![Lyude Paul](/assets/img/avatar_default.png)
Every codepath in nouveau that loops through the connector list currently does so using the old method, which is prone to race conditions from MST connectors being created and destroyed. This has been causing a multitude of problems, including memory corruption from trying to access connectors that have already been freed! Signed-off-by: Lyude Paul <lyude@redhat.com> Cc: stable@vger.kernel.org Cc: Karol Herbst <karolherbst@gmail.com> Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
330 lines
9 KiB
C
330 lines
9 KiB
C
/*
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* Copyright (C) 2009 Red Hat <mjg@redhat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial
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* portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*/
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/*
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* Authors:
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* Matthew Garrett <mjg@redhat.com>
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*
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* Register locations derived from NVClock by Roderick Colenbrander
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*/
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#include <linux/apple-gmux.h>
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#include <linux/backlight.h>
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#include <linux/idr.h>
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#include "nouveau_drv.h"
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#include "nouveau_reg.h"
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#include "nouveau_encoder.h"
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static struct ida bl_ida;
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#define BL_NAME_SIZE 15 // 12 for name + 2 for digits + 1 for '\0'
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struct backlight_connector {
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struct list_head head;
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int id;
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};
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static bool
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nouveau_get_backlight_name(char backlight_name[BL_NAME_SIZE], struct backlight_connector
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*connector)
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{
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const int nb = ida_simple_get(&bl_ida, 0, 0, GFP_KERNEL);
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if (nb < 0 || nb >= 100)
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return false;
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if (nb > 0)
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snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight%d", nb);
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else
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snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight");
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connector->id = nb;
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return true;
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}
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static int
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nv40_get_intensity(struct backlight_device *bd)
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{
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struct nouveau_drm *drm = bl_get_data(bd);
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struct nvif_object *device = &drm->client.device.object;
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int val = (nvif_rd32(device, NV40_PMC_BACKLIGHT) &
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NV40_PMC_BACKLIGHT_MASK) >> 16;
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return val;
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}
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static int
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nv40_set_intensity(struct backlight_device *bd)
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{
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struct nouveau_drm *drm = bl_get_data(bd);
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struct nvif_object *device = &drm->client.device.object;
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int val = bd->props.brightness;
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int reg = nvif_rd32(device, NV40_PMC_BACKLIGHT);
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nvif_wr32(device, NV40_PMC_BACKLIGHT,
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(val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK));
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return 0;
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}
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static const struct backlight_ops nv40_bl_ops = {
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.options = BL_CORE_SUSPENDRESUME,
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.get_brightness = nv40_get_intensity,
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.update_status = nv40_set_intensity,
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};
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static int
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nv40_backlight_init(struct drm_connector *connector)
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{
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struct nouveau_drm *drm = nouveau_drm(connector->dev);
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struct nvif_object *device = &drm->client.device.object;
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struct backlight_properties props;
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struct backlight_device *bd;
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struct backlight_connector bl_connector;
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char backlight_name[BL_NAME_SIZE];
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if (!(nvif_rd32(device, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
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return 0;
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memset(&props, 0, sizeof(struct backlight_properties));
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props.type = BACKLIGHT_RAW;
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props.max_brightness = 31;
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if (!nouveau_get_backlight_name(backlight_name, &bl_connector)) {
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NV_ERROR(drm, "Failed to retrieve a unique name for the backlight interface\n");
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return 0;
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}
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bd = backlight_device_register(backlight_name , connector->kdev, drm,
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&nv40_bl_ops, &props);
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if (IS_ERR(bd)) {
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if (bl_connector.id > 0)
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ida_simple_remove(&bl_ida, bl_connector.id);
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return PTR_ERR(bd);
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}
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list_add(&bl_connector.head, &drm->bl_connectors);
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drm->backlight = bd;
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bd->props.brightness = nv40_get_intensity(bd);
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backlight_update_status(bd);
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return 0;
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}
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static int
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nv50_get_intensity(struct backlight_device *bd)
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{
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struct nouveau_encoder *nv_encoder = bl_get_data(bd);
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struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
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struct nvif_object *device = &drm->client.device.object;
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int or = ffs(nv_encoder->dcb->or) - 1;
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u32 div = 1025;
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u32 val;
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val = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
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val &= NV50_PDISP_SOR_PWM_CTL_VAL;
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return ((val * 100) + (div / 2)) / div;
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}
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static int
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nv50_set_intensity(struct backlight_device *bd)
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{
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struct nouveau_encoder *nv_encoder = bl_get_data(bd);
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struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
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struct nvif_object *device = &drm->client.device.object;
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int or = ffs(nv_encoder->dcb->or) - 1;
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u32 div = 1025;
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u32 val = (bd->props.brightness * div) / 100;
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nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or),
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NV50_PDISP_SOR_PWM_CTL_NEW | val);
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return 0;
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}
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static const struct backlight_ops nv50_bl_ops = {
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.options = BL_CORE_SUSPENDRESUME,
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.get_brightness = nv50_get_intensity,
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.update_status = nv50_set_intensity,
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};
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static int
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nva3_get_intensity(struct backlight_device *bd)
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{
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struct nouveau_encoder *nv_encoder = bl_get_data(bd);
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struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
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struct nvif_object *device = &drm->client.device.object;
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int or = ffs(nv_encoder->dcb->or) - 1;
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u32 div, val;
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div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
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val = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
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val &= NVA3_PDISP_SOR_PWM_CTL_VAL;
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if (div && div >= val)
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return ((val * 100) + (div / 2)) / div;
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return 100;
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}
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static int
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nva3_set_intensity(struct backlight_device *bd)
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{
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struct nouveau_encoder *nv_encoder = bl_get_data(bd);
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struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
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struct nvif_object *device = &drm->client.device.object;
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int or = ffs(nv_encoder->dcb->or) - 1;
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u32 div, val;
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div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
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val = (bd->props.brightness * div) / 100;
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if (div) {
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nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or), val |
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NV50_PDISP_SOR_PWM_CTL_NEW |
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NVA3_PDISP_SOR_PWM_CTL_UNK);
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return 0;
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}
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return -EINVAL;
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}
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static const struct backlight_ops nva3_bl_ops = {
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.options = BL_CORE_SUSPENDRESUME,
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.get_brightness = nva3_get_intensity,
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.update_status = nva3_set_intensity,
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};
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static int
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nv50_backlight_init(struct drm_connector *connector)
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{
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struct nouveau_drm *drm = nouveau_drm(connector->dev);
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struct nvif_object *device = &drm->client.device.object;
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struct nouveau_encoder *nv_encoder;
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struct backlight_properties props;
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struct backlight_device *bd;
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const struct backlight_ops *ops;
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struct backlight_connector bl_connector;
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char backlight_name[BL_NAME_SIZE];
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nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS);
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if (!nv_encoder) {
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nv_encoder = find_encoder(connector, DCB_OUTPUT_DP);
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if (!nv_encoder)
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return -ENODEV;
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}
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if (!nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(ffs(nv_encoder->dcb->or) - 1)))
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return 0;
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if (drm->client.device.info.chipset <= 0xa0 ||
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drm->client.device.info.chipset == 0xaa ||
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drm->client.device.info.chipset == 0xac)
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ops = &nv50_bl_ops;
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else
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ops = &nva3_bl_ops;
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memset(&props, 0, sizeof(struct backlight_properties));
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props.type = BACKLIGHT_RAW;
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props.max_brightness = 100;
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if (!nouveau_get_backlight_name(backlight_name, &bl_connector)) {
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NV_ERROR(drm, "Failed to retrieve a unique name for the backlight interface\n");
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return 0;
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}
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bd = backlight_device_register(backlight_name , connector->kdev,
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nv_encoder, ops, &props);
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if (IS_ERR(bd)) {
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if (bl_connector.id > 0)
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ida_simple_remove(&bl_ida, bl_connector.id);
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return PTR_ERR(bd);
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}
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list_add(&bl_connector.head, &drm->bl_connectors);
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drm->backlight = bd;
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bd->props.brightness = bd->ops->get_brightness(bd);
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backlight_update_status(bd);
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return 0;
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}
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int
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nouveau_backlight_init(struct drm_device *dev)
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{
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struct nouveau_drm *drm = nouveau_drm(dev);
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struct nvif_device *device = &drm->client.device;
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struct drm_connector *connector;
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struct drm_connector_list_iter conn_iter;
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INIT_LIST_HEAD(&drm->bl_connectors);
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if (apple_gmux_present()) {
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NV_INFO(drm, "Apple GMUX detected: not registering Nouveau backlight interface\n");
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return 0;
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}
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drm_connector_list_iter_begin(dev, &conn_iter);
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drm_for_each_connector_iter(connector, &conn_iter) {
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if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS &&
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connector->connector_type != DRM_MODE_CONNECTOR_eDP)
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continue;
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switch (device->info.family) {
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case NV_DEVICE_INFO_V0_CURIE:
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return nv40_backlight_init(connector);
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case NV_DEVICE_INFO_V0_TESLA:
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case NV_DEVICE_INFO_V0_FERMI:
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case NV_DEVICE_INFO_V0_KEPLER:
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case NV_DEVICE_INFO_V0_MAXWELL:
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return nv50_backlight_init(connector);
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default:
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break;
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}
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}
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drm_connector_list_iter_end(&conn_iter);
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return 0;
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}
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void
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nouveau_backlight_exit(struct drm_device *dev)
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{
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struct nouveau_drm *drm = nouveau_drm(dev);
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struct backlight_connector *connector;
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list_for_each_entry(connector, &drm->bl_connectors, head) {
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if (connector->id >= 0)
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ida_simple_remove(&bl_ida, connector->id);
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}
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if (drm->backlight) {
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backlight_device_unregister(drm->backlight);
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drm->backlight = NULL;
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}
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}
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void
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nouveau_backlight_ctor(void)
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{
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ida_init(&bl_ida);
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}
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void
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nouveau_backlight_dtor(void)
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{
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ida_destroy(&bl_ida);
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}
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