| Message ID | 20230304010632.2127470-16-quic_eberman@quicinc.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Drivers for gunyah hypervisor | expand |
On 3/21/2023 7:23 AM, Srinivas Kandagatla wrote: > > > On 04/03/2023 01:06, Elliot Berman wrote: >> On Qualcomm platforms, there is a firmware entity which controls access >> to physical pages. In order to share memory with another VM, this entity >> needs to be informed that the guest VM should have access to the memory. >> >> Co-developed-by: Prakruthi Deepak Heragu <quic_pheragu@quicinc.com> >> Signed-off-by: Prakruthi Deepak Heragu <quic_pheragu@quicinc.com> >> Signed-off-by: Elliot Berman <quic_eberman@quicinc.com> >> --- >> drivers/virt/gunyah/Kconfig | 4 ++ >> drivers/virt/gunyah/Makefile | 1 + >> drivers/virt/gunyah/gunyah_platform_hooks.c | 80 +++++++++++++++++++++ >> drivers/virt/gunyah/rsc_mgr.h | 3 + >> drivers/virt/gunyah/rsc_mgr_rpc.c | 18 ++++- >> include/linux/gunyah_rsc_mgr.h | 17 +++++ >> 6 files changed, 121 insertions(+), 2 deletions(-) >> create mode 100644 drivers/virt/gunyah/gunyah_platform_hooks.c >> >> diff --git a/drivers/virt/gunyah/Kconfig b/drivers/virt/gunyah/Kconfig >> index 1a737694c333..de815189dab6 100644 >> --- a/drivers/virt/gunyah/Kconfig >> +++ b/drivers/virt/gunyah/Kconfig >> @@ -4,6 +4,7 @@ config GUNYAH >> tristate "Gunyah Virtualization drivers" >> depends on ARM64 >> depends on MAILBOX >> + select GUNYAH_PLATFORM_HOOKS >> help >> The Gunyah drivers are the helper interfaces that run in a >> guest VM >> such as basic inter-VM IPC and signaling mechanisms, and >> higher level >> @@ -11,3 +12,6 @@ config GUNYAH >> Say Y/M here to enable the drivers needed to interact in a Gunyah >> virtual environment. >> + >> +config GUNYAH_PLATFORM_HOOKS >> + tristate >> diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile >> index ff8bc4925392..6b8f84dbfe0d 100644 >> --- a/drivers/virt/gunyah/Makefile >> +++ b/drivers/virt/gunyah/Makefile >> @@ -1,6 +1,7 @@ >> # SPDX-License-Identifier: GPL-2.0 >> obj-$(CONFIG_GUNYAH) += gunyah.o >> +obj-$(CONFIG_GUNYAH_PLATFORM_HOOKS) += gunyah_platform_hooks.o >> gunyah_rsc_mgr-y += rsc_mgr.o rsc_mgr_rpc.o vm_mgr.o vm_mgr_mm.o >> obj-$(CONFIG_GUNYAH) += gunyah_rsc_mgr.o >> diff --git a/drivers/virt/gunyah/gunyah_platform_hooks.c >> b/drivers/virt/gunyah/gunyah_platform_hooks.c >> new file mode 100644 >> index 000000000000..60da0e154e98 >> --- /dev/null >> +++ b/drivers/virt/gunyah/gunyah_platform_hooks.c >> @@ -0,0 +1,80 @@ >> +// SPDX-License-Identifier: GPL-2.0-only >> +/* >> + * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All >> rights reserved. >> + */ >> + >> +#include <linux/module.h> >> +#include <linux/rwsem.h> >> +#include <linux/gunyah_rsc_mgr.h> >> + >> +#include "rsc_mgr.h" >> + >> +static struct gh_rm_platform_ops *rm_platform_ops; >> +static DECLARE_RWSEM(rm_platform_ops_lock); >> + >> +int gh_rm_platform_pre_mem_share(struct gh_rm *rm, struct >> gh_rm_mem_parcel *mem_parcel) > > I think I have asked this question but I can not find the answer to this > from old replies. > Why is this platform hooks not part of core gunyah? Do we need a > dedicated module for this. > By the looks of APIs I see this is very much close to rm and i think > this functionality should live with rm. > If the platform hooks were part of core gunyah, then core gunyah could only be enabled as =y in the default defconfig because QCOM_SCM would rely on the platform hooks (core gunyah). With the suggestion to move the SCM platform hooks into separate module, I can/will bring the platform hooks back into core gunyah module. - Elliot > --srini > +{ >> + int ret = 0; >> + >> + down_read(&rm_platform_ops_lock); >> + if (rm_platform_ops && rm_platform_ops->pre_mem_share) >> + ret = rm_platform_ops->pre_mem_share(rm, mem_parcel); >> + up_read(&rm_platform_ops_lock); >> + return ret; >> +} >> +EXPORT_SYMBOL_GPL(gh_rm_platform_pre_mem_share); >> + >> +int gh_rm_platform_post_mem_reclaim(struct gh_rm *rm, struct >> gh_rm_mem_parcel *mem_parcel) >> +{ >> + int ret = 0; >> + >> + down_read(&rm_platform_ops_lock); >> + if (rm_platform_ops && rm_platform_ops->post_mem_reclaim) >> + ret = rm_platform_ops->post_mem_reclaim(rm, mem_parcel); >> + up_read(&rm_platform_ops_lock); >> + return ret; >> +} >> +EXPORT_SYMBOL_GPL(gh_rm_platform_post_mem_reclaim); >> + >> +int gh_rm_register_platform_ops(struct gh_rm_platform_ops *platform_ops) >> +{ >> + int ret = 0; >> + >> + down_write(&rm_platform_ops_lock); >> + if (!rm_platform_ops) >> + rm_platform_ops = platform_ops; >> + else >> + ret = -EEXIST; >> + up_write(&rm_platform_ops_lock); >> + return ret; >> +} >> +EXPORT_SYMBOL_GPL(gh_rm_register_platform_ops); >> + >> +void gh_rm_unregister_platform_ops(struct gh_rm_platform_ops >> *platform_ops) >> +{ >> + down_write(&rm_platform_ops_lock); >> + if (rm_platform_ops == platform_ops) >> + rm_platform_ops = NULL; >> + up_write(&rm_platform_ops_lock); >> +} >> +EXPORT_SYMBOL_GPL(gh_rm_unregister_platform_ops); >> + >> +static void _devm_gh_rm_unregister_platform_ops(void *data) >> +{ >> + gh_rm_unregister_platform_ops(data); >> +} >> + >> +int devm_gh_rm_register_platform_ops(struct device *dev, struct >> gh_rm_platform_ops *ops) >> +{ >> + int ret; >> + >> + ret = gh_rm_register_platform_ops(ops); >> + if (ret) >> + return ret; >> + >> + return devm_add_action(dev, _devm_gh_rm_unregister_platform_ops, >> ops); >> +} >> +EXPORT_SYMBOL_GPL(devm_gh_rm_register_platform_ops); >> + >> +MODULE_LICENSE("GPL"); >> +MODULE_DESCRIPTION("Gunyah Platform Hooks"); >> diff --git a/drivers/virt/gunyah/rsc_mgr.h >> b/drivers/virt/gunyah/rsc_mgr.h >> index 3665ebc7b020..6838e736f361 100644 >> --- a/drivers/virt/gunyah/rsc_mgr.h >> +++ b/drivers/virt/gunyah/rsc_mgr.h >> @@ -13,4 +13,7 @@ struct gh_rm; >> int gh_rm_call(struct gh_rm *rsc_mgr, u32 message_id, void >> *req_buff, size_t req_buf_size, >> void **resp_buf, size_t *resp_buf_size); >> +int gh_rm_platform_pre_mem_share(struct gh_rm *rm, struct >> gh_rm_mem_parcel *mem_parcel); >> +int gh_rm_platform_post_mem_reclaim(struct gh_rm *rm, struct >> gh_rm_mem_parcel *mem_parcel); >> + >> #endif >> diff --git a/drivers/virt/gunyah/rsc_mgr_rpc.c >> b/drivers/virt/gunyah/rsc_mgr_rpc.c >> index 3df15ad5b97d..733be4dc8dd2 100644 >> --- a/drivers/virt/gunyah/rsc_mgr_rpc.c >> +++ b/drivers/virt/gunyah/rsc_mgr_rpc.c >> @@ -204,6 +204,12 @@ static int gh_rm_mem_lend_common(struct gh_rm >> *rm, u32 message_id, struct gh_rm_ >> if (!msg) >> return -ENOMEM; >> + ret = gh_rm_platform_pre_mem_share(rm, p); >> + if (ret) { >> + kfree(msg); >> + return ret; >> + } >> + >> req_header = msg; >> acl_section = (void *)req_header + sizeof(*req_header); >> mem_section = (void *)acl_section + struct_size(acl_section, >> entries, p->n_acl_entries); >> @@ -227,8 +233,10 @@ static int gh_rm_mem_lend_common(struct gh_rm >> *rm, u32 message_id, struct gh_rm_ >> ret = gh_rm_call(rm, message_id, msg, msg_size, (void **)&resp, >> &resp_size); >> kfree(msg); >> - if (ret) >> + if (ret) { >> + gh_rm_platform_post_mem_reclaim(rm, p); >> return ret; >> + } >> p->mem_handle = le32_to_cpu(*resp); >> @@ -283,8 +291,14 @@ int gh_rm_mem_reclaim(struct gh_rm *rm, struct >> gh_rm_mem_parcel *parcel) >> struct gh_rm_mem_release_req req = { >> .mem_handle = cpu_to_le32(parcel->mem_handle), >> }; >> + int ret; >> + >> + ret = gh_rm_call(rm, GH_RM_RPC_MEM_RECLAIM, &req, sizeof(req), >> NULL, NULL); >> + /* Do not call platform mem reclaim hooks: the reclaim didn't >> happen*/ >> + if (ret) >> + return ret; >> - return gh_rm_call(rm, GH_RM_RPC_MEM_RECLAIM, &req, sizeof(req), >> NULL, NULL); >> + return gh_rm_platform_post_mem_reclaim(rm, parcel); >> } >> /** >> diff --git a/include/linux/gunyah_rsc_mgr.h >> b/include/linux/gunyah_rsc_mgr.h >> index 8b0b46f28e39..515087931a2b 100644 >> --- a/include/linux/gunyah_rsc_mgr.h >> +++ b/include/linux/gunyah_rsc_mgr.h >> @@ -145,4 +145,21 @@ int gh_rm_get_hyp_resources(struct gh_rm *rm, u16 >> vmid, >> struct gh_rm_hyp_resources **resources); >> int gh_rm_get_vmid(struct gh_rm *rm, u16 *vmid); >> +struct gunyah_rm_platform_ops { >> + int (*pre_mem_share)(struct gh_rm *rm, struct gh_rm_mem_parcel >> *mem_parcel); >> + int (*post_mem_reclaim)(struct gh_rm *rm, struct gh_rm_mem_parcel >> *mem_parcel); >> +}; >> + >> +#if IS_ENABLED(CONFIG_GUNYAH_PLATFORM_HOOKS) >> +int gh_rm_register_platform_ops(struct gh_rm_platform_ops >> *platform_ops); >> +void gh_rm_unregister_platform_ops(struct gh_rm_platform_ops >> *platform_ops); >> +int devm_gh_rm_register_platform_ops(struct device *dev, struct >> gh_rm_platform_ops *ops); >> +#else >> +static inline int gh_rm_register_platform_ops(struct >> gh_rm_platform_ops *platform_ops) >> + { return 0; } >> +static inline void gh_rm_unregister_platform_ops(struct >> gh_rm_platform_ops *platform_ops) { } >> +static inline int devm_gh_rm_register_platform_ops(struct device *dev, >> + struct gh_rm_platform_ops *ops) { return 0; } >> +#endif >> + >> #endif
On 3/3/23 7:06 PM, Elliot Berman wrote: > On Qualcomm platforms, there is a firmware entity which controls access > to physical pages. In order to share memory with another VM, this entity > needs to be informed that the guest VM should have access to the memory. Will Gunyah ever be used on something other than a Qualcomm platform? Is there really any need to have these "platform hooks" conditionally compiled? One other comment below. -Alex > Co-developed-by: Prakruthi Deepak Heragu <quic_pheragu@quicinc.com> > Signed-off-by: Prakruthi Deepak Heragu <quic_pheragu@quicinc.com> > Signed-off-by: Elliot Berman <quic_eberman@quicinc.com> > --- > drivers/virt/gunyah/Kconfig | 4 ++ > drivers/virt/gunyah/Makefile | 1 + > drivers/virt/gunyah/gunyah_platform_hooks.c | 80 +++++++++++++++++++++ > drivers/virt/gunyah/rsc_mgr.h | 3 + > drivers/virt/gunyah/rsc_mgr_rpc.c | 18 ++++- > include/linux/gunyah_rsc_mgr.h | 17 +++++ > 6 files changed, 121 insertions(+), 2 deletions(-) > create mode 100644 drivers/virt/gunyah/gunyah_platform_hooks.c > > diff --git a/drivers/virt/gunyah/Kconfig b/drivers/virt/gunyah/Kconfig > index 1a737694c333..de815189dab6 100644 > --- a/drivers/virt/gunyah/Kconfig > +++ b/drivers/virt/gunyah/Kconfig > @@ -4,6 +4,7 @@ config GUNYAH > tristate "Gunyah Virtualization drivers" > depends on ARM64 > depends on MAILBOX > + select GUNYAH_PLATFORM_HOOKS > help > The Gunyah drivers are the helper interfaces that run in a guest VM > such as basic inter-VM IPC and signaling mechanisms, and higher level > @@ -11,3 +12,6 @@ config GUNYAH > > Say Y/M here to enable the drivers needed to interact in a Gunyah > virtual environment. > + > +config GUNYAH_PLATFORM_HOOKS > + tristate > diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile > index ff8bc4925392..6b8f84dbfe0d 100644 > --- a/drivers/virt/gunyah/Makefile > +++ b/drivers/virt/gunyah/Makefile > @@ -1,6 +1,7 @@ > # SPDX-License-Identifier: GPL-2.0 > > obj-$(CONFIG_GUNYAH) += gunyah.o > +obj-$(CONFIG_GUNYAH_PLATFORM_HOOKS) += gunyah_platform_hooks.o > > gunyah_rsc_mgr-y += rsc_mgr.o rsc_mgr_rpc.o vm_mgr.o vm_mgr_mm.o > obj-$(CONFIG_GUNYAH) += gunyah_rsc_mgr.o > diff --git a/drivers/virt/gunyah/gunyah_platform_hooks.c b/drivers/virt/gunyah/gunyah_platform_hooks.c > new file mode 100644 > index 000000000000..60da0e154e98 > --- /dev/null > +++ b/drivers/virt/gunyah/gunyah_platform_hooks.c > @@ -0,0 +1,80 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved. > + */ > + > +#include <linux/module.h> > +#include <linux/rwsem.h> > +#include <linux/gunyah_rsc_mgr.h> > + > +#include "rsc_mgr.h" > + > +static struct gh_rm_platform_ops *rm_platform_ops; > +static DECLARE_RWSEM(rm_platform_ops_lock); > + > +int gh_rm_platform_pre_mem_share(struct gh_rm *rm, struct gh_rm_mem_parcel *mem_parcel) > +{ > + int ret = 0; > + > + down_read(&rm_platform_ops_lock); > + if (rm_platform_ops && rm_platform_ops->pre_mem_share) > + ret = rm_platform_ops->pre_mem_share(rm, mem_parcel); > + up_read(&rm_platform_ops_lock); > + return ret; > +} > +EXPORT_SYMBOL_GPL(gh_rm_platform_pre_mem_share); > + > +int gh_rm_platform_post_mem_reclaim(struct gh_rm *rm, struct gh_rm_mem_parcel *mem_parcel) > +{ > + int ret = 0; > + > + down_read(&rm_platform_ops_lock); > + if (rm_platform_ops && rm_platform_ops->post_mem_reclaim) > + ret = rm_platform_ops->post_mem_reclaim(rm, mem_parcel); > + up_read(&rm_platform_ops_lock); > + return ret; > +} > +EXPORT_SYMBOL_GPL(gh_rm_platform_post_mem_reclaim); > + > +int gh_rm_register_platform_ops(struct gh_rm_platform_ops *platform_ops) > +{ > + int ret = 0; > + > + down_write(&rm_platform_ops_lock); > + if (!rm_platform_ops) > + rm_platform_ops = platform_ops; > + else > + ret = -EEXIST; > + up_write(&rm_platform_ops_lock); > + return ret; > +} > +EXPORT_SYMBOL_GPL(gh_rm_register_platform_ops); > + > +void gh_rm_unregister_platform_ops(struct gh_rm_platform_ops *platform_ops) > +{ > + down_write(&rm_platform_ops_lock); > + if (rm_platform_ops == platform_ops) > + rm_platform_ops = NULL; > + up_write(&rm_platform_ops_lock); > +} > +EXPORT_SYMBOL_GPL(gh_rm_unregister_platform_ops); > + > +static void _devm_gh_rm_unregister_platform_ops(void *data) > +{ > + gh_rm_unregister_platform_ops(data); > +} > + > +int devm_gh_rm_register_platform_ops(struct device *dev, struct gh_rm_platform_ops *ops) > +{ > + int ret; > + > + ret = gh_rm_register_platform_ops(ops); > + if (ret) > + return ret; > + > + return devm_add_action(dev, _devm_gh_rm_unregister_platform_ops, ops); > +} > +EXPORT_SYMBOL_GPL(devm_gh_rm_register_platform_ops); > + > +MODULE_LICENSE("GPL"); > +MODULE_DESCRIPTION("Gunyah Platform Hooks"); > diff --git a/drivers/virt/gunyah/rsc_mgr.h b/drivers/virt/gunyah/rsc_mgr.h > index 3665ebc7b020..6838e736f361 100644 > --- a/drivers/virt/gunyah/rsc_mgr.h > +++ b/drivers/virt/gunyah/rsc_mgr.h > @@ -13,4 +13,7 @@ struct gh_rm; > int gh_rm_call(struct gh_rm *rsc_mgr, u32 message_id, void *req_buff, size_t req_buf_size, > void **resp_buf, size_t *resp_buf_size); > > +int gh_rm_platform_pre_mem_share(struct gh_rm *rm, struct gh_rm_mem_parcel *mem_parcel); > +int gh_rm_platform_post_mem_reclaim(struct gh_rm *rm, struct gh_rm_mem_parcel *mem_parcel); > + > #endif > diff --git a/drivers/virt/gunyah/rsc_mgr_rpc.c b/drivers/virt/gunyah/rsc_mgr_rpc.c > index 3df15ad5b97d..733be4dc8dd2 100644 > --- a/drivers/virt/gunyah/rsc_mgr_rpc.c > +++ b/drivers/virt/gunyah/rsc_mgr_rpc.c > @@ -204,6 +204,12 @@ static int gh_rm_mem_lend_common(struct gh_rm *rm, u32 message_id, struct gh_rm_ > if (!msg) > return -ENOMEM; > > + ret = gh_rm_platform_pre_mem_share(rm, p); > + if (ret) { > + kfree(msg); > + return ret; > + } > + > req_header = msg; > acl_section = (void *)req_header + sizeof(*req_header); > mem_section = (void *)acl_section + struct_size(acl_section, entries, p->n_acl_entries); > @@ -227,8 +233,10 @@ static int gh_rm_mem_lend_common(struct gh_rm *rm, u32 message_id, struct gh_rm_ > ret = gh_rm_call(rm, message_id, msg, msg_size, (void **)&resp, &resp_size); > kfree(msg); > > - if (ret) > + if (ret) { > + gh_rm_platform_post_mem_reclaim(rm, p); > return ret; > + } > > p->mem_handle = le32_to_cpu(*resp); > > @@ -283,8 +291,14 @@ int gh_rm_mem_reclaim(struct gh_rm *rm, struct gh_rm_mem_parcel *parcel) > struct gh_rm_mem_release_req req = { > .mem_handle = cpu_to_le32(parcel->mem_handle), > }; > + int ret; > + > + ret = gh_rm_call(rm, GH_RM_RPC_MEM_RECLAIM, &req, sizeof(req), NULL, NULL); > + /* Do not call platform mem reclaim hooks: the reclaim didn't happen*/ Move the comment above the gh_rm_call() call, and rephrase, such as: /* Only call platform mem reclaim hooks if... */ > + if (ret) > + return ret; > > - return gh_rm_call(rm, GH_RM_RPC_MEM_RECLAIM, &req, sizeof(req), NULL, NULL); > + return gh_rm_platform_post_mem_reclaim(rm, parcel); > } > > /** > diff --git a/include/linux/gunyah_rsc_mgr.h b/include/linux/gunyah_rsc_mgr.h > index 8b0b46f28e39..515087931a2b 100644 > --- a/include/linux/gunyah_rsc_mgr.h > +++ b/include/linux/gunyah_rsc_mgr.h > @@ -145,4 +145,21 @@ int gh_rm_get_hyp_resources(struct gh_rm *rm, u16 vmid, > struct gh_rm_hyp_resources **resources); > int gh_rm_get_vmid(struct gh_rm *rm, u16 *vmid); > > +struct gunyah_rm_platform_ops { > + int (*pre_mem_share)(struct gh_rm *rm, struct gh_rm_mem_parcel *mem_parcel); > + int (*post_mem_reclaim)(struct gh_rm *rm, struct gh_rm_mem_parcel *mem_parcel); > +}; > + > +#if IS_ENABLED(CONFIG_GUNYAH_PLATFORM_HOOKS) > +int gh_rm_register_platform_ops(struct gh_rm_platform_ops *platform_ops); > +void gh_rm_unregister_platform_ops(struct gh_rm_platform_ops *platform_ops); > +int devm_gh_rm_register_platform_ops(struct device *dev, struct gh_rm_platform_ops *ops); > +#else > +static inline int gh_rm_register_platform_ops(struct gh_rm_platform_ops *platform_ops) > + { return 0; } > +static inline void gh_rm_unregister_platform_ops(struct gh_rm_platform_ops *platform_ops) { } > +static inline int devm_gh_rm_register_platform_ops(struct device *dev, > + struct gh_rm_platform_ops *ops) { return 0; } > +#endif > + > #endif
diff --git a/drivers/virt/gunyah/Kconfig b/drivers/virt/gunyah/Kconfig index 1a737694c333..de815189dab6 100644 --- a/drivers/virt/gunyah/Kconfig +++ b/drivers/virt/gunyah/Kconfig @@ -4,6 +4,7 @@ config GUNYAH tristate "Gunyah Virtualization drivers" depends on ARM64 depends on MAILBOX + select GUNYAH_PLATFORM_HOOKS help The Gunyah drivers are the helper interfaces that run in a guest VM such as basic inter-VM IPC and signaling mechanisms, and higher level @@ -11,3 +12,6 @@ config GUNYAH Say Y/M here to enable the drivers needed to interact in a Gunyah virtual environment. + +config GUNYAH_PLATFORM_HOOKS + tristate diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile index ff8bc4925392..6b8f84dbfe0d 100644 --- a/drivers/virt/gunyah/Makefile +++ b/drivers/virt/gunyah/Makefile @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_GUNYAH) += gunyah.o +obj-$(CONFIG_GUNYAH_PLATFORM_HOOKS) += gunyah_platform_hooks.o gunyah_rsc_mgr-y += rsc_mgr.o rsc_mgr_rpc.o vm_mgr.o vm_mgr_mm.o obj-$(CONFIG_GUNYAH) += gunyah_rsc_mgr.o diff --git a/drivers/virt/gunyah/gunyah_platform_hooks.c b/drivers/virt/gunyah/gunyah_platform_hooks.c new file mode 100644 index 000000000000..60da0e154e98 --- /dev/null +++ b/drivers/virt/gunyah/gunyah_platform_hooks.c @@ -0,0 +1,80 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved. + */ + +#include <linux/module.h> +#include <linux/rwsem.h> +#include <linux/gunyah_rsc_mgr.h> + +#include "rsc_mgr.h" + +static struct gh_rm_platform_ops *rm_platform_ops; +static DECLARE_RWSEM(rm_platform_ops_lock); + +int gh_rm_platform_pre_mem_share(struct gh_rm *rm, struct gh_rm_mem_parcel *mem_parcel) +{ + int ret = 0; + + down_read(&rm_platform_ops_lock); + if (rm_platform_ops && rm_platform_ops->pre_mem_share) + ret = rm_platform_ops->pre_mem_share(rm, mem_parcel); + up_read(&rm_platform_ops_lock); + return ret; +} +EXPORT_SYMBOL_GPL(gh_rm_platform_pre_mem_share); + +int gh_rm_platform_post_mem_reclaim(struct gh_rm *rm, struct gh_rm_mem_parcel *mem_parcel) +{ + int ret = 0; + + down_read(&rm_platform_ops_lock); + if (rm_platform_ops && rm_platform_ops->post_mem_reclaim) + ret = rm_platform_ops->post_mem_reclaim(rm, mem_parcel); + up_read(&rm_platform_ops_lock); + return ret; +} +EXPORT_SYMBOL_GPL(gh_rm_platform_post_mem_reclaim); + +int gh_rm_register_platform_ops(struct gh_rm_platform_ops *platform_ops) +{ + int ret = 0; + + down_write(&rm_platform_ops_lock); + if (!rm_platform_ops) + rm_platform_ops = platform_ops; + else + ret = -EEXIST; + up_write(&rm_platform_ops_lock); + return ret; +} +EXPORT_SYMBOL_GPL(gh_rm_register_platform_ops); + +void gh_rm_unregister_platform_ops(struct gh_rm_platform_ops *platform_ops) +{ + down_write(&rm_platform_ops_lock); + if (rm_platform_ops == platform_ops) + rm_platform_ops = NULL; + up_write(&rm_platform_ops_lock); +} +EXPORT_SYMBOL_GPL(gh_rm_unregister_platform_ops); + +static void _devm_gh_rm_unregister_platform_ops(void *data) +{ + gh_rm_unregister_platform_ops(data); +} + +int devm_gh_rm_register_platform_ops(struct device *dev, struct gh_rm_platform_ops *ops) +{ + int ret; + + ret = gh_rm_register_platform_ops(ops); + if (ret) + return ret; + + return devm_add_action(dev, _devm_gh_rm_unregister_platform_ops, ops); +} +EXPORT_SYMBOL_GPL(devm_gh_rm_register_platform_ops); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Gunyah Platform Hooks"); diff --git a/drivers/virt/gunyah/rsc_mgr.h b/drivers/virt/gunyah/rsc_mgr.h index 3665ebc7b020..6838e736f361 100644 --- a/drivers/virt/gunyah/rsc_mgr.h +++ b/drivers/virt/gunyah/rsc_mgr.h @@ -13,4 +13,7 @@ struct gh_rm; int gh_rm_call(struct gh_rm *rsc_mgr, u32 message_id, void *req_buff, size_t req_buf_size, void **resp_buf, size_t *resp_buf_size); +int gh_rm_platform_pre_mem_share(struct gh_rm *rm, struct gh_rm_mem_parcel *mem_parcel); +int gh_rm_platform_post_mem_reclaim(struct gh_rm *rm, struct gh_rm_mem_parcel *mem_parcel); + #endif diff --git a/drivers/virt/gunyah/rsc_mgr_rpc.c b/drivers/virt/gunyah/rsc_mgr_rpc.c index 3df15ad5b97d..733be4dc8dd2 100644 --- a/drivers/virt/gunyah/rsc_mgr_rpc.c +++ b/drivers/virt/gunyah/rsc_mgr_rpc.c @@ -204,6 +204,12 @@ static int gh_rm_mem_lend_common(struct gh_rm *rm, u32 message_id, struct gh_rm_ if (!msg) return -ENOMEM; + ret = gh_rm_platform_pre_mem_share(rm, p); + if (ret) { + kfree(msg); + return ret; + } + req_header = msg; acl_section = (void *)req_header + sizeof(*req_header); mem_section = (void *)acl_section + struct_size(acl_section, entries, p->n_acl_entries); @@ -227,8 +233,10 @@ static int gh_rm_mem_lend_common(struct gh_rm *rm, u32 message_id, struct gh_rm_ ret = gh_rm_call(rm, message_id, msg, msg_size, (void **)&resp, &resp_size); kfree(msg); - if (ret) + if (ret) { + gh_rm_platform_post_mem_reclaim(rm, p); return ret; + } p->mem_handle = le32_to_cpu(*resp); @@ -283,8 +291,14 @@ int gh_rm_mem_reclaim(struct gh_rm *rm, struct gh_rm_mem_parcel *parcel) struct gh_rm_mem_release_req req = { .mem_handle = cpu_to_le32(parcel->mem_handle), }; + int ret; + + ret = gh_rm_call(rm, GH_RM_RPC_MEM_RECLAIM, &req, sizeof(req), NULL, NULL); + /* Do not call platform mem reclaim hooks: the reclaim didn't happen*/ + if (ret) + return ret; - return gh_rm_call(rm, GH_RM_RPC_MEM_RECLAIM, &req, sizeof(req), NULL, NULL); + return gh_rm_platform_post_mem_reclaim(rm, parcel); } /** diff --git a/include/linux/gunyah_rsc_mgr.h b/include/linux/gunyah_rsc_mgr.h index 8b0b46f28e39..515087931a2b 100644 --- a/include/linux/gunyah_rsc_mgr.h +++ b/include/linux/gunyah_rsc_mgr.h @@ -145,4 +145,21 @@ int gh_rm_get_hyp_resources(struct gh_rm *rm, u16 vmid, struct gh_rm_hyp_resources **resources); int gh_rm_get_vmid(struct gh_rm *rm, u16 *vmid); +struct gunyah_rm_platform_ops { + int (*pre_mem_share)(struct gh_rm *rm, struct gh_rm_mem_parcel *mem_parcel); + int (*post_mem_reclaim)(struct gh_rm *rm, struct gh_rm_mem_parcel *mem_parcel); +}; + +#if IS_ENABLED(CONFIG_GUNYAH_PLATFORM_HOOKS) +int gh_rm_register_platform_ops(struct gh_rm_platform_ops *platform_ops); +void gh_rm_unregister_platform_ops(struct gh_rm_platform_ops *platform_ops); +int devm_gh_rm_register_platform_ops(struct device *dev, struct gh_rm_platform_ops *ops); +#else +static inline int gh_rm_register_platform_ops(struct gh_rm_platform_ops *platform_ops) + { return 0; } +static inline void gh_rm_unregister_platform_ops(struct gh_rm_platform_ops *platform_ops) { } +static inline int devm_gh_rm_register_platform_ops(struct device *dev, + struct gh_rm_platform_ops *ops) { return 0; } +#endif + #endif