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[PATCH v8 09/46] hw/cxl/device: Timestamp implementation (8.2.9.3)
From: |
Jonathan Cameron |
Subject: |
[PATCH v8 09/46] hw/cxl/device: Timestamp implementation (8.2.9.3) |
Date: |
Fri, 18 Mar 2022 15:05:58 +0000 |
From: Ben Widawsky <ben.widawsky@intel.com>
Errata F4 to CXL 2.0 clarified the meaning of the timer as the
sum of the value set with the timestamp set command and the number
of nano seconds since it was last set.
Signed-off-by: Ben Widawsky <ben.widawsky@intel.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
---
hw/cxl/cxl-mailbox-utils.c | 42 +++++++++++++++++++++++++++++++++++++
include/hw/cxl/cxl_device.h | 6 ++++++
2 files changed, 48 insertions(+)
diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c
index 51af9282e2..05e6bbdd6f 100644
--- a/hw/cxl/cxl-mailbox-utils.c
+++ b/hw/cxl/cxl-mailbox-utils.c
@@ -44,6 +44,9 @@ enum {
#define CLEAR_RECORDS 0x1
#define GET_INTERRUPT_POLICY 0x2
#define SET_INTERRUPT_POLICY 0x3
+ TIMESTAMP = 0x03,
+ #define GET 0x0
+ #define SET 0x1
};
/* 8.2.8.4.5.1 Command Return Codes */
@@ -106,9 +109,46 @@ DEFINE_MAILBOX_HANDLER_NOP(events_clear_records);
DEFINE_MAILBOX_HANDLER_ZEROED(events_get_interrupt_policy, 4);
DEFINE_MAILBOX_HANDLER_NOP(events_set_interrupt_policy);
+/* 8.2.9.3.1 */
+static ret_code cmd_timestamp_get(struct cxl_cmd *cmd,
+ CXLDeviceState *cxl_dstate,
+ uint16_t *len)
+{
+ uint64_t time, delta;
+ uint64_t final_time = 0;
+
+ if (cxl_dstate->timestamp.set) {
+ /* First find the delta from the last time the host set the time. */
+ time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+ delta = time - cxl_dstate->timestamp.last_set;
+ final_time = cxl_dstate->timestamp.host_set + delta;
+ }
+
+ /* Then adjust the actual time */
+ stq_le_p(cmd->payload, final_time);
+ *len = 8;
+
+ return CXL_MBOX_SUCCESS;
+}
+
+/* 8.2.9.3.2 */
+static ret_code cmd_timestamp_set(struct cxl_cmd *cmd,
+ CXLDeviceState *cxl_dstate,
+ uint16_t *len)
+{
+ cxl_dstate->timestamp.set = true;
+ cxl_dstate->timestamp.last_set = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+
+ cxl_dstate->timestamp.host_set = le64_to_cpu(*(uint64_t *)cmd->payload);
+
+ *len = 0;
+ return CXL_MBOX_SUCCESS;
+}
+
static QemuUUID cel_uuid;
#define IMMEDIATE_CONFIG_CHANGE (1 << 1)
+#define IMMEDIATE_POLICY_CHANGE (1 << 3)
#define IMMEDIATE_LOG_CHANGE (1 << 4)
static struct cxl_cmd cxl_cmd_set[256][256] = {
@@ -120,6 +160,8 @@ static struct cxl_cmd cxl_cmd_set[256][256] = {
cmd_events_get_interrupt_policy, 0, 0 },
[EVENTS][SET_INTERRUPT_POLICY] = { "EVENTS_SET_INTERRUPT_POLICY",
cmd_events_set_interrupt_policy, 4, IMMEDIATE_CONFIG_CHANGE },
+ [TIMESTAMP][GET] = { "TIMESTAMP_GET", cmd_timestamp_get, 0, 0 },
+ [TIMESTAMP][SET] = { "TIMESTAMP_SET", cmd_timestamp_set, 8,
IMMEDIATE_POLICY_CHANGE },
};
void cxl_process_mailbox(CXLDeviceState *cxl_dstate)
diff --git a/include/hw/cxl/cxl_device.h b/include/hw/cxl/cxl_device.h
index 7fd8d0f616..8102d2a813 100644
--- a/include/hw/cxl/cxl_device.h
+++ b/include/hw/cxl/cxl_device.h
@@ -117,6 +117,12 @@ typedef struct cxl_device_state {
size_t cel_size;
};
+ struct {
+ bool set;
+ uint64_t last_set;
+ uint64_t host_set;
+ } timestamp;
+
/* memory region for persistent memory, HDM */
uint64_t pmem_size;
} CXLDeviceState;
--
2.32.0
- [PATCH v8 00/46] CXl 2.0 emulation Support, Jonathan Cameron, 2022/03/18
- [PATCH v8 01/46] hw/pci/cxl: Add a CXL component type (interface), Jonathan Cameron, 2022/03/18
- [PATCH v8 02/46] hw/cxl/component: Introduce CXL components (8.1.x, 8.2.5), Jonathan Cameron, 2022/03/18
- [PATCH v8 03/46] MAINTAINERS: Add entry for Compute Express Link Emulation, Jonathan Cameron, 2022/03/18
- [PATCH v8 04/46] hw/cxl/device: Introduce a CXL device (8.2.8), Jonathan Cameron, 2022/03/18
- [PATCH v8 05/46] hw/cxl/device: Implement the CAP array (8.2.8.1-2), Jonathan Cameron, 2022/03/18
- [PATCH v8 06/46] hw/cxl/device: Implement basic mailbox (8.2.8.4), Jonathan Cameron, 2022/03/18
- [PATCH v8 07/46] hw/cxl/device: Add memory device utilities, Jonathan Cameron, 2022/03/18
- [PATCH v8 08/46] hw/cxl/device: Add cheap EVENTS implementation (8.2.9.1), Jonathan Cameron, 2022/03/18
- [PATCH v8 09/46] hw/cxl/device: Timestamp implementation (8.2.9.3),
Jonathan Cameron <=
- [PATCH v8 10/46] hw/cxl/device: Add log commands (8.2.9.4) + CEL, Jonathan Cameron, 2022/03/18
- [PATCH v8 11/46] hw/pxb: Use a type for realizing expanders, Jonathan Cameron, 2022/03/18
- [PATCH v8 12/46] hw/pci/cxl: Create a CXL bus type, Jonathan Cameron, 2022/03/18
- [PATCH v8 13/46] cxl: Machine level control on whether CXL support is enabled, Jonathan Cameron, 2022/03/18
- [PATCH v8 14/46] hw/pxb: Allow creation of a CXL PXB (host bridge), Jonathan Cameron, 2022/03/18
- [PATCH v8 15/46] qtest/cxl: Introduce initial test for pxb-cxl only., Jonathan Cameron, 2022/03/18
- [PATCH v8 16/46] hw/cxl/rp: Add a root port, Jonathan Cameron, 2022/03/18
- [PATCH v8 17/46] hw/cxl/device: Add a memory device (8.2.8.5), Jonathan Cameron, 2022/03/18