Messages in this thread Patch in this message |  | | From | Oded Gabbay <> | Subject | [PATCH] habanalabs: Add CB IOCTL opcode to retrieve CB information | Date | Sun, 29 Nov 2020 00:22:03 +0200 |
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From: Tomer Tayar <ttayar@habana.ai>
Add a new CB IOCTL opcode that enables a user to query about a CB and get its usage count.
Signed-off-by: Tomer Tayar <ttayar@habana.ai> Reviewed-by: Oded Gabbay <ogabbay@kernel.org> Signed-off-by: Oded Gabbay <ogabbay@kernel.org> --- .../misc/habanalabs/common/command_buffer.c | 38 +++++++++++++++++++ include/uapi/misc/habanalabs.h | 15 +++++++- 2 files changed, 51 insertions(+), 2 deletions(-)
diff --git a/drivers/misc/habanalabs/common/command_buffer.c b/drivers/misc/habanalabs/common/command_buffer.c index 2856bb3423ee..6f6a904ab6ca 100644 --- a/drivers/misc/habanalabs/common/command_buffer.c +++ b/drivers/misc/habanalabs/common/command_buffer.c @@ -375,12 +375,43 @@ int hl_cb_destroy(struct hl_device *hdev, struct hl_cb_mgr *mgr, u64 cb_handle) return rc; } +static int hl_cb_info(struct hl_device *hdev, struct hl_cb_mgr *mgr, + u64 cb_handle, u32 *usage_cnt) +{ + struct hl_cb *cb; + u32 handle; + int rc = 0; + + /* The CB handle was given to user to do mmap, so need to shift it back + * to the value which was allocated by the IDR module. + */ + cb_handle >>= PAGE_SHIFT; + handle = (u32) cb_handle; + + spin_lock(&mgr->cb_lock); + + cb = idr_find(&mgr->cb_handles, handle); + if (!cb) { + dev_err(hdev->dev, + "CB info failed, no match to handle 0x%x\n", handle); + rc = -EINVAL; + goto out; + } + + *usage_cnt = atomic_read(&cb->cs_cnt); + +out: + spin_unlock(&mgr->cb_lock); + return rc; +} + int hl_cb_ioctl(struct hl_fpriv *hpriv, void *data) { union hl_cb_args *args = data; struct hl_device *hdev = hpriv->hdev; enum hl_device_status status; u64 handle = 0; + u32 usage_cnt = 0; int rc; if (!hl_device_operational(hdev, &status)) { @@ -413,6 +444,13 @@ int hl_cb_ioctl(struct hl_fpriv *hpriv, void *data) args->in.cb_handle); break; + case HL_CB_OP_INFO: + rc = hl_cb_info(hdev, &hpriv->cb_mgr, args->in.cb_handle, + &usage_cnt); + memset(args, 0, sizeof(*args)); + args->out.usage_cnt = usage_cnt; + break; + default: rc = -ENOTTY; break; diff --git a/include/uapi/misc/habanalabs.h b/include/uapi/misc/habanalabs.h index 6eff4e05eccb..8c15a7d336a0 100644 --- a/include/uapi/misc/habanalabs.h +++ b/include/uapi/misc/habanalabs.h @@ -483,6 +483,8 @@ struct hl_info_args { #define HL_CB_OP_CREATE 0 /* Opcode to destroy previously created command buffer */ #define HL_CB_OP_DESTROY 1 +/* Opcode to retrieve information about a command buffer */ +#define HL_CB_OP_INFO 2 /* 2MB minus 32 bytes for 2xMSG_PROT */ #define HL_MAX_CB_SIZE (0x200000 - 32) @@ -506,8 +508,17 @@ struct hl_cb_in { }; struct hl_cb_out { - /* Handle of CB */ - __u64 cb_handle; + union { + /* Handle of CB */ + __u64 cb_handle; + + /* Information about CB */ + struct { + /* Usage count of CB */ + __u32 usage_cnt; + __u32 pad; + }; + }; }; union hl_cb_args { -- 2.17.1
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