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![Colin Ian King](/assets/img/avatar_default.png)
A null check before a kfree is redundant, so remove it. Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1004 lines
27 KiB
C
1004 lines
27 KiB
C
/*
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* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Oracle Data Analytics Accelerator (DAX)
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*
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* DAX is a coprocessor which resides on the SPARC M7 (DAX1) and M8
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* (DAX2) processor chips, and has direct access to the CPU's L3
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* caches as well as physical memory. It can perform several
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* operations on data streams with various input and output formats.
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* The driver provides a transport mechanism only and has limited
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* knowledge of the various opcodes and data formats. A user space
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* library provides high level services and translates these into low
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* level commands which are then passed into the driver and
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* subsequently the hypervisor and the coprocessor. The library is
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* the recommended way for applications to use the coprocessor, and
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* the driver interface is not intended for general use.
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*
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* See Documentation/sparc/oradax/oracle-dax.txt for more details.
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*/
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#include <linux/uaccess.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/cdev.h>
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#include <linux/slab.h>
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#include <linux/mm.h>
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#include <asm/hypervisor.h>
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#include <asm/mdesc.h>
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#include <asm/oradax.h>
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Driver for Oracle Data Analytics Accelerator");
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#define DAX_DBG_FLG_BASIC 0x01
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#define DAX_DBG_FLG_STAT 0x02
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#define DAX_DBG_FLG_INFO 0x04
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#define DAX_DBG_FLG_ALL 0xff
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#define dax_err(fmt, ...) pr_err("%s: " fmt "\n", __func__, ##__VA_ARGS__)
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#define dax_info(fmt, ...) pr_info("%s: " fmt "\n", __func__, ##__VA_ARGS__)
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#define dax_dbg(fmt, ...) do { \
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if (dax_debug & DAX_DBG_FLG_BASIC)\
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dax_info(fmt, ##__VA_ARGS__); \
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} while (0)
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#define dax_stat_dbg(fmt, ...) do { \
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if (dax_debug & DAX_DBG_FLG_STAT) \
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dax_info(fmt, ##__VA_ARGS__); \
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} while (0)
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#define dax_info_dbg(fmt, ...) do { \
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if (dax_debug & DAX_DBG_FLG_INFO) \
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dax_info(fmt, ##__VA_ARGS__); \
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} while (0)
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#define DAX1_MINOR 1
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#define DAX1_MAJOR 1
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#define DAX2_MINOR 0
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#define DAX2_MAJOR 2
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#define DAX1_STR "ORCL,sun4v-dax"
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#define DAX2_STR "ORCL,sun4v-dax2"
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#define DAX_CA_ELEMS (DAX_MMAP_LEN / sizeof(struct dax_cca))
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#define DAX_CCB_USEC 100
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#define DAX_CCB_RETRIES 10000
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/* stream types */
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enum {
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OUT,
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PRI,
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SEC,
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TBL,
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NUM_STREAM_TYPES
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};
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/* completion status */
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#define CCA_STAT_NOT_COMPLETED 0
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#define CCA_STAT_COMPLETED 1
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#define CCA_STAT_FAILED 2
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#define CCA_STAT_KILLED 3
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#define CCA_STAT_NOT_RUN 4
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#define CCA_STAT_PIPE_OUT 5
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#define CCA_STAT_PIPE_SRC 6
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#define CCA_STAT_PIPE_DST 7
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/* completion err */
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#define CCA_ERR_SUCCESS 0x0 /* no error */
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#define CCA_ERR_OVERFLOW 0x1 /* buffer overflow */
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#define CCA_ERR_DECODE 0x2 /* CCB decode error */
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#define CCA_ERR_PAGE_OVERFLOW 0x3 /* page overflow */
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#define CCA_ERR_KILLED 0x7 /* command was killed */
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#define CCA_ERR_TIMEOUT 0x8 /* Timeout */
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#define CCA_ERR_ADI 0x9 /* ADI error */
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#define CCA_ERR_DATA_FMT 0xA /* data format error */
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#define CCA_ERR_OTHER_NO_RETRY 0xE /* Other error, do not retry */
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#define CCA_ERR_OTHER_RETRY 0xF /* Other error, retry */
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#define CCA_ERR_PARTIAL_SYMBOL 0x80 /* QP partial symbol warning */
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/* CCB address types */
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#define DAX_ADDR_TYPE_NONE 0
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#define DAX_ADDR_TYPE_VA_ALT 1 /* secondary context */
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#define DAX_ADDR_TYPE_RA 2 /* real address */
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#define DAX_ADDR_TYPE_VA 3 /* virtual address */
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/* dax_header_t opcode */
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#define DAX_OP_SYNC_NOP 0x0
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#define DAX_OP_EXTRACT 0x1
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#define DAX_OP_SCAN_VALUE 0x2
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#define DAX_OP_SCAN_RANGE 0x3
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#define DAX_OP_TRANSLATE 0x4
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#define DAX_OP_SELECT 0x5
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#define DAX_OP_INVERT 0x10 /* OR with translate, scan opcodes */
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struct dax_header {
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u32 ccb_version:4; /* 31:28 CCB Version */
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/* 27:24 Sync Flags */
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u32 pipe:1; /* Pipeline */
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u32 longccb:1; /* Longccb. Set for scan with lu2, lu3, lu4. */
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u32 cond:1; /* Conditional */
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u32 serial:1; /* Serial */
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u32 opcode:8; /* 23:16 Opcode */
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/* 15:0 Address Type. */
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u32 reserved:3; /* 15:13 reserved */
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u32 table_addr_type:2; /* 12:11 Huffman Table Address Type */
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u32 out_addr_type:3; /* 10:8 Destination Address Type */
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u32 sec_addr_type:3; /* 7:5 Secondary Source Address Type */
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u32 pri_addr_type:3; /* 4:2 Primary Source Address Type */
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u32 cca_addr_type:2; /* 1:0 Completion Address Type */
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};
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struct dax_control {
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u32 pri_fmt:4; /* 31:28 Primary Input Format */
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u32 pri_elem_size:5; /* 27:23 Primary Input Element Size(less1) */
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u32 pri_offset:3; /* 22:20 Primary Input Starting Offset */
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u32 sec_encoding:1; /* 19 Secondary Input Encoding */
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/* (must be 0 for Select) */
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u32 sec_offset:3; /* 18:16 Secondary Input Starting Offset */
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u32 sec_elem_size:2; /* 15:14 Secondary Input Element Size */
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/* (must be 0 for Select) */
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u32 out_fmt:2; /* 13:12 Output Format */
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u32 out_elem_size:2; /* 11:10 Output Element Size */
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u32 misc:10; /* 9:0 Opcode specific info */
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};
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struct dax_data_access {
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u64 flow_ctrl:2; /* 63:62 Flow Control Type */
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u64 pipe_target:2; /* 61:60 Pipeline Target */
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u64 out_buf_size:20; /* 59:40 Output Buffer Size */
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/* (cachelines less 1) */
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u64 unused1:8; /* 39:32 Reserved, Set to 0 */
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u64 out_alloc:5; /* 31:27 Output Allocation */
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u64 unused2:1; /* 26 Reserved */
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u64 pri_len_fmt:2; /* 25:24 Input Length Format */
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u64 pri_len:24; /* 23:0 Input Element/Byte/Bit Count */
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/* (less 1) */
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};
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struct dax_ccb {
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struct dax_header hdr; /* CCB Header */
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struct dax_control ctrl;/* Control Word */
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void *ca; /* Completion Address */
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void *pri; /* Primary Input Address */
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struct dax_data_access dac; /* Data Access Control */
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void *sec; /* Secondary Input Address */
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u64 dword5; /* depends on opcode */
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void *out; /* Output Address */
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void *tbl; /* Table Address or bitmap */
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};
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struct dax_cca {
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u8 status; /* user may mwait on this address */
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u8 err; /* user visible error notification */
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u8 rsvd[2]; /* reserved */
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u32 n_remaining; /* for QP partial symbol warning */
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u32 output_sz; /* output in bytes */
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u32 rsvd2; /* reserved */
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u64 run_cycles; /* run time in OCND2 cycles */
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u64 run_stats; /* nothing reported in version 1.0 */
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u32 n_processed; /* number input elements */
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u32 rsvd3[5]; /* reserved */
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u64 retval; /* command return value */
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u64 rsvd4[8]; /* reserved */
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};
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/* per thread CCB context */
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struct dax_ctx {
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struct dax_ccb *ccb_buf;
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u64 ccb_buf_ra; /* cached RA of ccb_buf */
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struct dax_cca *ca_buf;
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u64 ca_buf_ra; /* cached RA of ca_buf */
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struct page *pages[DAX_CA_ELEMS][NUM_STREAM_TYPES];
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/* array of locked pages */
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struct task_struct *owner; /* thread that owns ctx */
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struct task_struct *client; /* requesting thread */
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union ccb_result result;
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u32 ccb_count;
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u32 fail_count;
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};
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/* driver public entry points */
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static int dax_open(struct inode *inode, struct file *file);
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static ssize_t dax_read(struct file *filp, char __user *buf,
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size_t count, loff_t *ppos);
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static ssize_t dax_write(struct file *filp, const char __user *buf,
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size_t count, loff_t *ppos);
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static int dax_devmap(struct file *f, struct vm_area_struct *vma);
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static int dax_close(struct inode *i, struct file *f);
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static const struct file_operations dax_fops = {
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.owner = THIS_MODULE,
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.open = dax_open,
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.read = dax_read,
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.write = dax_write,
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.mmap = dax_devmap,
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.release = dax_close,
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};
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static int dax_ccb_exec(struct dax_ctx *ctx, const char __user *buf,
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size_t count, loff_t *ppos);
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static int dax_ccb_info(u64 ca, struct ccb_info_result *info);
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static int dax_ccb_kill(u64 ca, u16 *kill_res);
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static struct cdev c_dev;
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static struct class *cl;
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static dev_t first;
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static int max_ccb_version;
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static int dax_debug;
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module_param(dax_debug, int, 0644);
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MODULE_PARM_DESC(dax_debug, "Debug flags");
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static int __init dax_attach(void)
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{
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unsigned long dummy, hv_rv, major, minor, minor_requested, max_ccbs;
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struct mdesc_handle *hp = mdesc_grab();
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char *prop, *dax_name;
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bool found = false;
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int len, ret = 0;
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u64 pn;
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if (hp == NULL) {
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dax_err("Unable to grab mdesc");
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return -ENODEV;
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}
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mdesc_for_each_node_by_name(hp, pn, "virtual-device") {
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prop = (char *)mdesc_get_property(hp, pn, "name", &len);
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if (prop == NULL)
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continue;
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if (strncmp(prop, "dax", strlen("dax")))
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continue;
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dax_dbg("Found node 0x%llx = %s", pn, prop);
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prop = (char *)mdesc_get_property(hp, pn, "compatible", &len);
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if (prop == NULL)
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continue;
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dax_dbg("Found node 0x%llx = %s", pn, prop);
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found = true;
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break;
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}
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if (!found) {
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dax_err("No DAX device found");
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ret = -ENODEV;
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goto done;
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}
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if (strncmp(prop, DAX2_STR, strlen(DAX2_STR)) == 0) {
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dax_name = DAX_NAME "2";
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major = DAX2_MAJOR;
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minor_requested = DAX2_MINOR;
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max_ccb_version = 1;
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dax_dbg("MD indicates DAX2 coprocessor");
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} else if (strncmp(prop, DAX1_STR, strlen(DAX1_STR)) == 0) {
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dax_name = DAX_NAME "1";
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major = DAX1_MAJOR;
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minor_requested = DAX1_MINOR;
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max_ccb_version = 0;
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dax_dbg("MD indicates DAX1 coprocessor");
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} else {
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dax_err("Unknown dax type: %s", prop);
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ret = -ENODEV;
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goto done;
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}
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minor = minor_requested;
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dax_dbg("Registering DAX HV api with major %ld minor %ld", major,
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minor);
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if (sun4v_hvapi_register(HV_GRP_DAX, major, &minor)) {
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dax_err("hvapi_register failed");
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ret = -ENODEV;
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goto done;
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} else {
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dax_dbg("Max minor supported by HV = %ld (major %ld)", minor,
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major);
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minor = min(minor, minor_requested);
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dax_dbg("registered DAX major %ld minor %ld", major, minor);
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}
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/* submit a zero length ccb array to query coprocessor queue size */
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hv_rv = sun4v_ccb_submit(0, 0, HV_CCB_QUERY_CMD, 0, &max_ccbs, &dummy);
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if (hv_rv != 0) {
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dax_err("get_hwqueue_size failed with status=%ld and max_ccbs=%ld",
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hv_rv, max_ccbs);
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ret = -ENODEV;
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goto done;
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}
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if (max_ccbs != DAX_MAX_CCBS) {
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dax_err("HV reports unsupported max_ccbs=%ld", max_ccbs);
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ret = -ENODEV;
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goto done;
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}
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if (alloc_chrdev_region(&first, 0, 1, DAX_NAME) < 0) {
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dax_err("alloc_chrdev_region failed");
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ret = -ENXIO;
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goto done;
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}
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cl = class_create(THIS_MODULE, DAX_NAME);
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if (IS_ERR(cl)) {
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dax_err("class_create failed");
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ret = PTR_ERR(cl);
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goto class_error;
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}
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if (device_create(cl, NULL, first, NULL, dax_name) == NULL) {
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dax_err("device_create failed");
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ret = -ENXIO;
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goto device_error;
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}
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cdev_init(&c_dev, &dax_fops);
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if (cdev_add(&c_dev, first, 1) == -1) {
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dax_err("cdev_add failed");
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ret = -ENXIO;
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goto cdev_error;
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}
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pr_info("Attached DAX module\n");
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goto done;
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cdev_error:
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device_destroy(cl, first);
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device_error:
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class_destroy(cl);
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class_error:
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unregister_chrdev_region(first, 1);
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done:
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mdesc_release(hp);
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return ret;
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}
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module_init(dax_attach);
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static void __exit dax_detach(void)
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{
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pr_info("Cleaning up DAX module\n");
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cdev_del(&c_dev);
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device_destroy(cl, first);
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class_destroy(cl);
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unregister_chrdev_region(first, 1);
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}
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module_exit(dax_detach);
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/* map completion area */
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static int dax_devmap(struct file *f, struct vm_area_struct *vma)
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{
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struct dax_ctx *ctx = (struct dax_ctx *)f->private_data;
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size_t len = vma->vm_end - vma->vm_start;
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dax_dbg("len=0x%lx, flags=0x%lx", len, vma->vm_flags);
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if (ctx->owner != current) {
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dax_dbg("devmap called from wrong thread");
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return -EINVAL;
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}
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if (len != DAX_MMAP_LEN) {
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dax_dbg("len(%lu) != DAX_MMAP_LEN(%d)", len, DAX_MMAP_LEN);
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return -EINVAL;
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}
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/* completion area is mapped read-only for user */
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if (vma->vm_flags & VM_WRITE)
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return -EPERM;
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vma->vm_flags &= ~VM_MAYWRITE;
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if (remap_pfn_range(vma, vma->vm_start, ctx->ca_buf_ra >> PAGE_SHIFT,
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len, vma->vm_page_prot))
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return -EAGAIN;
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dax_dbg("mmapped completion area at uva 0x%lx", vma->vm_start);
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return 0;
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}
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/* Unlock user pages. Called during dequeue or device close */
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static void dax_unlock_pages(struct dax_ctx *ctx, int ccb_index, int nelem)
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{
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int i, j;
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for (i = ccb_index; i < ccb_index + nelem; i++) {
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for (j = 0; j < NUM_STREAM_TYPES; j++) {
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struct page *p = ctx->pages[i][j];
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if (p) {
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dax_dbg("freeing page %p", p);
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if (j == OUT)
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set_page_dirty(p);
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put_page(p);
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ctx->pages[i][j] = NULL;
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}
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}
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}
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}
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static int dax_lock_page(void *va, struct page **p)
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{
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int ret;
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dax_dbg("uva %p", va);
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ret = get_user_pages_fast((unsigned long)va, 1, 1, p);
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if (ret == 1) {
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dax_dbg("locked page %p, for VA %p", *p, va);
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return 0;
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}
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dax_dbg("get_user_pages failed, va=%p, ret=%d", va, ret);
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return -1;
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}
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static int dax_lock_pages(struct dax_ctx *ctx, int idx,
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int nelem, u64 *err_va)
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{
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int i;
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for (i = 0; i < nelem; i++) {
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struct dax_ccb *ccbp = &ctx->ccb_buf[i];
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/*
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* For each address in the CCB whose type is virtual,
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* lock the page and change the type to virtual alternate
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* context. On error, return the offending address in
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* err_va.
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*/
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|
if (ccbp->hdr.out_addr_type == DAX_ADDR_TYPE_VA) {
|
|
dax_dbg("output");
|
|
if (dax_lock_page(ccbp->out,
|
|
&ctx->pages[i + idx][OUT]) != 0) {
|
|
*err_va = (u64)ccbp->out;
|
|
goto error;
|
|
}
|
|
ccbp->hdr.out_addr_type = DAX_ADDR_TYPE_VA_ALT;
|
|
}
|
|
|
|
if (ccbp->hdr.pri_addr_type == DAX_ADDR_TYPE_VA) {
|
|
dax_dbg("input");
|
|
if (dax_lock_page(ccbp->pri,
|
|
&ctx->pages[i + idx][PRI]) != 0) {
|
|
*err_va = (u64)ccbp->pri;
|
|
goto error;
|
|
}
|
|
ccbp->hdr.pri_addr_type = DAX_ADDR_TYPE_VA_ALT;
|
|
}
|
|
|
|
if (ccbp->hdr.sec_addr_type == DAX_ADDR_TYPE_VA) {
|
|
dax_dbg("sec input");
|
|
if (dax_lock_page(ccbp->sec,
|
|
&ctx->pages[i + idx][SEC]) != 0) {
|
|
*err_va = (u64)ccbp->sec;
|
|
goto error;
|
|
}
|
|
ccbp->hdr.sec_addr_type = DAX_ADDR_TYPE_VA_ALT;
|
|
}
|
|
|
|
if (ccbp->hdr.table_addr_type == DAX_ADDR_TYPE_VA) {
|
|
dax_dbg("tbl");
|
|
if (dax_lock_page(ccbp->tbl,
|
|
&ctx->pages[i + idx][TBL]) != 0) {
|
|
*err_va = (u64)ccbp->tbl;
|
|
goto error;
|
|
}
|
|
ccbp->hdr.table_addr_type = DAX_ADDR_TYPE_VA_ALT;
|
|
}
|
|
|
|
/* skip over 2nd 64 bytes of long CCB */
|
|
if (ccbp->hdr.longccb)
|
|
i++;
|
|
}
|
|
return DAX_SUBMIT_OK;
|
|
|
|
error:
|
|
dax_unlock_pages(ctx, idx, nelem);
|
|
return DAX_SUBMIT_ERR_NOACCESS;
|
|
}
|
|
|
|
static void dax_ccb_wait(struct dax_ctx *ctx, int idx)
|
|
{
|
|
int ret, nretries;
|
|
u16 kill_res;
|
|
|
|
dax_dbg("idx=%d", idx);
|
|
|
|
for (nretries = 0; nretries < DAX_CCB_RETRIES; nretries++) {
|
|
if (ctx->ca_buf[idx].status == CCA_STAT_NOT_COMPLETED)
|
|
udelay(DAX_CCB_USEC);
|
|
else
|
|
return;
|
|
}
|
|
dax_dbg("ctx (%p): CCB[%d] timed out, wait usec=%d, retries=%d. Killing ccb",
|
|
(void *)ctx, idx, DAX_CCB_USEC, DAX_CCB_RETRIES);
|
|
|
|
ret = dax_ccb_kill(ctx->ca_buf_ra + idx * sizeof(struct dax_cca),
|
|
&kill_res);
|
|
dax_dbg("Kill CCB[%d] %s", idx, ret ? "failed" : "succeeded");
|
|
}
|
|
|
|
static int dax_close(struct inode *ino, struct file *f)
|
|
{
|
|
struct dax_ctx *ctx = (struct dax_ctx *)f->private_data;
|
|
int i;
|
|
|
|
f->private_data = NULL;
|
|
|
|
for (i = 0; i < DAX_CA_ELEMS; i++) {
|
|
if (ctx->ca_buf[i].status == CCA_STAT_NOT_COMPLETED) {
|
|
dax_dbg("CCB[%d] not completed", i);
|
|
dax_ccb_wait(ctx, i);
|
|
}
|
|
dax_unlock_pages(ctx, i, 1);
|
|
}
|
|
|
|
kfree(ctx->ccb_buf);
|
|
kfree(ctx->ca_buf);
|
|
dax_stat_dbg("CCBs: %d good, %d bad", ctx->ccb_count, ctx->fail_count);
|
|
kfree(ctx);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t dax_read(struct file *f, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct dax_ctx *ctx = f->private_data;
|
|
|
|
if (ctx->client != current)
|
|
return -EUSERS;
|
|
|
|
ctx->client = NULL;
|
|
|
|
if (count != sizeof(union ccb_result))
|
|
return -EINVAL;
|
|
if (copy_to_user(buf, &ctx->result, sizeof(union ccb_result)))
|
|
return -EFAULT;
|
|
return count;
|
|
}
|
|
|
|
static ssize_t dax_write(struct file *f, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct dax_ctx *ctx = f->private_data;
|
|
struct dax_command hdr;
|
|
unsigned long ca;
|
|
int i, idx, ret;
|
|
|
|
if (ctx->client != NULL)
|
|
return -EINVAL;
|
|
|
|
if (count == 0 || count > DAX_MAX_CCBS * sizeof(struct dax_ccb))
|
|
return -EINVAL;
|
|
|
|
if (count % sizeof(struct dax_ccb) == 0)
|
|
return dax_ccb_exec(ctx, buf, count, ppos); /* CCB EXEC */
|
|
|
|
if (count != sizeof(struct dax_command))
|
|
return -EINVAL;
|
|
|
|
/* immediate command */
|
|
if (ctx->owner != current)
|
|
return -EUSERS;
|
|
|
|
if (copy_from_user(&hdr, buf, sizeof(hdr)))
|
|
return -EFAULT;
|
|
|
|
ca = ctx->ca_buf_ra + hdr.ca_offset;
|
|
|
|
switch (hdr.command) {
|
|
case CCB_KILL:
|
|
if (hdr.ca_offset >= DAX_MMAP_LEN) {
|
|
dax_dbg("invalid ca_offset (%d) >= ca_buflen (%d)",
|
|
hdr.ca_offset, DAX_MMAP_LEN);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = dax_ccb_kill(ca, &ctx->result.kill.action);
|
|
if (ret != 0) {
|
|
dax_dbg("dax_ccb_kill failed (ret=%d)", ret);
|
|
return ret;
|
|
}
|
|
|
|
dax_info_dbg("killed (ca_offset %d)", hdr.ca_offset);
|
|
idx = hdr.ca_offset / sizeof(struct dax_cca);
|
|
ctx->ca_buf[idx].status = CCA_STAT_KILLED;
|
|
ctx->ca_buf[idx].err = CCA_ERR_KILLED;
|
|
ctx->client = current;
|
|
return count;
|
|
|
|
case CCB_INFO:
|
|
if (hdr.ca_offset >= DAX_MMAP_LEN) {
|
|
dax_dbg("invalid ca_offset (%d) >= ca_buflen (%d)",
|
|
hdr.ca_offset, DAX_MMAP_LEN);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = dax_ccb_info(ca, &ctx->result.info);
|
|
if (ret != 0) {
|
|
dax_dbg("dax_ccb_info failed (ret=%d)", ret);
|
|
return ret;
|
|
}
|
|
|
|
dax_info_dbg("info succeeded on ca_offset %d", hdr.ca_offset);
|
|
ctx->client = current;
|
|
return count;
|
|
|
|
case CCB_DEQUEUE:
|
|
for (i = 0; i < DAX_CA_ELEMS; i++) {
|
|
if (ctx->ca_buf[i].status !=
|
|
CCA_STAT_NOT_COMPLETED)
|
|
dax_unlock_pages(ctx, i, 1);
|
|
}
|
|
return count;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static int dax_open(struct inode *inode, struct file *f)
|
|
{
|
|
struct dax_ctx *ctx = NULL;
|
|
int i;
|
|
|
|
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
|
|
if (ctx == NULL)
|
|
goto done;
|
|
|
|
ctx->ccb_buf = kcalloc(DAX_MAX_CCBS, sizeof(struct dax_ccb),
|
|
GFP_KERNEL);
|
|
if (ctx->ccb_buf == NULL)
|
|
goto done;
|
|
|
|
ctx->ccb_buf_ra = virt_to_phys(ctx->ccb_buf);
|
|
dax_dbg("ctx->ccb_buf=0x%p, ccb_buf_ra=0x%llx",
|
|
(void *)ctx->ccb_buf, ctx->ccb_buf_ra);
|
|
|
|
/* allocate CCB completion area buffer */
|
|
ctx->ca_buf = kzalloc(DAX_MMAP_LEN, GFP_KERNEL);
|
|
if (ctx->ca_buf == NULL)
|
|
goto alloc_error;
|
|
for (i = 0; i < DAX_CA_ELEMS; i++)
|
|
ctx->ca_buf[i].status = CCA_STAT_COMPLETED;
|
|
|
|
ctx->ca_buf_ra = virt_to_phys(ctx->ca_buf);
|
|
dax_dbg("ctx=0x%p, ctx->ca_buf=0x%p, ca_buf_ra=0x%llx",
|
|
(void *)ctx, (void *)ctx->ca_buf, ctx->ca_buf_ra);
|
|
|
|
ctx->owner = current;
|
|
f->private_data = ctx;
|
|
return 0;
|
|
|
|
alloc_error:
|
|
kfree(ctx->ccb_buf);
|
|
done:
|
|
kfree(ctx);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static char *dax_hv_errno(unsigned long hv_ret, int *ret)
|
|
{
|
|
switch (hv_ret) {
|
|
case HV_EBADALIGN:
|
|
*ret = -EFAULT;
|
|
return "HV_EBADALIGN";
|
|
case HV_ENORADDR:
|
|
*ret = -EFAULT;
|
|
return "HV_ENORADDR";
|
|
case HV_EINVAL:
|
|
*ret = -EINVAL;
|
|
return "HV_EINVAL";
|
|
case HV_EWOULDBLOCK:
|
|
*ret = -EAGAIN;
|
|
return "HV_EWOULDBLOCK";
|
|
case HV_ENOACCESS:
|
|
*ret = -EPERM;
|
|
return "HV_ENOACCESS";
|
|
default:
|
|
break;
|
|
}
|
|
|
|
*ret = -EIO;
|
|
return "UNKNOWN";
|
|
}
|
|
|
|
static int dax_ccb_kill(u64 ca, u16 *kill_res)
|
|
{
|
|
unsigned long hv_ret;
|
|
int count, ret = 0;
|
|
char *err_str;
|
|
|
|
for (count = 0; count < DAX_CCB_RETRIES; count++) {
|
|
dax_dbg("attempting kill on ca_ra 0x%llx", ca);
|
|
hv_ret = sun4v_ccb_kill(ca, kill_res);
|
|
|
|
if (hv_ret == HV_EOK) {
|
|
dax_info_dbg("HV_EOK (ca_ra 0x%llx): %d", ca,
|
|
*kill_res);
|
|
} else {
|
|
err_str = dax_hv_errno(hv_ret, &ret);
|
|
dax_dbg("%s (ca_ra 0x%llx)", err_str, ca);
|
|
}
|
|
|
|
if (ret != -EAGAIN)
|
|
return ret;
|
|
dax_info_dbg("ccb_kill count = %d", count);
|
|
udelay(DAX_CCB_USEC);
|
|
}
|
|
|
|
return -EAGAIN;
|
|
}
|
|
|
|
static int dax_ccb_info(u64 ca, struct ccb_info_result *info)
|
|
{
|
|
unsigned long hv_ret;
|
|
char *err_str;
|
|
int ret = 0;
|
|
|
|
dax_dbg("attempting info on ca_ra 0x%llx", ca);
|
|
hv_ret = sun4v_ccb_info(ca, info);
|
|
|
|
if (hv_ret == HV_EOK) {
|
|
dax_info_dbg("HV_EOK (ca_ra 0x%llx): %d", ca, info->state);
|
|
if (info->state == DAX_CCB_ENQUEUED) {
|
|
dax_info_dbg("dax_unit %d, queue_num %d, queue_pos %d",
|
|
info->inst_num, info->q_num, info->q_pos);
|
|
}
|
|
} else {
|
|
err_str = dax_hv_errno(hv_ret, &ret);
|
|
dax_dbg("%s (ca_ra 0x%llx)", err_str, ca);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void dax_prt_ccbs(struct dax_ccb *ccb, int nelem)
|
|
{
|
|
int i, j;
|
|
u64 *ccbp;
|
|
|
|
dax_dbg("ccb buffer:");
|
|
for (i = 0; i < nelem; i++) {
|
|
ccbp = (u64 *)&ccb[i];
|
|
dax_dbg(" %sccb[%d]", ccb[i].hdr.longccb ? "long " : "", i);
|
|
for (j = 0; j < 8; j++)
|
|
dax_dbg("\tccb[%d].dwords[%d]=0x%llx",
|
|
i, j, *(ccbp + j));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Validates user CCB content. Also sets completion address and address types
|
|
* for all addresses contained in CCB.
|
|
*/
|
|
static int dax_preprocess_usr_ccbs(struct dax_ctx *ctx, int idx, int nelem)
|
|
{
|
|
int i;
|
|
|
|
/*
|
|
* The user is not allowed to specify real address types in
|
|
* the CCB header. This must be enforced by the kernel before
|
|
* submitting the CCBs to HV. The only allowed values for all
|
|
* address fields are VA or IMM
|
|
*/
|
|
for (i = 0; i < nelem; i++) {
|
|
struct dax_ccb *ccbp = &ctx->ccb_buf[i];
|
|
unsigned long ca_offset;
|
|
|
|
if (ccbp->hdr.ccb_version > max_ccb_version)
|
|
return DAX_SUBMIT_ERR_CCB_INVAL;
|
|
|
|
switch (ccbp->hdr.opcode) {
|
|
case DAX_OP_SYNC_NOP:
|
|
case DAX_OP_EXTRACT:
|
|
case DAX_OP_SCAN_VALUE:
|
|
case DAX_OP_SCAN_RANGE:
|
|
case DAX_OP_TRANSLATE:
|
|
case DAX_OP_SCAN_VALUE | DAX_OP_INVERT:
|
|
case DAX_OP_SCAN_RANGE | DAX_OP_INVERT:
|
|
case DAX_OP_TRANSLATE | DAX_OP_INVERT:
|
|
case DAX_OP_SELECT:
|
|
break;
|
|
default:
|
|
return DAX_SUBMIT_ERR_CCB_INVAL;
|
|
}
|
|
|
|
if (ccbp->hdr.out_addr_type != DAX_ADDR_TYPE_VA &&
|
|
ccbp->hdr.out_addr_type != DAX_ADDR_TYPE_NONE) {
|
|
dax_dbg("invalid out_addr_type in user CCB[%d]", i);
|
|
return DAX_SUBMIT_ERR_CCB_INVAL;
|
|
}
|
|
|
|
if (ccbp->hdr.pri_addr_type != DAX_ADDR_TYPE_VA &&
|
|
ccbp->hdr.pri_addr_type != DAX_ADDR_TYPE_NONE) {
|
|
dax_dbg("invalid pri_addr_type in user CCB[%d]", i);
|
|
return DAX_SUBMIT_ERR_CCB_INVAL;
|
|
}
|
|
|
|
if (ccbp->hdr.sec_addr_type != DAX_ADDR_TYPE_VA &&
|
|
ccbp->hdr.sec_addr_type != DAX_ADDR_TYPE_NONE) {
|
|
dax_dbg("invalid sec_addr_type in user CCB[%d]", i);
|
|
return DAX_SUBMIT_ERR_CCB_INVAL;
|
|
}
|
|
|
|
if (ccbp->hdr.table_addr_type != DAX_ADDR_TYPE_VA &&
|
|
ccbp->hdr.table_addr_type != DAX_ADDR_TYPE_NONE) {
|
|
dax_dbg("invalid table_addr_type in user CCB[%d]", i);
|
|
return DAX_SUBMIT_ERR_CCB_INVAL;
|
|
}
|
|
|
|
/* set completion (real) address and address type */
|
|
ccbp->hdr.cca_addr_type = DAX_ADDR_TYPE_RA;
|
|
ca_offset = (idx + i) * sizeof(struct dax_cca);
|
|
ccbp->ca = (void *)ctx->ca_buf_ra + ca_offset;
|
|
memset(&ctx->ca_buf[idx + i], 0, sizeof(struct dax_cca));
|
|
|
|
dax_dbg("ccb[%d]=%p, ca_offset=0x%lx, compl RA=0x%llx",
|
|
i, ccbp, ca_offset, ctx->ca_buf_ra + ca_offset);
|
|
|
|
/* skip over 2nd 64 bytes of long CCB */
|
|
if (ccbp->hdr.longccb)
|
|
i++;
|
|
}
|
|
|
|
return DAX_SUBMIT_OK;
|
|
}
|
|
|
|
static int dax_ccb_exec(struct dax_ctx *ctx, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
unsigned long accepted_len, hv_rv;
|
|
int i, idx, nccbs, naccepted;
|
|
|
|
ctx->client = current;
|
|
idx = *ppos;
|
|
nccbs = count / sizeof(struct dax_ccb);
|
|
|
|
if (ctx->owner != current) {
|
|
dax_dbg("wrong thread");
|
|
ctx->result.exec.status = DAX_SUBMIT_ERR_THR_INIT;
|
|
return 0;
|
|
}
|
|
dax_dbg("args: ccb_buf_len=%ld, idx=%d", count, idx);
|
|
|
|
/* for given index and length, verify ca_buf range exists */
|
|
if (idx < 0 || idx > (DAX_CA_ELEMS - nccbs)) {
|
|
ctx->result.exec.status = DAX_SUBMIT_ERR_NO_CA_AVAIL;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Copy CCBs into kernel buffer to prevent modification by the
|
|
* user in between validation and submission.
|
|
*/
|
|
if (copy_from_user(ctx->ccb_buf, buf, count)) {
|
|
dax_dbg("copyin of user CCB buffer failed");
|
|
ctx->result.exec.status = DAX_SUBMIT_ERR_CCB_ARR_MMU_MISS;
|
|
return 0;
|
|
}
|
|
|
|
/* check to see if ca_buf[idx] .. ca_buf[idx + nccbs] are available */
|
|
for (i = idx; i < idx + nccbs; i++) {
|
|
if (ctx->ca_buf[i].status == CCA_STAT_NOT_COMPLETED) {
|
|
dax_dbg("CA range not available, dequeue needed");
|
|
ctx->result.exec.status = DAX_SUBMIT_ERR_NO_CA_AVAIL;
|
|
return 0;
|
|
}
|
|
}
|
|
dax_unlock_pages(ctx, idx, nccbs);
|
|
|
|
ctx->result.exec.status = dax_preprocess_usr_ccbs(ctx, idx, nccbs);
|
|
if (ctx->result.exec.status != DAX_SUBMIT_OK)
|
|
return 0;
|
|
|
|
ctx->result.exec.status = dax_lock_pages(ctx, idx, nccbs,
|
|
&ctx->result.exec.status_data);
|
|
if (ctx->result.exec.status != DAX_SUBMIT_OK)
|
|
return 0;
|
|
|
|
if (dax_debug & DAX_DBG_FLG_BASIC)
|
|
dax_prt_ccbs(ctx->ccb_buf, nccbs);
|
|
|
|
hv_rv = sun4v_ccb_submit(ctx->ccb_buf_ra, count,
|
|
HV_CCB_QUERY_CMD | HV_CCB_VA_SECONDARY, 0,
|
|
&accepted_len, &ctx->result.exec.status_data);
|
|
|
|
switch (hv_rv) {
|
|
case HV_EOK:
|
|
/*
|
|
* Hcall succeeded with no errors but the accepted
|
|
* length may be less than the requested length. The
|
|
* only way the driver can resubmit the remainder is
|
|
* to wait for completion of the submitted CCBs since
|
|
* there is no way to guarantee the ordering semantics
|
|
* required by the client applications. Therefore we
|
|
* let the user library deal with resubmissions.
|
|
*/
|
|
ctx->result.exec.status = DAX_SUBMIT_OK;
|
|
break;
|
|
case HV_EWOULDBLOCK:
|
|
/*
|
|
* This is a transient HV API error. The user library
|
|
* can retry.
|
|
*/
|
|
dax_dbg("hcall returned HV_EWOULDBLOCK");
|
|
ctx->result.exec.status = DAX_SUBMIT_ERR_WOULDBLOCK;
|
|
break;
|
|
case HV_ENOMAP:
|
|
/*
|
|
* HV was unable to translate a VA. The VA it could
|
|
* not translate is returned in the status_data param.
|
|
*/
|
|
dax_dbg("hcall returned HV_ENOMAP");
|
|
ctx->result.exec.status = DAX_SUBMIT_ERR_NOMAP;
|
|
break;
|
|
case HV_EINVAL:
|
|
/*
|
|
* This is the result of an invalid user CCB as HV is
|
|
* validating some of the user CCB fields. Pass this
|
|
* error back to the user. There is no supporting info
|
|
* to isolate the invalid field.
|
|
*/
|
|
dax_dbg("hcall returned HV_EINVAL");
|
|
ctx->result.exec.status = DAX_SUBMIT_ERR_CCB_INVAL;
|
|
break;
|
|
case HV_ENOACCESS:
|
|
/*
|
|
* HV found a VA that did not have the appropriate
|
|
* permissions (such as the w bit). The VA in question
|
|
* is returned in status_data param.
|
|
*/
|
|
dax_dbg("hcall returned HV_ENOACCESS");
|
|
ctx->result.exec.status = DAX_SUBMIT_ERR_NOACCESS;
|
|
break;
|
|
case HV_EUNAVAILABLE:
|
|
/*
|
|
* The requested CCB operation could not be performed
|
|
* at this time. Return the specific unavailable code
|
|
* in the status_data field.
|
|
*/
|
|
dax_dbg("hcall returned HV_EUNAVAILABLE");
|
|
ctx->result.exec.status = DAX_SUBMIT_ERR_UNAVAIL;
|
|
break;
|
|
default:
|
|
ctx->result.exec.status = DAX_SUBMIT_ERR_INTERNAL;
|
|
dax_dbg("unknown hcall return value (%ld)", hv_rv);
|
|
break;
|
|
}
|
|
|
|
/* unlock pages associated with the unaccepted CCBs */
|
|
naccepted = accepted_len / sizeof(struct dax_ccb);
|
|
dax_unlock_pages(ctx, idx + naccepted, nccbs - naccepted);
|
|
|
|
/* mark unaccepted CCBs as not completed */
|
|
for (i = idx + naccepted; i < idx + nccbs; i++)
|
|
ctx->ca_buf[i].status = CCA_STAT_COMPLETED;
|
|
|
|
ctx->ccb_count += naccepted;
|
|
ctx->fail_count += nccbs - naccepted;
|
|
|
|
dax_dbg("hcall rv=%ld, accepted_len=%ld, status_data=0x%llx, ret status=%d",
|
|
hv_rv, accepted_len, ctx->result.exec.status_data,
|
|
ctx->result.exec.status);
|
|
|
|
if (count == accepted_len)
|
|
ctx->client = NULL; /* no read needed to complete protocol */
|
|
return accepted_len;
|
|
}
|