diff options
Diffstat (limited to 'drivers/cxl/core/mbox.c')
-rw-r--r-- | drivers/cxl/core/mbox.c | 102 |
1 files changed, 62 insertions, 40 deletions
diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c index 16176b9278b4..b03fba212799 100644 --- a/drivers/cxl/core/mbox.c +++ b/drivers/cxl/core/mbox.c @@ -140,13 +140,9 @@ static const char *cxl_mem_opcode_to_name(u16 opcode) } /** - * cxl_mbox_send_cmd() - Send a mailbox command to a device. + * cxl_internal_send_cmd() - Kernel internal interface to send a mailbox command * @cxlds: The device data for the operation - * @opcode: Opcode for the mailbox command. - * @in: The input payload for the mailbox command. - * @in_size: The length of the input payload - * @out: Caller allocated buffer for the output. - * @out_size: Expected size of output. + * @mbox_cmd: initialized command to execute * * Context: Any context. * Return: @@ -161,40 +157,40 @@ static const char *cxl_mem_opcode_to_name(u16 opcode) * error. While this distinction can be useful for commands from userspace, the * kernel will only be able to use results when both are successful. */ -int cxl_mbox_send_cmd(struct cxl_dev_state *cxlds, u16 opcode, void *in, - size_t in_size, void *out, size_t out_size) +int cxl_internal_send_cmd(struct cxl_dev_state *cxlds, + struct cxl_mbox_cmd *mbox_cmd) { - const struct cxl_mem_command *cmd = cxl_mem_find_command(opcode); - struct cxl_mbox_cmd mbox_cmd = { - .opcode = opcode, - .payload_in = in, - .size_in = in_size, - .size_out = out_size, - .payload_out = out, - }; + size_t out_size, min_out; int rc; - if (out_size > cxlds->payload_size) + if (mbox_cmd->size_in > cxlds->payload_size || + mbox_cmd->size_out > cxlds->payload_size) return -E2BIG; - rc = cxlds->mbox_send(cxlds, &mbox_cmd); + out_size = mbox_cmd->size_out; + min_out = mbox_cmd->min_out; + rc = cxlds->mbox_send(cxlds, mbox_cmd); if (rc) return rc; - if (mbox_cmd.return_code != CXL_MBOX_CMD_RC_SUCCESS) - return cxl_mbox_cmd_rc2errno(&mbox_cmd); + if (mbox_cmd->return_code != CXL_MBOX_CMD_RC_SUCCESS) + return cxl_mbox_cmd_rc2errno(mbox_cmd); + + if (!out_size) + return 0; /* - * Variable sized commands can't be validated and so it's up to the - * caller to do that if they wish. + * Variable sized output needs to at least satisfy the caller's + * minimum if not the fully requested size. */ - if (cmd->info.size_out != CXL_VARIABLE_PAYLOAD) { - if (mbox_cmd.size_out != out_size) - return -EIO; - } + if (min_out == 0) + min_out = out_size; + + if (mbox_cmd->size_out < min_out) + return -EIO; return 0; } -EXPORT_SYMBOL_NS_GPL(cxl_mbox_send_cmd, CXL); +EXPORT_SYMBOL_NS_GPL(cxl_internal_send_cmd, CXL); static bool cxl_mem_raw_command_allowed(u16 opcode) { @@ -561,15 +557,25 @@ static int cxl_xfer_log(struct cxl_dev_state *cxlds, uuid_t *uuid, u32 size, u8 while (remaining) { u32 xfer_size = min_t(u32, remaining, cxlds->payload_size); - struct cxl_mbox_get_log log = { + struct cxl_mbox_cmd mbox_cmd; + struct cxl_mbox_get_log log; + int rc; + + log = (struct cxl_mbox_get_log) { .uuid = *uuid, .offset = cpu_to_le32(offset), - .length = cpu_to_le32(xfer_size) + .length = cpu_to_le32(xfer_size), }; - int rc; - rc = cxl_mbox_send_cmd(cxlds, CXL_MBOX_OP_GET_LOG, &log, sizeof(log), - out, xfer_size); + mbox_cmd = (struct cxl_mbox_cmd) { + .opcode = CXL_MBOX_OP_GET_LOG, + .size_in = sizeof(log), + .payload_in = &log, + .size_out = xfer_size, + .payload_out = out, + }; + + rc = cxl_internal_send_cmd(cxlds, &mbox_cmd); if (rc < 0) return rc; @@ -615,19 +621,27 @@ static void cxl_walk_cel(struct cxl_dev_state *cxlds, size_t size, u8 *cel) static struct cxl_mbox_get_supported_logs *cxl_get_gsl(struct cxl_dev_state *cxlds) { struct cxl_mbox_get_supported_logs *ret; + struct cxl_mbox_cmd mbox_cmd; int rc; ret = kvmalloc(cxlds->payload_size, GFP_KERNEL); if (!ret) return ERR_PTR(-ENOMEM); - rc = cxl_mbox_send_cmd(cxlds, CXL_MBOX_OP_GET_SUPPORTED_LOGS, NULL, 0, ret, - cxlds->payload_size); + mbox_cmd = (struct cxl_mbox_cmd) { + .opcode = CXL_MBOX_OP_GET_SUPPORTED_LOGS, + .size_out = cxlds->payload_size, + .payload_out = ret, + /* At least the record number field must be valid */ + .min_out = 2, + }; + rc = cxl_internal_send_cmd(cxlds, &mbox_cmd); if (rc < 0) { kvfree(ret); return ERR_PTR(rc); } + return ret; } @@ -697,7 +711,6 @@ int cxl_enumerate_cmds(struct cxl_dev_state *cxlds) /* Found the required CEL */ rc = 0; } - out: kvfree(gsl); return rc; @@ -719,11 +732,15 @@ EXPORT_SYMBOL_NS_GPL(cxl_enumerate_cmds, CXL); static int cxl_mem_get_partition_info(struct cxl_dev_state *cxlds) { struct cxl_mbox_get_partition_info pi; + struct cxl_mbox_cmd mbox_cmd; int rc; - rc = cxl_mbox_send_cmd(cxlds, CXL_MBOX_OP_GET_PARTITION_INFO, NULL, 0, - &pi, sizeof(pi)); - + mbox_cmd = (struct cxl_mbox_cmd) { + .opcode = CXL_MBOX_OP_GET_PARTITION_INFO, + .size_out = sizeof(pi), + .payload_out = &pi, + }; + rc = cxl_internal_send_cmd(cxlds, &mbox_cmd); if (rc) return rc; @@ -752,10 +769,15 @@ int cxl_dev_state_identify(struct cxl_dev_state *cxlds) { /* See CXL 2.0 Table 175 Identify Memory Device Output Payload */ struct cxl_mbox_identify id; + struct cxl_mbox_cmd mbox_cmd; int rc; - rc = cxl_mbox_send_cmd(cxlds, CXL_MBOX_OP_IDENTIFY, NULL, 0, &id, - sizeof(id)); + mbox_cmd = (struct cxl_mbox_cmd) { + .opcode = CXL_MBOX_OP_IDENTIFY, + .size_out = sizeof(id), + .payload_out = &id, + }; + rc = cxl_internal_send_cmd(cxlds, &mbox_cmd); if (rc < 0) return rc; |