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Re: [PATCH v4 6/6] hw/cxl: Add clear poison mailbox command support.
From: |
Fan Ni |
Subject: |
Re: [PATCH v4 6/6] hw/cxl: Add clear poison mailbox command support. |
Date: |
Mon, 13 Mar 2023 22:29:18 -0700 |
The 03/03/2023 15:09, Jonathan Cameron wrote:
> Current implementation is very simple so many of the corner
> cases do not exist (e.g. fragmenting larger poison list entries)
>
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> ---
Reviewed-by: Fan Ni <fan.ni@samsung.com>
One minor thing as mentioned below.
> v4:
> - Fix off by one on check of edge of vmr (cut and paste from similar
> but long fixed in the volatile memory series)
> - Drop unnecessary overflow check.
> - Ensure that even in case of overflow we still delete the element
> replaced (in the hole punching case)
> ---
> hw/cxl/cxl-mailbox-utils.c | 77 +++++++++++++++++++++++++++++++++++++
> hw/mem/cxl_type3.c | 36 +++++++++++++++++
> include/hw/cxl/cxl_device.h | 1 +
> 3 files changed, 114 insertions(+)
>
> diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c
> index 64a3f3c1bf..0b30307fa3 100644
> --- a/hw/cxl/cxl-mailbox-utils.c
> +++ b/hw/cxl/cxl-mailbox-utils.c
> @@ -65,6 +65,7 @@ enum {
> MEDIA_AND_POISON = 0x43,
> #define GET_POISON_LIST 0x0
> #define INJECT_POISON 0x1
> + #define CLEAR_POISON 0x2
> };
>
> /* 8.2.8.4.5.1 Command Return Codes */
> @@ -511,6 +512,80 @@ static CXLRetCode cmd_media_inject_poison(struct cxl_cmd
> *cmd,
> return CXL_MBOX_SUCCESS;
> }
>
> +static CXLRetCode cmd_media_clear_poison(struct cxl_cmd *cmd,
> + CXLDeviceState *cxl_dstate,
> + uint16_t *len)
Since 'len' is never used in the function, I am wondering whether it
would be better to rename it to makes that more obvious like "len_unused".
> +{
> + CXLType3Dev *ct3d = container_of(cxl_dstate, CXLType3Dev, cxl_dstate);
> + CXLPoisonList *poison_list = &ct3d->poison_list;
> + CXLType3Class *cvc = CXL_TYPE3_GET_CLASS(ct3d);
> + struct clear_poison_pl {
> + uint64_t dpa;
> + uint8_t data[64];
> + };
> + CXLPoison *ent;
> + uint64_t dpa;
> +
> + struct clear_poison_pl *in = (void *)cmd->payload;
> +
> + dpa = ldq_le_p(&in->dpa);
> + if (dpa + 64 > cxl_dstate->mem_size) {
> + return CXL_MBOX_INVALID_PA;
> + }
> +
> + /* Always exit loop on entry removal so no need for safe variant */
> + QLIST_FOREACH(ent, poison_list, node) {
> + /*
> + * Test for contained in entry. Simpler than general case
> + * as clearing 64 bytes and entries 64 byte aligned
> + */
> + if ((dpa < ent->start) || (dpa >= ent->start + ent->length)) {
> + continue;
> + }
> + /* Do accounting early as we know one will go away */
> + ct3d->poison_list_cnt--;
> + if (dpa > ent->start) {
> + CXLPoison *frag;
> + /* Cannot overflow as replacing existing entry */
> +
> + frag = g_new0(CXLPoison, 1);
> +
> + frag->start = ent->start;
> + frag->length = dpa - ent->start;
> + frag->type = ent->type;
> +
> + QLIST_INSERT_HEAD(poison_list, frag, node);
> + ct3d->poison_list_cnt++;
> + }
> + if (dpa + 64 < ent->start + ent->length) {
> + CXLPoison *frag;
> +
> + if (ct3d->poison_list_cnt == CXL_POISON_LIST_LIMIT) {
> + cxl_set_poison_list_overflowed(ct3d);
> + } else {
> + frag = g_new0(CXLPoison, 1);
> +
> + frag->start = dpa + 64;
> + frag->length = ent->start + ent->length - frag->start;
> + frag->type = ent->type;
> + QLIST_INSERT_HEAD(poison_list, frag, node);
> + ct3d->poison_list_cnt++;
> + }
> + }
> + /* Any fragments have been added, free original entry */
> + QLIST_REMOVE(ent, node);
> + g_free(ent);
> + break;
> + }
> + /* Clearing a region with no poison is not an error so always do so */
> + if (cvc->set_cacheline)
> + if (!cvc->set_cacheline(ct3d, dpa, in->data)) {
> + return CXL_MBOX_INTERNAL_ERROR;
> + }
> +
> + return CXL_MBOX_SUCCESS;
> +}
> +
> #define IMMEDIATE_CONFIG_CHANGE (1 << 1)
> #define IMMEDIATE_DATA_CHANGE (1 << 2)
> #define IMMEDIATE_POLICY_CHANGE (1 << 3)
> @@ -542,6 +617,8 @@ static struct cxl_cmd cxl_cmd_set[256][256] = {
> cmd_media_get_poison_list, 16, 0 },
> [MEDIA_AND_POISON][INJECT_POISON] = { "MEDIA_AND_POISON_INJECT_POISON",
> cmd_media_inject_poison, 8, 0 },
> + [MEDIA_AND_POISON][CLEAR_POISON] = { "MEDIA_AND_POISON_CLEAR_POISON",
> + cmd_media_clear_poison, 72, 0 },
> };
>
> void cxl_process_mailbox(CXLDeviceState *cxl_dstate)
> diff --git a/hw/mem/cxl_type3.c b/hw/mem/cxl_type3.c
> index 21e3a84785..0d9de0ee03 100644
> --- a/hw/mem/cxl_type3.c
> +++ b/hw/mem/cxl_type3.c
> @@ -919,6 +919,41 @@ static void set_lsa(CXLType3Dev *ct3d, const void *buf,
> uint64_t size,
> */
> }
>
> +static bool set_cacheline(CXLType3Dev *ct3d, uint64_t dpa_offset, uint8_t
> *data)
> +{
> + MemoryRegion *vmr = NULL, *pmr = NULL;
> + AddressSpace *as;
> +
> + if (ct3d->hostvmem) {
> + vmr = host_memory_backend_get_memory(ct3d->hostvmem);
> + }
> + if (ct3d->hostpmem) {
> + pmr = host_memory_backend_get_memory(ct3d->hostpmem);
> + }
> +
> + if (!vmr && !pmr) {
> + return false;
> + }
> +
> + if (dpa_offset + 64 > int128_get64(ct3d->cxl_dstate.mem_size)) {
> + return false;
> + }
> +
> + if (vmr) {
> + if (dpa_offset < int128_get64(vmr->size)) {
> + as = &ct3d->hostvmem_as;
> + } else {
> + as = &ct3d->hostpmem_as;
> + dpa_offset -= vmr->size;
> + }
> + } else {
> + as = &ct3d->hostpmem_as;
> + }
> +
> + address_space_write(as, dpa_offset, MEMTXATTRS_UNSPECIFIED, &data, 64);
> + return true;
> +}
> +
> void cxl_set_poison_list_overflowed(CXLType3Dev *ct3d)
> {
> ct3d->poison_list_overflowed = true;
> @@ -1140,6 +1175,7 @@ static void ct3_class_init(ObjectClass *oc, void *data)
> cvc->get_lsa_size = get_lsa_size;
> cvc->get_lsa = get_lsa;
> cvc->set_lsa = set_lsa;
> + cvc->set_cacheline = set_cacheline;
> }
>
> static const TypeInfo ct3d_info = {
> diff --git a/include/hw/cxl/cxl_device.h b/include/hw/cxl/cxl_device.h
> index 32c234ea91..73328a52cf 100644
> --- a/include/hw/cxl/cxl_device.h
> +++ b/include/hw/cxl/cxl_device.h
> @@ -298,6 +298,7 @@ struct CXLType3Class {
> uint64_t offset);
> void (*set_lsa)(CXLType3Dev *ct3d, const void *buf, uint64_t size,
> uint64_t offset);
> + bool (*set_cacheline)(CXLType3Dev *ct3d, uint64_t dpa_offset, uint8_t
> *data);
> };
>
> MemTxResult cxl_type3_read(PCIDevice *d, hwaddr host_addr, uint64_t *data,
> --
> 2.37.2
>
--
John Smith
My name is not generic at all.
- Re: [PATCH v4 4/6] hw/cxl: QMP based poison injection support, (continued)