Re: [Intel-gfx] [PATCH v2 11/11] drm/i915: Extract i915_module.c

On Tue, Jul 27, 2021 at 02:10:37PM +0200, Daniel Vetter wrote:

The module init code is somewhat misplaced in i915_pci.c, since it needs to pull in init/exit functions from every part of the driver and pollutes the include list a lot.

Extract an i915_module.c file which pulls all the bits together, and allows us to massively trim the include list of i915_pci.c.

The downside is that have to drop the error path check Jason added to catch when we set up the pci driver too early. I think that risk is acceptable for this pretty nice include.

Cc: Jason Ekstrand jason@jlekstrand.net Cc: Tvrtko Ursulin tvrtko.ursulin@linux.intel.com Signed-off-by: Daniel Vetter daniel.vetter@intel.com Reviewed-by: Jason Ekstrand jason@jlekstrand.net

With gcc and CONFIG_GCC_PLUGIN_RANDSTRUCT=y, this patch results in:

drivers/gpu/drm/i915/i915_module.c:50:11: error: positional initialization of field in 'struct' declared with 'designated_init' attribute

This is seen for each of the initializers.

Guenter

---

drivers/gpu/drm/i915/Makefile | 1 + drivers/gpu/drm/i915/i915_module.c | 113 ++++++++++++++++++++++++++++ drivers/gpu/drm/i915/i915_pci.c | 117 +---------------------------- drivers/gpu/drm/i915/i915_pci.h | 8 ++ 4 files changed, 125 insertions(+), 114 deletions(-) create mode 100644 drivers/gpu/drm/i915/i915_module.c create mode 100644 drivers/gpu/drm/i915/i915_pci.h

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile index 9022dc638ed6..4ebd9f417ddb 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -38,6 +38,7 @@ i915-y += i915_drv.o \ i915_irq.o \ i915_getparam.o \ i915_mitigations.o \

•  i915_module.o \
  

  i915_params.o \ i915_pci.o \ i915_scatterlist.o \

diff --git a/drivers/gpu/drm/i915/i915_module.c b/drivers/gpu/drm/i915/i915_module.c new file mode 100644 index 000000000000..c578ea8f56a0 --- /dev/null +++ b/drivers/gpu/drm/i915/i915_module.c @@ -0,0 +1,113 @@ +/*

• • SPDX-License-Identifier: MIT
• • Copyright © 2021 Intel Corporation
• */

+#include <linux/console.h>

+#include "gem/i915_gem_context.h" +#include "gem/i915_gem_object.h" +#include "i915_active.h" +#include "i915_buddy.h" +#include "i915_params.h" +#include "i915_pci.h" +#include "i915_perf.h" +#include "i915_request.h" +#include "i915_scheduler.h" +#include "i915_selftest.h" +#include "i915_vma.h"

+static int i915_check_nomodeset(void) +{

• bool use_kms = true;
• /*

• * Enable KMS by default, unless explicitly overriden by
  

• * either the i915.modeset prarameter or by the
  

• * vga_text_mode_force boot option.
  

• */
  

• if (i915_modparams.modeset == 0)

• use_kms = false;
  

• if (vgacon_text_force() && i915_modparams.modeset == -1)

• use_kms = false;
  

• if (!use_kms) {

• /* Silently fail loading to not upset userspace. */
  

• DRM_DEBUG_DRIVER("KMS disabled.\n");
  

• return 1;
  

• }
• return 0;

+}

+static const struct {

• int (*init)(void);
• void (*exit)(void);

+} init_funcs[] = {

• { i915_check_nomodeset, NULL },
• { i915_active_module_init, i915_active_module_exit },
• { i915_buddy_module_init, i915_buddy_module_exit },
• { i915_context_module_init, i915_context_module_exit },
• { i915_gem_context_module_init, i915_gem_context_module_exit },
• { i915_objects_module_init, i915_objects_module_exit },
• { i915_request_module_init, i915_request_module_exit },
• { i915_scheduler_module_init, i915_scheduler_module_exit },
• { i915_vma_module_init, i915_vma_module_exit },
• { i915_mock_selftests, NULL },
• { i915_pmu_init, i915_pmu_exit },
• { i915_register_pci_driver, i915_unregister_pci_driver },
• { i915_perf_sysctl_register, i915_perf_sysctl_unregister },

+}; +static int init_progress;

+static int __init i915_init(void) +{

• int err, i;
• for (i = 0; i < ARRAY_SIZE(init_funcs); i++) {

• err = init_funcs[i].init();
  

• if (err < 0) {
  

• 	while (i--) {
  

• 		if (init_funcs[i].exit)
  

• 			init_funcs[i].exit();
  

• 	}
  

• 	return err;
  

• } else if (err > 0) {
  

• 	/*
  

• 	 * Early-exit success is reserved for things which
  

• 	 * don't have an exit() function because we have no
  

• 	 * idea how far they got or how to partially tear
  

• 	 * them down.
  

• 	 */
  

• 	WARN_ON(init_funcs[i].exit);
  

• 	break;
  

• }
  

• }
• init_progress = i;
• return 0;

+}

+static void __exit i915_exit(void) +{

• int i;
• for (i = init_progress - 1; i >= 0; i--) {

• GEM_BUG_ON(i >= ARRAY_SIZE(init_funcs));
  

• if (init_funcs[i].exit)
  

• 	init_funcs[i].exit();
  

• }

+}

+module_init(i915_init); +module_exit(i915_exit);

+MODULE_AUTHOR("Tungsten Graphics, Inc."); +MODULE_AUTHOR("Intel Corporation");

+MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL and additional rights"); diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c index b4f5e88aaae6..08651ca03478 100644 --- a/drivers/gpu/drm/i915/i915_pci.c +++ b/drivers/gpu/drm/i915/i915_pci.c @@ -22,24 +22,13 @@

*/

-#include <linux/console.h> #include <linux/vga_switcheroo.h>

#include <drm/drm_drv.h> #include <drm/i915_pciids.h>

-#include "display/intel_fbdev.h"

-#include "i915_active.h" -#include "i915_buddy.h" #include "i915_drv.h" -#include "gem/i915_gem_context.h" -#include "gem/i915_gem_object.h" -#include "i915_request.h" -#include "i915_perf.h" -#include "i915_selftest.h" -#include "i915_scheduler.h" -#include "i915_vma.h" +#include "i915_pci.h"

#define PLATFORM(x) .platform = (x) #define GEN(x) \ @@ -1251,31 +1240,6 @@ static void i915_pci_shutdown(struct pci_dev *pdev) i915_driver_shutdown(i915); }

-static int i915_check_nomodeset(void) -{

• bool use_kms = true;
• /*

• * Enable KMS by default, unless explicitly overriden by
  

• * either the i915.modeset prarameter or by the
  

• * vga_text_mode_force boot option.
  

• */
  

• if (i915_modparams.modeset == 0)

• use_kms = false;
  

• if (vgacon_text_force() && i915_modparams.modeset == -1)

• use_kms = false;
  

• if (!use_kms) {

• /* Silently fail loading to not upset userspace. */
  

• DRM_DEBUG_DRIVER("KMS disabled.\n");
  

• return 1;
  

• }
• return 0;

-}

static struct pci_driver i915_pci_driver = { .name = DRIVER_NAME, .id_table = pciidlist, @@ -1285,87 +1249,12 @@ static struct pci_driver i915_pci_driver = { .driver.pm = &i915_pm_ops, };

-static int i915_register_pci_driver(void) +int i915_register_pci_driver(void) { return pci_register_driver(&i915_pci_driver); }

-static void i915_unregister_pci_driver(void) +void i915_unregister_pci_driver(void) { pci_unregister_driver(&i915_pci_driver); }

-static const struct {

• int (*init)(void);
• void (*exit)(void);

-} init_funcs[] = {

• { i915_check_nomodeset, NULL },
• { i915_active_module_init, i915_active_module_exit },
• { i915_buddy_module_init, i915_buddy_module_exit },
• { i915_context_module_init, i915_context_module_exit },
• { i915_gem_context_module_init, i915_gem_context_module_exit },
• { i915_objects_module_init, i915_objects_module_exit },
• { i915_request_module_init, i915_request_module_exit },
• { i915_scheduler_module_init, i915_scheduler_module_exit },
• { i915_vma_module_init, i915_vma_module_exit },
• { i915_mock_selftests, NULL },
• { i915_pmu_init, i915_pmu_exit },
• { i915_register_pci_driver, i915_unregister_pci_driver },
• { i915_perf_sysctl_register, i915_perf_sysctl_unregister },

-}; -static int init_progress;

-static int __init i915_init(void) -{

• int err, i;
• for (i = 0; i < ARRAY_SIZE(init_funcs); i++) {

• err = init_funcs[i].init();
  

• if (err < 0) {
  

• 	while (i--) {
  

• 		if (init_funcs[i].exit)
  

• 			init_funcs[i].exit();
  

• 	}
  

• 	return err;
  

• } else if (err > 0) {
  

• 	/*
  

• 	 * Early-exit success is reserved for things which
  

• 	 * don't have an exit() function because we have no
  

• 	 * idea how far they got or how to partially tear
  

• 	 * them down.
  

• 	 */
  

• 	WARN_ON(init_funcs[i].exit);
  

• 	/*
  

• 	 * We don't want to advertise devices with an only
  

• 	 * partially initialized driver.
  

• 	 */
  

• 	WARN_ON(i915_pci_driver.driver.owner);
  

• 	break;
  

• }
  

• }
• init_progress = i;
• return 0;

-}

-static void __exit i915_exit(void) -{

• int i;
• for (i = init_progress - 1; i >= 0; i--) {

• GEM_BUG_ON(i >= ARRAY_SIZE(init_funcs));
  

• if (init_funcs[i].exit)
  

• 	init_funcs[i].exit();
  

• }

-}

-module_init(i915_init); -module_exit(i915_exit);

-MODULE_AUTHOR("Tungsten Graphics, Inc."); -MODULE_AUTHOR("Intel Corporation");

-MODULE_DESCRIPTION(DRIVER_DESC); -MODULE_LICENSE("GPL and additional rights"); diff --git a/drivers/gpu/drm/i915/i915_pci.h b/drivers/gpu/drm/i915/i915_pci.h new file mode 100644 index 000000000000..b386f319f52e --- /dev/null +++ b/drivers/gpu/drm/i915/i915_pci.h @@ -0,0 +1,8 @@ +/*

• • SPDX-License-Identifier: MIT
• • Copyright © 2021 Intel Corporation
• */

+int i915_register_pci_driver(void); +void i915_unregister_pci_driver(void);