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ae358dacd2
It's only used to protect our page list, and only when we know we have a full reference. This means none of these code paths can ever race with the final unref, and hence we do not need dev->struct_mutex serialization and can simply switch to our own locking. For more context the only magic the locked gem_free_object provides is that it prevents concurrent final unref (and destruction) of gem objects while anyone is holding dev->struct_mutex. This was used by i915 (and other drivers) to implement eviction handling with less headaches. Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Cc: Dave Airlie <airlied@redhat.com> Reviewed-by: Sean Paul <seanpaul@chromium.org> Link: https://patchwork.freedesktop.org/patch/msgid/20180327082356.24516-3-daniel.vetter@ffwll.ch
157 lines
4.7 KiB
C
157 lines
4.7 KiB
C
/*
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* Copyright (C) 2012 Red Hat
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*
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* based in parts on udlfb.c:
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* Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
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* Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
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* Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License v2. See the file COPYING in the main directory of this archive for
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* more details.
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*/
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#ifndef UDL_DRV_H
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#define UDL_DRV_H
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#include <linux/usb.h>
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#include <drm/drm_gem.h>
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#define DRIVER_NAME "udl"
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#define DRIVER_DESC "DisplayLink"
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#define DRIVER_DATE "20120220"
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#define DRIVER_MAJOR 0
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#define DRIVER_MINOR 0
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#define DRIVER_PATCHLEVEL 1
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#define UDL_BO_CACHEABLE (1 << 0)
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#define UDL_BO_WC (1 << 1)
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struct udl_device;
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struct urb_node {
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struct list_head entry;
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struct udl_device *dev;
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struct delayed_work release_urb_work;
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struct urb *urb;
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};
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struct urb_list {
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struct list_head list;
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spinlock_t lock;
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struct semaphore limit_sem;
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int available;
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int count;
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size_t size;
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};
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struct udl_fbdev;
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struct udl_device {
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struct device *dev;
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struct drm_device *ddev;
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struct usb_device *udev;
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struct drm_crtc *crtc;
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struct mutex gem_lock;
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int sku_pixel_limit;
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struct urb_list urbs;
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atomic_t lost_pixels; /* 1 = a render op failed. Need screen refresh */
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struct udl_fbdev *fbdev;
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char mode_buf[1024];
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uint32_t mode_buf_len;
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atomic_t bytes_rendered; /* raw pixel-bytes driver asked to render */
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atomic_t bytes_identical; /* saved effort with backbuffer comparison */
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atomic_t bytes_sent; /* to usb, after compression including overhead */
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atomic_t cpu_kcycles_used; /* transpired during pixel processing */
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};
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struct udl_gem_object {
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struct drm_gem_object base;
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struct page **pages;
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void *vmapping;
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struct sg_table *sg;
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unsigned int flags;
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};
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#define to_udl_bo(x) container_of(x, struct udl_gem_object, base)
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struct udl_framebuffer {
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struct drm_framebuffer base;
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struct udl_gem_object *obj;
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bool active_16; /* active on the 16-bit channel */
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};
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#define to_udl_fb(x) container_of(x, struct udl_framebuffer, base)
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/* modeset */
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int udl_modeset_init(struct drm_device *dev);
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void udl_modeset_restore(struct drm_device *dev);
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void udl_modeset_cleanup(struct drm_device *dev);
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int udl_connector_init(struct drm_device *dev, struct drm_encoder *encoder);
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struct drm_encoder *udl_encoder_init(struct drm_device *dev);
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struct urb *udl_get_urb(struct drm_device *dev);
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int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len);
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void udl_urb_completion(struct urb *urb);
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int udl_driver_load(struct drm_device *dev, unsigned long flags);
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void udl_driver_unload(struct drm_device *dev);
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int udl_fbdev_init(struct drm_device *dev);
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void udl_fbdev_cleanup(struct drm_device *dev);
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void udl_fbdev_unplug(struct drm_device *dev);
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struct drm_framebuffer *
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udl_fb_user_fb_create(struct drm_device *dev,
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struct drm_file *file,
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const struct drm_mode_fb_cmd2 *mode_cmd);
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int udl_render_hline(struct drm_device *dev, int bpp, struct urb **urb_ptr,
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const char *front, char **urb_buf_ptr,
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u32 byte_offset, u32 device_byte_offset, u32 byte_width,
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int *ident_ptr, int *sent_ptr);
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int udl_dumb_create(struct drm_file *file_priv,
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struct drm_device *dev,
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struct drm_mode_create_dumb *args);
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int udl_gem_mmap(struct drm_file *file_priv, struct drm_device *dev,
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uint32_t handle, uint64_t *offset);
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void udl_gem_free_object(struct drm_gem_object *gem_obj);
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struct udl_gem_object *udl_gem_alloc_object(struct drm_device *dev,
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size_t size);
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struct dma_buf *udl_gem_prime_export(struct drm_device *dev,
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struct drm_gem_object *obj, int flags);
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struct drm_gem_object *udl_gem_prime_import(struct drm_device *dev,
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struct dma_buf *dma_buf);
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int udl_gem_get_pages(struct udl_gem_object *obj);
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void udl_gem_put_pages(struct udl_gem_object *obj);
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int udl_gem_vmap(struct udl_gem_object *obj);
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void udl_gem_vunmap(struct udl_gem_object *obj);
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int udl_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
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int udl_gem_fault(struct vm_fault *vmf);
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int udl_handle_damage(struct udl_framebuffer *fb, int x, int y,
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int width, int height);
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int udl_drop_usb(struct drm_device *dev);
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#define CMD_WRITE_RAW8 "\xAF\x60" /**< 8 bit raw write command. */
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#define CMD_WRITE_RL8 "\xAF\x61" /**< 8 bit run length command. */
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#define CMD_WRITE_COPY8 "\xAF\x62" /**< 8 bit copy command. */
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#define CMD_WRITE_RLX8 "\xAF\x63" /**< 8 bit extended run length command. */
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#define CMD_WRITE_RAW16 "\xAF\x68" /**< 16 bit raw write command. */
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#define CMD_WRITE_RL16 "\xAF\x69" /**< 16 bit run length command. */
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#define CMD_WRITE_COPY16 "\xAF\x6A" /**< 16 bit copy command. */
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#define CMD_WRITE_RLX16 "\xAF\x6B" /**< 16 bit extended run length command. */
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#endif
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