| Message ID | 162982123813.1124374.3721946437291753388.stgit@dwillia2-desk3.amr.corp.intel.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | cxl_test: Enable CXL Topology and UAPI regression tests | expand |
On Tue, 24 Aug 2021 09:07:18 -0700 Dan Williams <dan.j.williams@intel.com> wrote: > The LIBNVDIMM IOCTL UAPI calls back to the nvdimm-bus-provider to > translate the Linux command payload to the device native command format. > The LIBNVDIMM commands get-config-size, get-config-data, and > set-config-data, map to the CXL memory device commands device-identify, > get-lsa, and set-lsa. Recall that the label-storage-area (LSA) on an > NVDIMM device arranges for the provisioning of namespaces. Additionally > for CXL the LSA is used for provisioning regions as well. > > The data from device-identify is already cached in the 'struct cxl_mem' > instance associated with @cxl_nvd, so that payload return is simply > crafted and no CXL command is issued. The conversion for get-lsa is > straightforward, but the conversion for set-lsa requires an allocation > to append the set-lsa header in front of the payload. > > Acked-by: Ben Widawsky <ben.widawsky@intel.com> > Signed-off-by: Dan Williams <dan.j.williams@intel.com> Minor query inline. > --- > drivers/cxl/pmem.c | 121 ++++++++++++++++++++++++++++++++++++++++++++++++++-- > 1 file changed, 117 insertions(+), 4 deletions(-) > > diff --git a/drivers/cxl/pmem.c b/drivers/cxl/pmem.c > index 469b984176a2..6cc76302c8f8 100644 > --- a/drivers/cxl/pmem.c > +++ b/drivers/cxl/pmem.c > @@ -52,10 +52,10 @@ static int cxl_nvdimm_probe(struct device *dev) > +static int cxl_pmem_get_config_size(struct cxl_mem *cxlm, > + struct nd_cmd_get_config_size *cmd, > + unsigned int buf_len, int *cmd_rc) > +{ > + if (sizeof(*cmd) > buf_len) > + return -EINVAL; > + > + *cmd = (struct nd_cmd_get_config_size) { > + .config_size = cxlm->lsa_size, > + .max_xfer = cxlm->payload_size, > + }; > + *cmd_rc = 0; > + > + return 0; > +} > + > +static int cxl_pmem_get_config_data(struct cxl_mem *cxlm, > + struct nd_cmd_get_config_data_hdr *cmd, > + unsigned int buf_len, int *cmd_rc) > +{ > + struct cxl_mbox_get_lsa { > + u32 offset; > + u32 length; > + } get_lsa; > + int rc; > + > + if (sizeof(*cmd) > buf_len) > + return -EINVAL; > + if (struct_size(cmd, out_buf, cmd->in_length) > buf_len) > + return -EINVAL; > + > + get_lsa = (struct cxl_mbox_get_lsa) { > + .offset = cmd->in_offset, > + .length = cmd->in_length, > + }; > + > + rc = cxl_mem_mbox_send_cmd(cxlm, CXL_MBOX_OP_GET_LSA, &get_lsa, > + sizeof(get_lsa), cmd->out_buf, > + cmd->in_length); > + cmd->status = 0; > + *cmd_rc = 0; > + > + return rc; > +} > + > +static int cxl_pmem_set_config_data(struct cxl_mem *cxlm, > + struct nd_cmd_set_config_hdr *cmd, > + unsigned int buf_len, int *cmd_rc) > +{ > + struct cxl_mbox_set_lsa { > + u32 offset; > + u32 reserved; > + u8 data[]; > + } *set_lsa; > + int rc; > + > + if (sizeof(*cmd) > buf_len) > + return -EINVAL; > + > + /* 4-byte status follows the input data in the payload */ > + if (struct_size(cmd, in_buf, cmd->in_length) + 4 > buf_len) > + return -EINVAL; > + > + set_lsa = > + kvzalloc(struct_size(set_lsa, data, cmd->in_length), GFP_KERNEL); > + if (!set_lsa) > + return -ENOMEM; > + > + *set_lsa = (struct cxl_mbox_set_lsa) { > + .offset = cmd->in_offset, > + }; > + memcpy(set_lsa->data, cmd->in_buf, cmd->in_length); > + > + rc = cxl_mem_mbox_send_cmd(cxlm, CXL_MBOX_OP_SET_LSA, set_lsa, > + struct_size(set_lsa, data, cmd->in_length), > + NULL, 0); > + > + /* set "firmware" status */ > + *(u32 *) &cmd->in_buf[cmd->in_length] = 0; Are we guaranteed this is aligned? Not 'locally' obvious so maybe a comment? > + *cmd_rc = 0; > + kvfree(set_lsa); > + > + return rc; > +} > +
On Thu, Sep 2, 2021 at 11:22 AM Jonathan Cameron <Jonathan.Cameron@huawei.com> wrote: > > On Tue, 24 Aug 2021 09:07:18 -0700 > Dan Williams <dan.j.williams@intel.com> wrote: > > > The LIBNVDIMM IOCTL UAPI calls back to the nvdimm-bus-provider to > > translate the Linux command payload to the device native command format. > > The LIBNVDIMM commands get-config-size, get-config-data, and > > set-config-data, map to the CXL memory device commands device-identify, > > get-lsa, and set-lsa. Recall that the label-storage-area (LSA) on an > > NVDIMM device arranges for the provisioning of namespaces. Additionally > > for CXL the LSA is used for provisioning regions as well. > > > > The data from device-identify is already cached in the 'struct cxl_mem' > > instance associated with @cxl_nvd, so that payload return is simply > > crafted and no CXL command is issued. The conversion for get-lsa is > > straightforward, but the conversion for set-lsa requires an allocation > > to append the set-lsa header in front of the payload. > > > > Acked-by: Ben Widawsky <ben.widawsky@intel.com> > > Signed-off-by: Dan Williams <dan.j.williams@intel.com> > Minor query inline. > [..] > > +static int cxl_pmem_set_config_data(struct cxl_mem *cxlm, > > + struct nd_cmd_set_config_hdr *cmd, > > + unsigned int buf_len, int *cmd_rc) > > +{ > > + struct cxl_mbox_set_lsa { > > + u32 offset; > > + u32 reserved; > > + u8 data[]; > > + } *set_lsa; > > + int rc; > > + > > + if (sizeof(*cmd) > buf_len) > > + return -EINVAL; > > + > > + /* 4-byte status follows the input data in the payload */ > > + if (struct_size(cmd, in_buf, cmd->in_length) + 4 > buf_len) > > + return -EINVAL; > > + > > + set_lsa = > > + kvzalloc(struct_size(set_lsa, data, cmd->in_length), GFP_KERNEL); > > + if (!set_lsa) > > + return -ENOMEM; > > + > > + *set_lsa = (struct cxl_mbox_set_lsa) { > > + .offset = cmd->in_offset, > > + }; > > + memcpy(set_lsa->data, cmd->in_buf, cmd->in_length); > > + > > + rc = cxl_mem_mbox_send_cmd(cxlm, CXL_MBOX_OP_SET_LSA, set_lsa, > > + struct_size(set_lsa, data, cmd->in_length), > > + NULL, 0); > > + > > + /* set "firmware" status */ > > + *(u32 *) &cmd->in_buf[cmd->in_length] = 0; > > Are we guaranteed this is aligned? Not 'locally' obvious so maybe a comment? Good point, let's just go ahead and use a put_unaligned() accessor.
diff --git a/drivers/cxl/pmem.c b/drivers/cxl/pmem.c index 469b984176a2..6cc76302c8f8 100644 --- a/drivers/cxl/pmem.c +++ b/drivers/cxl/pmem.c @@ -52,10 +52,10 @@ static int cxl_nvdimm_probe(struct device *dev) { struct cxl_nvdimm *cxl_nvd = to_cxl_nvdimm(dev); struct cxl_memdev *cxlmd = cxl_nvd->cxlmd; + unsigned long flags = 0, cmd_mask = 0; struct cxl_mem *cxlm = cxlmd->cxlm; struct cxl_nvdimm_bridge *cxl_nvb; struct nvdimm *nvdimm = NULL; - unsigned long flags = 0; int rc = -ENXIO; cxl_nvb = cxl_find_nvdimm_bridge(); @@ -69,8 +69,11 @@ static int cxl_nvdimm_probe(struct device *dev) set_exclusive_cxl_commands(cxlm, exclusive_cmds); set_bit(NDD_LABELING, &flags); - nvdimm = nvdimm_create(cxl_nvb->nvdimm_bus, cxl_nvd, NULL, flags, 0, 0, - NULL); + set_bit(ND_CMD_GET_CONFIG_SIZE, &cmd_mask); + set_bit(ND_CMD_GET_CONFIG_DATA, &cmd_mask); + set_bit(ND_CMD_SET_CONFIG_DATA, &cmd_mask); + nvdimm = nvdimm_create(cxl_nvb->nvdimm_bus, cxl_nvd, NULL, flags, + cmd_mask, 0, NULL); dev_set_drvdata(dev, nvdimm); rc = devm_add_action_or_reset(dev, unregister_nvdimm, cxl_nvd); out: @@ -89,11 +92,121 @@ static struct cxl_driver cxl_nvdimm_driver = { .id = CXL_DEVICE_NVDIMM, }; +static int cxl_pmem_get_config_size(struct cxl_mem *cxlm, + struct nd_cmd_get_config_size *cmd, + unsigned int buf_len, int *cmd_rc) +{ + if (sizeof(*cmd) > buf_len) + return -EINVAL; + + *cmd = (struct nd_cmd_get_config_size) { + .config_size = cxlm->lsa_size, + .max_xfer = cxlm->payload_size, + }; + *cmd_rc = 0; + + return 0; +} + +static int cxl_pmem_get_config_data(struct cxl_mem *cxlm, + struct nd_cmd_get_config_data_hdr *cmd, + unsigned int buf_len, int *cmd_rc) +{ + struct cxl_mbox_get_lsa { + u32 offset; + u32 length; + } get_lsa; + int rc; + + if (sizeof(*cmd) > buf_len) + return -EINVAL; + if (struct_size(cmd, out_buf, cmd->in_length) > buf_len) + return -EINVAL; + + get_lsa = (struct cxl_mbox_get_lsa) { + .offset = cmd->in_offset, + .length = cmd->in_length, + }; + + rc = cxl_mem_mbox_send_cmd(cxlm, CXL_MBOX_OP_GET_LSA, &get_lsa, + sizeof(get_lsa), cmd->out_buf, + cmd->in_length); + cmd->status = 0; + *cmd_rc = 0; + + return rc; +} + +static int cxl_pmem_set_config_data(struct cxl_mem *cxlm, + struct nd_cmd_set_config_hdr *cmd, + unsigned int buf_len, int *cmd_rc) +{ + struct cxl_mbox_set_lsa { + u32 offset; + u32 reserved; + u8 data[]; + } *set_lsa; + int rc; + + if (sizeof(*cmd) > buf_len) + return -EINVAL; + + /* 4-byte status follows the input data in the payload */ + if (struct_size(cmd, in_buf, cmd->in_length) + 4 > buf_len) + return -EINVAL; + + set_lsa = + kvzalloc(struct_size(set_lsa, data, cmd->in_length), GFP_KERNEL); + if (!set_lsa) + return -ENOMEM; + + *set_lsa = (struct cxl_mbox_set_lsa) { + .offset = cmd->in_offset, + }; + memcpy(set_lsa->data, cmd->in_buf, cmd->in_length); + + rc = cxl_mem_mbox_send_cmd(cxlm, CXL_MBOX_OP_SET_LSA, set_lsa, + struct_size(set_lsa, data, cmd->in_length), + NULL, 0); + + /* set "firmware" status */ + *(u32 *) &cmd->in_buf[cmd->in_length] = 0; + *cmd_rc = 0; + kvfree(set_lsa); + + return rc; +} + +static int cxl_pmem_nvdimm_ctl(struct nvdimm *nvdimm, unsigned int cmd, + void *buf, unsigned int buf_len, int *cmd_rc) +{ + struct cxl_nvdimm *cxl_nvd = nvdimm_provider_data(nvdimm); + unsigned long cmd_mask = nvdimm_cmd_mask(nvdimm); + struct cxl_memdev *cxlmd = cxl_nvd->cxlmd; + struct cxl_mem *cxlm = cxlmd->cxlm; + + if (!test_bit(cmd, &cmd_mask)) + return -ENOTTY; + + switch (cmd) { + case ND_CMD_GET_CONFIG_SIZE: + return cxl_pmem_get_config_size(cxlm, buf, buf_len, cmd_rc); + case ND_CMD_GET_CONFIG_DATA: + return cxl_pmem_get_config_data(cxlm, buf, buf_len, cmd_rc); + case ND_CMD_SET_CONFIG_DATA: + return cxl_pmem_set_config_data(cxlm, buf, buf_len, cmd_rc); + default: + return -ENOTTY; + } +} + static int cxl_pmem_ctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm, unsigned int cmd, void *buf, unsigned int buf_len, int *cmd_rc) { - return -ENOTTY; + if (!nvdimm) + return -ENOTTY; + return cxl_pmem_nvdimm_ctl(nvdimm, cmd, buf, buf_len, cmd_rc); } static bool online_nvdimm_bus(struct cxl_nvdimm_bridge *cxl_nvb)