Commit c31ad081 authored by Arve Hjønnevåg's avatar Arve Hjønnevåg Committed by Anton Vorontsov
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pstore/ram: Allow specifying ecc parameters in platform data 



Allow specifying ecc parameters in platform data

Signed-off-by: default avatarArve Hjønnevåg <arve@android.com>
[jstultz: Tweaked commit subject & add commit message]
Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
Acked-by: default avatarKees Cook <keescook@chromium.org>
Signed-off-by: default avatarAnton Vorontsov <anton@enomsg.org>
parent 422ca860

fs/pstore/ram.c

+8 −7
Original line number Diff line number Diff line
@@ -83,7 +83,7 @@ struct ramoops_context { 
	size_t console_size;

	size_t ftrace_size;

	int dump_oops;

	int ecc_size;

	struct persistent_ram_ecc_info ecc_info;

	unsigned int max_dump_cnt;

	unsigned int dump_write_cnt;

	unsigned int dump_read_cnt;
@@ -322,7 +322,8 @@ static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt, 
	for (i = 0; i < cxt->max_dump_cnt; i++) {

		size_t sz = cxt->record_size;



		cxt->przs[i] = persistent_ram_new(*paddr, sz, 0, cxt->ecc_size);

		cxt->przs[i] = persistent_ram_new(*paddr, sz, 0,

						  &cxt->ecc_info);

		if (IS_ERR(cxt->przs[i])) {

			err = PTR_ERR(cxt->przs[i]);

			dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n",
@@ -352,7 +353,7 @@ static int ramoops_init_prz(struct device *dev, struct ramoops_context *cxt, 
		return -ENOMEM;

	}



	*prz = persistent_ram_new(*paddr, sz, sig, cxt->ecc_size);

	*prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info);

	if (IS_ERR(*prz)) {

		int err = PTR_ERR(*prz);
@@ -406,7 +407,7 @@ static int ramoops_probe(struct platform_device *pdev) 
	cxt->console_size = pdata->console_size;

	cxt->ftrace_size = pdata->ftrace_size;

	cxt->dump_oops = pdata->dump_oops;

	cxt->ecc_size = pdata->ecc_size;

	cxt->ecc_info = pdata->ecc_info;



	paddr = cxt->phys_addr;
@@ -464,9 +465,9 @@ static int ramoops_probe(struct platform_device *pdev) 
	record_size = pdata->record_size;

	dump_oops = pdata->dump_oops;



	pr_info("attached 0x%lx@0x%llx, ecc: %d\n",

	pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n",

		cxt->size, (unsigned long long)cxt->phys_addr,

		cxt->ecc_size);

		cxt->ecc_info.ecc_size, cxt->ecc_info.block_size);



	return 0;
@@ -538,7 +539,7 @@ static void ramoops_register_dummy(void) 
	 * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC

	 * (using 1 byte for ECC isn't much of use anyway).

	 */

	dummy_data->ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc;

	dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc;



	dummy = platform_device_register_data(NULL, "ramoops", -1,

			dummy_data, sizeof(struct ramoops_platform_data));

fs/pstore/ram_core.c

+34 −30
Original line number Diff line number Diff line
@@ -82,12 +82,12 @@ static void notrace persistent_ram_encode_rs8(struct persistent_ram_zone *prz, 
	uint8_t *data, size_t len, uint8_t *ecc)

{

	int i;

	uint16_t par[prz->ecc_size];

	uint16_t par[prz->ecc_info.ecc_size];



	/* Initialize the parity buffer */

	memset(par, 0, sizeof(par));

	encode_rs8(prz->rs_decoder, data, len, par, 0);

	for (i = 0; i < prz->ecc_size; i++)

	for (i = 0; i < prz->ecc_info.ecc_size; i++)

		ecc[i] = par[i];

}
@@ -95,9 +95,9 @@ static int persistent_ram_decode_rs8(struct persistent_ram_zone *prz, 
	void *data, size_t len, uint8_t *ecc)

{

	int i;

	uint16_t par[prz->ecc_size];

	uint16_t par[prz->ecc_info.ecc_size];



	for (i = 0; i < prz->ecc_size; i++)

	for (i = 0; i < prz->ecc_info.ecc_size; i++)

		par[i] = ecc[i];

	return decode_rs8(prz->rs_decoder, data, par, len,

				NULL, 0, NULL, 0, NULL);
@@ -110,15 +110,15 @@ static void notrace persistent_ram_update_ecc(struct persistent_ram_zone *prz, 
	uint8_t *buffer_end = buffer->data + prz->buffer_size;

	uint8_t *block;

	uint8_t *par;

	int ecc_block_size = prz->ecc_block_size;

	int ecc_size = prz->ecc_size;

	int size = prz->ecc_block_size;

	int ecc_block_size = prz->ecc_info.block_size;

	int ecc_size = prz->ecc_info.ecc_size;

	int size = ecc_block_size;



	if (!prz->ecc_size)

	if (!ecc_size)

		return;



	block = buffer->data + (start & ~(ecc_block_size - 1));

	par = prz->par_buffer + (start / ecc_block_size) * prz->ecc_size;

	par = prz->par_buffer + (start / ecc_block_size) * ecc_size;



	do {

		if (block + ecc_block_size > buffer_end)
@@ -133,7 +133,7 @@ static void persistent_ram_update_header_ecc(struct persistent_ram_zone *prz) 
{

	struct persistent_ram_buffer *buffer = prz->buffer;



	if (!prz->ecc_size)

	if (!prz->ecc_info.ecc_size)

		return;



	persistent_ram_encode_rs8(prz, (uint8_t *)buffer, sizeof(*buffer),
@@ -146,14 +146,14 @@ static void persistent_ram_ecc_old(struct persistent_ram_zone *prz) 
	uint8_t *block;

	uint8_t *par;



	if (!prz->ecc_size)

	if (!prz->ecc_info.ecc_size)

		return;



	block = buffer->data;

	par = prz->par_buffer;

	while (block < buffer->data + buffer_size(prz)) {

		int numerr;

		int size = prz->ecc_block_size;

		int size = prz->ecc_info.block_size;

		if (block + size > buffer->data + prz->buffer_size)

			size = buffer->data + prz->buffer_size - block;

		numerr = persistent_ram_decode_rs8(prz, block, size, par);
@@ -166,45 +166,49 @@ static void persistent_ram_ecc_old(struct persistent_ram_zone *prz) 
				block);

			prz->bad_blocks++;

		}

		block += prz->ecc_block_size;

		par += prz->ecc_size;

		block += prz->ecc_info.block_size;

		par += prz->ecc_info.ecc_size;

	}

}



static int persistent_ram_init_ecc(struct persistent_ram_zone *prz,

				   int ecc_size)

				   struct persistent_ram_ecc_info *ecc_info)

{

	int numerr;

	struct persistent_ram_buffer *buffer = prz->buffer;

	int ecc_blocks;

	size_t ecc_total;

	int ecc_symsize = 8;

	int ecc_poly = 0x11d;



	if (!ecc_size)

	if (!ecc_info || !ecc_info->ecc_size)

		return 0;



	prz->ecc_block_size = 128;

	prz->ecc_size = ecc_size;

	prz->ecc_info.block_size = ecc_info->block_size ?: 128;

	prz->ecc_info.ecc_size = ecc_info->ecc_size ?: 16;

	prz->ecc_info.symsize = ecc_info->symsize ?: 8;

	prz->ecc_info.poly = ecc_info->poly ?: 0x11d;



	ecc_blocks = DIV_ROUND_UP(prz->buffer_size - prz->ecc_size,

				  prz->ecc_block_size + prz->ecc_size);

	ecc_total = (ecc_blocks + 1) * prz->ecc_size;

	ecc_blocks = DIV_ROUND_UP(prz->buffer_size - prz->ecc_info.ecc_size,

				  prz->ecc_info.block_size +

				  prz->ecc_info.ecc_size);

	ecc_total = (ecc_blocks + 1) * prz->ecc_info.ecc_size;

	if (ecc_total >= prz->buffer_size) {

		pr_err("%s: invalid ecc_size %u (total %zu, buffer size %zu)\n",

		       __func__, prz->ecc_size, ecc_total, prz->buffer_size);

		       __func__, prz->ecc_info.ecc_size,

		       ecc_total, prz->buffer_size);

		return -EINVAL;

	}



	prz->buffer_size -= ecc_total;

	prz->par_buffer = buffer->data + prz->buffer_size;

	prz->par_header = prz->par_buffer + ecc_blocks * prz->ecc_size;

	prz->par_header = prz->par_buffer +

			  ecc_blocks * prz->ecc_info.ecc_size;



	/*

	 * first consecutive root is 0

	 * primitive element to generate roots = 1

	 */

	prz->rs_decoder = init_rs(ecc_symsize, ecc_poly, 0, 1, prz->ecc_size);

	prz->rs_decoder = init_rs(prz->ecc_info.symsize, prz->ecc_info.poly,

				  0, 1, prz->ecc_info.ecc_size);

	if (prz->rs_decoder == NULL) {

		pr_info("persistent_ram: init_rs failed\n");

		return -EINVAL;
@@ -392,11 +396,11 @@ static int persistent_ram_buffer_map(phys_addr_t start, phys_addr_t size, 
}



static int persistent_ram_post_init(struct persistent_ram_zone *prz, u32 sig,

				    int ecc_size)

				    struct persistent_ram_ecc_info *ecc_info)

{

	int ret;



	ret = persistent_ram_init_ecc(prz, ecc_size);

	ret = persistent_ram_init_ecc(prz, ecc_info);

	if (ret)

		return ret;
@@ -445,7 +449,7 @@ void persistent_ram_free(struct persistent_ram_zone *prz) 
}



struct persistent_ram_zone *persistent_ram_new(phys_addr_t start, size_t size,

					       u32 sig, int ecc_size)

			u32 sig, struct persistent_ram_ecc_info *ecc_info)

{

	struct persistent_ram_zone *prz;

	int ret = -ENOMEM;
@@ -460,7 +464,7 @@ struct persistent_ram_zone *persistent_ram_new(phys_addr_t start, size_t size, 
	if (ret)

		goto err;



	ret = persistent_ram_post_init(prz, sig, ecc_size);

	ret = persistent_ram_post_init(prz, sig, ecc_info);

	if (ret)

		goto err;

include/linux/pstore_ram.h

+10 −4
Original line number Diff line number Diff line
@@ -26,6 +26,13 @@ 
struct persistent_ram_buffer;

struct rs_control;



struct persistent_ram_ecc_info {

	int block_size;

	int ecc_size;

	int symsize;

	int poly;

};



struct persistent_ram_zone {

	phys_addr_t paddr;

	size_t size;
@@ -39,15 +46,14 @@ struct persistent_ram_zone { 
	struct rs_control *rs_decoder;

	int corrected_bytes;

	int bad_blocks;

	int ecc_block_size;

	int ecc_size;

	struct persistent_ram_ecc_info ecc_info;



	char *old_log;

	size_t old_log_size;

};



struct persistent_ram_zone *persistent_ram_new(phys_addr_t start, size_t size,

					       u32 sig, int ecc_size);

			u32 sig, struct persistent_ram_ecc_info *ecc_info);

void persistent_ram_free(struct persistent_ram_zone *prz);

void persistent_ram_zap(struct persistent_ram_zone *prz);
@@ -74,7 +80,7 @@ struct ramoops_platform_data { 
	unsigned long	console_size;

	unsigned long	ftrace_size;

	int		dump_oops;

	int		ecc_size;

	struct persistent_ram_ecc_info ecc_info;

};



#endif