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RE: [PATCH v2 2/3] hw/cxl/cxl-mailbox-utils: Add device patrol scrub con
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From: |
Shiju Jose |
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Subject: |
RE: [PATCH v2 2/3] hw/cxl/cxl-mailbox-utils: Add device patrol scrub control feature |
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Date: |
Fri, 16 Feb 2024 12:11:42 +0000 |
Hi Davidlohr,
Thanks for the feedback.
Please find reply inline.
>-----Original Message-----
>From: Davidlohr Bueso <dave@stgolabs.net>
>Sent: 15 February 2024 20:56
>To: Shiju Jose <shiju.jose@huawei.com>
>Cc: qemu-devel@nongnu.org; linux-cxl@vger.kernel.org; Jonathan Cameron
><jonathan.cameron@huawei.com>; tanxiaofei <tanxiaofei@huawei.com>;
>Zengtao (B) <prime.zeng@hisilicon.com>; Linuxarm <linuxarm@huawei.com>;
>fan.ni@samsung.com
>Subject: Re: [PATCH v2 2/3] hw/cxl/cxl-mailbox-utils: Add device patrol scrub
>control feature
>
>On Fri, 24 Nov 2023, shiju.jose@huawei.com wrote:
>
>>From: Shiju Jose <shiju.jose@huawei.com>
>>
>>CXL spec 3.1 section 8.2.9.9.11.1 describes the device patrol scrub
>>control feature. The device patrol scrub proactively locates and makes
>>corrections to errors in regular cycle. The patrol scrub control allows
>>the request to configure patrol scrub input configurations.
>>
>>The patrol scrub control allows the requester to specify the number of
>>hours for which the patrol scrub cycles must be completed, provided
>>that the requested number is not less than the minimum number of hours
>>for the patrol scrub cycle that the device is capable of. In addition,
>>the patrol scrub controls allow the host to disable and enable the
>>feature in case disabling of the feature is needed for other purposes
>>such as performance-aware operations which require the background
>>operations to be turned off.
>>
>>Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
>>Signed-off-by: Shiju Jose <shiju.jose@huawei.com>
>>---
>> hw/cxl/cxl-mailbox-utils.c | 97 +++++++++++++++++++++++++++++++++++++-
>> 1 file changed, 96 insertions(+), 1 deletion(-)
>>
>>diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c
>>index 1bbc9a48a6..5a6f4e4029 100644
>>--- a/hw/cxl/cxl-mailbox-utils.c
>>+++ b/hw/cxl/cxl-mailbox-utils.c
>>@@ -809,6 +809,7 @@ typedef struct CXLSupportedFeatureEntry { }
>>QEMU_PACKED CXLSupportedFeatureEntry;
>>
>> enum CXL_SUPPORTED_FEATURES_LIST {
>>+ CXL_FEATURE_PATROL_SCRUB = 0,
>> CXL_FEATURE_MAX
>> };
>>
>>@@ -849,6 +850,37 @@ enum CXL_SET_FEATURE_FLAG_DATA_TRANSFER {
>> CXL_SET_FEATURE_FLAG_DATA_TRANSFER_MAX
>> };
>>
>>+/* CXL r3.1 section 8.2.9.9.11.1: Device Patrol Scrub Control Feature
>>+*/ static const QemuUUID patrol_scrub_uuid = {
>>+ .data = UUID(0x96dad7d6, 0xfde8, 0x482b, 0xa7, 0x33,
>>+ 0x75, 0x77, 0x4e, 0x06, 0xdb, 0x8a) };
>>+
>>+#define CXL_MEMDEV_PS_GET_FEATURE_VERSION 0x01
>>+#define CXL_MEMDEV_PS_SET_FEATURE_VERSION 0x01
>>+#define CXL_MEMDEV_PS_SCRUB_CYCLE_CHANGE_CAP_DEFAULT BIT(0)
>>+#define CXL_MEMDEV_PS_SCRUB_REALTIME_REPORT_CAP_DEFAULT
>BIT(1)
>>+#define CXL_MEMDEV_PS_CUR_SCRUB_CYCLE_DEFAULT 12
>>+#define CXL_MEMDEV_PS_MIN_SCRUB_CYCLE_DEFAULT 1
>>+#define CXL_MEMDEV_PS_ENABLE_DEFAULT 0
>>+
>>+/* CXL memdev patrol scrub control attributes */ struct
>>+CXLMemPatrolScrubReadAttrbs {
>>+ uint8_t scrub_cycle_cap;
>>+ uint16_t scrub_cycle;
>>+ uint8_t scrub_flags;
>>+} QEMU_PACKED cxl_memdev_ps_feat_read_attrbs;
>>+
>>+typedef struct CXLMemPatrolScrubWriteAttrbs {
>>+ uint8_t scrub_cycle_hr;
>>+ uint8_t scrub_flags;
>>+} QEMU_PACKED CXLMemPatrolScrubWriteAttrbs;
>
>fyi there is an ask, which I certainly agree with, to make these static here
>instead of at runtime.
I will make cxl_memdev_ps_feat_read_attrbs static, however can't make const
because
cxl_memdev_ps_feat_read_attrbs use to store the attributes in the set_feature.
May be rename cxl_memdev_ps_feat_read_attrbs to cxl_memdev_ps_feat_ attrbs to
avoid confusion?
>
>https://lore.kernel.org/linux-cxl/20240119175006.00007f74@Huawei.com/
>
>Also, this series probably needs rebasing per Jonathan's latest branch with
>lots of
>updates.
The v3 posted recently was rebased to
Jonathan's recent branch
https://gitlab.com/jic23/qemu/-/tree/cxl-2024-02-05-draft
Looks like latest branch is cxl-2024-02-14. I will rebase.
20240215110146.1444-1-shiju.jose@huawei.com/T/#t">https://lore.kernel.org/qemu-devel/20240215110146.1444-1-shiju.jose@huawei.com/T/#t
>
>>+
>>+typedef struct CXLMemPatrolScrubSetFeature {
>>+ CXLSetFeatureInHeader hdr;
>>+ CXLMemPatrolScrubWriteAttrbs feat_data; } QEMU_PACKED
>>+QEMU_ALIGNED(16) CXLMemPatrolScrubSetFeature;
>>+
>> /* CXL r3.0 section 8.2.9.6.1: Get Supported Features (Opcode 0500h)
>>*/ static CXLRetCode cmd_features_get_supported(const struct cxl_cmd *cmd,
>> uint8_t *payload_in, @@
>>-872,7 +904,7 @@ static CXLRetCode cmd_features_get_supported(const
>struct cxl_cmd *cmd,
>> uint16_t feat_entries = 0;
>>
>> if (get_feats_in->count < sizeof(CXLSupportedFeatureHeader) ||
>>- get_feats_in->start_index > CXL_FEATURE_MAX) {
>>+ get_feats_in->start_index >= CXL_FEATURE_MAX) {
>> return CXL_MBOX_INVALID_INPUT;
>> }
>> req_entries = (get_feats_in->count - @@ -884,6 +916,31 @@ static
>>CXLRetCode cmd_features_get_supported(const struct cxl_cmd *cmd,
>> entry = 0;
>> while (entry < req_entries) {
>> switch (index) {
>>+ case CXL_FEATURE_PATROL_SCRUB:
>>+ /* Fill supported feature entry for device patrol scrub control
>>*/
>>+ get_feats_out->feat_entries[entry] =
>>+ (struct CXLSupportedFeatureEntry) {
>>+ .uuid = patrol_scrub_uuid,
>>+ .feat_index = index,
>>+ .get_feat_size = sizeof(cxl_memdev_ps_feat_read_attrbs),
>>+ .set_feat_size = sizeof(CXLMemPatrolScrubWriteAttrbs),
>>+ /* Bit[0] : 1, feature attributes changeable */
>>+ .attrb_flags = 0x1,
>>+ .get_feat_version = CXL_MEMDEV_PS_GET_FEATURE_VERSION,
>>+ .set_feat_version = CXL_MEMDEV_PS_SET_FEATURE_VERSION,
>>+ .set_feat_effects = 0,
>>+ };
>>+ feat_entries++;
>>+ /* Set default value for device patrol scrub read attributes */
>>+ cxl_memdev_ps_feat_read_attrbs.scrub_cycle_cap =
>>+
>CXL_MEMDEV_PS_SCRUB_CYCLE_CHANGE_CAP_DEFAULT |
>>+
>CXL_MEMDEV_PS_SCRUB_REALTIME_REPORT_CAP_DEFAULT;
>>+ cxl_memdev_ps_feat_read_attrbs.scrub_cycle =
>>+ CXL_MEMDEV_PS_CUR_SCRUB_CYCLE_DEFAULT |
>>+ (CXL_MEMDEV_PS_MIN_SCRUB_CYCLE_DEFAULT << 8);
>>+ cxl_memdev_ps_feat_read_attrbs.scrub_flags =
>>+ CXL_MEMDEV_PS_ENABLE_DEFAULT;
>>+ break;
>> default:
>> break;
>> }
>>@@ -924,6 +981,21 @@ static CXLRetCode cmd_features_get_feature(const
>struct cxl_cmd *cmd,
>> return CXL_MBOX_INVALID_INPUT;
>> }
>>
>>+ if (qemu_uuid_is_equal(&get_feature->uuid, &patrol_scrub_uuid)) {
>>+ if (get_feature->offset >= sizeof(cxl_memdev_ps_feat_read_attrbs)) {
>>+ return CXL_MBOX_INVALID_INPUT;
>>+ }
>>+ bytes_to_copy = sizeof(cxl_memdev_ps_feat_read_attrbs) -
>>+ get_feature->offset;
>>+ bytes_to_copy = (bytes_to_copy > get_feature->count) ?
>>+ get_feature->count : bytes_to_copy;
>
>min()?
>
>>+ memcpy(payload_out,
>>+ &cxl_memdev_ps_feat_read_attrbs + get_feature->offset,
>>+ bytes_to_copy);
>>+ } else {
>>+ return CXL_MBOX_UNSUPPORTED;
>>+ }
>>+
>> *len_out = bytes_to_copy;
>>
>> return CXL_MBOX_SUCCESS;
>>@@ -937,6 +1009,29 @@ static CXLRetCode cmd_features_set_feature(const
>struct cxl_cmd *cmd,
>> size_t *len_out,
>> CXLCCI *cci) {
>>+ CXLMemPatrolScrubWriteAttrbs *ps_write_attrbs;
>>+ CXLMemPatrolScrubSetFeature *ps_set_feature;
>>+ CXLSetFeatureInHeader *hdr = (void *)payload_in;
>>+
>>+ if (qemu_uuid_is_equal(&hdr->uuid, &patrol_scrub_uuid)) {
>>+ if (hdr->version != CXL_MEMDEV_PS_SET_FEATURE_VERSION ||
>>+ (hdr->flags & CXL_SET_FEATURE_FLAG_DATA_TRANSFER_MASK) !=
>>+ CXL_SET_FEATURE_FLAG_FULL_DATA_TRANSFER) {
>>+ return CXL_MBOX_UNSUPPORTED;
>>+ }
>>+
>>+ ps_set_feature = (void *)payload_in;
>>+ ps_write_attrbs = &ps_set_feature->feat_data;
>>+ cxl_memdev_ps_feat_read_attrbs.scrub_cycle &= ~0xFF;
>>+ cxl_memdev_ps_feat_read_attrbs.scrub_cycle |=
>>+ ps_write_attrbs->scrub_cycle_hr & 0xFF;
>>+ cxl_memdev_ps_feat_read_attrbs.scrub_flags &= ~0x1;
>>+ cxl_memdev_ps_feat_read_attrbs.scrub_flags |=
>>+ ps_write_attrbs->scrub_flags & 0x1;
>>+ } else {
>>+ return CXL_MBOX_UNSUPPORTED;
>>+ }
>>+
>> return CXL_MBOX_SUCCESS;
>> }
>>
>>--
>>2.34.1
>>
Thanks,
Shiju