Re: [PATCH] drm/amdgpu: Fix ENOSYS means 'invalid syscall nr' in amdgpu_device.c

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On 7/23/2023 11:45 AM, Srinivasan Shanmugam wrote:
ENOSYS should be used for nonexistent syscalls only, replace ENOSYS with
EINVAL & other style fixes

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

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

Cc: Christian König <christian.koenig@xxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@xxxxxxx>
---
  drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 60 +++++++++++-----------
  drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c  |  4 +-
  2 files changed, 33 insertions(+), 31 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 1c786190a84e..ec166c797b9a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/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;
@@ -1620,7 +1621,7 @@ static bool amdgpu_switcheroo_can_switch(struct pci_dev *pdev)
  {
  	struct drm_device *dev = pci_get_drvdata(pdev);
- /*
+       /*
  	* FIXME: open_count is protected by drm_global_mutex but that would lead to
  	* locking inversion with the driver load path. And the access here is
  	* completely racy anyway. So don't bother with locking for now.
@@ -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 == -EINVAL)
ENOSYS is defined as /* Function not implemented */ on some platforms.

If not for ENOSYS, please use ENOTSUPP here instead.

  		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 == -EINVAL)

Please use ENOTSUPP instead.

  		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;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c
index eec41ad30406..12515e40b693 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c
+++ b/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 -EINVAL;

Please use ENOTSUPP instead.

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 -EINVAL;

Please use ENOTSUPP instead.

Thanks,
Lijo
ret = reset_handler->perform_reset(adev->reset_cntl, reset_context);
  	if (ret)



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