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dmaengine: idxd: expose IAA CAP register via sysfs knob

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Add IAA (IAX) capability mask sysfs attribute to expose to applications.
The mask provides application knowledge of what capabilities this IAA
device supports. This mask is available for IAA 2.0 device or later.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Co-developed-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Link: https://lore.kernel.org/r/20230303213732.3357494-3-fenghua.yu@intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Dave Jiang 2023-03-03 13:37:32 -08:00 committed by Vinod Koul
parent 34ca00662e
commit 9f0d99b327
5 changed files with 58 additions and 0 deletions
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8
Documentation/ABI/stable/sysfs-driver-dma-idxd
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@ -136,6 +136,14 @@ Description: The last executed device administrative command's status/error.
Also last configuration error overloaded.
Writing to it will clear the status.
What: /sys/bus/dsa/devices/dsa<m>/iaa_cap
Date: Sept 14, 2022
KernelVersion: 6.0.0
Contact: dmaengine@vger.kernel.org
Description: IAA (IAX) capability mask. Exported to user space for application
consumption. This attribute should only be visible on IAA devices
that are version 2 or later.
What: /sys/bus/dsa/devices/wq<m>.<n>/block_on_fault
Date: Oct 27, 2020
KernelVersion: 5.11.0

1
drivers/dma/idxd/idxd.h
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@ -232,6 +232,7 @@ struct idxd_hw {
union engine_cap_reg engine_cap;
struct opcap opcap;
u32 cmd_cap;
union iaa_cap_reg iaa_cap;
};
enum idxd_device_state {

4
drivers/dma/idxd/init.c
View File

@ -460,6 +460,10 @@ static void idxd_read_caps(struct idxd_device *idxd)
dev_dbg(dev, "opcap[%d]: %#llx\n", i, idxd->hw.opcap.bits[i]);
}
multi_u64_to_bmap(idxd->opcap_bmap, &idxd->hw.opcap.bits[0], 4);
/* read iaa cap */
if (idxd->data->type == IDXD_TYPE_IAX && idxd->hw.version >= DEVICE_VERSION_2)
idxd->hw.iaa_cap.bits = ioread64(idxd->reg_base + IDXD_IAACAP_OFFSET);
}
static struct idxd_device *idxd_alloc(struct pci_dev *pdev, struct idxd_driver_data *data)

21
drivers/dma/idxd/registers.h
View File

@ -276,6 +276,27 @@ union sw_err_reg {
u64 bits[4];
} __packed;
union iaa_cap_reg {
struct {
u64 dec_aecs_format_ver:1;
u64 drop_init_bits:1;
u64 chaining:1;
u64 force_array_output_mod:1;
u64 load_part_aecs:1;
u64 comp_early_abort:1;
u64 nested_comp:1;
u64 diction_comp:1;
u64 header_gen:1;
u64 crypto_gcm:1;
u64 crypto_cfb:1;
u64 crypto_xts:1;
u64 rsvd:52;
};
u64 bits;
} __packed;
#define IDXD_IAACAP_OFFSET 0x180
union msix_perm {
struct {
u32 rsvd:2;

24
drivers/dma/idxd/sysfs.c
View File

@ -1561,6 +1561,18 @@ static ssize_t cmd_status_store(struct device *dev, struct device_attribute *att
}
static DEVICE_ATTR_RW(cmd_status);
static ssize_t iaa_cap_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct idxd_device *idxd = confdev_to_idxd(dev);
if (idxd->hw.version < DEVICE_VERSION_2)
return -EOPNOTSUPP;
return sysfs_emit(buf, "%#llx\n", idxd->hw.iaa_cap.bits);
}
static DEVICE_ATTR_RO(iaa_cap);
static bool idxd_device_attr_max_batch_size_invisible(struct attribute *attr,
struct idxd_device *idxd)
{
@ -1583,6 +1595,14 @@ static bool idxd_device_attr_read_buffers_invisible(struct attribute *attr,
idxd->data->type == IDXD_TYPE_IAX;
}
static bool idxd_device_attr_iaa_cap_invisible(struct attribute *attr,
struct idxd_device *idxd)
{
return attr == &dev_attr_iaa_cap.attr &&
(idxd->data->type != IDXD_TYPE_IAX ||
idxd->hw.version < DEVICE_VERSION_2);
}
static umode_t idxd_device_attr_visible(struct kobject *kobj,
struct attribute *attr, int n)
{
@ -1595,6 +1615,9 @@ static umode_t idxd_device_attr_visible(struct kobject *kobj,
if (idxd_device_attr_read_buffers_invisible(attr, idxd))
return 0;
if (idxd_device_attr_iaa_cap_invisible(attr, idxd))
return 0;
return attr->mode;
}
@ -1620,6 +1643,7 @@ static struct attribute *idxd_device_attributes[] = {
&dev_attr_read_buffer_limit.attr,
&dev_attr_cdev_major.attr,
&dev_attr_cmd_status.attr,
&dev_attr_iaa_cap.attr,
NULL,
};