/**
* update_path() - Update the path with the bandwidth and clock values, as
* requested by the client.
*
* @curr: Current source node, as specified in the client vector (master)
* @pnode: The first-hop node on the path, stored in the internal client struct
* @req_clk: Requested clock value from the vector
* @req_bw: Requested bandwidth value from the vector
* @curr_clk: Current clock frequency
* @curr_bw: Currently allocated bandwidth
*
* This function updates the nodes on the path calculated using getpath(), with
* clock and bandwidth values. The sum of bandwidths, and the max of clock
* frequencies is calculated at each node on the path. Commit data to be sent
* to RPM for each master and slave is also calculated here.
*/
static int update_path(int curr, int pnode, uint64_t req_clk, uint64_t req_bw,
uint64_t curr_clk, uint64_t curr_bw, unsigned int ctx, unsigned int
cl_active_flag)
{
int index, ret = 0;
struct msm_bus_inode_info *info;
int next_pnode;
int64_t add_bw = req_bw - curr_bw;
uint64_t bwsum = 0;
uint64_t req_clk_hz, curr_clk_hz, bwsum_hz;
int *master_tiers;
struct msm_bus_fabric_device *fabdev = msm_bus_get_fabric_device
(GET_FABID(curr));
if (!fabdev) {
MSM_BUS_ERR("Bus device for bus ID: %d not found!\n",
GET_FABID(curr));
return -ENXIO;
}
MSM_BUS_DBG("args: %d %d %d %llu %llu %llu %llu %u\n",
curr, GET_NODE(pnode), GET_INDEX(pnode), req_clk, req_bw,
curr_clk, curr_bw, ctx);
index = GET_INDEX(pnode);
MSM_BUS_DBG("Client passed index :%d\n", index);
info = fabdev->algo->find_node(fabdev, curr);
if (!info) {
MSM_BUS_ERR("Cannot find node info!\n");
return -ENXIO;
}
#ifndef CONFIG_BW_LIMITER_FIX
/**
* If master supports dual configuration, check if
* the configuration needs to be changed based on
* incoming requests
*/
if (info->node_info->dual_conf)
fabdev->algo->config_master(fabdev, info,
req_clk, req_bw);
#endif
info->link_info.sel_bw = &info->link_info.bw[ctx];
info->link_info.sel_clk = &info->link_info.clk[ctx];
*info->link_info.sel_bw += add_bw;
info->pnode[index].sel_bw = &info->pnode[index].bw[ctx];
/**
* To select the right clock, AND the context with
* client active flag.
*/
info->pnode[index].sel_clk = &info->pnode[index].clk[ctx &
cl_active_flag];
*info->pnode[index].sel_bw += add_bw;
#ifdef CONFIG_BW_LIMITER_FIX
*info->pnode[index].sel_clk = req_clk;
/**
* If master supports dual configuration, check if
* the configuration needs to be changed based on
* incoming requests
*/
if (info->node_info->dual_conf) {
uint64_t node_maxib = 0;
node_maxib = get_node_maxib(info);
fabdev->algo->config_master(fabdev, info,
node_maxib, req_bw);
}
#endif
info->link_info.num_tiers = info->node_info->num_tiers;
info->link_info.tier = info->node_info->tier;
master_tiers = info->node_info->tier;
do {
struct msm_bus_inode_info *hop;
fabdev = msm_bus_get_fabric_device(GET_FABID(curr));
if (!fabdev) {
MSM_BUS_ERR("Fabric not found\n");
return -ENXIO;
}
MSM_BUS_DBG("id: %d\n", info->node_info->priv_id);
/* find next node and index */
next_pnode = info->pnode[index].next;
curr = GET_NODE(next_pnode);
index = GET_INDEX(next_pnode);
MSM_BUS_DBG("id:%d, next: %d\n", info->
node_info->priv_id, curr);
/* Get hop */
/* check if we are here as gateway, or does the hop belong to
* this fabric */
if (IS_NODE(curr))
hop = fabdev->algo->find_node(fabdev, curr);
else
hop = fabdev->algo->find_gw_node(fabdev, curr);
if (!hop) {
MSM_BUS_ERR("Null Info found for hop\n");
return -ENXIO;
}
hop->link_info.sel_bw = &hop->link_info.bw[ctx];
hop->link_info.sel_clk = &hop->link_info.clk[ctx];
*hop->link_info.sel_bw += add_bw;
hop->pnode[index].sel_bw = &hop->pnode[index].bw[ctx];
hop->pnode[index].sel_clk = &hop->pnode[index].clk[ctx &
cl_active_flag];
if (!hop->node_info->buswidth) {
MSM_BUS_WARN("No bus width found. Using default\n");
hop->node_info->buswidth = 8;
}
*hop->pnode[index].sel_clk = BW_TO_CLK_FREQ_HZ(hop->node_info->
buswidth, req_clk);
*hop->pnode[index].sel_bw += add_bw;
MSM_BUS_DBG("fabric: %d slave: %d, slave-width: %d info: %d\n",
fabdev->id, hop->node_info->priv_id, hop->node_info->
buswidth, info->node_info->priv_id);
/* Update Bandwidth */
fabdev->algo->update_bw(fabdev, hop, info, add_bw,
master_tiers, ctx);
bwsum = *hop->link_info.sel_bw;
/* Update Fabric clocks */
curr_clk_hz = BW_TO_CLK_FREQ_HZ(hop->node_info->buswidth,
curr_clk);
req_clk_hz = BW_TO_CLK_FREQ_HZ(hop->node_info->buswidth,
req_clk);
bwsum_hz = BW_TO_CLK_FREQ_HZ(hop->node_info->buswidth,
bwsum);
/* Account for multiple channels if any */
if (hop->node_info->num_sports > 1)
bwsum_hz = msm_bus_div64(hop->node_info->num_sports,
bwsum_hz);
MSM_BUS_DBG("AXI: Hop: %d, ports: %d, bwsum_hz: %llu\n",
hop->node_info->id, hop->node_info->num_sports,
bwsum_hz);
MSM_BUS_DBG("up-clk: curr_hz: %llu, req_hz: %llu, bw_hz %llu\n",
curr_clk, req_clk, bwsum_hz);
ret = fabdev->algo->update_clks(fabdev, hop, index,
curr_clk_hz, req_clk_hz, bwsum_hz, SEL_FAB_CLK,
ctx, cl_active_flag);
if (ret)
MSM_BUS_WARN("Failed to update clk\n");
info = hop;
} while (GET_NODE(info->pnode[index].next) != info->node_info->priv_id);
/* Update BW, clk after exiting the loop for the last one */
if (!info) {
MSM_BUS_ERR("Cannot find node info!\n");
return -ENXIO;
}
/* Update slave clocks */
ret = fabdev->algo->update_clks(fabdev, info, index, curr_clk_hz,
req_clk_hz, bwsum_hz, SEL_SLAVE_CLK, ctx, cl_active_flag);
if (ret)
MSM_BUS_ERR("Failed to update clk\n");
return ret;
}
static void compute_nr_limits(struct msm_bus_fabric_device *fabdev, int pnode)
{
uint64_t total_ib = 0;
int num_nr_lim = 0;
uint64_t avail_bw = 0;
struct msm_bus_inode_info *info[fabdev->num_nr_lim];
struct msm_bus_fabric *fabric = to_msm_bus_fabric(fabdev);
int i;
num_nr_lim = radix_tree_gang_lookup_tag(&fabric->fab_tree,
(void **)&info, fabric->fabdev.id, fabdev->num_nr_lim,
MASTER_NODE);
MSM_BUS_DBG("%s: Found %d NR LIM nodes", __func__, num_nr_lim);
for (i = 0; i < num_nr_lim; i++)
total_ib += get_node_maxib(info[i]);
avail_bw = get_avail_bw(fabdev);
MSM_BUS_DBG("\n %s: Avail BW %llu", __func__, avail_bw);
for (i = 0; i < num_nr_lim; i++) {
uint32_t node_pct = 0;
uint64_t new_lim_bw = 0;
uint64_t node_max_ib = 0;
uint32_t node_max_ib_kB = 0;
uint32_t total_ib_kB = 0;
uint64_t bw_node;
node_max_ib = get_node_maxib(info[i]);
node_max_ib_kB = msm_bus_div64(1024, node_max_ib);
total_ib_kB = msm_bus_div64(1024, total_ib);
node_pct = (node_max_ib_kB * 100) / total_ib_kB;
bw_node = node_pct * avail_bw;
new_lim_bw = msm_bus_div64(100, bw_node);
/*
* if limiter bw is more than the requested IB clip to
requested IB.
*/
if (new_lim_bw >= node_max_ib)
new_lim_bw = node_max_ib;
/*
* if there is a floor bw for this nr lim node and
* if there is available bw to divy up among the nr masters
* and if the nr lim masters have a non zero vote and
* if the limited bw is below the floor for this node.
* then limit this node to the floor bw.
*/
if (info[i]->node_info->floor_bw && node_max_ib && avail_bw &&
(new_lim_bw <= info[i]->node_info->floor_bw)) {
MSM_BUS_ERR("\nNode %d:Limiting BW:%llu < floor:%llu",
info[i]->node_info->id, new_lim_bw,
info[i]->node_info->floor_bw);
new_lim_bw = info[i]->node_info->floor_bw;
}
if (new_lim_bw != info[i]->cur_lim_bw) {
info[i]->cur_lim_bw = new_lim_bw;
MSM_BUS_DBG("NodeId %d: Requested IB %llu",
info[i]->node_info->id, node_max_ib);
MSM_BUS_DBG("Limited to %llu(%d pct of Avail %llu )\n",
new_lim_bw, node_pct, avail_bw);
} else {
MSM_BUS_DBG("NodeId %d: No change Limited to %llu\n",
info[i]->node_info->id, info[i]->cur_lim_bw);
}
}
}