target/linux/sifiveu/patches-6.1/0006-riscv-sbi-srst-support.patch

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  88 From: Anup Patel <anup.patel@wdc.com>
  89 To: Palmer Dabbelt <palmer@dabbelt.com>,
  90  Palmer Dabbelt <palmerdabbelt@google.com>,
  91  Paul Walmsley <paul.walmsley@sifive.com>, Albert Ou <aou@eecs.berkeley.edu>
  92 Cc: Atish Patra <atish.patra@wdc.com>,
  93  Alistair Francis <Alistair.Francis@wdc.com>,
  94  Anup Patel <anup@brainfault.org>, linux-riscv@lists.infradead.org,
  95  linux-kernel@vger.kernel.org, Anup Patel <anup.patel@wdc.com>
  96 Subject: [PATCH v7 1/1] RISC-V: Use SBI SRST extension when available
  97 Date: Wed,  9 Jun 2021 17:43:22 +0530
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 178 Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org
 179
 180 The SBI SRST extension provides a standard way to poweroff and
 181 reboot the system irrespective to whether Linux RISC-V S-mode
 182 is running natively (HS-mode) or inside Guest/VM (VS-mode).
 183
 184 The SBI SRST extension is available in the SBI v0.3 specification.
 185 (Refer, https://github.com/riscv/riscv-sbi-doc/releases/tag/v0.3.0-rc1)
 186
 187 This patch extends Linux RISC-V SBI implementation to detect
 188 and use SBI SRST extension.
 189
 190 Signed-off-by: Anup Patel <anup.patel@wdc.com>
 191 Reviewed-by: Atish Patra <atish.patra@wdc.com>
 192 ---
 193  arch/riscv/include/asm/sbi.h | 24 ++++++++++++++++++++++++
 194  arch/riscv/kernel/sbi.c      | 35 +++++++++++++++++++++++++++++++++++
 195  2 files changed, 59 insertions(+)
 196
 197 --- a/arch/riscv/include/asm/sbi.h
 198 +++ b/arch/riscv/include/asm/sbi.h
 199 @@ -27,6 +27,7 @@ enum sbi_ext_id {
 200         SBI_EXT_IPI = 0x735049,
 201         SBI_EXT_RFENCE = 0x52464E43,
 202         SBI_EXT_HSM = 0x48534D,
 203 +       SBI_EXT_SRST = 0x53525354,
 204  };
 205
 206  enum sbi_ext_base_fid {
 207 @@ -70,6 +71,21 @@ enum sbi_hsm_hart_status {
 208         SBI_HSM_HART_STATUS_STOP_PENDING,
 209  };
 210
 211 +enum sbi_ext_srst_fid {
 212 +       SBI_EXT_SRST_RESET = 0,
 213 +};
 214 +
 215 +enum sbi_srst_reset_type {
 216 +       SBI_SRST_RESET_TYPE_SHUTDOWN = 0,
 217 +       SBI_SRST_RESET_TYPE_COLD_REBOOT,
 218 +       SBI_SRST_RESET_TYPE_WARM_REBOOT,
 219 +};
 220 +
 221 +enum sbi_srst_reset_reason {
 222 +       SBI_SRST_RESET_REASON_NONE = 0,
 223 +       SBI_SRST_RESET_REASON_SYS_FAILURE,
 224 +};
 225 +
 226  #define SBI_SPEC_VERSION_DEFAULT       0x1
 227  #define SBI_SPEC_VERSION_MAJOR_SHIFT   24
 228  #define SBI_SPEC_VERSION_MAJOR_MASK    0x7f
 229 @@ -148,6 +164,14 @@ static inline unsigned long sbi_minor_ve
 230         return sbi_spec_version & SBI_SPEC_VERSION_MINOR_MASK;
 231  }
 232
 233 +/* Make SBI version */
 234 +static inline unsigned long sbi_mk_version(unsigned long major,
 235 +                                           unsigned long minor)
 236 +{
 237 +       return ((major & SBI_SPEC_VERSION_MAJOR_MASK) <<
 238 +               SBI_SPEC_VERSION_MAJOR_SHIFT) | minor;
 239 +}
 240 +
 241  int sbi_err_map_linux_errno(int err);
 242  #else /* CONFIG_RISCV_SBI */
 243  static inline int sbi_remote_fence_i(const unsigned long *hart_mask) { return -1; }
 244 --- a/arch/riscv/kernel/sbi.c
 245 +++ b/arch/riscv/kernel/sbi.c
 246 @@ -7,6 +7,7 @@
 247
 248  #include <linux/init.h>
 249  #include <linux/pm.h>
 250 +#include <linux/reboot.h>
 251  #include <asm/sbi.h>
 252  #include <asm/smp.h>
 253
 254 @@ -501,6 +502,32 @@ int sbi_remote_hfence_vvma_asid(const un
 255  }
 256  EXPORT_SYMBOL(sbi_remote_hfence_vvma_asid);
 257
 258 +static void sbi_srst_reset(unsigned long type, unsigned long reason)
 259 +{
 260 +       sbi_ecall(SBI_EXT_SRST, SBI_EXT_SRST_RESET, type, reason,
 261 +                 0, 0, 0, 0);
 262 +       pr_warn("%s: type=0x%lx reason=0x%lx failed\n",
 263 +               __func__, type, reason);
 264 +}
 265 +
 266 +static int sbi_srst_reboot(struct notifier_block *this,
 267 +                          unsigned long mode, void *cmd)
 268 +{
 269 +       sbi_srst_reset((mode == REBOOT_WARM || mode == REBOOT_SOFT) ?
 270 +                      SBI_SRST_RESET_TYPE_WARM_REBOOT :
 271 +                      SBI_SRST_RESET_TYPE_COLD_REBOOT,
 272 +                      SBI_SRST_RESET_REASON_NONE);
 273 +       return NOTIFY_DONE;
 274 +}
 275 +
 276 +static struct notifier_block sbi_srst_reboot_nb;
 277 +
 278 +static void sbi_srst_power_off(void)
 279 +{
 280 +       sbi_srst_reset(SBI_SRST_RESET_TYPE_SHUTDOWN,
 281 +                      SBI_SRST_RESET_REASON_NONE);
 282 +}
 283 +
 284  /**
 285   * sbi_probe_extension() - Check if an SBI extension ID is supported or not.
 286   * @extid: The extension ID to be probed.
 287 @@ -608,6 +635,14 @@ void __init sbi_init(void)
 288                 } else {
 289                         __sbi_rfence    = __sbi_rfence_v01;
 290                 }
 291 +               if ((sbi_spec_version >= sbi_mk_version(0, 3)) &&
 292 +                   (sbi_probe_extension(SBI_EXT_SRST) > 0)) {
 293 +                       pr_info("SBI SRST extension detected\n");
 294 +                       pm_power_off = sbi_srst_power_off;
 295 +                       sbi_srst_reboot_nb.notifier_call = sbi_srst_reboot;
 296 +                       sbi_srst_reboot_nb.priority = 192;
 297 +                       register_restart_handler(&sbi_srst_reboot_nb);
 298 +               }
 299         } else {
 300                 __sbi_set_timer = __sbi_set_timer_v01;
 301                 __sbi_send_ipi  = __sbi_send_ipi_v01;