| Message ID | 20210608153344.3813661-1-narmstrong@baylibre.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [RFC] mmc: meson-gx: use memcpy_to/fromio for dram-access-quirk | expand |
Hi On 08.06.2021 17:33, Neil Armstrong wrote: > It has been reported that usage of memcpy() to/from an iomem mapping is invalid, > and and recent arm64 memcpy update [1] triggers a memory abort when dram-access-quirk > is used on the G12A/G12B platforms. > > This adds a local sg_copy_to_buffer which makes usage of io versions of memcpy > when dram-access-quirk is enabled. > > Fixes: acdc8e71d9bb ("mmc: meson-gx: add dram-access-quirk") > Reported-by: Marek Szyprowski <m.szyprowski@samsung.com> > Suggested-by: Mark Rutland <mark.rutland@arm.com> > Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> > > [1] 285133040e6c ("arm64: Import latest memcpy()/memmove() implementation") > > Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> > --- > Hi Ulf, Marek, Mark, > > I haven't tested the patch yet, but should fix issue reported at [2]. Works fine here and fixed the issue. Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> > Neil > > [2] https://lore.kernel.org/r/acb244ad-0759-5a96-c659-5c23003d3dcd@samsung.com > > drivers/mmc/host/meson-gx-mmc.c | 48 ++++++++++++++++++++++++++++++--- > 1 file changed, 44 insertions(+), 4 deletions(-) > > diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c > index b8b771b643cc..89ff6038092d 100644 > --- a/drivers/mmc/host/meson-gx-mmc.c > +++ b/drivers/mmc/host/meson-gx-mmc.c > @@ -742,6 +742,48 @@ static void meson_mmc_desc_chain_transfer(struct mmc_host *mmc, u32 cmd_cfg) > writel(start, host->regs + SD_EMMC_START); > } > > +/* local sg copy to buffer version with _to/fromio usage for dram_access_quirk */ > +static void meson_mmc_copy_buffer(struct meson_host *host, struct mmc_data *data, > + size_t buflen, bool to_buffer) > +{ > + unsigned int sg_flags = SG_MITER_ATOMIC; > + struct scatterlist *sgl = data->sg; > + unsigned int nents = data->sg_len; > + struct sg_mapping_iter miter; > + void *buf = host->bounce_buf; > + unsigned int offset = 0; > + > + if (to_buffer) > + sg_flags |= SG_MITER_FROM_SG; > + else > + sg_flags |= SG_MITER_TO_SG; > + > + sg_miter_start(&miter, sgl, nents, sg_flags); > + > + while ((offset < buflen) && sg_miter_next(&miter)) { > + unsigned int len; > + > + len = min(miter.length, buflen - offset); > + > + /* When dram_access_quirk, the bounce buffer is a iomem mapping */ > + if (host->dram_access_quirk) { > + if (to_buffer) > + memcpy_toio(buf + offset, miter.addr, len); > + else > + memcpy_fromio(miter.addr, buf + offset, len); > + } else { > + if (to_buffer) > + memcpy(buf + offset, miter.addr, len); > + else > + memcpy(miter.addr, buf + offset, len); > + } > + > + offset += len; > + } > + > + sg_miter_stop(&miter); > +} > + > static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd) > { > struct meson_host *host = mmc_priv(mmc); > @@ -785,8 +827,7 @@ static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd) > if (data->flags & MMC_DATA_WRITE) { > cmd_cfg |= CMD_CFG_DATA_WR; > WARN_ON(xfer_bytes > host->bounce_buf_size); > - sg_copy_to_buffer(data->sg, data->sg_len, > - host->bounce_buf, xfer_bytes); > + meson_mmc_copy_buffer(host, data, xfer_bytes, true); > dma_wmb(); > } > > @@ -955,8 +996,7 @@ static irqreturn_t meson_mmc_irq_thread(int irq, void *dev_id) > if (meson_mmc_bounce_buf_read(data)) { > xfer_bytes = data->blksz * data->blocks; > WARN_ON(xfer_bytes > host->bounce_buf_size); > - sg_copy_from_buffer(data->sg, data->sg_len, > - host->bounce_buf, xfer_bytes); > + meson_mmc_copy_buffer(host, data, xfer_bytes, false); > } > > next_cmd = meson_mmc_get_next_command(cmd); Best regards
Hi, On 08/06/2021 17:50, Marek Szyprowski wrote: > Hi > > On 08.06.2021 17:33, Neil Armstrong wrote: >> It has been reported that usage of memcpy() to/from an iomem mapping is invalid, >> and and recent arm64 memcpy update [1] triggers a memory abort when dram-access-quirk >> is used on the G12A/G12B platforms. >> >> This adds a local sg_copy_to_buffer which makes usage of io versions of memcpy >> when dram-access-quirk is enabled. >> >> Fixes: acdc8e71d9bb ("mmc: meson-gx: add dram-access-quirk") >> Reported-by: Marek Szyprowski <m.szyprowski@samsung.com> >> Suggested-by: Mark Rutland <mark.rutland@arm.com> >> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> >> >> [1] 285133040e6c ("arm64: Import latest memcpy()/memmove() implementation") >> >> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> >> --- >> Hi Ulf, Marek, Mark, >> >> I haven't tested the patch yet, but should fix issue reported at [2]. > > Works fine here and fixed the issue. > > Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> Thanks, I'll need to rework to pass an __iomem pointer to memcpy_to/fromio so sparse doesn't scream anymore. Neil > >> Neil >> >> [2] https://lore.kernel.org/r/acb244ad-0759-5a96-c659-5c23003d3dcd@samsung.com >> >> drivers/mmc/host/meson-gx-mmc.c | 48 ++++++++++++++++++++++++++++++--- >> 1 file changed, 44 insertions(+), 4 deletions(-) >> >> diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c >> index b8b771b643cc..89ff6038092d 100644 >> --- a/drivers/mmc/host/meson-gx-mmc.c >> +++ b/drivers/mmc/host/meson-gx-mmc.c >> @@ -742,6 +742,48 @@ static void meson_mmc_desc_chain_transfer(struct mmc_host *mmc, u32 cmd_cfg) >> writel(start, host->regs + SD_EMMC_START); >> } >> >> +/* local sg copy to buffer version with _to/fromio usage for dram_access_quirk */ >> +static void meson_mmc_copy_buffer(struct meson_host *host, struct mmc_data *data, >> + size_t buflen, bool to_buffer) >> +{ >> + unsigned int sg_flags = SG_MITER_ATOMIC; >> + struct scatterlist *sgl = data->sg; >> + unsigned int nents = data->sg_len; >> + struct sg_mapping_iter miter; >> + void *buf = host->bounce_buf; >> + unsigned int offset = 0; >> + >> + if (to_buffer) >> + sg_flags |= SG_MITER_FROM_SG; >> + else >> + sg_flags |= SG_MITER_TO_SG; >> + >> + sg_miter_start(&miter, sgl, nents, sg_flags); >> + >> + while ((offset < buflen) && sg_miter_next(&miter)) { >> + unsigned int len; >> + >> + len = min(miter.length, buflen - offset); >> + >> + /* When dram_access_quirk, the bounce buffer is a iomem mapping */ >> + if (host->dram_access_quirk) { >> + if (to_buffer) >> + memcpy_toio(buf + offset, miter.addr, len); >> + else >> + memcpy_fromio(miter.addr, buf + offset, len); >> + } else { >> + if (to_buffer) >> + memcpy(buf + offset, miter.addr, len); >> + else >> + memcpy(miter.addr, buf + offset, len); >> + } >> + >> + offset += len; >> + } >> + >> + sg_miter_stop(&miter); >> +} >> + >> static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd) >> { >> struct meson_host *host = mmc_priv(mmc); >> @@ -785,8 +827,7 @@ static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd) >> if (data->flags & MMC_DATA_WRITE) { >> cmd_cfg |= CMD_CFG_DATA_WR; >> WARN_ON(xfer_bytes > host->bounce_buf_size); >> - sg_copy_to_buffer(data->sg, data->sg_len, >> - host->bounce_buf, xfer_bytes); >> + meson_mmc_copy_buffer(host, data, xfer_bytes, true); >> dma_wmb(); >> } >> >> @@ -955,8 +996,7 @@ static irqreturn_t meson_mmc_irq_thread(int irq, void *dev_id) >> if (meson_mmc_bounce_buf_read(data)) { >> xfer_bytes = data->blksz * data->blocks; >> WARN_ON(xfer_bytes > host->bounce_buf_size); >> - sg_copy_from_buffer(data->sg, data->sg_len, >> - host->bounce_buf, xfer_bytes); >> + meson_mmc_copy_buffer(host, data, xfer_bytes, false); >> } >> >> next_cmd = meson_mmc_get_next_command(cmd); > > Best regards >
On 2021-06-09 14:07, Neil Armstrong wrote: > Hi, > > On 08/06/2021 17:50, Marek Szyprowski wrote: >> Hi >> >> On 08.06.2021 17:33, Neil Armstrong wrote: >>> It has been reported that usage of memcpy() to/from an iomem mapping is invalid, >>> and and recent arm64 memcpy update [1] triggers a memory abort when dram-access-quirk >>> is used on the G12A/G12B platforms. >>> >>> This adds a local sg_copy_to_buffer which makes usage of io versions of memcpy >>> when dram-access-quirk is enabled. >>> >>> Fixes: acdc8e71d9bb ("mmc: meson-gx: add dram-access-quirk") >>> Reported-by: Marek Szyprowski <m.szyprowski@samsung.com> >>> Suggested-by: Mark Rutland <mark.rutland@arm.com> >>> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> >>> >>> [1] 285133040e6c ("arm64: Import latest memcpy()/memmove() implementation") >>> >>> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> >>> --- >>> Hi Ulf, Marek, Mark, >>> >>> I haven't tested the patch yet, but should fix issue reported at [2]. >> >> Works fine here and fixed the issue. >> >> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> > > Thanks, I'll need to rework to pass an __iomem pointer to memcpy_to/fromio so sparse doesn't scream anymore. Hmm, might it be worth factoring out general sg_copy_{to,from}_iomem() helpers? From a quick grep I found at least mv_cesa_sg_copy() already doing essentially the same thing as meson_mmc_copy_buffer(). Robin. > > Neil > >> >>> Neil >>> >>> [2] https://lore.kernel.org/r/acb244ad-0759-5a96-c659-5c23003d3dcd@samsung.com >>> >>> drivers/mmc/host/meson-gx-mmc.c | 48 ++++++++++++++++++++++++++++++--- >>> 1 file changed, 44 insertions(+), 4 deletions(-) >>> >>> diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c >>> index b8b771b643cc..89ff6038092d 100644 >>> --- a/drivers/mmc/host/meson-gx-mmc.c >>> +++ b/drivers/mmc/host/meson-gx-mmc.c >>> @@ -742,6 +742,48 @@ static void meson_mmc_desc_chain_transfer(struct mmc_host *mmc, u32 cmd_cfg) >>> writel(start, host->regs + SD_EMMC_START); >>> } >>> >>> +/* local sg copy to buffer version with _to/fromio usage for dram_access_quirk */ >>> +static void meson_mmc_copy_buffer(struct meson_host *host, struct mmc_data *data, >>> + size_t buflen, bool to_buffer) >>> +{ >>> + unsigned int sg_flags = SG_MITER_ATOMIC; >>> + struct scatterlist *sgl = data->sg; >>> + unsigned int nents = data->sg_len; >>> + struct sg_mapping_iter miter; >>> + void *buf = host->bounce_buf; >>> + unsigned int offset = 0; >>> + >>> + if (to_buffer) >>> + sg_flags |= SG_MITER_FROM_SG; >>> + else >>> + sg_flags |= SG_MITER_TO_SG; >>> + >>> + sg_miter_start(&miter, sgl, nents, sg_flags); >>> + >>> + while ((offset < buflen) && sg_miter_next(&miter)) { >>> + unsigned int len; >>> + >>> + len = min(miter.length, buflen - offset); >>> + >>> + /* When dram_access_quirk, the bounce buffer is a iomem mapping */ >>> + if (host->dram_access_quirk) { >>> + if (to_buffer) >>> + memcpy_toio(buf + offset, miter.addr, len); >>> + else >>> + memcpy_fromio(miter.addr, buf + offset, len); >>> + } else { >>> + if (to_buffer) >>> + memcpy(buf + offset, miter.addr, len); >>> + else >>> + memcpy(miter.addr, buf + offset, len); >>> + } >>> + >>> + offset += len; >>> + } >>> + >>> + sg_miter_stop(&miter); >>> +} >>> + >>> static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd) >>> { >>> struct meson_host *host = mmc_priv(mmc); >>> @@ -785,8 +827,7 @@ static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd) >>> if (data->flags & MMC_DATA_WRITE) { >>> cmd_cfg |= CMD_CFG_DATA_WR; >>> WARN_ON(xfer_bytes > host->bounce_buf_size); >>> - sg_copy_to_buffer(data->sg, data->sg_len, >>> - host->bounce_buf, xfer_bytes); >>> + meson_mmc_copy_buffer(host, data, xfer_bytes, true); >>> dma_wmb(); >>> } >>> >>> @@ -955,8 +996,7 @@ static irqreturn_t meson_mmc_irq_thread(int irq, void *dev_id) >>> if (meson_mmc_bounce_buf_read(data)) { >>> xfer_bytes = data->blksz * data->blocks; >>> WARN_ON(xfer_bytes > host->bounce_buf_size); >>> - sg_copy_from_buffer(data->sg, data->sg_len, >>> - host->bounce_buf, xfer_bytes); >>> + meson_mmc_copy_buffer(host, data, xfer_bytes, false); >>> } >>> >>> next_cmd = meson_mmc_get_next_command(cmd); >> >> Best regards >> > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel >
Hi Robin, On 09/06/2021 16:45, Robin Murphy wrote: > On 2021-06-09 14:07, Neil Armstrong wrote: >> Hi, >> >> On 08/06/2021 17:50, Marek Szyprowski wrote: >>> Hi >>> >>> On 08.06.2021 17:33, Neil Armstrong wrote: >>>> It has been reported that usage of memcpy() to/from an iomem mapping is invalid, >>>> and and recent arm64 memcpy update [1] triggers a memory abort when dram-access-quirk >>>> is used on the G12A/G12B platforms. >>>> >>>> This adds a local sg_copy_to_buffer which makes usage of io versions of memcpy >>>> when dram-access-quirk is enabled. >>>> >>>> Fixes: acdc8e71d9bb ("mmc: meson-gx: add dram-access-quirk") >>>> Reported-by: Marek Szyprowski <m.szyprowski@samsung.com> >>>> Suggested-by: Mark Rutland <mark.rutland@arm.com> >>>> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> >>>> >>>> [1] 285133040e6c ("arm64: Import latest memcpy()/memmove() implementation") >>>> >>>> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> >>>> --- >>>> Hi Ulf, Marek, Mark, >>>> >>>> I haven't tested the patch yet, but should fix issue reported at [2]. >>> >>> Works fine here and fixed the issue. >>> >>> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> >> >> Thanks, I'll need to rework to pass an __iomem pointer to memcpy_to/fromio so sparse doesn't scream anymore. > > Hmm, might it be worth factoring out general sg_copy_{to,from}_iomem() helpers? From a quick grep I found at least mv_cesa_sg_copy() already doing essentially the same thing as meson_mmc_copy_buffer(). It's definitely worth it, but since we need a quick fix, we should have meson_mmc_copy_buffer() as a fix then we should definitely move to sg_copy_{to,from}_iomem() helpers Neil > > Robin. > >> >> Neil >> >>> >>>> Neil >>>> >>>> [2] https://lore.kernel.org/r/acb244ad-0759-5a96-c659-5c23003d3dcd@samsung.com >>>> >>>> drivers/mmc/host/meson-gx-mmc.c | 48 ++++++++++++++++++++++++++++++--- >>>> 1 file changed, 44 insertions(+), 4 deletions(-) >>>> >>>> diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c >>>> index b8b771b643cc..89ff6038092d 100644 >>>> --- a/drivers/mmc/host/meson-gx-mmc.c >>>> +++ b/drivers/mmc/host/meson-gx-mmc.c >>>> @@ -742,6 +742,48 @@ static void meson_mmc_desc_chain_transfer(struct mmc_host *mmc, u32 cmd_cfg) >>>> writel(start, host->regs + SD_EMMC_START); >>>> } >>>> +/* local sg copy to buffer version with _to/fromio usage for dram_access_quirk */ >>>> +static void meson_mmc_copy_buffer(struct meson_host *host, struct mmc_data *data, >>>> + size_t buflen, bool to_buffer) >>>> +{ >>>> + unsigned int sg_flags = SG_MITER_ATOMIC; >>>> + struct scatterlist *sgl = data->sg; >>>> + unsigned int nents = data->sg_len; >>>> + struct sg_mapping_iter miter; >>>> + void *buf = host->bounce_buf; >>>> + unsigned int offset = 0; >>>> + >>>> + if (to_buffer) >>>> + sg_flags |= SG_MITER_FROM_SG; >>>> + else >>>> + sg_flags |= SG_MITER_TO_SG; >>>> + >>>> + sg_miter_start(&miter, sgl, nents, sg_flags); >>>> + >>>> + while ((offset < buflen) && sg_miter_next(&miter)) { >>>> + unsigned int len; >>>> + >>>> + len = min(miter.length, buflen - offset); >>>> + >>>> + /* When dram_access_quirk, the bounce buffer is a iomem mapping */ >>>> + if (host->dram_access_quirk) { >>>> + if (to_buffer) >>>> + memcpy_toio(buf + offset, miter.addr, len); >>>> + else >>>> + memcpy_fromio(miter.addr, buf + offset, len); >>>> + } else { >>>> + if (to_buffer) >>>> + memcpy(buf + offset, miter.addr, len); >>>> + else >>>> + memcpy(miter.addr, buf + offset, len); >>>> + } >>>> + >>>> + offset += len; >>>> + } >>>> + >>>> + sg_miter_stop(&miter); >>>> +} >>>> + >>>> static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd) >>>> { >>>> struct meson_host *host = mmc_priv(mmc); >>>> @@ -785,8 +827,7 @@ static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd) >>>> if (data->flags & MMC_DATA_WRITE) { >>>> cmd_cfg |= CMD_CFG_DATA_WR; >>>> WARN_ON(xfer_bytes > host->bounce_buf_size); >>>> - sg_copy_to_buffer(data->sg, data->sg_len, >>>> - host->bounce_buf, xfer_bytes); >>>> + meson_mmc_copy_buffer(host, data, xfer_bytes, true); >>>> dma_wmb(); >>>> } >>>> @@ -955,8 +996,7 @@ static irqreturn_t meson_mmc_irq_thread(int irq, void *dev_id) >>>> if (meson_mmc_bounce_buf_read(data)) { >>>> xfer_bytes = data->blksz * data->blocks; >>>> WARN_ON(xfer_bytes > host->bounce_buf_size); >>>> - sg_copy_from_buffer(data->sg, data->sg_len, >>>> - host->bounce_buf, xfer_bytes); >>>> + meson_mmc_copy_buffer(host, data, xfer_bytes, false); >>>> } >>>> next_cmd = meson_mmc_get_next_command(cmd); >>> >>> Best regards >>> >> >> >> _______________________________________________ >> linux-arm-kernel mailing list >> linux-arm-kernel@lists.infradead.org >> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel >>
On 2021-06-09 15:55, Neil Armstrong wrote: > Hi Robin, > > On 09/06/2021 16:45, Robin Murphy wrote: >> On 2021-06-09 14:07, Neil Armstrong wrote: >>> Hi, >>> >>> On 08/06/2021 17:50, Marek Szyprowski wrote: >>>> Hi >>>> >>>> On 08.06.2021 17:33, Neil Armstrong wrote: >>>>> It has been reported that usage of memcpy() to/from an iomem mapping is invalid, >>>>> and and recent arm64 memcpy update [1] triggers a memory abort when dram-access-quirk >>>>> is used on the G12A/G12B platforms. >>>>> >>>>> This adds a local sg_copy_to_buffer which makes usage of io versions of memcpy >>>>> when dram-access-quirk is enabled. >>>>> >>>>> Fixes: acdc8e71d9bb ("mmc: meson-gx: add dram-access-quirk") >>>>> Reported-by: Marek Szyprowski <m.szyprowski@samsung.com> >>>>> Suggested-by: Mark Rutland <mark.rutland@arm.com> >>>>> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> >>>>> >>>>> [1] 285133040e6c ("arm64: Import latest memcpy()/memmove() implementation") >>>>> >>>>> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> >>>>> --- >>>>> Hi Ulf, Marek, Mark, >>>>> >>>>> I haven't tested the patch yet, but should fix issue reported at [2]. >>>> >>>> Works fine here and fixed the issue. >>>> >>>> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> >>> >>> Thanks, I'll need to rework to pass an __iomem pointer to memcpy_to/fromio so sparse doesn't scream anymore. >> >> Hmm, might it be worth factoring out general sg_copy_{to,from}_iomem() helpers? From a quick grep I found at least mv_cesa_sg_copy() already doing essentially the same thing as meson_mmc_copy_buffer(). > > It's definitely worth it, but since we need a quick fix, we should have meson_mmc_copy_buffer() as a fix then we should definitely move to sg_copy_{to,from}_iomem() helpers Oh, that makes sense for sure - I was just doing some general thinking out loud before I forget about the whole thing :) Cheers, Robin.
diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c index b8b771b643cc..89ff6038092d 100644 --- a/drivers/mmc/host/meson-gx-mmc.c +++ b/drivers/mmc/host/meson-gx-mmc.c @@ -742,6 +742,48 @@ static void meson_mmc_desc_chain_transfer(struct mmc_host *mmc, u32 cmd_cfg) writel(start, host->regs + SD_EMMC_START); } +/* local sg copy to buffer version with _to/fromio usage for dram_access_quirk */ +static void meson_mmc_copy_buffer(struct meson_host *host, struct mmc_data *data, + size_t buflen, bool to_buffer) +{ + unsigned int sg_flags = SG_MITER_ATOMIC; + struct scatterlist *sgl = data->sg; + unsigned int nents = data->sg_len; + struct sg_mapping_iter miter; + void *buf = host->bounce_buf; + unsigned int offset = 0; + + if (to_buffer) + sg_flags |= SG_MITER_FROM_SG; + else + sg_flags |= SG_MITER_TO_SG; + + sg_miter_start(&miter, sgl, nents, sg_flags); + + while ((offset < buflen) && sg_miter_next(&miter)) { + unsigned int len; + + len = min(miter.length, buflen - offset); + + /* When dram_access_quirk, the bounce buffer is a iomem mapping */ + if (host->dram_access_quirk) { + if (to_buffer) + memcpy_toio(buf + offset, miter.addr, len); + else + memcpy_fromio(miter.addr, buf + offset, len); + } else { + if (to_buffer) + memcpy(buf + offset, miter.addr, len); + else + memcpy(miter.addr, buf + offset, len); + } + + offset += len; + } + + sg_miter_stop(&miter); +} + static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd) { struct meson_host *host = mmc_priv(mmc); @@ -785,8 +827,7 @@ static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd) if (data->flags & MMC_DATA_WRITE) { cmd_cfg |= CMD_CFG_DATA_WR; WARN_ON(xfer_bytes > host->bounce_buf_size); - sg_copy_to_buffer(data->sg, data->sg_len, - host->bounce_buf, xfer_bytes); + meson_mmc_copy_buffer(host, data, xfer_bytes, true); dma_wmb(); } @@ -955,8 +996,7 @@ static irqreturn_t meson_mmc_irq_thread(int irq, void *dev_id) if (meson_mmc_bounce_buf_read(data)) { xfer_bytes = data->blksz * data->blocks; WARN_ON(xfer_bytes > host->bounce_buf_size); - sg_copy_from_buffer(data->sg, data->sg_len, - host->bounce_buf, xfer_bytes); + meson_mmc_copy_buffer(host, data, xfer_bytes, false); } next_cmd = meson_mmc_get_next_command(cmd);
It has been reported that usage of memcpy() to/from an iomem mapping is invalid, and and recent arm64 memcpy update [1] triggers a memory abort when dram-access-quirk is used on the G12A/G12B platforms. This adds a local sg_copy_to_buffer which makes usage of io versions of memcpy when dram-access-quirk is enabled. Fixes: acdc8e71d9bb ("mmc: meson-gx: add dram-access-quirk") Reported-by: Marek Szyprowski <m.szyprowski@samsung.com> Suggested-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> [1] 285133040e6c ("arm64: Import latest memcpy()/memmove() implementation") Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> --- Hi Ulf, Marek, Mark, I haven't tested the patch yet, but should fix issue reported at [2]. Neil [2] https://lore.kernel.org/r/acb244ad-0759-5a96-c659-5c23003d3dcd@samsung.com drivers/mmc/host/meson-gx-mmc.c | 48 ++++++++++++++++++++++++++++++--- 1 file changed, 44 insertions(+), 4 deletions(-)