drm/amdgpu: Add amdgpu_regs_pcie64 debugfs node

Add amdgpu_regs_pcie64 debugfs node to
read/write 64bit PCIE registers.

Signed-off-by: Stanley.Yang <Stanley.Yang@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
index aa9239b310a3586fe68a4632d19567fc5e613168..092fd330909984f21c5ea834e584f7e6aa2fe25c 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
@@ -617,6 +617,110 @@ out:
        return r;
 }
 
+/**
+ * amdgpu_debugfs_regs_pcie64_read - Read from a 64-bit PCIE register
+ *
+ * @f: open file handle
+ * @buf: User buffer to store read data in
+ * @size: Number of bytes to read
+ * @pos:  Offset to seek to
+ */
+static ssize_t amdgpu_debugfs_regs_pcie64_read(struct file *f, char __user *buf,
+                                       size_t size, loff_t *pos)
+{
+       struct amdgpu_device *adev = file_inode(f)->i_private;
+       ssize_t result = 0;
+       int r;
+
+       if (size & 0x7 || *pos & 0x7)
+               return -EINVAL;
+
+       r = pm_runtime_get_sync(adev_to_drm(adev)->dev);
+       if (r < 0) {
+               pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
+               return r;
+       }
+
+       r = amdgpu_virt_enable_access_debugfs(adev);
+       if (r < 0) {
+               pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
+               return r;
+       }
+
+       while (size) {
+               uint64_t value;
+
+               value = RREG64_PCIE_EXT(*pos);
+
+               r = put_user(value, (uint64_t *)buf);
+               if (r)
+                       goto out;
+
+               result += 8;
+               buf += 8;
+               *pos += 8;
+               size -= 8;
+       }
+
+       r = result;
+out:
+       pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
+       amdgpu_virt_disable_access_debugfs(adev);
+       return r;
+}
+
+/**
+ * amdgpu_debugfs_regs_pcie64_write - Write to a 64-bit PCIE register
+ *
+ * @f: open file handle
+ * @buf: User buffer to write data from
+ * @size: Number of bytes to write
+ * @pos:  Offset to seek to
+ */
+static ssize_t amdgpu_debugfs_regs_pcie64_write(struct file *f, const char __user *buf,
+                                       size_t size, loff_t *pos)
+{
+       struct amdgpu_device *adev = file_inode(f)->i_private;
+       ssize_t result = 0;
+       int r;
+
+       if (size & 0x7 || *pos & 0x7)
+               return -EINVAL;
+
+       r = pm_runtime_get_sync(adev_to_drm(adev)->dev);
+       if (r < 0) {
+               pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
+               return r;
+       }
+
+       r = amdgpu_virt_enable_access_debugfs(adev);
+       if (r < 0) {
+               pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
+               return r;
+       }
+
+       while (size) {
+               uint64_t value;
+
+               r = get_user(value, (uint64_t *)buf);
+               if (r)
+                       goto out;
+
+               WREG64_PCIE_EXT(*pos, value);
+
+               result += 8;
+               buf += 8;
+               *pos += 8;
+               size -= 8;
+       }
+
+       r = result;
+out:
+       pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
+       amdgpu_virt_disable_access_debugfs(adev);
+       return r;
+}
+
 /**
  * amdgpu_debugfs_regs_didt_read - Read from a DIDT register
  *
@@ -1525,6 +1629,12 @@ static const struct file_operations amdgpu_debugfs_regs_pcie_fops = {
        .write = amdgpu_debugfs_regs_pcie_write,
        .llseek = default_llseek
 };
+static const struct file_operations amdgpu_debugfs_regs_pcie64_fops = {
+       .owner = THIS_MODULE,
+       .read = amdgpu_debugfs_regs_pcie64_read,
+       .write = amdgpu_debugfs_regs_pcie64_write,
+       .llseek = default_llseek
+};
 static const struct file_operations amdgpu_debugfs_regs_smc_fops = {
        .owner = THIS_MODULE,
        .read = amdgpu_debugfs_regs_smc_read,
@@ -1587,6 +1697,7 @@ static const struct file_operations *debugfs_regs[] = {
        &amdgpu_debugfs_gprwave_fops,
        &amdgpu_debugfs_regs_didt_fops,
        &amdgpu_debugfs_regs_pcie_fops,
+       &amdgpu_debugfs_regs_pcie64_fops,
        &amdgpu_debugfs_regs_smc_fops,
        &amdgpu_debugfs_gca_config_fops,
        &amdgpu_debugfs_sensors_fops,
@@ -1604,6 +1715,7 @@ static const char * const debugfs_regs_names[] = {
        "amdgpu_gprwave",
        "amdgpu_regs_didt",
        "amdgpu_regs_pcie",
+       "amdgpu_regs_pcie64",
        "amdgpu_regs_smc",
        "amdgpu_gca_config",
        "amdgpu_sensors",