| Message ID | 20231222090051.3265307-4-42.hyeyoo@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | A Followup for "QEMU: CXL mailbox rework and features (Part 1)" | expand |
On Fri, 22 Dec 2023 18:00:50 +0900 Hyeonggon Yoo <42.hyeyoo@gmail.com> wrote: > The spec states that reads/writes should have no effect and a part of > commands should be ignored when the media is disabled, not when the > sanitize command is running.qq > > Introduce cxl_dev_media_disabled() to check if the media is disabled and > replace sanitize_running() with it. > > Make sure that the media has been correctly disabled during sanitation > by adding an assert to __toggle_media(). Now, enabling when already > enabled or vice versa results in an assert() failure. > > Suggested-by: Davidlohr Bueso <dave@stgolabs.net> > Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> This applies to hw/cxl: Add get scan media capabilities cmd support. Should I just squash it with that patch in my tree? For now I'm holding it immediately on top of that, but I'm not keen to send messy code upstream unless there is a good reason to retain the history. If you are doing this sort of fix series in future, please call out what they fix explicitly. Can't use fixes tags as the commit ids are unstable, but can mention the patch to make my life easier! Thanks, Jonathan > --- > hw/cxl/cxl-mailbox-utils.c | 6 ++++-- > hw/mem/cxl_type3.c | 4 ++-- > include/hw/cxl/cxl_device.h | 11 ++++++----- > 3 files changed, 12 insertions(+), 9 deletions(-) > > diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c > index 11ec8b648b..efeb5f8174 100644 > --- a/hw/cxl/cxl-mailbox-utils.c > +++ b/hw/cxl/cxl-mailbox-utils.c > @@ -2248,6 +2248,8 @@ int cxl_process_cci_message(CXLCCI *cci, uint8_t set, uint8_t cmd, > int ret; > const struct cxl_cmd *cxl_cmd; > opcode_handler h; > + CXLDeviceState *cxl_dstate = &CXL_TYPE3(cci->intf)->cxl_dstate; > + > > *len_out = 0; > cxl_cmd = &cci->cxl_cmd_set[set][cmd]; > @@ -2268,8 +2270,8 @@ int cxl_process_cci_message(CXLCCI *cci, uint8_t set, uint8_t cmd, > return CXL_MBOX_BUSY; > } > > - /* forbid any selected commands while overwriting */ > - if (sanitize_running(cci)) { > + /* forbid any selected commands while the media is disabled */ > + if (cxl_dev_media_disabled(cxl_dstate)) { > if (h == cmd_events_get_records || > h == cmd_ccls_get_partition_info || > h == cmd_ccls_set_lsa || > diff --git a/hw/mem/cxl_type3.c b/hw/mem/cxl_type3.c > index 85fc08f118..ecb525a608 100644 > --- a/hw/mem/cxl_type3.c > +++ b/hw/mem/cxl_type3.c > @@ -1286,7 +1286,7 @@ MemTxResult cxl_type3_read(PCIDevice *d, hwaddr host_addr, uint64_t *data, > return MEMTX_ERROR; > } > > - if (sanitize_running(&ct3d->cci)) { > + if (cxl_dev_media_disabled(&ct3d->cxl_dstate)) { > qemu_guest_getrandom_nofail(data, size); > return MEMTX_OK; > } > @@ -1314,7 +1314,7 @@ MemTxResult cxl_type3_write(PCIDevice *d, hwaddr host_addr, uint64_t data, > return MEMTX_ERROR; > } > > - if (sanitize_running(&ct3d->cci)) { > + if (cxl_dev_media_disabled(&ct3d->cxl_dstate)) { > return MEMTX_OK; > } > > diff --git a/include/hw/cxl/cxl_device.h b/include/hw/cxl/cxl_device.h > index b318d94b36..5618061ebe 100644 > --- a/include/hw/cxl/cxl_device.h > +++ b/include/hw/cxl/cxl_device.h > @@ -411,6 +411,7 @@ static inline void __toggle_media(CXLDeviceState *cxl_dstate, int val) > dev_status_reg = cxl_dstate->mbox_reg_state64[R_CXL_MEM_DEV_STS]; > dev_status_reg = FIELD_DP64(dev_status_reg, CXL_MEM_DEV_STS, MEDIA_STATUS, > val); > + assert(dev_status_reg != cxl_dstate->mbox_reg_state64[R_CXL_MEM_DEV_STS]); > cxl_dstate->mbox_reg_state64[R_CXL_MEM_DEV_STS] = dev_status_reg; > } > #define cxl_dev_disable_media(cxlds) \ > @@ -418,14 +419,14 @@ static inline void __toggle_media(CXLDeviceState *cxl_dstate, int val) > #define cxl_dev_enable_media(cxlds) \ > do { __toggle_media((cxlds), 0x1); } while (0) > > -static inline bool scan_media_running(CXLCCI *cci) > +static inline bool cxl_dev_media_disabled(CXLDeviceState *cxl_dstate) > { > - return !!cci->bg.runtime && cci->bg.opcode == 0x4304; > + uint64_t dev_status_reg = cxl_dstate->mbox_reg_state64[R_CXL_MEM_DEV_STS]; > + return FIELD_EX64(dev_status_reg, CXL_MEM_DEV_STS, MEDIA_STATUS) == 0x3; > } > - > -static inline bool sanitize_running(CXLCCI *cci) > +static inline bool scan_media_running(CXLCCI *cci) > { > - return !!cci->bg.runtime && cci->bg.opcode == 0x4400; > + return !!cci->bg.runtime && cci->bg.opcode == 0x4304; > } > > typedef struct CXLError {
On Tue, Jan 9, 2024 at 12:54 PM Jonathan Cameron <Jonathan.Cameron@huawei.com> wrote: > > On Fri, 22 Dec 2023 18:00:50 +0900 > Hyeonggon Yoo <42.hyeyoo@gmail.com> wrote: > > > The spec states that reads/writes should have no effect and a part of > > commands should be ignored when the media is disabled, not when the > > sanitize command is running.qq > > > > Introduce cxl_dev_media_disabled() to check if the media is disabled and > > replace sanitize_running() with it. > > > > Make sure that the media has been correctly disabled during sanitation > > by adding an assert to __toggle_media(). Now, enabling when already > > enabled or vice versa results in an assert() failure. > > > > Suggested-by: Davidlohr Bueso <dave@stgolabs.net> > > Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> > > This applies to > > hw/cxl: Add get scan media capabilities cmd support. > > Should I just squash it with that patch in my tree? > For now I'm holding it immediately on top of that, but I'm not keen to > send messy code upstream unless there is a good reason to retain the > history. Oh, while the diff looks like the patch touches scan_media_running(), it's not. The proper Fixes: tag will be: Fixes: d77176724422 ("hw/cxl: Add support for device sanitation") > If you are doing this sort of fix series in future, please call out > what they fix explicitly. Can't use fixes tags as the commit ids > are unstable, but can mention the patch to make my life easier! Okay, next time I will either add the Fixes tag or add a comment on what it fixes. By the way I guess your latest, public branch is still cxl-2023-11-02, right? https://gitlab.com/jic23/qemu/-/tree/cxl-2023-11-02 I assume you adjusted my v2 series, but please let me know if you prefer sending v3 against your latest tree. Thanks, Hyeonggon
On Sun, 21 Jan 2024 21:50:00 -0500 Hyeonggon Yoo <42.hyeyoo@gmail.com> wrote: > On Tue, Jan 9, 2024 at 12:54 PM Jonathan Cameron > <Jonathan.Cameron@huawei.com> wrote: > > > > On Fri, 22 Dec 2023 18:00:50 +0900 > > Hyeonggon Yoo <42.hyeyoo@gmail.com> wrote: > > > > > The spec states that reads/writes should have no effect and a part of > > > commands should be ignored when the media is disabled, not when the > > > sanitize command is running.qq > > > > > > Introduce cxl_dev_media_disabled() to check if the media is disabled and > > > replace sanitize_running() with it. > > > > > > Make sure that the media has been correctly disabled during sanitation > > > by adding an assert to __toggle_media(). Now, enabling when already > > > enabled or vice versa results in an assert() failure. > > > > > > Suggested-by: Davidlohr Bueso <dave@stgolabs.net> > > > Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> > > > > This applies to > > > > hw/cxl: Add get scan media capabilities cmd support. > > > > Should I just squash it with that patch in my tree? > > For now I'm holding it immediately on top of that, but I'm not keen to > > send messy code upstream unless there is a good reason to retain the > > history. > > Oh, while the diff looks like the patch touches scan_media_running(), it's not. > > The proper Fixes: tag will be: > Fixes: d77176724422 ("hw/cxl: Add support for device sanitation") > > > If you are doing this sort of fix series in future, please call out > > what they fix explicitly. Can't use fixes tags as the commit ids > > are unstable, but can mention the patch to make my life easier! > > Okay, next time I will either add the Fixes tag or add a comment on > what it fixes. > > By the way I guess your latest, public branch is still cxl-2023-11-02, right? > https://gitlab.com/jic23/qemu/-/tree/cxl-2023-11-02 > > I assume you adjusted my v2 series, but please let me know if you prefer > sending v3 against your latest tree. > > Thanks, > Hyeonggon Side note, in it's current form this breaks the switch-cci support in upstream QEMU. I've finally gotten back to getting ready to look at MMPT support and ran into a crash as a result. Needs protection with checked object_dynamic_cast() to make sure we have a type3 device. I'll update the patch in my tree. Thanks, Jonathan >
diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c index 11ec8b648b..efeb5f8174 100644 --- a/hw/cxl/cxl-mailbox-utils.c +++ b/hw/cxl/cxl-mailbox-utils.c @@ -2248,6 +2248,8 @@ int cxl_process_cci_message(CXLCCI *cci, uint8_t set, uint8_t cmd, int ret; const struct cxl_cmd *cxl_cmd; opcode_handler h; + CXLDeviceState *cxl_dstate = &CXL_TYPE3(cci->intf)->cxl_dstate; + *len_out = 0; cxl_cmd = &cci->cxl_cmd_set[set][cmd]; @@ -2268,8 +2270,8 @@ int cxl_process_cci_message(CXLCCI *cci, uint8_t set, uint8_t cmd, return CXL_MBOX_BUSY; } - /* forbid any selected commands while overwriting */ - if (sanitize_running(cci)) { + /* forbid any selected commands while the media is disabled */ + if (cxl_dev_media_disabled(cxl_dstate)) { if (h == cmd_events_get_records || h == cmd_ccls_get_partition_info || h == cmd_ccls_set_lsa || diff --git a/hw/mem/cxl_type3.c b/hw/mem/cxl_type3.c index 85fc08f118..ecb525a608 100644 --- a/hw/mem/cxl_type3.c +++ b/hw/mem/cxl_type3.c @@ -1286,7 +1286,7 @@ MemTxResult cxl_type3_read(PCIDevice *d, hwaddr host_addr, uint64_t *data, return MEMTX_ERROR; } - if (sanitize_running(&ct3d->cci)) { + if (cxl_dev_media_disabled(&ct3d->cxl_dstate)) { qemu_guest_getrandom_nofail(data, size); return MEMTX_OK; } @@ -1314,7 +1314,7 @@ MemTxResult cxl_type3_write(PCIDevice *d, hwaddr host_addr, uint64_t data, return MEMTX_ERROR; } - if (sanitize_running(&ct3d->cci)) { + if (cxl_dev_media_disabled(&ct3d->cxl_dstate)) { return MEMTX_OK; } diff --git a/include/hw/cxl/cxl_device.h b/include/hw/cxl/cxl_device.h index b318d94b36..5618061ebe 100644 --- a/include/hw/cxl/cxl_device.h +++ b/include/hw/cxl/cxl_device.h @@ -411,6 +411,7 @@ static inline void __toggle_media(CXLDeviceState *cxl_dstate, int val) dev_status_reg = cxl_dstate->mbox_reg_state64[R_CXL_MEM_DEV_STS]; dev_status_reg = FIELD_DP64(dev_status_reg, CXL_MEM_DEV_STS, MEDIA_STATUS, val); + assert(dev_status_reg != cxl_dstate->mbox_reg_state64[R_CXL_MEM_DEV_STS]); cxl_dstate->mbox_reg_state64[R_CXL_MEM_DEV_STS] = dev_status_reg; } #define cxl_dev_disable_media(cxlds) \ @@ -418,14 +419,14 @@ static inline void __toggle_media(CXLDeviceState *cxl_dstate, int val) #define cxl_dev_enable_media(cxlds) \ do { __toggle_media((cxlds), 0x1); } while (0) -static inline bool scan_media_running(CXLCCI *cci) +static inline bool cxl_dev_media_disabled(CXLDeviceState *cxl_dstate) { - return !!cci->bg.runtime && cci->bg.opcode == 0x4304; + uint64_t dev_status_reg = cxl_dstate->mbox_reg_state64[R_CXL_MEM_DEV_STS]; + return FIELD_EX64(dev_status_reg, CXL_MEM_DEV_STS, MEDIA_STATUS) == 0x3; } - -static inline bool sanitize_running(CXLCCI *cci) +static inline bool scan_media_running(CXLCCI *cci) { - return !!cci->bg.runtime && cci->bg.opcode == 0x4400; + return !!cci->bg.runtime && cci->bg.opcode == 0x4304; } typedef struct CXLError {
The spec states that reads/writes should have no effect and a part of commands should be ignored when the media is disabled, not when the sanitize command is running. Introduce cxl_dev_media_disabled() to check if the media is disabled and replace sanitize_running() with it. Make sure that the media has been correctly disabled during sanitation by adding an assert to __toggle_media(). Now, enabling when already enabled or vice versa results in an assert() failure. Suggested-by: Davidlohr Bueso <dave@stgolabs.net> Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> --- hw/cxl/cxl-mailbox-utils.c | 6 ++++-- hw/mem/cxl_type3.c | 4 ++-- include/hw/cxl/cxl_device.h | 11 ++++++----- 3 files changed, 12 insertions(+), 9 deletions(-)