habanalabs: add context and ASID modules
This patch adds two modules - ASID and context. Each user process that opens a device's file must have at least one context before it is able to "work" with the device. Each context has its own device address-space and contains information about its runtime state (its active command submissions). To have address-space separation between contexts, each context is assigned a unique ASID, which stands for "address-space id". Goya supports up to 1024 ASIDs. Currently, the driver doesn't support multiple contexts. Therefore, the user doesn't need to actively create a context. A "primary context" is created automatically when the user opens the device's file. Reviewed-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oded Gabbay
Greg Kroah-Hartman
Родитель
99b9d7b497
Коммит
0861e41de5
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@ -4,7 +4,7 @@
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obj-m := habanalabs.o
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habanalabs-y := habanalabs_drv.o device.o
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habanalabs-y := habanalabs_drv.o device.o context.o asid.o
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include $(src)/goya/Makefile
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habanalabs-y += $(HL_GOYA_FILES)
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@ -0,0 +1,57 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2016-2019 HabanaLabs, Ltd.
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* All Rights Reserved.
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*/
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#include "habanalabs.h"
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#include <linux/slab.h>
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int hl_asid_init(struct hl_device *hdev)
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{
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hdev->asid_bitmap = kcalloc(BITS_TO_LONGS(hdev->asic_prop.max_asid),
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sizeof(*hdev->asid_bitmap), GFP_KERNEL);
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if (!hdev->asid_bitmap)
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return -ENOMEM;
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mutex_init(&hdev->asid_mutex);
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/* ASID 0 is reserved for KMD */
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set_bit(0, hdev->asid_bitmap);
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return 0;
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}
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void hl_asid_fini(struct hl_device *hdev)
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{
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mutex_destroy(&hdev->asid_mutex);
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kfree(hdev->asid_bitmap);
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}
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unsigned long hl_asid_alloc(struct hl_device *hdev)
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{
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unsigned long found;
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mutex_lock(&hdev->asid_mutex);
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found = find_first_zero_bit(hdev->asid_bitmap,
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hdev->asic_prop.max_asid);
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if (found == hdev->asic_prop.max_asid)
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found = 0;
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else
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set_bit(found, hdev->asid_bitmap);
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mutex_unlock(&hdev->asid_mutex);
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return found;
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}
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void hl_asid_free(struct hl_device *hdev, unsigned long asid)
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{
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if (WARN((asid == 0 || asid >= hdev->asic_prop.max_asid),
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"Invalid ASID %lu", asid))
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return;
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clear_bit(asid, hdev->asid_bitmap);
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}
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@ -0,0 +1,154 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2016-2019 HabanaLabs, Ltd.
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* All Rights Reserved.
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*/
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#include "habanalabs.h"
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#include <linux/slab.h>
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static void hl_ctx_fini(struct hl_ctx *ctx)
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{
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struct hl_device *hdev = ctx->hdev;
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if (ctx->asid != HL_KERNEL_ASID_ID)
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hl_asid_free(hdev, ctx->asid);
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}
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void hl_ctx_do_release(struct kref *ref)
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{
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struct hl_ctx *ctx;
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ctx = container_of(ref, struct hl_ctx, refcount);
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dev_dbg(ctx->hdev->dev, "Now really releasing context %d\n", ctx->asid);
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hl_ctx_fini(ctx);
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if (ctx->hpriv)
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hl_hpriv_put(ctx->hpriv);
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kfree(ctx);
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}
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int hl_ctx_create(struct hl_device *hdev, struct hl_fpriv *hpriv)
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{
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struct hl_ctx_mgr *mgr = &hpriv->ctx_mgr;
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struct hl_ctx *ctx;
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int rc;
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ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
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if (!ctx) {
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rc = -ENOMEM;
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goto out_err;
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}
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rc = hl_ctx_init(hdev, ctx, false);
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if (rc)
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goto free_ctx;
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hl_hpriv_get(hpriv);
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ctx->hpriv = hpriv;
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/* TODO: remove for multiple contexts */
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hpriv->ctx = ctx;
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hdev->user_ctx = ctx;
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mutex_lock(&mgr->ctx_lock);
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rc = idr_alloc(&mgr->ctx_handles, ctx, 1, 0, GFP_KERNEL);
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mutex_unlock(&mgr->ctx_lock);
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if (rc < 0) {
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dev_err(hdev->dev, "Failed to allocate IDR for a new CTX\n");
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hl_ctx_free(hdev, ctx);
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goto out_err;
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}
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return 0;
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free_ctx:
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kfree(ctx);
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out_err:
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return rc;
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}
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void hl_ctx_free(struct hl_device *hdev, struct hl_ctx *ctx)
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{
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if (kref_put(&ctx->refcount, hl_ctx_do_release) == 1)
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return;
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dev_warn(hdev->dev,
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"Context %d closed or terminated but its CS are executing\n",
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ctx->asid);
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}
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int hl_ctx_init(struct hl_device *hdev, struct hl_ctx *ctx, bool is_kernel_ctx)
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{
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ctx->hdev = hdev;
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kref_init(&ctx->refcount);
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if (is_kernel_ctx) {
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ctx->asid = HL_KERNEL_ASID_ID; /* KMD gets ASID 0 */
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} else {
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ctx->asid = hl_asid_alloc(hdev);
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if (!ctx->asid) {
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dev_err(hdev->dev, "No free ASID, failed to create context\n");
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return -ENOMEM;
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}
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}
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dev_dbg(hdev->dev, "Created context with ASID %u\n", ctx->asid);
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return 0;
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}
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void hl_ctx_get(struct hl_device *hdev, struct hl_ctx *ctx)
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{
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kref_get(&ctx->refcount);
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}
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int hl_ctx_put(struct hl_ctx *ctx)
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{
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return kref_put(&ctx->refcount, hl_ctx_do_release);
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}
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/*
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* hl_ctx_mgr_init - initialize the context manager
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*
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* @mgr: pointer to context manager structure
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*
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* This manager is an object inside the hpriv object of the user process.
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* The function is called when a user process opens the FD.
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*/
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void hl_ctx_mgr_init(struct hl_ctx_mgr *mgr)
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{
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mutex_init(&mgr->ctx_lock);
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idr_init(&mgr->ctx_handles);
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}
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/*
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* hl_ctx_mgr_fini - finalize the context manager
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*
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* @hdev: pointer to device structure
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* @mgr: pointer to context manager structure
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*
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* This function goes over all the contexts in the manager and frees them.
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* It is called when a process closes the FD.
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*/
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void hl_ctx_mgr_fini(struct hl_device *hdev, struct hl_ctx_mgr *mgr)
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{
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struct hl_ctx *ctx;
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struct idr *idp;
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u32 id;
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idp = &mgr->ctx_handles;
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idr_for_each_entry(idp, ctx, id)
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hl_ctx_free(hdev, ctx);
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idr_destroy(&mgr->ctx_handles);
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mutex_destroy(&mgr->ctx_lock);
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}
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@ -22,6 +22,12 @@ static void hpriv_release(struct kref *ref)
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put_pid(hpriv->taskpid);
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kfree(hpriv);
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/* Now the FD is really closed */
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atomic_dec(&hdev->fd_open_cnt);
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/* This allows a new user context to open the device */
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hdev->user_ctx = NULL;
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}
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void hl_hpriv_get(struct hl_fpriv *hpriv)
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@ -46,6 +52,8 @@ static int hl_device_release(struct inode *inode, struct file *filp)
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{
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struct hl_fpriv *hpriv = filp->private_data;
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hl_ctx_mgr_fini(hpriv->hdev, &hpriv->ctx_mgr);
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filp->private_data = NULL;
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hl_hpriv_put(hpriv);
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@ -137,7 +145,20 @@ static int device_early_init(struct hl_device *hdev)
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if (rc)
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return rc;
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rc = hl_asid_init(hdev);
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if (rc)
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goto early_fini;
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mutex_init(&hdev->fd_open_cnt_lock);
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atomic_set(&hdev->fd_open_cnt, 0);
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return 0;
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early_fini:
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if (hdev->asic_funcs->early_fini)
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hdev->asic_funcs->early_fini(hdev);
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return rc;
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}
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/*
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@ -149,9 +170,12 @@ static int device_early_init(struct hl_device *hdev)
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static void device_early_fini(struct hl_device *hdev)
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{
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hl_asid_fini(hdev);
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if (hdev->asic_funcs->early_fini)
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hdev->asic_funcs->early_fini(hdev);
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mutex_destroy(&hdev->fd_open_cnt_lock);
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}
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/*
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@ -245,11 +269,30 @@ int hl_device_init(struct hl_device *hdev, struct class *hclass)
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if (rc)
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goto early_fini;
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/* Allocate the kernel context */
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hdev->kernel_ctx = kzalloc(sizeof(*hdev->kernel_ctx), GFP_KERNEL);
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if (!hdev->kernel_ctx) {
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rc = -ENOMEM;
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goto sw_fini;
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}
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hdev->user_ctx = NULL;
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rc = hl_ctx_init(hdev, hdev->kernel_ctx, true);
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if (rc) {
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dev_err(hdev->dev, "failed to initialize kernel context\n");
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goto free_ctx;
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}
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dev_notice(hdev->dev,
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"Successfully added device to habanalabs driver\n");
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return 0;
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free_ctx:
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kfree(hdev->kernel_ctx);
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sw_fini:
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hdev->asic_funcs->sw_fini(hdev);
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early_fini:
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device_early_fini(hdev);
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release_device:
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@ -282,6 +325,10 @@ void hl_device_fini(struct hl_device *hdev)
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/* Mark device as disabled */
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hdev->disabled = true;
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/* Release kernel context */
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if ((hdev->kernel_ctx) && (hl_ctx_put(hdev->kernel_ctx) != 1))
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dev_err(hdev->dev, "kernel ctx is still alive\n");
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/* Call ASIC S/W finalize function */
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hdev->asic_funcs->sw_fini(hdev);
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@ -70,6 +70,8 @@ struct asic_fixed_properties {
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#define HL_QUEUE_LENGTH 256
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/*
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* ASICs
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*/
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@ -117,6 +119,39 @@ struct hl_asic_funcs {
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void *cpu_addr, dma_addr_t dma_handle);
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};
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/*
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* CONTEXTS
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*/
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#define HL_KERNEL_ASID_ID 0
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/**
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* struct hl_ctx - user/kernel context.
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* @hpriv: pointer to the private (KMD) data of the process (fd).
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* @hdev: pointer to the device structure.
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* @refcount: reference counter for the context. Context is released only when
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* this hits 0l. It is incremented on CS and CS_WAIT.
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* @asid: context's unique address space ID in the device's MMU.
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*/
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struct hl_ctx {
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struct hl_fpriv *hpriv;
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struct hl_device *hdev;
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struct kref refcount;
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u32 asid;
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};
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/**
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* struct hl_ctx_mgr - for handling multiple contexts.
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* @ctx_lock: protects ctx_handles.
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* @ctx_handles: idr to hold all ctx handles.
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*/
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struct hl_ctx_mgr {
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struct mutex ctx_lock;
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struct idr ctx_handles;
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};
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/*
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* FILE PRIVATE STRUCTURE
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*/
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@ -126,12 +161,16 @@ struct hl_asic_funcs {
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* @hdev: habanalabs device structure.
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* @filp: pointer to the given file structure.
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* @taskpid: current process ID.
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* @ctx: current executing context.
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* @ctx_mgr: context manager to handle multiple context for this FD.
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* @refcount: number of related contexts.
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*/
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struct hl_fpriv {
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struct hl_device *hdev;
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struct file *filp;
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struct pid *taskpid;
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struct hl_ctx *ctx; /* TODO: remove for multiple ctx */
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struct hl_ctx_mgr ctx_mgr;
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struct kref refcount;
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};
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@ -185,13 +224,24 @@ void hl_wreg(struct hl_device *hdev, u32 reg, u32 val);
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* @dev: realted kernel basic device structure.
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* @asic_name: ASIC specific nmae.
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* @asic_type: ASIC specific type.
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* @kernel_ctx: KMD context structure.
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* @dma_pool: DMA pool for small allocations.
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* @cpu_accessible_dma_mem: KMD <-> ArmCP shared memory CPU address.
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* @cpu_accessible_dma_address: KMD <-> ArmCP shared memory DMA address.
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* @cpu_accessible_dma_pool: KMD <-> ArmCP shared memory pool.
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* @asid_bitmap: holds used/available ASIDs.
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* @asid_mutex: protects asid_bitmap.
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* @fd_open_cnt_lock: lock for updating fd_open_cnt in hl_device_open. Although
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* fd_open_cnt is atomic, we need this lock to serialize
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* the open function because the driver currently supports
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* only a single process at a time. In addition, we need a
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* lock here so we can flush user processes which are opening
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* the device while we are trying to hard reset it
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* @asic_prop: ASIC specific immutable properties.
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* @asic_funcs: ASIC specific functions.
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* @asic_specific: ASIC specific information to use only from ASIC files.
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* @user_ctx: current user context executing.
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* @fd_open_cnt: number of open user processes.
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* @major: habanalabs KMD major.
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* @id: device minor.
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* @disabled: is device disabled.
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@ -204,13 +254,21 @@ struct hl_device {
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struct device *dev;
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char asic_name[16];
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enum hl_asic_type asic_type;
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struct hl_ctx *kernel_ctx;
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struct dma_pool *dma_pool;
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void *cpu_accessible_dma_mem;
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dma_addr_t cpu_accessible_dma_address;
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struct gen_pool *cpu_accessible_dma_pool;
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unsigned long *asid_bitmap;
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struct mutex asid_mutex;
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/* TODO: remove fd_open_cnt_lock for multiple process support */
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struct mutex fd_open_cnt_lock;
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struct asic_fixed_properties asic_prop;
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const struct hl_asic_funcs *asic_funcs;
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void *asic_specific;
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/* TODO: remove user_ctx for multiple process support */
|
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struct hl_ctx *user_ctx;
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atomic_t fd_open_cnt;
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u32 major;
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u16 id;
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u8 disabled;
|
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|
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@ -258,10 +316,23 @@ int hl_poll_timeout_memory(struct hl_device *hdev, u64 addr, u32 timeout_us,
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int hl_poll_timeout_device_memory(struct hl_device *hdev, void __iomem *addr,
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u32 timeout_us, u32 *val);
|
||||
|
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int hl_asid_init(struct hl_device *hdev);
|
||||
void hl_asid_fini(struct hl_device *hdev);
|
||||
unsigned long hl_asid_alloc(struct hl_device *hdev);
|
||||
void hl_asid_free(struct hl_device *hdev, unsigned long asid);
|
||||
|
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int hl_ctx_create(struct hl_device *hdev, struct hl_fpriv *hpriv);
|
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void hl_ctx_free(struct hl_device *hdev, struct hl_ctx *ctx);
|
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int hl_ctx_init(struct hl_device *hdev, struct hl_ctx *ctx, bool is_kernel_ctx);
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int hl_ctx_put(struct hl_ctx *ctx);
|
||||
void hl_ctx_mgr_init(struct hl_ctx_mgr *mgr);
|
||||
void hl_ctx_mgr_fini(struct hl_device *hdev, struct hl_ctx_mgr *mgr);
|
||||
int hl_device_init(struct hl_device *hdev, struct class *hclass);
|
||||
void hl_device_fini(struct hl_device *hdev);
|
||||
int hl_device_suspend(struct hl_device *hdev);
|
||||
int hl_device_resume(struct hl_device *hdev);
|
||||
void hl_hpriv_get(struct hl_fpriv *hpriv);
|
||||
void hl_hpriv_put(struct hl_fpriv *hpriv);
|
||||
|
||||
void goya_set_asic_funcs(struct hl_device *hdev);
|
||||
|
||||
|
|
|
|||
|
|
@ -70,6 +70,7 @@ int hl_device_open(struct inode *inode, struct file *filp)
|
|||
{
|
||||
struct hl_device *hdev;
|
||||
struct hl_fpriv *hpriv;
|
||||
int rc;
|
||||
|
||||
mutex_lock(&hl_devs_idr_lock);
|
||||
hdev = idr_find(&hl_devs_idr, iminor(inode));
|
||||
|
|
@ -81,9 +82,33 @@ int hl_device_open(struct inode *inode, struct file *filp)
|
|||
return -ENXIO;
|
||||
}
|
||||
|
||||
mutex_lock(&hdev->fd_open_cnt_lock);
|
||||
|
||||
if (hdev->disabled) {
|
||||
dev_err_ratelimited(hdev->dev,
|
||||
"Can't open %s because it is disabled\n",
|
||||
dev_name(hdev->dev));
|
||||
mutex_unlock(&hdev->fd_open_cnt_lock);
|
||||
return -EPERM;
|
||||
}
|
||||
|
||||
if (atomic_read(&hdev->fd_open_cnt)) {
|
||||
dev_info_ratelimited(hdev->dev,
|
||||
"Device %s is already attached to application\n",
|
||||
dev_name(hdev->dev));
|
||||
mutex_unlock(&hdev->fd_open_cnt_lock);
|
||||
return -EBUSY;
|
||||
}
|
||||
|
||||
atomic_inc(&hdev->fd_open_cnt);
|
||||
|
||||
mutex_unlock(&hdev->fd_open_cnt_lock);
|
||||
|
||||
hpriv = kzalloc(sizeof(*hpriv), GFP_KERNEL);
|
||||
if (!hpriv)
|
||||
return -ENOMEM;
|
||||
if (!hpriv) {
|
||||
rc = -ENOMEM;
|
||||
goto close_device;
|
||||
}
|
||||
|
||||
hpriv->hdev = hdev;
|
||||
filp->private_data = hpriv;
|
||||
|
|
@ -91,9 +116,26 @@ int hl_device_open(struct inode *inode, struct file *filp)
|
|||
kref_init(&hpriv->refcount);
|
||||
nonseekable_open(inode, filp);
|
||||
|
||||
hl_ctx_mgr_init(&hpriv->ctx_mgr);
|
||||
|
||||
rc = hl_ctx_create(hdev, hpriv);
|
||||
if (rc) {
|
||||
dev_err(hdev->dev, "Failed to open FD (CTX fail)\n");
|
||||
goto out_err;
|
||||
}
|
||||
|
||||
hpriv->taskpid = find_get_pid(current->pid);
|
||||
|
||||
return 0;
|
||||
|
||||
out_err:
|
||||
filp->private_data = NULL;
|
||||
hl_ctx_mgr_fini(hpriv->hdev, &hpriv->ctx_mgr);
|
||||
kfree(hpriv);
|
||||
|
||||
close_device:
|
||||
atomic_dec(&hdev->fd_open_cnt);
|
||||
return rc;
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
|
|||
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