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Subject[PATCH v2 40/46] mtd: nandsim: Expose BBT, delays, etc.. to userspace
Date
From: Richard Weinberger <richard@nod.at>

Allow userspace to define nandsim parameters like
delays, bitflips, ...

Signed-off-by: Richard Weinberger <richard@nod.at>
---
drivers/mtd/nand/nandsim.c | 43 ++++++++++++++++++++++++++++++++++++-------
include/linux/mtd/nandsim.h | 2 +-
2 files changed, 37 insertions(+), 8 deletions(-)

diff --git a/drivers/mtd/nand/nandsim.c b/drivers/mtd/nand/nandsim.c
index 92f5efc..d1402df 100644
--- a/drivers/mtd/nand/nandsim.c
+++ b/drivers/mtd/nand/nandsim.c
@@ -2593,11 +2593,37 @@ static int ns_ctrl_new_instance(struct ns_new_instance_req *req)
nsparam->bus_width = req->bus_width;
nsparam->file_fd = req->file_fd;
nsparam->no_oob = !!req->no_oob;
-
- if (req->parts_num > NANDSIM_MAX_PARTS || req->parts_num < 0) {
- kfree(nsparam);
- return -EINVAL;
- }
+ nsparam->bbt = req->bbt_mode;
+ nsparam->bch = req->bch_strength;
+ nsparam->bitflips = req->bitflips;
+ nsparam->overridesize = req->overridesize;
+
+ if (req->bch_strength && req->no_oob)
+ goto err_inval;
+
+ if (req->access_delay && req->program_delay && req->erase_delay &&
+ req->output_cycle && req->input_cycle) {
+ if (req->access_delay > MAX_UDELAY_MS * 1000)
+ goto err_inval;
+ if (req->program_delay > MAX_UDELAY_MS * 1000)
+ goto err_inval;
+ if (req->erase_delay > 1000)
+ goto err_inval;
+ if (req->output_cycle > MAX_UDELAY_MS * 1000)
+ goto err_inval;
+ if (req->input_cycle > MAX_UDELAY_MS * 1000)
+ goto err_inval;
+
+ nsparam->access_delay = req->access_delay;
+ nsparam->program_delay = req->program_delay;
+ nsparam->erase_delay = req->erase_delay;
+ nsparam->output_cycle = req->output_cycle;
+ nsparam->input_cycle = req->input_cycle;
+ nsparam->do_delays = true;
+ }
+
+ if (req->parts_num > NANDSIM_MAX_PARTS || req->parts_num < 0)
+ goto err_inval;

if (req->parts_num > 0) {
nsparam->parts_num = req->parts_num;
@@ -2618,8 +2644,7 @@ static int ns_ctrl_new_instance(struct ns_new_instance_req *req)
break;

default:
- kfree(nsparam);
- return -EINVAL;
+ goto err_inval;
}

nsmtd = ns_new_instance(nsparam);
@@ -2632,6 +2657,10 @@ static int ns_ctrl_new_instance(struct ns_new_instance_req *req)
ns = nand_get_controller_data(chip);

return ns->index;
+
+err_inval:
+ kfree(nsparam);
+ return -EINVAL;
}

static int ns_ctrl_destroy_instance(struct ns_destroy_instance_req *req)
diff --git a/include/linux/mtd/nandsim.h b/include/linux/mtd/nandsim.h
index 07d32a9..880c0b1 100644
--- a/include/linux/mtd/nandsim.h
+++ b/include/linux/mtd/nandsim.h
@@ -11,7 +11,7 @@ struct nandsim_params {
unsigned int output_cycle;
unsigned int input_cycle;
unsigned int bus_width;
- unsigned int do_delays;
+ bool do_delays;
unsigned int parts[NANDSIM_MAX_PARTS];
unsigned int parts_num;
char *badblocks;
--
2.8.3
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