL;
+ igt_debug_on(munmap(mmio_data->igt_mmio, mmio_data->mmio_size) < 0);
+ mmio_data->mmio_size = 0;
+}
+
/**
* intel_mmio_use_pci_bar:
* @mmio_data: mmio structure for IO operations
@@ -112,12 +132,14 @@ intel_mmio_use_dump_file(struct intel_mmio_data *mmio_data, char *file)
* Fill a mmio_data stucture with igt_mmio to point at the mmio bar.
*
* @pci_dev can be obtained from intel_get_pci_device().
+ *
+ * Users are expected to call intel_mmio_unmap_pci_bar() after use.
*/
void
intel_mmio_use_pci_bar(struct intel_mmio_data *mmio_data, struct pci_device *pci_dev)
{
uint32_t devid, gen;
- int mmio_bar, mmio_size;
+ int mmio_bar;
int error;
memset(mmio_data, 0, sizeof(struct intel_mmio_data));
@@ -129,22 +151,42 @@ intel_mmio_use_pci_bar(struct intel_mmio_data *mmio_data, struct pci_device *pci
gen = intel_gen(devid);
if (gen < 3)
- mmio_size = 512*1024;
+ mmio_data->mmio_size = 512*1024;
else if (gen < 5)
- mmio_size = 512*1024;
+ mmio_data->mmio_size = 512*1024;
else
- mmio_size = 2*1024*1024;
+ mmio_data->mmio_size = 2*1024*1024;
error = pci_device_map_range (pci_dev,
pci_dev->regions[mmio_bar].base_addr,
- mmio_size,
+ mmio_data->mmio_size,
PCI_DEV_MAP_FLAG_WRITABLE,
&mmio_data->igt_mmio);
- igt_global_mmio = mmio_data->igt_mmio;
-
igt_fail_on_f(error != 0,
"Couldn't map MMIO region\n");
+
+ mmio_data->dev = pci_dev;
+ igt_global_mmio = mmio_data->igt_mmio;
+}
+
+/**
+ * intel_mmio_unmap_pci_bar:
+ * @mmio_data: mmio structure for IO operations
+ *
+ * Unmaps a PCI BAR region mmapped with intel_mmio_use_pci_bar()
+ */
+void intel_mmio_unmap_pci_bar(struct intel_mmio_data *mmio_data)
+{
+ if (igt_warn_on_f(!mmio_data->dev,
+ "test bug: argument doesn't point to struct intel_mmio_data initialized with intel_mmio_use_pci_bar()\n"))
+ return;
+
+ igt_global_mmio = NULL;
+ igt_debug_on(pci_device_unmap_range(mmio_data->dev,
+ mmio_data->igt_mmio, mmio_data->mmio_size) < 0);
+ mmio_data->dev = NULL;
+ mmio_data->mmio_size = 0;
}
static void
@@ -166,6 +208,8 @@ release_forcewake_lock(int fd)
* It also initializes mmio_data->igt_mmio like intel_mmio_use_pci_bar().
*
* @pci_dev can be obtained from intel_get_pci_device().
+ *
+ * Users are expected to call intel_register_access_fini() after use.
*/
int
intel_register_access_init(struct intel_mmio_data *mmio_data, struct pci_device *pci_dev, int safe, int fd)
@@ -222,8 +266,15 @@ int intel_register_access_needs_fakewake(struct intel_mmio_data *mmio_data)
void
intel_register_access_fini(struct intel_mmio_data *mmio_data)
{
- if (mmio_data->key && intel_register_access_needs_wake(mmio_data))
+ if (igt_warn_on_f(!mmio_data->key,
+ "test bug: argument doesn't point to struct intel_mmio_data initialized with intel_register_access_init()\n"))
+ return;
+
+ if (intel_register_access_needs_wake(mmio_data))
release_forcewake_lock(mmio_data->key);
+ mmio_data->key = 0;
+
+ intel_mmio_unmap_pci_bar(mmio_data);
}
/**
--
2.25.1
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