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Groups > linux.kernel > #1332935
| From | Alexander Shishkin <alexander.shishkin@linux.intel.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [QUEUED v20160212 12/19] stm class: dummy_stm: Create multiple devices |
| Date | 2016-02-12 18:20 +0100 |
| Message-ID | <r1pxU-1vA-15@gated-at.bofh.it> (permalink) |
| References | <r1poe-1rA-7@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
STM framework should be able to handle multiple STM devices at a time,
each one with its own master allocation policy.
This patch changes dummy_stm driver to create multiple STM sinks to
help testing the framework.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
---
drivers/hwtracing/stm/dummy_stm.c | 57 ++++++++++++++++++++++++++++++++-------
1 file changed, 48 insertions(+), 9 deletions(-)
diff --git a/drivers/hwtracing/stm/dummy_stm.c b/drivers/hwtracing/stm/dummy_stm.c
index 3709bef0b2..4ff5961cd3 100644
--- a/drivers/hwtracing/stm/dummy_stm.c
+++ b/drivers/hwtracing/stm/dummy_stm.c
@@ -40,22 +40,61 @@ dummy_stm_packet(struct stm_data *stm_data, unsigned int master,
return size;
}
-static struct stm_data dummy_stm = {
- .name = "dummy_stm",
- .sw_start = 0x0000,
- .sw_end = 0xffff,
- .sw_nchannels = 0xffff,
- .packet = dummy_stm_packet,
-};
+#define DUMMY_STM_MAX 32
+
+static struct stm_data dummy_stm[DUMMY_STM_MAX];
+
+static int nr_dummies = 4;
+
+module_param(nr_dummies, int, 0600);
+
+static unsigned int dummy_stm_nr;
static int dummy_stm_init(void)
{
- return stm_register_device(NULL, &dummy_stm, THIS_MODULE);
+ int i, ret = -ENOMEM, __nr_dummies = ACCESS_ONCE(nr_dummies);
+
+ if (__nr_dummies < 0 || __nr_dummies > DUMMY_STM_MAX)
+ return -EINVAL;
+
+ for (i = 0; i < __nr_dummies; i++) {
+ dummy_stm[i].name = kasprintf(GFP_KERNEL, "dummy_stm.%d", i);
+ if (!dummy_stm[i].name)
+ goto fail_unregister;
+
+ dummy_stm[i].sw_start = 0x0000;
+ dummy_stm[i].sw_end = 0xffff;
+ dummy_stm[i].sw_nchannels = 0xffff;
+ dummy_stm[i].packet = dummy_stm_packet;
+
+ ret = stm_register_device(NULL, &dummy_stm[i], THIS_MODULE);
+ if (ret)
+ goto fail_free;
+ }
+
+ dummy_stm_nr = __nr_dummies;
+
+ return 0;
+
+fail_unregister:
+ for (i--; i >= 0; i--) {
+ stm_unregister_device(&dummy_stm[i]);
+fail_free:
+ kfree(dummy_stm[i].name);
+ }
+
+ return ret;
+
}
static void dummy_stm_exit(void)
{
- stm_unregister_device(&dummy_stm);
+ int i;
+
+ for (i = 0; i < dummy_stm_nr; i++) {
+ stm_unregister_device(&dummy_stm[i]);
+ kfree(dummy_stm[i].name);
+ }
}
module_init(dummy_stm_init);
--
2.7.0
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[QUEUED v20160212 00/19] stm class/intel_th: Patches in my queue Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-02-12 18:10 +0100 [QUEUED v20160212 01/19] stm class: Use a signed return type for stm_find_master_chan Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-02-12 18:10 +0100 [QUEUED v20160212 04/19] intel_th: Update scratchpad bits according to enabled output activity Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-02-12 18:10 +0100 [QUEUED v20160212 02/19] intel_th: Depend on HAS_IOMEM Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-02-12 18:10 +0100 [QUEUED v20160212 07/19] intel_th: sth: Sanitize packet callback's return values Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-02-12 18:10 +0100 [QUEUED v20160212 08/19] intel_th: Set root device's drvdata early Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-02-12 18:10 +0100 [QUEUED v20160212 11/19] stm class: Support devices with multiple instances Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-02-12 18:10 +0100 [QUEUED v20160212 03/19] intel_th: gth: Remove commented-out code Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-02-12 18:10 +0100 [QUEUED v20160212 18/19] stm class: Plug stm device's unlink callback Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-02-12 18:20 +0100 [QUEUED v20160212 16/19] stm class: Fix unbalanced module/device refcounting Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-02-12 18:20 +0100 [QUEUED v20160212 19/19] stm class: dummy_stm: Add link callback for fault injection Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-02-12 18:20 +0100 [QUEUED v20160212 12/19] stm class: dummy_stm: Create multiple devices Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-02-12 18:20 +0100 [QUEUED v20160212 17/19] stm class: Fix a race in unlinking Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-02-12 18:20 +0100 [QUEUED v20160212 15/19] stm class: Guard output assignment against concurrency Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-02-12 18:20 +0100 [QUEUED v20160212 14/19] stm class: Fix unlocking braino in the error path Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-02-12 18:20 +0100 [QUEUED v20160212 13/19] stm class: Add heartbeat stm source device Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2016-02-12 18:20 +0100
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