--- /dev/null
+/*
+ * Copyright 1993-2003 NVIDIA, Corporation
+ * Copyright 2007-2009 Stuart Bennett
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+ * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <drm/drmP.h>
+
+#include "nouveau_drm.h"
+#include "nouveau_reg.h"
+#include "hw.h"
+
+/****************************************************************************\
+* *
+* The video arbitration routines calculate some "magic" numbers. Fixes *
+* the snow seen when accessing the framebuffer without it. *
+* It just works (I hope). *
+* *
+\****************************************************************************/
+
+struct nv_fifo_info {
+ int lwm;
+ int burst;
+};
+
+struct nv_sim_state {
+ int pclk_khz;
+ int mclk_khz;
+ int nvclk_khz;
+ int bpp;
+ int mem_page_miss;
+ int mem_latency;
+ int memory_type;
+ int memory_width;
+ int two_heads;
+};
+
+static void
+nv04_calc_arb(struct nv_fifo_info *fifo, struct nv_sim_state *arb)
+{
+ int pagemiss, cas, width, bpp;
+ int nvclks, mclks, pclks, crtpagemiss;
+ int found, mclk_extra, mclk_loop, cbs, m1, p1;
+ int mclk_freq, pclk_freq, nvclk_freq;
+ int us_m, us_n, us_p, crtc_drain_rate;
+ int cpm_us, us_crt, clwm;
+
+ pclk_freq = arb->pclk_khz;
+ mclk_freq = arb->mclk_khz;
+ nvclk_freq = arb->nvclk_khz;
+ pagemiss = arb->mem_page_miss;
+ cas = arb->mem_latency;
+ width = arb->memory_width >> 6;
+ bpp = arb->bpp;
+ cbs = 128;
+
+ pclks = 2;
+ nvclks = 10;
+ mclks = 13 + cas;
+ mclk_extra = 3;
+ found = 0;
+
+ while (!found) {
+ found = 1;
+
+ mclk_loop = mclks + mclk_extra;
+ us_m = mclk_loop * 1000 * 1000 / mclk_freq;
+ us_n = nvclks * 1000 * 1000 / nvclk_freq;
+ us_p = nvclks * 1000 * 1000 / pclk_freq;
+
+ crtc_drain_rate = pclk_freq * bpp / 8;
+ crtpagemiss = 2;
+ crtpagemiss += 1;
+ cpm_us = crtpagemiss * pagemiss * 1000 * 1000 / mclk_freq;
+ us_crt = cpm_us + us_m + us_n + us_p;
+ clwm = us_crt * crtc_drain_rate / (1000 * 1000);
+ clwm++;
+
+ m1 = clwm + cbs - 512;
+ p1 = m1 * pclk_freq / mclk_freq;
+ p1 = p1 * bpp / 8;
+ if ((p1 < m1 && m1 > 0) || clwm > 519) {
+ found = !mclk_extra;
+ mclk_extra--;
+ }
+ if (clwm < 384)
+ clwm = 384;
+
+ fifo->lwm = clwm;
+ fifo->burst = cbs;
+ }
+}
+
+static void
+nv10_calc_arb(struct nv_fifo_info *fifo, struct nv_sim_state *arb)
+{
+ int fill_rate, drain_rate;
+ int pclks, nvclks, mclks, xclks;
+ int pclk_freq, nvclk_freq, mclk_freq;
+ int fill_lat, extra_lat;
+ int max_burst_o, max_burst_l;
+ int fifo_len, min_lwm, max_lwm;
+ const int burst_lat = 80; /* Maximum allowable latency due
+ * to the CRTC FIFO burst. (ns) */
+
+ pclk_freq = arb->pclk_khz;
+ nvclk_freq = arb->nvclk_khz;
+ mclk_freq = arb->mclk_khz;
+
+ fill_rate = mclk_freq * arb->memory_width / 8; /* kB/s */
+ drain_rate = pclk_freq * arb->bpp / 8; /* kB/s */
+
+ fifo_len = arb->two_heads ? 1536 : 1024; /* B */
+
+ /* Fixed FIFO refill latency. */
+
+ pclks = 4; /* lwm detect. */
+
+ nvclks = 3 /* lwm -> sync. */
+ + 2 /* fbi bus cycles (1 req + 1 busy) */
+ + 1 /* 2 edge sync. may be very close to edge so
+ * just put one. */
+ + 1 /* fbi_d_rdv_n */
+ + 1 /* Fbi_d_rdata */
+ + 1; /* crtfifo load */
+
+ mclks = 1 /* 2 edge sync. may be very close to edge so
+ * just put one. */
+ + 1 /* arb_hp_req */
+ + 5 /* tiling pipeline */
+ + 2 /* latency fifo */
+ + 2 /* memory request to fbio block */
+ + 7; /* data returned from fbio block */
+
+ /* Need to accumulate 256 bits for read */
+ mclks += (arb->memory_type == 0 ? 2 : 1)
+ * arb->memory_width / 32;
+
+ fill_lat = mclks * 1000 * 1000 / mclk_freq /* minimum mclk latency */
+ + nvclks * 1000 * 1000 / nvclk_freq /* nvclk latency */
+ + pclks * 1000 * 1000 / pclk_freq; /* pclk latency */
+
+ /* Conditional FIFO refill latency. */
+
+ xclks = 2 * arb->mem_page_miss + mclks /* Extra latency due to
+ * the overlay. */
+ + 2 * arb->mem_page_miss /* Extra pagemiss latency. */
+ + (arb->bpp == 32 ? 8 : 4); /* Margin of error. */
+
+ extra_lat = xclks * 1000 * 1000 / mclk_freq;
+
+ if (arb->two_heads)
+ /* Account for another CRTC. */
+ extra_lat += fill_lat + extra_lat + burst_lat;
+
+ /* FIFO burst */
+
+ /* Max burst not leading to overflows. */
+ max_burst_o = (1 + fifo_len - extra_lat * drain_rate / (1000 * 1000))
+ * (fill_rate / 1000) / ((fill_rate - drain_rate) / 1000);
+ fifo->burst = min(max_burst_o, 1024);
+
+ /* Max burst value with an acceptable latency. */
+ max_burst_l = burst_lat * fill_rate / (1000 * 1000);
+ fifo->burst = min(max_burst_l, fifo->burst);
+
+ fifo->burst = rounddown_pow_of_two(fifo->burst);
+
+ /* FIFO low watermark */
+
+ min_lwm = (fill_lat + extra_lat) * drain_rate / (1000 * 1000) + 1;
+ max_lwm = fifo_len - fifo->burst
+ + fill_lat * drain_rate / (1000 * 1000)
+ + fifo->burst * drain_rate / fill_rate;
+
+ fifo->lwm = min_lwm + 10 * (max_lwm - min_lwm) / 100; /* Empirical. */
+}
+
+static void
+nv04_update_arb(struct drm_device *dev, int VClk, int bpp,
+ int *burst, int *lwm)
+{
+ struct nouveau_drm *drm = nouveau_drm(dev);
+ struct nvif_device *device = &nouveau_drm(dev)->device;
+ struct nv_fifo_info fifo_data;
+ struct nv_sim_state sim_data;
+ int MClk = nouveau_hw_get_clock(dev, PLL_MEMORY);
+ int NVClk = nouveau_hw_get_clock(dev, PLL_CORE);
+ uint32_t cfg1 = nvif_rd32(device, NV04_PFB_CFG1);
+
+ sim_data.pclk_khz = VClk;
+ sim_data.mclk_khz = MClk;
+ sim_data.nvclk_khz = NVClk;
+ sim_data.bpp = bpp;
+ sim_data.two_heads = nv_two_heads(dev);
+ if ((dev->pdev->device & 0xffff) == 0x01a0 /*CHIPSET_NFORCE*/ ||
+ (dev->pdev->device & 0xffff) == 0x01f0 /*CHIPSET_NFORCE2*/) {
+ uint32_t type;
+
+ pci_read_config_dword(pci_get_bus_and_slot(0, 1), 0x7c, &type);
+
+ sim_data.memory_type = (type >> 12) & 1;
+ sim_data.memory_width = 64;
+ sim_data.mem_latency = 3;
+ sim_data.mem_page_miss = 10;
+ } else {
+ sim_data.memory_type = nvif_rd32(device, NV04_PFB_CFG0) & 0x1;
+ sim_data.memory_width = (nvif_rd32(device, NV_PEXTDEV_BOOT_0) & 0x10) ? 128 : 64;
+ sim_data.mem_latency = cfg1 & 0xf;
+ sim_data.mem_page_miss = ((cfg1 >> 4) & 0xf) + ((cfg1 >> 31) & 0x1);
+ }
+
+ if (drm->device.info.family == NV_DEVICE_INFO_V0_TNT)
+ nv04_calc_arb(&fifo_data, &sim_data);
+ else
+ nv10_calc_arb(&fifo_data, &sim_data);
+
+ *burst = ilog2(fifo_data.burst >> 4);
+ *lwm = fifo_data.lwm >> 3;
+}
+
+static void
+nv20_update_arb(int *burst, int *lwm)
+{
+ unsigned int fifo_size, burst_size, graphics_lwm;
+
+ fifo_size = 2048;
+ burst_size = 512;
+ graphics_lwm = fifo_size - burst_size;
+
+ *burst = ilog2(burst_size >> 5);
+ *lwm = graphics_lwm >> 3;
+}
+
+void
+nouveau_calc_arb(struct drm_device *dev, int vclk, int bpp, int *burst, int *lwm)
+{
+ struct nouveau_drm *drm = nouveau_drm(dev);
+
+ if (drm->device.info.family < NV_DEVICE_INFO_V0_KELVIN)
+ nv04_update_arb(dev, vclk, bpp, burst, lwm);
+ else if ((dev->pdev->device & 0xfff0) == 0x0240 /*CHIPSET_C51*/ ||
+ (dev->pdev->device & 0xfff0) == 0x03d0 /*CHIPSET_C512*/) {
+ *burst = 128;
+ *lwm = 0x0480;
+ } else
+ nv20_update_arb(burst, lwm);
+}
Code Review / kvmfornfv.git / blobdiff