Messages in this thread | | | From | Jens Wiklander <> | Date | Thu, 1 Sep 2022 10:43:58 +0200 | Subject | Re: [PATCH 7/9] firmware: arm_ffa: Add v1.1 get_partition_info support |
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On Tue, Aug 30, 2022 at 12:07 PM Sudeep Holla <sudeep.holla@arm.com> wrote: > > FF-A v1.1 adds support to discovery the UUIDs of the partitions that was > missing in v1.0 and which the driver workarounds by using UUIDs supplied > by the ffa_drivers. > > Add the v1.1 get_partition_info support and disable the workaround if > the detected FF-A version is greater than v1.0. > > Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> > --- > drivers/firmware/arm_ffa/driver.c | 39 ++++++++++++++++++++++++------- > include/linux/arm_ffa.h | 1 + > 2 files changed, 32 insertions(+), 8 deletions(-) > > diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c > index 5c8484b05c50..6822241168d6 100644 > --- a/drivers/firmware/arm_ffa/driver.c > +++ b/drivers/firmware/arm_ffa/driver.c > @@ -264,18 +264,24 @@ static int ffa_rxtx_unmap(u16 vm_id) > return 0; > } > > +#define PARTITION_INFO_GET_RETURN_COUNT_ONLY BIT(0) > + > /* buffer must be sizeof(struct ffa_partition_info) * num_partitions */ > static int > __ffa_partition_info_get(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3, > struct ffa_partition_info *buffer, int num_partitions) > { > - int count; > + int idx, count, flags = 0, size; > ffa_value_t partition_info; > > + if (!buffer || !num_partitions) /* Just get the count for now */ > + flags = PARTITION_INFO_GET_RETURN_COUNT_ONLY; > + > mutex_lock(&drv_info->rx_lock); > invoke_ffa_fn((ffa_value_t){ > .a0 = FFA_PARTITION_INFO_GET, > .a1 = uuid0, .a2 = uuid1, .a3 = uuid2, .a4 = uuid3, > + .a5 = flags, > }, &partition_info); > > if (partition_info.a0 == FFA_ERROR) { > @@ -285,8 +291,15 @@ __ffa_partition_info_get(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3, > > count = partition_info.a2; > > + if (drv_info->version > FFA_VERSION_1_0) > + size = partition_info.a3;
What happens if this value is larger than sizeof(struct ffa_partition_info)?
> + else > + size = 8; /* FFA_VERSION_1_0 lacks size in the response */ > + > if (buffer && count <= num_partitions) > - memcpy(buffer, drv_info->rx_buffer, sizeof(*buffer) * count); > + for (idx = 0; idx < count; idx++) > + memcpy(buffer + idx, drv_info->rx_buffer + idx * size, > + size); > > ffa_rx_release(); > > @@ -678,6 +691,14 @@ void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid) > int count, idx; > struct ffa_partition_info *pbuf, *tpbuf; > > + /* > + * FF-A v1.1 provides UUID for each partition as part of the discovery > + * API, the discovered UUID must be populated in the device's UUID and > + * there is no need to copy the same from the driver table. > + */ > + if (drv_info->version > FFA_VERSION_1_0) > + return; > + > count = ffa_partition_probe(uuid, &pbuf); > if (count <= 0) > return; > @@ -691,6 +712,7 @@ void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid) > static void ffa_setup_partitions(void) > { > int count, idx; > + uuid_t uuid; > struct ffa_device *ffa_dev; > struct ffa_partition_info *pbuf, *tpbuf; > > @@ -701,14 +723,15 @@ static void ffa_setup_partitions(void) > } > > for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++) { > - /* Note that the &uuid_null parameter will require > + import_uuid(&uuid, (u8 *)tpbuf->uuid); > + > + /* Note that the UUID will be uuid_null and that will require
Note that if the UUID is uuid_null, that will require ...
Cheers, Jen s
> * ffa_device_match() to find the UUID of this partition id > - * with help of ffa_device_match_uuid(). Once the FF-A spec > - * is updated to provide correct UUID here for each partition > - * as part of the discovery API, we need to pass the > - * discovered UUID here instead. > + * with help of ffa_device_match_uuid(). FF-A v1.1 and above > + * provides UUID here for each partition as part of the > + * discovery API and the same is passed. > */ > - ffa_dev = ffa_device_register(&uuid_null, tpbuf->id, &ffa_ops); > + ffa_dev = ffa_device_register(&uuid, tpbuf->id, &ffa_ops); > if (!ffa_dev) { > pr_err("%s: failed to register partition ID 0x%x\n", > __func__, tpbuf->id); > diff --git a/include/linux/arm_ffa.h b/include/linux/arm_ffa.h > index eafab07c9f58..b40afa7933dc 100644 > --- a/include/linux/arm_ffa.h > +++ b/include/linux/arm_ffa.h > @@ -107,6 +107,7 @@ struct ffa_partition_info { > /* partition can send and receive indirect messages. */ > #define FFA_PARTITION_INDIRECT_MSG BIT(2) > u32 properties; > + u32 uuid[4]; > }; > > /* For use with FFA_MSG_SEND_DIRECT_{REQ,RESP} which pass data via registers */ > -- > 2.37.2 >
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