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FAILED: patch "[PATCH] tools lib traceevent: Do not free tep->cmdlines in" failed to apply to 4.14-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From b0215e2d6a18d8331b2d4a8b38ccf3eff783edb1 Mon Sep 17 00:00:00 2001 From: "Steven Rostedt (VMware)" <rostedt(a)goodmis.org> Date: Wed, 28 Aug 2019 15:05:28 -0400 Subject: [PATCH] tools lib traceevent: Do not free tep->cmdlines in add_new_comm() on failure If the re-allocation of tep->cmdlines succeeds, then the previous allocation of tep->cmdlines will be freed. If we later fail in add_new_comm(), we must not free cmdlines, and also should assign tep->cmdlines to the new allocation. Otherwise when freeing tep, the tep->cmdlines will be pointing to garbage. Fixes: a6d2a61ac653a ("tools lib traceevent: Remove some die() calls") Signed-off-by: Steven Rostedt (VMware) <rostedt(a)goodmis.org> Cc: Andrew Morton <akpm(a)linux-foundation.org> Cc: Jiri Olsa <jolsa(a)redhat.com> Cc: Namhyung Kim <namhyung(a)kernel.org> Cc: linux-trace-devel(a)vger.kernel.org Cc: stable(a)vger.kernel.org Link: http://lkml.kernel.org/r/20190828191819.970121417@goodmis.org Signed-off-by: Arnaldo Carvalho de Melo <acme(a)redhat.com> diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c index b36b536a9fcb..13fd9fdf91e0 100644 --- a/tools/lib/traceevent/event-parse.c +++ b/tools/lib/traceevent/event-parse.c @@ -269,10 +269,10 @@ static int add_new_comm(struct tep_handle *tep, errno = ENOMEM; return -1; } + tep->cmdlines = cmdlines; cmdlines[tep->cmdline_count].comm = strdup(comm); if (!cmdlines[tep->cmdline_count].comm) { - free(cmdlines); errno = ENOMEM; return -1; } @@ -283,7 +283,6 @@ static int add_new_comm(struct tep_handle *tep, tep->cmdline_count++; qsort(cmdlines, tep->cmdline_count, sizeof(*cmdlines), cmdline_cmp); - tep->cmdlines = cmdlines; return 0; }

5 years, 9 months

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FAILED: patch "[PATCH] tools lib traceevent: Do not free tep->cmdlines in" failed to apply to 4.4-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From b0215e2d6a18d8331b2d4a8b38ccf3eff783edb1 Mon Sep 17 00:00:00 2001 From: "Steven Rostedt (VMware)" <rostedt(a)goodmis.org> Date: Wed, 28 Aug 2019 15:05:28 -0400 Subject: [PATCH] tools lib traceevent: Do not free tep->cmdlines in add_new_comm() on failure If the re-allocation of tep->cmdlines succeeds, then the previous allocation of tep->cmdlines will be freed. If we later fail in add_new_comm(), we must not free cmdlines, and also should assign tep->cmdlines to the new allocation. Otherwise when freeing tep, the tep->cmdlines will be pointing to garbage. Fixes: a6d2a61ac653a ("tools lib traceevent: Remove some die() calls") Signed-off-by: Steven Rostedt (VMware) <rostedt(a)goodmis.org> Cc: Andrew Morton <akpm(a)linux-foundation.org> Cc: Jiri Olsa <jolsa(a)redhat.com> Cc: Namhyung Kim <namhyung(a)kernel.org> Cc: linux-trace-devel(a)vger.kernel.org Cc: stable(a)vger.kernel.org Link: http://lkml.kernel.org/r/20190828191819.970121417@goodmis.org Signed-off-by: Arnaldo Carvalho de Melo <acme(a)redhat.com> diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c index b36b536a9fcb..13fd9fdf91e0 100644 --- a/tools/lib/traceevent/event-parse.c +++ b/tools/lib/traceevent/event-parse.c @@ -269,10 +269,10 @@ static int add_new_comm(struct tep_handle *tep, errno = ENOMEM; return -1; } + tep->cmdlines = cmdlines; cmdlines[tep->cmdline_count].comm = strdup(comm); if (!cmdlines[tep->cmdline_count].comm) { - free(cmdlines); errno = ENOMEM; return -1; } @@ -283,7 +283,6 @@ static int add_new_comm(struct tep_handle *tep, tep->cmdline_count++; qsort(cmdlines, tep->cmdline_count, sizeof(*cmdlines), cmdline_cmp); - tep->cmdlines = cmdlines; return 0; }

5 years, 9 months

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FAILED: patch "[PATCH] tools lib traceevent: Do not free tep->cmdlines in" failed to apply to 4.9-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From b0215e2d6a18d8331b2d4a8b38ccf3eff783edb1 Mon Sep 17 00:00:00 2001 From: "Steven Rostedt (VMware)" <rostedt(a)goodmis.org> Date: Wed, 28 Aug 2019 15:05:28 -0400 Subject: [PATCH] tools lib traceevent: Do not free tep->cmdlines in add_new_comm() on failure If the re-allocation of tep->cmdlines succeeds, then the previous allocation of tep->cmdlines will be freed. If we later fail in add_new_comm(), we must not free cmdlines, and also should assign tep->cmdlines to the new allocation. Otherwise when freeing tep, the tep->cmdlines will be pointing to garbage. Fixes: a6d2a61ac653a ("tools lib traceevent: Remove some die() calls") Signed-off-by: Steven Rostedt (VMware) <rostedt(a)goodmis.org> Cc: Andrew Morton <akpm(a)linux-foundation.org> Cc: Jiri Olsa <jolsa(a)redhat.com> Cc: Namhyung Kim <namhyung(a)kernel.org> Cc: linux-trace-devel(a)vger.kernel.org Cc: stable(a)vger.kernel.org Link: http://lkml.kernel.org/r/20190828191819.970121417@goodmis.org Signed-off-by: Arnaldo Carvalho de Melo <acme(a)redhat.com> diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c index b36b536a9fcb..13fd9fdf91e0 100644 --- a/tools/lib/traceevent/event-parse.c +++ b/tools/lib/traceevent/event-parse.c @@ -269,10 +269,10 @@ static int add_new_comm(struct tep_handle *tep, errno = ENOMEM; return -1; } + tep->cmdlines = cmdlines; cmdlines[tep->cmdline_count].comm = strdup(comm); if (!cmdlines[tep->cmdline_count].comm) { - free(cmdlines); errno = ENOMEM; return -1; } @@ -283,7 +283,6 @@ static int add_new_comm(struct tep_handle *tep, tep->cmdline_count++; qsort(cmdlines, tep->cmdline_count, sizeof(*cmdlines), cmdline_cmp); - tep->cmdlines = cmdlines; return 0; }

5 years, 9 months

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FAILED: patch "[PATCH] powerpc/pseries: Fix cpu_hotplug_lock acquisition in" failed to apply to 4.14-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From c784be435d5dae28d3b03db31753dd7a18733f0c Mon Sep 17 00:00:00 2001 From: "Gautham R. Shenoy" <ego(a)linux.vnet.ibm.com> Date: Wed, 15 May 2019 13:15:52 +0530 Subject: [PATCH] powerpc/pseries: Fix cpu_hotplug_lock acquisition in resize_hpt() The calls to arch_add_memory()/arch_remove_memory() are always made with the read-side cpu_hotplug_lock acquired via memory_hotplug_begin(). On pSeries, arch_add_memory()/arch_remove_memory() eventually call resize_hpt() which in turn calls stop_machine() which acquires the read-side cpu_hotplug_lock again, thereby resulting in the recursive acquisition of this lock. In the absence of CONFIG_PROVE_LOCKING, we hadn't observed a system lockup during a memory hotplug operation because cpus_read_lock() is a per-cpu rwsem read, which, in the fast-path (in the absence of the writer, which in our case is a CPU-hotplug operation) simply increments the read_count on the semaphore. Thus a recursive read in the fast-path doesn't cause any problems. However, we can hit this problem in practice if there is a concurrent CPU-Hotplug operation in progress which is waiting to acquire the write-side of the lock. This will cause the second recursive read to block until the writer finishes. While the writer is blocked since the first read holds the lock. Thus both the reader as well as the writers fail to make any progress thereby blocking both CPU-Hotplug as well as Memory Hotplug operations. Memory-Hotplug CPU-Hotplug CPU 0 CPU 1 ------ ------ 1. down_read(cpu_hotplug_lock.rw_sem) [memory_hotplug_begin] 2. down_write(cpu_hotplug_lock.rw_sem) [cpu_up/cpu_down] 3. down_read(cpu_hotplug_lock.rw_sem) [stop_machine()] Lockdep complains as follows in these code-paths. swapper/0/1 is trying to acquire lock: (____ptrval____) (cpu_hotplug_lock.rw_sem){++++}, at: stop_machine+0x2c/0x60 but task is already holding lock: (____ptrval____) (cpu_hotplug_lock.rw_sem){++++}, at: mem_hotplug_begin+0x20/0x50 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(cpu_hotplug_lock.rw_sem); lock(cpu_hotplug_lock.rw_sem); *** DEADLOCK *** May be due to missing lock nesting notation 3 locks held by swapper/0/1: #0: (____ptrval____) (&dev->mutex){....}, at: __driver_attach+0x12c/0x1b0 #1: (____ptrval____) (cpu_hotplug_lock.rw_sem){++++}, at: mem_hotplug_begin+0x20/0x50 #2: (____ptrval____) (mem_hotplug_lock.rw_sem){++++}, at: percpu_down_write+0x54/0x1a0 stack backtrace: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.0.0-rc5-58373-gbc99402235f3-dirty #166 Call Trace: dump_stack+0xe8/0x164 (unreliable) __lock_acquire+0x1110/0x1c70 lock_acquire+0x240/0x290 cpus_read_lock+0x64/0xf0 stop_machine+0x2c/0x60 pseries_lpar_resize_hpt+0x19c/0x2c0 resize_hpt_for_hotplug+0x70/0xd0 arch_add_memory+0x58/0xfc devm_memremap_pages+0x5e8/0x8f0 pmem_attach_disk+0x764/0x830 nvdimm_bus_probe+0x118/0x240 really_probe+0x230/0x4b0 driver_probe_device+0x16c/0x1e0 __driver_attach+0x148/0x1b0 bus_for_each_dev+0x90/0x130 driver_attach+0x34/0x50 bus_add_driver+0x1a8/0x360 driver_register+0x108/0x170 __nd_driver_register+0xd0/0xf0 nd_pmem_driver_init+0x34/0x48 do_one_initcall+0x1e0/0x45c kernel_init_freeable+0x540/0x64c kernel_init+0x2c/0x160 ret_from_kernel_thread+0x5c/0x68 Fix this issue by 1) Requiring all the calls to pseries_lpar_resize_hpt() be made with cpu_hotplug_lock held. 2) In pseries_lpar_resize_hpt() invoke stop_machine_cpuslocked() as a consequence of 1) 3) To satisfy 1), in hpt_order_set(), call mmu_hash_ops.resize_hpt() with cpu_hotplug_lock held. Fixes: dbcf929c0062 ("powerpc/pseries: Add support for hash table resizing") Cc: stable(a)vger.kernel.org # v4.11+ Reported-by: Aneesh Kumar K.V <aneesh.kumar(a)linux.ibm.com> Signed-off-by: Gautham R. Shenoy <ego(a)linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe(a)ellerman.id.au> Link: https://lore.kernel.org/r/1557906352-29048-1-git-send-email-ego@linux.vnet.… diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c index e6d471058597..c363e850550e 100644 --- a/arch/powerpc/mm/book3s64/hash_utils.c +++ b/arch/powerpc/mm/book3s64/hash_utils.c @@ -34,6 +34,7 @@ #include <linux/libfdt.h> #include <linux/pkeys.h> #include <linux/hugetlb.h> +#include <linux/cpu.h> #include <asm/debugfs.h> #include <asm/processor.h> @@ -1931,10 +1932,16 @@ static int hpt_order_get(void *data, u64 *val) static int hpt_order_set(void *data, u64 val) { + int ret; + if (!mmu_hash_ops.resize_hpt) return -ENODEV; - return mmu_hash_ops.resize_hpt(val); + cpus_read_lock(); + ret = mmu_hash_ops.resize_hpt(val); + cpus_read_unlock(); + + return ret; } DEFINE_DEBUGFS_ATTRIBUTE(fops_hpt_order, hpt_order_get, hpt_order_set, "%llu\n"); diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c index 09bb878c21e0..4f76e5f30c97 100644 --- a/arch/powerpc/platforms/pseries/lpar.c +++ b/arch/powerpc/platforms/pseries/lpar.c @@ -1413,7 +1413,10 @@ static int pseries_lpar_resize_hpt_commit(void *data) return 0; } -/* Must be called in user context */ +/* + * Must be called in process context. The caller must hold the + * cpus_lock. + */ static int pseries_lpar_resize_hpt(unsigned long shift) { struct hpt_resize_state state = { @@ -1467,7 +1470,8 @@ static int pseries_lpar_resize_hpt(unsigned long shift) t1 = ktime_get(); - rc = stop_machine(pseries_lpar_resize_hpt_commit, &state, NULL); + rc = stop_machine_cpuslocked(pseries_lpar_resize_hpt_commit, + &state, NULL); t2 = ktime_get();

5 years, 9 months

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FAILED: patch "[PATCH] powerpc/pseries: Fix cpu_hotplug_lock acquisition in" failed to apply to 4.14-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From c784be435d5dae28d3b03db31753dd7a18733f0c Mon Sep 17 00:00:00 2001 From: "Gautham R. Shenoy" <ego(a)linux.vnet.ibm.com> Date: Wed, 15 May 2019 13:15:52 +0530 Subject: [PATCH] powerpc/pseries: Fix cpu_hotplug_lock acquisition in resize_hpt() The calls to arch_add_memory()/arch_remove_memory() are always made with the read-side cpu_hotplug_lock acquired via memory_hotplug_begin(). On pSeries, arch_add_memory()/arch_remove_memory() eventually call resize_hpt() which in turn calls stop_machine() which acquires the read-side cpu_hotplug_lock again, thereby resulting in the recursive acquisition of this lock. In the absence of CONFIG_PROVE_LOCKING, we hadn't observed a system lockup during a memory hotplug operation because cpus_read_lock() is a per-cpu rwsem read, which, in the fast-path (in the absence of the writer, which in our case is a CPU-hotplug operation) simply increments the read_count on the semaphore. Thus a recursive read in the fast-path doesn't cause any problems. However, we can hit this problem in practice if there is a concurrent CPU-Hotplug operation in progress which is waiting to acquire the write-side of the lock. This will cause the second recursive read to block until the writer finishes. While the writer is blocked since the first read holds the lock. Thus both the reader as well as the writers fail to make any progress thereby blocking both CPU-Hotplug as well as Memory Hotplug operations. Memory-Hotplug CPU-Hotplug CPU 0 CPU 1 ------ ------ 1. down_read(cpu_hotplug_lock.rw_sem) [memory_hotplug_begin] 2. down_write(cpu_hotplug_lock.rw_sem) [cpu_up/cpu_down] 3. down_read(cpu_hotplug_lock.rw_sem) [stop_machine()] Lockdep complains as follows in these code-paths. swapper/0/1 is trying to acquire lock: (____ptrval____) (cpu_hotplug_lock.rw_sem){++++}, at: stop_machine+0x2c/0x60 but task is already holding lock: (____ptrval____) (cpu_hotplug_lock.rw_sem){++++}, at: mem_hotplug_begin+0x20/0x50 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(cpu_hotplug_lock.rw_sem); lock(cpu_hotplug_lock.rw_sem); *** DEADLOCK *** May be due to missing lock nesting notation 3 locks held by swapper/0/1: #0: (____ptrval____) (&dev->mutex){....}, at: __driver_attach+0x12c/0x1b0 #1: (____ptrval____) (cpu_hotplug_lock.rw_sem){++++}, at: mem_hotplug_begin+0x20/0x50 #2: (____ptrval____) (mem_hotplug_lock.rw_sem){++++}, at: percpu_down_write+0x54/0x1a0 stack backtrace: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.0.0-rc5-58373-gbc99402235f3-dirty #166 Call Trace: dump_stack+0xe8/0x164 (unreliable) __lock_acquire+0x1110/0x1c70 lock_acquire+0x240/0x290 cpus_read_lock+0x64/0xf0 stop_machine+0x2c/0x60 pseries_lpar_resize_hpt+0x19c/0x2c0 resize_hpt_for_hotplug+0x70/0xd0 arch_add_memory+0x58/0xfc devm_memremap_pages+0x5e8/0x8f0 pmem_attach_disk+0x764/0x830 nvdimm_bus_probe+0x118/0x240 really_probe+0x230/0x4b0 driver_probe_device+0x16c/0x1e0 __driver_attach+0x148/0x1b0 bus_for_each_dev+0x90/0x130 driver_attach+0x34/0x50 bus_add_driver+0x1a8/0x360 driver_register+0x108/0x170 __nd_driver_register+0xd0/0xf0 nd_pmem_driver_init+0x34/0x48 do_one_initcall+0x1e0/0x45c kernel_init_freeable+0x540/0x64c kernel_init+0x2c/0x160 ret_from_kernel_thread+0x5c/0x68 Fix this issue by 1) Requiring all the calls to pseries_lpar_resize_hpt() be made with cpu_hotplug_lock held. 2) In pseries_lpar_resize_hpt() invoke stop_machine_cpuslocked() as a consequence of 1) 3) To satisfy 1), in hpt_order_set(), call mmu_hash_ops.resize_hpt() with cpu_hotplug_lock held. Fixes: dbcf929c0062 ("powerpc/pseries: Add support for hash table resizing") Cc: stable(a)vger.kernel.org # v4.11+ Reported-by: Aneesh Kumar K.V <aneesh.kumar(a)linux.ibm.com> Signed-off-by: Gautham R. Shenoy <ego(a)linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe(a)ellerman.id.au> Link: https://lore.kernel.org/r/1557906352-29048-1-git-send-email-ego@linux.vnet.… diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c index e6d471058597..c363e850550e 100644 --- a/arch/powerpc/mm/book3s64/hash_utils.c +++ b/arch/powerpc/mm/book3s64/hash_utils.c @@ -34,6 +34,7 @@ #include <linux/libfdt.h> #include <linux/pkeys.h> #include <linux/hugetlb.h> +#include <linux/cpu.h> #include <asm/debugfs.h> #include <asm/processor.h> @@ -1931,10 +1932,16 @@ static int hpt_order_get(void *data, u64 *val) static int hpt_order_set(void *data, u64 val) { + int ret; + if (!mmu_hash_ops.resize_hpt) return -ENODEV; - return mmu_hash_ops.resize_hpt(val); + cpus_read_lock(); + ret = mmu_hash_ops.resize_hpt(val); + cpus_read_unlock(); + + return ret; } DEFINE_DEBUGFS_ATTRIBUTE(fops_hpt_order, hpt_order_get, hpt_order_set, "%llu\n"); diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c index 09bb878c21e0..4f76e5f30c97 100644 --- a/arch/powerpc/platforms/pseries/lpar.c +++ b/arch/powerpc/platforms/pseries/lpar.c @@ -1413,7 +1413,10 @@ static int pseries_lpar_resize_hpt_commit(void *data) return 0; } -/* Must be called in user context */ +/* + * Must be called in process context. The caller must hold the + * cpus_lock. + */ static int pseries_lpar_resize_hpt(unsigned long shift) { struct hpt_resize_state state = { @@ -1467,7 +1470,8 @@ static int pseries_lpar_resize_hpt(unsigned long shift) t1 = ktime_get(); - rc = stop_machine(pseries_lpar_resize_hpt_commit, &state, NULL); + rc = stop_machine_cpuslocked(pseries_lpar_resize_hpt_commit, + &state, NULL); t2 = ktime_get();

5 years, 9 months

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FAILED: patch "[PATCH] powerpc/xive: Implement get_irqchip_state method for XIVE to" failed to apply to 4.14-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From da15c03b047dca891d37b9f4ef9ca14d84a6484f Mon Sep 17 00:00:00 2001 From: Paul Mackerras <paulus(a)ozlabs.org> Date: Tue, 13 Aug 2019 20:06:48 +1000 Subject: [PATCH] powerpc/xive: Implement get_irqchip_state method for XIVE to fix shutdown race Testing has revealed the existence of a race condition where a XIVE interrupt being shut down can be in one of the XIVE interrupt queues (of which there are up to 8 per CPU, one for each priority) at the point where free_irq() is called. If this happens, can return an interrupt number which has been shut down. This can lead to various symptoms: - irq_to_desc(irq) can be NULL. In this case, no end-of-interrupt function gets called, resulting in the CPU's elevated interrupt priority (numerically lowered CPPR) never gets reset. That then means that the CPU stops processing interrupts, causing device timeouts and other errors in various device drivers. - The irq descriptor or related data structures can be in the process of being freed as the interrupt code is using them. This typically leads to crashes due to bad pointer dereferences. This race is basically what commit 62e0468650c3 ("genirq: Add optional hardware synchronization for shutdown", 2019-06-28) is intended to fix, given a get_irqchip_state() method for the interrupt controller being used. It works by polling the interrupt controller when an interrupt is being freed until the controller says it is not pending. With XIVE, the PQ bits of the interrupt source indicate the state of the interrupt source, and in particular the P bit goes from 0 to 1 at the point where the hardware writes an entry into the interrupt queue that this interrupt is directed towards. Normally, the code will then process the interrupt and do an end-of-interrupt (EOI) operation which will reset PQ to 00 (assuming another interrupt hasn't been generated in the meantime). However, there are situations where the code resets P even though a queue entry exists (for example, by setting PQ to 01, which disables the interrupt source), and also situations where the code leaves P at 1 after removing the queue entry (for example, this is done for escalation interrupts so they cannot fire again until they are explicitly re-enabled). The code already has a 'saved_p' flag for the interrupt source which indicates that a queue entry exists, although it isn't maintained consistently. This patch adds a 'stale_p' flag to indicate that P has been left at 1 after processing a queue entry, and adds code to set and clear saved_p and stale_p as necessary to maintain a consistent indication of whether a queue entry may or may not exist. With this, we can implement xive_get_irqchip_state() by looking at stale_p, saved_p and the ESB PQ bits for the interrupt. There is some additional code to handle escalation interrupts properly; because they are enabled and disabled in KVM assembly code, which does not have access to the xive_irq_data struct for the escalation interrupt. Hence, stale_p may be incorrect when the escalation interrupt is freed in kvmppc_xive_{,native_}cleanup_vcpu(). Fortunately, we can fix it up by looking at vcpu->arch.xive_esc_on, with some careful attention to barriers in order to ensure the correct result if xive_esc_irq() races with kvmppc_xive_cleanup_vcpu(). Finally, this adds code to make noise on the console (pr_crit and WARN_ON(1)) if we find an interrupt queue entry for an interrupt which does not have a descriptor. While this won't catch the race reliably, if it does get triggered it will be an indication that the race is occurring and needs to be debugged. Fixes: 243e25112d06 ("powerpc/xive: Native exploitation of the XIVE interrupt controller") Cc: stable(a)vger.kernel.org # v4.12+ Signed-off-by: Paul Mackerras <paulus(a)ozlabs.org> Signed-off-by: Michael Ellerman <mpe(a)ellerman.id.au> Link: https://lore.kernel.org/r/20190813100648.GE9567@blackberry diff --git a/arch/powerpc/include/asm/xive.h b/arch/powerpc/include/asm/xive.h index e4016985764e..efb0e597b272 100644 --- a/arch/powerpc/include/asm/xive.h +++ b/arch/powerpc/include/asm/xive.h @@ -46,7 +46,15 @@ struct xive_irq_data { /* Setup/used by frontend */ int target; + /* + * saved_p means that there is a queue entry for this interrupt + * in some CPU's queue (not including guest vcpu queues), even + * if P is not set in the source ESB. + * stale_p means that there is no queue entry for this interrupt + * in some CPU's queue, even if P is set in the source ESB. + */ bool saved_p; + bool stale_p; }; #define XIVE_IRQ_FLAG_STORE_EOI 0x01 #define XIVE_IRQ_FLAG_LSI 0x02 diff --git a/arch/powerpc/kvm/book3s_xive.c b/arch/powerpc/kvm/book3s_xive.c index 586867e46e51..591bfb4bfd0f 100644 --- a/arch/powerpc/kvm/book3s_xive.c +++ b/arch/powerpc/kvm/book3s_xive.c @@ -166,6 +166,9 @@ static irqreturn_t xive_esc_irq(int irq, void *data) */ vcpu->arch.xive_esc_on = false; + /* This orders xive_esc_on = false vs. subsequent stale_p = true */ + smp_wmb(); /* goes with smp_mb() in cleanup_single_escalation */ + return IRQ_HANDLED; } @@ -1119,6 +1122,31 @@ void kvmppc_xive_disable_vcpu_interrupts(struct kvm_vcpu *vcpu) vcpu->arch.xive_esc_raddr = 0; } +/* + * In single escalation mode, the escalation interrupt is marked so + * that EOI doesn't re-enable it, but just sets the stale_p flag to + * indicate that the P bit has already been dealt with. However, the + * assembly code that enters the guest sets PQ to 00 without clearing + * stale_p (because it has no easy way to address it). Hence we have + * to adjust stale_p before shutting down the interrupt. + */ +void xive_cleanup_single_escalation(struct kvm_vcpu *vcpu, + struct kvmppc_xive_vcpu *xc, int irq) +{ + struct irq_data *d = irq_get_irq_data(irq); + struct xive_irq_data *xd = irq_data_get_irq_handler_data(d); + + /* + * This slightly odd sequence gives the right result + * (i.e. stale_p set if xive_esc_on is false) even if + * we race with xive_esc_irq() and xive_irq_eoi(). + */ + xd->stale_p = false; + smp_mb(); /* paired with smb_wmb in xive_esc_irq */ + if (!vcpu->arch.xive_esc_on) + xd->stale_p = true; +} + void kvmppc_xive_cleanup_vcpu(struct kvm_vcpu *vcpu) { struct kvmppc_xive_vcpu *xc = vcpu->arch.xive_vcpu; @@ -1143,6 +1171,9 @@ void kvmppc_xive_cleanup_vcpu(struct kvm_vcpu *vcpu) /* Free escalations */ for (i = 0; i < KVMPPC_XIVE_Q_COUNT; i++) { if (xc->esc_virq[i]) { + if (xc->xive->single_escalation) + xive_cleanup_single_escalation(vcpu, xc, + xc->esc_virq[i]); free_irq(xc->esc_virq[i], vcpu); irq_dispose_mapping(xc->esc_virq[i]); kfree(xc->esc_virq_names[i]); diff --git a/arch/powerpc/kvm/book3s_xive.h b/arch/powerpc/kvm/book3s_xive.h index 50494d0ee375..955b820ffd6d 100644 --- a/arch/powerpc/kvm/book3s_xive.h +++ b/arch/powerpc/kvm/book3s_xive.h @@ -282,6 +282,8 @@ int kvmppc_xive_select_target(struct kvm *kvm, u32 *server, u8 prio); int kvmppc_xive_attach_escalation(struct kvm_vcpu *vcpu, u8 prio, bool single_escalation); struct kvmppc_xive *kvmppc_xive_get_device(struct kvm *kvm, u32 type); +void xive_cleanup_single_escalation(struct kvm_vcpu *vcpu, + struct kvmppc_xive_vcpu *xc, int irq); #endif /* CONFIG_KVM_XICS */ #endif /* _KVM_PPC_BOOK3S_XICS_H */ diff --git a/arch/powerpc/kvm/book3s_xive_native.c b/arch/powerpc/kvm/book3s_xive_native.c index 11b91b46fc39..f0cab43e6f4b 100644 --- a/arch/powerpc/kvm/book3s_xive_native.c +++ b/arch/powerpc/kvm/book3s_xive_native.c @@ -71,6 +71,9 @@ void kvmppc_xive_native_cleanup_vcpu(struct kvm_vcpu *vcpu) for (i = 0; i < KVMPPC_XIVE_Q_COUNT; i++) { /* Free the escalation irq */ if (xc->esc_virq[i]) { + if (xc->xive->single_escalation) + xive_cleanup_single_escalation(vcpu, xc, + xc->esc_virq[i]); free_irq(xc->esc_virq[i], vcpu); irq_dispose_mapping(xc->esc_virq[i]); kfree(xc->esc_virq_names[i]); diff --git a/arch/powerpc/sysdev/xive/common.c b/arch/powerpc/sysdev/xive/common.c index 1cdb39575eae..be86fce1a84e 100644 --- a/arch/powerpc/sysdev/xive/common.c +++ b/arch/powerpc/sysdev/xive/common.c @@ -135,7 +135,7 @@ static u32 xive_read_eq(struct xive_q *q, bool just_peek) static u32 xive_scan_interrupts(struct xive_cpu *xc, bool just_peek) { u32 irq = 0; - u8 prio; + u8 prio = 0; /* Find highest pending priority */ while (xc->pending_prio != 0) { @@ -148,8 +148,19 @@ static u32 xive_scan_interrupts(struct xive_cpu *xc, bool just_peek) irq = xive_read_eq(&xc->queue[prio], just_peek); /* Found something ? That's it */ - if (irq) - break; + if (irq) { + if (just_peek || irq_to_desc(irq)) + break; + /* + * We should never get here; if we do then we must + * have failed to synchronize the interrupt properly + * when shutting it down. + */ + pr_crit("xive: got interrupt %d without descriptor, dropping\n", + irq); + WARN_ON(1); + continue; + } /* Clear pending bits */ xc->pending_prio &= ~(1 << prio); @@ -307,6 +318,7 @@ static void xive_do_queue_eoi(struct xive_cpu *xc) */ static void xive_do_source_eoi(u32 hw_irq, struct xive_irq_data *xd) { + xd->stale_p = false; /* If the XIVE supports the new "store EOI facility, use it */ if (xd->flags & XIVE_IRQ_FLAG_STORE_EOI) xive_esb_write(xd, XIVE_ESB_STORE_EOI, 0); @@ -350,7 +362,7 @@ static void xive_do_source_eoi(u32 hw_irq, struct xive_irq_data *xd) } } -/* irq_chip eoi callback */ +/* irq_chip eoi callback, called with irq descriptor lock held */ static void xive_irq_eoi(struct irq_data *d) { struct xive_irq_data *xd = irq_data_get_irq_handler_data(d); @@ -366,6 +378,8 @@ static void xive_irq_eoi(struct irq_data *d) if (!irqd_irq_disabled(d) && !irqd_is_forwarded_to_vcpu(d) && !(xd->flags & XIVE_IRQ_NO_EOI)) xive_do_source_eoi(irqd_to_hwirq(d), xd); + else + xd->stale_p = true; /* * Clear saved_p to indicate that it's no longer occupying @@ -397,11 +411,16 @@ static void xive_do_source_set_mask(struct xive_irq_data *xd, */ if (mask) { val = xive_esb_read(xd, XIVE_ESB_SET_PQ_01); - xd->saved_p = !!(val & XIVE_ESB_VAL_P); - } else if (xd->saved_p) + if (!xd->stale_p && !!(val & XIVE_ESB_VAL_P)) + xd->saved_p = true; + xd->stale_p = false; + } else if (xd->saved_p) { xive_esb_read(xd, XIVE_ESB_SET_PQ_10); - else + xd->saved_p = false; + } else { xive_esb_read(xd, XIVE_ESB_SET_PQ_00); + xd->stale_p = false; + } } /* @@ -541,6 +560,8 @@ static unsigned int xive_irq_startup(struct irq_data *d) unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d); int target, rc; + xd->saved_p = false; + xd->stale_p = false; pr_devel("xive_irq_startup: irq %d [0x%x] data @%p\n", d->irq, hw_irq, d); @@ -587,6 +608,7 @@ static unsigned int xive_irq_startup(struct irq_data *d) return 0; } +/* called with irq descriptor lock held */ static void xive_irq_shutdown(struct irq_data *d) { struct xive_irq_data *xd = irq_data_get_irq_handler_data(d); @@ -601,16 +623,6 @@ static void xive_irq_shutdown(struct irq_data *d) /* Mask the interrupt at the source */ xive_do_source_set_mask(xd, true); - /* - * The above may have set saved_p. We clear it otherwise it - * will prevent re-enabling later on. It is ok to forget the - * fact that the interrupt might be in a queue because we are - * accounting that already in xive_dec_target_count() and will - * be re-routing it to a new queue with proper accounting when - * it's started up again - */ - xd->saved_p = false; - /* * Mask the interrupt in HW in the IVT/EAS and set the number * to be the "bad" IRQ number @@ -797,6 +809,10 @@ static int xive_irq_retrigger(struct irq_data *d) return 1; } +/* + * Caller holds the irq descriptor lock, so this won't be called + * concurrently with xive_get_irqchip_state on the same interrupt. + */ static int xive_irq_set_vcpu_affinity(struct irq_data *d, void *state) { struct xive_irq_data *xd = irq_data_get_irq_handler_data(d); @@ -820,6 +836,10 @@ static int xive_irq_set_vcpu_affinity(struct irq_data *d, void *state) /* Set it to PQ=10 state to prevent further sends */ pq = xive_esb_read(xd, XIVE_ESB_SET_PQ_10); + if (!xd->stale_p) { + xd->saved_p = !!(pq & XIVE_ESB_VAL_P); + xd->stale_p = !xd->saved_p; + } /* No target ? nothing to do */ if (xd->target == XIVE_INVALID_TARGET) { @@ -827,7 +847,7 @@ static int xive_irq_set_vcpu_affinity(struct irq_data *d, void *state) * An untargetted interrupt should have been * also masked at the source */ - WARN_ON(pq & 2); + WARN_ON(xd->saved_p); return 0; } @@ -847,9 +867,8 @@ static int xive_irq_set_vcpu_affinity(struct irq_data *d, void *state) * This saved_p is cleared by the host EOI, when we know * for sure the queue slot is no longer in use. */ - if (pq & 2) { - pq = xive_esb_read(xd, XIVE_ESB_SET_PQ_11); - xd->saved_p = true; + if (xd->saved_p) { + xive_esb_read(xd, XIVE_ESB_SET_PQ_11); /* * Sync the XIVE source HW to ensure the interrupt @@ -862,8 +881,7 @@ static int xive_irq_set_vcpu_affinity(struct irq_data *d, void *state) */ if (xive_ops->sync_source) xive_ops->sync_source(hw_irq); - } else - xd->saved_p = false; + } } else { irqd_clr_forwarded_to_vcpu(d); @@ -914,6 +932,23 @@ static int xive_irq_set_vcpu_affinity(struct irq_data *d, void *state) return 0; } +/* Called with irq descriptor lock held. */ +static int xive_get_irqchip_state(struct irq_data *data, + enum irqchip_irq_state which, bool *state) +{ + struct xive_irq_data *xd = irq_data_get_irq_handler_data(data); + + switch (which) { + case IRQCHIP_STATE_ACTIVE: + *state = !xd->stale_p && + (xd->saved_p || + !!(xive_esb_read(xd, XIVE_ESB_GET) & XIVE_ESB_VAL_P)); + return 0; + default: + return -EINVAL; + } +} + static struct irq_chip xive_irq_chip = { .name = "XIVE-IRQ", .irq_startup = xive_irq_startup, @@ -925,6 +960,7 @@ static struct irq_chip xive_irq_chip = { .irq_set_type = xive_irq_set_type, .irq_retrigger = xive_irq_retrigger, .irq_set_vcpu_affinity = xive_irq_set_vcpu_affinity, + .irq_get_irqchip_state = xive_get_irqchip_state, }; bool is_xive_irq(struct irq_chip *chip) @@ -1337,6 +1373,11 @@ static void xive_flush_cpu_queue(unsigned int cpu, struct xive_cpu *xc) raw_spin_lock(&desc->lock); xd = irq_desc_get_handler_data(desc); + /* + * Clear saved_p to indicate that it's no longer pending + */ + xd->saved_p = false; + /* * For LSIs, we EOI, this will cause a resend if it's * still asserted. Otherwise do an MSI retrigger.

5 years, 9 months

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FAILED: patch "[PATCH] powerpc/xive: Implement get_irqchip_state method for XIVE to" failed to apply to 4.19-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From da15c03b047dca891d37b9f4ef9ca14d84a6484f Mon Sep 17 00:00:00 2001 From: Paul Mackerras <paulus(a)ozlabs.org> Date: Tue, 13 Aug 2019 20:06:48 +1000 Subject: [PATCH] powerpc/xive: Implement get_irqchip_state method for XIVE to fix shutdown race Testing has revealed the existence of a race condition where a XIVE interrupt being shut down can be in one of the XIVE interrupt queues (of which there are up to 8 per CPU, one for each priority) at the point where free_irq() is called. If this happens, can return an interrupt number which has been shut down. This can lead to various symptoms: - irq_to_desc(irq) can be NULL. In this case, no end-of-interrupt function gets called, resulting in the CPU's elevated interrupt priority (numerically lowered CPPR) never gets reset. That then means that the CPU stops processing interrupts, causing device timeouts and other errors in various device drivers. - The irq descriptor or related data structures can be in the process of being freed as the interrupt code is using them. This typically leads to crashes due to bad pointer dereferences. This race is basically what commit 62e0468650c3 ("genirq: Add optional hardware synchronization for shutdown", 2019-06-28) is intended to fix, given a get_irqchip_state() method for the interrupt controller being used. It works by polling the interrupt controller when an interrupt is being freed until the controller says it is not pending. With XIVE, the PQ bits of the interrupt source indicate the state of the interrupt source, and in particular the P bit goes from 0 to 1 at the point where the hardware writes an entry into the interrupt queue that this interrupt is directed towards. Normally, the code will then process the interrupt and do an end-of-interrupt (EOI) operation which will reset PQ to 00 (assuming another interrupt hasn't been generated in the meantime). However, there are situations where the code resets P even though a queue entry exists (for example, by setting PQ to 01, which disables the interrupt source), and also situations where the code leaves P at 1 after removing the queue entry (for example, this is done for escalation interrupts so they cannot fire again until they are explicitly re-enabled). The code already has a 'saved_p' flag for the interrupt source which indicates that a queue entry exists, although it isn't maintained consistently. This patch adds a 'stale_p' flag to indicate that P has been left at 1 after processing a queue entry, and adds code to set and clear saved_p and stale_p as necessary to maintain a consistent indication of whether a queue entry may or may not exist. With this, we can implement xive_get_irqchip_state() by looking at stale_p, saved_p and the ESB PQ bits for the interrupt. There is some additional code to handle escalation interrupts properly; because they are enabled and disabled in KVM assembly code, which does not have access to the xive_irq_data struct for the escalation interrupt. Hence, stale_p may be incorrect when the escalation interrupt is freed in kvmppc_xive_{,native_}cleanup_vcpu(). Fortunately, we can fix it up by looking at vcpu->arch.xive_esc_on, with some careful attention to barriers in order to ensure the correct result if xive_esc_irq() races with kvmppc_xive_cleanup_vcpu(). Finally, this adds code to make noise on the console (pr_crit and WARN_ON(1)) if we find an interrupt queue entry for an interrupt which does not have a descriptor. While this won't catch the race reliably, if it does get triggered it will be an indication that the race is occurring and needs to be debugged. Fixes: 243e25112d06 ("powerpc/xive: Native exploitation of the XIVE interrupt controller") Cc: stable(a)vger.kernel.org # v4.12+ Signed-off-by: Paul Mackerras <paulus(a)ozlabs.org> Signed-off-by: Michael Ellerman <mpe(a)ellerman.id.au> Link: https://lore.kernel.org/r/20190813100648.GE9567@blackberry diff --git a/arch/powerpc/include/asm/xive.h b/arch/powerpc/include/asm/xive.h index e4016985764e..efb0e597b272 100644 --- a/arch/powerpc/include/asm/xive.h +++ b/arch/powerpc/include/asm/xive.h @@ -46,7 +46,15 @@ struct xive_irq_data { /* Setup/used by frontend */ int target; + /* + * saved_p means that there is a queue entry for this interrupt + * in some CPU's queue (not including guest vcpu queues), even + * if P is not set in the source ESB. + * stale_p means that there is no queue entry for this interrupt + * in some CPU's queue, even if P is set in the source ESB. + */ bool saved_p; + bool stale_p; }; #define XIVE_IRQ_FLAG_STORE_EOI 0x01 #define XIVE_IRQ_FLAG_LSI 0x02 diff --git a/arch/powerpc/kvm/book3s_xive.c b/arch/powerpc/kvm/book3s_xive.c index 586867e46e51..591bfb4bfd0f 100644 --- a/arch/powerpc/kvm/book3s_xive.c +++ b/arch/powerpc/kvm/book3s_xive.c @@ -166,6 +166,9 @@ static irqreturn_t xive_esc_irq(int irq, void *data) */ vcpu->arch.xive_esc_on = false; + /* This orders xive_esc_on = false vs. subsequent stale_p = true */ + smp_wmb(); /* goes with smp_mb() in cleanup_single_escalation */ + return IRQ_HANDLED; } @@ -1119,6 +1122,31 @@ void kvmppc_xive_disable_vcpu_interrupts(struct kvm_vcpu *vcpu) vcpu->arch.xive_esc_raddr = 0; } +/* + * In single escalation mode, the escalation interrupt is marked so + * that EOI doesn't re-enable it, but just sets the stale_p flag to + * indicate that the P bit has already been dealt with. However, the + * assembly code that enters the guest sets PQ to 00 without clearing + * stale_p (because it has no easy way to address it). Hence we have + * to adjust stale_p before shutting down the interrupt. + */ +void xive_cleanup_single_escalation(struct kvm_vcpu *vcpu, + struct kvmppc_xive_vcpu *xc, int irq) +{ + struct irq_data *d = irq_get_irq_data(irq); + struct xive_irq_data *xd = irq_data_get_irq_handler_data(d); + + /* + * This slightly odd sequence gives the right result + * (i.e. stale_p set if xive_esc_on is false) even if + * we race with xive_esc_irq() and xive_irq_eoi(). + */ + xd->stale_p = false; + smp_mb(); /* paired with smb_wmb in xive_esc_irq */ + if (!vcpu->arch.xive_esc_on) + xd->stale_p = true; +} + void kvmppc_xive_cleanup_vcpu(struct kvm_vcpu *vcpu) { struct kvmppc_xive_vcpu *xc = vcpu->arch.xive_vcpu; @@ -1143,6 +1171,9 @@ void kvmppc_xive_cleanup_vcpu(struct kvm_vcpu *vcpu) /* Free escalations */ for (i = 0; i < KVMPPC_XIVE_Q_COUNT; i++) { if (xc->esc_virq[i]) { + if (xc->xive->single_escalation) + xive_cleanup_single_escalation(vcpu, xc, + xc->esc_virq[i]); free_irq(xc->esc_virq[i], vcpu); irq_dispose_mapping(xc->esc_virq[i]); kfree(xc->esc_virq_names[i]); diff --git a/arch/powerpc/kvm/book3s_xive.h b/arch/powerpc/kvm/book3s_xive.h index 50494d0ee375..955b820ffd6d 100644 --- a/arch/powerpc/kvm/book3s_xive.h +++ b/arch/powerpc/kvm/book3s_xive.h @@ -282,6 +282,8 @@ int kvmppc_xive_select_target(struct kvm *kvm, u32 *server, u8 prio); int kvmppc_xive_attach_escalation(struct kvm_vcpu *vcpu, u8 prio, bool single_escalation); struct kvmppc_xive *kvmppc_xive_get_device(struct kvm *kvm, u32 type); +void xive_cleanup_single_escalation(struct kvm_vcpu *vcpu, + struct kvmppc_xive_vcpu *xc, int irq); #endif /* CONFIG_KVM_XICS */ #endif /* _KVM_PPC_BOOK3S_XICS_H */ diff --git a/arch/powerpc/kvm/book3s_xive_native.c b/arch/powerpc/kvm/book3s_xive_native.c index 11b91b46fc39..f0cab43e6f4b 100644 --- a/arch/powerpc/kvm/book3s_xive_native.c +++ b/arch/powerpc/kvm/book3s_xive_native.c @@ -71,6 +71,9 @@ void kvmppc_xive_native_cleanup_vcpu(struct kvm_vcpu *vcpu) for (i = 0; i < KVMPPC_XIVE_Q_COUNT; i++) { /* Free the escalation irq */ if (xc->esc_virq[i]) { + if (xc->xive->single_escalation) + xive_cleanup_single_escalation(vcpu, xc, + xc->esc_virq[i]); free_irq(xc->esc_virq[i], vcpu); irq_dispose_mapping(xc->esc_virq[i]); kfree(xc->esc_virq_names[i]); diff --git a/arch/powerpc/sysdev/xive/common.c b/arch/powerpc/sysdev/xive/common.c index 1cdb39575eae..be86fce1a84e 100644 --- a/arch/powerpc/sysdev/xive/common.c +++ b/arch/powerpc/sysdev/xive/common.c @@ -135,7 +135,7 @@ static u32 xive_read_eq(struct xive_q *q, bool just_peek) static u32 xive_scan_interrupts(struct xive_cpu *xc, bool just_peek) { u32 irq = 0; - u8 prio; + u8 prio = 0; /* Find highest pending priority */ while (xc->pending_prio != 0) { @@ -148,8 +148,19 @@ static u32 xive_scan_interrupts(struct xive_cpu *xc, bool just_peek) irq = xive_read_eq(&xc->queue[prio], just_peek); /* Found something ? That's it */ - if (irq) - break; + if (irq) { + if (just_peek || irq_to_desc(irq)) + break; + /* + * We should never get here; if we do then we must + * have failed to synchronize the interrupt properly + * when shutting it down. + */ + pr_crit("xive: got interrupt %d without descriptor, dropping\n", + irq); + WARN_ON(1); + continue; + } /* Clear pending bits */ xc->pending_prio &= ~(1 << prio); @@ -307,6 +318,7 @@ static void xive_do_queue_eoi(struct xive_cpu *xc) */ static void xive_do_source_eoi(u32 hw_irq, struct xive_irq_data *xd) { + xd->stale_p = false; /* If the XIVE supports the new "store EOI facility, use it */ if (xd->flags & XIVE_IRQ_FLAG_STORE_EOI) xive_esb_write(xd, XIVE_ESB_STORE_EOI, 0); @@ -350,7 +362,7 @@ static void xive_do_source_eoi(u32 hw_irq, struct xive_irq_data *xd) } } -/* irq_chip eoi callback */ +/* irq_chip eoi callback, called with irq descriptor lock held */ static void xive_irq_eoi(struct irq_data *d) { struct xive_irq_data *xd = irq_data_get_irq_handler_data(d); @@ -366,6 +378,8 @@ static void xive_irq_eoi(struct irq_data *d) if (!irqd_irq_disabled(d) && !irqd_is_forwarded_to_vcpu(d) && !(xd->flags & XIVE_IRQ_NO_EOI)) xive_do_source_eoi(irqd_to_hwirq(d), xd); + else + xd->stale_p = true; /* * Clear saved_p to indicate that it's no longer occupying @@ -397,11 +411,16 @@ static void xive_do_source_set_mask(struct xive_irq_data *xd, */ if (mask) { val = xive_esb_read(xd, XIVE_ESB_SET_PQ_01); - xd->saved_p = !!(val & XIVE_ESB_VAL_P); - } else if (xd->saved_p) + if (!xd->stale_p && !!(val & XIVE_ESB_VAL_P)) + xd->saved_p = true; + xd->stale_p = false; + } else if (xd->saved_p) { xive_esb_read(xd, XIVE_ESB_SET_PQ_10); - else + xd->saved_p = false; + } else { xive_esb_read(xd, XIVE_ESB_SET_PQ_00); + xd->stale_p = false; + } } /* @@ -541,6 +560,8 @@ static unsigned int xive_irq_startup(struct irq_data *d) unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d); int target, rc; + xd->saved_p = false; + xd->stale_p = false; pr_devel("xive_irq_startup: irq %d [0x%x] data @%p\n", d->irq, hw_irq, d); @@ -587,6 +608,7 @@ static unsigned int xive_irq_startup(struct irq_data *d) return 0; } +/* called with irq descriptor lock held */ static void xive_irq_shutdown(struct irq_data *d) { struct xive_irq_data *xd = irq_data_get_irq_handler_data(d); @@ -601,16 +623,6 @@ static void xive_irq_shutdown(struct irq_data *d) /* Mask the interrupt at the source */ xive_do_source_set_mask(xd, true); - /* - * The above may have set saved_p. We clear it otherwise it - * will prevent re-enabling later on. It is ok to forget the - * fact that the interrupt might be in a queue because we are - * accounting that already in xive_dec_target_count() and will - * be re-routing it to a new queue with proper accounting when - * it's started up again - */ - xd->saved_p = false; - /* * Mask the interrupt in HW in the IVT/EAS and set the number * to be the "bad" IRQ number @@ -797,6 +809,10 @@ static int xive_irq_retrigger(struct irq_data *d) return 1; } +/* + * Caller holds the irq descriptor lock, so this won't be called + * concurrently with xive_get_irqchip_state on the same interrupt. + */ static int xive_irq_set_vcpu_affinity(struct irq_data *d, void *state) { struct xive_irq_data *xd = irq_data_get_irq_handler_data(d); @@ -820,6 +836,10 @@ static int xive_irq_set_vcpu_affinity(struct irq_data *d, void *state) /* Set it to PQ=10 state to prevent further sends */ pq = xive_esb_read(xd, XIVE_ESB_SET_PQ_10); + if (!xd->stale_p) { + xd->saved_p = !!(pq & XIVE_ESB_VAL_P); + xd->stale_p = !xd->saved_p; + } /* No target ? nothing to do */ if (xd->target == XIVE_INVALID_TARGET) { @@ -827,7 +847,7 @@ static int xive_irq_set_vcpu_affinity(struct irq_data *d, void *state) * An untargetted interrupt should have been * also masked at the source */ - WARN_ON(pq & 2); + WARN_ON(xd->saved_p); return 0; } @@ -847,9 +867,8 @@ static int xive_irq_set_vcpu_affinity(struct irq_data *d, void *state) * This saved_p is cleared by the host EOI, when we know * for sure the queue slot is no longer in use. */ - if (pq & 2) { - pq = xive_esb_read(xd, XIVE_ESB_SET_PQ_11); - xd->saved_p = true; + if (xd->saved_p) { + xive_esb_read(xd, XIVE_ESB_SET_PQ_11); /* * Sync the XIVE source HW to ensure the interrupt @@ -862,8 +881,7 @@ static int xive_irq_set_vcpu_affinity(struct irq_data *d, void *state) */ if (xive_ops->sync_source) xive_ops->sync_source(hw_irq); - } else - xd->saved_p = false; + } } else { irqd_clr_forwarded_to_vcpu(d); @@ -914,6 +932,23 @@ static int xive_irq_set_vcpu_affinity(struct irq_data *d, void *state) return 0; } +/* Called with irq descriptor lock held. */ +static int xive_get_irqchip_state(struct irq_data *data, + enum irqchip_irq_state which, bool *state) +{ + struct xive_irq_data *xd = irq_data_get_irq_handler_data(data); + + switch (which) { + case IRQCHIP_STATE_ACTIVE: + *state = !xd->stale_p && + (xd->saved_p || + !!(xive_esb_read(xd, XIVE_ESB_GET) & XIVE_ESB_VAL_P)); + return 0; + default: + return -EINVAL; + } +} + static struct irq_chip xive_irq_chip = { .name = "XIVE-IRQ", .irq_startup = xive_irq_startup, @@ -925,6 +960,7 @@ static struct irq_chip xive_irq_chip = { .irq_set_type = xive_irq_set_type, .irq_retrigger = xive_irq_retrigger, .irq_set_vcpu_affinity = xive_irq_set_vcpu_affinity, + .irq_get_irqchip_state = xive_get_irqchip_state, }; bool is_xive_irq(struct irq_chip *chip) @@ -1337,6 +1373,11 @@ static void xive_flush_cpu_queue(unsigned int cpu, struct xive_cpu *xc) raw_spin_lock(&desc->lock); xd = irq_desc_get_handler_data(desc); + /* + * Clear saved_p to indicate that it's no longer pending + */ + xd->saved_p = false; + /* * For LSIs, we EOI, this will cause a resend if it's * still asserted. Otherwise do an MSI retrigger.

5 years, 9 months

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FAILED: patch "[PATCH] ASoC: sgtl5000: Improve VAG power and mute control" failed to apply to 4.4-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From b1f373a11d25fc9a5f7679c9b85799fe09b0dc4a Mon Sep 17 00:00:00 2001 From: Oleksandr Suvorov <oleksandr.suvorov(a)toradex.com> Date: Fri, 19 Jul 2019 10:05:31 +0000 Subject: [PATCH] ASoC: sgtl5000: Improve VAG power and mute control VAG power control is improved to fit the manual [1]. This patch fixes as minimum one bug: if customer muxes Headphone to Line-In right after boot, the VAG power remains off that leads to poor sound quality from line-in. I.e. after boot: - Connect sound source to Line-In jack; - Connect headphone to HP jack; - Run following commands: $ amixer set 'Headphone' 80% $ amixer set 'Headphone Mux' LINE_IN Change VAG power on/off control according to the following algorithm: - turn VAG power ON on the 1st incoming event. - keep it ON if there is any active VAG consumer (ADC/DAC/HP/Line-In). - turn VAG power OFF when there is the latest consumer's pre-down event come. - always delay after VAG power OFF to avoid pop. - delay after VAG power ON if the initiative consumer is Line-In, this prevents pop during line-in muxing. According to the data sheet [1], to avoid any pops/clicks, the outputs should be muted during input/output routing changes. [1] https://www.nxp.com/docs/en/data-sheet/SGTL5000.pdf Cc: stable(a)vger.kernel.org Fixes: 9b34e6cc3bc2 ("ASoC: Add Freescale SGTL5000 codec support") Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov(a)toradex.com> Reviewed-by: Marcel Ziswiler <marcel.ziswiler(a)toradex.com> Reviewed-by: Fabio Estevam <festevam(a)gmail.com> Reviewed-by: Cezary Rojewski <cezary.rojewski(a)intel.com> Link: https://lore.kernel.org/r/20190719100524.23300-3-oleksandr.suvorov@toradex.… Signed-off-by: Mark Brown <broonie(a)kernel.org> diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c index a6a4748c97f9..34cc85e49003 100644 --- a/sound/soc/codecs/sgtl5000.c +++ b/sound/soc/codecs/sgtl5000.c @@ -31,6 +31,13 @@ #define SGTL5000_DAP_REG_OFFSET 0x0100 #define SGTL5000_MAX_REG_OFFSET 0x013A +/* Delay for the VAG ramp up */ +#define SGTL5000_VAG_POWERUP_DELAY 500 /* ms */ +/* Delay for the VAG ramp down */ +#define SGTL5000_VAG_POWERDOWN_DELAY 500 /* ms */ + +#define SGTL5000_OUTPUTS_MUTE (SGTL5000_HP_MUTE | SGTL5000_LINE_OUT_MUTE) + /* default value of sgtl5000 registers */ static const struct reg_default sgtl5000_reg_defaults[] = { { SGTL5000_CHIP_DIG_POWER, 0x0000 }, @@ -123,6 +130,13 @@ enum { I2S_SCLK_STRENGTH_HIGH, }; +enum { + HP_POWER_EVENT, + DAC_POWER_EVENT, + ADC_POWER_EVENT, + LAST_POWER_EVENT = ADC_POWER_EVENT +}; + /* sgtl5000 private structure in codec */ struct sgtl5000_priv { int sysclk; /* sysclk rate */ @@ -137,8 +151,109 @@ struct sgtl5000_priv { u8 micbias_voltage; u8 lrclk_strength; u8 sclk_strength; + u16 mute_state[LAST_POWER_EVENT + 1]; }; +static inline int hp_sel_input(struct snd_soc_component *component) +{ + return (snd_soc_component_read32(component, SGTL5000_CHIP_ANA_CTRL) & + SGTL5000_HP_SEL_MASK) >> SGTL5000_HP_SEL_SHIFT; +} + +static inline u16 mute_output(struct snd_soc_component *component, + u16 mute_mask) +{ + u16 mute_reg = snd_soc_component_read32(component, + SGTL5000_CHIP_ANA_CTRL); + + snd_soc_component_update_bits(component, SGTL5000_CHIP_ANA_CTRL, + mute_mask, mute_mask); + return mute_reg; +} + +static inline void restore_output(struct snd_soc_component *component, + u16 mute_mask, u16 mute_reg) +{ + snd_soc_component_update_bits(component, SGTL5000_CHIP_ANA_CTRL, + mute_mask, mute_reg); +} + +static void vag_power_on(struct snd_soc_component *component, u32 source) +{ + if (snd_soc_component_read32(component, SGTL5000_CHIP_ANA_POWER) & + SGTL5000_VAG_POWERUP) + return; + + snd_soc_component_update_bits(component, SGTL5000_CHIP_ANA_POWER, + SGTL5000_VAG_POWERUP, SGTL5000_VAG_POWERUP); + + /* When VAG powering on to get local loop from Line-In, the sleep + * is required to avoid loud pop. + */ + if (hp_sel_input(component) == SGTL5000_HP_SEL_LINE_IN && + source == HP_POWER_EVENT) + msleep(SGTL5000_VAG_POWERUP_DELAY); +} + +static int vag_power_consumers(struct snd_soc_component *component, + u16 ana_pwr_reg, u32 source) +{ + int consumers = 0; + + /* count dac/adc consumers unconditional */ + if (ana_pwr_reg & SGTL5000_DAC_POWERUP) + consumers++; + if (ana_pwr_reg & SGTL5000_ADC_POWERUP) + consumers++; + + /* + * If the event comes from HP and Line-In is selected, + * current action is 'DAC to be powered down'. + * As HP_POWERUP is not set when HP muxed to line-in, + * we need to keep VAG power ON. + */ + if (source == HP_POWER_EVENT) { + if (hp_sel_input(component) == SGTL5000_HP_SEL_LINE_IN) + consumers++; + } else { + if (ana_pwr_reg & SGTL5000_HP_POWERUP) + consumers++; + } + + return consumers; +} + +static void vag_power_off(struct snd_soc_component *component, u32 source) +{ + u16 ana_pwr = snd_soc_component_read32(component, + SGTL5000_CHIP_ANA_POWER); + + if (!(ana_pwr & SGTL5000_VAG_POWERUP)) + return; + + /* + * This function calls when any of VAG power consumers is disappearing. + * Thus, if there is more than one consumer at the moment, as minimum + * one consumer will definitely stay after the end of the current + * event. + * Don't clear VAG_POWERUP if 2 or more consumers of VAG present: + * - LINE_IN (for HP events) / HP (for DAC/ADC events) + * - DAC + * - ADC + * (the current consumer is disappearing right now) + */ + if (vag_power_consumers(component, ana_pwr, source) >= 2) + return; + + snd_soc_component_update_bits(component, SGTL5000_CHIP_ANA_POWER, + SGTL5000_VAG_POWERUP, 0); + /* In power down case, we need wait 400-1000 ms + * when VAG fully ramped down. + * As longer we wait, as smaller pop we've got. + */ + msleep(SGTL5000_VAG_POWERDOWN_DELAY); +} + /* * mic_bias power on/off share the same register bits with * output impedance of mic bias, when power on mic bias, we @@ -170,36 +285,46 @@ static int mic_bias_event(struct snd_soc_dapm_widget *w, return 0; } -/* - * As manual described, ADC/DAC only works when VAG powerup, - * So enabled VAG before ADC/DAC up. - * In power down case, we need wait 400ms when vag fully ramped down. - */ -static int power_vag_event(struct snd_soc_dapm_widget *w, - struct snd_kcontrol *kcontrol, int event) +static int vag_and_mute_control(struct snd_soc_component *component, + int event, int event_source) { - struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm); - const u32 mask = SGTL5000_DAC_POWERUP | SGTL5000_ADC_POWERUP; + static const u16 mute_mask[] = { + /* + * Mask for HP_POWER_EVENT. + * Muxing Headphones have to be wrapped with mute/unmute + * headphones only. + */ + SGTL5000_HP_MUTE, + /* + * Masks for DAC_POWER_EVENT/ADC_POWER_EVENT. + * Muxing DAC or ADC block have to wrapped with mute/unmute + * both headphones and line-out. + */ + SGTL5000_OUTPUTS_MUTE, + SGTL5000_OUTPUTS_MUTE + }; + + struct sgtl5000_priv *sgtl5000 = + snd_soc_component_get_drvdata(component); switch (event) { + case SND_SOC_DAPM_PRE_PMU: + sgtl5000->mute_state[event_source] = + mute_output(component, mute_mask[event_source]); + break; case SND_SOC_DAPM_POST_PMU: - snd_soc_component_update_bits(component, SGTL5000_CHIP_ANA_POWER, - SGTL5000_VAG_POWERUP, SGTL5000_VAG_POWERUP); - msleep(400); + vag_power_on(component, event_source); + restore_output(component, mute_mask[event_source], + sgtl5000->mute_state[event_source]); break; - case SND_SOC_DAPM_PRE_PMD: - /* - * Don't clear VAG_POWERUP, when both DAC and ADC are - * operational to prevent inadvertently starving the - * other one of them. - */ - if ((snd_soc_component_read32(component, SGTL5000_CHIP_ANA_POWER) & - mask) != mask) { - snd_soc_component_update_bits(component, SGTL5000_CHIP_ANA_POWER, - SGTL5000_VAG_POWERUP, 0); - msleep(400); - } + sgtl5000->mute_state[event_source] = + mute_output(component, mute_mask[event_source]); + vag_power_off(component, event_source); + break; + case SND_SOC_DAPM_POST_PMD: + restore_output(component, mute_mask[event_source], + sgtl5000->mute_state[event_source]); break; default: break; @@ -208,6 +333,41 @@ static int power_vag_event(struct snd_soc_dapm_widget *w, return 0; } +/* + * Mute Headphone when power it up/down. + * Control VAG power on HP power path. + */ +static int headphone_pga_event(struct snd_soc_dapm_widget *w, + struct snd_kcontrol *kcontrol, int event) +{ + struct snd_soc_component *component = + snd_soc_dapm_to_component(w->dapm); + + return vag_and_mute_control(component, event, HP_POWER_EVENT); +} + +/* As manual describes, ADC/DAC powering up/down requires + * to mute outputs to avoid pops. + * Control VAG power on ADC/DAC power path. + */ +static int adc_updown_depop(struct snd_soc_dapm_widget *w, + struct snd_kcontrol *kcontrol, int event) +{ + struct snd_soc_component *component = + snd_soc_dapm_to_component(w->dapm); + + return vag_and_mute_control(component, event, ADC_POWER_EVENT); +} + +static int dac_updown_depop(struct snd_soc_dapm_widget *w, + struct snd_kcontrol *kcontrol, int event) +{ + struct snd_soc_component *component = + snd_soc_dapm_to_component(w->dapm); + + return vag_and_mute_control(component, event, DAC_POWER_EVENT); +} + /* input sources for ADC */ static const char *adc_mux_text[] = { "MIC_IN", "LINE_IN" @@ -280,7 +440,10 @@ static const struct snd_soc_dapm_widget sgtl5000_dapm_widgets[] = { mic_bias_event, SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD), - SND_SOC_DAPM_PGA("HP", SGTL5000_CHIP_ANA_POWER, 4, 0, NULL, 0), + SND_SOC_DAPM_PGA_E("HP", SGTL5000_CHIP_ANA_POWER, 4, 0, NULL, 0, + headphone_pga_event, + SND_SOC_DAPM_PRE_POST_PMU | + SND_SOC_DAPM_PRE_POST_PMD), SND_SOC_DAPM_PGA("LO", SGTL5000_CHIP_ANA_POWER, 0, 0, NULL, 0), SND_SOC_DAPM_MUX("Capture Mux", SND_SOC_NOPM, 0, 0, &adc_mux), @@ -301,11 +464,12 @@ static const struct snd_soc_dapm_widget sgtl5000_dapm_widgets[] = { 0, SGTL5000_CHIP_DIG_POWER, 1, 0), - SND_SOC_DAPM_ADC("ADC", "Capture", SGTL5000_CHIP_ANA_POWER, 1, 0), - SND_SOC_DAPM_DAC("DAC", "Playback", SGTL5000_CHIP_ANA_POWER, 3, 0), - - SND_SOC_DAPM_PRE("VAG_POWER_PRE", power_vag_event), - SND_SOC_DAPM_POST("VAG_POWER_POST", power_vag_event), + SND_SOC_DAPM_ADC_E("ADC", "Capture", SGTL5000_CHIP_ANA_POWER, 1, 0, + adc_updown_depop, SND_SOC_DAPM_PRE_POST_PMU | + SND_SOC_DAPM_PRE_POST_PMD), + SND_SOC_DAPM_DAC_E("DAC", "Playback", SGTL5000_CHIP_ANA_POWER, 3, 0, + dac_updown_depop, SND_SOC_DAPM_PRE_POST_PMU | + SND_SOC_DAPM_PRE_POST_PMD), }; /* routes for sgtl5000 */

5 years, 9 months

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FAILED: patch "[PATCH] ASoC: sgtl5000: Improve VAG power and mute control" failed to apply to 4.9-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From b1f373a11d25fc9a5f7679c9b85799fe09b0dc4a Mon Sep 17 00:00:00 2001 From: Oleksandr Suvorov <oleksandr.suvorov(a)toradex.com> Date: Fri, 19 Jul 2019 10:05:31 +0000 Subject: [PATCH] ASoC: sgtl5000: Improve VAG power and mute control VAG power control is improved to fit the manual [1]. This patch fixes as minimum one bug: if customer muxes Headphone to Line-In right after boot, the VAG power remains off that leads to poor sound quality from line-in. I.e. after boot: - Connect sound source to Line-In jack; - Connect headphone to HP jack; - Run following commands: $ amixer set 'Headphone' 80% $ amixer set 'Headphone Mux' LINE_IN Change VAG power on/off control according to the following algorithm: - turn VAG power ON on the 1st incoming event. - keep it ON if there is any active VAG consumer (ADC/DAC/HP/Line-In). - turn VAG power OFF when there is the latest consumer's pre-down event come. - always delay after VAG power OFF to avoid pop. - delay after VAG power ON if the initiative consumer is Line-In, this prevents pop during line-in muxing. According to the data sheet [1], to avoid any pops/clicks, the outputs should be muted during input/output routing changes. [1] https://www.nxp.com/docs/en/data-sheet/SGTL5000.pdf Cc: stable(a)vger.kernel.org Fixes: 9b34e6cc3bc2 ("ASoC: Add Freescale SGTL5000 codec support") Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov(a)toradex.com> Reviewed-by: Marcel Ziswiler <marcel.ziswiler(a)toradex.com> Reviewed-by: Fabio Estevam <festevam(a)gmail.com> Reviewed-by: Cezary Rojewski <cezary.rojewski(a)intel.com> Link: https://lore.kernel.org/r/20190719100524.23300-3-oleksandr.suvorov@toradex.… Signed-off-by: Mark Brown <broonie(a)kernel.org> diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c index a6a4748c97f9..34cc85e49003 100644 --- a/sound/soc/codecs/sgtl5000.c +++ b/sound/soc/codecs/sgtl5000.c @@ -31,6 +31,13 @@ #define SGTL5000_DAP_REG_OFFSET 0x0100 #define SGTL5000_MAX_REG_OFFSET 0x013A +/* Delay for the VAG ramp up */ +#define SGTL5000_VAG_POWERUP_DELAY 500 /* ms */ +/* Delay for the VAG ramp down */ +#define SGTL5000_VAG_POWERDOWN_DELAY 500 /* ms */ + +#define SGTL5000_OUTPUTS_MUTE (SGTL5000_HP_MUTE | SGTL5000_LINE_OUT_MUTE) + /* default value of sgtl5000 registers */ static const struct reg_default sgtl5000_reg_defaults[] = { { SGTL5000_CHIP_DIG_POWER, 0x0000 }, @@ -123,6 +130,13 @@ enum { I2S_SCLK_STRENGTH_HIGH, }; +enum { + HP_POWER_EVENT, + DAC_POWER_EVENT, + ADC_POWER_EVENT, + LAST_POWER_EVENT = ADC_POWER_EVENT +}; + /* sgtl5000 private structure in codec */ struct sgtl5000_priv { int sysclk; /* sysclk rate */ @@ -137,8 +151,109 @@ struct sgtl5000_priv { u8 micbias_voltage; u8 lrclk_strength; u8 sclk_strength; + u16 mute_state[LAST_POWER_EVENT + 1]; }; +static inline int hp_sel_input(struct snd_soc_component *component) +{ + return (snd_soc_component_read32(component, SGTL5000_CHIP_ANA_CTRL) & + SGTL5000_HP_SEL_MASK) >> SGTL5000_HP_SEL_SHIFT; +} + +static inline u16 mute_output(struct snd_soc_component *component, + u16 mute_mask) +{ + u16 mute_reg = snd_soc_component_read32(component, + SGTL5000_CHIP_ANA_CTRL); + + snd_soc_component_update_bits(component, SGTL5000_CHIP_ANA_CTRL, + mute_mask, mute_mask); + return mute_reg; +} + +static inline void restore_output(struct snd_soc_component *component, + u16 mute_mask, u16 mute_reg) +{ + snd_soc_component_update_bits(component, SGTL5000_CHIP_ANA_CTRL, + mute_mask, mute_reg); +} + +static void vag_power_on(struct snd_soc_component *component, u32 source) +{ + if (snd_soc_component_read32(component, SGTL5000_CHIP_ANA_POWER) & + SGTL5000_VAG_POWERUP) + return; + + snd_soc_component_update_bits(component, SGTL5000_CHIP_ANA_POWER, + SGTL5000_VAG_POWERUP, SGTL5000_VAG_POWERUP); + + /* When VAG powering on to get local loop from Line-In, the sleep + * is required to avoid loud pop. + */ + if (hp_sel_input(component) == SGTL5000_HP_SEL_LINE_IN && + source == HP_POWER_EVENT) + msleep(SGTL5000_VAG_POWERUP_DELAY); +} + +static int vag_power_consumers(struct snd_soc_component *component, + u16 ana_pwr_reg, u32 source) +{ + int consumers = 0; + + /* count dac/adc consumers unconditional */ + if (ana_pwr_reg & SGTL5000_DAC_POWERUP) + consumers++; + if (ana_pwr_reg & SGTL5000_ADC_POWERUP) + consumers++; + + /* + * If the event comes from HP and Line-In is selected, + * current action is 'DAC to be powered down'. + * As HP_POWERUP is not set when HP muxed to line-in, + * we need to keep VAG power ON. + */ + if (source == HP_POWER_EVENT) { + if (hp_sel_input(component) == SGTL5000_HP_SEL_LINE_IN) + consumers++; + } else { + if (ana_pwr_reg & SGTL5000_HP_POWERUP) + consumers++; + } + + return consumers; +} + +static void vag_power_off(struct snd_soc_component *component, u32 source) +{ + u16 ana_pwr = snd_soc_component_read32(component, + SGTL5000_CHIP_ANA_POWER); + + if (!(ana_pwr & SGTL5000_VAG_POWERUP)) + return; + + /* + * This function calls when any of VAG power consumers is disappearing. + * Thus, if there is more than one consumer at the moment, as minimum + * one consumer will definitely stay after the end of the current + * event. + * Don't clear VAG_POWERUP if 2 or more consumers of VAG present: + * - LINE_IN (for HP events) / HP (for DAC/ADC events) + * - DAC + * - ADC + * (the current consumer is disappearing right now) + */ + if (vag_power_consumers(component, ana_pwr, source) >= 2) + return; + + snd_soc_component_update_bits(component, SGTL5000_CHIP_ANA_POWER, + SGTL5000_VAG_POWERUP, 0); + /* In power down case, we need wait 400-1000 ms + * when VAG fully ramped down. + * As longer we wait, as smaller pop we've got. + */ + msleep(SGTL5000_VAG_POWERDOWN_DELAY); +} + /* * mic_bias power on/off share the same register bits with * output impedance of mic bias, when power on mic bias, we @@ -170,36 +285,46 @@ static int mic_bias_event(struct snd_soc_dapm_widget *w, return 0; } -/* - * As manual described, ADC/DAC only works when VAG powerup, - * So enabled VAG before ADC/DAC up. - * In power down case, we need wait 400ms when vag fully ramped down. - */ -static int power_vag_event(struct snd_soc_dapm_widget *w, - struct snd_kcontrol *kcontrol, int event) +static int vag_and_mute_control(struct snd_soc_component *component, + int event, int event_source) { - struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm); - const u32 mask = SGTL5000_DAC_POWERUP | SGTL5000_ADC_POWERUP; + static const u16 mute_mask[] = { + /* + * Mask for HP_POWER_EVENT. + * Muxing Headphones have to be wrapped with mute/unmute + * headphones only. + */ + SGTL5000_HP_MUTE, + /* + * Masks for DAC_POWER_EVENT/ADC_POWER_EVENT. + * Muxing DAC or ADC block have to wrapped with mute/unmute + * both headphones and line-out. + */ + SGTL5000_OUTPUTS_MUTE, + SGTL5000_OUTPUTS_MUTE + }; + + struct sgtl5000_priv *sgtl5000 = + snd_soc_component_get_drvdata(component); switch (event) { + case SND_SOC_DAPM_PRE_PMU: + sgtl5000->mute_state[event_source] = + mute_output(component, mute_mask[event_source]); + break; case SND_SOC_DAPM_POST_PMU: - snd_soc_component_update_bits(component, SGTL5000_CHIP_ANA_POWER, - SGTL5000_VAG_POWERUP, SGTL5000_VAG_POWERUP); - msleep(400); + vag_power_on(component, event_source); + restore_output(component, mute_mask[event_source], + sgtl5000->mute_state[event_source]); break; - case SND_SOC_DAPM_PRE_PMD: - /* - * Don't clear VAG_POWERUP, when both DAC and ADC are - * operational to prevent inadvertently starving the - * other one of them. - */ - if ((snd_soc_component_read32(component, SGTL5000_CHIP_ANA_POWER) & - mask) != mask) { - snd_soc_component_update_bits(component, SGTL5000_CHIP_ANA_POWER, - SGTL5000_VAG_POWERUP, 0); - msleep(400); - } + sgtl5000->mute_state[event_source] = + mute_output(component, mute_mask[event_source]); + vag_power_off(component, event_source); + break; + case SND_SOC_DAPM_POST_PMD: + restore_output(component, mute_mask[event_source], + sgtl5000->mute_state[event_source]); break; default: break; @@ -208,6 +333,41 @@ static int power_vag_event(struct snd_soc_dapm_widget *w, return 0; } +/* + * Mute Headphone when power it up/down. + * Control VAG power on HP power path. + */ +static int headphone_pga_event(struct snd_soc_dapm_widget *w, + struct snd_kcontrol *kcontrol, int event) +{ + struct snd_soc_component *component = + snd_soc_dapm_to_component(w->dapm); + + return vag_and_mute_control(component, event, HP_POWER_EVENT); +} + +/* As manual describes, ADC/DAC powering up/down requires + * to mute outputs to avoid pops. + * Control VAG power on ADC/DAC power path. + */ +static int adc_updown_depop(struct snd_soc_dapm_widget *w, + struct snd_kcontrol *kcontrol, int event) +{ + struct snd_soc_component *component = + snd_soc_dapm_to_component(w->dapm); + + return vag_and_mute_control(component, event, ADC_POWER_EVENT); +} + +static int dac_updown_depop(struct snd_soc_dapm_widget *w, + struct snd_kcontrol *kcontrol, int event) +{ + struct snd_soc_component *component = + snd_soc_dapm_to_component(w->dapm); + + return vag_and_mute_control(component, event, DAC_POWER_EVENT); +} + /* input sources for ADC */ static const char *adc_mux_text[] = { "MIC_IN", "LINE_IN" @@ -280,7 +440,10 @@ static const struct snd_soc_dapm_widget sgtl5000_dapm_widgets[] = { mic_bias_event, SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD), - SND_SOC_DAPM_PGA("HP", SGTL5000_CHIP_ANA_POWER, 4, 0, NULL, 0), + SND_SOC_DAPM_PGA_E("HP", SGTL5000_CHIP_ANA_POWER, 4, 0, NULL, 0, + headphone_pga_event, + SND_SOC_DAPM_PRE_POST_PMU | + SND_SOC_DAPM_PRE_POST_PMD), SND_SOC_DAPM_PGA("LO", SGTL5000_CHIP_ANA_POWER, 0, 0, NULL, 0), SND_SOC_DAPM_MUX("Capture Mux", SND_SOC_NOPM, 0, 0, &adc_mux), @@ -301,11 +464,12 @@ static const struct snd_soc_dapm_widget sgtl5000_dapm_widgets[] = { 0, SGTL5000_CHIP_DIG_POWER, 1, 0), - SND_SOC_DAPM_ADC("ADC", "Capture", SGTL5000_CHIP_ANA_POWER, 1, 0), - SND_SOC_DAPM_DAC("DAC", "Playback", SGTL5000_CHIP_ANA_POWER, 3, 0), - - SND_SOC_DAPM_PRE("VAG_POWER_PRE", power_vag_event), - SND_SOC_DAPM_POST("VAG_POWER_POST", power_vag_event), + SND_SOC_DAPM_ADC_E("ADC", "Capture", SGTL5000_CHIP_ANA_POWER, 1, 0, + adc_updown_depop, SND_SOC_DAPM_PRE_POST_PMU | + SND_SOC_DAPM_PRE_POST_PMD), + SND_SOC_DAPM_DAC_E("DAC", "Playback", SGTL5000_CHIP_ANA_POWER, 3, 0, + dac_updown_depop, SND_SOC_DAPM_PRE_POST_PMU | + SND_SOC_DAPM_PRE_POST_PMD), }; /* routes for sgtl5000 */

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FAILED: patch "[PATCH] ASoC: sgtl5000: Improve VAG power and mute control" failed to apply to 4.14-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From b1f373a11d25fc9a5f7679c9b85799fe09b0dc4a Mon Sep 17 00:00:00 2001 From: Oleksandr Suvorov <oleksandr.suvorov(a)toradex.com> Date: Fri, 19 Jul 2019 10:05:31 +0000 Subject: [PATCH] ASoC: sgtl5000: Improve VAG power and mute control VAG power control is improved to fit the manual [1]. This patch fixes as minimum one bug: if customer muxes Headphone to Line-In right after boot, the VAG power remains off that leads to poor sound quality from line-in. I.e. after boot: - Connect sound source to Line-In jack; - Connect headphone to HP jack; - Run following commands: $ amixer set 'Headphone' 80% $ amixer set 'Headphone Mux' LINE_IN Change VAG power on/off control according to the following algorithm: - turn VAG power ON on the 1st incoming event. - keep it ON if there is any active VAG consumer (ADC/DAC/HP/Line-In). - turn VAG power OFF when there is the latest consumer's pre-down event come. - always delay after VAG power OFF to avoid pop. - delay after VAG power ON if the initiative consumer is Line-In, this prevents pop during line-in muxing. According to the data sheet [1], to avoid any pops/clicks, the outputs should be muted during input/output routing changes. [1] https://www.nxp.com/docs/en/data-sheet/SGTL5000.pdf Cc: stable(a)vger.kernel.org Fixes: 9b34e6cc3bc2 ("ASoC: Add Freescale SGTL5000 codec support") Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov(a)toradex.com> Reviewed-by: Marcel Ziswiler <marcel.ziswiler(a)toradex.com> Reviewed-by: Fabio Estevam <festevam(a)gmail.com> Reviewed-by: Cezary Rojewski <cezary.rojewski(a)intel.com> Link: https://lore.kernel.org/r/20190719100524.23300-3-oleksandr.suvorov@toradex.… Signed-off-by: Mark Brown <broonie(a)kernel.org> diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c index a6a4748c97f9..34cc85e49003 100644 --- a/sound/soc/codecs/sgtl5000.c +++ b/sound/soc/codecs/sgtl5000.c @@ -31,6 +31,13 @@ #define SGTL5000_DAP_REG_OFFSET 0x0100 #define SGTL5000_MAX_REG_OFFSET 0x013A +/* Delay for the VAG ramp up */ +#define SGTL5000_VAG_POWERUP_DELAY 500 /* ms */ +/* Delay for the VAG ramp down */ +#define SGTL5000_VAG_POWERDOWN_DELAY 500 /* ms */ + +#define SGTL5000_OUTPUTS_MUTE (SGTL5000_HP_MUTE | SGTL5000_LINE_OUT_MUTE) + /* default value of sgtl5000 registers */ static const struct reg_default sgtl5000_reg_defaults[] = { { SGTL5000_CHIP_DIG_POWER, 0x0000 }, @@ -123,6 +130,13 @@ enum { I2S_SCLK_STRENGTH_HIGH, }; +enum { + HP_POWER_EVENT, + DAC_POWER_EVENT, + ADC_POWER_EVENT, + LAST_POWER_EVENT = ADC_POWER_EVENT +}; + /* sgtl5000 private structure in codec */ struct sgtl5000_priv { int sysclk; /* sysclk rate */ @@ -137,8 +151,109 @@ struct sgtl5000_priv { u8 micbias_voltage; u8 lrclk_strength; u8 sclk_strength; + u16 mute_state[LAST_POWER_EVENT + 1]; }; +static inline int hp_sel_input(struct snd_soc_component *component) +{ + return (snd_soc_component_read32(component, SGTL5000_CHIP_ANA_CTRL) & + SGTL5000_HP_SEL_MASK) >> SGTL5000_HP_SEL_SHIFT; +} + +static inline u16 mute_output(struct snd_soc_component *component, + u16 mute_mask) +{ + u16 mute_reg = snd_soc_component_read32(component, + SGTL5000_CHIP_ANA_CTRL); + + snd_soc_component_update_bits(component, SGTL5000_CHIP_ANA_CTRL, + mute_mask, mute_mask); + return mute_reg; +} + +static inline void restore_output(struct snd_soc_component *component, + u16 mute_mask, u16 mute_reg) +{ + snd_soc_component_update_bits(component, SGTL5000_CHIP_ANA_CTRL, + mute_mask, mute_reg); +} + +static void vag_power_on(struct snd_soc_component *component, u32 source) +{ + if (snd_soc_component_read32(component, SGTL5000_CHIP_ANA_POWER) & + SGTL5000_VAG_POWERUP) + return; + + snd_soc_component_update_bits(component, SGTL5000_CHIP_ANA_POWER, + SGTL5000_VAG_POWERUP, SGTL5000_VAG_POWERUP); + + /* When VAG powering on to get local loop from Line-In, the sleep + * is required to avoid loud pop. + */ + if (hp_sel_input(component) == SGTL5000_HP_SEL_LINE_IN && + source == HP_POWER_EVENT) + msleep(SGTL5000_VAG_POWERUP_DELAY); +} + +static int vag_power_consumers(struct snd_soc_component *component, + u16 ana_pwr_reg, u32 source) +{ + int consumers = 0; + + /* count dac/adc consumers unconditional */ + if (ana_pwr_reg & SGTL5000_DAC_POWERUP) + consumers++; + if (ana_pwr_reg & SGTL5000_ADC_POWERUP) + consumers++; + + /* + * If the event comes from HP and Line-In is selected, + * current action is 'DAC to be powered down'. + * As HP_POWERUP is not set when HP muxed to line-in, + * we need to keep VAG power ON. + */ + if (source == HP_POWER_EVENT) { + if (hp_sel_input(component) == SGTL5000_HP_SEL_LINE_IN) + consumers++; + } else { + if (ana_pwr_reg & SGTL5000_HP_POWERUP) + consumers++; + } + + return consumers; +} + +static void vag_power_off(struct snd_soc_component *component, u32 source) +{ + u16 ana_pwr = snd_soc_component_read32(component, + SGTL5000_CHIP_ANA_POWER); + + if (!(ana_pwr & SGTL5000_VAG_POWERUP)) + return; + + /* + * This function calls when any of VAG power consumers is disappearing. + * Thus, if there is more than one consumer at the moment, as minimum + * one consumer will definitely stay after the end of the current + * event. + * Don't clear VAG_POWERUP if 2 or more consumers of VAG present: + * - LINE_IN (for HP events) / HP (for DAC/ADC events) + * - DAC + * - ADC + * (the current consumer is disappearing right now) + */ + if (vag_power_consumers(component, ana_pwr, source) >= 2) + return; + + snd_soc_component_update_bits(component, SGTL5000_CHIP_ANA_POWER, + SGTL5000_VAG_POWERUP, 0); + /* In power down case, we need wait 400-1000 ms + * when VAG fully ramped down. + * As longer we wait, as smaller pop we've got. + */ + msleep(SGTL5000_VAG_POWERDOWN_DELAY); +} + /* * mic_bias power on/off share the same register bits with * output impedance of mic bias, when power on mic bias, we @@ -170,36 +285,46 @@ static int mic_bias_event(struct snd_soc_dapm_widget *w, return 0; } -/* - * As manual described, ADC/DAC only works when VAG powerup, - * So enabled VAG before ADC/DAC up. - * In power down case, we need wait 400ms when vag fully ramped down. - */ -static int power_vag_event(struct snd_soc_dapm_widget *w, - struct snd_kcontrol *kcontrol, int event) +static int vag_and_mute_control(struct snd_soc_component *component, + int event, int event_source) { - struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm); - const u32 mask = SGTL5000_DAC_POWERUP | SGTL5000_ADC_POWERUP; + static const u16 mute_mask[] = { + /* + * Mask for HP_POWER_EVENT. + * Muxing Headphones have to be wrapped with mute/unmute + * headphones only. + */ + SGTL5000_HP_MUTE, + /* + * Masks for DAC_POWER_EVENT/ADC_POWER_EVENT. + * Muxing DAC or ADC block have to wrapped with mute/unmute + * both headphones and line-out. + */ + SGTL5000_OUTPUTS_MUTE, + SGTL5000_OUTPUTS_MUTE + }; + + struct sgtl5000_priv *sgtl5000 = + snd_soc_component_get_drvdata(component); switch (event) { + case SND_SOC_DAPM_PRE_PMU: + sgtl5000->mute_state[event_source] = + mute_output(component, mute_mask[event_source]); + break; case SND_SOC_DAPM_POST_PMU: - snd_soc_component_update_bits(component, SGTL5000_CHIP_ANA_POWER, - SGTL5000_VAG_POWERUP, SGTL5000_VAG_POWERUP); - msleep(400); + vag_power_on(component, event_source); + restore_output(component, mute_mask[event_source], + sgtl5000->mute_state[event_source]); break; - case SND_SOC_DAPM_PRE_PMD: - /* - * Don't clear VAG_POWERUP, when both DAC and ADC are - * operational to prevent inadvertently starving the - * other one of them. - */ - if ((snd_soc_component_read32(component, SGTL5000_CHIP_ANA_POWER) & - mask) != mask) { - snd_soc_component_update_bits(component, SGTL5000_CHIP_ANA_POWER, - SGTL5000_VAG_POWERUP, 0); - msleep(400); - } + sgtl5000->mute_state[event_source] = + mute_output(component, mute_mask[event_source]); + vag_power_off(component, event_source); + break; + case SND_SOC_DAPM_POST_PMD: + restore_output(component, mute_mask[event_source], + sgtl5000->mute_state[event_source]); break; default: break; @@ -208,6 +333,41 @@ static int power_vag_event(struct snd_soc_dapm_widget *w, return 0; } +/* + * Mute Headphone when power it up/down. + * Control VAG power on HP power path. + */ +static int headphone_pga_event(struct snd_soc_dapm_widget *w, + struct snd_kcontrol *kcontrol, int event) +{ + struct snd_soc_component *component = + snd_soc_dapm_to_component(w->dapm); + + return vag_and_mute_control(component, event, HP_POWER_EVENT); +} + +/* As manual describes, ADC/DAC powering up/down requires + * to mute outputs to avoid pops. + * Control VAG power on ADC/DAC power path. + */ +static int adc_updown_depop(struct snd_soc_dapm_widget *w, + struct snd_kcontrol *kcontrol, int event) +{ + struct snd_soc_component *component = + snd_soc_dapm_to_component(w->dapm); + + return vag_and_mute_control(component, event, ADC_POWER_EVENT); +} + +static int dac_updown_depop(struct snd_soc_dapm_widget *w, + struct snd_kcontrol *kcontrol, int event) +{ + struct snd_soc_component *component = + snd_soc_dapm_to_component(w->dapm); + + return vag_and_mute_control(component, event, DAC_POWER_EVENT); +} + /* input sources for ADC */ static const char *adc_mux_text[] = { "MIC_IN", "LINE_IN" @@ -280,7 +440,10 @@ static const struct snd_soc_dapm_widget sgtl5000_dapm_widgets[] = { mic_bias_event, SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD), - SND_SOC_DAPM_PGA("HP", SGTL5000_CHIP_ANA_POWER, 4, 0, NULL, 0), + SND_SOC_DAPM_PGA_E("HP", SGTL5000_CHIP_ANA_POWER, 4, 0, NULL, 0, + headphone_pga_event, + SND_SOC_DAPM_PRE_POST_PMU | + SND_SOC_DAPM_PRE_POST_PMD), SND_SOC_DAPM_PGA("LO", SGTL5000_CHIP_ANA_POWER, 0, 0, NULL, 0), SND_SOC_DAPM_MUX("Capture Mux", SND_SOC_NOPM, 0, 0, &adc_mux), @@ -301,11 +464,12 @@ static const struct snd_soc_dapm_widget sgtl5000_dapm_widgets[] = { 0, SGTL5000_CHIP_DIG_POWER, 1, 0), - SND_SOC_DAPM_ADC("ADC", "Capture", SGTL5000_CHIP_ANA_POWER, 1, 0), - SND_SOC_DAPM_DAC("DAC", "Playback", SGTL5000_CHIP_ANA_POWER, 3, 0), - - SND_SOC_DAPM_PRE("VAG_POWER_PRE", power_vag_event), - SND_SOC_DAPM_POST("VAG_POWER_POST", power_vag_event), + SND_SOC_DAPM_ADC_E("ADC", "Capture", SGTL5000_CHIP_ANA_POWER, 1, 0, + adc_updown_depop, SND_SOC_DAPM_PRE_POST_PMU | + SND_SOC_DAPM_PRE_POST_PMD), + SND_SOC_DAPM_DAC_E("DAC", "Playback", SGTL5000_CHIP_ANA_POWER, 3, 0, + dac_updown_depop, SND_SOC_DAPM_PRE_POST_PMU | + SND_SOC_DAPM_PRE_POST_PMD), }; /* routes for sgtl5000 */

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