diff options
Diffstat (limited to 'drivers/crypto/ccp/ccp-dev-v5.c')
| -rw-r--r-- | drivers/crypto/ccp/ccp-dev-v5.c | 1017 |
1 files changed, 1017 insertions, 0 deletions
diff --git a/drivers/crypto/ccp/ccp-dev-v5.c b/drivers/crypto/ccp/ccp-dev-v5.c new file mode 100644 index 000000000000..faf3cb3ddce2 --- /dev/null +++ b/drivers/crypto/ccp/ccp-dev-v5.c @@ -0,0 +1,1017 @@ +/* + * AMD Cryptographic Coprocessor (CCP) driver + * + * Copyright (C) 2016 Advanced Micro Devices, Inc. + * + * Author: Gary R Hook <gary.hook@amd.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/pci.h> +#include <linux/kthread.h> +#include <linux/dma-mapping.h> +#include <linux/interrupt.h> +#include <linux/compiler.h> +#include <linux/ccp.h> + +#include "ccp-dev.h" + +static u32 ccp_lsb_alloc(struct ccp_cmd_queue *cmd_q, unsigned int count) +{ + struct ccp_device *ccp; + int start; + + /* First look at the map for the queue */ + if (cmd_q->lsb >= 0) { + start = (u32)bitmap_find_next_zero_area(cmd_q->lsbmap, + LSB_SIZE, + 0, count, 0); + if (start < LSB_SIZE) { + bitmap_set(cmd_q->lsbmap, start, count); + return start + cmd_q->lsb * LSB_SIZE; + } + } + + /* No joy; try to get an entry from the shared blocks */ + ccp = cmd_q->ccp; + for (;;) { + mutex_lock(&ccp->sb_mutex); + + start = (u32)bitmap_find_next_zero_area(ccp->lsbmap, + MAX_LSB_CNT * LSB_SIZE, + 0, + count, 0); + if (start <= MAX_LSB_CNT * LSB_SIZE) { + bitmap_set(ccp->lsbmap, start, count); + + mutex_unlock(&ccp->sb_mutex); + return start * LSB_ITEM_SIZE; + } + + ccp->sb_avail = 0; + + mutex_unlock(&ccp->sb_mutex); + + /* Wait for KSB entries to become available */ + if (wait_event_interruptible(ccp->sb_queue, ccp->sb_avail)) + return 0; + } +} + +static void ccp_lsb_free(struct ccp_cmd_queue *cmd_q, unsigned int start, + unsigned int count) +{ + int lsbno = start / LSB_SIZE; + + if (!start) + return; + + if (cmd_q->lsb == lsbno) { + /* An entry from the private LSB */ + bitmap_clear(cmd_q->lsbmap, start % LSB_SIZE, count); + } else { + /* From the shared LSBs */ + struct ccp_device *ccp = cmd_q->ccp; + + mutex_lock(&ccp->sb_mutex); + bitmap_clear(ccp->lsbmap, start, count); + ccp->sb_avail = 1; + mutex_unlock(&ccp->sb_mutex); + wake_up_interruptible_all(&ccp->sb_queue); + } +} + +/* CCP version 5: Union to define the function field (cmd_reg1/dword0) */ +union ccp_function { + struct { + u16 size:7; + u16 encrypt:1; + u16 mode:5; + u16 type:2; + } aes; + struct { + u16 size:7; + u16 encrypt:1; + u16 rsvd:5; + u16 type:2; + } aes_xts; + struct { + u16 rsvd1:10; + u16 type:4; + u16 rsvd2:1; + } sha; + struct { + u16 mode:3; + u16 size:12; + } rsa; + struct { + u16 byteswap:2; + u16 bitwise:3; + u16 reflect:2; + u16 rsvd:8; + } pt; + struct { + u16 rsvd:13; + } zlib; + struct { + u16 size:10; + u16 type:2; + u16 mode:3; + } ecc; + u16 raw; +}; + +#define CCP_AES_SIZE(p) ((p)->aes.size) +#define CCP_AES_ENCRYPT(p) ((p)->aes.encrypt) +#define CCP_AES_MODE(p) ((p)->aes.mode) +#define CCP_AES_TYPE(p) ((p)->aes.type) +#define CCP_XTS_SIZE(p) ((p)->aes_xts.size) +#define CCP_XTS_ENCRYPT(p) ((p)->aes_xts.encrypt) +#define CCP_SHA_TYPE(p) ((p)->sha.type) +#define CCP_RSA_SIZE(p) ((p)->rsa.size) +#define CCP_PT_BYTESWAP(p) ((p)->pt.byteswap) +#define CCP_PT_BITWISE(p) ((p)->pt.bitwise) +#define CCP_ECC_MODE(p) ((p)->ecc.mode) +#define CCP_ECC_AFFINE(p) ((p)->ecc.one) + +/* Word 0 */ +#define CCP5_CMD_DW0(p) ((p)->dw0) +#define CCP5_CMD_SOC(p) (CCP5_CMD_DW0(p).soc) +#define CCP5_CMD_IOC(p) (CCP5_CMD_DW0(p).ioc) +#define CCP5_CMD_INIT(p) (CCP5_CMD_DW0(p).init) +#define CCP5_CMD_EOM(p) (CCP5_CMD_DW0(p).eom) +#define CCP5_CMD_FUNCTION(p) (CCP5_CMD_DW0(p).function) +#define CCP5_CMD_ENGINE(p) (CCP5_CMD_DW0(p).engine) +#define CCP5_CMD_PROT(p) (CCP5_CMD_DW0(p).prot) + +/* Word 1 */ +#define CCP5_CMD_DW1(p) ((p)->length) +#define CCP5_CMD_LEN(p) (CCP5_CMD_DW1(p)) + +/* Word 2 */ +#define CCP5_CMD_DW2(p) ((p)->src_lo) +#define CCP5_CMD_SRC_LO(p) (CCP5_CMD_DW2(p)) + +/* Word 3 */ +#define CCP5_CMD_DW3(p) ((p)->dw3) +#define CCP5_CMD_SRC_MEM(p) ((p)->dw3.src_mem) +#define CCP5_CMD_SRC_HI(p) ((p)->dw3.src_hi) +#define CCP5_CMD_LSB_ID(p) ((p)->dw3.lsb_cxt_id) +#define CCP5_CMD_FIX_SRC(p) ((p)->dw3.fixed) + +/* Words 4/5 */ +#define CCP5_CMD_DW4(p) ((p)->dw4) +#define CCP5_CMD_DST_LO(p) (CCP5_CMD_DW4(p).dst_lo) +#define CCP5_CMD_DW5(p) ((p)->dw5.fields.dst_hi) +#define CCP5_CMD_DST_HI(p) (CCP5_CMD_DW5(p)) +#define CCP5_CMD_DST_MEM(p) ((p)->dw5.fields.dst_mem) +#define CCP5_CMD_FIX_DST(p) ((p)->dw5.fields.fixed) +#define CCP5_CMD_SHA_LO(p) ((p)->dw4.sha_len_lo) +#define CCP5_CMD_SHA_HI(p) ((p)->dw5.sha_len_hi) + +/* Word 6/7 */ +#define CCP5_CMD_DW6(p) ((p)->key_lo) +#define CCP5_CMD_KEY_LO(p) (CCP5_CMD_DW6(p)) +#define CCP5_CMD_DW7(p) ((p)->dw7) +#define CCP5_CMD_KEY_HI(p) ((p)->dw7.key_hi) +#define CCP5_CMD_KEY_MEM(p) ((p)->dw7.key_mem) + +static inline u32 low_address(unsigned long addr) +{ + return (u64)addr & 0x0ffffffff; +} + +static inline u32 high_address(unsigned long addr) +{ + return ((u64)addr >> 32) & 0x00000ffff; +} + +static unsigned int ccp5_get_free_slots(struct ccp_cmd_queue *cmd_q) +{ + unsigned int head_idx, n; + u32 head_lo, queue_start; + + queue_start = low_address(cmd_q->qdma_tail); + head_lo = ioread32(cmd_q->reg_head_lo); + head_idx = (head_lo - queue_start) / sizeof(struct ccp5_desc); + + n = head_idx + COMMANDS_PER_QUEUE - cmd_q->qidx - 1; + + return n % COMMANDS_PER_QUEUE; /* Always one unused spot */ +} + +static int ccp5_do_cmd(struct ccp5_desc *desc, + struct ccp_cmd_queue *cmd_q) +{ + u32 *mP; + __le32 *dP; + u32 tail; + int i; + int ret = 0; + + if (CCP5_CMD_SOC(desc)) { + CCP5_CMD_IOC(desc) = 1; + CCP5_CMD_SOC(desc) = 0; + } + mutex_lock(&cmd_q->q_mutex); + + mP = (u32 *) &cmd_q->qbase[cmd_q->qidx]; + dP = (__le32 *) desc; + for (i = 0; i < 8; i++) + mP[i] = cpu_to_le32(dP[i]); /* handle endianness */ + + cmd_q->qidx = (cmd_q->qidx + 1) % COMMANDS_PER_QUEUE; + + /* The data used by this command must be flushed to memory */ + wmb(); + + /* Write the new tail address back to the queue register */ + tail = low_address(cmd_q->qdma_tail + cmd_q->qidx * Q_DESC_SIZE); + iowrite32(tail, cmd_q->reg_tail_lo); + + /* Turn the queue back on using our cached control register */ + iowrite32(cmd_q->qcontrol | CMD5_Q_RUN, cmd_q->reg_control); + mutex_unlock(&cmd_q->q_mutex); + + if (CCP5_CMD_IOC(desc)) { + /* Wait for the job to complete */ + ret = wait_event_interruptible(cmd_q->int_queue, + cmd_q->int_rcvd); + if (ret || cmd_q->cmd_error) { + if (cmd_q->cmd_error) + ccp_log_error(cmd_q->ccp, + cmd_q->cmd_error); + /* A version 5 device doesn't use Job IDs... */ + if (!ret) + ret = -EIO; + } + cmd_q->int_rcvd = 0; + } + + return 0; +} + +static int ccp5_perform_aes(struct ccp_op *op) +{ + struct ccp5_desc desc; + union ccp_function function; + u32 key_addr = op->sb_key * LSB_ITEM_SIZE; + + /* Zero out all the fields of the command desc */ + memset(&desc, 0, Q_DESC_SIZE); + + CCP5_CMD_ENGINE(&desc) = CCP_ENGINE_AES; + + CCP5_CMD_SOC(&desc) = op->soc; + CCP5_CMD_IOC(&desc) = 1; + CCP5_CMD_INIT(&desc) = op->init; + CCP5_CMD_EOM(&desc) = op->eom; + CCP5_CMD_PROT(&desc) = 0; + + function.raw = 0; + CCP_AES_ENCRYPT(&function) = op->u.aes.action; + CCP_AES_MODE(&function) = op->u.aes.mode; + CCP_AES_TYPE(&function) = op->u.aes.type; + if (op->u.aes.mode == CCP_AES_MODE_CFB) + CCP_AES_SIZE(&function) = 0x7f; + + CCP5_CMD_FUNCTION(&desc) = function.raw; + + CCP5_CMD_LEN(&desc) = op->src.u.dma.length; + + CCP5_CMD_SRC_LO(&desc) = ccp_addr_lo(&op->src.u.dma); + CCP5_CMD_SRC_HI(&desc) = ccp_addr_hi(&op->src.u.dma); + CCP5_CMD_SRC_MEM(&desc) = CCP_MEMTYPE_SYSTEM; + + CCP5_CMD_DST_LO(&desc) = ccp_addr_lo(&op->dst.u.dma); + CCP5_CMD_DST_HI(&desc) = ccp_addr_hi(&op->dst.u.dma); + CCP5_CMD_DST_MEM(&desc) = CCP_MEMTYPE_SYSTEM; + + CCP5_CMD_KEY_LO(&desc) = lower_32_bits(key_addr); + CCP5_CMD_KEY_HI(&desc) = 0; + CCP5_CMD_KEY_MEM(&desc) = CCP_MEMTYPE_SB; + CCP5_CMD_LSB_ID(&desc) = op->sb_ctx; + + return ccp5_do_cmd(&desc, op->cmd_q); +} + +static int ccp5_perform_xts_aes(struct ccp_op *op) +{ + struct ccp5_desc desc; + union ccp_function function; + u32 key_addr = op->sb_key * LSB_ITEM_SIZE; + + /* Zero out all the fields of the command desc */ + memset(&desc, 0, Q_DESC_SIZE); + + CCP5_CMD_ENGINE(&desc) = CCP_ENGINE_XTS_AES_128; + + CCP5_CMD_SOC(&desc) = op->soc; + CCP5_CMD_IOC(&desc) = 1; + CCP5_CMD_INIT(&desc) = op->init; + CCP5_CMD_EOM(&desc) = op->eom; + CCP5_CMD_PROT(&desc) = 0; + + function.raw = 0; + CCP_XTS_ENCRYPT(&function) = op->u.xts.action; + CCP_XTS_SIZE(&function) = op->u.xts.unit_size; + CCP5_CMD_FUNCTION(&desc) = function.raw; + + CCP5_CMD_LEN(&desc) = op->src.u.dma.length; + + CCP5_CMD_SRC_LO(&desc) = ccp_addr_lo(&op->src.u.dma); + CCP5_CMD_SRC_HI(&desc) = ccp_addr_hi(&op->src.u.dma); + CCP5_CMD_SRC_MEM(&desc) = CCP_MEMTYPE_SYSTEM; + + CCP5_CMD_DST_LO(&desc) = ccp_addr_lo(&op->dst.u.dma); + CCP5_CMD_DST_HI(&desc) = ccp_addr_hi(&op->dst.u.dma); + CCP5_CMD_DST_MEM(&desc) = CCP_MEMTYPE_SYSTEM; + + CCP5_CMD_KEY_LO(&desc) = lower_32_bits(key_addr); + CCP5_CMD_KEY_HI(&desc) = 0; + CCP5_CMD_KEY_MEM(&desc) = CCP_MEMTYPE_SB; + CCP5_CMD_LSB_ID(&desc) = op->sb_ctx; + + return ccp5_do_cmd(&desc, op->cmd_q); +} + +static int ccp5_perform_sha(struct ccp_op *op) +{ + struct ccp5_desc desc; + union ccp_function function; + + /* Zero out all the fields of the command desc */ + memset(&desc, 0, Q_DESC_SIZE); + + CCP5_CMD_ENGINE(&desc) = CCP_ENGINE_SHA; + + CCP5_CMD_SOC(&desc) = op->soc; + CCP5_CMD_IOC(&desc) = 1; + CCP5_CMD_INIT(&desc) = 1; + CCP5_CMD_EOM(&desc) = op->eom; + CCP5_CMD_PROT(&desc) = 0; + + function.raw = 0; + CCP_SHA_TYPE(&function) = op->u.sha.type; + CCP5_CMD_FUNCTION(&desc) = function.raw; + + CCP5_CMD_LEN(&desc) = op->src.u.dma.length; + + CCP5_CMD_SRC_LO(&desc) = ccp_addr_lo(&op->src.u.dma); + CCP5_CMD_SRC_HI(&desc) = ccp_addr_hi(&op->src.u.dma); + CCP5_CMD_SRC_MEM(&desc) = CCP_MEMTYPE_SYSTEM; + + CCP5_CMD_LSB_ID(&desc) = op->sb_ctx; + + if (op->eom) { + CCP5_CMD_SHA_LO(&desc) = lower_32_bits(op->u.sha.msg_bits); + CCP5_CMD_SHA_HI(&desc) = upper_32_bits(op->u.sha.msg_bits); + } else { + CCP5_CMD_SHA_LO(&desc) = 0; + CCP5_CMD_SHA_HI(&desc) = 0; + } + + return ccp5_do_cmd(&desc, op->cmd_q); +} + +static int ccp5_perform_rsa(struct ccp_op *op) +{ + struct ccp5_desc desc; + union ccp_function function; + + /* Zero out all the fields of the command desc */ + memset(&desc, 0, Q_DESC_SIZE); + + CCP5_CMD_ENGINE(&desc) = CCP_ENGINE_RSA; + + CCP5_CMD_SOC(&desc) = op->soc; + CCP5_CMD_IOC(&desc) = 1; + CCP5_CMD_INIT(&desc) = 0; + CCP5_CMD_EOM(&desc) = 1; + CCP5_CMD_PROT(&desc) = 0; + + function.raw = 0; + CCP_RSA_SIZE(&function) = op->u.rsa.mod_size; + CCP5_CMD_FUNCTION(&desc) = function.raw; + + CCP5_CMD_LEN(&desc) = op->u.rsa.input_len; + + /* Source is from external memory */ + CCP5_CMD_SRC_LO(&desc) = ccp_addr_lo(&op->src.u.dma); + CCP5_CMD_SRC_HI(&desc) = ccp_addr_hi(&op->src.u.dma); + CCP5_CMD_SRC_MEM(&desc) = CCP_MEMTYPE_SYSTEM; + + /* Destination is in external memory */ + CCP5_CMD_DST_LO(&desc) = ccp_addr_lo(&op->dst.u.dma); + CCP5_CMD_DST_HI(&desc) = ccp_addr_hi(&op->dst.u.dma); + CCP5_CMD_DST_MEM(&desc) = CCP_MEMTYPE_SYSTEM; + + /* Key (Exponent) is in external memory */ + CCP5_CMD_KEY_LO(&desc) = ccp_addr_lo(&op->exp.u.dma); + CCP5_CMD_KEY_HI(&desc) = ccp_addr_hi(&op->exp.u.dma); + CCP5_CMD_KEY_MEM(&desc) = CCP_MEMTYPE_SYSTEM; + + return ccp5_do_cmd(&desc, op->cmd_q); +} + +static int ccp5_perform_passthru(struct ccp_op *op) +{ + struct ccp5_desc desc; + union ccp_function function; + struct ccp_dma_info *saddr = &op->src.u.dma; + struct ccp_dma_info *daddr = &op->dst.u.dma; + + memset(&desc, 0, Q_DESC_SIZE); + + CCP5_CMD_ENGINE(&desc) = CCP_ENGINE_PASSTHRU; + + CCP5_CMD_SOC(&desc) = 0; + CCP5_CMD_IOC(&desc) = 1; + CCP5_CMD_INIT(&desc) = 0; + CCP5_CMD_EOM(&desc) = op->eom; + CCP5_CMD_PROT(&desc) = 0; + + function.raw = 0; + CCP_PT_BYTESWAP(&function) = op->u.passthru.byte_swap; + CCP_PT_BITWISE(&function) = op->u.passthru.bit_mod; + CCP5_CMD_FUNCTION(&desc) = function.raw; + + /* Length of source data is always 256 bytes */ + if (op->src.type == CCP_MEMTYPE_SYSTEM) + CCP5_CMD_LEN(&desc) = saddr->length; + else + CCP5_CMD_LEN(&desc) = daddr->length; + + if (op->src.type == CCP_MEMTYPE_SYSTEM) { + CCP5_CMD_SRC_LO(&desc) = ccp_addr_lo(&op->src.u.dma); + CCP5_CMD_SRC_HI(&desc) = ccp_addr_hi(&op->src.u.dma); + CCP5_CMD_SRC_MEM(&desc) = CCP_MEMTYPE_SYSTEM; + + if (op->u.passthru.bit_mod != CCP_PASSTHRU_BITWISE_NOOP) + CCP5_CMD_LSB_ID(&desc) = op->sb_key; + } else { + u32 key_addr = op->src.u.sb * CCP_SB_BYTES; + + CCP5_CMD_SRC_LO(&desc) = lower_32_bits(key_addr); + CCP5_CMD_SRC_HI(&desc) = 0; + CCP5_CMD_SRC_MEM(&desc) = CCP_MEMTYPE_SB; + } + + if (op->dst.type == CCP_MEMTYPE_SYSTEM) { + CCP5_CMD_DST_LO(&desc) = ccp_addr_lo(&op->dst.u.dma); + CCP5_CMD_DST_HI(&desc) = ccp_addr_hi(&op->dst.u.dma); + CCP5_CMD_DST_MEM(&desc) = CCP_MEMTYPE_SYSTEM; + } else { + u32 key_addr = op->dst.u.sb * CCP_SB_BYTES; + + CCP5_CMD_DST_LO(&desc) = lower_32_bits(key_addr); + CCP5_CMD_DST_HI(&desc) = 0; + CCP5_CMD_DST_MEM(&desc) = CCP_MEMTYPE_SB; + } + + return ccp5_do_cmd(&desc, op->cmd_q); +} + +static int ccp5_perform_ecc(struct ccp_op *op) +{ + struct ccp5_desc desc; + union ccp_function function; + + /* Zero out all the fields of the command desc */ + memset(&desc, 0, Q_DESC_SIZE); + + CCP5_CMD_ENGINE(&desc) = CCP_ENGINE_ECC; + + CCP5_CMD_SOC(&desc) = 0; + CCP5_CMD_IOC(&desc) = 1; + CCP5_CMD_INIT(&desc) = 0; + CCP5_CMD_EOM(&desc) = 1; + CCP5_CMD_PROT(&desc) = 0; + + function.raw = 0; + function.ecc.mode = op->u.ecc.function; + CCP5_CMD_FUNCTION(&desc) = function.raw; + + CCP5_CMD_LEN(&desc) = op->src.u.dma.length; + + CCP5_CMD_SRC_LO(&desc) = ccp_addr_lo(&op->src.u.dma); + CCP5_CMD_SRC_HI(&desc) = ccp_addr_hi(&op->src.u.dma); + CCP5_CMD_SRC_MEM(&desc) = CCP_MEMTYPE_SYSTEM; + + CCP5_CMD_DST_LO(&desc) = ccp_addr_lo(&op->dst.u.dma); + CCP5_CMD_DST_HI(&desc) = ccp_addr_hi(&op->dst.u.dma); + CCP5_CMD_DST_MEM(&desc) = CCP_MEMTYPE_SYSTEM; + + return ccp5_do_cmd(&desc, op->cmd_q); +} + +static int ccp_find_lsb_regions(struct ccp_cmd_queue *cmd_q, u64 status) +{ + int q_mask = 1 << cmd_q->id; + int queues = 0; + int j; + + /* Build a bit mask to know which LSBs this queue has access to. + * Don't bother with segment 0 as it has special privileges. + */ + for (j = 1; j < MAX_LSB_CNT; j++) { + if (status & q_mask) + bitmap_set(cmd_q->lsbmask, j, 1); + status >>= LSB_REGION_WIDTH; + } + queues = bitmap_weight(cmd_q->lsbmask, MAX_LSB_CNT); + dev_info(cmd_q->ccp->dev, "Queue %d can access %d LSB regions\n", + cmd_q->id, queues); + + return queues ? 0 : -EINVAL; +} + + +static int ccp_find_and_assign_lsb_to_q(struct ccp_device *ccp, + int lsb_cnt, int n_lsbs, + unsigned long *lsb_pub) +{ + DECLARE_BITMAP(qlsb, MAX_LSB_CNT); + int bitno; + int qlsb_wgt; + int i; + + /* For each queue: + * If the count of potential LSBs available to a queue matches the + * ordinal given to us in lsb_cnt: + * Copy the mask of possible LSBs for this queue into "qlsb"; + * For each bit in qlsb, see if the corresponding bit in the + * aggregation mask is set; if so, we have a match. + * If we have a match, clear the bit in the aggregation to + * mark it as no longer available. + * If there is no match, clear the bit in qlsb and keep looking. + */ + for (i = 0; i < ccp->cmd_q_count; i++) { + struct ccp_cmd_queue *cmd_q = &ccp->cmd_q[i]; + + qlsb_wgt = bitmap_weight(cmd_q->lsbmask, MAX_LSB_CNT); + + if (qlsb_wgt == lsb_cnt) { + bitmap_copy(qlsb, cmd_q->lsbmask, MAX_LSB_CNT); + + bitno = find_first_bit(qlsb, MAX_LSB_CNT); + while (bitno < MAX_LSB_CNT) { + if (test_bit(bitno, lsb_pub)) { + /* We found an available LSB + * that this queue can access + */ + cmd_q->lsb = bitno; + bitmap_clear(lsb_pub, bitno, 1); + dev_info(ccp->dev, + "Queue %d gets LSB %d\n", + i, bitno); + break; + } + bitmap_clear(qlsb, bitno, 1); + bitno = find_first_bit(qlsb, MAX_LSB_CNT); + } + if (bitno >= MAX_LSB_CNT) + return -EINVAL; + n_lsbs--; + } + } + return n_lsbs; +} + +/* For each queue, from the most- to least-constrained: + * find an LSB that can be assigned to the queue. If there are N queues that + * can only use M LSBs, where N > M, fail; otherwise, every queue will get a + * dedicated LSB. Remaining LSB regions become a shared resource. + * If we have fewer LSBs than queues, all LSB regions become shared resources. + */ +static int ccp_assign_lsbs(struct ccp_device *ccp) +{ + DECLARE_BITMAP(lsb_pub, MAX_LSB_CNT); + DECLARE_BITMAP(qlsb, MAX_LSB_CNT); + int n_lsbs = 0; + int bitno; + int i, lsb_cnt; + int rc = 0; + + bitmap_zero(lsb_pub, MAX_LSB_CNT); + + /* Create an aggregate bitmap to get a total count of available LSBs */ + for (i = 0; i < ccp->cmd_q_count; i++) + bitmap_or(lsb_pub, + lsb_pub, ccp->cmd_q[i].lsbmask, + MAX_LSB_CNT); + + n_lsbs = bitmap_weight(lsb_pub, MAX_LSB_CNT); + + if (n_lsbs >= ccp->cmd_q_count) { + /* We have enough LSBS to give every queue a private LSB. + * Brute force search to start with the queues that are more + * constrained in LSB choice. When an LSB is privately + * assigned, it is removed from the public mask. + * This is an ugly N squared algorithm with some optimization. + */ + for (lsb_cnt = 1; + n_lsbs && (lsb_cnt <= MAX_LSB_CNT); + lsb_cnt++) { + rc = ccp_find_and_assign_lsb_to_q(ccp, lsb_cnt, n_lsbs, + lsb_pub); + if (rc < 0) + return -EINVAL; + n_lsbs = rc; + } + } + + rc = 0; + /* What's left of the LSBs, according to the public mask, now become + * shared. Any zero bits in the lsb_pub mask represent an LSB region + * that can't be used as a shared resource, so mark the LSB slots for + * them as "in use". + */ + bitmap_copy(qlsb, lsb_pub, MAX_LSB_CNT); + + bitno = find_first_zero_bit(qlsb, MAX_LSB_CNT); + while (bitno < MAX_LSB_CNT) { + bitmap_set(ccp->lsbmap, bitno * LSB_SIZE, LSB_SIZE); + bitmap_set(qlsb, bitno, 1); + bitno = find_first_zero_bit(qlsb, MAX_LSB_CNT); + } + + return rc; +} + +static int ccp5_init(struct ccp_device *ccp) +{ + struct device *dev = ccp->dev; + struct ccp_cmd_queue *cmd_q; + struct dma_pool *dma_pool; + char dma_pool_name[MAX_DMAPOOL_NAME_LEN]; + unsigned int qmr, qim, i; + u64 status; + u32 status_lo, status_hi; + int ret; + + /* Find available queues */ + qim = 0; + qmr = ioread32(ccp->io_regs + Q_MASK_REG); + for (i = 0; i < MAX_HW_QUEUES; i++) { + + if (!(qmr & (1 << i))) + continue; + + /* Allocate a dma pool for this queue */ + snprintf(dma_pool_name, sizeof(dma_pool_name), "%s_q%d", + ccp->name, i); + dma_pool = dma_pool_create(dma_pool_name, dev, + CCP_DMAPOOL_MAX_SIZE, + CCP_DMAPOOL_ALIGN, 0); + if (!dma_pool) { + dev_err(dev, "unable to allocate dma pool\n"); + ret = -ENOMEM; + } + + cmd_q = &ccp->cmd_q[ccp->cmd_q_count]; + ccp->cmd_q_count++; + + cmd_q->ccp = ccp; + cmd_q->id = i; + cmd_q->dma_pool = dma_pool; + mutex_init(&cmd_q->q_mutex); + + /* Page alignment satisfies our needs for N <= 128 */ + BUILD_BUG_ON(COMMANDS_PER_QUEUE > 128); + cmd_q->qsize = Q_SIZE(Q_DESC_SIZE); + cmd_q->qbase = dma_zalloc_coherent(dev, cmd_q->qsize, + &cmd_q->qbase_dma, + GFP_KERNEL); + if (!cmd_q->qbase) { + dev_err(dev, "unable to allocate command queue\n"); + ret = -ENOMEM; + goto e_pool; + } + + cmd_q->qidx = 0; + /* Preset some register values and masks that are queue + * number dependent + */ + cmd_q->reg_control = ccp->io_regs + + CMD5_Q_STATUS_INCR * (i + 1); + cmd_q->reg_tail_lo = cmd_q->reg_control + CMD5_Q_TAIL_LO_BASE; + cmd_q->reg_head_lo = cmd_q->reg_control + CMD5_Q_HEAD_LO_BASE; + cmd_q->reg_int_enable = cmd_q->reg_control + + CMD5_Q_INT_ENABLE_BASE; + cmd_q->reg_interrupt_status = cmd_q->reg_control + + CMD5_Q_INTERRUPT_STATUS_BASE; + cmd_q->reg_status = cmd_q->reg_control + CMD5_Q_STATUS_BASE; + cmd_q->reg_int_status = cmd_q->reg_control + + CMD5_Q_INT_STATUS_BASE; + cmd_q->reg_dma_status = cmd_q->reg_control + + CMD5_Q_DMA_STATUS_BASE; + cmd_q->reg_dma_read_status = cmd_q->reg_control + + CMD5_Q_DMA_READ_STATUS_BASE; + cmd_q->reg_dma_write_status = cmd_q->reg_control + + CMD5_Q_DMA_WRITE_STATUS_BASE; + + init_waitqueue_head(&cmd_q->int_queue); + + dev_dbg(dev, "queue #%u available\n", i); + } + if (ccp->cmd_q_count == 0) { + dev_notice(dev, "no command queues available\n"); + ret = -EIO; + goto e_pool; + } + dev_notice(dev, "%u command queues available\n", ccp->cmd_q_count); + + /* Turn off the queues and disable interrupts until ready */ + for (i = 0; i < ccp->cmd_q_count; i++) { + cmd_q = &ccp->cmd_q[i]; + + cmd_q->qcontrol = 0; /* Start with nothing */ + iowrite32(cmd_q->qcontrol, cmd_q->reg_control); + + /* Disable the interrupts */ + iowrite32(0x00, cmd_q->reg_int_enable); + ioread32(cmd_q->reg_int_status); + ioread32(cmd_q->reg_status); + + /* Clear the interrupts */ + iowrite32(ALL_INTERRUPTS, cmd_q->reg_interrupt_status); + } + + dev_dbg(dev, "Requesting an IRQ...\n"); + /* Request an irq */ + ret = ccp->get_irq(ccp); + if (ret) { + dev_err(dev, "unable to allocate an IRQ\n"); + goto e_pool; + } + + /* Initialize the queue used to suspend */ + init_waitqueue_head(&ccp->suspend_queue); + + dev_dbg(dev, "Loading LSB map...\n"); + /* Copy the private LSB mask to the public registers */ + status_lo = ioread32(ccp->io_regs + LSB_PRIVATE_MASK_LO_OFFSET); + status_hi = ioread32(ccp->io_regs + LSB_PRIVATE_MASK_HI_OFFSET); + iowrite32(status_lo, ccp->io_regs + LSB_PUBLIC_MASK_LO_OFFSET); + iowrite32(status_hi, ccp->io_regs + LSB_PUBLIC_MASK_HI_OFFSET); + status = ((u64)status_hi<<30) | (u64)status_lo; + + dev_dbg(dev, "Configuring virtual queues...\n"); + /* Configure size of each virtual queue accessible to host */ + for (i = 0; i < ccp->cmd_q_count; i++) { + u32 dma_addr_lo; + u32 dma_addr_hi; + + cmd_q = &ccp->cmd_q[i]; + + cmd_q->qcontrol &= ~(CMD5_Q_SIZE << CMD5_Q_SHIFT); + cmd_q->qcontrol |= QUEUE_SIZE_VAL << CMD5_Q_SHIFT; + + cmd_q->qdma_tail = cmd_q->qbase_dma; + dma_addr_lo = low_address(cmd_q->qdma_tail); + iowrite32((u32)dma_addr_lo, cmd_q->reg_tail_lo); + iowrite32((u32)dma_addr_lo, cmd_q->reg_head_lo); + + dma_addr_hi = high_address(cmd_q->qdma_tail); + cmd_q->qcontrol |= (dma_addr_hi << 16); + iowrite32(cmd_q->qcontrol, cmd_q->reg_control); + + /* Find the LSB regions accessible to the queue */ + ccp_find_lsb_regions(cmd_q, status); + cmd_q->lsb = -1; /* Unassigned value */ + } + + dev_dbg(dev, "Assigning LSBs...\n"); + ret = ccp_assign_lsbs(ccp); + if (ret) { + dev_err(dev, "Unable to assign LSBs (%d)\n", ret); + goto e_irq; + } + + /* Optimization: pre-allocate LSB slots for each queue */ + for (i = 0; i < ccp->cmd_q_count; i++) { + ccp->cmd_q[i].sb_key = ccp_lsb_alloc(&ccp->cmd_q[i], 2); + ccp->cmd_q[i].sb_ctx = ccp_lsb_alloc(&ccp->cmd_q[i], 2); + } + + dev_dbg(dev, "Starting threads...\n"); + /* Create a kthread for each queue */ + for (i = 0; i < ccp->cmd_q_count; i++) { + struct task_struct *kthread; + + cmd_q = &ccp->cmd_q[i]; + + kthread = kthread_create(ccp_cmd_queue_thread, cmd_q, + "%s-q%u", ccp->name, cmd_q->id); + if (IS_ERR(kthread)) { + dev_err(dev, "error creating queue thread (%ld)\n", + PTR_ERR(kthread)); + ret = PTR_ERR(kthread); + goto e_kthread; + } + + cmd_q->kthread = kthread; + wake_up_process(kthread); + } + + dev_dbg(dev, "Enabling interrupts...\n"); + /* Enable interrupts */ + for (i = 0; i < ccp->cmd_q_count; i++) { + cmd_q = &ccp->cmd_q[i]; + iowrite32(ALL_INTERRUPTS, cmd_q->reg_int_enable); + } + + dev_dbg(dev, "Registering device...\n"); + /* Put this on the unit list to make it available */ + ccp_add_device(ccp); + + ret = ccp_register_rng(ccp); + if (ret) + goto e_kthread; + + /* Register the DMA engine support */ + ret = ccp_dmaengine_register(ccp); + if (ret) + goto e_hwrng; + + return 0; + +e_hwrng: + ccp_unregister_rng(ccp); + +e_kthread: + for (i = 0; i < ccp->cmd_q_count; i++) + if (ccp->cmd_q[i].kthread) + kthread_stop(ccp->cmd_q[i].kthread); + +e_irq: + ccp->free_irq(ccp); + +e_pool: + for (i = 0; i < ccp->cmd_q_count; i++) + dma_pool_destroy(ccp->cmd_q[i].dma_pool); + + return ret; +} + +static void ccp5_destroy(struct ccp_device *ccp) +{ + struct device *dev = ccp->dev; + struct ccp_cmd_queue *cmd_q; + struct ccp_cmd *cmd; + unsigned int i; + + /* Unregister the DMA engine */ + ccp_dmaengine_unregister(ccp); + + /* Unregister the RNG */ + ccp_unregister_rng(ccp); + + /* Remove this device from the list of available units first */ + ccp_del_device(ccp); + + /* Disable and clear interrupts */ + for (i = 0; i < ccp->cmd_q_count; i++) { + cmd_q = &ccp->cmd_q[i]; + + /* Turn off the run bit */ + iowrite32(cmd_q->qcontrol & ~CMD5_Q_RUN, cmd_q->reg_control); + + /* Disable the interrupts */ + iowrite32(ALL_INTERRUPTS, cmd_q->reg_interrupt_status); + + /* Clear the interrupt status */ + iowrite32(0x00, cmd_q->reg_int_enable); + ioread32(cmd_q->reg_int_status); + ioread32(cmd_q->reg_status); + } + + /* Stop the queue kthreads */ + for (i = 0; i < ccp->cmd_q_count; i++) + if (ccp->cmd_q[i].kthread) + kthread_stop(ccp->cmd_q[i].kthread); + + ccp->free_irq(ccp); + + for (i = 0; i < ccp->cmd_q_count; i++) { + cmd_q = &ccp->cmd_q[i]; + dma_free_coherent(dev, cmd_q->qsize, cmd_q->qbase, + cmd_q->qbase_dma); + } + + /* Flush the cmd and backlog queue */ + while (!list_empty(&ccp->cmd)) { + /* Invoke the callback directly with an error code */ + cmd = list_first_entry(&ccp->cmd, struct ccp_cmd, entry); + list_del(&cmd->entry); + cmd->callback(cmd->data, -ENODEV); + } + while (!list_empty(&ccp->backlog)) { + /* Invoke the callback directly with an error code */ + cmd = list_first_entry(&ccp->backlog, struct ccp_cmd, entry); + list_del(&cmd->entry); + cmd->callback(cmd->data, -ENODEV); + } +} + +static irqreturn_t ccp5_irq_handler(int irq, void *data) +{ + struct device *dev = data; + struct ccp_device *ccp = dev_get_drvdata(dev); + u32 status; + unsigned int i; + + for (i = 0; i < ccp->cmd_q_count; i++) { + struct ccp_cmd_queue *cmd_q = &ccp->cmd_q[i]; + + status = ioread32(cmd_q->reg_interrupt_status); + + if (status) { + cmd_q->int_status = status; + cmd_q->q_status = ioread32(cmd_q->reg_status); + cmd_q->q_int_status = ioread32(cmd_q->reg_int_status); + + /* On error, only save the first error value */ + if ((status & INT_ERROR) && !cmd_q->cmd_error) + cmd_q->cmd_error = CMD_Q_ERROR(cmd_q->q_status); + + cmd_q->int_rcvd = 1; + + /* Acknowledge the interrupt and wake the kthread */ + iowrite32(ALL_INTERRUPTS, cmd_q->reg_interrupt_status); + wake_up_interruptible(&cmd_q->int_queue); + } + } + + return IRQ_HANDLED; +} + +static void ccp5_config(struct ccp_device *ccp) +{ + /* Public side */ + iowrite32(0x00001249, ccp->io_regs + CMD5_REQID_CONFIG_OFFSET); +} + +static void ccp5other_config(struct ccp_device *ccp) +{ + int i; + u32 rnd; + + /* We own all of the queues on the NTB CCP */ + + iowrite32(0x00012D57, ccp->io_regs + CMD5_TRNG_CTL_OFFSET); + iowrite32(0x00000003, ccp->io_regs + CMD5_CONFIG_0_OFFSET); + for (i = 0; i < 12; i++) { + rnd = ioread32(ccp->io_regs + TRNG_OUT_REG); + iowrite32(rnd, ccp->io_regs + CMD5_AES_MASK_OFFSET); + } + + iowrite32(0x0000001F, ccp->io_regs + CMD5_QUEUE_MASK_OFFSET); + iowrite32(0x00005B6D, ccp->io_regs + CMD5_QUEUE_PRIO_OFFSET); + iowrite32(0x00000000, ccp->io_regs + CMD5_CMD_TIMEOUT_OFFSET); + + iowrite32(0x3FFFFFFF, ccp->io_regs + LSB_PRIVATE_MASK_LO_OFFSET); + iowrite32(0x000003FF, ccp->io_regs + LSB_PRIVATE_MASK_HI_OFFSET); + + iowrite32(0x00108823, ccp->io_regs + CMD5_CLK_GATE_CTL_OFFSET); + + ccp5_config(ccp); +} + +/* Version 5 adds some function, but is essentially the same as v5 */ +static const struct ccp_actions ccp5_actions = { + .aes = ccp5_perform_aes, + .xts_aes = ccp5_perform_xts_aes, + .sha = ccp5_perform_sha, + .rsa = ccp5_perform_rsa, + .passthru = ccp5_perform_passthru, + .ecc = ccp5_perform_ecc, + .sballoc = ccp_lsb_alloc, + .sbfree = ccp_lsb_free, + .init = ccp5_init, + .destroy = ccp5_destroy, + .get_free_slots = ccp5_get_free_slots, + .irqhandler = ccp5_irq_handler, +}; + +const struct ccp_vdata ccpv5a = { + .version = CCP_VERSION(5, 0), + .setup = ccp5_config, + .perform = &ccp5_actions, + .bar = 2, + .offset = 0x0, +}; + +const struct ccp_vdata ccpv5b = { + .version = CCP_VERSION(5, 0), + .setup = ccp5other_config, + .perform = &ccp5_actions, + .bar = 2, + .offset = 0x0, +}; |