The AI Engine consists of 2D array of tiles arranged as columns. The
resource solver provides the interfaces to manage allocation of the tile
columns for a hardware context. The basic column allocation and release
functions are provided.
Co-developed-by: Min Ma <min.ma@xxxxxxx>
Signed-off-by: Min Ma <min.ma@xxxxxxx>
Signed-off-by: Lizhi Hou <lizhi.hou@xxxxxxx>
---
drivers/accel/amdxdna/Makefile | 1 +
drivers/accel/amdxdna/aie2_pci.c | 23 +-
drivers/accel/amdxdna/aie2_solver.c | 329 ++++++++++++++++++++++++++++
drivers/accel/amdxdna/aie2_solver.h | 156 +++++++++++++
drivers/accel/amdxdna/amdxdna_drm.h | 1 +
5 files changed, 509 insertions(+), 1 deletion(-)
create mode 100644 drivers/accel/amdxdna/aie2_solver.c
create mode 100644 drivers/accel/amdxdna/aie2_solver.h
diff --git a/drivers/accel/amdxdna/Makefile b/drivers/accel/amdxdna/Makefile
index c21e6856057f..b44de7fe0c9e 100644
--- a/drivers/accel/amdxdna/Makefile
+++ b/drivers/accel/amdxdna/Makefile
@@ -5,6 +5,7 @@ amdxdna-y := \
aie2_pci.o \
aie2_psp.o \
aie2_smu.o \
+ aie2_solver.o \
amdxdna_drm.o \
amdxdna_mailbox.o \
amdxdna_mailbox_helper.o \
diff --git a/drivers/accel/amdxdna/aie2_pci.c b/drivers/accel/amdxdna/aie2_pci.c
index 4c3f1ce15340..7fd5e4497189 100644
--- a/drivers/accel/amdxdna/aie2_pci.c
+++ b/drivers/accel/amdxdna/aie2_pci.c
@@ -10,6 +10,11 @@
#include "aie2_msg_priv.h"
#include "aie2_pci.h"
+#include "aie2_solver.h"
+
+int aie2_max_col = XRS_MAX_COL;
+module_param(aie2_max_col, int, 0600);
+MODULE_PARM_DESC(aie2_max_col, "Maximum column could be used");
/*
* The management mailbox channel is allocated by firmware.
@@ -302,6 +307,7 @@ static int aie2_hw_start(struct amdxdna_dev *xdna)
static int aie2_init(struct amdxdna_dev *xdna)
{
struct pci_dev *pdev = to_pci_dev(xdna->ddev.dev);
+ struct init_config xrs_cfg = { 0 };
struct amdxdna_dev_hdl *ndev;
struct psp_config psp_conf;
const struct firmware *fw;
@@ -402,7 +408,22 @@ static int aie2_init(struct amdxdna_dev *xdna)
XDNA_ERR(xdna, "Query firmware failed, ret %d", ret);
goto stop_hw;
}
- ndev->total_col = ndev->metadata.cols;
+ ndev->total_col = min(aie2_max_col, ndev->metadata.cols);
+
+ xrs_cfg.clk_list.num_levels = 3;
+ xrs_cfg.clk_list.cu_clk_list[0] = 0;
+ xrs_cfg.clk_list.cu_clk_list[1] = 800;
+ xrs_cfg.clk_list.cu_clk_list[2] = 1000;
+ xrs_cfg.sys_eff_factor = 1;
+ xrs_cfg.dev = xdna->ddev.dev;
+ xrs_cfg.total_col = ndev->total_col;
+
+ xdna->xrs_hdl = xrsm_init(&xrs_cfg);
+ if (!xdna->xrs_hdl) {
+ XDNA_ERR(xdna, "Initialize resolver failed");
+ ret = -EINVAL;
+ goto stop_hw;
+ }
release_firmware(fw);
return 0;
diff --git a/drivers/accel/amdxdna/aie2_solver.c b/drivers/accel/amdxdna/aie2_solver.c
new file mode 100644
index 000000000000..0f55031937d0
--- /dev/null
+++ b/drivers/accel/amdxdna/aie2_solver.c
@@ -0,0 +1,329 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2022-2024, Advanced Micro Devices, Inc.
+ */
+
+#include <linux/slab.h>
+#include <linux/bitops.h>
+#include <linux/bitmap.h>
+#include <linux/device.h>
+
+#include "aie2_solver.h"
+
+struct partition_node {
+ struct list_head list;
+ u32 nshared; /* # shared requests */
+ u32 start_col; /* start column */
+ u32 ncols; /* # columns */
+ bool exclusive; /* can not be shared if set */
+};
+
+struct solver_node {
+ struct list_head list;
+ u64 rid; /* Request ID from consumer */
+
+ struct partition_node *pt_node;
+ void *cb_arg;
+ u32 cols_len;
+ u32 start_cols[] __counted_by(cols_len);
+};
+
+struct solver_rgroup {
+ u32 rgid;
+ u32 nnode;
+ u32 npartition_node;
+
+ DECLARE_BITMAP(resbit, XRS_MAX_COL);
+ struct list_head node_list;
+ struct list_head pt_node_list;
+};
+
+struct solver_state {
+ struct solver_rgroup rgp;
+ struct init_config cfg;
+ struct xrs_action_ops *actions;
+};
+
+static u32 calculate_gops(struct aie_qos *rqos)
+{
+ u32 service_rate = 0;
+
+ if (rqos->latency)
+ service_rate = (1000 / rqos->latency);
+
+ if (rqos->fps > service_rate)
+ return rqos->fps * rqos->gops;
+
+ return service_rate * rqos->gops;
+}
+
+/*
+ * qos_meet() - Check the QOS request can be met.
+ */
+static int qos_meet(struct solver_state *xrs, struct aie_qos *rqos, u32 cgops)
+{
+ u32 request_gops = calculate_gops(rqos) * xrs->cfg.sys_eff_factor;
+
+ if (request_gops <= cgops)
+ return 0;
+
+ return -EINVAL;
+}
+
+/*
+ * sanity_check() - Do a basic sanity check on allocation request.
+ */
+static int sanity_check(struct solver_state *xrs, struct alloc_requests *req)
+{
+ struct cdo_parts *cdop = &req->cdo;
+ struct aie_qos *rqos = &req->rqos;
+ u32 cu_clk_freq;
+
+ if (cdop->ncols > xrs->cfg.total_col)
+ return -EINVAL;
+
+ /*
+ * We can find at least one CDOs groups that meet the
+ * GOPs requirement.
+ */
+ cu_clk_freq = xrs->cfg.clk_list.cu_clk_list[xrs->cfg.clk_list.num_levels - 1];
+
+ if (qos_meet(xrs, rqos, cdop->qos_cap.opc * cu_clk_freq / 1000))
+ return -EINVAL;
+
+ return 0;
+}
+
+static struct solver_node *rg_search_node(struct solver_rgroup *rgp, u64 rid)
+{
+ struct solver_node *node;
+
+ list_for_each_entry(node, &rgp->node_list, list) {
+ if (node->rid == rid)
+ return node;
+ }
+
+ return NULL;
+}
+
+static void remove_partition_node(struct solver_rgroup *rgp,
+ struct partition_node *pt_node)
+{
+ pt_node->nshared--;
+ if (pt_node->nshared > 0)
+ return;
+
+ list_del(&pt_node->list);
+ rgp->npartition_node--;
+
+ bitmap_clear(rgp->resbit, pt_node->start_col, pt_node->ncols);
+ kfree(pt_node);
+}
+
+static void remove_solver_node(struct solver_rgroup *rgp,
+ struct solver_node *node)
+{
+ list_del(&node->list);
+ rgp->nnode--;
+
+ if (node->pt_node)
+ remove_partition_node(rgp, node->pt_node);
+
+ kfree(node);
+}
+
+static int get_free_partition(struct solver_state *xrs,
+ struct solver_node *snode,
+ struct alloc_requests *req)
+{
+ struct partition_node *pt_node;
+ u32 ncols = req->cdo.ncols;
+ u32 col, i;
+
+ for (i = 0; i < snode->cols_len; i++) {
+ col = snode->start_cols[i];
+ if (find_next_bit(xrs->rgp.resbit, XRS_MAX_COL, col) >= col + ncols)
+ break;
+ }
+
+ if (i == snode->cols_len)
+ return -ENODEV;
+
+ pt_node = kzalloc(sizeof(*pt_node), GFP_KERNEL);
+ if (!pt_node)
+ return -ENOMEM;
+
+ pt_node->nshared = 1;
+ pt_node->start_col = col;
+ pt_node->ncols = ncols;
+
+ /*
+ * Before fully support latency in QoS, if a request
+ * specifies a non-zero latency value, it will not share
+ * the partition with other requests.
+ */
+ if (req->rqos.latency)
+ pt_node->exclusive = true;
+
+ list_add_tail(&pt_node->list, &xrs->rgp.pt_node_list);
+ xrs->rgp.npartition_node++;
+ bitmap_set(xrs->rgp.resbit, pt_node->start_col, pt_node->ncols);
+
+ snode->pt_node = pt_node;
+
+ return 0;
+}
+
+static int allocate_partition(struct solver_state *xrs,
+ struct solver_node *snode,
+ struct alloc_requests *req)
+{
+ struct partition_node *pt_node, *rpt_node = NULL;
+ int idx, ret;
+
+ ret = get_free_partition(xrs, snode, req);
+ if (!ret)
+ return ret;
+
+ /* try to get a share-able partition */
+ list_for_each_entry(pt_node, &xrs->rgp.pt_node_list, list) {
+ if (pt_node->exclusive)
+ continue;
+
+ if (rpt_node && pt_node->nshared >= rpt_node->nshared)
+ continue;
+
+ for (idx = 0; idx < snode->cols_len; idx++) {
+ if (snode->start_cols[idx] != pt_node->start_col)
+ continue;
+
+ if (req->cdo.ncols != pt_node->ncols)
+ continue;
+
+ rpt_node = pt_node;
+ break;
+ }
+ }
+
+ if (!rpt_node)
+ return -ENODEV;
+
+ rpt_node->nshared++;
+ snode->pt_node = rpt_node;
+
+ return 0;
+}
+
+static struct solver_node *create_solver_node(struct solver_state *xrs,
+ struct alloc_requests *req)
+{
+ struct cdo_parts *cdop = &req->cdo;
+ struct solver_node *node;
+ int ret;
+
+ node = kzalloc(struct_size(node, start_cols, cdop->cols_len), GFP_KERNEL);
+ if (!node)
+ return ERR_PTR(-ENOMEM);
+
+ node->rid = req->rid;
+ node->cols_len = cdop->cols_len;
+ memcpy(node->start_cols, cdop->start_cols, cdop->cols_len * sizeof(u32));
+
+ ret = allocate_partition(xrs, node, req);
+ if (ret)
+ goto free_node;
+
+ list_add_tail(&node->list, &xrs->rgp.node_list);
+ xrs->rgp.nnode++;
+ return node;
+
+free_node:
+ kfree(node);
+ return ERR_PTR(ret);
+}
+
+static void fill_load_action(struct solver_state *xrs,
+ struct solver_node *snode,
+ struct xrs_action_load *action)
+{
+ action->rid = snode->rid;
+ action->part.start_col = snode->pt_node->start_col;
+ action->part.ncols = snode->pt_node->ncols;
+}
+
+int xrs_allocate_resource(void *hdl, struct alloc_requests *req, void *cb_arg)
+{
+ struct xrs_action_load load_act;
+ struct solver_node *snode;
+ struct solver_state *xrs;
+ int ret;
+
+ xrs = (struct solver_state *)hdl;
+
+ ret = sanity_check(xrs, req);
+ if (ret) {
+ dev_err(xrs->cfg.dev, "invalid request");
+ return ret;
+ }
+
+ if (rg_search_node(&xrs->rgp, req->rid)) {
+ dev_err(xrs->cfg.dev, "rid %lld is in-use", req->rid);
+ return -EEXIST;
+ }
+
+ snode = create_solver_node(xrs, req);
+ if (IS_ERR(snode))
+ return PTR_ERR(snode);
+
+ fill_load_action(xrs, snode, &load_act);
+ ret = xrs->cfg.actions->load(cb_arg, &load_act);
+ if (ret)
+ goto free_node;
+
+ snode->cb_arg = cb_arg;
+
+ dev_dbg(xrs->cfg.dev, "start col %d ncols %d\n",
+ snode->pt_node->start_col, snode->pt_node->ncols);
+
+ return 0;
+
+free_node:
+ remove_solver_node(&xrs->rgp, snode);
+
+ return ret;
+}
+
+int xrs_release_resource(void *hdl, u64 rid)
+{
+ struct solver_state *xrs = hdl;
+ struct solver_node *node;
+
+ node = rg_search_node(&xrs->rgp, rid);
+ if (!node) {
+ dev_err(xrs->cfg.dev, "node not exist");
+ return -ENODEV;
+ }
+
+ xrs->cfg.actions->unload(node->cb_arg);
+ remove_solver_node(&xrs->rgp, node);
+
+ return 0;
+}
+
+void *xrsm_init(struct init_config *cfg)
+{
+ struct solver_rgroup *rgp;
+ struct solver_state *xrs;
+
+ xrs = devm_kzalloc(cfg->dev, sizeof(*xrs), GFP_KERNEL);
+ if (!xrs)
+ return NULL;
+
+ memcpy(&xrs->cfg, cfg, sizeof(struct init_config));
+
+ rgp = &xrs->rgp;
+ INIT_LIST_HEAD(&rgp->node_list);
+ INIT_LIST_HEAD(&rgp->pt_node_list);
+
+ return xrs;
+}
diff --git a/drivers/accel/amdxdna/aie2_solver.h b/drivers/accel/amdxdna/aie2_solver.h
new file mode 100644
index 000000000000..7f328bbf4960
--- /dev/null
+++ b/drivers/accel/amdxdna/aie2_solver.h
@@ -0,0 +1,156 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2023-2024, Advanced Micro Devices, Inc.
+ */
+
+#ifndef _AIE2_SOLVER_H
+#define _AIE2_SOLVER_H
+
+#include <linux/types.h>
+
+#define XRS_MAX_COL 128
+
+/*
+ * Structure used to describe a partition. A partition is column based
+ * allocation unit described by its start column and number of columns.
+ */
+struct aie_part {
+ u32 start_col;
+ u32 ncols;
+};
+
+/*
+ * The QoS capabilities of a given AIE partition.
+ */
+struct aie_qos_cap {
+ u32 opc; /* operations per cycle */
+ u32 dma_bw; /* DMA bandwidth */
+};
+
+/*
+ * QoS requirement of a resource allocation.
+ */
+struct aie_qos {
+ u32 gops; /* Giga operations */
+ u32 fps; /* Frames per second */
+ u32 dma_bw; /* DMA bandwidth */
+ u32 latency; /* Frame response latency */
+ u32 exec_time; /* Frame execution time */
+ u32 priority; /* Request priority */
+};
+
+/*
+ * Structure used to describe a relocatable CDO (Configuration Data Object).
+ */
+struct cdo_parts {
+ u32 *start_cols; /* Start column array */
+ u32 cols_len; /* Length of start column array */
+ u32 ncols; /* # of column */
+ struct aie_qos_cap qos_cap; /* CDO QoS capabilities */
+};
+
+/*
+ * Structure used to describe a request to allocate.
+ */
+struct alloc_requests {
+ u64 rid;
+ struct cdo_parts cdo;
+ struct aie_qos rqos; /* Requested QoS */
+};
+
+/*
+ * Load callback argument
+ */
+struct xrs_action_load {
+ u32 rid;
+ struct aie_part part;
+};
+
+/*
+ * Define the power level available
+ *
+ * POWER_LEVEL_MIN:
+ * Lowest power level. Usually set when all actions are unloaded.
+ *
+ * POWER_LEVEL_n
+ * Power levels 0 - n, is a step increase in system frequencies
+ */
+enum power_level {
+ POWER_LEVEL_MIN = 0x0,
+ POWER_LEVEL_0 = 0x1,
+ POWER_LEVEL_1 = 0x2,
+ POWER_LEVEL_2 = 0x3,
+ POWER_LEVEL_3 = 0x4,
+ POWER_LEVEL_4 = 0x5,
+ POWER_LEVEL_5 = 0x6,
+ POWER_LEVEL_6 = 0x7,
+ POWER_LEVEL_7 = 0x8,
+ POWER_LEVEL_NUM,
+};
+
+/*
+ * Structure used to describe the frequency table.
+ * Resource solver chooses the frequency from the table
+ * to meet the QOS requirements.
+ */
+struct clk_list_info {
+ u32 num_levels; /* available power levels */
+ u32 cu_clk_list[POWER_LEVEL_NUM]; /* available aie clock frequencies in Mhz*/
+};
+
+struct xrs_action_ops {
+ int (*load)(void *cb_arg, struct xrs_action_load *action);
+ int (*unload)(void *cb_arg);
+};
+
+/*
+ * Structure used to describe information for solver during initialization.
+ */
+struct init_config {
+ u32 total_col;
+ u32 sys_eff_factor; /* system efficiency factor */
+ u32 latency_adj; /* latency adjustment in ms */
+ struct clk_list_info clk_list; /* List of frequencies available in system */
+ struct device *dev;
+ struct xrs_action_ops *actions;
+};
+
+/*
+ * xrsm_init() - Register resource solver. Resource solver client needs
+ * to call this function to register itself.
+ *
+ * @cfg: The system metrics for resource solver to use
+ *
+ * Return: A resource solver handle
+ *
+ * Note: We should only create one handle per AIE array to be managed.
+ */
+void *xrsm_init(struct init_config *cfg);
+
+/*
+ * xrs_allocate_resource() - Request to allocate resources for a given context
+ * and a partition metadata. (See struct part_meta)
+ *
+ * @hdl: Resource solver handle obtained from xrs_init()
+ * @req: Input to the Resource solver including request id
+ * and partition metadata.
+ * @cb_arg: callback argument pointer
+ *
+ * Return: 0 when successful.
+ * Or standard error number when failing
+ *
+ * Note:
+ * There is no lock mechanism inside resource solver. So it is
+ * the caller's responsibility to lock down XCLBINs and grab
+ * necessary lock.
+ */
+int xrs_allocate_resource(void *hdl, struct alloc_requests *req, void *cb_arg);
+
+/*
+ * xrs_release_resource() - Request to free resources for a given context.
+ *
+ * @hdl: Resource solver handle obtained from xrs_init()
+ * @rid: The Request ID to identify the requesting context
+ */
+int xrs_release_resource(void *hdl, u64 rid);
+#endif /* _AIE2_SOLVER_H */
diff --git a/drivers/accel/amdxdna/amdxdna_drm.h b/drivers/accel/amdxdna/amdxdna_drm.h
index 8a31bf552796..bf4b0b786606 100644
--- a/drivers/accel/amdxdna/amdxdna_drm.h
+++ b/drivers/accel/amdxdna/amdxdna_drm.h
@@ -65,6 +65,7 @@ struct amdxdna_dev {
struct drm_device ddev;
struct amdxdna_dev_hdl *dev_handle;
const struct amdxdna_dev_info *dev_info;
+ void *xrs_hdl;
struct mutex dev_lock; /* per device lock */
struct amdxdna_fw_ver fw_ver;
--
2.34.1
