Debugger needs access to the client's vm to read and write. For
example inspecting ISA/ELF and setting up breakpoints.
Add ioctl to open target vm with debugger client and vm_handle
and hook up pread/pwrite possibility.
Open will take timeout argument so that standard fsync
can be used for explicit flushing between cpu/gpu for
the target vm.
Implement this for bo backed storage. userptr will
be done in following patch.
v2: - checkpatch (Maciej)
- 32bit fixes (Andrzej)
- bo_vmap (Mika)
- fix vm leak if can't allocate k_buffer (Mika)
- assert vm write held for vma (Matthew)
v3: - fw ref, ttm_bo_access
- timeout boundary check (Dominik)
- dont try to copy to user on zero bytes (Mika)
Cc: Matthew Brost <matthew.br...@intel.com>
Signed-off-by: Mika Kuoppala <mika.kuopp...@linux.intel.com>
---
drivers/gpu/drm/xe/regs/xe_gt_regs.h | 24 ++
drivers/gpu/drm/xe/xe_eudebug.c | 442 +++++++++++++++++++++++++++
include/uapi/drm/xe_drm_eudebug.h | 19 ++
3 files changed, 485 insertions(+)
diff --git a/drivers/gpu/drm/xe/regs/xe_gt_regs.h
b/drivers/gpu/drm/xe/regs/xe_gt_regs.h
index 5fcf06835ef0..4c620f95b466 100644
--- a/drivers/gpu/drm/xe/regs/xe_gt_regs.h
+++ b/drivers/gpu/drm/xe/regs/xe_gt_regs.h
@@ -551,6 +551,30 @@
#define CCS_MODE_CSLICE(cslice, ccs) \
((ccs) << ((cslice) * CCS_MODE_CSLICE_WIDTH))
+#define RCU_ASYNC_FLUSH XE_REG(0x149fc)
+#define RCU_ASYNC_FLUSH_IN_PROGRESS REG_BIT(31)
+#define RCU_ASYNC_FLUSH_ENGINE_ID_SHIFT 28
+#define RCU_ASYNC_FLUSH_ENGINE_ID_DECODE1 REG_BIT(26)
+#define RCU_ASYNC_FLUSH_AMFS REG_BIT(8)
+#define RCU_ASYNC_FLUSH_PREFETCH REG_BIT(7)
+#define RCU_ASYNC_FLUSH_DATA_PORT REG_BIT(6)
+#define RCU_ASYNC_FLUSH_DATA_CACHE REG_BIT(5)
+#define RCU_ASYNC_FLUSH_HDC_PIPELINE REG_BIT(4)
+#define RCU_ASYNC_INVALIDATE_HDC_PIPELINE REG_BIT(3)
+#define RCU_ASYNC_INVALIDATE_CONSTANT_CACHE REG_BIT(2)
+#define RCU_ASYNC_INVALIDATE_TEXTURE_CACHE REG_BIT(1)
+#define RCU_ASYNC_INVALIDATE_INSTRUCTION_CACHE REG_BIT(0)
+#define RCU_ASYNC_FLUSH_AND_INVALIDATE_ALL ( \
+ RCU_ASYNC_FLUSH_AMFS | \
+ RCU_ASYNC_FLUSH_PREFETCH | \
+ RCU_ASYNC_FLUSH_DATA_PORT | \
+ RCU_ASYNC_FLUSH_DATA_CACHE | \
+ RCU_ASYNC_FLUSH_HDC_PIPELINE | \
+ RCU_ASYNC_INVALIDATE_HDC_PIPELINE | \
+ RCU_ASYNC_INVALIDATE_CONSTANT_CACHE | \
+ RCU_ASYNC_INVALIDATE_TEXTURE_CACHE | \
+ RCU_ASYNC_INVALIDATE_INSTRUCTION_CACHE)
+
#define RCU_DEBUG_1 XE_REG(0x14a00)
#define RCU_DEBUG_1_ENGINE_STATUS REG_GENMASK(2, 0)
#define RCU_DEBUG_1_RUNALONE_ACTIVE REG_BIT(2)
diff --git a/drivers/gpu/drm/xe/xe_eudebug.c b/drivers/gpu/drm/xe/xe_eudebug.c
index 3cf3616e546d..9d87df75348b 100644
--- a/drivers/gpu/drm/xe/xe_eudebug.c
+++ b/drivers/gpu/drm/xe/xe_eudebug.c
@@ -5,9 +5,12 @@
#include <linux/anon_inodes.h>
#include <linux/delay.h>
+#include <linux/file.h>
#include <linux/poll.h>
#include <linux/uaccess.h>
+#include <linux/vmalloc.h>
+#include <drm/drm_drv.h>
#include <drm/drm_managed.h>
#include <generated/xe_wa_oob.h>
@@ -16,6 +19,7 @@
#include "regs/xe_engine_regs.h"
#include "xe_assert.h"
+#include "xe_bo.h"
#include "xe_device.h"
#include "xe_eudebug.h"
#include "xe_eudebug_types.h"
@@ -1222,6 +1226,8 @@ static long xe_eudebug_eu_control(struct xe_eudebug *d,
const u64 arg)
return ret;
}
+static long xe_eudebug_vm_open_ioctl(struct xe_eudebug *d, unsigned long arg);
+
static long xe_eudebug_ioctl(struct file *file,
unsigned int cmd,
unsigned long arg)
@@ -1246,6 +1252,11 @@ static long xe_eudebug_ioctl(struct file *file,
ret = xe_eudebug_ack_event_ioctl(d, cmd, arg);
eu_dbg(d, "ioctl cmd=EVENT_ACK ret=%ld\n", ret);
break;
+ case DRM_XE_EUDEBUG_IOCTL_VM_OPEN:
+ ret = xe_eudebug_vm_open_ioctl(d, arg);
+ eu_dbg(d, "ioctl cmd=VM_OPEN ret=%ld\n", ret);
+ break;
+
default:
ret = -EINVAL;
}
@@ -3038,3 +3049,434 @@ void xe_eudebug_ufence_fini(struct xe_user_fence
*ufence)
xe_eudebug_put(ufence->eudebug.debugger);
ufence->eudebug.debugger = NULL;
}
+
+static int xe_eudebug_vma_access(struct xe_vma *vma, u64 offset_in_vma,
+ void *buf, u64 len, bool write)
+{
+ struct xe_bo *bo;
+ u64 bytes;
+
+ lockdep_assert_held_write(&xe_vma_vm(vma)->lock);
+
+ if (XE_WARN_ON(offset_in_vma >= xe_vma_size(vma)))
+ return -EINVAL;
+
+ bytes = min_t(u64, len, xe_vma_size(vma) - offset_in_vma);
+ if (!bytes)
+ return 0;
+
+ bo = xe_bo_get(xe_vma_bo(vma));
+ if (bo) {
+ int ret;
+
+ ret = ttm_bo_access(&bo->ttm, offset_in_vma, buf, bytes, write);
+
+ xe_bo_put(bo);
+
+ return ret;
+ }
+
+ return -EINVAL;
+}
+
+static int xe_eudebug_vm_access(struct xe_vm *vm, u64 offset,
+ void *buf, u64 len, bool write)
+{
+ struct xe_vma *vma;
+ int ret;
+
+ down_write(&vm->lock);
+
+ vma = xe_vm_find_overlapping_vma(vm, offset, len);
+ if (vma) {
+ /* XXX: why find overlapping returns below start? */
+ if (offset < xe_vma_start(vma) ||
+ offset >= (xe_vma_start(vma) + xe_vma_size(vma))) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /* Offset into vma */
+ offset -= xe_vma_start(vma);
+ ret = xe_eudebug_vma_access(vma, offset, buf, len, write);
+ } else {
+ ret = -EINVAL;
+ }
+
+out:
+ up_write(&vm->lock);
+
+ return ret;
+}
+
+struct vm_file {
+ struct xe_eudebug *debugger;
+ struct xe_file *xef;
+ struct xe_vm *vm;
+ u64 flags;
+ u64 client_id;
+ u64 vm_handle;
+ unsigned int timeout_us;
+};
+
+static ssize_t __vm_read_write(struct xe_vm *vm,
+ void *bb,
+ char __user *r_buffer,
+ const char __user *w_buffer,
+ unsigned long offset,
+ unsigned long len,
+ const bool write)
+{
+ ssize_t ret;
+
+ if (!len)
+ return 0;
+
+ if (write) {
+ ret = copy_from_user(bb, w_buffer, len);
+ if (ret)
+ return -EFAULT;
+
+ ret = xe_eudebug_vm_access(vm, offset, bb, len, true);
+ if (ret <= 0)
+ return ret;
+
+ len = ret;
+ } else {
+ ret = xe_eudebug_vm_access(vm, offset, bb, len, false);
+ if (ret <= 0)
+ return ret;
+
+ len = ret;
+
+ ret = copy_to_user(r_buffer, bb, len);
+ if (ret)
+ return -EFAULT;
+ }
+
+ return len;
+}
+
+static struct xe_vm *find_vm_get(struct xe_eudebug *d, const u32 id)
+{
+ struct xe_vm *vm;
+
+ mutex_lock(&d->res->lock);
+ vm = find_resource__unlocked(d->res, XE_EUDEBUG_RES_TYPE_VM, id);
+ if (vm)
+ xe_vm_get(vm);
+
+ mutex_unlock(&d->res->lock);
+
+ return vm;
+}
+
+static ssize_t __xe_eudebug_vm_access(struct file *file,
+ char __user *r_buffer,
+ const char __user *w_buffer,
+ size_t count, loff_t *__pos)
+{
+ struct vm_file *vmf = file->private_data;
+ struct xe_eudebug * const d = vmf->debugger;
+ struct xe_device * const xe = d->xe;
+ const bool write = !!w_buffer;
+ struct xe_vm *vm;
+ ssize_t copied = 0;
+ ssize_t bytes_left = count;
+ ssize_t ret;
+ unsigned long alloc_len;
+ loff_t pos = *__pos;
+ void *k_buffer;
+
+ if (XE_IOCTL_DBG(xe, write && r_buffer))
+ return -EINVAL;
+
+ vm = find_vm_get(d, vmf->vm_handle);
+ if (XE_IOCTL_DBG(xe, !vm))
+ return -EINVAL;
+
+ if (XE_IOCTL_DBG(xe, vm != vmf->vm)) {
+ eu_warn(d, "vm_access(%s): vm handle mismatch
client_handle=%llu, vm_handle=%llu, flags=0x%llx, pos=%llu, count=%zu\n",
+ write ? "write" : "read",
+ vmf->client_id, vmf->vm_handle, vmf->flags, pos, count);
+ xe_vm_put(vm);
+ return -EINVAL;
+ }
+
+ if (!count) {
+ xe_vm_put(vm);
+ return 0;
+ }
+
+ alloc_len = min_t(unsigned long, ALIGN(count, PAGE_SIZE), 64 * SZ_1M);
+ do {
+ k_buffer = vmalloc(alloc_len);
+ if (k_buffer)
+ break;
+
+ alloc_len >>= 1;
+ } while (alloc_len > PAGE_SIZE);
+
+ if (XE_IOCTL_DBG(xe, !k_buffer)) {
+ xe_vm_put(vm);
+ return -ENOMEM;
+ }
+
+ do {
+ const ssize_t len = min_t(ssize_t, bytes_left, alloc_len);
+
+ ret = __vm_read_write(vm, k_buffer,
+ write ? NULL : r_buffer + copied,
+ write ? w_buffer + copied : NULL,
+ pos + copied,
+ len,
+ write);
+ if (ret <= 0)
+ break;
+
+ bytes_left -= ret;
+ copied += ret;
+ } while (bytes_left > 0);
+
+ vfree(k_buffer);
+ xe_vm_put(vm);
+
+ if (XE_WARN_ON(copied < 0))
+ copied = 0;
+
+ *__pos += copied;
+
+ return copied ?: ret;
+}
+
+static ssize_t xe_eudebug_vm_read(struct file *file,
+ char __user *buffer,
+ size_t count, loff_t *pos)
+{
+ return __xe_eudebug_vm_access(file, buffer, NULL, count, pos);
+}
+
+static ssize_t xe_eudebug_vm_write(struct file *file,
+ const char __user *buffer,
+ size_t count, loff_t *pos)
+{
+ return __xe_eudebug_vm_access(file, NULL, buffer, count, pos);
+}
+
+static int engine_rcu_flush(struct xe_eudebug *d,
+ struct xe_hw_engine *hwe,
+ unsigned int timeout_us)
+{
+ const struct xe_reg psmi_addr = RING_PSMI_CTL(hwe->mmio_base);
+ struct xe_gt *gt = hwe->gt;
+ unsigned int fw_ref;
+ u32 mask = RCU_ASYNC_FLUSH_AND_INVALIDATE_ALL;
+ u32 psmi_ctrl;
+ u32 id;
+ int ret;
+
+ if (hwe->class == XE_ENGINE_CLASS_RENDER)
+ id = 0;
+ else if (hwe->class == XE_ENGINE_CLASS_COMPUTE)
+ id = hwe->instance + 1;
+ else
+ return -EINVAL;
+
+ if (id < 8)
+ mask |= id << RCU_ASYNC_FLUSH_ENGINE_ID_SHIFT;
+ else
+ mask |= (id - 8) << RCU_ASYNC_FLUSH_ENGINE_ID_SHIFT |
+ RCU_ASYNC_FLUSH_ENGINE_ID_DECODE1;
+
+ fw_ref = xe_force_wake_get(gt_to_fw(gt), hwe->domain);
+ if (!fw_ref)
+ return -ETIMEDOUT;
+
+ /* Prevent concurrent flushes */
+ mutex_lock(&d->eu_lock);
+ psmi_ctrl = xe_mmio_read32(>->mmio, psmi_addr);
+ if (!(psmi_ctrl & IDLE_MSG_DISABLE))
+ xe_mmio_write32(>->mmio, psmi_addr,
_MASKED_BIT_ENABLE(IDLE_MSG_DISABLE));
+
+ /* XXX: Timeout is per operation but in here we flush previous */
+ ret = xe_mmio_wait32(>->mmio, RCU_ASYNC_FLUSH,
+ RCU_ASYNC_FLUSH_IN_PROGRESS, 0,
+ timeout_us, NULL, false);
+ if (ret)
+ goto out;
+
+ xe_mmio_write32(>->mmio, RCU_ASYNC_FLUSH, mask);
+
+ ret = xe_mmio_wait32(>->mmio, RCU_ASYNC_FLUSH,
+ RCU_ASYNC_FLUSH_IN_PROGRESS, 0,
+ timeout_us, NULL, false);
+out:
+ if (!(psmi_ctrl & IDLE_MSG_DISABLE))
+ xe_mmio_write32(>->mmio, psmi_addr,
_MASKED_BIT_DISABLE(IDLE_MSG_DISABLE));
+
+ mutex_unlock(&d->eu_lock);
+ xe_force_wake_put(gt_to_fw(gt), fw_ref);
+
+ return ret;
+}
+
+static int xe_eudebug_vm_fsync(struct file *file, loff_t start, loff_t end,
int datasync)
+{
+ struct vm_file *vmf = file->private_data;
+ struct xe_eudebug *d = vmf->debugger;
+ struct xe_gt *gt;
+ int gt_id;
+ int ret = -EINVAL;
+
+ eu_dbg(d, "vm_fsync: client_handle=%llu, vm_handle=%llu, flags=0x%llx,
start=%llu, end=%llu datasync=%d\n",
+ vmf->client_id, vmf->vm_handle, vmf->flags, start, end,
datasync);
+
+ for_each_gt(gt, d->xe, gt_id) {
+ struct xe_hw_engine *hwe;
+ enum xe_hw_engine_id id;
+
+ /* XXX: vm open per engine? */
+ for_each_hw_engine(hwe, gt, id) {
+ if (hwe->class != XE_ENGINE_CLASS_RENDER &&
+ hwe->class != XE_ENGINE_CLASS_COMPUTE)
+ continue;
+
+ ret = engine_rcu_flush(d, hwe, vmf->timeout_us);
+ if (ret)
+ break;
+ }
+ }
+
+ return ret;
+}
+
+static int xe_eudebug_vm_release(struct inode *inode, struct file *file)
+{
+ struct vm_file *vmf = file->private_data;
+ struct xe_eudebug *d = vmf->debugger;
+
+ eu_dbg(d, "vm_release: client_handle=%llu, vm_handle=%llu,
flags=0x%llx",
+ vmf->client_id, vmf->vm_handle, vmf->flags);
+
+ xe_vm_put(vmf->vm);
+ xe_file_put(vmf->xef);
+ xe_eudebug_put(d);
+ drm_dev_put(&d->xe->drm);
+
+ kfree(vmf);
+
+ return 0;
+}
+
+static const struct file_operations vm_fops = {
+ .owner = THIS_MODULE,
+ .llseek = generic_file_llseek,
+ .read = xe_eudebug_vm_read,
+ .write = xe_eudebug_vm_write,
+ .fsync = xe_eudebug_vm_fsync,
+ .mmap = NULL,
+ .release = xe_eudebug_vm_release,
+};
+
+static long
+xe_eudebug_vm_open_ioctl(struct xe_eudebug *d, unsigned long arg)
+{
+ const u64 max_timeout_ns = DRM_XE_EUDEBUG_VM_SYNC_MAX_TIMEOUT_NSECS;
+ struct drm_xe_eudebug_vm_open param;
+ struct xe_device * const xe = d->xe;
+ struct vm_file *vmf = NULL;
+ struct xe_file *xef;
+ struct xe_vm *vm;
+ struct file *file;
+ long ret = 0;
+ int fd;
+
+ if (XE_IOCTL_DBG(xe, _IOC_SIZE(DRM_XE_EUDEBUG_IOCTL_VM_OPEN) !=
sizeof(param)))
+ return -EINVAL;
+
+ if (XE_IOCTL_DBG(xe, !(_IOC_DIR(DRM_XE_EUDEBUG_IOCTL_VM_OPEN) &
_IOC_WRITE)))
+ return -EINVAL;
+
+ if (XE_IOCTL_DBG(xe, copy_from_user(¶m, (void __user *)arg,
sizeof(param))))
+ return -EFAULT;
+
+ if (XE_IOCTL_DBG(xe, param.flags))
+ return -EINVAL;
+
+ if (XE_IOCTL_DBG(xe, param.timeout_ns > max_timeout_ns))
+ return -EINVAL;
+
+ if (XE_IOCTL_DBG(xe, xe_eudebug_detached(d)))
+ return -ENOTCONN;
+
+ xef = find_client_get(d, param.client_handle);
+ if (xef)
+ vm = find_vm_get(d, param.vm_handle);
+ else
+ vm = NULL;
+
+ if (XE_IOCTL_DBG(xe, !xef))
+ return -EINVAL;
+
+ if (XE_IOCTL_DBG(xe, !vm)) {
+ ret = -EINVAL;
+ goto out_file_put;
+ }
+
+ vmf = kzalloc(sizeof(*vmf), GFP_KERNEL);
+ if (XE_IOCTL_DBG(xe, !vmf)) {
+ ret = -ENOMEM;
+ goto out_vm_put;
+ }
+
+ fd = get_unused_fd_flags(O_CLOEXEC);
+ if (XE_IOCTL_DBG(xe, fd < 0)) {
+ ret = fd;
+ goto out_free;
+ }
+
+ kref_get(&d->ref);
+ vmf->debugger = d;
+ vmf->vm = vm;
+ vmf->xef = xef;
+ vmf->flags = param.flags;
+ vmf->client_id = param.client_handle;
+ vmf->vm_handle = param.vm_handle;
+ vmf->timeout_us = div64_u64(param.timeout_ns, 1000ull);
+
+ file = anon_inode_getfile("[xe_eudebug.vm]", &vm_fops, vmf, O_RDWR);
+ if (IS_ERR(file)) {
+ ret = PTR_ERR(file);
+ XE_IOCTL_DBG(xe, ret);
+ file = NULL;
+ goto out_fd_put;
+ }
+
+ file->f_mode |= FMODE_PREAD | FMODE_PWRITE |
+ FMODE_READ | FMODE_WRITE | FMODE_LSEEK;
+
+ fd_install(fd, file);
+
+ eu_dbg(d, "vm_open: client_handle=%llu, handle=%llu, flags=0x%llx,
fd=%d",
+ vmf->client_id, vmf->vm_handle, vmf->flags, fd);
+
+ XE_WARN_ON(ret);
+
+ drm_dev_get(&xe->drm);
+
+ return fd;
+
+out_fd_put:
+ put_unused_fd(fd);
+ xe_eudebug_put(d);
+out_free:
+ kfree(vmf);
+out_vm_put:
+ xe_vm_put(vm);
+out_file_put:
+ xe_file_put(xef);
+
+ XE_WARN_ON(ret >= 0);
+
+ return ret;
+}
diff --git a/include/uapi/drm/xe_drm_eudebug.h
b/include/uapi/drm/xe_drm_eudebug.h
index 1d5f1411c9a8..a5f13563b3b9 100644
--- a/include/uapi/drm/xe_drm_eudebug.h
+++ b/include/uapi/drm/xe_drm_eudebug.h
@@ -18,6 +18,7 @@ extern "C" {
#define DRM_XE_EUDEBUG_IOCTL_READ_EVENT _IO('j', 0x0)
#define DRM_XE_EUDEBUG_IOCTL_EU_CONTROL _IOWR('j', 0x2, struct
drm_xe_eudebug_eu_control)
#define DRM_XE_EUDEBUG_IOCTL_ACK_EVENT _IOW('j', 0x4, struct
drm_xe_eudebug_ack_event)
+#define DRM_XE_EUDEBUG_IOCTL_VM_OPEN _IOW('j', 0x1, struct
drm_xe_eudebug_vm_open)
/* XXX: Document events to match their internal counterparts when moved to
xe_drm.h */
struct drm_xe_eudebug_event {
@@ -187,6 +188,24 @@ struct drm_xe_eudebug_ack_event {
__u64 seqno;
};
+struct drm_xe_eudebug_vm_open {
+ /** @extensions: Pointer to the first extension struct, if any */
+ __u64 extensions;
+
+ /** @client_handle: id of client */
+ __u64 client_handle;
+
+ /** @vm_handle: id of vm */
+ __u64 vm_handle;
+
+ /** @flags: flags */
+ __u64 flags;
+
+#define DRM_XE_EUDEBUG_VM_SYNC_MAX_TIMEOUT_NSECS (10ULL * NSEC_PER_SEC)
+ /** @timeout_ns: Timeout value in nanoseconds operations (fsync) */
+ __u64 timeout_ns;
+};
+
#if defined(__cplusplus)
}
#endif
--
2.43.0
