drm/amdgpu: Fix ENOSYS means 'invalid syscall nr' in amdgpu_device.c

ENOSYS should be used for nonexistent syscalls only, replace ENOSYS with
EOPNOTSUPP for reset handlers that are not implemented for respective ASIC.

WARNING: ENOSYS means 'invalid syscall nr' and nothing else
+       if (r == -ENOSYS)

WARNING: ENOSYS means 'invalid syscall nr' and nothing else
+       if (r == -ENOSYS)

And other following style fixes in amdgpu_device.c:

WARNING: Symbolic permissions 'S_IRUGO' are not preferred. Consider using octal permissions '0444'.
WARNING: Block comments should align the * on each line
WARNING: Missing a blank line after declarations
WARNING: braces {} are not necessary for single statement blocks

Cc: Lijo Lazar <lijo.lazar@amd.com>
Cc: Kent Russell <kent.russell@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reviewed-by: Guchun Chen <guchun.chen@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c

@@ -159,7 +159,7 @@ static ssize_t amdgpu_device_get_pcie_replay_count(struct device *dev,
 	return sysfs_emit(buf, "%llu\n", cnt);
 }
 
-static DEVICE_ATTR(pcie_replay_count, S_IRUGO,
+static DEVICE_ATTR(pcie_replay_count, 0444,
 		amdgpu_device_get_pcie_replay_count, NULL);
 
 static void amdgpu_device_get_pcie_info(struct amdgpu_device *adev);
@@ -183,7 +183,7 @@ static ssize_t amdgpu_device_get_product_name(struct device *dev,
 	return sysfs_emit(buf, "%s\n", adev->product_name);
 }
 
-static DEVICE_ATTR(product_name, S_IRUGO,
+static DEVICE_ATTR(product_name, 0444,
 		amdgpu_device_get_product_name, NULL);
 
 /**
@@ -205,7 +205,7 @@ static ssize_t amdgpu_device_get_product_number(struct device *dev,
 	return sysfs_emit(buf, "%s\n", adev->product_number);
 }
 
-static DEVICE_ATTR(product_number, S_IRUGO,
+static DEVICE_ATTR(product_number, 0444,
 		amdgpu_device_get_product_number, NULL);
 
 /**
@@ -227,7 +227,7 @@ static ssize_t amdgpu_device_get_serial_number(struct device *dev,
 	return sysfs_emit(buf, "%s\n", adev->serial);
 }
 
-static DEVICE_ATTR(serial_number, S_IRUGO,
+static DEVICE_ATTR(serial_number, 0444,
 		amdgpu_device_get_serial_number, NULL);
 
 /**
@@ -481,8 +481,7 @@ uint32_t amdgpu_device_rreg(struct amdgpu_device *adev,
 /*
  * MMIO register read with bytes helper functions
  * @offset:bytes offset from MMIO start
- *
-*/
+ */
 
 /**
  * amdgpu_mm_rreg8 - read a memory mapped IO register
@@ -506,8 +505,8 @@ uint8_t amdgpu_mm_rreg8(struct amdgpu_device *adev, uint32_t offset)
  * MMIO register write with bytes helper functions
  * @offset:bytes offset from MMIO start
  * @value: the value want to be written to the register
- *
-*/
+ */
+
 /**
  * amdgpu_mm_wreg8 - read a memory mapped IO register
  *
@@ -991,7 +990,7 @@ static void amdgpu_device_mem_scratch_fini(struct amdgpu_device *adev)
  * @registers: pointer to the register array
  * @array_size: size of the register array
  *
- * Programs an array or registers with and and or masks.
+ * Programs an array or registers with and or masks.
  * This is a helper for setting golden registers.
  */
 void amdgpu_device_program_register_sequence(struct amdgpu_device *adev,
@@ -1157,7 +1156,7 @@ int amdgpu_device_resize_fb_bar(struct amdgpu_device *adev)
 	int rbar_size = pci_rebar_bytes_to_size(adev->gmc.real_vram_size);
 	struct pci_bus *root;
 	struct resource *res;
-	unsigned i;
+	unsigned int i;
 	u16 cmd;
 	int r;
 
@@ -1226,9 +1225,8 @@ int amdgpu_device_resize_fb_bar(struct amdgpu_device *adev)
 
 static bool amdgpu_device_read_bios(struct amdgpu_device *adev)
 {
-	if (hweight32(adev->aid_mask) && (adev->flags & AMD_IS_APU)) {
+	if (hweight32(adev->aid_mask) && (adev->flags & AMD_IS_APU))
 		return false;
-	}
 
 	return true;
 }
@@ -1264,6 +1262,7 @@ bool amdgpu_device_need_post(struct amdgpu_device *adev)
 		if (adev->asic_type == CHIP_FIJI) {
 			int err;
 			uint32_t fw_ver;
+
 			err = request_firmware(&adev->pm.fw, "amdgpu/fiji_smc.bin", adev->dev);
 			/* force vPost if error occured */
 			if (err)
@@ -1366,6 +1365,7 @@ static unsigned int amdgpu_device_vga_set_decode(struct pci_dev *pdev,
 		bool state)
 {
 	struct amdgpu_device *adev = drm_to_adev(pci_get_drvdata(pdev));
+
 	amdgpu_asic_set_vga_state(adev, state);
 	if (state)
 		return VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM |
@@ -1388,7 +1388,8 @@ static void amdgpu_device_check_block_size(struct amdgpu_device *adev)
 {
 	/* defines number of bits in page table versus page directory,
 	 * a page is 4KB so we have 12 bits offset, minimum 9 bits in the
-	 * page table and the remaining bits are in the page directory */
+	 * page table and the remaining bits are in the page directory
+	 */
 	if (amdgpu_vm_block_size == -1)
 		return;
 
@@ -3265,7 +3266,7 @@ static int amdgpu_device_ip_resume_phase2(struct amdgpu_device *adev)
  *
  * Main resume function for hardware IPs.  The hardware IPs
  * are split into two resume functions because they are
- * are also used in in recovering from a GPU reset and some additional
+ * also used in recovering from a GPU reset and some additional
  * steps need to be take between them.  In this case (S3/S4) they are
  * run sequentially.
  * Returns 0 on success, negative error code on failure.
@@ -3367,8 +3368,7 @@ bool amdgpu_device_asic_has_dc_support(enum amd_asic_type asic_type)
 #else
 	default:
 		if (amdgpu_dc > 0)
-			DRM_INFO_ONCE("Display Core has been requested via kernel parameter "
-					 "but isn't supported by ASIC, ignoring\n");
+			DRM_INFO_ONCE("Display Core has been requested via kernel parameter but isn't supported by ASIC, ignoring\n");
 		return false;
 #endif
 	}
@@ -3616,7 +3616,8 @@ int amdgpu_device_init(struct amdgpu_device *adev,
 		 pdev->subsystem_vendor, pdev->subsystem_device, pdev->revision);
 
 	/* mutex initialization are all done here so we
-	 * can recall function without having locking issues */
+	 * can recall function without having locking issues
+	 */
 	mutex_init(&adev->firmware.mutex);
 	mutex_init(&adev->pm.mutex);
 	mutex_init(&adev->gfx.gpu_clock_mutex);
@@ -3693,11 +3694,11 @@ int amdgpu_device_init(struct amdgpu_device *adev,
 		atomic_set(&adev->pm.pwr_state[i], POWER_STATE_UNKNOWN);
 
 	adev->rmmio = ioremap(adev->rmmio_base, adev->rmmio_size);
-	if (adev->rmmio == NULL) {
+	if (!adev->rmmio)
 		return -ENOMEM;
-	}
+
 	DRM_INFO("register mmio base: 0x%08X\n", (uint32_t)adev->rmmio_base);
-	DRM_INFO("register mmio size: %u\n", (unsigned)adev->rmmio_size);
+	DRM_INFO("register mmio size: %u\n", (unsigned int)adev->rmmio_size);
 
 	/*
 	 * Reset domain needs to be present early, before XGMI hive discovered
@@ -3951,7 +3952,8 @@ int amdgpu_device_init(struct amdgpu_device *adev,
 
 	/* if we have > 1 VGA cards, then disable the amdgpu VGA resources */
 	/* this will fail for cards that aren't VGA class devices, just
-	 * ignore it */
+	 * ignore it
+	 */
 	if ((adev->pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
 		vga_client_register(adev->pdev, amdgpu_device_vga_set_decode);
 
@@ -4034,7 +4036,7 @@ void amdgpu_device_fini_hw(struct amdgpu_device *adev)
 
 	/* make sure IB test finished before entering exclusive mode
 	 * to avoid preemption on IB test
-	 * */
+	 */
 	if (amdgpu_sriov_vf(adev)) {
 		amdgpu_virt_request_full_gpu(adev, false);
 		amdgpu_virt_fini_data_exchange(adev);
@@ -4771,8 +4773,9 @@ int amdgpu_device_pre_asic_reset(struct amdgpu_device *adev,
 		if (!ring || !ring->sched.thread)
 			continue;
 
-		/*clear job fence from fence drv to avoid force_completion
-		 *leave NULL and vm flush fence in fence drv */
+		/* Clear job fence from fence drv to avoid force_completion
+		 * leave NULL and vm flush fence in fence drv
+		 */
 		amdgpu_fence_driver_clear_job_fences(ring);
 
 		/* after all hw jobs are reset, hw fence is meaningless, so force_completion */
@@ -4786,7 +4789,7 @@ int amdgpu_device_pre_asic_reset(struct amdgpu_device *adev,
 
 	r = amdgpu_reset_prepare_hwcontext(adev, reset_context);
 	/* If reset handler not implemented, continue; otherwise return */
-	if (r == -ENOSYS)
+	if (r == -EOPNOTSUPP)
 		r = 0;
 	else
 		return r;
@@ -4904,7 +4907,7 @@ int amdgpu_do_asic_reset(struct list_head *device_list_handle,
 	reset_context->reset_device_list = device_list_handle;
 	r = amdgpu_reset_perform_reset(tmp_adev, reset_context);
 	/* If reset handler not implemented, continue; otherwise return */
-	if (r == -ENOSYS)
+	if (r == -EOPNOTSUPP)
 		r = 0;
 	else
 		return r;
@@ -5393,9 +5396,8 @@ int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
 		if (adev->enable_mes && adev->ip_versions[GC_HWIP][0] != IP_VERSION(11, 0, 3))
 			amdgpu_mes_self_test(tmp_adev);
 
-		if (!drm_drv_uses_atomic_modeset(adev_to_drm(tmp_adev)) && !job_signaled) {
+		if (!drm_drv_uses_atomic_modeset(adev_to_drm(tmp_adev)) && !job_signaled)
 			drm_helper_resume_force_mode(adev_to_drm(tmp_adev));
-		}
 
 		if (tmp_adev->asic_reset_res)
 			r = tmp_adev->asic_reset_res;

drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c

@@ -87,7 +87,7 @@ int amdgpu_reset_prepare_hwcontext(struct amdgpu_device *adev,
 		reset_handler = adev->reset_cntl->get_reset_handler(
 			adev->reset_cntl, reset_context);
 	if (!reset_handler)
-		return -ENOSYS;
+		return -EOPNOTSUPP;
 
 	return reset_handler->prepare_hwcontext(adev->reset_cntl,
 						reset_context);
@@ -103,7 +103,7 @@ int amdgpu_reset_perform_reset(struct amdgpu_device *adev,
 		reset_handler = adev->reset_cntl->get_reset_handler(
 			adev->reset_cntl, reset_context);
 	if (!reset_handler)
-		return -ENOSYS;
+		return -EOPNOTSUPP;
 
 	ret = reset_handler->perform_reset(adev->reset_cntl, reset_context);
 	if (ret)