Merge tag 'riscv-for-linus-5.8-mw0' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux

Pull RISC-V updates from Palmer Dabbelt:

 - The remainder of the code necessary to support the Kendryte K210:

     * Support for building device trees into the kernel, as the K210
       doesn't have a bootloader that provides one

     * A K210 device tree and the associated defconfig update

     * Support for skipping PMP initialization on systems that trap on
       PMP accesses rather than treating them as WARL

 - Support for KGDB

 - Improvements to text patching

 - Some cleanups to the SiFive L2 cache driver

* tag 'riscv-for-linus-5.8-mw0' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
  soc: sifive: l2 cache: Mark l2_get_priv_group as static
  soc: sifive: l2 cache: Eliminate an unsigned zero compare warning
  riscv: Add support to determine no. of L2 cache way enabled
  riscv: cacheinfo: Implement cache_get_priv_group with a generic ops structure
  riscv: Use text_mutex instead of patch_lock
  riscv: Use NOKPROBE_SYMBOL() instead of __krpobes annotation
  riscv: Remove the 'riscv_' prefix of function name
  riscv: Add SW single-step support for KDB
  riscv: Use the XML target descriptions to report 3 system registers
  riscv: Add KGDB support
  kgdb: Add kgdb_has_hit_break function
  RISC-V: Skip setting up PMPs on traps
  riscv: K210: Update defconfig
  riscv: K210: Add a built-in device tree
  riscv: Allow device trees to be built into the kernel

2 files changed, 51 insertions, 1 deletions

diff --git a/drivers/soc/kendryte/k210-sysctl.c b/drivers/soc/kendryte/k210-sysctl.c
index 4608fbca20e1..707019223dd8 100644
--- a/drivers/soc/kendryte/k210-sysctl.c
+++ b/drivers/soc/kendryte/k210-sysctl.c
@@ -246,3 +246,15 @@ static void __init k210_soc_early_init(const void *fdt)
 	iounmap(regs);
 }
 SOC_EARLY_INIT_DECLARE(generic_k210, "kendryte,k210", k210_soc_early_init);
+
+#ifdef CONFIG_SOC_KENDRYTE_K210_DTB_BUILTIN
+/*
+ * Generic entry for the default k210.dtb embedded DTB for boards with:
+ *   - Vendor ID: 0x4B5
+ *   - Arch ID: 0xE59889E6A5A04149 (= "Canaan AI" in UTF-8 encoded Chinese)
+ *   - Impl ID:	0x4D41495832303030 (= "MAIX2000")
+ * These values are reported by the SiPEED MAXDUINO, SiPEED MAIX GO and
+ * SiPEED Dan dock boards.
+ */
+SOC_BUILTIN_DTB_DECLARE(k210, 0x4B5, 0xE59889E6A5A04149, 0x4D41495832303030);
+#endif
diff --git a/drivers/soc/sifive/sifive_l2_cache.c b/drivers/soc/sifive/sifive_l2_cache.c
index a5069394cd61..44d7e1951da3 100644
--- a/drivers/soc/sifive/sifive_l2_cache.c
+++ b/drivers/soc/sifive/sifive_l2_cache.c
@@ -9,6 +9,8 @@
 #include <linux/interrupt.h>
 #include <linux/of_irq.h>
 #include <linux/of_address.h>
+#include <linux/device.h>
+#include <asm/cacheinfo.h>
 #include <soc/sifive/sifive_l2_cache.h>
 
 #define SIFIVE_L2_DIRECCFIX_LOW 0x100
@@ -31,6 +33,7 @@
 
 static void __iomem *l2_base;
 static int g_irq[SIFIVE_L2_MAX_ECCINTR];
+static struct riscv_cacheinfo_ops l2_cache_ops;
 
 enum {
 	DIR_CORR = 0,
@@ -48,7 +51,7 @@ static ssize_t l2_write(struct file *file, const char __user *data,
 
 	if (kstrtouint_from_user(data, count, 0, &val))
 		return -EINVAL;
-	if ((val >= 0 && val < 0xFF) || (val >= 0x10000 && val < 0x100FF))
+	if ((val < 0xFF) || (val >= 0x10000 && val < 0x100FF))
 		writel(val, l2_base + SIFIVE_L2_ECCINJECTERR);
 	else
 		return -EINVAL;
@@ -107,6 +110,38 @@ int unregister_sifive_l2_error_notifier(struct notifier_block *nb)
 }
 EXPORT_SYMBOL_GPL(unregister_sifive_l2_error_notifier);
 
+static int l2_largest_wayenabled(void)
+{
+	return readl(l2_base + SIFIVE_L2_WAYENABLE) & 0xFF;
+}
+
+static ssize_t number_of_ways_enabled_show(struct device *dev,
+					   struct device_attribute *attr,
+					   char *buf)
+{
+	return sprintf(buf, "%u\n", l2_largest_wayenabled());
+}
+
+static DEVICE_ATTR_RO(number_of_ways_enabled);
+
+static struct attribute *priv_attrs[] = {
+	&dev_attr_number_of_ways_enabled.attr,
+	NULL,
+};
+
+static const struct attribute_group priv_attr_group = {
+	.attrs = priv_attrs,
+};
+
+static const struct attribute_group *l2_get_priv_group(struct cacheinfo *this_leaf)
+{
+	/* We want to use private group for L2 cache only */
+	if (this_leaf->level == 2)
+		return &priv_attr_group;
+	else
+		return NULL;
+}
+
 static irqreturn_t l2_int_handler(int irq, void *device)
 {
 	unsigned int add_h, add_l;
@@ -170,6 +205,9 @@ static int __init sifive_l2_init(void)
 
 	l2_config_read();
 
+	l2_cache_ops.get_priv_group = l2_get_priv_group;
+	riscv_set_cacheinfo_ops(&l2_cache_ops);
+
 #ifdef CONFIG_DEBUG_FS
 	setup_sifive_debug();
 #endif