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Message-ID: <20240827153204.00002bff@Huawei.com>
Date: Tue, 27 Aug 2024 15:32:04 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Ira Weiny <ira.weiny@...el.com>
CC: Dave Jiang <dave.jiang@...el.com>, Fan Ni <fan.ni@...sung.com>, "Navneet
Singh" <navneet.singh@...el.com>, Chris Mason <clm@...com>, Josef Bacik
<josef@...icpanda.com>, David Sterba <dsterba@...e.com>, Petr Mladek
<pmladek@...e.com>, Steven Rostedt <rostedt@...dmis.org>, Andy Shevchenko
<andriy.shevchenko@...ux.intel.com>, Rasmus Villemoes
<linux@...musvillemoes.dk>, Sergey Senozhatsky <senozhatsky@...omium.org>,
Jonathan Corbet <corbet@....net>, Andrew Morton <akpm@...ux-foundation.org>,
Dan Williams <dan.j.williams@...el.com>, Davidlohr Bueso <dave@...olabs.net>,
Alison Schofield <alison.schofield@...el.com>, Vishal Verma
<vishal.l.verma@...el.com>, <linux-btrfs@...r.kernel.org>,
<linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-doc@...r.kernel.org>, <nvdimm@...ts.linux.dev>
Subject: Re: [PATCH v3 24/25] tools/testing/cxl: Make event logs dynamic
On Fri, 16 Aug 2024 09:44:32 -0500
Ira Weiny <ira.weiny@...el.com> wrote:
> The test event logs were created as static arrays as an easy way to mock
> events. Dynamic Capacity Device (DCD) test support requires events be
> generated dynamically when extents are created or destroyed.
>
> Modify the event log storage to be dynamically allocated. Reuse the
> static event data to create the dynamic events in the new logs without
> inventing complex event injection for the previous tests. Simplify the
> processing of the logs by using the event log array index as the handle.
> Add a lock to manage concurrency required when user space is allowed to
> control DCD extents
>
> Signed-off-by: Ira Weiny <ira.weiny@...el.com>
Probably make sense to spinkle some guard() magic in here
to avoid all the places where you goto end of function to release the lock
>
> ---
> Changes:
> [iweiny: rebase]
> ---
> tools/testing/cxl/test/mem.c | 278 ++++++++++++++++++++++++++-----------------
> 1 file changed, 171 insertions(+), 107 deletions(-)
>
> diff --git a/tools/testing/cxl/test/mem.c b/tools/testing/cxl/test/mem.c
> index 129f179b0ac5..674fc7f086cd 100644
> --- a/tools/testing/cxl/test/mem.c
> +++ b/tools/testing/cxl/test/mem.c
> @@ -125,18 +125,27 @@ static struct {
>
> #define PASS_TRY_LIMIT 3
>
> -#define CXL_TEST_EVENT_CNT_MAX 15
> +#define CXL_TEST_EVENT_CNT_MAX 17
Seems you added a couple more. Don't do that in a patch
just changing allocation approach.
I could find 1 but not sure where other one came from!
> -static void mes_add_event(struct mock_event_store *mes,
> +/* Add the event or free it on 'overflow' */
> +static void mes_add_event(struct cxl_mockmem_data *mdata,
> enum cxl_event_log_type log_type,
> struct cxl_event_record_raw *event)
> {
> + struct device *dev = mdata->mds->cxlds.dev;
> struct mock_event_log *log;
> + u16 handle;
>
> if (WARN_ON(log_type >= CXL_EVENT_TYPE_MAX))
> return;
>
> - log = &mes->mock_logs[log_type];
> + log = &mdata->mes.mock_logs[log_type];
>
> - if ((log->nr_events + 1) > CXL_TEST_EVENT_CNT_MAX) {
> + write_lock(&log->lock);
> +
> + handle = log->next_handle;
> + if ((handle + 1) == log->cur_handle) {
> log->nr_overflow++;
> - log->overflow_reset = log->nr_overflow;
> - return;
> + dev_dbg(dev, "Overflowing %d\n", log_type);
> + devm_kfree(dev, event);
> + goto unlock;
> }
>
> - log->events[log->nr_events] = event;
> + dev_dbg(dev, "Log %d; handle %u\n", log_type, handle);
> + event->event.generic.hdr.handle = cpu_to_le16(handle);
> + log->events[handle] = event;
> + event_inc_handle(&log->next_handle);
> log->nr_events++;
> +
> +unlock:
> + write_unlock(&log->lock);
> +}
> +
>
> /*
> @@ -233,8 +254,8 @@ static int mock_get_event(struct device *dev, struct cxl_mbox_cmd *cmd)
> {
> struct cxl_get_event_payload *pl;
> struct mock_event_log *log;
> - u16 nr_overflow;
> u8 log_type;
> + u16 handle;
> int i;
>
> if (cmd->size_in != sizeof(log_type))
> @@ -254,29 +275,39 @@ static int mock_get_event(struct device *dev, struct cxl_mbox_cmd *cmd)
> memset(cmd->payload_out, 0, struct_size(pl, records, 0));
>
> log = event_find_log(dev, log_type);
> - if (!log || event_log_empty(log))
> + if (!log)
> return 0;
>
> pl = cmd->payload_out;
>
> - for (i = 0; i < ret_limit && !event_log_empty(log); i++) {
> - memcpy(&pl->records[i], event_get_current(log),
> - sizeof(pl->records[i]));
> - pl->records[i].event.generic.hdr.handle =
> - event_get_cur_event_handle(log);
> - log->cur_idx++;
> + read_lock(&log->lock);
> +
> + handle = log->cur_handle;
> + dev_dbg(dev, "Get log %d handle %u next %u\n",
> + log_type, handle, log->next_handle);
> + for (i = 0;
> + i < ret_limit && handle != log->next_handle;
As below, maybe combine 2 lines above into 1.
> + i++, event_inc_handle(&handle)) {
> + struct cxl_event_record_raw *cur;
> +
> + cur = log->events[handle];
> + dev_dbg(dev, "Sending event log %d handle %d idx %u\n",
> + log_type, le16_to_cpu(cur->event.generic.hdr.handle),
> + handle);
> + memcpy(&pl->records[i], cur, sizeof(pl->records[i]));
> + pl->records[i].event.generic.hdr.handle = cpu_to_le16(handle);
> }
>
> cmd->size_out = struct_size(pl, records, i);
> pl->record_count = cpu_to_le16(i);
> - if (!event_log_empty(log))
> + if (log->nr_events > i)
> pl->flags |= CXL_GET_EVENT_FLAG_MORE_RECORDS;
>
> if (log->nr_overflow) {
> u64 ns;
>
> pl->flags |= CXL_GET_EVENT_FLAG_OVERFLOW;
> - pl->overflow_err_count = cpu_to_le16(nr_overflow);
> + pl->overflow_err_count = cpu_to_le16(log->nr_overflow);
> ns = ktime_get_real_ns();
> ns -= 5000000000; /* 5s ago */
> pl->first_overflow_timestamp = cpu_to_le64(ns);
> @@ -285,16 +316,17 @@ static int mock_get_event(struct device *dev, struct cxl_mbox_cmd *cmd)
> pl->last_overflow_timestamp = cpu_to_le64(ns);
> }
>
> + read_unlock(&log->lock);
Another one maybe for guard()
> return 0;
> }
>
> static int mock_clear_event(struct device *dev, struct cxl_mbox_cmd *cmd)
> {
> struct cxl_mbox_clear_event_payload *pl = cmd->payload_in;
> - struct mock_event_log *log;
> u8 log_type = pl->event_log;
> + struct mock_event_log *log;
> + int nr, rc = 0;
> u16 handle;
> - int nr;
>
> if (log_type >= CXL_EVENT_TYPE_MAX)
> return -EINVAL;
> @@ -303,24 +335,23 @@ static int mock_clear_event(struct device *dev, struct cxl_mbox_cmd *cmd)
> if (!log)
> return 0; /* No mock data in this log */
>
> - /*
> - * This check is technically not invalid per the specification AFAICS.
> - * (The host could 'guess' handles and clear them in order).
> - * However, this is not good behavior for the host so test it.
> - */
> - if (log->clear_idx + pl->nr_recs > log->cur_idx) {
> - dev_err(dev,
> - "Attempting to clear more events than returned!\n");
> - return -EINVAL;
> - }
> + write_lock(&log->lock);
Use a guard()?
>
> /* Check handle order prior to clearing events */
> - for (nr = 0, handle = event_get_clear_handle(log);
> - nr < pl->nr_recs;
> - nr++, handle++) {
> + handle = log->cur_handle;
> + for (nr = 0;
> + nr < pl->nr_recs && handle != log->next_handle;
I'd combine the two lines above.
> + nr++, event_inc_handle(&handle)) {
> +
> + dev_dbg(dev, "Checking clear of %d handle %u plhandle %u\n",
> + log_type, handle,
> + le16_to_cpu(pl->handles[nr]));
> +
> if (handle != le16_to_cpu(pl->handles[nr])) {
> - dev_err(dev, "Clearing events out of order\n");
> - return -EINVAL;
> + dev_err(dev, "Clearing events out of order %u %u\n",
> + handle, le16_to_cpu(pl->handles[nr]));
> + rc = -EINVAL;
> + goto unlock;
> }
> }
>
> @@ -328,25 +359,12 @@ static int mock_clear_event(struct device *dev, struct cxl_mbox_cmd *cmd)
> log->nr_overflow = 0;
>
> /* Clear events */
> - log->clear_idx += pl->nr_recs;
> - return 0;
> -}
>
> struct cxl_event_record_raw maint_needed = {
> @@ -475,8 +493,27 @@ static int mock_set_timestamp(struct cxl_dev_state *cxlds,
> return 0;
> }
>
> +static void cxl_mock_add_event_logs(struct cxl_mockmem_data *mdata)
> {
> + struct mock_event_store *mes = &mdata->mes;
> + struct device *dev = mdata->mds->cxlds.dev;
> +
> put_unaligned_le16(CXL_GMER_VALID_CHANNEL | CXL_GMER_VALID_RANK,
> &gen_media.rec.media_hdr.validity_flags);
>
> @@ -484,43 +521,60 @@ static void cxl_mock_add_event_logs(struct mock_event_store *mes)
> CXL_DER_VALID_BANK | CXL_DER_VALID_COLUMN,
> &dram.rec.media_hdr.validity_flags);
>
> - mes_add_event(mes, CXL_EVENT_TYPE_INFO, &maint_needed);
> - mes_add_event(mes, CXL_EVENT_TYPE_INFO,
> + dev_dbg(dev, "Generating fake event logs %d\n",
> + CXL_EVENT_TYPE_INFO);
> + add_event_from_static(mdata, CXL_EVENT_TYPE_INFO, &maint_needed);
> + add_event_from_static(mdata, CXL_EVENT_TYPE_INFO,
> (struct cxl_event_record_raw *)&gen_media);
> - mes_add_event(mes, CXL_EVENT_TYPE_INFO,
> + add_event_from_static(mdata, CXL_EVENT_TYPE_INFO,
> (struct cxl_event_record_raw *)&mem_module);
> mes->ev_status |= CXLDEV_EVENT_STATUS_INFO;
>
> - mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &maint_needed);
> - mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> - mes_add_event(mes, CXL_EVENT_TYPE_FAIL,
> + dev_dbg(dev, "Generating fake event logs %d\n",
> + CXL_EVENT_TYPE_FAIL);
> + add_event_from_static(mdata, CXL_EVENT_TYPE_FAIL, &maint_needed);
> + add_event_from_static(mdata, CXL_EVENT_TYPE_FAIL,
> + (struct cxl_event_record_raw *)&mem_module);
So this one is new? I can't spot the other one...
> + add_event_from_static(mdata, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> + add_event_from_static(mdata, CXL_EVENT_TYPE_FAIL,
> (struct cxl_event_record_raw *)&dram);
> - mes_add_event(mes, CXL_EVENT_TYPE_FAIL,
> + add_event_from_static(mdata, CXL_EVENT_TYPE_FAIL,
> (struct cxl_event_record_raw *)&gen_media);
> - mes_add_event(mes, CXL_EVENT_TYPE_FAIL,
> + add_event_from_static(mdata, CXL_EVENT_TYPE_FAIL,
> (struct cxl_event_record_raw *)&mem_module);
> - mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> - mes_add_event(mes, CXL_EVENT_TYPE_FAIL,
> + add_event_from_static(mdata, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> + add_event_from_static(mdata, CXL_EVENT_TYPE_FAIL,
> (struct cxl_event_record_raw *)&dram);
> /* Overflow this log */
> - mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> - mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> - mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> - mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> - mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> - mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> - mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> - mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> - mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> - mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> + add_event_from_static(mdata, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> + add_event_from_static(mdata, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> + add_event_from_static(mdata, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> + add_event_from_static(mdata, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> + add_event_from_static(mdata, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> + add_event_from_static(mdata, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> + add_event_from_static(mdata, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> + add_event_from_static(mdata, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> + add_event_from_static(mdata, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> + add_event_from_static(mdata, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> mes->ev_status |= CXLDEV_EVENT_STATUS_FAIL;
>
> - mes_add_event(mes, CXL_EVENT_TYPE_FATAL, &hardware_replace);
> - mes_add_event(mes, CXL_EVENT_TYPE_FATAL,
> + dev_dbg(dev, "Generating fake event logs %d\n",
> + CXL_EVENT_TYPE_FATAL);
The dev_dbg() fine but not really part of making it dynamic, so adds
a bit of noise. Maybe not worth splitting out though.
> + add_event_from_static(mdata, CXL_EVENT_TYPE_FATAL, &hardware_replace);
> + add_event_from_static(mdata, CXL_EVENT_TYPE_FATAL,
> (struct cxl_event_record_raw *)&dram);
> mes->ev_status |= CXLDEV_EVENT_STATUS_FATAL;
> }
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