diff options
Diffstat (limited to 'SOURCES/0001-drivers-perf-xgene_pmu-Fix-uninitialized-resource-st.patch')
| -rw-r--r-- | SOURCES/0001-drivers-perf-xgene_pmu-Fix-uninitialized-resource-st.patch | 128 |
1 files changed, 70 insertions, 58 deletions
diff --git a/SOURCES/0001-drivers-perf-xgene_pmu-Fix-uninitialized-resource-st.patch b/SOURCES/0001-drivers-perf-xgene_pmu-Fix-uninitialized-resource-st.patch index ddd1bb2..00975ae 100644 --- a/SOURCES/0001-drivers-perf-xgene_pmu-Fix-uninitialized-resource-st.patch +++ b/SOURCES/0001-drivers-perf-xgene_pmu-Fix-uninitialized-resource-st.patch @@ -1,45 +1,15 @@ -From 68912566d659046b12b02e5a316af3760e08eab8 Mon Sep 17 00:00:00 2001 -From: Fedora Kernel Team <kernel-team@fedoraproject.org> -Date: Tue, 1 Sep 2020 18:44:00 -0400 +From b0697932d03bd78bd4db6466939680c0fbdd8589 Mon Sep 17 00:00:00 2001 +From: Mark Salter <msalter@redhat.com> +Date: Tue, 15 Sep 2020 16:41:09 -0400 Subject: [PATCH] drivers/perf: xgene_pmu: Fix uninitialized resource struct This splat was reported on newer Fedora kernels booting on certain -Ampere machines: +X-gene based machines: xgene-pmu APMC0D83:00: X-Gene PMU version 3 - Unable to handle kernel read from unreadable memory at virtual address 0000000000004006 - Mem abort info: - ESR = 0x96000004 - EC = 0x25: DABT (current EL), IL = 32 bits - SET = 0, FnV = 0 - EA = 0, S1PTW = 0 - Data abort info: - ISV = 0, ISS = 0x00000004 - CM = 0, WnR = 0 - [0000000000004006] user address but active_mm is swapper - Internal error: Oops: 96000004 [#1] SMP - Modules linked in: - CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.8.3-300.fc33.aarch64 #1 - Hardware name: Lenovo HR350A 7X35CTO1WW /HR350A , BIOS HVE104N-1.12 11/29/2019 - pstate: 00400005 (nzcv daif +PAN -UAO BTYPE=--) - pc : string+0x50/0x100 - lr : vsnprintf+0x160/0x750 - sp : ffff800012b4b760 - x29: ffff800012b4b760 x28: 000000000000000c - x27: ffff8000113610d5 x26: ffff8000113610d5 - x25: 0000000000000020 x24: 0000000000000000 - x23: 00000000ffffffe8 x22: ffff800010f8e628 - x21: ffff800012b4b8f0 x20: 0000000000000000 - x19: 0000000000000000 x18: 00000000fffffffc - x17: 000000000000002d x16: 0000000000000001 - x15: 0000000000000020 x14: 0000000000000000 - x13: 0000000000000000 x12: 071c71c71c71c71c - x11: 00000000ffffff76 x10: ffff800012b4b8f0 - x9 : ffff8000109e97d8 x8 : 00000000ffffffff - x7 : 000000000000000b x6 : 0000000000000000 - x5 : 0000000000000000 x4 : 0000000000000000 - x3 : ffff0a00ffffff04 x2 : 0000000000004006 - x1 : ffffffffffffffff x0 : 000000000000000c + Unable to handle kernel read from unreadable memory at virtual \ + address 0000000000004006 + ... Call trace: string+0x50/0x100 vsnprintf+0x160/0x750 @@ -72,38 +42,80 @@ Ampere machines: ret_from_fork+0x10/0x18 Code: 91000400 110004e1 eb08009f 540000c0 (38646846) ---[ end trace f08c10566496a703 ]--- - Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b - SMP: stopping secondary CPUs - Kernel Offset: 0x40000 from 0xffff800010000000 - PHYS_OFFSET: 0x80000000 - CPU features: 0x240002,20802008 - Memory Limit: none -This was due to a local struct resource variable in acpi_get_pmu_hw_inf(). -A pointer to that struct makes it's way to __devm_ioremap_resource() -where the name field is passed to devm_kasprintf() and dereferenced. -The struct was never initialized, so the name pointer is whatever -happened to be on the stack. This has been the case since the original -checkin of xgene_pmu.c, but it was a recent change to which added the -use of the name field. +This is due to use of an uninitialized local resource struct in the xgene +pmu driver. The thunderx2_pmu driver avoids this by using the resource list +constructed by acpi_dev_get_resources() rather than using a callback from +that function. The callback in the xgene driver didn't fully initialize +the resource. So get rid of the callback and search the resource list as +done by thunderx2. +Fixes: 832c927d119b ("perf: xgene: Add APM X-Gene SoC Performance Monitoring Unit driver") Signed-off-by: Mark Salter <msalter@redhat.com> +Link: https://lore.kernel.org/r/20200915204110.326138-1-msalter@redhat.com +Signed-off-by: Will Deacon <will@kernel.org> --- - drivers/perf/xgene_pmu.c | 1 + - 1 file changed, 1 insertion(+) + drivers/perf/xgene_pmu.c | 32 +++++++++++++++++--------------- + 1 file changed, 17 insertions(+), 15 deletions(-) diff --git a/drivers/perf/xgene_pmu.c b/drivers/perf/xgene_pmu.c -index edac28c..fdbbd08 100644 +index edac28cd25dd..633cf07ba672 100644 --- a/drivers/perf/xgene_pmu.c +++ b/drivers/perf/xgene_pmu.c -@@ -1483,6 +1483,7 @@ xgene_pmu_dev_ctx *acpi_get_pmu_hw_inf(struct xgene_pmu *xgene_pmu, +@@ -1453,17 +1453,6 @@ static char *xgene_pmu_dev_name(struct device *dev, u32 type, int id) + } + + #if defined(CONFIG_ACPI) +-static int acpi_pmu_dev_add_resource(struct acpi_resource *ares, void *data) +-{ +- struct resource *res = data; +- +- if (ares->type == ACPI_RESOURCE_TYPE_FIXED_MEMORY32) +- acpi_dev_resource_memory(ares, res); +- +- /* Always tell the ACPI core to skip this resource */ +- return 1; +-} +- + static struct + xgene_pmu_dev_ctx *acpi_get_pmu_hw_inf(struct xgene_pmu *xgene_pmu, + struct acpi_device *adev, u32 type) +@@ -1475,6 +1464,7 @@ xgene_pmu_dev_ctx *acpi_get_pmu_hw_inf(struct xgene_pmu *xgene_pmu, + struct hw_pmu_info *inf; + void __iomem *dev_csr; + struct resource res; ++ struct resource_entry *rentry; + int enable_bit; + int rc; + +@@ -1483,11 +1473,23 @@ xgene_pmu_dev_ctx *acpi_get_pmu_hw_inf(struct xgene_pmu *xgene_pmu, return NULL; INIT_LIST_HEAD(&resource_list); -+ memset(&res, 0, sizeof(res)); - rc = acpi_dev_get_resources(adev, &resource_list, - acpi_pmu_dev_add_resource, &res); +- rc = acpi_dev_get_resources(adev, &resource_list, +- acpi_pmu_dev_add_resource, &res); ++ rc = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); ++ if (rc <= 0) { ++ dev_err(dev, "PMU type %d: No resources found\n", type); ++ return NULL; ++ } ++ ++ list_for_each_entry(rentry, &resource_list, node) { ++ if (resource_type(rentry->res) == IORESOURCE_MEM) { ++ res = *rentry->res; ++ rentry = NULL; ++ break; ++ } ++ } acpi_dev_free_resource_list(&resource_list); +- if (rc < 0) { +- dev_err(dev, "PMU type %d: No resource address found\n", type); ++ ++ if (rentry) { ++ dev_err(dev, "PMU type %d: No memory resource found\n", type); + return NULL; + } + -- -2.26.0 +2.26.2 |