| Message ID | 20240904145256.3670679-8-avri.altman@wdc.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Add SDUC Support | expand |
On 4/09/24 17:52, Avri Altman wrote: > ACMD22 is used to verify the previously write operation. Normally, it > returns the number of written sectors as u32. SDUC, however, returns it > as u64. This is not a superfluous requirement, because SDUC writes may > exceeds 2TB. For Linux mmc however, the previously write operation > could not be more than the block layer limits, thus we make room for a > u64 and cast the returning value to u32. > > Signed-off-by: Avri Altman <avri.altman@wdc.com> > --- > drivers/mmc/core/block.c | 29 +++++++++++++++++++++++------ > 1 file changed, 23 insertions(+), 6 deletions(-) > > diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c > index 50d37c4f5a50..f36611512a1d 100644 > --- a/drivers/mmc/core/block.c > +++ b/drivers/mmc/core/block.c > @@ -50,6 +50,7 @@ > #include <linux/mmc/sd.h> > > #include <linux/uaccess.h> > +#include <asm/unaligned.h> > > #include "queue.h" > #include "block.h" > @@ -994,11 +995,10 @@ static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 *written_blocks) > int err; > u32 result; > __be32 *blocks; > - > + u8 resp_sz; Could do the initialization here i.e. u8 resp_sz = mmc_card_ult_capacity(card) ? 8 : 4; > struct mmc_request mrq = {}; > struct mmc_command cmd = {}; > struct mmc_data data = {}; > - > struct scatterlist sg; > > err = mmc_app_cmd(card->host, card); > @@ -1009,7 +1009,14 @@ static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 *written_blocks) > cmd.arg = 0; > cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; > > - data.blksz = 4; > + /* > + * Normally, ACMD22 returns the number of written sectors as u32. > + * SDUC, however, returns it as u64. This is not a superfluous > + * requirement, because SDUC writes may exceed 2TB. > + */ > + resp_sz = mmc_card_ult_capacity(card) ? 8 : 4; > + > + data.blksz = resp_sz; > data.blocks = 1; > data.flags = MMC_DATA_READ; > data.sg = &sg; > @@ -1019,15 +1026,25 @@ static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 *written_blocks) > mrq.cmd = &cmd; > mrq.data = &data; > > - blocks = kmalloc(4, GFP_KERNEL); > + blocks = kmalloc(resp_sz, GFP_KERNEL); Separate issue, but this should probably be GFP_NOIO, or just have the buffer in mmc_host or mmc_card > if (!blocks) > return -ENOMEM; > > - sg_init_one(&sg, blocks, 4); > + sg_init_one(&sg, blocks, resp_sz); > > mmc_wait_for_req(card->host, &mrq); > > - result = ntohl(*blocks); > + if (mmc_card_ult_capacity(card)) { > + u64 blocks_64 = get_unaligned_be64(blocks); > + /* > + * For Linux mmc however, the previously write operation could > + * not be more than the block layer limits, thus just make room > + * for a u64 and cast the response back to u32. > + */ > + result = blocks_64 > UINT_MAX ? UINT_MAX : (u32)blocks_64; Perhaps: result = clamp_val(get_unaligned_be64(blocks), 0, UINT_MAX); > + } else { > + result = ntohl(*blocks); > + } > kfree(blocks); > > if (cmd.error || data.error)
> On 4/09/24 17:52, Avri Altman wrote: > > ACMD22 is used to verify the previously write operation. Normally, it > > returns the number of written sectors as u32. SDUC, however, returns > > it as u64. This is not a superfluous requirement, because SDUC writes > > may exceeds 2TB. For Linux mmc however, the previously write > > operation could not be more than the block layer limits, thus we make > > room for a > > u64 and cast the returning value to u32. > > > > Signed-off-by: Avri Altman <avri.altman@wdc.com> > > --- > > drivers/mmc/core/block.c | 29 +++++++++++++++++++++++------ > > 1 file changed, 23 insertions(+), 6 deletions(-) > > > > diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c index > > 50d37c4f5a50..f36611512a1d 100644 > > --- a/drivers/mmc/core/block.c > > +++ b/drivers/mmc/core/block.c > > @@ -50,6 +50,7 @@ > > #include <linux/mmc/sd.h> > > > > #include <linux/uaccess.h> > > +#include <asm/unaligned.h> > > > > #include "queue.h" > > #include "block.h" > > @@ -994,11 +995,10 @@ static int mmc_sd_num_wr_blocks(struct mmc_card > *card, u32 *written_blocks) > > int err; > > u32 result; > > __be32 *blocks; > > - > > + u8 resp_sz; > > Could do the initialization here i.e. > > u8 resp_sz = mmc_card_ult_capacity(card) ? 8 : 4; Done. > > > struct mmc_request mrq = {}; > > struct mmc_command cmd = {}; > > struct mmc_data data = {}; > > - > > struct scatterlist sg; > > > > err = mmc_app_cmd(card->host, card); @@ -1009,7 +1009,14 @@ > > static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 > *written_blocks) > > cmd.arg = 0; > > cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; > > > > - data.blksz = 4; > > + /* > > + * Normally, ACMD22 returns the number of written sectors as u32. > > + * SDUC, however, returns it as u64. This is not a superfluous > > + * requirement, because SDUC writes may exceed 2TB. > > + */ > > + resp_sz = mmc_card_ult_capacity(card) ? 8 : 4; > > + > > + data.blksz = resp_sz; > > data.blocks = 1; > > data.flags = MMC_DATA_READ; > > data.sg = &sg; > > @@ -1019,15 +1026,25 @@ static int mmc_sd_num_wr_blocks(struct > mmc_card *card, u32 *written_blocks) > > mrq.cmd = &cmd; > > mrq.data = &data; > > > > - blocks = kmalloc(4, GFP_KERNEL); > > + blocks = kmalloc(resp_sz, GFP_KERNEL); > > Separate issue, but this should probably be GFP_NOIO, or just have the buffer in > mmc_host or mmc_card OK. Mark this to be fixed in a subsequent patch. > > > if (!blocks) > > return -ENOMEM; > > > > - sg_init_one(&sg, blocks, 4); > > + sg_init_one(&sg, blocks, resp_sz); > > > > mmc_wait_for_req(card->host, &mrq); > > > > - result = ntohl(*blocks); > > + if (mmc_card_ult_capacity(card)) { > > + u64 blocks_64 = get_unaligned_be64(blocks); > > + /* > > + * For Linux mmc however, the previously write operation could > > + * not be more than the block layer limits, thus just make room > > + * for a u64 and cast the response back to u32. > > + */ > > + result = blocks_64 > UINT_MAX ? UINT_MAX : > > + (u32)blocks_64; > > Perhaps: > result = clamp_val(get_unaligned_be64(blocks), 0, UINT_MAX); Done. Thanks, Avri > > > + } else { > > + result = ntohl(*blocks); > > + } > > kfree(blocks); > > > > if (cmd.error || data.error)
diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c index 50d37c4f5a50..f36611512a1d 100644 --- a/drivers/mmc/core/block.c +++ b/drivers/mmc/core/block.c @@ -50,6 +50,7 @@ #include <linux/mmc/sd.h> #include <linux/uaccess.h> +#include <asm/unaligned.h> #include "queue.h" #include "block.h" @@ -994,11 +995,10 @@ static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 *written_blocks) int err; u32 result; __be32 *blocks; - + u8 resp_sz; struct mmc_request mrq = {}; struct mmc_command cmd = {}; struct mmc_data data = {}; - struct scatterlist sg; err = mmc_app_cmd(card->host, card); @@ -1009,7 +1009,14 @@ static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 *written_blocks) cmd.arg = 0; cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; - data.blksz = 4; + /* + * Normally, ACMD22 returns the number of written sectors as u32. + * SDUC, however, returns it as u64. This is not a superfluous + * requirement, because SDUC writes may exceed 2TB. + */ + resp_sz = mmc_card_ult_capacity(card) ? 8 : 4; + + data.blksz = resp_sz; data.blocks = 1; data.flags = MMC_DATA_READ; data.sg = &sg; @@ -1019,15 +1026,25 @@ static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 *written_blocks) mrq.cmd = &cmd; mrq.data = &data; - blocks = kmalloc(4, GFP_KERNEL); + blocks = kmalloc(resp_sz, GFP_KERNEL); if (!blocks) return -ENOMEM; - sg_init_one(&sg, blocks, 4); + sg_init_one(&sg, blocks, resp_sz); mmc_wait_for_req(card->host, &mrq); - result = ntohl(*blocks); + if (mmc_card_ult_capacity(card)) { + u64 blocks_64 = get_unaligned_be64(blocks); + /* + * For Linux mmc however, the previously write operation could + * not be more than the block layer limits, thus just make room + * for a u64 and cast the response back to u32. + */ + result = blocks_64 > UINT_MAX ? UINT_MAX : (u32)blocks_64; + } else { + result = ntohl(*blocks); + } kfree(blocks); if (cmd.error || data.error)
ACMD22 is used to verify the previously write operation. Normally, it returns the number of written sectors as u32. SDUC, however, returns it as u64. This is not a superfluous requirement, because SDUC writes may exceeds 2TB. For Linux mmc however, the previously write operation could not be more than the block layer limits, thus we make room for a u64 and cast the returning value to u32. Signed-off-by: Avri Altman <avri.altman@wdc.com> --- drivers/mmc/core/block.c | 29 +++++++++++++++++++++++------ 1 file changed, 23 insertions(+), 6 deletions(-)