Add a sequence to test if ASI exit or not when accessing a mapped
or unmapped memory buffer.
Signed-off-by: Alexandre Chartre <alexandre.char...@oracle.com>
---
drivers/staging/asi/asidrv.c | 70 ++++++++++++++++++++++++++++++++++++
drivers/staging/asi/asidrv.h | 3 ++
2 files changed, 73 insertions(+)
diff --git a/drivers/staging/asi/asidrv.c b/drivers/staging/asi/asidrv.c
index 4f0548edb2f9..4231b56db167 100644
--- a/drivers/staging/asi/asidrv.c
+++ b/drivers/staging/asi/asidrv.c
@@ -14,9 +14,21 @@
#include "asidrv.h"
+#define ASIDRV_TEST_BUFFER_SIZE PAGE_SIZE
+
+/* Number of read for mem/memmap test sequence */
+#define ASIDRV_MEM_READ_COUNT 1000
+
+enum asidrv_state {
+ ASIDRV_STATE_NONE,
+ ASIDRV_STATE_INTR_WAITING,
+ ASIDRV_STATE_INTR_RECEIVED,
+};
+
struct asidrv_test {
struct asi *asi; /* ASI for testing */
struct dpt *dpt; /* ASI decorated page-table */
+ char *buffer; /* buffer for testing */
};
struct asidrv_sequence {
@@ -42,6 +54,10 @@ static struct asidrv_test *asidrv_test_create(void)
if (!test)
return NULL;
+ test->buffer = kzalloc(ASIDRV_TEST_BUFFER_SIZE, GFP_KERNEL);
+ if (!test->buffer)
+ goto error;
+
/*
* Create and fill a decorator page-table to be used with the ASI.
*/
@@ -96,6 +112,7 @@ static void asidrv_test_destroy(struct asidrv_test *test)
if (test->asi)
asi_destroy(test->asi);
+ kfree(test->buffer);
kfree(test);
}
@@ -143,6 +160,51 @@ static int asidrv_asi_is_active(struct asi *asi)
return false;
}
+/*
+ * Memory Buffer Access Test Sequences
+ */
+
+#define OPTNONE __attribute__((optimize(0)))
+
+static enum asidrv_run_error OPTNONE asidrv_mem_run(struct asidrv_test *test)
+{
+ char c;
+ int i, index;
+
+ /*
+ * Do random reads in the test buffer, and return if the ASI
+ * becomes inactive.
+ */
+ for (i = 0; i < ASIDRV_MEM_READ_COUNT; i++) {
+ index = get_cycles() % ASIDRV_TEST_BUFFER_SIZE;
+ c = test->buffer[index];
+ if (!asidrv_asi_is_active(test->asi)) {
+ pr_warn("ASI inactive after reading byte %d at %d\n",
+ i + 1, index);
+ break;
+ }
+ }
+
+ return ASIDRV_RUN_ERR_NONE;
+}
+
+static enum asidrv_run_error asidrv_memmap_setup(struct asidrv_test *test)
+{
+ int err;
+
+ pr_debug("mapping test buffer %px\n", test->buffer);
+ err = dpt_map(test->dpt, test->buffer, ASIDRV_TEST_BUFFER_SIZE);
+ if (err)
+ return ASIDRV_RUN_ERR_MAP_BUFFER;
+
+ return ASIDRV_RUN_ERR_NONE;
+}
+
+static void asidrv_memmap_cleanup(struct asidrv_test *test)
+{
+ dpt_unmap(test->dpt, test->buffer);
+}
+
/*
* Printk Test Sequence
*/
@@ -161,6 +223,14 @@ struct asidrv_sequence asidrv_sequences[] = {
"printk",
NULL, asidrv_printk_run, NULL,
},
+ [ASIDRV_SEQ_MEM] = {
+ "mem",
+ NULL, asidrv_mem_run, NULL,
+ },
+ [ASIDRV_SEQ_MEMMAP] = {
+ "memmap",
+ asidrv_memmap_setup, asidrv_mem_run, asidrv_memmap_cleanup,
+ },
};
static enum asidrv_run_error asidrv_run_init(struct asidrv_test *test)
diff --git a/drivers/staging/asi/asidrv.h b/drivers/staging/asi/asidrv.h
index 33acb058c443..1e820cc64f13 100644
--- a/drivers/staging/asi/asidrv.h
+++ b/drivers/staging/asi/asidrv.h
@@ -8,6 +8,8 @@
enum asidrv_seqnum {
ASIDRV_SEQ_NOP, /* empty sequence */
ASIDRV_SEQ_PRINTK, /* printk sequence */
+ ASIDRV_SEQ_MEM, /* access unmapped memory */
+ ASIDRV_SEQ_MEMMAP, /* access mapped memory */
};
enum asidrv_run_error {
@@ -17,6 +19,7 @@ enum asidrv_run_error {
ASIDRV_RUN_ERR_MAP_TASK, /* failed to map current task */
ASIDRV_RUN_ERR_ENTER, /* failed to enter ASI */
ASIDRV_RUN_ERR_ACTIVE, /* ASI is not active after entering ASI */
+ ASIDRV_RUN_ERR_MAP_BUFFER, /* failed to map buffer */
};
#define ASIDRV_IOCTL_RUN_SEQUENCE _IOWR('a', 1, struct asidrv_run_param)
--
2.18.2
