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igt/gem_mmap_gtt: Exercise concurrent pagefaulting
This should hit the BUG inside remap_pfn_range in commit c5158fabeaf53ed2c614c3333aaa4b3cce80f500 Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Tue Jun 10 12:14:41 2014 +0100 [ 27.767634] kernel BUG at mm/memory.c:2315! [ 27.767655] invalid opcode: 0000 [#1] SMP [ 27.767679] Modules linked in: cpufreq_userspace cpufreq_powersave cpufreq_stats cpufreq_conservative binfmt_misc nfs lockd fscache sunrpc hid_generic usbhid hid x86_pkg_temp_thermal microcode i2c_i801 lpc_ich mfd_core battery acpi_cpufreq evdev processor ac loop ehci_pci xhci_hcd ehci_hcd sr_mod usbcore cdrom usb_common fan thermal [ 27.767872] CPU: 3 PID: 912 Comm: gem_mmap_gtt Not tainted 3.15.0-rc8+ #953 [ 27.767903] Hardware name: Intel Corporation Shark Bay Client platform/Flathead Creek Crb, BIOS HSWLPTU1.86C.0109.R03.1301282055 01/28/2013 [ 27.767956] task: ffff880448415010 ti: ffff88044d22c000 task.ti: ffff88044d22c000 [ 27.767988] RIP: 0010:[<ffffffff81130734>] [<ffffffff81130734>] remap_pfn_range+0x2a4/0x400 [ 27.768033] RSP: 0000:ffff88044d22fc28 EFLAGS: 00010282 [ 27.768057] RAX: 0000000000020002 RBX: 00000000000a3b57 RCX: ffff880448b73fe8 [ 27.768088] RDX: 0000000000000002 RSI: ffff880000000000 RDI: ffffea000efe8158 [ 27.768119] RBP: ffff88044d22fcd8 R08: 00007fc7b57fe000 R09: 00007fc7b57fe000 [ 27.768150] R10: 00000000000001fd R11: 0000000000000a9a R12: ffffea000efe8128 [ 27.768180] R13: 0000000000000001 R14: 00007fc7b57fd000 R15: 800000000000002f [ 27.768212] FS: 00007fc7977fc700(0000) GS:ffff88045e380000(0000) knlGS:0000000000000000 [ 27.768246] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.768272] CR2: 00007fc7b67fd000 CR3: 000000044866c000 CR4: 00000000001407e0 [ 27.768303] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.768333] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.768363] Stack: [ 27.768374] ffff880448bbb6f8 00000000ffffffff 00007fc7b57fdfff 00007fc7b57fdfff [ 27.768414] 00007fc7b57fe000 ffff88044866c7f8 ffff8804496b08f0 00007fc7b57fdfff [ 27.768454] fffffff8038ee35a 0000000000001000 ffff88044c208180 00007fc7b57fe000 [ 27.768494] Call Trace: [ 27.768511] [<ffffffff81365277>] i915_gem_fault+0x337/0x340 [ 27.768538] [<ffffffff8112d3c4>] __do_fault+0x34/0x70 [ 27.768565] [<ffffffff8109088e>] ? wake_up_process+0x1e/0x40 [ 27.768592] [<ffffffff8113015c>] do_shared_fault.isra.96+0x2c/0x1f0 [ 27.768623] [<ffffffff81502405>] ? rwsem_down_read_failed+0xe5/0x130 [ 27.768654] [<ffffffff810a2519>] ? __rwsem_do_wake+0x129/0x160 [ 27.768682] [<ffffffff81131085>] handle_mm_fault+0x2b5/0xb80 [ 27.768712] [<ffffffff81270a64>] ? call_rwsem_down_read_failed+0x14/0x30 [ 27.768745] [<ffffffff81036c67>] __do_page_fault+0x167/0x4c0 [ 27.768774] [<ffffffff8109a540>] ? pick_next_task_fair+0x700/0x870 [ 27.768804] [<ffffffff814ff23b>] ? __schedule+0x27b/0x860 [ 27.768831] [<ffffffff81036fec>] do_page_fault+0xc/0x10 [ 27.768857] [<ffffffff815034a2>] page_fault+0x22/0x30 [ 27.768881] Code: 4d 85 ed 49 0f 44 d7 80 cc 02 49 81 c6 00 10 00 00 48 83 c3 01 48 83 c1 08 48 09 d0 48 89 41 f8 4d 39 f0 74 32 48 83 39 00 74 c4 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 48 39 37 75 63 48 8b 45 c8 [ 27.769081] RIP [<ffffffff81130734>] remap_pfn_range+0x2a4/0x400 [ 27.769113] RSP <ffff88044d22fc28> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson
parent
8a23da43d4
commit
d242f2e2a3
@ -53,6 +53,8 @@ gem_fence_thrash_CFLAGS = $(AM_CFLAGS) $(THREAD_CFLAGS)
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gem_fence_thrash_LDADD = $(LDADD) -lpthread
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gem_flink_race_CFLAGS = $(AM_CFLAGS) $(THREAD_CFLAGS)
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gem_flink_race_LDADD = $(LDADD) -lpthread
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gem_mmap_gtt_CFLAGS = $(AM_CFLAGS) $(THREAD_CFLAGS)
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gem_mmap_gtt_LDADD = $(LDADD) -lpthread
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gem_threaded_access_tiled_CFLAGS = $(AM_CFLAGS) $(THREAD_CFLAGS)
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gem_threaded_access_tiled_LDADD = $(LDADD) -lpthread
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gem_tiled_swapping_CFLAGS = $(AM_CFLAGS) $(THREAD_CFLAGS)
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@ -32,6 +32,7 @@
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#include <string.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <pthread.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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@ -126,6 +127,63 @@ test_copy(int fd)
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munmap(src, OBJECT_SIZE);
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}
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enum test_read_write {
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READ_BEFORE_WRITE,
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READ_AFTER_WRITE,
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};
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static void
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test_read_write(int fd, enum test_read_write order)
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{
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uint32_t handle;
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void *ptr;
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volatile uint32_t val = 0;
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handle = gem_create(fd, OBJECT_SIZE);
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ptr = gem_mmap(fd, handle, OBJECT_SIZE, PROT_READ | PROT_WRITE);
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igt_assert(ptr != MAP_FAILED);
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if (order == READ_BEFORE_WRITE) {
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val = *(uint32_t *)ptr;
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*(uint32_t *)ptr = val;
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} else {
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*(uint32_t *)ptr = val;
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val = *(uint32_t *)ptr;
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}
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gem_close(fd, handle);
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munmap(ptr, OBJECT_SIZE);
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}
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static void
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test_read_write2(int fd, enum test_read_write order)
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{
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uint32_t handle;
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void *r, *w;
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volatile uint32_t val = 0;
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handle = gem_create(fd, OBJECT_SIZE);
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r = gem_mmap(fd, handle, OBJECT_SIZE, PROT_READ);
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igt_assert(r != MAP_FAILED);
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w = gem_mmap(fd, handle, OBJECT_SIZE, PROT_READ | PROT_WRITE);
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igt_assert(w != MAP_FAILED);
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if (order == READ_BEFORE_WRITE) {
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val = *(uint32_t *)r;
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*(uint32_t *)w = val;
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} else {
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*(uint32_t *)w = val;
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val = *(uint32_t *)r;
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}
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gem_close(fd, handle);
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munmap(r, OBJECT_SIZE);
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munmap(w, OBJECT_SIZE);
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}
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static void
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test_write(int fd)
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{
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@ -181,6 +239,54 @@ test_read(int fd)
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munmap(dst, OBJECT_SIZE);
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}
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struct thread_fault_concurrent {
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pthread_t thread;
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int id;
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uint32_t **ptr;
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};
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static void *
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thread_fault_concurrent(void *closure)
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{
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struct thread_fault_concurrent *t = closure;
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uint32_t val = 0;
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int n;
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for (n = 0; n < 32; n++) {
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if (n & 1)
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*t->ptr[(n + t->id) % 32] = val;
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else
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val = *t->ptr[(n + t->id) % 32];
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}
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return NULL;
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}
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static void
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test_fault_concurrent(int fd)
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{
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uint32_t *ptr[32];
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struct thread_fault_concurrent thread[64];
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int n;
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for (n = 0; n < 32; n++) {
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ptr[n] = create_pointer(fd);
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}
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for (n = 0; n < 64; n++) {
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thread[n].ptr = ptr;
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thread[n].id = n;
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pthread_create(&thread[n].thread, NULL, thread_fault_concurrent, &thread[n]);
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}
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for (n = 0; n < 64; n++)
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pthread_join(thread[n].thread, NULL);
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for (n = 0; n < 32; n++) {
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munmap(ptr[n], OBJECT_SIZE);
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}
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}
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static void
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run_without_prefault(int fd,
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void (*func)(int fd))
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@ -210,6 +316,16 @@ igt_main
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test_write(fd);
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igt_subtest("write-gtt")
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test_write_gtt(fd);
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igt_subtest("read-write")
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test_read_write(fd, READ_BEFORE_WRITE);
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igt_subtest("write-read")
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test_read_write(fd, READ_AFTER_WRITE);
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igt_subtest("read-write-distinct")
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test_read_write2(fd, READ_BEFORE_WRITE);
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igt_subtest("write-read-distinct")
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test_read_write2(fd, READ_AFTER_WRITE);
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igt_subtest("fault-concurrent")
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test_fault_concurrent(fd);
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igt_subtest("read-no-prefault")
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run_without_prefault(fd, test_read);
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igt_subtest("write-no-prefault")
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