diff mbox series

[v11,03/26] gunyah: Common types and error codes for Gunyah hypercalls

Message ID 20230304010632.2127470-4-quic_eberman@quicinc.com
State Superseded
Headers show
Series Drivers for gunyah hypervisor | expand

Commit Message

Elliot Berman March 4, 2023, 1:06 a.m. UTC 
Add architecture-independent standard error codes, types, and macros for
Gunyah hypercalls.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>
---
 include/linux/gunyah.h | 83 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 include/linux/gunyah.h

Comments

Srinivas Kandagatla March 21, 2023, 2:23 p.m. UTC | #1 
On 04/03/2023 01:06, Elliot Berman wrote:
> Add architecture-independent standard error codes, types, and macros for
> Gunyah hypercalls.
> 
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>
> ---

Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>

>   include/linux/gunyah.h | 83 ++++++++++++++++++++++++++++++++++++++++++
>   1 file changed, 83 insertions(+)
>   create mode 100644 include/linux/gunyah.h
> 
> diff --git a/include/linux/gunyah.h b/include/linux/gunyah.h
> new file mode 100644
> index 000000000000..54b4be71caf7
> --- /dev/null
> +++ b/include/linux/gunyah.h
> @@ -0,0 +1,83 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#ifndef _LINUX_GUNYAH_H
> +#define _LINUX_GUNYAH_H
> +
> +#include <linux/errno.h>
> +#include <linux/limits.h>
> +
> +/******************************************************************************/
> +/* Common arch-independent definitions for Gunyah hypercalls                  */
> +#define GH_CAPID_INVAL	U64_MAX
> +#define GH_VMID_ROOT_VM	0xff
> +
> +enum gh_error {
> +	GH_ERROR_OK			= 0,
> +	GH_ERROR_UNIMPLEMENTED		= -1,
> +	GH_ERROR_RETRY			= -2,
> +
> +	GH_ERROR_ARG_INVAL		= 1,
> +	GH_ERROR_ARG_SIZE		= 2,
> +	GH_ERROR_ARG_ALIGN		= 3,
> +
> +	GH_ERROR_NOMEM			= 10,
> +
> +	GH_ERROR_ADDR_OVFL		= 20,
> +	GH_ERROR_ADDR_UNFL		= 21,
> +	GH_ERROR_ADDR_INVAL		= 22,
> +
> +	GH_ERROR_DENIED			= 30,
> +	GH_ERROR_BUSY			= 31,
> +	GH_ERROR_IDLE			= 32,
> +
> +	GH_ERROR_IRQ_BOUND		= 40,
> +	GH_ERROR_IRQ_UNBOUND		= 41,
> +
> +	GH_ERROR_CSPACE_CAP_NULL	= 50,
> +	GH_ERROR_CSPACE_CAP_REVOKED	= 51,
> +	GH_ERROR_CSPACE_WRONG_OBJ_TYPE	= 52,
> +	GH_ERROR_CSPACE_INSUF_RIGHTS	= 53,
> +	GH_ERROR_CSPACE_FULL		= 54,
> +
> +	GH_ERROR_MSGQUEUE_EMPTY		= 60,
> +	GH_ERROR_MSGQUEUE_FULL		= 61,
> +};
> +
> +/**
> + * gh_remap_error() - Remap Gunyah hypervisor errors into a Linux error code
> + * @gh_error: Gunyah hypercall return value
> + */
> +static inline int gh_remap_error(enum gh_error gh_error)
> +{
> +	switch (gh_error) {
> +	case GH_ERROR_OK:
> +		return 0;
> +	case GH_ERROR_NOMEM:
> +		return -ENOMEM;
> +	case GH_ERROR_DENIED:
> +	case GH_ERROR_CSPACE_CAP_NULL:
> +	case GH_ERROR_CSPACE_CAP_REVOKED:
> +	case GH_ERROR_CSPACE_WRONG_OBJ_TYPE:
> +	case GH_ERROR_CSPACE_INSUF_RIGHTS:
> +	case GH_ERROR_CSPACE_FULL:
> +		return -EACCES;
> +	case GH_ERROR_BUSY:
> +	case GH_ERROR_IDLE:
> +		return -EBUSY;
> +	case GH_ERROR_IRQ_BOUND:
> +	case GH_ERROR_IRQ_UNBOUND:
> +	case GH_ERROR_MSGQUEUE_FULL:
> +	case GH_ERROR_MSGQUEUE_EMPTY:
> +		return -EIO;
> +	case GH_ERROR_UNIMPLEMENTED:
> +	case GH_ERROR_RETRY:
> +		return -EOPNOTSUPP;
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +#endif
Alex Elder March 31, 2023, 2:24 p.m. UTC | #2 
On 3/3/23 7:06 PM, Elliot Berman wrote:
> Add architecture-independent standard error codes, types, and macros for
> Gunyah hypercalls.
> 
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>

See a few comments below.	-Alex

> ---
>   include/linux/gunyah.h | 83 ++++++++++++++++++++++++++++++++++++++++++
>   1 file changed, 83 insertions(+)
>   create mode 100644 include/linux/gunyah.h
> 
> diff --git a/include/linux/gunyah.h b/include/linux/gunyah.h
> new file mode 100644
> index 000000000000..54b4be71caf7
> --- /dev/null
> +++ b/include/linux/gunyah.h
> @@ -0,0 +1,83 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#ifndef _LINUX_GUNYAH_H
> +#define _LINUX_GUNYAH_H
> +
> +#include <linux/errno.h>
> +#include <linux/limits.h>
> +
> +/******************************************************************************/
> +/* Common arch-independent definitions for Gunyah hypercalls                  */
> +#define GH_CAPID_INVAL	U64_MAX
> +#define GH_VMID_ROOT_VM	0xff

The above definition doesn't seem to be used anywhere, but seeing
it begs the question to me of what type it is expected to have.
If it were used, where would it be used in an 8 bit field?

> +
> +enum gh_error {
> +	GH_ERROR_OK			= 0,
> +	GH_ERROR_UNIMPLEMENTED		= -1,
> +	GH_ERROR_RETRY			= -2,

There might be nothing fundamentally wrong with this, but I
dislike seeing negative values assigned to enums.

These error values are returned from the hypervisor, and it
looks like they'll likely truncated from a 64-bit unsigned
value.  Are they *sent* from the hypervisor as 64-bit signed
values?  Or 32-bit signed values?  (In that case, the

I just wonder if you can use 0xffffffff or 0xffff for example
rather than -1, depending on the actual value that gets passed.

> +
> +	GH_ERROR_ARG_INVAL		= 1,
> +	GH_ERROR_ARG_SIZE		= 2,
> +	GH_ERROR_ARG_ALIGN		= 3,
> +
> +	GH_ERROR_NOMEM			= 10,
> +
> +	GH_ERROR_ADDR_OVFL		= 20,
> +	GH_ERROR_ADDR_UNFL		= 21,
> +	GH_ERROR_ADDR_INVAL		= 22,
> +
> +	GH_ERROR_DENIED			= 30,
> +	GH_ERROR_BUSY			= 31,
> +	GH_ERROR_IDLE			= 32,
> +
> +	GH_ERROR_IRQ_BOUND		= 40,
> +	GH_ERROR_IRQ_UNBOUND		= 41,
> +
> +	GH_ERROR_CSPACE_CAP_NULL	= 50,
> +	GH_ERROR_CSPACE_CAP_REVOKED	= 51,
> +	GH_ERROR_CSPACE_WRONG_OBJ_TYPE	= 52,
> +	GH_ERROR_CSPACE_INSUF_RIGHTS	= 53,
> +	GH_ERROR_CSPACE_FULL		= 54,
> +
> +	GH_ERROR_MSGQUEUE_EMPTY		= 60,
> +	GH_ERROR_MSGQUEUE_FULL		= 61,
> +};
> +
> +/**
> + * gh_remap_error() - Remap Gunyah hypervisor errors into a Linux error code
> + * @gh_error: Gunyah hypercall return value
> + */
> +static inline int gh_remap_error(enum gh_error gh_error)

Since you're remapping a gh_error, I would have named this
gh_error_remap().

> +{
> +	switch (gh_error) {
> +	case GH_ERROR_OK:
> +		return 0;
> +	case GH_ERROR_NOMEM:
> +		return -ENOMEM;
> +	case GH_ERROR_DENIED:
> +	case GH_ERROR_CSPACE_CAP_NULL:
> +	case GH_ERROR_CSPACE_CAP_REVOKED:
> +	case GH_ERROR_CSPACE_WRONG_OBJ_TYPE:
> +	case GH_ERROR_CSPACE_INSUF_RIGHTS:
> +	case GH_ERROR_CSPACE_FULL:
> +		return -EACCES;
> +	case GH_ERROR_BUSY:
> +	case GH_ERROR_IDLE:
> +		return -EBUSY;
> +	case GH_ERROR_IRQ_BOUND:
> +	case GH_ERROR_IRQ_UNBOUND:
> +	case GH_ERROR_MSGQUEUE_FULL:
> +	case GH_ERROR_MSGQUEUE_EMPTY:
> +		return -EIO;
> +	case GH_ERROR_UNIMPLEMENTED:
> +	case GH_ERROR_RETRY:
> +		return -EOPNOTSUPP;
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +#endif
Elliot Berman April 3, 2023, 7:44 p.m. UTC | #3 
On 3/31/2023 7:24 AM, Alex Elder wrote:
> On 3/3/23 7:06 PM, Elliot Berman wrote:
>> Add architecture-independent standard error codes, types, and macros for
>> Gunyah hypercalls.
>>
>> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
>> Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>
> 
> See a few comments below.    -Alex
> 
>> ---
>>   include/linux/gunyah.h | 83 ++++++++++++++++++++++++++++++++++++++++++
>>   1 file changed, 83 insertions(+)
>>   create mode 100644 include/linux/gunyah.h
>>
>> diff --git a/include/linux/gunyah.h b/include/linux/gunyah.h
>> new file mode 100644
>> index 000000000000..54b4be71caf7
>> --- /dev/null
>> +++ b/include/linux/gunyah.h
>> @@ -0,0 +1,83 @@
>> +/* SPDX-License-Identifier: GPL-2.0-only */
>> +/*
>> + * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All 
>> rights reserved.
>> + */
>> +
>> +#ifndef _LINUX_GUNYAH_H
>> +#define _LINUX_GUNYAH_H
>> +
>> +#include <linux/errno.h>
>> +#include <linux/limits.h>
>> +
>> +/******************************************************************************/
>> +/* Common arch-independent definitions for Gunyah 
>> hypercalls                  */
>> +#define GH_CAPID_INVAL    U64_MAX
>> +#define GH_VMID_ROOT_VM    0xff
> 
> The above definition doesn't seem to be used anywhere, but seeing
> it begs the question to me of what type it is expected to have.
> If it were used, where would it be used in an 8 bit field?
> 

VMIDs are u16, the root VM (Resource Manager) VMID is 0xff. I think this 
definition snuck in from the downstream code and is indeed not being 
needed/used anywhere. I'll remove it.

>> +
>> +enum gh_error {
>> +    GH_ERROR_OK            = 0,
>> +    GH_ERROR_UNIMPLEMENTED        = -1,
>> +    GH_ERROR_RETRY            = -2,
> 
> There might be nothing fundamentally wrong with this, but I
> dislike seeing negative values assigned to enums.
> 
> These error values are returned from the hypervisor, and it
> looks like they'll likely truncated from a 64-bit unsigned
> value.  Are they *sent* from the hypervisor as 64-bit signed
> values?  Or 32-bit signed values?  (In that case, the
> 
> I just wonder if you can use 0xffffffff or 0xffff for example
> rather than -1, depending on the actual value that gets passed.
> 

They are sent from the hypervisor as 64-bit signed values (it's filling 
a register). I think truncating should be OK because Gunyah wants to 
maintain capability with 32-bit architectures and we would not see an 
error number that truly requires more than 32 bits to represent.

>> +
>> +    GH_ERROR_ARG_INVAL        = 1,
>> +    GH_ERROR_ARG_SIZE        = 2,
>> +    GH_ERROR_ARG_ALIGN        = 3,
>> +
>> +    GH_ERROR_NOMEM            = 10,
>> +
>> +    GH_ERROR_ADDR_OVFL        = 20,
>> +    GH_ERROR_ADDR_UNFL        = 21,
>> +    GH_ERROR_ADDR_INVAL        = 22,
>> +
>> +    GH_ERROR_DENIED            = 30,
>> +    GH_ERROR_BUSY            = 31,
>> +    GH_ERROR_IDLE            = 32,
>> +
>> +    GH_ERROR_IRQ_BOUND        = 40,
>> +    GH_ERROR_IRQ_UNBOUND        = 41,
>> +
>> +    GH_ERROR_CSPACE_CAP_NULL    = 50,
>> +    GH_ERROR_CSPACE_CAP_REVOKED    = 51,
>> +    GH_ERROR_CSPACE_WRONG_OBJ_TYPE    = 52,
>> +    GH_ERROR_CSPACE_INSUF_RIGHTS    = 53,
>> +    GH_ERROR_CSPACE_FULL        = 54,
>> +
>> +    GH_ERROR_MSGQUEUE_EMPTY        = 60,
>> +    GH_ERROR_MSGQUEUE_FULL        = 61,
>> +};
>> +
>> +/**
>> + * gh_remap_error() - Remap Gunyah hypervisor errors into a Linux 
>> error code
>> + * @gh_error: Gunyah hypercall return value
>> + */
>> +static inline int gh_remap_error(enum gh_error gh_error)
> 
> Since you're remapping a gh_error, I would have named this
> gh_error_remap().
> 

Done.

>> +{
>> +    switch (gh_error) {
>> +    case GH_ERROR_OK:
>> +        return 0;
>> +    case GH_ERROR_NOMEM:
>> +        return -ENOMEM;
>> +    case GH_ERROR_DENIED:
>> +    case GH_ERROR_CSPACE_CAP_NULL:
>> +    case GH_ERROR_CSPACE_CAP_REVOKED:
>> +    case GH_ERROR_CSPACE_WRONG_OBJ_TYPE:
>> +    case GH_ERROR_CSPACE_INSUF_RIGHTS:
>> +    case GH_ERROR_CSPACE_FULL:
>> +        return -EACCES;
>> +    case GH_ERROR_BUSY:
>> +    case GH_ERROR_IDLE:
>> +        return -EBUSY;
>> +    case GH_ERROR_IRQ_BOUND:
>> +    case GH_ERROR_IRQ_UNBOUND:
>> +    case GH_ERROR_MSGQUEUE_FULL:
>> +    case GH_ERROR_MSGQUEUE_EMPTY:
>> +        return -EIO;
>> +    case GH_ERROR_UNIMPLEMENTED:
>> +    case GH_ERROR_RETRY:
>> +        return -EOPNOTSUPP;
>> +    default:
>> +        return -EINVAL;
>> +    }
>> +}
>> +
>> +#endif
>
diff mbox series

Patch

diff --git a/include/linux/gunyah.h b/include/linux/gunyah.h
new file mode 100644
index 000000000000..54b4be71caf7
--- /dev/null
+++ b/include/linux/gunyah.h
@@ -0,0 +1,83 @@ 
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#ifndef _LINUX_GUNYAH_H
+#define _LINUX_GUNYAH_H
+
+#include <linux/errno.h>
+#include <linux/limits.h>
+
+/******************************************************************************/
+/* Common arch-independent definitions for Gunyah hypercalls                  */
+#define GH_CAPID_INVAL	U64_MAX
+#define GH_VMID_ROOT_VM	0xff
+
+enum gh_error {
+	GH_ERROR_OK			= 0,
+	GH_ERROR_UNIMPLEMENTED		= -1,
+	GH_ERROR_RETRY			= -2,
+
+	GH_ERROR_ARG_INVAL		= 1,
+	GH_ERROR_ARG_SIZE		= 2,
+	GH_ERROR_ARG_ALIGN		= 3,
+
+	GH_ERROR_NOMEM			= 10,
+
+	GH_ERROR_ADDR_OVFL		= 20,
+	GH_ERROR_ADDR_UNFL		= 21,
+	GH_ERROR_ADDR_INVAL		= 22,
+
+	GH_ERROR_DENIED			= 30,
+	GH_ERROR_BUSY			= 31,
+	GH_ERROR_IDLE			= 32,
+
+	GH_ERROR_IRQ_BOUND		= 40,
+	GH_ERROR_IRQ_UNBOUND		= 41,
+
+	GH_ERROR_CSPACE_CAP_NULL	= 50,
+	GH_ERROR_CSPACE_CAP_REVOKED	= 51,
+	GH_ERROR_CSPACE_WRONG_OBJ_TYPE	= 52,
+	GH_ERROR_CSPACE_INSUF_RIGHTS	= 53,
+	GH_ERROR_CSPACE_FULL		= 54,
+
+	GH_ERROR_MSGQUEUE_EMPTY		= 60,
+	GH_ERROR_MSGQUEUE_FULL		= 61,
+};
+
+/**
+ * gh_remap_error() - Remap Gunyah hypervisor errors into a Linux error code
+ * @gh_error: Gunyah hypercall return value
+ */
+static inline int gh_remap_error(enum gh_error gh_error)
+{
+	switch (gh_error) {
+	case GH_ERROR_OK:
+		return 0;
+	case GH_ERROR_NOMEM:
+		return -ENOMEM;
+	case GH_ERROR_DENIED:
+	case GH_ERROR_CSPACE_CAP_NULL:
+	case GH_ERROR_CSPACE_CAP_REVOKED:
+	case GH_ERROR_CSPACE_WRONG_OBJ_TYPE:
+	case GH_ERROR_CSPACE_INSUF_RIGHTS:
+	case GH_ERROR_CSPACE_FULL:
+		return -EACCES;
+	case GH_ERROR_BUSY:
+	case GH_ERROR_IDLE:
+		return -EBUSY;
+	case GH_ERROR_IRQ_BOUND:
+	case GH_ERROR_IRQ_UNBOUND:
+	case GH_ERROR_MSGQUEUE_FULL:
+	case GH_ERROR_MSGQUEUE_EMPTY:
+		return -EIO;
+	case GH_ERROR_UNIMPLEMENTED:
+	case GH_ERROR_RETRY:
+		return -EOPNOTSUPP;
+	default:
+		return -EINVAL;
+	}
+}
+
+#endif