[PATCH v2] mtd: rawnand: meson: check buffer length
Arseniy Krasnov
avkrasnov at sberdevices.ru
Wed Jun 7 14:17:35 PDT 2023
Hi again Miquel, Liang!
What do You think about this patch?
Thanks, Arseniy
On 06.06.2023 19:29, Arseniy Krasnov wrote:
> Sorry, here is changelog:
> v1 -> v2:
> * Move checks from 'switch/case' which executes commands in 'meson_nfc_exec_op()' to a special
> separated function 'meson_nfc_check_op()' which is called before commands processing.
>
> On 06.06.2023 13:16, Arseniy Krasnov wrote:
>> Meson NAND controller has limited buffer length, so check it before
>> command execution to avoid length trim. Also check MTD write size on
>> chip attach.
>>
>> Signed-off-by: Arseniy Krasnov <AVKrasnov at sberdevices.ru>
>> ---
>> drivers/mtd/nand/raw/meson_nand.c | 47 +++++++++++++++++++++++++++----
>> 1 file changed, 42 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd/nand/raw/meson_nand.c
>> index 23a73268421b..db6b18753071 100644
>> --- a/drivers/mtd/nand/raw/meson_nand.c
>> +++ b/drivers/mtd/nand/raw/meson_nand.c
>> @@ -111,6 +111,8 @@
>>
>> #define PER_INFO_BYTE 8
>>
>> +#define NFC_CMD_RAW_LEN GENMASK(13, 0)
>> +
>> struct meson_nfc_nand_chip {
>> struct list_head node;
>> struct nand_chip nand;
>> @@ -284,7 +286,7 @@ static void meson_nfc_cmd_access(struct nand_chip *nand, int raw, bool dir,
>>
>> if (raw) {
>> len = mtd->writesize + mtd->oobsize;
>> - cmd = (len & GENMASK(13, 0)) | scrambler | DMA_DIR(dir);
>> + cmd = len | scrambler | DMA_DIR(dir);
>> writel(cmd, nfc->reg_base + NFC_REG_CMD);
>> return;
>> }
>> @@ -573,7 +575,7 @@ static int meson_nfc_read_buf(struct nand_chip *nand, u8 *buf, int len)
>> if (ret)
>> goto out;
>>
>> - cmd = NFC_CMD_N2M | (len & GENMASK(13, 0));
>> + cmd = NFC_CMD_N2M | len;
>> writel(cmd, nfc->reg_base + NFC_REG_CMD);
>>
>> meson_nfc_drain_cmd(nfc);
>> @@ -597,7 +599,7 @@ static int meson_nfc_write_buf(struct nand_chip *nand, u8 *buf, int len)
>> if (ret)
>> return ret;
>>
>> - cmd = NFC_CMD_M2N | (len & GENMASK(13, 0));
>> + cmd = NFC_CMD_M2N | len;
>> writel(cmd, nfc->reg_base + NFC_REG_CMD);
>>
>> meson_nfc_drain_cmd(nfc);
>> @@ -1007,6 +1009,31 @@ meson_nand_op_put_dma_safe_output_buf(const struct nand_op_instr *instr,
>> kfree(buf);
>> }
>>
>> +static int meson_nfc_check_op(struct nand_chip *chip,
>> + const struct nand_operation *op)
>> +{
>> + int op_id;
>> +
>> + for (op_id = 0; op_id < op->ninstrs; op_id++) {
>> + const struct nand_op_instr *instr;
>> +
>> + instr = &op->instrs[op_id];
>> +
>> + switch (instr->type) {
>> + case NAND_OP_DATA_IN_INSTR:
>> + case NAND_OP_DATA_OUT_INSTR:
>> + if (instr->ctx.data.len > NFC_CMD_RAW_LEN)
>> + return -ENOTSUPP;
>> +
>> + break;
>> + default:
>> + break;
>> + }
>> + }
>> +
>> + return 0;
>> +}
>> +
>> static int meson_nfc_exec_op(struct nand_chip *nand,
>> const struct nand_operation *op, bool check_only)
>> {
>> @@ -1015,10 +1042,12 @@ static int meson_nfc_exec_op(struct nand_chip *nand,
>> const struct nand_op_instr *instr = NULL;
>> void *buf;
>> u32 op_id, delay_idle, cmd;
>> + int err;
>> int i;
>>
>> - if (check_only)
>> - return 0;
>> + err = meson_nfc_check_op(nand, op);
>> + if (err || check_only)
>> + return err;
>>
>> meson_nfc_select_chip(nand, op->cs);
>> for (op_id = 0; op_id < op->ninstrs; op_id++) {
>> @@ -1293,6 +1322,7 @@ static int meson_nand_attach_chip(struct nand_chip *nand)
>> struct meson_nfc_nand_chip *meson_chip = to_meson_nand(nand);
>> struct mtd_info *mtd = nand_to_mtd(nand);
>> int nsectors = mtd->writesize / 1024;
>> + int raw_writesize;
>> int ret;
>>
>> if (!mtd->name) {
>> @@ -1304,6 +1334,13 @@ static int meson_nand_attach_chip(struct nand_chip *nand)
>> return -ENOMEM;
>> }
>>
>> + raw_writesize = mtd->writesize + mtd->oobsize;
>> + if (raw_writesize > NFC_CMD_RAW_LEN) {
>> + dev_err(nfc->dev, "too big write size in raw mode: %d > %ld\n",
>> + raw_writesize, NFC_CMD_RAW_LEN);
>> + return -EINVAL;
>> + }
>> +
>> if (nand->bbt_options & NAND_BBT_USE_FLASH)
>> nand->bbt_options |= NAND_BBT_NO_OOB;
>>
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