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SubjectRe: [PATCH 1/7] ocxl: Provide global MMIO accessors for external drivers
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On 13/3/19 3:15 pm, Alastair D'Silva wrote:
> From: Alastair D'Silva <alastair@d-silva.org>
>
> External drivers that communicate via OpenCAPI will need to make
> MMIO calls to interact with the devices.
>
> Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
> Reviewed-by: Greg Kurz <groug@kaod.org>

Acked-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>

> ---
> drivers/misc/ocxl/Makefile | 2 +-
> drivers/misc/ocxl/mmio.c | 234 +++++++++++++++++++++++++++++++++++++
> include/misc/ocxl.h | 113 ++++++++++++++++++
> 3 files changed, 348 insertions(+), 1 deletion(-)
> create mode 100644 drivers/misc/ocxl/mmio.c
>
> diff --git a/drivers/misc/ocxl/Makefile b/drivers/misc/ocxl/Makefile
> index 5229dcda8297..922e47cd4f0d 100644
> --- a/drivers/misc/ocxl/Makefile
> +++ b/drivers/misc/ocxl/Makefile
> @@ -1,7 +1,7 @@
> # SPDX-License-Identifier: GPL-2.0+
> ccflags-$(CONFIG_PPC_WERROR) += -Werror
>
> -ocxl-y += main.o pci.o config.o file.o pasid.o
> +ocxl-y += main.o pci.o config.o file.o pasid.o mmio.o
> ocxl-y += link.o context.o afu_irq.o sysfs.o trace.o
> obj-$(CONFIG_OCXL) += ocxl.o
>
> diff --git a/drivers/misc/ocxl/mmio.c b/drivers/misc/ocxl/mmio.c
> new file mode 100644
> index 000000000000..7f6ebae1c6c7
> --- /dev/null
> +++ b/drivers/misc/ocxl/mmio.c
> @@ -0,0 +1,234 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +// Copyright 2017 IBM Corp.
> +#include <linux/sched/mm.h>
> +#include "trace.h"
> +#include "ocxl_internal.h"
> +
> +int ocxl_global_mmio_read32(struct ocxl_afu *afu, size_t offset,
> + enum ocxl_endian endian, u32 *val)
> +{
> + if (offset > afu->config.global_mmio_size - 4)
> + return -EINVAL;
> +
> +#ifdef __BIG_ENDIAN__
> + if (endian == OCXL_HOST_ENDIAN)
> + endian = OCXL_BIG_ENDIAN;
> +#endif
> +
> + switch (endian) {
> + case OCXL_BIG_ENDIAN:
> + *val = readl_be((char *)afu->global_mmio_ptr + offset);
> + break;
> +
> + default:
> + *val = readl((char *)afu->global_mmio_ptr + offset);
> + break;
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(ocxl_global_mmio_read32);
> +
> +int ocxl_global_mmio_read64(struct ocxl_afu *afu, size_t offset,
> + enum ocxl_endian endian, u64 *val)
> +{
> + if (offset > afu->config.global_mmio_size - 8)
> + return -EINVAL;
> +
> +#ifdef __BIG_ENDIAN__
> + if (endian == OCXL_HOST_ENDIAN)
> + endian = OCXL_BIG_ENDIAN;
> +#endif
> +
> + switch (endian) {
> + case OCXL_BIG_ENDIAN:
> + *val = readq_be((char *)afu->global_mmio_ptr + offset);
> + break;
> +
> + default:
> + *val = readq((char *)afu->global_mmio_ptr + offset);
> + break;
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(ocxl_global_mmio_read64);
> +
> +int ocxl_global_mmio_write32(struct ocxl_afu *afu, size_t offset,
> + enum ocxl_endian endian, u32 val)
> +{
> + if (offset > afu->config.global_mmio_size - 4)
> + return -EINVAL;
> +
> +#ifdef __BIG_ENDIAN__
> + if (endian == OCXL_HOST_ENDIAN)
> + endian = OCXL_BIG_ENDIAN;
> +#endif
> +
> + switch (endian) {
> + case OCXL_BIG_ENDIAN:
> + writel_be(val, (char *)afu->global_mmio_ptr + offset);
> + break;
> +
> + default:
> + writel(val, (char *)afu->global_mmio_ptr + offset);
> + break;
> + }
> +
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(ocxl_global_mmio_write32);
> +
> +int ocxl_global_mmio_write64(struct ocxl_afu *afu, size_t offset,
> + enum ocxl_endian endian, u64 val)
> +{
> + if (offset > afu->config.global_mmio_size - 8)
> + return -EINVAL;
> +
> +#ifdef __BIG_ENDIAN__
> + if (endian == OCXL_HOST_ENDIAN)
> + endian = OCXL_BIG_ENDIAN;
> +#endif
> +
> + switch (endian) {
> + case OCXL_BIG_ENDIAN:
> + writeq_be(val, (char *)afu->global_mmio_ptr + offset);
> + break;
> +
> + default:
> + writeq(val, (char *)afu->global_mmio_ptr + offset);
> + break;
> + }
> +
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(ocxl_global_mmio_write64);
> +
> +int ocxl_global_mmio_set32(struct ocxl_afu *afu, size_t offset,
> + enum ocxl_endian endian, u32 mask)
> +{
> + u32 tmp;
> +
> + if (offset > afu->config.global_mmio_size - 4)
> + return -EINVAL;
> +
> +#ifdef __BIG_ENDIAN__
> + if (endian == OCXL_HOST_ENDIAN)
> + endian = OCXL_BIG_ENDIAN;
> +#endif
> +
> + switch (endian) {
> + case OCXL_BIG_ENDIAN:
> + tmp = readl_be((char *)afu->global_mmio_ptr + offset);
> + tmp |= mask;
> + writel_be(tmp, (char *)afu->global_mmio_ptr + offset);
> + break;
> +
> + default:
> + tmp = readl((char *)afu->global_mmio_ptr + offset);
> + tmp |= mask;
> + writel(tmp, (char *)afu->global_mmio_ptr + offset);
> + break;
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(ocxl_global_mmio_set32);
> +
> +int ocxl_global_mmio_set64(struct ocxl_afu *afu, size_t offset,
> + enum ocxl_endian endian, u64 mask)
> +{
> + u64 tmp;
> +
> + if (offset > afu->config.global_mmio_size - 8)
> + return -EINVAL;
> +
> +#ifdef __BIG_ENDIAN__
> + if (endian == OCXL_HOST_ENDIAN)
> + endian = OCXL_BIG_ENDIAN;
> +#endif
> +
> + switch (endian) {
> + case OCXL_BIG_ENDIAN:
> + tmp = readq_be((char *)afu->global_mmio_ptr + offset);
> + tmp |= mask;
> + writeq_be(tmp, (char *)afu->global_mmio_ptr + offset);
> + break;
> +
> + default:
> + tmp = readq((char *)afu->global_mmio_ptr + offset);
> + tmp |= mask;
> + writeq(tmp, (char *)afu->global_mmio_ptr + offset);
> + break;
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(ocxl_global_mmio_set64);
> +
> +int ocxl_global_mmio_clear32(struct ocxl_afu *afu, size_t offset,
> + enum ocxl_endian endian, u32 mask)
> +{
> + u32 tmp;
> +
> + if (offset > afu->config.global_mmio_size - 4)
> + return -EINVAL;
> +
> +#ifdef __BIG_ENDIAN__
> + if (endian == OCXL_HOST_ENDIAN)
> + endian = OCXL_BIG_ENDIAN;
> +#endif
> +
> + switch (endian) {
> + case OCXL_BIG_ENDIAN:
> + tmp = readl_be((char *)afu->global_mmio_ptr + offset);
> + tmp &= ~mask;
> + writel_be(tmp, (char *)afu->global_mmio_ptr + offset);
> + break;
> +
> + default:
> + tmp = readl((char *)afu->global_mmio_ptr + offset);
> + tmp &= ~mask;
> + writel(tmp, (char *)afu->global_mmio_ptr + offset);
> + break;
> + }
> +
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(ocxl_global_mmio_clear32);
> +
> +int ocxl_global_mmio_clear64(struct ocxl_afu *afu, size_t offset,
> + enum ocxl_endian endian, u64 mask)
> +{
> + u64 tmp;
> +
> + if (offset > afu->config.global_mmio_size - 8)
> + return -EINVAL;
> +
> +#ifdef __BIG_ENDIAN__
> + if (endian == OCXL_HOST_ENDIAN)
> + endian = OCXL_BIG_ENDIAN;
> +#endif
> +
> + switch (endian) {
> + case OCXL_BIG_ENDIAN:
> + tmp = readq_be((char *)afu->global_mmio_ptr + offset);
> + tmp &= ~mask;
> + writeq_be(tmp, (char *)afu->global_mmio_ptr + offset);
> + break;
> +
> + default:
> + tmp = readq((char *)afu->global_mmio_ptr + offset);
> + tmp &= ~mask;
> + writeq(tmp, (char *)afu->global_mmio_ptr + offset);
> + break;
> + }
> +
> + writeq(tmp, (char *)afu->global_mmio_ptr + offset);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(ocxl_global_mmio_clear64);
> diff --git a/include/misc/ocxl.h b/include/misc/ocxl.h
> index 9530d3be1b30..3b320c39f0af 100644
> --- a/include/misc/ocxl.h
> +++ b/include/misc/ocxl.h
> @@ -49,6 +49,119 @@ struct ocxl_fn_config {
> s8 max_afu_index;
> };
>
> +// These are opaque outside the ocxl driver
> +struct ocxl_afu;
> +
> +enum ocxl_endian {
> + OCXL_BIG_ENDIAN = 0, /**< AFU data is big-endian */
> + OCXL_LITTLE_ENDIAN = 1, /**< AFU data is little-endian */
> + OCXL_HOST_ENDIAN = 2, /**< AFU data is the same endianness as the host */
> +};
> +
> +/**
> + * Read a 32 bit value from global MMIO
> + *
> + * @afu: The AFU
> + * @offset: The Offset from the start of MMIO
> + * @endian: the endianness that the MMIO data is in
> + * @val: returns the value
> + *
> + * Returns 0 for success, negative on error
> + */
> +int ocxl_global_mmio_read32(struct ocxl_afu *afu, size_t offset,
> + enum ocxl_endian endian, u32 *val);
> +
> +/**
> + * Read a 64 bit value from global MMIO
> + *
> + * @afu: The AFU
> + * @offset: The Offset from the start of MMIO
> + * @endian: the endianness that the MMIO data is in
> + * @val: returns the value
> + *
> + * Returns 0 for success, negative on error
> + */
> +int ocxl_global_mmio_read64(struct ocxl_afu *afu, size_t offset,
> + enum ocxl_endian endian, u64 *val);
> +
> +/**
> + * Write a 32 bit value to global MMIO
> + *
> + * @afu: The AFU
> + * @offset: The Offset from the start of MMIO
> + * @endian: the endianness that the MMIO data is in
> + * @val: The value to write
> + *
> + * Returns 0 for success, negative on error
> + */
> +int ocxl_global_mmio_write32(struct ocxl_afu *afu, size_t offset,
> + enum ocxl_endian endian, u32 val);
> +
> +/**
> + * Write a 64 bit value to global MMIO
> + *
> + * @afu: The AFU
> + * @offset: The Offset from the start of MMIO
> + * @endian: the endianness that the MMIO data is in
> + * @val: The value to write
> + *
> + * Returns 0 for success, negative on error
> + */
> +int ocxl_global_mmio_write64(struct ocxl_afu *afu, size_t offset,
> + enum ocxl_endian endian, u64 val);
> +
> +/**
> + * Set bits in a 32 bit global MMIO register
> + *
> + * @afu: The AFU
> + * @offset: The Offset from the start of MMIO
> + * @endian: the endianness that the MMIO data is in
> + * @mask: a mask of the bits to set
> + *
> + * Returns 0 for success, negative on error
> + */
> +int ocxl_global_mmio_set32(struct ocxl_afu *afu, size_t offset,
> + enum ocxl_endian endian, u32 mask);
> +
> +/**
> + * Set bits in a 64 bit global MMIO register
> + *
> + * @afu: The AFU
> + * @offset: The Offset from the start of MMIO
> + * @endian: the endianness that the MMIO data is in
> + * @mask: a mask of the bits to set
> + *
> + * Returns 0 for success, negative on error
> + */
> +int ocxl_global_mmio_set64(struct ocxl_afu *afu, size_t offset,
> + enum ocxl_endian endian, u64 mask);
> +
> +/**
> + * Set bits in a 32 bit global MMIO register
> + *
> + * @afu: The AFU
> + * @offset: The Offset from the start of MMIO
> + * @endian: the endianness that the MMIO data is in
> + * @mask: a mask of the bits to set
> + *
> + * Returns 0 for success, negative on error
> + */
> +int ocxl_global_mmio_clear32(struct ocxl_afu *afu, size_t offset,
> + enum ocxl_endian endian, u32 mask);
> +
> +/**
> + * Set bits in a 64 bit global MMIO register
> + *
> + * @afu: The AFU
> + * @offset: The Offset from the start of MMIO
> + * @endian: the endianness that the MMIO data is in
> + * @mask: a mask of the bits to set
> + *
> + * Returns 0 for success, negative on error
> + */
> +int ocxl_global_mmio_clear64(struct ocxl_afu *afu, size_t offset,
> + enum ocxl_endian endian, u64 mask);
> +
> /*
> * Read the configuration space of a function and fill in a
> * ocxl_fn_config structure with all the function details
>

--
Andrew Donnellan OzLabs, ADL Canberra
andrew.donnellan@au1.ibm.com IBM Australia Limited

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