remoteproc: pru: Add pru-specific debugfs support
The remoteproc core creates certain standard debugfs entries, that does not give a whole lot of useful information for the PRUs. The PRU remoteproc driver is enhanced to add additional debugfs entries for PRU. These will be auto-cleaned up when the parent rproc debug directory is removed. The enhanced debugfs support adds two new entries: 'regs' and 'single_step'. The 'regs' dumps out the useful CTRL sub-module registers as well as each of the 32 GPREGs and CT_REGs registers. The GPREGs and CT_REGs though are printed only when the PRU is halted and accessible as per the IP design. The 'single_step' utilizes the single-step execution of the PRU cores. Writing a non-zero value performs a single step, and a zero value restores the PRU to execute in the same mode as the mode before the first single step. (note: if the PRU is halted because of a halt instruction, then no change occurs). Logic for setting the PC and jumping over a halt instruction shall be added in the future. Signed-off-by: Suman Anna <s-anna@ti.com> Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20201208141002.17777-5-grzegorz.jaszczyk@linaro.org Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
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@ -11,6 +11,7 @@
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*/
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#include <linux/bitops.h>
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#include <linux/debugfs.h>
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#include <linux/irqdomain.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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@ -25,6 +26,13 @@
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/* PRU_ICSS_PRU_CTRL registers */
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#define PRU_CTRL_CTRL 0x0000
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#define PRU_CTRL_STS 0x0004
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#define PRU_CTRL_WAKEUP_EN 0x0008
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#define PRU_CTRL_CYCLE 0x000C
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#define PRU_CTRL_STALL 0x0010
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#define PRU_CTRL_CTBIR0 0x0020
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#define PRU_CTRL_CTBIR1 0x0024
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#define PRU_CTRL_CTPPR0 0x0028
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#define PRU_CTRL_CTPPR1 0x002C
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/* CTRL register bit-fields */
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#define CTRL_CTRL_SOFT_RST_N BIT(0)
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@ -34,6 +42,10 @@
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#define CTRL_CTRL_SINGLE_STEP BIT(8)
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#define CTRL_CTRL_RUNSTATE BIT(15)
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/* PRU_ICSS_PRU_DEBUG registers */
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#define PRU_DEBUG_GPREG(x) (0x0000 + (x) * 4)
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#define PRU_DEBUG_CT_REG(x) (0x0080 + (x) * 4)
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/* PRU Core IRAM address masks */
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#define PRU_IRAM_ADDR_MASK 0x3ffff
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#define PRU0_IRAM_ADDR_MASK 0x34000
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@ -73,6 +85,8 @@ enum pru_iomem {
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* @mapped_irq: virtual interrupt numbers of created fw specific mapping
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* @pru_interrupt_map: pointer to interrupt mapping description (firmware)
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* @pru_interrupt_map_sz: pru_interrupt_map size
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* @dbg_single_step: debug state variable to set PRU into single step mode
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* @dbg_continuous: debug state variable to restore PRU execution mode
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* @evt_count: number of mapped events
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*/
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struct pru_rproc {
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@ -85,6 +99,8 @@ struct pru_rproc {
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unsigned int *mapped_irq;
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struct pru_irq_rsc *pru_interrupt_map;
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size_t pru_interrupt_map_sz;
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u32 dbg_single_step;
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u32 dbg_continuous;
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u8 evt_count;
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};
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@ -99,6 +115,124 @@ void pru_control_write_reg(struct pru_rproc *pru, unsigned int reg, u32 val)
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writel_relaxed(val, pru->mem_regions[PRU_IOMEM_CTRL].va + reg);
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}
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static inline u32 pru_debug_read_reg(struct pru_rproc *pru, unsigned int reg)
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{
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return readl_relaxed(pru->mem_regions[PRU_IOMEM_DEBUG].va + reg);
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}
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static int regs_show(struct seq_file *s, void *data)
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{
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struct rproc *rproc = s->private;
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struct pru_rproc *pru = rproc->priv;
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int i, nregs = 32;
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u32 pru_sts;
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int pru_is_running;
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seq_puts(s, "============== Control Registers ==============\n");
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seq_printf(s, "CTRL := 0x%08x\n",
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pru_control_read_reg(pru, PRU_CTRL_CTRL));
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pru_sts = pru_control_read_reg(pru, PRU_CTRL_STS);
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seq_printf(s, "STS (PC) := 0x%08x (0x%08x)\n", pru_sts, pru_sts << 2);
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seq_printf(s, "WAKEUP_EN := 0x%08x\n",
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pru_control_read_reg(pru, PRU_CTRL_WAKEUP_EN));
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seq_printf(s, "CYCLE := 0x%08x\n",
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pru_control_read_reg(pru, PRU_CTRL_CYCLE));
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seq_printf(s, "STALL := 0x%08x\n",
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pru_control_read_reg(pru, PRU_CTRL_STALL));
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seq_printf(s, "CTBIR0 := 0x%08x\n",
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pru_control_read_reg(pru, PRU_CTRL_CTBIR0));
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seq_printf(s, "CTBIR1 := 0x%08x\n",
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pru_control_read_reg(pru, PRU_CTRL_CTBIR1));
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seq_printf(s, "CTPPR0 := 0x%08x\n",
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pru_control_read_reg(pru, PRU_CTRL_CTPPR0));
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seq_printf(s, "CTPPR1 := 0x%08x\n",
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pru_control_read_reg(pru, PRU_CTRL_CTPPR1));
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seq_puts(s, "=============== Debug Registers ===============\n");
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pru_is_running = pru_control_read_reg(pru, PRU_CTRL_CTRL) &
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CTRL_CTRL_RUNSTATE;
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if (pru_is_running) {
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seq_puts(s, "PRU is executing, cannot print/access debug registers.\n");
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return 0;
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}
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for (i = 0; i < nregs; i++) {
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seq_printf(s, "GPREG%-2d := 0x%08x\tCT_REG%-2d := 0x%08x\n",
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i, pru_debug_read_reg(pru, PRU_DEBUG_GPREG(i)),
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i, pru_debug_read_reg(pru, PRU_DEBUG_CT_REG(i)));
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}
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(regs);
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/*
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* Control PRU single-step mode
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*
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* This is a debug helper function used for controlling the single-step
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* mode of the PRU. The PRU Debug registers are not accessible when the
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* PRU is in RUNNING state.
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*
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* Writing a non-zero value sets the PRU into single-step mode irrespective
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* of its previous state. The PRU mode is saved only on the first set into
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* a single-step mode. Writing a zero value will restore the PRU into its
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* original mode.
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*/
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static int pru_rproc_debug_ss_set(void *data, u64 val)
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{
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struct rproc *rproc = data;
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struct pru_rproc *pru = rproc->priv;
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u32 reg_val;
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val = val ? 1 : 0;
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if (!val && !pru->dbg_single_step)
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return 0;
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reg_val = pru_control_read_reg(pru, PRU_CTRL_CTRL);
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if (val && !pru->dbg_single_step)
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pru->dbg_continuous = reg_val;
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if (val)
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reg_val |= CTRL_CTRL_SINGLE_STEP | CTRL_CTRL_EN;
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else
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reg_val = pru->dbg_continuous;
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pru->dbg_single_step = val;
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pru_control_write_reg(pru, PRU_CTRL_CTRL, reg_val);
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return 0;
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}
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static int pru_rproc_debug_ss_get(void *data, u64 *val)
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{
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struct rproc *rproc = data;
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struct pru_rproc *pru = rproc->priv;
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*val = pru->dbg_single_step;
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return 0;
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}
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DEFINE_SIMPLE_ATTRIBUTE(pru_rproc_debug_ss_fops, pru_rproc_debug_ss_get,
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pru_rproc_debug_ss_set, "%llu\n");
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/*
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* Create PRU-specific debugfs entries
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*
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* The entries are created only if the parent remoteproc debugfs directory
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* exists, and will be cleaned up by the remoteproc core.
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*/
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static void pru_rproc_create_debug_entries(struct rproc *rproc)
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{
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if (!rproc->dbg_dir)
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return;
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debugfs_create_file("regs", 0400, rproc->dbg_dir,
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rproc, ®s_fops);
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debugfs_create_file("single_step", 0600, rproc->dbg_dir,
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rproc, &pru_rproc_debug_ss_fops);
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}
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static void pru_dispose_irq_mapping(struct pru_rproc *pru)
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{
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while (pru->evt_count--) {
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@ -572,6 +706,8 @@ static int pru_rproc_probe(struct platform_device *pdev)
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return ret;
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}
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pru_rproc_create_debug_entries(rproc);
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dev_dbg(dev, "PRU rproc node %pOF probed successfully\n", np);
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return 0;
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