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The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: On QEMU virt machine with large number of HARTs, some of the HARTs randomly fail to come out of wait_for_coldboot() due to one of the following race-conditions: 1) Failing HARTs are not able to acquire the coldboot_lock and update the coldboot_hartmask in wait_for_coldboot() before the coldboot HART acquires the coldboot_lock and sends IPI in wake_coldboot_ha [...] Content analysis details: (-0.2 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2607:f8b0:4864:20:0:0:0:c2c listed in] [list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.0 T_SCC_BODY_TEXT_LINE No description available. X-BeenThere: opensbi@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "opensbi" Errors-To: opensbi-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org On QEMU virt machine with large number of HARTs, some of the HARTs randomly fail to come out of wait_for_coldboot() due to one of the following race-conditions: 1) Failing HARTs are not able to acquire the coldboot_lock and update the coldboot_hartmask in wait_for_coldboot() before the coldboot HART acquires the coldboot_lock and sends IPI in wake_coldboot_harts() hence the failing HARTs never receive IPI from the coldboot HART. 2) Failing HARTs acquire the coldbood_lock and update the coldboot_hartmask before coldboot HART does sbi_scratch_init() so the sbi_hartmask_set_hartid() does not update the coldboot_hartmask on the failing HARTs hence they never receive IPI from the coldboot HART. To address this, use a simple busy-loop in wait_for_coldboot() for polling on coldboot_done flag. Signed-off-by: Anup Patel --- include/sbi/riscv_barrier.h | 6 +++- lib/sbi/sbi_init.c | 70 ++----------------------------------- 2 files changed, 8 insertions(+), 68 deletions(-) diff --git a/include/sbi/riscv_barrier.h b/include/sbi/riscv_barrier.h index 1fba8b8..3d4a038 100644 --- a/include/sbi/riscv_barrier.h +++ b/include/sbi/riscv_barrier.h @@ -40,7 +40,11 @@ #define smp_wmb() RISCV_FENCE(w,w) /* CPU relax for busy loop */ -#define cpu_relax() asm volatile ("" : : : "memory") +#define cpu_relax() \ +do { \ + unsigned long __t; \ + __asm__ __volatile__ ("div %0, %0, zero" : "=r" (__t)); \ +} while (0) /* clang-format on */ diff --git a/lib/sbi/sbi_init.c b/lib/sbi/sbi_init.c index 796cccc..b3f3e38 100644 --- a/lib/sbi/sbi_init.c +++ b/lib/sbi/sbi_init.c @@ -10,7 +10,6 @@ #include #include #include -#include #include #include #include @@ -190,82 +189,19 @@ static void sbi_boot_print_hart(struct sbi_scratch *scratch, u32 hartid) sbi_hart_delegation_dump(scratch, "Boot HART ", " "); } -static spinlock_t coldboot_lock = SPIN_LOCK_INITIALIZER; -static struct sbi_hartmask coldboot_wait_hmask = { 0 }; - static unsigned long coldboot_done; static void wait_for_coldboot(struct sbi_scratch *scratch, u32 hartid) { - unsigned long saved_mie, cmip; - - if (__smp_load_acquire(&coldboot_done)) - return; - - /* Save MIE CSR */ - saved_mie = csr_read(CSR_MIE); - - /* Set MSIE and MEIE bits to receive IPI */ - csr_set(CSR_MIE, MIP_MSIP | MIP_MEIP); - - /* Acquire coldboot lock */ - spin_lock(&coldboot_lock); - - /* Mark current HART as waiting */ - sbi_hartmask_set_hartid(hartid, &coldboot_wait_hmask); - - /* Release coldboot lock */ - spin_unlock(&coldboot_lock); - - /* Wait for coldboot to finish using WFI */ - while (!__smp_load_acquire(&coldboot_done)) { - do { - wfi(); - cmip = csr_read(CSR_MIP); - } while (!(cmip & (MIP_MSIP | MIP_MEIP))); - } - - /* Acquire coldboot lock */ - spin_lock(&coldboot_lock); - - /* Unmark current HART as waiting */ - sbi_hartmask_clear_hartid(hartid, &coldboot_wait_hmask); - - /* Release coldboot lock */ - spin_unlock(&coldboot_lock); - - /* Restore MIE CSR */ - csr_write(CSR_MIE, saved_mie); - - /* - * The wait for coldboot is common for both warm startup and - * warm resume path so clearing IPI here would result in losing - * an IPI in warm resume path. - * - * Also, the sbi_platform_ipi_init() called from sbi_ipi_init() - * will automatically clear IPI for current HART. - */ + /* Wait for coldboot to finish */ + while (!__smp_load_acquire(&coldboot_done)) + cpu_relax(); } static void wake_coldboot_harts(struct sbi_scratch *scratch, u32 hartid) { - u32 i, hartindex = sbi_hartid_to_hartindex(hartid); - /* Mark coldboot done */ __smp_store_release(&coldboot_done, 1); - - /* Acquire coldboot lock */ - spin_lock(&coldboot_lock); - - /* Send an IPI to all HARTs waiting for coldboot */ - sbi_hartmask_for_each_hartindex(i, &coldboot_wait_hmask) { - if (i == hartindex) - continue; - sbi_ipi_raw_send(i); - } - - /* Release coldboot lock */ - spin_unlock(&coldboot_lock); } static unsigned long entry_count_offset; From patchwork Tue Mar 19 14:59:30 2024 Content-Type: text/plain; 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The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Currently, all non-coldboot HARTs busy spin in wait_for_coldboot() until the entire coldboot init sequence is completed. This means: 1) On QEMU, all non-coldboot HARTs will eat host CPU time and also slow down the coldboot HART until the entire coldboot init sequence is completed. 2) On real HW, all non-coldboot HARTs w [...] Content analysis details: (-0.2 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2607:f8b0:4864:20:0:0:0:c36 listed in] [list.dnswl.org] -0.0 T_SCC_BODY_TEXT_LINE No description available. X-BeenThere: opensbi@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "opensbi" Errors-To: opensbi-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org Currently, all non-coldboot HARTs busy spin in wait_for_coldboot() until the entire coldboot init sequence is completed. This means: 1) On QEMU, all non-coldboot HARTs will eat host CPU time and also slow down the coldboot HART until the entire coldboot init sequence is completed. 2) On real HW, all non-coldboot HARTs will consume more CPU power until the entire coldboot init sequence is completed. To address this, wake up all non-coldboot HARTs as early as possible in the coldboot init sequence. Signed-off-by: Anup Patel --- lib/sbi/sbi_init.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/lib/sbi/sbi_init.c b/lib/sbi/sbi_init.c index b3f3e38..8fdc8de 100644 --- a/lib/sbi/sbi_init.c +++ b/lib/sbi/sbi_init.c @@ -243,6 +243,14 @@ static void __noreturn init_coldboot(struct sbi_scratch *scratch, u32 hartid) if (rc) sbi_hart_hang(); + /* + * All non-coldboot HARTs do HSM initialization (i.e. enter HSM state + * machine) at the start of the warmboot path so it is wasteful to + * have these HARTs busy spin in wait_for_coldboot() until coldboot + * path is completed. + */ + wake_coldboot_harts(scratch, hartid); + rc = sbi_platform_early_init(plat, true); if (rc) sbi_hart_hang(); @@ -348,8 +356,6 @@ static void __noreturn init_coldboot(struct sbi_scratch *scratch, u32 hartid) sbi_hart_hang(); } - wake_coldboot_harts(scratch, hartid); - count = sbi_scratch_offset_ptr(scratch, init_count_offset); (*count)++; @@ -369,6 +375,7 @@ static void __noreturn init_warm_startup(struct sbi_scratch *scratch, count = sbi_scratch_offset_ptr(scratch, entry_count_offset); (*count)++; + /* Note: This has to be first thing in warmboot init sequence */ rc = sbi_hsm_init(scratch, hartid, false); if (rc) sbi_hart_hang();